A kind of free leveling layer and pipeline blocking-free laminated slab

Abstract

The application provides a kind of free to find level and no pipeline blocking laminated slab, comprising: prefabricated concrete layer, along first plane pouring is formed;The prefabricated concrete layer includes the first steel bar net laid along the first plane;At least one column of shear key components, at least part of each shear key component is embedded in the prefabricated concrete layer, the rest is from the surface of the prefabricated concrete layer in the first direction upwards to a certain height;The shear key component includes: the upper end in the first direction forms the first connecting end, and / or the lower end in the first direction forms the second connecting end;And at least one connecting rod;One connecting rod and the first connecting end or the second connecting end form detachable connection.The application can improve the efficiency of the whole process, including greatly improving the factory production efficiency, greatly improving the construction efficiency of the construction site, which embodies the industrial advantage of the application.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of building, and particularly relates to a composite slab without leveling layer and pipeline blocking. BACKGROUND

[0002] As an important symbol of the development of building technology, compared with the building constructed by cast-in-place construction method, the prefabricated building has great advantages in saving resources, reducing energy consumption, protecting the environment, and improving the quality of buildings. Part or most of the components of the prefabricated building are processed and manufactured in the factory, and then transported to the construction site for installation and construction. The construction method is more green and environmentally friendly than the traditional building construction method mainly based on cast-in-place concrete construction. The construction period is short and the efficiency is high. It can not only improve labor productivity, but also improve the overall quality of the building, reduce construction cost and material consumption and energy consumption. In the foreseeable future, and even in a longer period of time, prefabricated buildings will become the mainstream of the market and an important way to promote the modernization and industrialization of the construction industry.

[0003] The composite slab refers to the floor of a building divided into two parts along the thickness direction. The bottom is a prefabricated bottom plate or simply a prefabricated plate with bottom reinforcement, and the upper part is a cast-in-place reinforced concrete layer called cast-in-place slab. After long-term construction, the present inventors found that the existing composite slab construction method often has problems such as difficulty in laying pipelines, difficulty in leveling cast-in-place concrete, and excessive support scaffolding at the bottom. Specifically, because the truss height of the ordinary truss bar composite slab is generally not high, and the truss bar composite slab has been fixed during construction, it increases the difficulty of pipeline installation on the construction site. For example, the steel reinforcement area of the top truss bar is too small, and the stiffness is not large enough. For another example, the truss bar only plays a role when the component is hoisted, and becomes a burden after the cast-in-place layer is poured, which increases the steel content and cost of the composite slab.

[0004] Therefore, there is an urgent need for a composite slab without leveling layer and convenient pipeline installation to fill the technical gap in the prior art. SUMMARY

[0005] The purpose of the present application is to provide a composite slab without leveling layer and pipeline blocking. The composite slab has a planar reference surface, and the load of the building floor can be reduced by canceling the leveling layer. The detachable connecting rod is used instead of the permanently installed truss bar, which reduces the steel content and cost while facilitating the installation of pipelines on site.

[0006] The application provides a kind of free to find flat layer and pipeline blocking-free laminated slab, comprising: prefabricated concrete layer, along the first plane pouring is formed;The prefabricated concrete layer includes the first steel bar net laid along the first plane;At least one column of shear key components, at least part of each shear key component is embedded in the prefabricated concrete layer, the rest is from the surface of the prefabricated concrete layer in the first direction upwards to a certain height;The shear key component includes: the upper end in the first direction forms the first connecting end, and / or the lower end in the first direction forms the second connecting end;And at least one connecting rod;One connecting rod and the first connecting end or the second connecting end form detachable connection.

[0007] According to an embodiment of the application, the shear key component includes: an outer frame, the outer frame includes a hollow cavity;One or two embedded nuts;The one embedded nut is arranged in the hollow cavity in the first direction, the upper end of the embedded nut is flush with the upper end of the outer frame and constitutes the first connecting end;Or, the one embedded nut is arranged in the hollow cavity in the first direction, the lower end of the embedded nut is flush with the lower end of the outer frame and constitutes the second connecting end;Or, the two embedded nuts are symmetrically arranged in the hollow cavity in the first direction, the two ends of the two embedded nuts are flush with the upper end and the lower end of the outer frame to constitute the first connecting end and the second connecting end respectively;The outer frame and the embedded nut are filled with concrete;The first embedded steel bar penetrates the lower half of the outer frame, the middle segment of the first embedded steel bar is connected with the embedded nut, and the two ends of the first embedded steel bar extend from the outer frame in the first plane;The first embedded steel bar is pre-embedded in the prefabricated concrete layer;And the second embedded steel bar is lower than the first connecting end and penetrates the outer frame along the second plane, the middle segment of the second embedded steel bar is connected with the embedded nut, and the two ends of the second embedded steel bar extend from the outer frame along the second plane;The second plane is parallel to the first plane.

[0008] According to an embodiment of the application, the height of each first connecting end of the shear key component from the surface of the prefabricated concrete layer is the same, and the first connecting end with the same height constitutes a leveling reference surface.

[0009] According to an embodiment of the application, the height of each connecting end between two or more columns of shear key components from the surface of the prefabricated concrete layer is the same, and the connecting end with the same height constitutes a leveling reference surface.

[0010] According to an embodiment of the application, two or more columns of shear key components are embedded in the prefabricated concrete layer at equal intervals.

[0011] According to an embodiment of the present application, the shear key assembly is staggered with the first steel mesh.

[0012] According to an embodiment of the present application, the connecting rod is selected from one or more of angle steel, H-shaped steel or square steel tube.

[0013] According to an embodiment of the present application, the connecting rod is connected with the embedded nut through a detachable screw rod.

[0014] According to an embodiment of the present application, the composite slab further comprises a second steel mesh; the second steel mesh is lapped along a second plane and is tied on the second embedded steel bar.

[0015] According to an embodiment of the present application, the composite slab further comprises:

[0016] A cast-in-situ concrete layer fills from the surface of the prefabricated concrete to the first connecting end, and is flush with the first connecting end.

[0017] Advantages of the present application:

[0018] The floor slab constructed by the composite slab of the present application does not need to add a building leveling layer, thereby reducing a construction process and improving construction efficiency from the aspect of building technology. The present application can improve the efficiency of the whole process, including greatly improving the factory production efficiency and greatly improving the construction efficiency at the construction site, thereby embodying the industrialization advantage of the present application. Since the building leveling layer is a permanent construction measure and has nothing to do with the structural safety, the cancellation of the building leveling layer can reduce the load of the building floor slab and increase the net height of each floor.

[0019] The connecting rod in the composite slab of the present application is installed in a detachable manner. When hoisting the component on site, the connecting rod can play an auxiliary hoisting function. When threading the pipeline, the connecting rod is detached to provide a construction space for workers to thread the pipeline, thereby overcoming the defects of the permanent truss rib in the prior art.

[0020] The composite slab of the present application adds a connecting rod below as a supporting cross beam, thereby enhancing the strength of the bottom structure of the composite slab and saving the operation time at the construction site. This part of operation amount is changed to be prefabricated in the factory, thereby bringing improvement on the construction technology and construction efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0022] Figure 1 Figure 1 is an isometric view of a precast concrete layer without screed and pipeline obstruction for Example 1.

[0023] Figure 2 Figure 2 is a cross-sectional view of the shear key assembly for Example 1.

[0024] Figure 3 Figure 3 is an A-A cross-sectional view of Figure 1

[0025] Figure 4 Figure 4 is a B-B cross-sectional view of Figure 1

[0026] Figure 5 Figure 5 is a schematic view of the precast concrete layer installation steps for Example 1.

[0027] Figure 6 Figure 6 is a schematic view of the pipeline laying.

[0028] Figure 7 Figure 7 is an isometric view of a precast concrete layer without screed and pipeline obstruction for Example 2.

[0029] Figure 8 Figure 8 is a cross-sectional view of the shear key assembly for Example 2.

[0030] Figure 9 Figure 9 is an A-A cross-sectional view of Figure 7

[0031] Figure 10 Figure 10 is a B-B cross-sectional view of Figure 7

[0032] Figure 11 Figure 11 is a schematic view of the precast concrete layer installation steps for Example 2.

[0033] Figure 12 Figure 12 is an A-A cross-sectional view of a precast concrete layer without screed and pipeline obstruction for Example 3.

[0034] Figure 13 Figure 13 is a schematic view of the precast concrete layer installation steps for Example 3.

[0035] BRIEF DESCRIPTION OF THE DRAWINGS

[0036] 1 - precast concrete layer;

[0037] 11 - first steel mesh;

[0038] 2 - shear key assembly;

[0039] 21 - outer frame;

[0040] 22 - embedded nut;

[0041] 23 - first embedded steel bar;​​​​

[0042] 24 - second embedded steel bar;

[0043] 25 - first connecting end;

[0044] 26 - second connecting end;

[0045] 3 - connecting rod;

[0046] 4 - detachable screw rod;

[0047] 5 - second steel bar mesh;

[0048] 6 - cast-in-place concrete layer;

[0049] 7 - scaffold;

[0050] 8 - pipeline. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0052] In the description of the present application, it should be noted that the terms "upper", "lower", "left", "right", "center", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only for the purpose of description and cannot be understood as indicating or implying relative importance.

[0053] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "setting", "connecting", "connected" and the like should be understood broadly, for example, "connecting" can be fixed connection, can also be detachable connection, or integral connection. It can be a mechanical connection, or an electrical connection. It can be a direct connection, or an indirect connection through an intermediate medium, or a connection between two elements inside. 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.

[0054] Example 1

[0055] Figure 1A schematic view of the laminated slab of the present embodiment is shown, which comprises a prefabricated concrete layer 1, three columns of shear key assemblies 2, and three connecting rods 3. The prefabricated concrete layer 1 is cast along a first plane; the prefabricated concrete layer 1 comprises a first reinforcement mesh 11 laid along the first plane. The lower half of each shear key assembly 2 is embedded in the prefabricated concrete layer 1, and the remaining part thereof protrudes from the surface of the prefabricated concrete layer 1 in a first direction to a certain height and forms a first connecting end 25 at the top end. Each connecting rod 3 is detachably connected to each first connecting end 25 of the column of shear key assemblies 2.

[0056] In the laminated slab of the present embodiment, each first connecting end 25 in each column of shear key assemblies 2 is at the same height from the surface of the prefabricated concrete layer 1, and each first connecting end 25 between two or more columns of shear key assemblies 2 is at the same height from the surface of the prefabricated concrete layer 1. These first connecting ends 25 at the same height constitute a leveling reference surface. In the present embodiment, three columns of shear key assemblies 2 are taken as an example, and the top of each column of shear key assemblies 2 is at the same height, so that the three connecting rods 3 are at the same height for hoisting, and each first connecting end 25 collectively constitutes the leveling reference surface.

[0057] Preferably, the three columns of shear key assemblies 2 are embedded in the prefabricated concrete layer 1 at equal intervals, and the shear key assemblies 2 are arranged staggered with the first reinforcement mesh 11.

[0058] Optionally, the connecting rod 3 is made of one or more of angle steel, H-shaped steel, or square steel tube. Since the connecting rod 3 is mainly used for hoisting, it can be detached after the hoisting is completed, and thus the connecting rod 3 can be made of other materials in the form of a rod. For the convenience of display, angle steel is selected as the connecting rod 3 in the present embodiment.

[0059] Figure 2The schematic diagram of the shear key assembly 2 is shown, and the outer frame 21 is transparent for showing the internal structure. The shear key assembly 2 comprises an outer frame 21, a pre-buried nut 22, a first pre-buried steel bar 23 and a second pre-buried steel bar 24. The outer frame 21 comprises a hollow cavity. The pre-buried nut 22 is arranged in the hollow cavity, and the upper end of the pre-buried nut 22 is flush with the upper end of the outer frame 21 and constitutes the first connecting end 25. The first pre-buried steel bar 23 penetrates the lower half of the outer frame 21, the middle section of the first pre-buried steel bar 23 is connected with the pre-buried nut 22, and the two ends of the first pre-buried steel bar 23 extend from the outer frame 21 along a first plane. The first pre-buried steel bar 23 is pre-buried in the prefabricated concrete layer 1. The second pre-buried steel bar 24 is lower than the first connecting end 25 and penetrates the outer frame 21 along a second plane, the middle section of the second pre-buried steel bar 24 is connected with the pre-buried nut 22, and the two ends of the second pre-buried steel bar 24 extend from the outer frame 21 along the second plane.

[0060] Optionally, the outer frame 21 can be cut from a square steel pipe, a round steel pipe or a polygonal steel pipe, etc. In this embodiment, the outer frame 21 is cut from a square steel pipe, and the outer frame 21 has a hollow cavity.

[0061] More specifically, the first pre-buried steel bar 23 and the second pre-buried steel bar 24 are integrally formed with the pre-buried nut 22 by perforation welding. The outer frame 21, the pre-buried nut 22, the first pre-buried steel bar 23 and the second pre-buried steel bar 24 are made into one shear key assembly 2 by filling concrete between the outer frame 21 and the pre-buried nut 22. Since each pre-buried nut 22 has a threaded hole on the end face of the first connecting end 25, the connecting rod 3 can be detachably connected with the pre-buried nut 22 by screwing a detachable screw rod 4.

[0062] Specifically as shown in Figure 3 and Figure 4 , Figure 3 shows the A-A sectional view of Figure 1 , Figure 4 shows the B-B sectional view of Figure 1 . It should be noted that the first steel bar mesh 11 is hidden in Figure 3 and Figure 4 for clearly showing the sectional structure of Figure 3 and Figure 4 . It can be seen that the first pre-buried steel bar 23 is buried in the prefabricated concrete layer 1, which strengthens the connection strength between the shear key assembly 2 and the prefabricated concrete layer 1. The second pre-buried steel bar 24 is arranged in parallel with the prefabricated concrete layer 1 along the second plane, and the second pre-buried steel bar 24 is located between the first connecting end 25 and the prefabricated concrete layer 1, which is used for lapping the second steel bar mesh 5.

[0063] Figure 5The steps of installing the composite slab of the embodiment are shown in the schematic diagram. It should be noted that, in order to clearly show the installation process, the first reinforcement mesh 11 is hidden in Figure 7

[0064] Step one: bundle the first reinforcement mesh 11 along the first plane, and complete the preparation for pouring the prefabricated concrete layer 1 by surrounding the mold.

[0065] Step two: place the shear key assembly 2, which has been pre-welded, between the first reinforcement mesh 11 of step one, pour concrete into the mold, and between the outer frame 21 and the embedded nut 22; and wait for the concrete to set.

[0066] Step three: align the connecting rod 3 with the first connecting end 25, connect the connecting rod 3 with the shear key assembly 2 after screwing in the detachable screw 4.

[0067] Step four: on the construction site, fix the lifting tool to the connecting rod 3, and then hoist the composite slab to the scaffold 7.

[0068] Step five: after unscrewing the detachable screw 4, the worker removes the connecting rod 3 from the composite slab, exposing the space for pipe laying.

[0069] Step six: lay the pipe on the prefabricated concrete layer 1. Since there is no obstruction from the connecting rod 3, the worker can quickly complete the pipe laying. For details, see Figure 6 .

[0070] Step seven: overlap the second reinforcement mesh 5 on the second embedded steel bar 24, and then pour concrete on the prefabricated concrete layer 1 to form the cast-in-place concrete layer 6.

[0071] The connecting rod 3 in the composite slab of the present application is installed in a detachable manner. When hoisting the component on site, the connecting rod 3 can assist in hoisting. When laying the pipe, the connecting rod 3 is removed to provide construction space for the worker to lay the pipe, overcoming the defects of the permanent truss reinforcement in the prior art. The floor slab constructed using the composite slab of the present application does not need to add a building leveling layer, reducing a construction process from the building technology and improving the construction efficiency. The present application can improve the efficiency of the overall process, including greatly improving the factory production efficiency and greatly improving the construction efficiency on site, which embodies the industrialization advantage of the present application. Since the building leveling layer is a permanent construction measure and has nothing to do with structural safety, canceling the building leveling layer can reduce the load of the building floor slab and increase the net height of each floor.

[0072] Embodiment 2

[0073] Figure 7 ​A schematic diagram of the laminated slab of the embodiment is shown, which comprises: a prefabricated concrete layer 1, a plurality of columns of shear key assemblies 2, and three connecting rods 3. The prefabricated concrete layer 1 is cast along a first plane; the prefabricated concrete layer 1 comprises a first steel mesh 11 laid along the first plane. The lower half of each shear key assembly 2 is embedded in the prefabricated concrete layer 1, and the remaining part protrudes from the surface of the prefabricated concrete layer 1 in a first direction to a certain height. Unlike the first embodiment, the lower half of each shear key assembly 2 is embedded in the prefabricated concrete layer 1, and the lower end of the lower half forms a second connecting end 26. Each connecting rod 3 is detachably connected to each second connecting end 26 of the column of shear key assemblies 2.

[0074] In the embodiment, the shear key assemblies 2 protrude from the surface of the prefabricated concrete layer 1 in the first direction to the same height, and the shear key assemblies 2 of the same height collectively form a leveling reference surface.

[0075] Figure 8 A schematic diagram of the shear key assembly 2 is shown, and the outer frame 21 is transparently processed for clarity of the internal structure. The shear key assembly 2 comprises: an outer frame 21, a pre-buried nut 22, a first pre-buried steel bar 23, and a second pre-buried steel bar 24. The outer frame 21 comprises a hollow cavity. The pre-buried nut 22 is arranged in the hollow cavity, and the lower end of the pre-buried nut 22 is flush with the lower end of the outer frame 21 and forms the second connecting end 26. The first pre-buried steel bar 23 penetrates the lower half of the outer frame 21, the middle section of the first pre-buried steel bar 23 is connected to the pre-buried nut 22, and the two ends of the first pre-buried steel bar 23 protrude from the outer frame 21 along the first plane. The first pre-buried steel bar 23 is pre-embedded in the prefabricated concrete layer 1. The second pre-buried steel bar 24 is lower than the first connecting end 25 and penetrates the outer frame 21 along a second plane, the middle section of the second pre-buried steel bar 24 is connected to the pre-buried nut 22, and the two ends of the second pre-buried steel bar 24 protrude from the outer frame 21 along the second plane.

[0076] Optionally, the outer frame 21 can be cut from a square steel tube, a round steel tube, or a polygonal steel tube, etc. In the embodiment, the outer frame 21 is cut from a square steel tube, and the outer frame 21 has a hollow cavity.

[0077] More specifically, the first pre-buried steel bar 23 and the second pre-buried steel bar 24 are integrally formed with the pre-buried nut 22 by perforation welding. The outer frame 21, the pre-buried nut 22, the first pre-buried steel bar 23, and the second pre-buried steel bar 24 are made into one shear key assembly 2 by filling concrete between the outer frame 21 and the pre-buried nut 22. Since each pre-buried nut 22 has a threaded hole on the end face of the second connecting end 26, the connecting rod 3 can be detachably connected to the pre-buried nut 22 by screwing in the detachable screw rod 4.

[0078] As shown in Figure 9 and Figure 10 , Figure 9 shows Figure 7 A-A sectional view of Figure 10 shows Figure 7 B-B sectional view of Figure 9 and Figure 10 , the first reinforcement mesh 11 is hidden in Figure 9 and Figure 10 for the purpose of clearly showing the sectional structure of

[0079] By using the connecting rod 3 at the bottom of the precast concrete layer 1 to connect each second connecting end 26, the bottom of the precast concrete layer 1 forms a transverse support, which serves as a support beam. This structure can save the need to erect a scaffold 7 in the middle of the overall composite slab. In the construction site, workers only need to erect a scaffold 7 under the two end sides of the composite slab. As shown in Figure 11 , there is no need to erect a scaffold 7 under the center of the composite slab, which necessarily saves the operation time of the construction site, changes this part of the operation amount to pre-manufacture in the factory, thereby bringing improvement to the construction technology and construction efficiency.

[0080] The installation procedure of the composite slab of this embodiment 2 is similar to that of embodiment 1, so this embodiment 2 is not described here.

[0081] Embodiment 3

[0082] This embodiment 3 is a more optimal embodiment after integrating the technical contents of embodiment 1 and embodiment 2. Therefore, only the specific differences are shown in the drawings. Figure 12 shows the B-B sectional view of the composite slab of this embodiment 3.

[0083] The laminated slab in this embodiment 3 comprises: a precast concrete layer 1, a plurality of shear key assemblies 2, and three connecting rods 3. The precast concrete layer 1 is cast along a first plane; the precast concrete layer 1 comprises a first steel mesh 11 laid along the first plane. The lower half of each shear key assembly 2 is embedded in the precast concrete layer 1, and the rest of the shear key assembly 2 protrudes from the surface of the precast concrete layer 1 to a certain height in the first direction. The shear key assembly 2 comprises a first connecting end 25 formed by the upper end of the shear key assembly 2 in the first direction, and a second connecting end 26 formed by the lower end of the shear key assembly 2 in the first direction. Each connecting rod 3 is detachably connected to each second connecting end 26 of the column of shear key assemblies 2.

[0084] As can be seen, the shear key assembly 2 comprises an outer frame 21, two embedded nuts 22, a first embedded steel bar 23, and a second embedded steel bar 24. The outer frame 21 comprises a hollow cavity. The two embedded nuts 22 are symmetrically arranged in the hollow cavity in the first direction, the upper end of one embedded nut 22 is flush with the upper end of the outer frame 21 and constitutes the first connecting end 25, and the lower end of the other embedded nut 22 is flush with the lower end of the outer frame 21 and constitutes the second connecting end 26. The first embedded steel bar 23 penetrates the lower half of the outer frame 21, the middle section of the first embedded steel bar 23 is connected to the embedded nut 22, and the two ends of the first embedded steel bar 23 protrude from the outer frame 21 along the first plane. The first embedded steel bar 23 is pre-embedded in the precast concrete layer 1. The second embedded steel bar 24 is lower than the first connecting end 25 and penetrates the outer frame 21 along a second plane, the middle section of the second embedded steel bar 24 is connected to the embedded nut 22, and the two ends of the second embedded steel bar 24 protrude from the outer frame 21 along the second plane.

[0085] When hoisting the components on site, the connecting rod 3 connected to the upper first connecting end 25 can assist in hoisting. When threading pipelines, the connecting rod 3 is detached to provide construction space for workers to thread the pipelines, overcoming the defects of the permanent truss reinforcement in the prior art. By using the connecting rod 3 at the bottom of the precast concrete layer 1 to connect each second connecting end 26, a horizontal support is formed at the bottom of the precast concrete layer 1, which serves as a support for the cross beam. This structure can save the need to erect a scaffold 7 in the middle of the overall laminated slab. In the construction site, workers only need to erect a scaffold 7 below the two ends of the laminated slab.

[0086] Figure 13 The steps of installing the laminated slab in this embodiment 3 are shown in the schematic diagram. It should be noted that, in order to clearly show the installation process, the first steel mesh 11 is hidden in Figure 13 .

[0087] Step one: bundle the first steel mesh 11 along the first plane, and the side mold is enclosed to complete the preparation of pouring the prefabricated concrete layer 1.

[0088] Step two: place the shear key assembly 2 that has been welded in advance between the first steel mesh 11 of step one, pour concrete into the side mold, and between the outer frame 21 and the embedded nut 22; wait for the concrete to set.

[0089] Step three: align the connecting rod 3 located above with the first connecting end 25, connect the connecting rod 3 with the shear key assembly 2 after rotating the detachable screw rod 4, and align the connecting rod 3 located below with the second connecting end 26, connect the connecting rod 3 with the shear key assembly 2 after rotating the detachable screw rod 4.

[0090] Step four: on the construction site, fix the lifting tool with the connecting rod 3, then hoist the laminated slab to the scaffold 7, since the connecting rod in the middle of the laminated slab is used as a support beam, only the scaffold 7 on both sides needs to be built here.

[0091] Step five: after rotating out the detachable screw rod 4, the worker removes the connecting rod 3 from the laminated slab, exposing the space for pipe laying.

[0092] Step six: lay the pipe on the prefabricated concrete layer 1, since there is no obstruction of the connecting rod 3, the worker can quickly complete the pipe laying, for details, see Figure 6 .

[0093] Step seven: overlap the second steel mesh 5 on the second embedded steel bar 24, then pour concrete into the prefabricated concrete layer 1 to form the cast-in-place concrete layer 6.

[0094] Step eight: rotate out the detachable screw rod 4 at the bottom and remove the connecting rod 3 located below.

[0095] The connecting rod 3 is detachably installed in the laminated slab of the embodiment. When hoisting the components on site, the connecting rod 3 can play an auxiliary hoisting function. When threading the pipeline, the connecting rod 3 is detached to provide a construction space for workers to thread the pipeline, overcoming the defects of the permanent truss rib in the prior art. The floor slab constructed by the laminated slab of the embodiment does not need to add a building leveling layer, reducing a construction process from the building technology and improving the construction efficiency. The embodiment can improve the efficiency of the overall process, including greatly improving the factory production efficiency and greatly improving the construction efficiency on site, which reflects the industrialization advantage of the embodiment. Since the building leveling layer is a permanent construction measure and has nothing to do with the structural safety, canceling the building leveling layer can reduce the load of the building floor slab and increase the net height of each floor. The scaffold 7 does not need to be erected below the center of the laminated slab, and the construction site operation time is also saved. This part of the operation is changed to be pre-made in the factory, thereby improving the construction process and construction efficiency.

[0096] The above merely provides the preferred embodiments of the present application and is not intended to limit the present application. Any modification, improvement, equivalent replacement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A self-leveling layer and pipeline blocking-free laminated slab, characterized in that, The application relates to a prefabricated concrete layer poured along a first plane, wherein a first steel mesh is arranged along the first plane; at least one shear key assembly is arranged in the prefabricated concrete layer, and the rest of the shear key assembly is arranged to protrude from the surface of the prefabricated concrete layer along a first direction; the shear key assembly comprises a first connecting end formed by the upper end of the shear key assembly along the first direction and / or a second connecting end formed by the lower end of the shear key assembly along the first direction; and at least one connecting rod is arranged to be detachably connected to the first connecting end or the second connecting end. The shear key assembly comprises an outer frame, one or two embedded nuts, a first embedded steel bar and a second embedded steel bar. The outer frame comprises a hollow cavity. The one embedded nut is arranged in the hollow cavity along the first direction, and the upper end of the embedded nut is flush with the upper end of the outer frame and forms the first connecting end. The two embedded nuts are symmetrically arranged in the hollow cavity along the first direction, and the two ends of the two embedded nuts are flush with the upper end and the lower end of the outer frame and form the first connecting end and the second connecting end respectively. The first embedded steel bar penetrates the lower half of the outer frame, the middle section of the first embedded steel bar is connected to the embedded nut, and the two ends of the first embedded steel bar protrude from the outer frame along the first plane. The second embedded steel bar is lower than the first connecting end and penetrates the outer frame along a second plane, the middle section of the second embedded steel bar is connected to the embedded nut, and the two ends of the second embedded steel bar protrude from the outer frame along the second plane. The second plane is parallel to the first plane. The height of each first connecting end of the shear key assembly from the surface of the prefabricated concrete layer is the same, and the first connecting ends with the same height form a leveling reference surface. The outer frame is made of a steel pipe. The shear key assembly is arranged staggered with the first steel mesh. The height of each connecting end from the surface of the prefabricated concrete layer between two or more shear key assemblies is the same, and the connecting ends with the same height form a leveling reference surface.

2. The self-leveling layer and pipe-line obstruction free composite slab as claimed in claim 1, wherein, The two or more shear key assemblies are equidistantly arranged in the prefabricated concrete layer.

3. The self-leveling layer and pipe-line obstruction free laminated slab as claimed in claim 1 wherein, The connecting rod is selected from one or more of angle steel, H-shaped steel or square steel pipe.

4. The self-leveling layer and pipe-line obstruction free composite slab as claimed in claim 1, wherein, The connecting rod is connected to the embedded nut through a detachable screw rod.

5. The self-leveling layer and pipe-line obstruction free composite slab as claimed in claim 1, wherein, The laminated slab further comprises a second steel mesh.

6. The self-leveling layer and pipe-line obstruction free composite slab as claimed in claim 1, wherein, The laminated slab further comprises a cast-in-place concrete layer filled from the surface of the prefabricated concrete layer to the first connecting end, and the cast-in-place concrete layer is flush with the first connecting end.

7. The self-leveling layer and pipe-line obstruction free composite slab as claimed in any one of claims 1 to 6, wherein, ​ ​

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