CN112983043B - Reinforcing method for simultaneously improving strength, rigidity and integrity of precast concrete hollow slab floor system - Google Patents
Reinforcing method for simultaneously improving strength, rigidity and integrity of precast concrete hollow slab floor system Download PDFInfo
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- CN112983043B CN112983043B CN202110380025.9A CN202110380025A CN112983043B CN 112983043 B CN112983043 B CN 112983043B CN 202110380025 A CN202110380025 A CN 202110380025A CN 112983043 B CN112983043 B CN 112983043B
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0288—Repairing or restoring floor slabs
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Abstract
The invention belongs to the field of building structure reinforcement, and provides a reinforcement method for simultaneously improving the strength, rigidity and integrity of a prefabricated concrete hollow slab floor, which is used for reinforcing the existing common prefabricated concrete hollow slab floor, particularly, a steel plate strip is chiseled and grooved at the bottom of the common prefabricated concrete hollow slab floor and embedded, a long screw is welded on the upper surface of the steel plate strip, a through hole is arranged at the position, corresponding to the long screw, on the concrete hollow slab, the long screw penetrates out of the through hole and then the steel plate strip is embedded into the bottom of the hollow slab floor, then a steel pipe is arranged on the upper surface of the hollow slab, the long screws simultaneously penetrate through the steel pipe and are connected by nuts, so that the hollow slab is reinforced, and adjacent hollow slabs are connected into a whole by connecting reinforcing steel plates on the corresponding long screws; the strength, rigidity and integrity of the precast concrete hollow slab obtained by adopting the reinforcing method are improved simultaneously, and the precast concrete hollow slab has the characteristics of convenience in reinforcing construction, excellent durability, simple process, less wet operation, labor saving and the like.
Description
Technical Field
The invention belongs to the field of building structure reinforcement, and particularly relates to a reinforcement method for simultaneously improving the strength, rigidity and integrity of a prefabricated concrete hollow slab floor.
Background
The precast concrete hollow slab has been used for decades in China, and has huge inventory in the existing buildings. In recent years, with the increasing load in the use process, part of the built civil buildings cannot meet the increasing use requirements due to the factors of low load standard, degradation of environment and structural performance and the like in the design process, diseases of different degrees occur, and serious hidden dangers are brought to the aspects of structural safety, durability and the like.
The reinforcement technology in the prior art is generally applied to large buildings such as bridges and the like, large equipment is needed, the construction period is long, the cost is high, and the reinforcement technology cannot be applied to reinforcement of old buildings; meanwhile, other existing reinforcing methods have large damage to old buildings, high cost and single reinforcing efficiency, and are difficult to popularize and apply better.
Therefore, the reinforcing method for improving the strength, rigidity and integrity of the existing precast concrete hollow slab floor system more simply and conveniently is provided, and the application of the reinforcing method to the reinforcement of old buildings is one of the problems to be solved in the field.
Disclosure of Invention
Aiming at various defects in the prior art, the invention provides a reinforcing method for simultaneously improving the strength, rigidity and integrity of a prefabricated concrete hollow slab floor, aiming at reinforcing the existing common prefabricated concrete hollow slab floor, in particular to a method for roughening and grooving the bottom of the common prefabricated concrete hollow slab floor and embedding a steel plate strip, wherein a long screw is welded on the upper surface of the steel plate strip, a through hole is formed in the concrete hollow slab corresponding to the long screw, the steel plate strip is embedded into the bottom of the hollow slab after the long screw penetrates out of the through hole, then a steel pipe is arranged on the upper surface of the hollow slab, the long screw penetrates through the steel pipe simultaneously and is connected by a nut, so that the hollow slab is reinforced, and adjacent hollow slabs are connected into a whole by connecting reinforcing steel plates on the corresponding long screw; the strength, rigidity and integrity of the precast concrete hollow slab obtained by adopting the reinforcing method can be simultaneously improved, and the precast concrete hollow slab has the characteristics of light weight, convenience in transportation and installation, excellent durability, simple process, less wet operation, labor conservation and the like. The ultimate bearing capacity and the bending rigidity of the reinforced precast concrete hollow slab are obviously improved compared with the unreinforced precast concrete hollow slab, the safety and the durability of the whole house can be met, and meanwhile, in the face of sudden disasters such as earthquakes, the earthquake resistance of the house can be greatly improved.
The specific technical scheme of the invention is as follows:
a reinforcement method for simultaneously improving the strength, rigidity and integrity of a precast concrete hollow slab floor is characterized in that the method is used for reinforcing the existing common precast concrete hollow slab floor, specifically, a roughening groove is formed in the bottom of the common precast concrete hollow slab floor and is embedded into a steel plate strip, a long screw is welded on the upper surface of the steel plate strip, a through hole is formed in the roughening groove of the concrete hollow slab corresponding to the long screw, the steel plate strip is embedded into the bottom of the hollow slab after the long screw penetrates out of the through hole, then a steel pipe is arranged on the upper surface of the hollow slab, the long screws penetrate through the steel pipe simultaneously and are connected through nuts, so that the hollow slab is reinforced, and adjacent hollow slabs are connected into a whole by connecting reinforcing steel plates on the corresponding long screws;
simultaneously, drilling a plurality of rows of holes on the upper surface of the hollow plate, wherein the holes are a grouting hole, a grout outlet hole and a plugging hole in sequence from the plate end to the plate center; the holes are communicated with the central hole of the hollow plate;
the concrete construction method comprises the following steps:
(1) firstly, cleaning the upper and lower surfaces of the existing common precast concrete hollow floor slab, and then chiseling and grooving the bottom of the concrete hollow floor slab, wherein when the number of the central holes of the concrete hollow floor slab is odd, the grooving position is below the central hole of the concrete hollow floor slab; when the number of the central holes of the concrete hollow slab is even, the slotting position is below two holes on the outermost side of the concrete hollow slab;
the hollow plate after being reinforced is more balanced in stress due to the arrangement, the original hollow plate is best in capability of bearing vertical surface load, and the anti-shearing effect of the plate body is better.
(2) After slotting is finished, selecting a steel plate strip with the size and the thickness suitable for the slotting groove body, uniformly welding long screws on the upper surface of the steel plate strip along the length direction of the steel plate strip, and then drilling through holes corresponding to the positions of the long screws in the slotting groove body, wherein the through holes penetrate through the whole concrete hollow slab; after cleaning the groove body, inserting the long screw rod into the through hole at the corresponding position and embedding the steel plate belt into the slotted groove body; preferably, the upper surface of the steel plate belt is coated with an adhesive, the adhesive is preferably an epoxy resin adhesive, so that the steel plate belt and the slotted groove body can be better attached together after being embedded in the slotted groove body, the bonding strength and the common working performance of the steel plate belt and the slotted groove body are improved, and preferably, the bottom surface of the steel plate belt is flush with the bottom surface of the concrete hollow slab after being embedded in the slotted groove body, so that the bottom surface of the concrete hollow slab is conveniently coated and decorated at a later stage;
(3) the long screw penetrates out of the upper surface of the concrete hollow slab and is firstly fastened by the nut, the fastening process is synchronous with the process of embedding the steel plate belt into the slotted groove body, and the steel plate belt can be better fixed; then, selecting a steel pipe with the length smaller than that of the concrete hollow slab, preferably adopting the steel pipe with the square section, drilling a hole corresponding to the long screw on the steel pipe, then sleeving the steel pipe on the long screw, and fastening the steel pipe and the long screw by using a nut to fixedly connect the steel pipe and the concrete hollow slab into a whole;
(4) after the operation is finished, the central hole of the concrete hollow slab is plugged and filled, and at least two ends of the central hole are completely sealed; the specific operation method comprises the following steps: firstly, filling foaming adhesive into the central part of a central hole through a plugging hole, wherein the filling amount is adjusted according to the size of the central hole, and preferably, only the central hole at the periphery of the plugging hole can be plugged; then completely closing the end part of the central hole by using a common gel material; finally, injecting high-strength and non-shrinkage grouting material into the central hole through the grouting hole until the grouting material overflows from the grout outlet hole, and indicating that the grouting material is filled in the central hole between the end part of the central hole and the foaming glue of the plugging port;
the adopted high-strength non-shrinkage grouting material is a cement-based grouting material commonly applied in the field of engineering reinforcement, and the inventor does not give details; and the central hole under the square steel pipe is not filled;
when a plurality of hollow plates need to be spliced, on the basis of the operation, before the steel pipe is placed in the step (3), a reinforced steel plate is placed on the long screw rods at the corresponding positions of the two adjacent hollow plates, through holes for the long screw rods to pass through are formed in the reinforced steel plate, the reinforced steel plate is placed on the nuts for fixing the long screw rods on the upper surface of the concrete hollow plate, and then the steel pipe is placed on the reinforced steel plate for subsequent fixing work; therefore, a plurality of hollow plates can be spliced into a whole; when the number of the holes of the concrete hollow slab is even, the reinforcing steel plate is only required to be arranged between the adjacent steel pipes on the outermost side of the adjacent concrete hollow slabs.
After the work is finished, concrete or light materials can be poured on the top of the common precast concrete hollow floor slab again as required until the top end of the long screw is covered, and the floor slab can be kept flat by adopting the mode, so that floor heating, floor and other decoration can be facilitated; in addition, concrete pouring can be directly performed in the steel pipe instead of the common precast concrete hollow floor slab top; the two modes can improve the rigidity of the common precast concrete hollow floor slab.
Compared with the prior art, the reinforcement method has the following beneficial effects:
(1) the bearing capacity of the in-service common precast concrete hollow slab floor can be obviously improved by fixing the steel pipes on the basis of the existing common precast concrete hollow slab; the detection shows that the ultimate bearing capacity of the reinforced precast concrete hollow slab is improved by more than 160 percent compared with the rigidity of the unreinforced precast concrete hollow slab, and the bending strength is improved by more than 300 percent.
(2) The common precast concrete hollow floor slab fixedly connected with the steel pipe is subjected to regional post-casting by adopting concrete and light materials, the rigidity of the precast concrete hollow floor slab can be improved, the weight of the reinforced concrete hollow floor slab can be reduced by using the light materials, and the precast concrete hollow floor slab has the characteristics of light weight, high rigidity, convenience in transportation and installation and the like.
(3) According to the use requirement of the precast concrete hollow slab, the post-casting can be carried out on the slab top, the steel pipe is subjected to grouting instead, the same effect can be achieved, and the rigidity of the precast concrete hollow slab can be improved.
(4) The slab end of the precast concrete hollow slab is filled with the special high-strength and non-shrinkage grouting material, the hollow holes at the slab end of the precast concrete hollow slab are tightly filled, and the shear-resistant bearing capacity of the slab end can be improved.
(5) The spliced seam between the precast concrete hollow slab and the slab is provided with the reinforced steel plate, so that the integrity of the precast concrete hollow slab can be improved.
Drawings
FIG. 1 is a schematic structural view of a reinforced precast concrete hollow slab obtained in example 1 of the present invention;
FIG. 2 is a structural sectional view of a reinforced precast concrete hollow panel obtained in example 1 of the present invention;
FIG. 3 is an enlarged view of the structure at A in FIG. 1;
FIG. 4 is a schematic structural view of the reinforced precast concrete hollow slabs obtained in example 1 of the present invention when they are spliced together;
FIG. 5 is a schematic structural view of a reinforced precast concrete hollow slab obtained in example 2 of the present invention;
FIG. 6 is a structural sectional view of a reinforced precast concrete hollow panel obtained in example 2 of the present invention;
FIG. 7 is an enlarged view of the structure at B in FIG. 5;
FIG. 8 is a schematic structural view of the reinforced hollow precast concrete slabs obtained in example 2 of the present invention when they are assembled with each other;
in the figure, 1 is a grouting hole, 2 is a grout outlet, 3 is a plugging hole, 4 is a precast concrete hollow slab, 5 is a steel pipe, 6 is a long screw rod, 7 is a nut, 8 is a steel plate strip, 9 is a central hole, 10 is an in-slab longitudinal rib, and 11 is a reinforced steel plate.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the following description of the embodiments of the invention without making any creative effort, shall fall within the protection scope of the present invention.
The high-strength non-shrinkage grouting material adopted in the following embodiment is a Kebite K50 universal cement-based high-strength non-shrinkage grouting material; other existing cement-based high-strength shrinkage-free grouting materials can also be selected.
Example 1
As shown in fig. 1-4, a reinforcing method for simultaneously improving the strength, rigidity and integrity of a precast concrete hollow slab floor system is provided, which is used for reinforcing the existing common precast concrete hollow slab floor system, wherein the common precast concrete hollow slab floor system is formed by pouring concrete, the cross section of the slab is made into a hollow concrete slab, a plurality of central holes 9 are formed in the slab, and the bottom of the slab is provided with in-slab longitudinal ribs 10; the method comprises the following steps of chiseling grooves at the bottoms of common precast concrete hollow floor slabs 4 and embedding steel plate strips 8, wherein long screws 6 are welded on the upper surfaces of the steel plate strips 8, through holes are formed in the chiseling grooves of the concrete hollow slabs corresponding to the long screws 6, the steel plate strips 8 are embedded into the bottoms of the hollow slabs 4 after the long screws 6 penetrate through the through holes, steel pipes 5 are arranged on the upper surfaces of the hollow slabs, the long screws 6 penetrate through the steel pipes 5 at the same time and are fixedly connected through nuts 7, and therefore the hollow slabs are reinforced, and adjacent hollow slabs are connected into a whole through connecting reinforcing steel plates 11 on the alignment long screws 6;
simultaneously, drilling a plurality of rows of holes on the upper surface of the hollow plate 4, wherein the holes are a grouting hole 1, a grout outlet hole 2 and a plugging hole 3 from the plate end to the plate center in sequence; the holes are communicated with a central hole 9 of the hollow plate 4;
the concrete construction method comprises the following steps:
(1) firstly, cleaning the upper surface and the lower surface of a common precast concrete hollow floor slab 4, and then chiseling and grooving at the bottom of the concrete hollow floor slab, wherein the number of central holes of the concrete hollow floor slab is 5 in the embodiment, and the grooving position is below the central hole of the concrete hollow floor slab;
(2) after grooving is finished, selecting a steel plate strip which is suitable for the size and the thickness of a grooving groove body, wherein the steel plate strip is 5mm thick, 80mm wide and the same as a hollow slab in length, uniformly welding long screws on the upper surface of the steel plate strip along the length direction of the steel plate strip, and then drilling through holes corresponding to the positions of the long screws in the grooving groove body, wherein the through holes penetrate through the whole precast concrete hollow slab; after cleaning the groove body, inserting the long screw rod into the through hole at the corresponding position and embedding the steel plate belt into the slotted groove body; the upper surface of the steel plate belt is coated with an adhesive which is an epoxy resin adhesive, so that the steel plate belt and the slotted groove body can be better attached together after being embedded into the slotted groove body, and the bonding strength and the common working performance of the steel plate belt and the slotted groove body are improved; after the steel plate strip is further arranged in the slotted groove body, the bottom surface of the steel plate strip is flush with the bottom surface of the concrete hollow slab, so that the bottom surface of the concrete hollow slab can be conveniently coated and decorated in the later period;
(3) the long screw penetrates out of the upper surface of the concrete hollow slab and is firstly fastened by the nut, the fastening process is synchronous with the process of embedding the steel plate belt into the slotted groove body, and the steel plate belt can be better fixed; then, selecting a steel pipe with a square section and a length smaller than that of the concrete hollow slab, drilling a hole corresponding to the long screw on the steel pipe, sleeving the steel pipe on the long screw, and fastening the steel pipe and the long screw by using a nut to fixedly connect the steel pipe and the concrete hollow slab into a whole;
(4) after the operation is finished, the central hole of the concrete hollow slab is plugged and filled, and at least two ends of the central hole are completely sealed; the specific operation method comprises the following steps: firstly, filling foaming adhesive into the central part of a central hole through a plugging hole, wherein the filling amount is adjusted according to the size of the central hole, and preferably, only the central hole at the periphery of the plugging hole can be plugged; then completely closing the end part of the central hole by using a common gel material; finally, injecting high-strength and non-shrinkage grouting material into the central hole through the grouting hole until the grouting material overflows from the grout outlet hole, and indicating that the grouting material is filled in the central hole between the end part of the central hole and the foaming glue of the plugging port;
when adjacent hollow plates are spliced, on the basis of the operation, before the steel pipes are placed in the step (3), the reinforced steel plates are placed on the long screws at the corresponding positions of the two adjacent hollow plates, through holes for the long screws to pass through are formed in the reinforced steel plates, the reinforced steel plates are placed on nuts for fixing the long screws on the upper surfaces of the concrete hollow plates, and then the steel pipes are placed on the reinforced steel plates for subsequent fixing work; therefore, a plurality of hollow plates can be spliced into a whole;
the bending rigidity of the reinforced precast concrete hollow floor slab can be improved by more than 20%, and the ultimate bearing capacity can be improved by more than 130%.
After the work is finished, concrete or light materials can be poured on the top of the common precast concrete hollow floor slab again according to needs until the top end of the long screw rod is covered; after the steel pipes are fixed and concrete is poured on the top of the concrete hollow floor slab again, compared with the ordinary precast concrete hollow floor slab which is not reinforced, the bending rigidity of the steel pipes can be improved by more than 45 percent, and the ultimate bearing capacity can be improved by more than 200 percent.
Example 2
As shown in fig. 5-8, a reinforcing method for simultaneously improving the strength, rigidity and integrity of a precast concrete hollow slab floor system is provided, which is used for reinforcing the existing common precast concrete hollow slab floor system, wherein the common precast concrete hollow slab floor system is formed by pouring concrete, the cross section of the slab is made into a hollow concrete slab, a plurality of central holes 9 are formed in the slab, and the bottom of the slab is provided with in-slab longitudinal ribs 10; the method comprises the following steps of chiseling grooves at the bottoms of common precast concrete hollow floor slabs 4 and embedding steel plate strips 8, wherein long screws 6 are welded on the upper surfaces of the steel plate strips 8, through holes are formed in the chiseling grooves of the concrete hollow slabs corresponding to the long screws 6, the steel plate strips 8 are embedded into the bottoms of the hollow slabs 4 after the long screws 6 penetrate through the through holes, steel pipes 5 are arranged on the upper surfaces of the hollow slabs, the long screws 6 penetrate through the steel pipes 5 at the same time and are fixedly connected through nuts 7, and therefore the hollow slabs are reinforced, and adjacent hollow slabs are connected into a whole through connecting reinforcing steel plates 11 on the corresponding long screws 6;
simultaneously, drilling a plurality of rows of holes on the upper surface of the hollow plate 4, wherein the holes are a grouting hole 1, a grout outlet hole 2 and a plugging hole 3 from the plate end to the plate center in sequence; the holes are communicated with a central hole 9 of the hollow plate 4; the concrete construction method comprises the following steps:
(1) firstly, cleaning the upper surface and the lower surface of a common precast concrete hollow floor slab 4, and then chiseling and grooving at the bottom of the concrete hollow slab, wherein the number of central holes of the concrete hollow slab is 6, and the grooving position is below two holes at the outermost side of the concrete hollow slab;
(2) after grooving is finished, selecting a steel plate strip which is suitable for the size and the thickness of a grooving groove body, wherein the steel plate strip is 5mm thick, 80mm wide and the same as a hollow slab in length, uniformly welding long screws on the upper surface of the steel plate strip along the length direction of the steel plate strip, and then drilling through holes corresponding to the positions of the long screws in the grooving groove body, wherein the through holes penetrate through the whole concrete hollow slab; after cleaning the groove body, inserting the long screw rod into the through hole at the corresponding position and embedding the steel plate belt into the slotted groove body; the upper surface of the steel plate belt is coated with an adhesive which is an epoxy resin adhesive, so that the steel plate belt and the slotted groove body can be better attached together after being embedded into the slotted groove body, and the bonding strength and the common working performance of the steel plate belt and the slotted groove body are improved; after the steel plate strip is further arranged in the slotted groove body, the bottom surface of the steel plate strip is flush with the bottom surface of the concrete hollow slab, so that the bottom surface of the concrete hollow slab can be conveniently coated and decorated in the later period;
(3) the long screw penetrates out of the upper surface of the concrete hollow slab and is firstly fastened by the nut, the fastening process is synchronous with the process of embedding the steel plate belt into the slotted groove body, and the steel plate belt can be better fixed; then, selecting a steel pipe with a square section and a length smaller than that of the concrete hollow slab, drilling a hole corresponding to the long screw on the steel pipe, sleeving the steel pipe on the long screw, and fastening the steel pipe and the long screw by using a nut to fixedly connect the steel pipe and the concrete hollow slab into a whole;
(4) after the operation is finished, the central hole of the concrete hollow slab is plugged and filled, and at least two ends of the central hole are completely sealed; the specific operation method comprises the following steps: firstly, filling foaming adhesive into the central part of a central hole through a plugging hole, wherein the filling amount is adjusted according to the size of the central hole, and preferably, only the central hole at the periphery of the plugging hole can be plugged; then completely closing the end part of the central hole by using a common gel material; finally, injecting high-strength and non-shrinkage grouting material into the central hole through the grouting hole until the grouting material overflows from the grout outlet hole, and indicating that the grouting material is filled in the central hole between the end part of the central hole and the foaming glue of the plugging port;
when adjacent hollow plates are spliced, on the basis of the operation, before the steel pipe is placed in the step (3), a reinforcing steel plate is placed on the long screw rod at the adjacent corresponding position on the outermost side of the adjacent concrete hollow plate, a through hole for the long screw rod to pass through is formed in the reinforcing steel plate, the reinforcing steel plate is placed on a nut for fixing the long screw rod on the upper surface of the concrete hollow plate, and then the steel pipe is placed on the reinforcing steel plate for subsequent fixing work; therefore, a plurality of hollow plates can be spliced into a whole;
detected under the same loading condition (2.5 kN/m)2) The midspan downward deflection of the precast concrete hollow floor slab before reinforcement is 2.70mm, after the reinforcement work, the midspan vertical deformation of the precast concrete hollow floor slab is only 1.03mm, the bending rigidity is obviously improved, the ultimate bearing capacity can also be improved by nearly 300%, and after the ultimate bearing capacity is exceeded, the number of cracks appearing on the floor slab is obviously reduced compared with that of the cracks which are not reinforced, and the width of the cracks is obviously smaller.
The foregoing is only a preferred embodiment of the present invention; the scope of the invention is not limited thereto. Any person skilled in the art should be able to cover the technical scope of the present invention by equivalent or modified solutions and modifications within the technical scope of the present invention.
Claims (8)
1. The utility model provides a reinforcing method of improving precast concrete hollow slab superstructure intensity, rigidity and wholeness simultaneously, concrete is consolidated to current ordinary precast concrete hollow slab, its characterized in that: the method comprises the following steps that a steel plate strip is embedded in a chiseling groove in the bottom of a common precast concrete hollow floor slab, a long screw is welded on the upper surface of the steel plate strip, a through hole is formed in the chiseling groove of the concrete hollow slab in a position corresponding to the long screw, the long screw penetrates out of the through hole and then is embedded into the bottom of the hollow slab, a steel pipe is arranged on the upper surface of the hollow slab, the long screw penetrates through the steel pipe simultaneously and then is connected through a nut to complete reinforcement of the hollow slab, and adjacent hollow slabs are connected into a whole through connecting reinforcing steel plates on the corresponding long screws; simultaneously, drilling a plurality of rows of holes on the upper surface of the hollow plate, wherein the holes are a grouting hole, a grout outlet hole and a plugging hole in sequence from the plate end to the plate center; the holes are communicated with the central hole of the hollow plate;
the concrete construction steps are as follows:
(1) firstly, cleaning the upper and lower surfaces of the existing common precast concrete hollow floor slab, and then chiseling and grooving the bottom position of the concrete hollow floor slab;
(2) after slotting is finished, selecting a steel plate strip with the size and the thickness suitable for the slotting groove body, uniformly welding long screws on the upper surface of the steel plate strip along the length direction of the steel plate strip, and then drilling through holes corresponding to the positions of the long screws in the slotting groove body, wherein the through holes penetrate through the whole concrete hollow slab; after cleaning the groove body, inserting the long screw rod into the through hole at the corresponding position and embedding the steel plate belt into the slotted groove body;
(3) the long screw penetrates out of the upper surface of the concrete hollow slab and is firstly fastened by using a nut, and the fastening process is synchronous with the process of embedding the steel plate strip into the slotted groove body; then, selecting a steel pipe with the length slightly smaller than that of the concrete hollow slab, drilling a hole corresponding to the position of the long screw rod on the steel pipe, sleeving the steel pipe on the long screw rod, and fastening the steel pipe and the long screw rod by using a nut to fixedly connect the steel pipe and the concrete hollow slab into a whole;
(4) after the operation is finished, the central hole of the concrete hollow slab is plugged and filled, and at least two ends of the central hole are completely sealed; the specific operation method comprises the following steps: firstly, filling foaming glue into the central part of a central hole through a plugging hole; then completely closing the end part of the central hole by using a common gel material; and finally, injecting high-strength and non-shrinkage grouting material into the central hole through the grouting hole until the grouting material overflows from the grout outlet hole.
2. The reinforcing method for simultaneously improving the strength, the rigidity and the integrity of the precast concrete hollow slab floor system according to claim 1, is characterized in that: in the step (1), when the number of the central holes of the concrete hollow slab is odd, the slotting position is below the central hole of the concrete hollow slab; when the number of the central holes of the concrete hollow slab is even, the grooving positions are positioned below the two holes on the outermost side of the concrete hollow slab.
3. The reinforcing method for simultaneously improving the strength, the rigidity and the integrity of the precast concrete hollow slab floor system according to claim 1, is characterized in that: in the step (2), an adhesive is coated on the upper surface of the steel plate belt, and the adhesive is an epoxy resin adhesive; after the steel plate strip is arranged in the slotted groove body, the bottom surface of the steel plate strip is flush with the bottom surface of the concrete hollow slab.
4. The reinforcing method for simultaneously improving the strength, the rigidity and the integrity of the precast concrete hollow slab floor system according to claim 1, is characterized in that: and (3) adopting a steel pipe with a square cross section.
5. The reinforcing method for simultaneously improving the strength, the rigidity and the integrity of the precast concrete hollow slab floor system according to claim 1, is characterized in that: and (4) filling foaming adhesive into the central part of the central hole through the plugging hole, wherein the filling amount is adjusted according to the size of the central hole, and only the central hole at the periphery of the plugging hole is plugged.
6. The reinforcing method for simultaneously improving the strength, the rigidity and the integrity of the precast concrete hollow slab floor system according to claim 1, is characterized in that: the high-strength non-shrinkage grouting material in the step (4) is a cement-based grouting material.
7. The reinforcing method for simultaneously improving the strength, the rigidity and the integrity of the precast concrete hollow slab floor system according to claim 1, is characterized in that: when the hollow plates of polylith need be spliced, before placing the steel pipe in step (3), place the reinforcing steel plate on the long screw rod that two adjacent hollow plates correspond the position, be provided with the through-hole that makes things convenient for the long screw rod to pass on the reinforcing steel plate, and the reinforcing steel plate is placed on the nut that the hollow plate upper surface of concrete is used for fixed long screw rod, later places the steel pipe on the reinforcing steel plate again, carries out subsequent fixed work.
8. The reinforcing method for simultaneously improving the strength, the rigidity and the integrity of the precast concrete hollow slab floor system according to claim 1, is characterized in that: the method also comprises the steps of pouring concrete or light materials on the top of the reinforced common precast concrete hollow floor slab again until the top end of the long screw rod is covered; or directly grouting the steel pipe.
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|---|---|---|---|---|
| JP3837129B2 (en) * | 2003-07-31 | 2006-10-25 | 株式会社竹中工務店 | Slab reinforcement method |
| RU2347047C2 (en) * | 2006-11-21 | 2009-02-20 | Государственное образовательное учреждение высшего профессионального образования "Самарский государственный архитектурно-строительный университет" (СГАСУ) | Method for building floor panel reconstruction |
| CN104060849A (en) * | 2014-07-05 | 2014-09-24 | 刘广义 | Punching, stacking and reinforcing method of concrete hollow slab |
| CN106468104A (en) * | 2016-09-07 | 2017-03-01 | 西安建筑科技大学 | A kind of steel fiber reinforced concrete and its construction method reinforcing precast floor slab |
| CN210622361U (en) * | 2019-05-16 | 2020-05-26 | 苏州鑫精和装配式建筑产业有限公司 | Reinforced structure between two adjacent prefabricated floor slabs |
-
2021
- 2021-04-08 CN CN202110380025.9A patent/CN112983043B/en active Active
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| CN112983043A (en) | 2021-06-18 |
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