Limited slip joint construction and method of construction of a joint construction

Abstract

The present application relates to the technical field of structural engineering and discloses a limited-slippage connecting structure and a construction method of the connecting structure. The limited-slippage connecting structure comprises a prefabricated plate, a concrete plate, a welding nail and a flexible sleeve. The concrete plate is arranged on the prefabricated plate, the welding nail is located in the concrete plate, the welding nail comprises a nail column and a nail head arranged at one end of the nail column, the other end of the nail column is connected with the prefabricated plate, and the flexible sleeve is sleeved on the nail column. The limited-slippage connecting structure can provide a proper slippage amount, effectively reduce the tensile stress of the concrete plate, and improve the long-term performance and durability of the concrete plate. At the same time, the limited-slippage connecting structure also has an anti-lifting effect to resist the separation and lifting of the concrete plate, reduce the sudden increase of the partial segment shear force caused by the excessive release of the combined effect, and improve the stress state of the transition section concrete plate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of structural engineering, and in particular, to a limited-slippage connecting structure and a construction method of the connecting structure. BACKGROUND

[0002] In a composite frame structure, a composite beam is composed of a steel beam and a concrete slab, which are usually connected by a stud connector. Under the action of external force, the composite frame structure will generate longitudinal shear, that is, the steel-concrete interface in the composite beam generates shear in the longitudinal direction of the member. In the general stress state, the longitudinal slip between the steel beam and the concrete slab is completely limited, which causes the concrete in the negative moment zone to be cracked under tension. In addition, during the long-term service of the composite frame structure, tensile stress will be generated in the concrete under the action of temperature change and shrinkage and creep, which cannot be released due to the limiting action of the stud, thereby reducing the long-term performance of the concrete.

[0003] In related technologies, in steel-concrete composite frame structures and concrete-concrete composite frame structures, how to provide a slip space to improve the crack resistance of the negative moment zone and reduce the sudden increase of shear in the connecting structure change section is an urgent problem to be solved. SUMMARY

[0004] The present application aims to at least partially solve one of the technical problems in the related art. To this end, an embodiment of the present application proposes a limited-slippage connecting structure and a construction method of the connecting structure, which can provide an appropriate slip amount, effectively reduce the tensile stress of the concrete slab, and improve the long-term performance and durability of the concrete slab. At the same time, the limited-slippage connecting structure also has an anti-lifting effect to resist the separation and lifting of the concrete slab, and reduces the sudden increase of the shear in the partial section caused by the excessive release of the composite effect, and improves the stress state of the transition section of the concrete slab.

[0005] The limited-slippage connecting structure of the present application comprises:

[0006] a precast slab;

[0007] a concrete slab provided on the precast slab;

[0008] a weld stud located in the concrete slab, the weld stud comprising a stud column and a stud head provided at one end of the stud column, the other end of the stud column being connected to the precast slab;

[0009] a flexible sleeve sleeved on the stud column.

[0010] According to the limited slip connection structure of the present application, the limited slip connection structure can provide appropriate slip amount, effectively reduce the tensile stress of the concrete slab, and improve the long-term performance and durability of the concrete slab. Meanwhile, the limited slip connection structure also has the effect of preventing lifting to resist the separation and lifting of the concrete slab, and reduces the sudden increase of the partial segment shear caused by the excessive release of the combined effect, and improves the stress state of the transition section of the concrete slab. In addition, the limited slip connection structure of the present application has the advantages of convenient material selection, simple structure, convenient construction, reasonable stress and good economic and technical benefits.

[0011] Optionally, the prefabricated slab is a steel slab.

[0012] Optionally, the prefabricated slab is a prefabricated concrete slab or a prefabricated concrete beam, and the prefabricated concrete slab or the prefabricated concrete beam is provided with a reserved hole matched with a part of the nail column.

[0013] Optionally, the flexible sleeve is provided with an opening penetrating the flexible sleeve in the thickness direction of the wall of the flexible sleeve, and the opening has a preset length in the length direction of the nail column.

[0014] Optionally, the wall surface of the opening includes a first side surface and a second side surface arranged oppositely in the circumferential direction of the flexible sleeve, a plurality of first protrusions protruding towards the second side surface are arranged on the first side surface, a plurality of second protrusions protruding towards the first side surface are arranged on the second side surface, and the plurality of first protrusions and the plurality of second protrusions are arranged alternately in the length direction of the nail column.

[0015] Optionally, the first protrusions and the second protrusions are both in the shape of sharp teeth; or

[0016] The first protrusions and the second protrusions are both in the shape of square teeth.

[0017] Optionally, the cross-sectional area of the end of the flexible sleeve away from the nail head gradually increases in the direction away from the nail head.

[0018] Optionally, the nail head is provided with a round corner or a chamfer on the side away from the nail column.

[0019] Optionally, the flexible sleeve is a plastic tube or a rubber tube.

[0020] Optionally, the other end of the nail column is provided with a spherical protrusion.

[0021] Optionally, the length direction of the nail column is parallel to the thickness direction of the concrete slab.

[0022] Optionally, the limited slip connection structure is applied to the negative bending moment area of the composite beam type member.

[0023] The construction method of the connecting structure of the present application, the connecting structure being the limited slip connecting structure described above, comprises:

[0024] According to the preset positions of the welding nails, the plurality of welding nails are connected to the prefabricated plate;

[0025] The flexible sleeve is further sleeved on the welding nails on the prefabricated plate;

[0026] The reinforcing steel bars are bound on the prefabricated plate, and the concrete is poured.

[0027] Optionally, the prefabricated plate is a steel plate, and the other end of the nail column of the welding nail is welded to the steel plate.

[0028] Optionally, the prefabricated plate is a prefabricated concrete plate or a prefabricated concrete beam, and the other end of the nail column of the welding nail is implanted into the reserved hole. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a schematic diagram of the limited slip connecting structure of the embodiment of the present application.

[0030] Figure 2 is another schematic diagram of the limited slip connecting structure of the embodiment of the present application.

[0031] Figure 3 is a schematic diagram of the cooperation of the welding nail and the flexible sleeve of the embodiment of the present application.

[0032] Figure 4 is another schematic diagram of the cooperation of the welding nail and the flexible sleeve of the embodiment of the present application.

[0033] Figure 5 is a schematic diagram of the nail head of the embodiment of the present application.

[0034] Figure 6 is another schematic diagram of the nail head of the embodiment of the present application.

[0035] Figure 7 is a schematic diagram of the composite beam type component of the embodiment of the present application.

[0036] Reference signs: 1-prefabricated plate, 11-steel plate, 12-prefabricated concrete plate, 13-prefabricated concrete beam, 2-concrete plate, 3-welding nail, 31-nail column, 32-nail head, 33-round corner, 34-chamfer, 4-flexible sleeve, 41-opening, 42-first side, 43-second side, 44-first protrusion, 45-second protrusion, a-reserved hole, A-composite beam type component, B-positive bending moment zone, C-negative bending moment zone. DETAILED DESCRIPTION

[0037] Embodiments of the present application are described in detail below with reference to the attached drawing figures, wherein the embodiments given herein are by way of illustration only and are not intended to be limiting of the present application.

[0038] A limited slip connection structure of an embodiment of the present application is described below with reference to the attached drawings. As shown in Figure 1 the limited slip connection structure of the present application includes a precast slab 1, a concrete slab 2, a weld pin 3, and a flexible sleeve 4, the concrete slab 2 is arranged on the precast slab 1, the weld pin 3 is located in the concrete slab 2, the weld pin 3 includes a pin column 31 and a pin head 32 arranged at one end of the pin column 31, the other end of the pin column 31 is connected with the precast slab 1, and the flexible sleeve 4 is sleeved on the pin column 31.

[0039] According to the limited slip connection structure of the present application, the limited slip connection structure can provide a proper slip amount, effectively reduce the tensile stress of the concrete slab 2, and improve the long-term performance and durability of the concrete slab 2. At the same time, the limited slip connection structure also has an anti-lifting effect to resist the separation and lifting of the concrete slab 3, and reduces the sudden increase of partial segment shear caused by the excessive release of the combined effect, and improves the stress state of the transition section concrete slab 2. In addition, the limited slip connection structure of the present application has the advantages of convenient material selection, simple structure, convenient construction, reasonable stress, and good economic and technical benefits.

[0040] As shown in Figures 1 to 7 in order to make the technical solution of the present application easier to be understood, the technical solution of the present application is described in more detail below with a specific embodiment of the limited slip connection structure.

[0041] The limited slip connection structure of the present application includes a precast slab 1, a concrete slab 2, a weld pin 3, and a flexible sleeve 4.

[0042] In some specific embodiments, as shown in Figure 1 the precast slab 1 can be a steel plate 11, the concrete slab 2 is located on the steel plate 11, the steel plate 11 and the concrete slab 2 are connected through the weld pin 3, and the weld pin 3 can connect the steel plate 11 and the concrete slab 2 together, so that the connection structure (combination of the steel plate 11 and the concrete slab 2) is more firm.

[0043] In some specific embodiments, as shown in Figure 2As shown, the prefabricated plate 1 is a prefabricated concrete plate 12 or a prefabricated concrete beam 13, and the prefabricated concrete plate 12 or the prefabricated concrete beam 13 is provided with a reserved hole a matched with the welding nail 3, so as to facilitate the implantation of the welding nail 3 and ensure that the welding nail 3 is more stable in connection with the prefabricated concrete plate 12 or the prefabricated concrete beam 13. At the same time, the prefabricated concrete plate 12 or the prefabricated concrete beam 13 is connected with the concrete plate 2 through the welding nail 3, so as to further make the prefabricated concrete plate 12 or the prefabricated concrete beam 13 and the concrete plate 2 more stable.

[0044] In some specific embodiments, as shown in Figures 1 to 6 As shown, the welding nail 3 includes a nail column 31 and a nail head 32 arranged at one end of the nail column 31, and the other end of the nail column 31 is connected with the prefabricated plate 1. The welding nail 3 is arranged in the concrete plate 2, that is, the nail head 32 is arranged in the concrete plate 2, and the nail head 32 has the function of preventing lifting, can resist the separation or lifting of the concrete plate 2 from the prefabricated plate 1, and reduce the sudden increase of partial segment shear force caused by excessive release of combination effect, and improve the stress state of the transition section of the concrete plate 2.

[0045] In some specific embodiments, the welding nail 3 is fixed on the steel plate 11 by welding.

[0046] In some specific embodiments, as shown in Figure 5 and Figure 6 As shown, the side of the nail head 32 away from the nail column 31 is provided with a round corner 33 or a chamfer 34, which can ensure that the flexible sleeve 4 is more smoothly sleeved on the welding nail 3, and can also prevent the nail head 32 from damaging the flexible sleeve 4.

[0047] In some specific embodiments, as shown in Figure 5 As shown, the round corner 33 on the nail head 32 is a reverse round corner.

[0048] In some specific embodiments, as shown in Figure 6 As shown, the chamfer 34 on the nail head 32 is a reverse angle, and the size of the chamfer is 5 mm.

[0049] In some specific embodiments, a spherical protrusion is arranged on the other end of the nail column 31. When the welding nail 3 is welded, the spherical protrusion facilitates the ignition of the welding point and is beneficial to the penetration welding.

[0050] In some specific embodiments, the diameter of the spherical protrusion on the welding nail 3 is 2-3 mm.

[0051] In some specific embodiments, as shown in Figure 6 As shown, the length direction of the nail column 31 is parallel to the thickness direction of the concrete plate.

[0052] In some specific embodiments, as shown in Figures 1 to 6As shown, the flexible sleeve 4 is sleeved on the nail column 31, and the flexible sleeve 4 can provide a flexible connection between the precast slab 1 and the concrete slab 2, provide a proper amount of slip between the precast slab 1 and the concrete slab 2, effectively reduce the tensile stress of the concrete slab 2, and improve the long-term performance and durability of the concrete slab 2. That is, when the precast slab 1 and the concrete slab 2 are simultaneously stressed, the concrete slab 2 can slide relative to the precast slab 1, avoiding excessive tensile stress on the concrete slab 2 and preventing damage to the concrete slab 2.

[0053] In some specific embodiments, as shown in Figures 1 to 4 As shown, the flexible sleeve 4 is provided with an opening 41 penetrating the flexible sleeve 4 in the thickness direction of the wall of the flexible sleeve 4, and the opening 41 has a preset length in the length direction of the nail column 31. The opening 41 can make the flexible sleeve 4 more conveniently sleeved on the weld nail 3.

[0054] In some specific embodiments, the preset length of the opening 41 can be less than the length of the flexible sleeve 4, and the opening 41 is located at one end of the flexible sleeve 4. The opening 41 can facilitate the flexible sleeve 4 to be sleeved on the weld nail 3.

[0055] Preferably, the preset length of the opening 41 is equal to the length of the flexible sleeve 4, that is, the opening 41 is equivalent to cutting the flexible sleeve 4.

[0056] In some specific embodiments, as shown in Figures 1 to 4 As shown, the wall surface of the opening 41 includes a first side surface 42 and a second side surface 43 oppositely arranged in the circumferential direction of the flexible sleeve 4, a plurality of first protrusions 44 protruding towards the second side surface 43 are arranged on the first side surface 42, a plurality of second protrusions 45 protruding towards the first side surface 41 are arranged on the second side surface 42, and the plurality of first protrusions 44 and the plurality of second protrusions 45 are arranged in sequence and staggered in the length direction of the nail column 31, which can prevent the flexible sleeve 4 located at the opening 41 from moving relative to each other.

[0057] In some specific embodiments, as shown in Figure 3 As shown, the first protrusions 44 and the second protrusions 45 are both in the shape of sharp teeth.

[0058] In some specific embodiments, as shown in Figure 4 As shown, the first protrusions 44 and the second protrusions 45 are both in the shape of square teeth.

[0059] In some specific embodiments, as shown in Figure 5 and Figure 6 As shown, the cross-sectional area of the end of the flexible sleeve 4 away from the nail head 32 gradually increases in the direction away from the nail head 32. That is, the end of the flexible sleeve 4 is in the shape of a horn, and the horn-shaped flexible sleeve 4 can be more conveniently sleeved on the weld nail 3.

[0060] In some specific embodiments, as shown in Figure 5 and Figure 6As shown, the flexible sleeve 4 is a plastic tube or a rubber tube.

[0061] In some embodiments, as shown, the limited slip connection structure is applied to the negative moment region C of the composite beam member A. The composite beam member A includes a positive moment region B and a negative moment region C. In addition, the connection structure has a certain longitudinal stiffness, allowing limited longitudinal slip, so that there is limited relative slip space on both sides of the interface of the composite beam member A, while also preventing the lifting of the concrete slab 2. Figure 7

[0062] The construction method of the connection structure of the present application, which is the limited slip connection structure described above, wherein the construction method comprises:

[0063] According to the preset position of the weld nail 3, connect multiple weld nails 3 to the prefabricated slab 1;

[0064] Then, the flexible sleeve 4 is sleeved on the weld nail 3 on the prefabricated slab 1;

[0065] The steel bars are tied on the prefabricated slab 1, and then the concrete is poured.

[0066] Specifically, the prefabricated slab 1 is a steel plate 11, and the other end of the nail column 31 of the weld nail 3 is welded to the steel plate 11. The weld nail 3 is welded to the steel plate 11 in the factory, and the steel plate 11 is installed in place on site, then the flexible sleeve 4 is wrapped around the weld nail 3, and finally the steel bars are tied on the steel plate 11 and the concrete is poured.

[0067] Wherein, the flexible sleeve 4 with the opening 41 can be wrapped around the weld nail 3 through the opening 41. Alternatively, the weld nail 3 with the flared opening can be wrapped around the weld nail 3 through the flared opening.

[0068] Specifically, the prefabricated slab 1 is a prefabricated concrete slab 12 or a prefabricated concrete beam 13, and the other end of the nail column 31 of the weld nail 3 is implanted in the reserved hole a. The weld nail 3 is implanted in the reserved hole a on the prefabricated concrete slab 12 or the prefabricated concrete beam 13 in the factory, and the prefabricated concrete slab 12 or the prefabricated concrete beam 13 is installed in place on site, then the flexible sleeve 4 is wrapped around the weld nail 3, and finally the steel bars are tied on the steel plate 11 and the concrete is poured.

[0069] Wherein, the flexible sleeve 4 with the opening 41 can be wrapped around the weld nail 3 through the opening 41. Alternatively, the weld nail 3 with the flared opening can be wrapped around the weld nail 3 through the flared opening.

[0070] The beneficial effects of the present application are as follows:

[0071] ​The flexible sleeve 4 can provide a slip amount adapted to the negative bending moment area C, effectively reduce the tensile stress of the concrete slab 2 in the negative bending moment area C under the action of the service load, temperature load and shrinkage and creep, and improve the long-term performance and durability of the concrete slab 2. At the same time, the nail head 32 of the stud 3 can effectively prevent the concrete slab 2 from being lifted in the interface normal direction of the composite beam type member A, and also allow the relative sliding between the concrete slab 2 and the prefabricated slab 1, effectively reduce the local shear force increase of the transition section caused by excessive release of the composite action, and improve the stress state of the concrete slab 2 in the transition section. In addition, the connecting structure of the present application is convenient to obtain materials, simple in structure, convenient for construction, reasonable in stress, and only needs to set the flexible sleeve 4 on site, which has good economic and technical benefits. In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0072] In addition, the terms "first", "second" are only for description purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0073] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected or can communicate with each other; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0074] In the present application, unless specifically stated and limited otherwise, a first feature "on" or "under" a second feature can be directly in contact with the second feature, or indirectly in contact with the second feature through an intermediate medium. Also, a first feature "over", "above" and "on top of" a second feature can be directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature "under", "below" and "underneath" a second feature can be directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0075] In the present application, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material or characteristic is included in at least one embodiment or example of the present application. Exemplary representations of the above terms in the present specification are not necessarily directed to the same embodiment or example. Also, the described specific features, structures, materials or characteristics can be combined in any suitable manner in any one or more embodiments or examples. In addition, different embodiments or examples described in the present specification and features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0076] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary, and are not to be construed as limiting the present application, and changes, modifications, replacements and variations of the above embodiments made by those skilled in the art are within the scope of the present application.

Claims

1. A connection structure with finite slippage, characterized in that, include: Precast slabs; A concrete slab, wherein the concrete slab is disposed on the precast slab; A welding stud, the welding stud being located within the concrete slab, the welding stud comprising a stud post and a stud head disposed at one end of the stud post, the other end of the stud post being connected to the precast slab; A flexible sleeve is fitted onto the nail post; The flexible sleeve has an opening that penetrates the flexible sleeve along its wall thickness direction, and the opening has a preset length in the length direction of the nail post. The wall surface of the opening includes a first side and a second side arranged opposite to each other in the circumferential direction of the flexible sleeve. The first side has a plurality of first protrusions that protrude toward the second side, and the second side has a plurality of second protrusions that protrude toward the first side. The plurality of first protrusions and the plurality of second protrusions are arranged alternately along the length direction of the nail post.

2. The connection structure with limited slippage according to claim 1, characterized in that, The precast slab is made of steel plate.

3. The connection structure with limited slippage according to claim 1, characterized in that, The precast slab is a precast concrete slab or a precast concrete beam, and the precast concrete slab or the precast concrete beam has reserved holes that cooperate with a part of the nail column.

4. The connection structure with limited slippage according to claim 1, characterized in that, Both the first protrusion and the second protrusion are serrated; or Both the first protrusion and the second protrusion are rectangular teeth.

5. The connection structure with limited slippage according to claim 1, characterized in that, The cross-sectional area of ​​the flexible sleeve at the end away from the nail head gradually increases in the direction away from the nail head.

6. The connection structure with limited slip according to claim 5, characterized in that, The nail head has a rounded or chamfered corner on the side away from the nail post.

7. The finite-slip connection structure according to any one of claims 1-6, characterized in that, The flexible sleeve is a plastic tube or a rubber tube.

8. The finite-slip connection structure according to any one of claims 1-6, characterized in that, The other end of the nail post is provided with a spherical protrusion.

9. The finite-slip connection structure according to any one of claims 1-6, characterized in that, The length direction of the nail post is parallel to the thickness direction of the concrete slab.

10. The finite-slip connection structure according to any one of claims 1-6, characterized in that, The finite slip connection structure is applied to the negative bending moment region of composite beam members.

11. A construction method for a connection structure, characterized in that, The connection structure is a limited sliding connection structure according to any one of claims 1-6, and the construction method includes: connecting a plurality of the welding studs to the precast slab according to the preset position of the welding studs; The flexible sleeve is then fitted onto the welding studs on the precast slab; Reinforcing bars are tied to the precast slab, and then concrete is poured.

12. The construction method of the connection structure according to claim 11, characterized in that, The precast slab is a steel plate, and the other end of the stud is welded to the steel plate.

13. The construction method of the connection structure according to claim 11, characterized in that, The precast slab is a precast concrete slab or a precast concrete beam, and the other end of the stud is inserted into the reserved hole.

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