Prestressed full-precast waterproof plate connecting joint and construction method thereof

Abstract

The application discloses a prestressed full-precast waterproof plate connecting joint and a construction method thereof, and belongs to the technical field of precast plates. The prestressed full-precast waterproof plate connecting joint comprises a full-precast floor slab and a cast-in-place beam. The full-precast floor slab comprises bottom steel bars and surface steel bars. The bottom steel bars are arranged inside the bottom surface of the full-precast floor slab, and the surface steel bars are arranged inside the upper surface of the full-precast floor slab. The bottom steel bars and the surface steel bars extend out of the plate end. The full-precast floor slab is further provided with a lug. The lug, the surface steel bars and the bottom steel bars of the full-precast floor slab all extend into the range of the cast-in-place beam. A water-stopping steel plate is further arranged on the lug. The prestressed full-precast waterproof plate connecting joint and the construction method thereof solve the problems of the prior art. The prestressed full-precast waterproof plate connecting joint and the construction method thereof increase the water infiltration path by arranging the lug, the water-stopping steel plate prevents the water from directly infiltrating downwards, the construction speed is high, the floor slab is free of formwork, there is no on-site wet work, and the construction quality is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of prefabricated slab, in particular to a prestressed full prefabricated waterproof slab connecting node and a construction method thereof. BACKGROUND

[0002] The assembled building structure has the advantages of low energy consumption, environmental protection, short construction period, high production quality and the like. The assembled component is generally divided into two types, i.e., full assembled component and post-poured integral component. The former is prone to damage at the joint, although it has a short construction period. Therefore, how to efficiently assemble the component while improving the bearing capacity and rigidity of the slab connecting node has been a research direction of scholars and engineers.

[0003] With the continuous acceleration of industrialization process and the continuous improvement of sustainable development requirements in China, the application range of the assembled component is continuously expanding. At present, the prefabricated slab is rarely applied in the kitchen, bathroom and balcony. The main reasons are as follows: 1. the connection between the prefabricated slab and the beam is prone to cracking; 2. the kitchen and bathroom floor has small rigidity, and the deformation within a reasonable range causes cracks in the building waterproof layer; and 3. wet work is required on site, and the cost performance of the small-area composite slab is low, and the replaceability is high.

[0004] Therefore, it is of great significance and broad prospects to provide a connecting node with good bearing capacity and rigidity, excellent waterproof performance and convenient construction for the prefabrication of the kitchen and bathroom slab in the residence.

[0005] A prefabricated slab connecting node for high-rise buildings is disclosed in Chinese Patent No. CN205976010U, which comprises two prefabricated slabs that are spliced with each other. A plurality of nuts embedded in the prefabricated slabs are symmetrically arranged at the splicing positions of the two prefabricated slabs. The edge of at least one prefabricated slab is provided with a recess, the recess is in communication with the nuts at the splicing position of the prefabricated slab, and a bolt is fixedly connected with the nuts at the splicing position of the other prefabricated slab through the nuts in the recess. Two sealing plates are arranged on both sides of the splicing surface of the two prefabricated slabs, and concrete is poured in the enclosed area surrounded by the two sealing plates and the splicing surface of the two prefabricated slabs. Although the prefabricated slab connecting node for high-rise buildings provided by the utility model has the advantages of simple connection mode, convenient and fast operation, and wet work can be performed in the area connected by the prefabricated slabs, the connection between the prefabricated slabs has strong connection strength, and can be used for high-rise building construction, the waterproof performance is general, and wet work is still required on site, and the replaceability is high. SUMMARY

[0006] The present application aims to provide a prestressed full prefabricated waterproof slab connecting node and a construction method thereof, which solves the problems in the background art by arranging the corbels, the water-stopping steel plate and the grouting steel plate.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0008] The prestressed full-precast waterproof slab connecting joint comprises a full-precast floor slab and a cast-in-place beam, the full-precast floor slab comprises bottom steel bars and surface steel bars, the bottom steel bars are arranged inside the bottom surface of the full-precast floor slab, the surface steel bars are arranged inside the upper surface of the full-precast floor slab, the bottom steel bars and the surface steel bars are arranged outside the slab end, the full-precast floor slab end is further provided with a lug, the lug, the surface steel bars and the bottom steel bars of the full-precast floor slab are all arranged in the cast-in-place beam range, and a water-stop steel plate is further arranged on the lug.

[0009] Preferably, a step is arranged on the upper surface of the lug, the water-stop steel plate is arranged on the step, one end of the water-stop steel plate is arranged in the full-precast floor slab, and the width of the water-stop steel plate exceeds the beam edge.

[0010] Preferably, the lug is arranged on the cast-in-place beam, the cross section of the water-stop steel plate is determined according to the span and load of the full-precast floor slab, the bottom steel bars are arranged outside the length of 1 / 2 of the cast-in-place beam width, the surface steel bars are arranged outside the length of 1 / 2 of the cast-in-place beam width, the surface steel bars are bent downward after being greater than 0.35 times the anchoring length, and the length of the surface steel bars bent downward is greater than 2 times the steel bar diameter.

[0011] Preferably, prestressed steel bars are arranged in the lug of the full-precast floor slab, the prestressed steel bars are arranged below the water-stop steel plate and avoid the self steel bars of the full-precast floor slab, and the prestressed steel bars do not increase the thickness of the full-precast floor slab.

[0012] Preferably, a grouting steel plate is further arranged in the cast-in-place beam, the grouting steel plate and the water-stop steel plate are welded and connected into an L shape, the water-stop steel plate is provided with exhaust holes with a diameter of 20 mm at intervals of 50 cm, the grouting steel plate is provided with grouting holes with a diameter of 20 mm at intervals of 50 cm, and graded sand and gravel with a particle size of 5-20 mm are arranged in the A area below the water-stop steel plate.

[0013] Preferably, the grouting holes are used for grouting, the grouting pressure is controlled to be 0.5-3 Mpa, the exhaust holes of the water-stop steel plate are used for observing the grouting condition to determine the stopping time of grouting, and the quick-setting grout used for grouting further contains fibers.

[0014] Preferably, the water-stop steel plate and the grouting steel plate are closed by welding, the grouting holes are blocked by using sealing fillers, a layer of self-adhesive modified asphalt waterproof coiled material is laid on the exhaust holes of the water-stop steel plate, the range of the coiled material exceeds the edge of the exhaust holes by 200 mm, then a cement-based permeable crystalline waterproof coating is brushed on the water-stop steel plate, and a concrete surface layer is poured on the waterproof coating.

[0015] Another technical problem to be solved by the present application is to provide a construction method of the prestressed full-precast waterproof slab connecting joint.

[0016] S1: Reserving linear prestressed ducts in the span direction of the full-precast floor, adopting post-tensioning construction technology, one end fixed and one end tensioned mode;

[0017] S2: The full-precast floor support steel bars are ramped at a ratio of 1:6 near the support, are passed out at the end of the eaves under the step, the water stop steel plate is placed on the upper surface of the full-precast floor, and the length of the water stop steel plate extending into the plate exceeds 50 mm of the b surface;

[0018] S3: After the full-precast floor is placed, the graded sand and gravel with a particle size of 5-20 mm is placed under the water stop steel plate, and the sand and gravel surface is sprayed with water to be wet;

[0019] S4: The grouting steel plate is vertically buried in the cast-in-place beam, and the water stop steel plate and the grouting steel plate are connected by welding;

[0020] S5: The fast-setting slurry is injected into the grouting hole of the grouting steel plate in a pressure grouting mode, the grouting pressure is controlled to be 0.5-3 Mpa, so that the compactness and stress performance of the concrete are ensured, and the grouting is stopped when the cement slurry is all discharged from the exhaust hole of the water stop steel plate;

[0021] S6: The grouting hole is cleaned, the grouting hole is sealed by using sealing filler, the exhaust hole is paved with a layer of self-adhesive modified asphalt waterproof roll material, the roll material range exceeds the edge of the exhaust hole by 200 mm, then the cement-based permeable crystalline waterproof coating is brushed on the steel plate, and finally the concrete surface layer is poured on the waterproof coating.

[0022] Compared with the prior art, the prestressed full-precast waterproof plate connecting node and the construction method thereof have the advantages that the waterproof capacity is high, the eaves increase the water seepage path, the water stop steel plate prevents water from directly seeping downward, the construction speed is fast, the floor is free of formwork, there is no on-site wet operation, the construction quality is high, the eaves are produced by using aluminum film or steel film in the factory, the surface is smooth and has no angle, the bearing capacity is high, the eaves on the side of the full-precast floor can improve the integrity of the full-precast concrete and the cast-in-place concrete, the rigidity is large, the prestressed steel bars are arranged in the span direction, the deformation of the floor is effectively controlled, and the waterproof layer is prevented from being damaged due to the deformation of the floor. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a prestressed full-precast waterproof plate connecting node diagram of the application;

[0024] Figure 2 It is a full-precast floor diagram of the application;

[0025] Figure 3 It is a roughened surface schematic diagram of the full-precast floor of the application;

[0026] Figure 4 It is a water stop steel plate diagram of the application;

[0027] Figure 5 Figure of the water stop steel plate after laying the waterproof roll material of the present application;

[0028] Figure 6 Figure of the grouting steel plate of the present application.

[0029] In the figure: 1, full-precast floor slab; 11, bottom steel bar of the slab; 12, surface steel bar of the slab; 13, lug; 131, step; 14, prestressed steel bar; 3, water stop steel plate; 31, exhaust hole; 4, grouting steel plate; 41, grouting hole. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present application.

[0031] To solve the existing problems, please refer to Figure 1 and Figure 2 The technical solutions provided by the embodiments are as follows:

[0032] A prestressed full-precast waterproof floor slab connecting joint comprises a full-precast floor slab 1 and a cast-in-place beam. The bottom steel bar 11 and the surface steel bar 12 of the full-precast floor slab 1 extend out of the slab end. The end of the full-precast floor slab 1 is provided with a lug 13. A step 131 is arranged on the upper surface of the lug 13. A water stop steel plate 3 is placed on the step 131 and extends into the full-precast floor slab 1. The width of the water stop steel plate 3 exceeds the beam edge. The lug 13, the surface steel bar 12 and the bottom steel bar 11 of the full-precast floor slab 1 all extend into the cast-in-place beam. After pouring concrete, the full-precast floor slab 1 and the cast-in-place beam form an integral whole.

[0033] The five contact surfaces of the full-precast floor slab 1 and the cast-in-place beam all need to be chiseled. The lug 13 is placed on the cast-in-place beam, which strengthens the bonding force of the precast concrete and the cast-in-place concrete. At the same time, the lug 13 prolongs the water infiltration path at the beam-slab joint. The maximum shear force position of the simply supported slab is at the support. The lug 13 is additionally provided with the water stop steel plate 3, which can prevent water from directly infiltrating after cracks are generated at the beam edge. During the construction stage, the lug 13 is placed on the cast-in-place beam, avoiding the erection of a formwork. Under the joint action of the lug 13 and the water stop steel plate 3, the formed joint has the characteristics of high integrity, excellent waterproof performance and convenient construction.

[0034] The section of the water stop steel plate 3 is determined according to the span and load of the full-precast floor slab 1, so that the eaves 13 have good bending and shearing capacity, the full-precast floor slab 1 has a length of the steel bar 11 extending out of the full-precast floor slab 1 by more than 1 / 2 of the width of the cast-in-place beam, and the full-precast floor slab 1 has a length of the steel bar 12 extending out of the full-precast floor slab 1 by more than 1 / 2 of the width of the cast-in-place beam and more than 0.35 times the anchoring length, and the steel bar 12 is bent downward by more than 15 times the diameter of the steel bar.

[0035] Linear prestressed ducts are reserved in the main span direction of the full-precast floor slab 1, and the post-tensioning construction process is adopted, one end is fixed and one end is tensioned, the number and spacing of the prestressed steel bars 14 are determined according to the span and load of the full-precast floor slab 1, the deflection of the full-precast floor slab 1 is controlled within the allowable deformation of the waterproof material in the design working life, the prestressed steel bars 14 are arranged in the eaves 13 of the full-precast floor slab 1 and are located below the water stop steel plate 3 to avoid the steel bars of the full-precast floor slab 1, and the thickness of the full-precast floor slab 1 is not increased.

[0036] Please refer to Figure 1 , Figure 4 and Figure 6 , the water stop steel plate 3 is provided with exhaust holes 31 with a diameter of 20 mm at intervals of 50 cm, the grouting steel plate 4 is provided with grouting holes 41 with a diameter of 20 mm at intervals of 50 cm, the grouting steel plate 4 is embedded in the cast-in-place beam and is welded to the water stop steel plate 3 to form an L shape on site. The graded sand and gravel with a particle size of 5-20 mm is placed under the water stop steel plate 3 as the aggregate of the concrete in the A area.

[0037] The fast-setting grout is injected into the grouting holes 41 of the grouting steel plate 4 by using the pressure grouting method, the grouting pressure is controlled to be 0.5-3 MPa, so as to ensure the compactness and stress performance of the concrete, and the grouting is stopped when the cement slurry in the exhaust holes 31 of the water stop steel plate 3 all comes out.

[0038] The fast-setting grout is mixed with fibers, such as steel fibers and carbon fibers, which have excellent mechanical properties, so that the concrete in the A area has good crack resistance and tensile properties and overcomes the defects of ordinary concrete, such as easy cracking and brittle failure.

[0039] Please refer to Figures 1-6 , after the water stop steel plate 3 and the grouting steel plate 4 are welded and closed, the grouting guide pipe is removed, the grouting holes 41 are sealed by using sealing fillers, the exhaust holes 31 of the water stop steel plate 3 are paved with a layer of self-adhesive modified asphalt waterproof roll material, the range of the roll material needs to exceed the edge of the exhaust holes 31 by 200 mm, then the cement-based permeable crystalline waterproof coating is brushed on the water stop steel plate 3, and the concrete surface layer is poured on the waterproof coating.

[0040] In order to better show the operation process of the present application, the present embodiment proposes a prestressed full-precast waterproof plate connecting joint implementation method, which comprises the following steps:

[0041] Step one: linear prestressed duct is reserved in the main span direction of the full-precast floor 1, and the post-tensioning construction process is adopted, and one end is fixed and one end is tensioned.

[0042] Step two: the support steel bar of the full-precast floor 1 is sloped at a ratio of 1:6 near the support, is threaded out at the end of the eaves 13 under the step 131, the water stop steel plate 3 is placed on the upper surface of the full-precast floor 1, and the length of the water stop steel plate 3 extending into the plate exceeds 50mm of the b surface.

[0043] Step three: after the full-precast floor 1 is placed, the graded sand and gravel with a particle size of 5-20mm is placed under the water stop steel plate 3, and the sand and gravel surface is sprayed with water.

[0044] Step four: the grouting steel plate 4 is vertically buried in the cast-in-place beam, and the water stop steel plate 3 and the grouting steel plate 4 are connected by welding.

[0045] Step five: the quick-setting grout is injected into the grouting hole 41 of the grouting steel plate 4 in a pressure grouting mode, the grouting pressure is controlled to be 0.5-3Mpa, so that the compactness and stress performance of the concrete are ensured, and the grouting is stopped when the cement slurry in the exhaust hole 31 of the water stop steel plate 3 is all discharged.

[0046] Step six: the grouting hole is cleaned, the grouting hole 41 is sealed by using sealing filler, the exhaust hole 31 is paved with a layer of self-adhesive modified asphalt waterproof roll material, the roll material range needs to exceed the edge of the exhaust hole 31 by 200mm, then cement-based penetrating crystalline waterproof coating is brushed on the steel plate, and the concrete surface layer is poured on the waterproof coating.

[0047] As described above: compared with the existing precast slab and beam connection node, the prestressed full-precast waterproof plate connection node and the implementation method thereof have strong waterproof capacity, the water seepage path is increased by arranging the eaves 13, the water stop steel plate 3 prevents water from directly seeping, the construction speed is fast, the floor is free from formwork, there is no on-site wet operation, the construction quality is high, the eaves 13 is produced by using aluminum film or steel film in the factory, the surface is smooth and has no angle, the bearing capacity is high, the eaves 13 at the side edge of the full-precast floor 1 can improve the integrity of the full-precast floor 1 and the cast-in-place beam, the stiffness is large, the prestressed steel bar 14 is arranged in the span direction, the deformation of the full-precast floor 1 is effectively controlled, and the waterproof layer is prevented from being damaged due to deformation of the full-precast floor 1.

[0048] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting; it is not intended to exclude myriad other embodiments of the present application that other inventors can develop based on the same general inventive concepts embodied by the described embodiments. That is, although the present application is described in terms of particular embodiments and illustrative figures, it should be apparent that the scope of the present application is not limited to these specific embodiments.

[0049] While the embodiments of the application have been shown and described herein, it will be understood by those skilled in the art that many changes, modifications, substitutions and alterations to these embodiments can be made without departing from the principles and spirits of the application, and it is intended that the scope of the application be limited solely by the scope of the appended claims and the equivalents thereof.

Claims

1. A prestressed full-precast waterproof slab connecting joint, comprising a full-precast floor slab (1) and a cast-in-place beam, the full-precast floor slab (1) comprising a slab bottom steel bar (11) and a slab surface steel bar (12), characterized in that: The plate bottom steel bar (11) is arranged inside the bottom surface of the full-precast floor slab (1), the plate surface steel bar (12) is arranged inside the upper surface of the full-precast floor slab (1), the plate bottom steel bar (11) and the plate surface steel bar (12) are extended out of the plate end, the full-precast floor slab (1) is further provided with a corbel (13), the corbel (13), the plate surface steel bar (12) and the plate bottom steel bar (11) of the full-precast floor slab (1) are all extended into the cast-in-place beam range, and the corbel (13) is further provided with a water-stop steel plate (3); The corbel (13) is provided with a step (131) on the upper surface, the water-stop steel plate (3) is arranged on the step (131), one end of the water-stop steel plate (3) is extended into the full-precast floor slab (1), and the width of the water-stop steel plate (3) exceeds the beam edge; the corbel (13) is arranged on the cast-in-place beam, the cross section of the water-stop steel plate (3) is determined according to the span and load of the full-precast floor slab (1), the plate bottom steel bar (11) is extended out of the cast-in-place beam by a length greater than 1 / 2 of the width of the cast-in-place beam, the plate surface steel bar (12) is extended out of the cast-in-place beam by a length greater than 1 / 2 of the width of the cast-in-place beam, and the plate surface steel bar (12) is bent downward after being greater than 0.35 times the anchoring length, and the downward bending length of the plate surface steel bar (12) is greater than 15 times the diameter of the steel bar; The corbel (13) of the full-precast floor slab (1) is provided with a prestressed steel bar (14) arranged below the water-stop steel plate (3) to avoid the steel bar of the full-precast floor slab (1) itself, and the prestressed steel bar (14) does not increase the thickness of the full-precast floor slab (1); the cast-in-place beam is further provided with a grouting steel plate (4), the grouting steel plate (4) and the water-stop steel plate (3) are connected by a welding seam to form an L shape, the water-stop steel plate (3) is provided with exhaust holes (31) with a diameter of 20 mm at intervals of 50 cm, the grouting steel plate (4) is provided with grouting holes (41) with a diameter of 20 mm at intervals of 50 cm, and graded sand with a particle size of 5-20 mm is arranged in the area surrounded by the water-stop steel plate (3), the grouting steel plate (4), the corbel (13) and the cast-in-place beam.

2. The pre-stressed full-precast waterproofing slab connection joint according to claim 1, characterized in that: The grouting holes (41) are used for grouting, the grouting pressure is controlled to be 0.5-3 Mpa, the exhaust holes (31) of the water-stop steel plate (3) are used for observing the grouting condition to determine the stopping time of grouting, and the quick-setting slurry used for grouting further contains fibers.

3. The pre-stressed full-precast waterproofing slab connection node according to claim 2, characterized in that: The water-stop steel plate (3) and the grouting steel plate (4) are closed by welding, the grouting holes (41) are blocked by using sealing fillers, a layer of self-adhesive modified asphalt waterproof roll material is laid on the exhaust holes (31) of the water-stop steel plate (3), the range of the roll material exceeds the edge of the exhaust holes (31) by 200 mm, then a cement-based permeable crystalline waterproof coating is brushed on the water-stop steel plate (3), and a concrete surface layer is poured on the waterproof coating.

4. The construction method of the prestressed full-precast waterproof board connecting joint as claimed in claim 3, characterized in that, The method comprises the following steps: S1: reserving a linear prestress duct in the span direction of the full-precast floor slab (1), and adopting a post-tensioning construction process in a fixed-end tensioning mode; S2: The steel bars of the full-precast floor slab (1) are sloped at a ratio of 1:6 near the support, and are passed out at the end of the eaves (13) under the step (131). The water-stop steel plate (3) is placed on the upper surface of the step (131) of the full-precast floor slab (1), and the length of the water-stop steel plate (3) extending into the slab exceeds the contact surface of the eaves (13) and the cast-in-place beam by 50 mm; S3: After the full-precast floor slab (1) is placed, the graded sand and gravel with a particle size of 5-20 mm is placed under the water-stop steel plate (3), and the sand and gravel surface is sprayed with water to be wet; S4: The grouting steel plate (4) is vertically buried in the cast-in-place beam, and the water-stop steel plate (3) and the grouting steel plate (4) are connected by welding; S5: The fast-setting grout is injected into the grouting hole (41) of the grouting steel plate (4) by pressure grouting, and the grouting pressure is controlled at 0.5-3 Mpa to ensure the compactness and stress performance of the concrete. When all the exhaust holes (31) of the water-stop steel plate (3) have cement slurry coming out, the grouting is stopped; S6: The grouting hole (41) is sealed with sealing filler, the exhaust hole (31) is paved with a layer of self-adhesive modified asphalt waterproof roll material, the roll material range exceeds the edge of the exhaust hole (31) by 200 mm, then the cement-based permeable crystalline waterproof coating is brushed on the steel plate, and finally the concrete surface layer is poured on the waterproof coating.

Images