Precast concrete beam dry-type connection node

Abstract

The utility model provides a prefabricated concrete beam dry type connection node, which belongs to the field of prefabricated buildings, and is characterized in that an upper high-strength bolt is arranged above the top surface (within the height of a floor) of a prefabricated concrete beam so as to increase the connection arm of force of the upper high-strength bolt, so that equal-strength node connection with a steel bar in the beam is realized by utilizing a single large-diameter high-strength bolt; the installation convenience is greatly improved; the upper high-strength bolt and the lower high-strength bolt are combined for clamping, so that tensile and compression-resistant bidirectional force transmission is realized (in a normal state, the upper high-strength bolt is tensile, and the lower high-strength bolt is compression-resistant; ), so as to cope with the bending moment change of the precast concrete beam under the action of the reciprocating load.

Description

Technical Field

[0001] The utility model belongs to the field of prefabricated buildings, and particularly relates to a dry connection node of a precast concrete beam. Background Technique

[0002] In a precast concrete structure, the connection nodes between the beam and the building main body (such as columns or shear walls) all need to be cast in situ, resulting in the need for scaffolding during beam construction, slow node connection speed, and high cost. For example, Chinese Patent CN 108049633 A discloses a construction method for a precast concrete frame beam-column node, which involves the connection of precast columns and composite beams. Although it realizes a simple and rapid on-site connection between the precast columns and the composite beams, it does not get rid of the wet operation during the installation process of the beam-column, and steel bar connection is required, and the number of connections is relatively large.

[0003] In recent years, there have also been some practices of embedding steel sections at the beam ends of concrete beams and using bolt-welding connections. The exposed steel nodes need to be cast again, with a high steel consumption for the nodes and high requirements for workers in welding. And full-bolt connections have high requirements for accuracy. How to achieve full-bolt connections of beam-columns, especially rapid connections through a very small number of bolts, has always been a problem that engineering hopes to solve. Summary of the Utility Model

[0004] The purpose of the utility model is a rapid connection node of a concrete beam with full-bolt connection. For this reason, the utility model provides a dry connection node of a precast concrete beam, which includes a structural main body, a precast concrete beam, and an installation assembly. The precast concrete beam is assembled and connected to the structural main body through the installation assembly; it is characterized in that the installation assembly includes:

[0005] A first installation part, the first installation part at least includes an upper embedded sleeve, a lower embedded sleeve, and a support seat. The upper embedded sleeve and the lower embedded sleeve are embedded in the structural main body and are arranged vertically; the elevation of the upper embedded sleeve is higher than the top surface of the precast concrete beam, and the elevation of the lower embedded sleeve is higher than the bottom surface of the precast concrete beam; the support seat is arranged on the structural main body;

[0006] A second installation part, the second installation part at least includes 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, 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 embedded sleeve, and the upper high-strength bolt and the lower high-strength bolt pass through the second end plate and are correspondingly installed in the upper embedded sleeve and the lower embedded sleeve.

[0007] Preferably, a steel reinforcement cage is arranged in the precast concrete beam, and the steel reinforcement cage includes longitudinal bars and stirrups; the second end plate is connected to the longitudinal bars.

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

[0009] Preferably, the reinforcing diagonal brace is a triangular plate; one right-angle side of the triangular plate is connected to the extension section, and the other right-angle side is connected to the longitudinal bars; stirrups are provided at least near the triangular plate of the steel reinforcement cage.

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

[0011] Preferably, the number of the supporting seats is two; the two supporting seats are located on both sides of the second end plate, a butting port is formed on the side of the second end plate, and the supporting seats support the butting port.

[0012] Preferably, the second mounting member further includes a mounting box for mounting the lower high-strength bolts; the mounting box is arranged on the second end plate and embedded in the precast concrete beam, an installation chamber is provided inside the mounting box, an opening is provided at the bottom and corresponds to the bottom of the precast concrete beam, and the position on the side corresponds to the lower embedded sleeve.

[0013] Preferably, a post-filling adjustment gap is formed between the structural main body and the second end plate, and pressure-bearing adjustment nuts are provided on both the upper high-strength bolts and the lower high-strength bolts, and the pressure-bearing adjustment nuts are located in the post-filling adjustment gap.

[0014] Preferably, the first mounting member further includes a first end plate, the first end plate is fixed to the structural main body through embedded parts, and the supporting seats are arranged on the first end plate;

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

[0016] Preferably, the two precast concrete beams are connected to both sides of a structural main body; the upper high-strength bolts and the lower high-strength bolts respectively penetrate through the structural main body and are tensioned against the second end plates of the two precast concrete beams.

[0017] The technical effects produced by the above technical solutions of the present utility model come from the combination of one or more of the following:

[0018] The upper high-strength bolts are set above the top surface of the precast concrete beam (within the floor slab height) to increase the connection force arm of the upper high-strength bolts, thereby realizing a node connection with the same strength as the steel bars in the beam using a single large-diameter high-strength bolt, greatly improving the installation convenience; adopting high-strength bolt connection, its strength is greater than that of the steel bars, so that the bearing capacity of a single bolt is greater than the sum of the bearing capacities of all steel bars, and single-bolt connection of the upper and lower steel bars can be realized; and a support seat is set to resist shear, and combined with the clamping of the upper and lower high-strength bolts, bidirectional force transmission of tension and compression is realized (when the vertical load acts, the upper high-strength bolt resists tension and the lower high-strength bolt resists compression; when the seismic load acts, it may be the opposite) to cope with the moment sign change of the precast concrete beam under the reciprocating load.

[0019] The beam node connection is through bolt connection, with fast construction speed, no need for welding and low requirements for workers.

[0020] The shear resistance of the reinforcing diagonal brace is utilized to realize the installation of the beam without support, and the shear force at the beam end is connected by the reinforcing diagonal brace. The bolts do not need to bear the shear force, so that the bolts can have large holes to adjust the error and do not need to use pre-tightening force.

[0021] The double-bolt connection on both sides of the end makes the screw part capable of resisting both compression and tension, thus realizing that the connection between the beam and the main structure bears the negative moment under the action of the gravity load and can also withstand the positive moment that may be generated under the action of the seismic reciprocating load.

[0022] The traditional bolt connection scheme has poor ability to adjust the error in the length direction of the component. This node realizes the adjustment of the error caused by the inaccurate beam length through the bolts on both sides of the end plate, and the adjustable distance gap can be adjusted and filled later by the bearing adjustment nut.

[0023] The node connection does not require in-situ casting, nor does it require post-casting concrete to wrap. Only polymer mortar is needed for caulking and then filling the adjustable distance gap.

[0024] The steel consumption of the node is small and the cost is low.

[0025] The exposed connection of the upper high-strength bolts is convenient. After construction, they are buried by the in-situ cast part of the floor slab and do not expose. The lower high-strength bolts are set above the beam bottom height, and they can also be made not to expose after construction. Brief Description of the Drawings

[0026] Figure 1 Shows the structural schematic diagram of the present utility model.

[0027] Figure 2 Shows the front view of the present utility model.

[0028] Figure 3 Shows the assembly schematic diagram of a perspective of the present utility model.

[0029] Figure 4Shows another perspective assembly schematic diagram of the present utility model.

[0030] Figure 5 Shows the steel structure schematic diagram of the precast concrete beam in the present utility model.

[0031] Figure 6 Shows the steel structure assembly schematic diagram of the structural column and the precast concrete beam in the present utility model. Detailed implementation manners

[0032] The following description is given to enable those skilled in the art to implement and use the present utility model and incorporate it into a specific application background. Various variations, as well as various uses in different applications, will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to a wide range of embodiments. Thus, the present utility model is not limited to the embodiments given herein, but should be accorded the broadest scope consistent with the principles and novel features disclosed herein.

[0033] In the following detailed description, numerous specific details are set forth to provide a more thorough understanding of the present utility model. However, it will be apparent to those skilled in the art that the practice of the present utility model may not necessarily be limited to these specific details. In other words, well-known structures and devices are shown in block diagram form without detailed display to avoid obscuring the present utility model.

[0034] The reader is directed to all documents and literature that are filed simultaneously with this specification and that are open to public inspection of this specification, and the contents of all such documents and literature are incorporated herein by reference. Unless otherwise directly stated, all features disclosed in this specification (including any appended claims, abstract, and drawings) may be replaced by alternative features serving the same, equivalent, or similar purpose. Thus, unless otherwise expressly stated, each feature disclosed is only an example of a group of equivalent or similar features.

[0035] Note that, where used, the labels left, right, front, rear, top, bottom, positive, negative, clockwise, and counterclockwise are used solely for convenience and do not imply any specific fixed direction. In fact, they are used to reflect the relative positions and / or orientations between various parts of an object. Additionally, the terms "first" and "second" are used only for descriptive purposes and should not be construed as indicating or implying relative importance.

[0036] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0037] Note that in the case of use, "furthermore", "preferably", "even further", and "more preferably" are simply the starting points for elaborating another embodiment based on the foregoing embodiment. The content following the "furthermore", "preferably", "even further", or "more preferably" in combination with the foregoing embodiment constitutes the complete composition of another embodiment. The combinations of several "furthermore", "preferably", "even further", or "more preferably" settings following the same embodiment can form another embodiment arbitrarily.

[0038] The present utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments. Note that the aspects described below in conjunction with the accompanying drawings and specific embodiments are merely exemplary and should not be construed as imposing any limitation on the protection scope of the present utility model.

[0039] Please refer to Figures 1 to 6 , this embodiment provides a dry connection joint for precast concrete beams, including a structural main body, a precast concrete beam 2, and an installation assembly 3. The precast concrete beam 2 is assembled and connected to the structural main body through the installation assembly 3. Among them, the structural main body can be a structural column 1 or a shear wall. In this embodiment, the structural column 1 is taken as an object for detailed description.

[0040] Specifically, please refer to Figure 2 , Figure 3 and Figure 4, the installation component 3 includes a first installation piece and a second installation piece. Among them, the first installation piece at least includes 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 structural main body and are 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 structural main body; the second installation piece at least includes 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 by the support seat 312. The top of the second end plate 321 extends above the precast concrete beam 2 to form an extension section 3211 corresponding to the position of the upper embedded sleeve 313. The upper high-strength bolt 322 and the lower high-strength bolt 323 pass through the second end plate 321 and are correspondingly installed in 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 (within the floor height) to increase the connecting force arm of the upper high-strength bolt, so as to realize the 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 a support seat 312 is provided for shear resistance, and the upper and lower high-strength bolts are combined to clamp to realize the bidirectional force transfer of tension and compression (the upper high-strength bolt 322 resists tension and the lower high-strength bolt 323 resists compression under normal conditions; it may be the opposite during an earthquake) to cope with the change of bending moment of the precast concrete beam 2 under the action of reciprocating loads.

[0041] The above solutions constitute the necessity for the implementation of this embodiment, and the following will be described in detail with reference to the drawings:

[0042] Please combine Figure 3 , Figure 5 and Figure 6 , the precast concrete beam 2 is formed in the factory and installed by the method of hoisting on site. Further, a steel reinforcement cage is provided in the precast concrete beam 2. The steel reinforcement cage includes longitudinal bars 21 and stirrups 22. The second installation piece 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.

[0043] The top of the second end plate 321 extends upward to form an extension section 3211. Preferably, the extension section 3211 is an extension plate body and is regarded as a part of the second end plate 321. Generally speaking, it can be regarded that the height of the second end plate 321 is higher than that of the precast concrete beam 2, and the part above the top of the precast concrete beam 2 is defined as the extension section 3211, which is convenient for the description of the subsequent structure. The extension section 3211 is used as the installation component of the upper high-strength bolt, which increases the connecting force arm of the upper high-strength bolt. Therefore, the installation with the upper embedded sleeve 313 can be realized only by a single large-diameter high-strength bolt. The height of the extension section 3211 should be lower than the height of the floor slab. It is best to be submerged by the floor slab cast-in-place layer later to achieve the effect of hiding the upper high-strength bolt at the node.

[0044] Further, a reinforcing diagonal brace 325 is formed between the precast concrete beams 2. The reinforcing diagonal brace 325 is connected between the extension section 3211 and the longitudinal bars 21 to play a shear resistance role. Preferably, the reinforcing diagonal brace 325 is a triangular plate; one of the right-angled sides of the triangular plate is connected to the extension section 3211, and the other right-angled side is connected to the longitudinal bars 21. Here, both the extension section 3211 and the triangular plate are steel plates, and the connection method is welding. Further, the number of the reinforcing diagonal braces 325 is two, and the upper high-strength bolts 322 are located between the two reinforcing diagonal braces 325 to play a role in balanced support, tying and shear resistance. Preferably, a hoop 22 is directly arranged around the connection part of the triangular plate and the longitudinal bars 21. Through the bending-resistant joint composed of the hoop 22, the longitudinal bars 21 and the triangular plate, the high-strength bolts are prevented from pulling the second end plate 321, and the second end plate 321 will be bent, causing the longitudinal bars 21 to move upward. The hoop 22 is used to prevent deformation and displacement. Since the upper high-strength bolts 322 and the longitudinal bars 22 are not on the same axis, the axial force of the longitudinal bars 22 can be reliably transmitted through the reinforcing diagonal braces 325 and the hoop 22.

[0045] Further, in order to facilitate the pre-installation of the position of the precast concrete beam 2, in this embodiment, the number of the 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, a butting port 3212 is formed on the side of the second end plate 321, and the support seat 312 supports the butting port 3212. Preferably, the butting port 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 its right-angled sides is welded to the second end plate 321, and the other right-angled side forms a support part.

[0046] As another preferred embodiment of this embodiment, the support seat 312 can also be a bracket embedded and fixed to the main structure, and this embodiment is not limited to this.

[0047] In order to hide the lower high-strength bolts and facilitate installation; please refer to Figure 5 and Figure 6, the second mounting part also includes an installation box 34 for installing the lower high-strength bolt 323; the installation box 34 is arranged on the second end plate 321 and embedded in the precast concrete beam 2, and the installation box 34 has an installation chamber inside, the bottom has an opening and corresponds to the bottom of the precast concrete beam 2, and the position of the side corresponds to the lower embedded sleeve 314. Preferably, the installation 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 perforation position of the lower high-strength bolt in the second end plate 321, and the bottom opening corresponds to the bottom surface of the precast concrete beam 2, which is convenient for installation. As a result, the bottom of the second end plate 321, the bottom of the precast concrete beam 2 and the bottom opening of the installation 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 bolt hiding of the node is realized by cooperating with the hiding of the upper high-strength bolt mentioned above; on the other hand, it is also convenient for the subsequent ceiling installation at the bottom.

[0048] See also Figure 2 In actual installation, there may be a slight error between the beam installation spacing between the two structural bodies and the actual length of the beam. Therefore, a post-filling spacing adjustment gap 33 is formed between the first end plate 311 and the second end plate 321 to eliminate this error. Furthermore, a pressure-bearing adjustment nut 324 is provided on both the upper high-strength bolt 322 and the lower high-strength bolt 323, and the pressure-bearing adjustment nut 324 is located in the post-filling spacing adjustment gap 33. On the one hand, the spacing between the second end plate 321 and the structural body is adjusted by cooperating with the nut part of the high-strength bolt through the pressure-bearing adjustment nut 324; on the other hand, the second end plate 321 and the structural body clamping the pressure-bearing adjustment nut 324 also makes the pressure-bearing adjustment nut 324 play a role in bearing pressure, sharing the pull-out resistance of the upper high-strength bolt 322 and the compression resistance of the lower high-strength bolt 323.

[0049] The first mounting member also includes a first end plate 311, which is fixed to the main structure through an embedded member 315, and a support seat 312 is provided 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 member 315 is an embedded steel bar, one end of which is welded to the first end plate 311, and the whole is embedded in the structural column 1 and fixed. Furthermore, grooves adapted to the positioning of the upper embedded sleeve 313 and the lower embedded sleeve 314 are formed at the top and bottom of the first end plate 311, 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 when the structural column 1 is cast. The support seat 312 can be welded to the first end plate 311.

[0050] This embodiment can also be implemented for the installation of double-sided beams. Specifically, two precast concrete beams 2 are connected to both sides of the structural column 1. Among them, the upper high-strength bolt 322 and the lower high-strength bolt 323 respectively penetrate through the structural column 1 and are tensioned against the second end plates 321 of the two precast concrete beams 2. At this time, only one upper high-strength bolt 322 and one lower high-strength bolt 323 are required for the installation components 3 on both sides. Also, because it is a tension structure, the upper embedded sleeve 313 and the lower embedded sleeve 314 can be omitted.

[0051] Beneficial effects of this embodiment:

[0052] The upper high-strength bolt is arranged above the top surface of the precast concrete beam 2 (within the floor height) to increase the connecting force arm of the upper high-strength bolt, thereby realizing a node connection with equal strength to the steel bars in the beam using a single large-diameter high-strength bolt, greatly improving the installation convenience; and a support seat 312 is provided to resist shear, and the combination of clamping the upper and lower high-strength bolts realizes bidirectional force transmission of tension and compression (the upper high-strength bolt 322 resists tension and the lower high-strength bolt 323 resists compression under normal conditions; it may be the opposite during an earthquake) to cope with the change of bending moment sign of the precast concrete beam 2 under the action of reciprocating loads.

[0053] The beam node connection is through bolt connection, with fast construction speed, no need for welding, and low requirements for workers.

[0054] The shear resistance of the reinforcing diagonal brace 325 is utilized to realize the installation of the beam without support, and the shear force at the beam end is connected by the reinforcing diagonal brace 325. The bolt does not need to bear the shear force, so that the bolt can have a large hole to adjust the error and does not need to use pre-tightening force.

[0055] The double-bolt connection on both sides of the end makes the screw part capable of both resisting compression and tension, thus realizing that the connection between the beam and the structural main body bears the negative bending moment under the action of gravity load and can also withstand the positive bending moment that may occur under the action of earthquake reciprocating loads.

[0056] The traditional bolt connection scheme has poor error adjustment ability in the length direction of the component. This node realizes the adjustment of the error caused by the inaccurate beam length through the bolts on both sides of the end plate, and can adjust the distance adjustment gap 33 by the bearing adjustment nut 324.

[0057] The node connection does not require in-situ casting, nor does it require post-casting concrete wrapping. Only polymer mortar caulking and then filling the distance adjustment gap 33 are needed.

[0058] The steel consumption of the node is small and the cost is low.

[0059] Furthermore, the present utility model has been described in detail in combination with the accompanying drawings and embodiments. Those of ordinary skill in the art can make various variations of the present utility model according to the above description. Therefore, certain details in the embodiments should not constitute a limitation to the present utility model, and the protection scope of the present utility model will be defined by the scope defined in the appended claims.

Claims

1. A precast concrete beam dry connection node, comprising a structural body, a precast concrete beam and an installation component, wherein the precast concrete beam is assembled and connected to the structural body through the installation component; characterized in that: The installation assembly includes: A first mounting member, the first mounting member at least comprises an upper embedded sleeve, a lower embedded sleeve and a support seat, the upper embedded sleeve and the lower embedded sleeve are embedded in the structural main body and arranged vertically; the elevation of the upper embedded sleeve is higher than the top surface of the precast concrete beam, and the elevation of the lower embedded sleeve is higher than the bottom surface of the precast concrete beam; the support seat is arranged on the structural main body; The second mounting member at least includes 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, 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 position of the upper embedded sleeve, the upper high-strength bolt and the lower high-strength bolt pass through the second end plate and are correspondingly installed on the upper embedded sleeve and the lower embedded sleeve.

2. The precast concrete beam dry connection node according to claim 1, characterized in that: A steel cage is arranged inside the precast concrete beam, and the steel cage includes longitudinal bars and stirrups; the second end plate is connected to the longitudinal bars.

3. The precast concrete beam dry connection node according to claim 2, characterized in that: A reinforcing diagonal brace is formed between the extension section and the precast concrete beam, and the reinforcing diagonal brace is connected between the extension section and the longitudinal reinforcement.

4. The precast concrete beam dry connection node according to claim 3, characterized in that: The reinforcing diagonal brace is a triangular plate; one right-angle side of the triangular plate is connected to the extension section, and the other right-angle side is connected to the longitudinal reinforcement; the steel cage has stirrups at least near the triangular plate.

5. The precast concrete beam dry connection node according to claim 4, characterized in that: The number of the reinforcing diagonal braces is two, and the upper high-strength bolt is located between the two reinforcing diagonal braces.

6. The precast concrete beam dry connection node according to claim 1, characterized in that: The number of the support seats is two; the two support seats are located on both sides of the second end plate, and a lap joint is formed on the side of the second end plate, and the support seats are supported on the lap joint.

7. The precast concrete beam dry connection node according to claim 1, characterized in that: The second mounting member also includes an installation box for installing the lower high-strength bolt; the installation box is arranged on the second end plate and embedded in the precast concrete beam, and the installation box has an installation chamber inside, the bottom has an opening corresponding to the bottom of the precast concrete beam, and the position of the side corresponds to the lower embedded sleeve.

8. The precast concrete beam dry connection node according to claim 1, characterized in that: A post-filling distance adjustment gap is formed between the structural main body and the second end plate, and pressure-bearing adjustment nuts are provided on the upper high-strength bolts and the lower high-strength bolts, and the pressure-bearing adjustment nuts are located in the post-filling distance adjustment gap.

9. The precast concrete beam dry connection node according to claim 1, characterized in that: The first mounting member further comprises a first end plate, the first end plate is fixed to the structural body through an embedded member, and the support seat is arranged on the first end plate; The upper embedded sleeve is positioned at the top of the first end plate, and the lower embedded sleeve is positioned at the bottom of the first end plate.

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