CN114277992A - Laminated slab for fabricated building and construction method - Google Patents
Laminated slab for fabricated building and construction method Download PDFInfo
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- CN114277992A CN114277992A CN202111433475.6A CN202111433475A CN114277992A CN 114277992 A CN114277992 A CN 114277992A CN 202111433475 A CN202111433475 A CN 202111433475A CN 114277992 A CN114277992 A CN 114277992A
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- 238000010276 construction Methods 0.000 title claims abstract description 28
- 239000011178 precast concrete Substances 0.000 claims abstract description 25
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 21
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 16
- 239000004567 concrete Substances 0.000 claims description 41
- 229910000831 Steel Inorganic materials 0.000 claims description 33
- 239000010959 steel Substances 0.000 claims description 33
- 239000002131 composite material Substances 0.000 claims description 23
- 238000007789 sealing Methods 0.000 claims description 6
- 229910000746 Structural steel Inorganic materials 0.000 claims 2
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 238000005336 cracking Methods 0.000 abstract description 7
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000002787 reinforcement Effects 0.000 description 13
- 239000002184 metal Substances 0.000 description 10
- 238000005452 bending Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- 238000003466 welding Methods 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 5
- 210000002435 tendon Anatomy 0.000 description 5
- 238000005266 casting Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000006261 foam material Substances 0.000 description 2
- 238000009415 formwork Methods 0.000 description 2
- 239000011372 high-strength concrete Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000009417 prefabrication Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
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Abstract
The invention discloses a laminated slab for an assembly type building and a construction method, and belongs to the technical field of laminated slabs. The technical scheme is as follows: a laminated slab for prefabricated buildings comprises a reinforcing mesh and precast concrete which is locally poured on the reinforcing mesh; the reinforcing mesh comprises a plurality of reinforcing frames which are arranged in parallel; the reinforcing steel bar frame comprises three straight bars which are arranged in a shape like a Chinese character 'pin', a plurality of supporting pieces which are respectively matched with the three straight bars and are uniformly arranged along the central line direction of the straight bars, and two connecting pieces which are correspondingly positioned at the two ends of the straight bars; the straight ribs comprise a top straight rib positioned at the top of the Chinese character pin and two foot straight ribs positioned at the bottom of the Chinese character pin; the connecting piece is respectively matched with the two straight ribs of the foot. The invention has the beneficial effects that: the laminated plate for the fabricated building provided by the invention has the advantages of simple structure, low manufacturing cost, stable structure and low cracking risk, and the provided construction method is time-saving, labor-saving and simple to operate.
Description
Technical Field
The invention relates to the technical field of laminated slabs, in particular to a laminated slab for an assembly type building and a construction method.
Background
Composite slabs, which are typically between 5 cm and 8 cm thick in fabricated buildings, form a complete floor layer by casting concrete in situ on top of them. Generally, in a laminated slab, a transverse, or longitudinal, or lattice-shaped reinforcing bar, also called a structural reinforcing bar, is provided, and the layered arrangement is achieved by supporting the reinforcing bar. The lower part of the laminated slab is supported by the laminated slab supporting system in the pouring process, the laminated slab can be used as a bottom die for pouring, and a template is not required to be arranged for cast-in-place concrete, so that the laminated slab technology has the advantages of good crack resistance, no increase of consumption of reinforcing steel bars, template saving and the like. The supporting system of the conventional scaffold can refer to CN201721812295.8, CN201520604113.2, CN201721743621.4 or CN 205935745U.
Because the thickness of the laminated slab is relatively thin and is usually only between 5 cm and 8 cm, in the prior art, the bottom of the laminated slab needs to be supported by matching with a laminated slab supporting system so as to facilitate the pouring work of upper concrete. With respect to the laminated slab support system technology, reference may be made to the following technical documents:
CN106193589B discloses a frame beam support frame and a laminated slab support frame, wherein the frame beam and the laminated slab are respectively supported at the bottom by a bailey frame to overcome the problems of pouring and self-weight. The technique adopts the Bailey truss for supporting, and reduces the number of steel pipes and battens required by a field supporting system on the basis of ensuring the construction quality compared with the traditional construction method. But because of the heavy characteristic of bailey truss itself, there is the degree of difficulty of dismouting and transfer.
The invention discloses a supporting structure and a laminated slab structure based on the same, wherein the supporting structure comprises a node connecting piece, a force transmission piece and two diagonal structures, wherein one end of the force transmission piece is connected to the node connecting piece, the other end of the force transmission piece is used for being movably connected with the laminated slab, one ends of the two diagonal structures are connected to the node connecting piece, the other ends of the two diagonal structures are used for being movably connected with the laminated slab, and the two diagonal structures are respectively positioned on two sides of the force transmission piece. By adopting the structure, one laminated slab only needs one group of supporting structure, the cost is low, the dead weight is light, and the disassembly and the assembly are time-saving and labor-saving. However, the applicant believes that the disadvantages are obvious, and the force transmission piece is in an inclined state, so that the stability is poor, and the cast requirement on site is difficult to meet.
The two support structures are used for replacing the existing scaffold support system, have advantages and disadvantages respectively, but have certain limitations.
In the CN207673045U document, the supporting system supports the prefabricated composite slab by using the nuts embedded in the prefabricated shear wall in advance as fulcrums, and does not depend on the edge width of the shear wall, and eliminates the vertical support (usually scaffold) at the lower part of the floor slab, thereby reducing the formwork supporting difficulty, saving the cost, and meeting the construction precision. However, since the laminated slab is generally a large-span and large-area thin slab and has a characteristic of low strength, the laminated slab inevitably has problems of fracture, cracking and the like in the process of using the technology, and the breakage rate of the laminated slab in the casting process is relatively high.
For another example, in the document CN108661313A, the supporting device is used to solve the problem that the existing cast-in-place connection of concrete composite floor slab adopts a suspended form or a traditional full-space supporting manner. In the technical scheme, the middle of the supporting beam is provided with two supporting upright jacks, two transverse adjusting pieces are symmetrically arranged at two ends of the supporting beam and are in threaded connection with the supporting beam, the two supporting upright posts correspond to the two supporting upright jacks one by one, the supporting upright posts are spliced with the supporting beam, the upper end of each supporting upright post is in threaded connection with one vertical adjusting piece, the upper end of each vertical adjusting piece is in threaded connection with one U-shaped bracket, one template supporting beam is arranged in each U-shaped bracket, and the bottom template is arranged on the two template supporting beams. The device is used for the construction of assembled superimposed concrete floor, and although the structure is simplified, the risk of instability of the supporting system is brought.
The applicant has studied in detail in the work and found that the risk of such a support system is mainly due to the fact that in the prior art construction, the superimposed slab is only a single one, which is completely supported by the support system, and no effective connection is formed between the superimposed slabs, which is the root of the systematic instability.
How to solve the above technical problems is the subject of the present invention.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a laminated slab for an assembly type building, which has the advantages of simple structure, low manufacturing cost, stable structure and low cracking risk, and a construction method of the laminated slab for the assembly type building, which is time-saving, labor-saving and simple to operate.
In order to achieve the above object, the present invention provides a composite slab for prefabricated buildings, which comprises a steel bar mesh, and precast concrete partially cast on the steel bar mesh;
the reinforcing mesh comprises a plurality of reinforcing frames which are arranged in parallel;
the reinforcing steel bar frame comprises three straight bars which are arranged in a shape like a Chinese character 'pin', a plurality of supporting pieces which are respectively matched with the three straight bars and are uniformly arranged along the central line direction of the straight bars, and two connecting pieces which are correspondingly positioned at two ends of the straight bars;
the straight ribs comprise a top straight rib positioned at the top of the Chinese character pin and two foot straight ribs positioned at the bottom of the Chinese character pin;
the connecting piece is respectively matched with the two foot straight ribs;
the top of the supporting sheet and the top straight ribs are completely exposed outside the precast concrete and used for secondary concrete pouring on site, and the bottom of the supporting sheet and the foot straight ribs are poured in the precast concrete, namely the precast concrete is pre-buried at the bottom of the foot straight ribs and the supporting sheet in the degree of prefabrication in a factory.
During construction, the joints between two adjacent laminated slabs are poured into a whole through secondary concrete, and the tops of the supporting sheets and the straight ribs at the tops of the supporting sheets are poured in the secondary concrete.
The invention is characterized in that the support sheet is provided with three first through holes which are arranged in a shape like a Chinese character pin and correspond to the three straight ribs one by one, the first through holes are in clearance fit with the corresponding straight ribs, further, the support sheet is arranged as a steel plate stamping part to replace the original saddle support part, the structure is firmer than the original saddle support structure, concretely, the combination between the first through holes and the corresponding straight ribs is tighter than the saddle support structure, and the reinforcement frame is convenient to manufacture, further, the straight ribs and the support sheet are connected by spot welding, the stability of the reinforcement frame is further improved, when in manufacturing, the straight ribs and the support sheet can be penetrated at one time, then the whole reinforcement frame is welded and formed, preferably, the support sheet is arranged as a triangular structure, the structure is closer to the cross section outline structure of the reinforcement frame, under the condition that other factors are not considered, it is also possible that the support plates are rectangular steel plate structures.
The invention is characterized in that the laminated slab for the fabricated building also comprises a plurality of groups of notches which are reserved at two ends of the precast concrete correspondingly, the notches are reserved at the connecting piece, when two adjacent laminated slabs are installed, auxiliary connection can be carried out at the notches, the connection strength of the joint between the two laminated slabs is increased, and the installation operation of the auxiliary connection can be realized by arranging the notches.
The invention is particularly characterized in that the cross section of the connecting piece is U-shaped, the opening of the connecting piece is placed inwards, preferably, the connecting piece is formed by cutting channel steel section, two second through holes which correspond to the two straight ribs on the foot part one by one are correspondingly formed in the sealing plate of the connecting piece, the two second through holes are respectively close to the side plates corresponding to the connecting piece, bolt holes are further formed in the sealing plate, and the notch is positioned on the inner side of the sealing plate, so that when two adjacent laminated slabs are installed, the auxiliary mechanical connection between the two laminated slabs is realized through the connection of a group of bolt assemblies, compared with the non-mechanical connection mode between the adjacent laminated slabs in the prior art, the connection mode can effectively prevent cracks or cracking phenomena at the joint of the laminated slabs, and particularly, in the process of secondary concrete pouring, the connection mode can effectively prevent local dislocation and the occurrence of the cracking phenomena at the joint of the laminated slabs, referring to the attached figure 7, Even the phenomenon of shedding, when secondary concrete pouring construction, the breach behind the bolt assembly connection is pour can. Even in the curing and using processes after the secondary concrete pouring is finished, the connection strength of the splicing seam of the two laminated slabs can be improved. The design changes the relative independence of the original laminated slabs into mutual connection, can ensure the non-contact existence between the two adjacent laminated slabs and leaves a space for secondary concrete pouring.
The present invention is specifically characterized in that the composite slab for prefabricated building further comprises a plurality of auxiliary bars, wherein the plurality of auxiliary bars are arranged in a grid-like cross manner, preferably, the auxiliary bars and the straight bars at the foot are fixed by means of buckles or steel wire binding, so that the auxiliary bars and the straight bars at the foot are connected to form a reinforcing mesh with a three-dimensional protection space, the reinforcing mesh has a three-dimensional space, and a plurality of auxiliary bars and the plurality of reinforcing frames 100 form an integrated structure, and are combined to ensure the strength of the composite slab in the longitudinal and transverse directions, and a frame surrounding the precast concrete, wherein both ends of the straight bars and both ends of the auxiliary bars extend to the outside of the frame, for example, the length of 10cm outside the frame, and when the composite slab is used for secondary on-site casting, a lap joint structure is formed between two adjacent composite slabs, further, the end parts of the straight ribs and/or the end parts of the auxiliary ribs in the rejection structure area can be bent, for example, the end parts of the straight ribs are partially bent to form a U shape or an L shape, the bending structure can further improve the connection strength and the connection quality of secondary concrete pouring between two adjacent laminated plates, wherein the two ends of the straight ribs of the foot parts and the two ends of the auxiliary ribs penetrate through the frame, preferably, the frame is formed by rolling and welding a thin steel plate, for example, in the embodiment, the frame is a rectangular frame, the material of the frame is set to be metal, the section of the metal frame is set to be C-shaped, namely, the metal of the frame is subjected to sheet metal rolling to form a special-shaped structure, and the overall rigidity of the metal frame can be improved.
In addition, in the process of prefabricating the composite slabs, the frame is used as a side template, the bottom template is matched for pouring concrete, and the strength of the concrete can meet the use requirements of general projects without special requirements. The design of arranging the frame as the frame of the laminated slab enables the manufacturing process of the laminated slab to be optimized and the die cost of the laminated slab to be reduced.
The invention is characterized in that the connecting piece is positioned at the inner side of the frame, and further, the connecting piece is fixedly connected with the inner side wall of the frame.
The concrete characteristics of the invention are that the straight ribs and the auxiliary ribs are made of deformed steel bars, the diameter of the auxiliary ribs is smaller than that of the straight ribs, the diameter of the top straight ribs is larger than that of the foot straight ribs, for example, the top straight ribs are set to be phi 20mm, the foot straight ribs are set to be phi 12mm, and the diameter of the auxiliary ribs is set to be phi 6mm, and in the secondary concrete pouring construction stage, the top straight ribs mainly bear compressive stress, namely, bending moment is provided, so thicker deformed steel bars are selected; the straight muscle of foot mainly bears be tensile stress, promptly, does not have the moment of flexure, consequently selects thinner screw-thread steel, can alleviate its dead weight when guaranteeing coincide plate structure stability, dismouting labour saving and time saving reduces the site operation degree of difficulty.
The invention is further characterized in that the top straight rib is provided as an angle steel or a channel steel, and the profile of the corresponding first through hole in the support sheet corresponds to the first through hole, see fig. 12 to 14.
Furthermore, the top straight rib is a steel pipe, a round steel pipe or a square steel pipe can be adopted, and high-strength concrete is poured in the steel pipe, so that the steel pipe forms a solid structure, the bending strength of the laminated slab can be further improved, especially, the laminated slab can have strong bending resistance, and the outline of the corresponding first through hole in the support sheet corresponds to the outline of the corresponding first through hole, which is shown in the attached drawings 15 and 16.
The concrete characteristics of the invention are that a plurality of light modules are embedded on the top surface of the precast concrete, as shown in the attached drawings 1 and 2, preferably, the plurality of light modules are arranged in an array, and the light modules are arranged in a foam material or air bag structure, so that the connection strength, especially the anti-cracking capability, of the laminated slab is effectively improved, the overall performance of the laminated slab is improved, and especially, the light modules are matched with the straight ribs and the auxiliary ribs for use, and the light modules have positive significance for improving the performance of the laminated slab.
A construction method using the laminated slab for the fabricated building comprises the following steps:
step S1: prefabricating laminated slabs for prefabricated buildings;
step S2: placing the longitudinal two ends of the laminated slab prefabricated in the step S1 on corresponding beams, and sequentially placing a plurality of laminated slabs along the transverse direction;
step S3: supporting the lower parts of the plurality of superimposed sheets by using a supporting system, adjusting the flatness of the plurality of superimposed sheets, and plugging a splicing seam between two adjacent superimposed sheets by using a template to form a secondary concrete pouring space;
step S4: and pouring secondary concrete on the upper parts of the laminated slabs and the splicing seams, and tamping, trowelling and maintaining to finish the construction of the floor layer.
The present invention is also specifically characterized in that the step S1 includes the following steps:
step S101: the straight bars and the supporting sheets are penetrated, spot welding can be assisted between the straight bars and the supporting sheets, connecting pieces are sleeved at two ends of the straight bars at the foot parts to form reinforcing steel bar frames, and then a plurality of reinforcing steel bar frames are arranged on the bottom template in parallel;
step S102: auxiliary bars are arranged among the bottoms of the plurality of reinforcing steel bar frames in a direction perpendicular to the straight bars, and the auxiliary bars are bound and connected with the straight bars at the feet;
step S103: the bottom of the reinforcing steel bar frame is surrounded with a frame, the end parts of the foot straight bars and the auxiliary bars penetrate through the frame, the end part of the top straight bar extends to the outer side of the frame, and preferably, the connecting piece is fixedly connected with the frame;
step S104: installing an embedded part at the connecting part to form a notch after pouring;
step S105: performing precast concrete pouring in the frame;
preferably, the step S1 further includes the step S106: and a plurality of light modules are embedded on the top surface of the precast concrete.
The invention has the beneficial effects that: due to the use of the supporting sheet, the integral bending resistance of the laminated slab is obviously improved, the positioning and welding difficulty between the supporting sheet and the straight ribs in the manufacturing process is reduced, and the manufacturing cost is reduced; the framework is arranged, so that the difficulty of a manufacturing mold of the laminated slab is greatly reduced in the manufacturing process of the laminated slab, and the investment of plant facilities is reduced; the auxiliary connection is carried out between the laminated slabs, the auxiliary connection strength between the laminated slabs is further improved, the stability of the laminated slabs and the supporting system of the laminated slabs in the secondary concrete pouring process is improved, the construction safety is facilitated, and the mechanical auxiliary connection is poured in a secondary concrete pouring body after the secondary pouring, so that the safety performance of a building is improved. The construction method provided by the invention has the advantages of simple steps, time and labor saving, stable structure and suitability for wide popularization and application.
Drawings
FIG. 1 is a schematic diagram illustrating an embodiment of the present invention;
FIG. 2 is a schematic structural view of the present invention;
FIG. 3 is a top view of the present invention;
fig. 4 is a structural view of a reinforcing mesh in the present invention;
FIG. 5 is an enlarged view of a portion A of FIG. 4;
FIG. 6 is a schematic view of a connecting node between two adjacent laminated plates according to the present invention;
FIG. 7 is a schematic cross-sectional view of a frame according to the present invention;
FIG. 8 is a schematic structural view of a support sheet according to the present invention;
FIG. 9 is a schematic view of the structure of the connector of the present invention;
FIG. 10 is a schematic view I of construction effect of a connecting joint of two adjacent laminated slabs in the invention;
FIG. 11 is a schematic diagram II of construction effects of a connecting joint of two adjacent superimposed sheets according to the present invention;
FIG. 12 is a schematic view showing the connection relationship between the support sheet and the top straight rib of the present invention;
FIG. 13 is a schematic view II of the connection relationship between the support sheet and the top straight rib according to the present invention;
FIG. 14 is a schematic view showing the connection relationship between the support sheet and the top straight rib of the present invention;
FIG. 15 is a schematic view IV of the connection relationship between the support sheet and the top straight rib according to the present invention;
fig. 16 is a schematic view v illustrating the connection relationship between the support piece and the top straight rib according to the present invention.
Wherein the reference numerals are: 100. a reinforcing steel bar frame; 110. straightening ribs; 101. a top straight rib; 102. straight tendons of feet; 120. a support sheet; 121. a first perforation; 121', a second perforation; 130. a frame; 140. a connecting member; 141. bolt holes; 150. auxiliary ribs; 160. a lightweight module; 200. a notch; 210. a bolt assembly; 300. and (5) secondary concrete.
Detailed Description
In order to clearly illustrate the technical features of the present solution, the present solution is explained below by way of specific embodiments.
Example 1
Referring to fig. 1 to 12, an embodiment of the present invention provides a composite slab for prefabricated buildings, including a reinforcing mesh, and precast concrete partially cast on the reinforcing mesh;
the reinforcing mesh comprises a plurality of reinforcing frames 100 which are arranged in parallel;
the reinforcement frame 100 includes three straight tendons 110 arranged in a "pin" shape, a plurality of support pieces 120 respectively engaged with the three straight tendons 110 and uniformly arranged along the central line direction of the straight tendons 110, and two connectors 140 correspondingly located at both ends of the straight tendons 110;
the straight ribs 110 comprise a top straight rib 101 positioned at the top of the Chinese character 'pin' and two foot straight ribs 102 positioned at the bottom of the Chinese character 'pin';
the connecting pieces 140 are respectively matched with the two foot straight ribs 102;
the top of the support piece 120 and the top straight rib 101 are completely exposed outside the precast concrete and used for secondary concrete pouring on site, and the bottom of the support piece 120 and the foot straight rib 102 are poured in the precast concrete, namely, the precast concrete is pre-buried at the bottom of the foot straight rib 102 and the support piece 120 in the degree of prefabrication in a factory.
During construction, the joints between two adjacent laminated slabs are poured into a whole through the secondary concrete 300, and the top of the support sheet 120 and the top straight ribs 101 are poured in the secondary concrete 300.
The invention is characterized in that the support sheet 120 is provided with three first through holes 121 which are arranged in a shape like a Chinese character pin and correspond to the three straight ribs 110 one by one, the first through holes 121 are in clearance fit with the corresponding straight ribs 110, further, the support sheet 120 is provided as a steel plate stamping part to replace the original saddle support structure, which is firmer than the original saddle support structure, specifically, the combination between the first through holes 121 and the corresponding straight ribs 110 is tighter than the saddle support structure, and is convenient for manufacturing the reinforcement frame 100, further, the straight ribs 110 and the support sheet 120 are connected by spot welding, the stability of the reinforcement frame 100 is further improved, when manufacturing, the straight ribs 110 and the support sheet 120 can be penetrated at one time and then integrally welded to form, preferably, the support sheet 120 is provided with a triangular structure, which is closer to the profile structure of the section of the reinforcement frame 100, it is also possible that the support plate 120 may have a rectangular steel plate structure, regardless of other factors; in addition, the support sheet 120 in the present embodiment may have a two-dimensional planar structure or a three-dimensional support structure.
The concrete characteristics of the invention are that the laminated slab for the fabricated building also comprises a plurality of groups of notches 200 which are reserved at two ends of the precast concrete correspondingly, the notches 200 are reserved at the connecting piece 140, when two adjacent laminated slabs are installed, the notches 200 can be connected in an auxiliary manner, the connecting strength of the joint between the two laminated slabs is increased, and the installation operation of the auxiliary connection can be realized by arranging the notches 200.
The present invention is further characterized in that the cross-sectional shape of the connecting member 140 is U-shaped, and the opening is disposed inward, preferably, the connecting member 140 is formed by cutting channel steel section, the closing plate thereof is correspondingly provided with two second through holes 121 'corresponding to the two straight foot ribs 102 one by one, the two second through holes 121' are respectively close to the side plates corresponding to the connecting member 140, the closing plate is further provided with bolt holes 141, and the notches 200 are located at the inner side of the closing plate, so that when two adjacent superimposed plates are installed, the auxiliary mechanical connection between the two superimposed plates is realized by the connection of a group of bolt assemblies 210, compared with the non-mechanical connection between the adjacent superimposed plates in the prior art, the connection can effectively prevent the occurrence of cracks or splits at the joint of the superimposed plates, referring to fig. 7, especially, during the secondary concrete 300 pouring construction, the occurrence of local dislocation between the superimposed plates can be effectively prevented, Even the phenomenon of droing, when secondary concrete 300 pours the construction, pour the breach behind the bolt assembly connection can. Even in the curing and using processes after the secondary concrete 300 is poured, the connecting strength of the splicing seam of the two laminated slabs can be improved. The design changes the relative independence of the original laminated slabs into mutual connection, can ensure the non-contact existence between the two adjacent laminated slabs and leaves a space for secondary concrete pouring.
The present invention is further characterized in that the composite slab for prefabricated building further comprises a plurality of auxiliary bars 150 arranged in a grid-like cross manner on the plurality of reinforcement frames, preferably, the auxiliary bars 150 are fixed to the straight bars 102 of the foot part by means of fasteners or steel wire ties, so that the auxiliary bars 150 are connected to the straight bars 102 of the foot part, and finally a reinforcement mesh having a three-dimensional protection space is formed, the reinforcement mesh having a three-dimensional space, and so that the plurality of auxiliary bars 150 and the plurality of reinforcement frames 100 form an integral structure, and the reinforcement mesh is combined, so that the strength of the composite slab in the longitudinal and transverse directions is ensured, and a frame 130 surrounding the precast concrete, wherein both ends of the straight bars 110 and both ends of the auxiliary bars 150 extend to the outside of the frame 130, for example, to the outside of the frame 130 by a length of 10cm, and a lap joint structure is formed between two adjacent composite slabs when the composite slab is poured on site, further, the end of the straight rib 110 and/or the end of the auxiliary rib 150 in the rejection structure area may be bent, for example, the end of the straight rib 110 is partially bent to form a U shape or an L shape, and this bent structure may further improve the connection strength and connection quality of secondary concrete pouring between two adjacent laminated slabs, wherein both ends of the foot straight rib 102 and both ends of the auxiliary rib 150 penetrate through the frame 130, preferably, the frame 130 is formed by rolling and welding a thin steel plate, for example, in this embodiment, the frame is a rectangular frame, the material of the frame 130 is set to be metal, the cross section of the metal frame is set to be C-shaped, that is, the metal of the frame 130 is rolled by a metal plate to form a special-shaped structure, and the overall rigidity of the metal frame may be improved.
In addition, in the process of prefabricating the composite slabs, the frame 130 is also used as a side template and is matched with a bottom template to pour concrete, and the strength of the concrete can meet the use requirements of general projects without special requirements. The design of arranging the frame as the frame of the laminated slab enables the manufacturing process of the laminated slab to be optimized and the die cost of the laminated slab to be reduced.
The present invention is further characterized in that the connecting member 140 is located inside the frame 130, and further, the connecting member 140 is fixedly connected to the inner sidewall of the frame 130.
The concrete characteristics of the invention are also that the straight bar 110 and the auxiliary bar 150 are both made of deformed steel bars, the diameter of the auxiliary bar 150 is smaller than that of the straight bar 110, the diameter of the top straight bar 101 is larger than that of the foot straight bar 102, for example, the top straight bar 101 is set to be phi 20mm, the foot straight bar 102 is set to be phi 12mm, and the diameter of the auxiliary bar 150 is set to be phi 6mm, and in the secondary concrete pouring construction stage, the top straight bar 101 mainly bears compressive stress, namely, bending moment is provided, so thicker deformed steel bars are selected; the straight foot ribs 102 are mainly subjected to tensile stress, i.e., there is no bending moment, so finer thread steel is selected.
The concrete characteristics of the invention are that a plurality of light modules 160 are embedded on the top surface of the precast concrete, as shown in fig. 1 and 2, preferably, the plurality of light modules 160 are arranged in an array, and the light modules 160 are configured into a foam material or an air bag structure, so that the connection strength, especially the anti-cracking capability, of the laminated slab is effectively improved, the overall performance of the laminated slab is improved, and especially, the light modules are matched with the straight ribs 110 and the auxiliary ribs 150 for use, so that the invention has positive significance for improving the performance of the laminated slab.
A construction method using the composite slab for a fabricated building in the present embodiment includes the steps of:
step S1: prefabricating laminated slabs for prefabricated buildings;
step S2: placing the longitudinal two ends of the laminated slab prefabricated in the step S1 on corresponding beams, and sequentially placing a plurality of laminated slabs along the transverse direction;
step S3: supporting the lower parts of the plurality of superimposed sheets by using a supporting system, adjusting the flatness of the plurality of superimposed sheets, and plugging a splicing seam between two adjacent superimposed sheets by using a template to form a secondary concrete pouring space;
step S4: and pouring secondary concrete on the upper parts of the laminated slabs and the splicing seams, and tamping, trowelling and maintaining to finish the construction of the floor layer.
The present invention is also specifically characterized in that the step S1 includes the steps of:
step S101: the straight bars 110 and the supporting plates 120 are penetrated, spot welding can be assisted between the straight bars 110 and the supporting plates 120, connectors 140 are sleeved at the two ends of the foot straight bars 102 to form the reinforcing steel frames 100, and then a plurality of reinforcing steel frames 100 are arranged on the bottom formwork in parallel;
step S102: auxiliary bars 150 are arranged among the bottoms of the plurality of reinforcing steel bar frames 100 in a direction perpendicular to the straight bars, and the auxiliary bars 150 are bound and connected with the foot straight bars 102;
step S103: a frame 130 is arranged around the bottom of the steel bar frame 100, the ends of the foot straight bars 102 and the auxiliary bars 150 penetrate through the frame 130, the end of the top straight bar 101 extends to the outside of the frame 130, and preferably, the connecting piece 140 is fixedly connected with the frame 130;
step S104: installing embedded parts at the connecting parts 140 to form a notch 200 after pouring;
step S105: precast concrete casting is performed within the frame 130;
preferably, step S1 further includes step S106: a plurality of lightweight modules 160 are embedded on the top surface of the precast concrete.
Example 2
The rest of example 1 is the same as example 1, except that: the top straight rib 101 is provided as an angle or channel, and the corresponding first aperture 121 in the support plate 120 is contoured to correspond thereto, see fig. 12 to 14.
Or the top straight rib 101 is a steel pipe, a round steel pipe or a square steel pipe can be adopted, and high-strength concrete is poured into the steel pipe, so that the steel pipe forms a solid structure, the bending strength of the composite slab can be further improved, especially the composite slab can have strong bending resistance, and the corresponding first through hole 121 in the support piece 120 has a corresponding outline, which is shown in fig. 15 and 16.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A laminated slab for an assembly type building is characterized by comprising a reinforcing mesh and precast concrete which is locally poured on the reinforcing mesh;
the reinforcing mesh comprises a plurality of reinforcing frames (100) which are arranged in parallel;
the reinforcing steel bar frame (100) comprises three straight reinforcing steel bars (110) which are arranged in a shape like a Chinese character 'pin', a plurality of supporting pieces (120) which are respectively matched with the three straight reinforcing steel bars (110) and are uniformly arranged along the central line direction of the straight reinforcing steel bars (110), and two connecting pieces (140) which are correspondingly positioned at two ends of the straight reinforcing steel bars (110);
the straight ribs (110) comprise a top straight rib (101) positioned at the top of the Chinese character pin and two foot straight ribs (102) positioned at the bottom of the Chinese character pin;
the connecting pieces (140) are respectively matched with the two foot straight ribs (102);
the top of the support sheet (120) and the top straight rib (101) are completely exposed out of the precast concrete, and the bottom of the support sheet (120) and the foot straight rib (102) are poured in the precast concrete.
2. Laminated slab for assembly type buildings according to claim 1, characterized in that the support sheet (120) is provided with three first perforations (121) arranged in a "pinking" shape, corresponding to three straight ribs (110) one to one.
3. Laminated slab for prefabricated buildings according to claim 1, characterized in that it further comprises several sets of notches (200) correspondingly reserved at both ends of the precast concrete, said notches (200) being reserved at the connecting members (140).
4. A composite slab for prefabricated buildings according to claim 3, wherein the connecting piece (140) is provided with a U-shaped cross section with an inward opening, two second through holes (121 ') corresponding to the two straight foot ribs (102) are correspondingly formed in the sealing plate, the two second through holes (121') are respectively close to the side plates corresponding to the connecting piece (140), the sealing plate is further provided with bolt holes (141), and the notch (200) is located on the inner side of the sealing plate.
5. Laminated slab for prefabricated buildings according to claim 1, further comprising a plurality of auxiliary bars (150) arranged in a grid-like cross manner on the bar frames, and a frame (130) surrounding the precast concrete, wherein both ends of the straight bars (110) and both ends of the auxiliary bars (150) extend to the outside of the frame (130), and wherein both ends of the foot straight bars (102) and both ends of the auxiliary bars (150) extend through the frame (130).
6. A composite slab for prefabricated buildings according to claim 5, characterized in that said connecting element (140) is located inside said frame (130).
7. A composite slab for fabricated buildings according to claim 5, wherein the straight ribs (110) and the auxiliary ribs (150) are both made of screw steel, the diameter of the auxiliary ribs (150) is smaller than that of the straight ribs (110), and the diameter of the top straight ribs (101) is larger than that of the foot straight ribs (102).
8. Laminated slab for prefabricated buildings according to claim 5, characterized in that the top straight rib (101) is provided as an angle iron or a channel iron.
9. A composite slab for prefabricated buildings according to claim 5, characterized in that the top surface of the precast concrete is inlaid with several light modules (160).
10. A construction method using the composite slab for prefabricated buildings according to any one of claims 1 to 9, comprising the steps of:
step S1: prefabricating laminated slabs for prefabricated buildings;
step S2: placing the longitudinal two ends of the laminated slab prefabricated in the step S1 on corresponding beams, and sequentially placing a plurality of laminated slabs along the transverse direction;
step S3: supporting the lower parts of the plurality of superimposed sheets by using a supporting system, adjusting the flatness of the plurality of superimposed sheets, and plugging a splicing seam between two adjacent superimposed sheets by using a template to form a secondary concrete pouring space;
step S4: and pouring secondary concrete on the upper parts of the laminated slabs and the splicing seams, and tamping, trowelling and maintaining to finish the construction of the floor layer.
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