Reinforcing method of concrete floor

Abstract

The invention discloses a concrete floor reinforcing method which comprises the following steps that a reinforcing area is selected on the top face of a concrete floor, a groove is formed in the reinforcing area, a plurality of embedded steel bars are embedded in the groove, a plurality of first structural steel bars are placed in the groove, and the top ends of the embedded steel bars and the first structural steel bars are mutually fixed; and finally, the groove provided with the first structural rib is subjected to filling treatment. When the reinforcing method of the concrete floor slab is used for reinforcing the concrete floor slab, after the structural ribs are additionally arranged in the reinforcing area, the tensile bearing capacity of the reinforced concrete beam to the concrete floor slab can be improved, and particularly, the tensile bearing capacity of the concrete floor slab can be improved on the basis that beam columns and concrete do not need to be additionally arranged; the risk that due to the fact that the construction quality is not tightly controlled and deviation exists in slab top steel bar construction, the tensile bearing capacity of a slab top is insufficient, and slab top concrete cracks is reduced, the construction process is simpler, and the construction difficulty is lower.

Description

Technical Field

[0001] The invention relates to the technical field of building maintenance, and in particular to a method for reinforcing a concrete floor slab. Background Art

[0002] Support steel bars and slab top steel bars are two very important parts of the building structure. Their quantity and quality directly affect the stability and safety of the building. In the design and construction process of the building, the setting and construction of support steel bars and slab top steel bars must be carried out in strict accordance with the specifications to ensure the stability and safety of the building. However, in actual projects, due to lax construction quality control, there are often deviations in the construction of the slab top steel bars of the concrete floor, resulting in insufficient tensile bearing capacity of the slab top and cracking of the slab top concrete.

[0003] At present, there are many commonly used floor crack reinforcement and treatment processes, including pasting carbon fiber cloth, thickening the floor, adding steel beams, etc. These methods have some defects in the construction process. For example, when using the method of pasting carbon fiber cloth to reinforce the concrete floor, when encountering a shear wall at the floor support, steel plates and anchor bolts are used to anchor the shear wall, and the protruding wall area is large, which will seriously affect the subsequent use function of the floor structure; when reinforcing the concrete floor by thickening the concrete floor, although the structural stiffness, floor bearing capacity, stiffness and overall stability can be improved, it also increases the deadweight of the floor and the load of the surrounding reinforced concrete beams, which may lead to new problems of beam structure overload, and the wet operation workload is large, which will have a greater impact on the environment.

[0004] For example, Chinese invention patent CN107327157B discloses a concrete floor reinforcement structure, with reinforced concrete beams arranged crosswise under the concrete floor, and the reinforced concrete beams extend into the side beams by 80 to 120 mm; the oblique beams are arranged at a distance of 0.1 to 0.11 of the original concrete floor span from the intersection; prestressed steel bars are arranged under the concrete floor, with a diameter of 12 to 14 mm, and a spacing of 250 to 300 mm between adjacent prestressed steel bars, and sprayed concrete is arranged on the surface of the prestressed steel bars. The structure of this floor first requires the addition of reinforcing beams, and secondly, concrete needs to be sprayed again on the original concrete floor, and the reinforcement is achieved by using the secondary solidified concrete and reinforcing beams. This is not only complex in process and difficult to construct, but also greatly increases the deadweight of the floor.

[0005] Therefore, when the existing technology is used to reinforce concrete floor slabs, there are problems such as complex process and great construction difficulty. Summary of the invention

[0006] The purpose of the present invention is to solve the problems of complex process and great construction difficulty in the prior art when reinforcing concrete floor slabs.

[0007] In order to solve the above technical problems, the embodiment of the present invention discloses a method for reinforcing a concrete floor slab, comprising the following steps:

[0008] A reinforcement area is selected on the top surface of the concrete floor slab, the reinforcement area is located above the reinforced concrete beam supporting the concrete floor slab, and the reinforcement area extends from both sides of the reinforced concrete beam along the width direction of the reinforced concrete beam when viewed in the vertical direction;

[0009] A groove is formed in the reinforcement area, and two ends of the groove extend out of two sides of the reinforced concrete beam respectively;

[0010] Pre-embedded rebars, embedding multiple rebars in the groove, the multiple rebars are arranged in sequence along the groove, and the bottom end of each rebar is extended and fixed in the concrete floor slab;

[0011] Placing the first structural reinforcement, placing a plurality of first structural reinforcements extending in the width direction of the reinforced concrete beam in the groove, with both ends of the plurality of first structural reinforcements extending out of both sides of the reinforced concrete beam, each implanted reinforcement being connected to one of the plurality of first structural reinforcements, and fixing the top end of the implanted reinforcement to the connected first structural reinforcement;

[0012] Filling: Fill the grooves where the structural reinforcement is provided so that the surface of the reinforced area after filling is not lower than the surface of the concrete floor slab.

[0013] By adopting the above technical solution, the reinforcement area is selected to be located above the reinforced concrete beam supporting the concrete floor slab, and the reinforcement area also extends to both sides of the width direction of the reinforced concrete beam; after the first structural reinforcement is added in the reinforcement area, the tensile bearing capacity of the reinforced concrete beam on the concrete floor slab can be increased. At the same time, by adding the first structural reinforcement, the number of structural reinforcements of the concrete floor slab and the reinforced concrete beam is increased, thereby increasing the effective section coefficient of the concrete floor slab, thereby increasing the effective calculated section of the concrete floor slab, and improving the tensile bearing capacity of the concrete floor slab.

[0014] Furthermore, when using this method to reinforce concrete slabs, only grooves are made on the concrete slabs during reinforcement, and then the first structural reinforcement is buried. The construction difficulty is low during the construction process, and no other structures need to be added to the concrete slabs. The self-load of the concrete slabs is less affected, and the main structure of the slabs will not be greatly affected. In addition, when using this method, no large machinery is needed during the construction process, the process is simple, the construction difficulty is low, and it is conducive to improving construction efficiency.

[0015] In summary, the reinforcement method of the concrete floor provided by the present invention can improve the tensile bearing capacity of the concrete floor without adding additional beams, columns and concrete, and reduce the risk of insufficient tensile bearing capacity of the top of the slab and cracking of the top of the slab due to lax construction quality control and deviations in the construction of the top slab steel bars. In addition, the construction process is simpler and the construction difficulty is lower.

[0016] In addition, embedded reinforcement is pre-buried in the groove, and the embedded reinforcement and the first structural reinforcement are fixed to each other. On the one hand, the embedded reinforcement can fix the first structural reinforcement; on the other hand, the embedded reinforcement can make the connection strength between the first structural reinforcement and the concrete floor slab higher.

[0017] According to the reinforcement method of the concrete floor provided by the embodiment of the present invention, when the grooves are opened: a plurality of grooves are provided, the plurality of grooves are spaced apart along the length direction of the reinforced concrete beam, and a first structural reinforcement adapted thereto is placed in each groove.

[0018] By adopting the above technical solution, a plurality of grooves are spaced apart along the length direction of the reinforced concrete beam, so that the structural reinforcement is spaced apart, the bearing capacity and earthquake resistance of the concrete floor are enhanced, and the concrete floor is made more firm and stable.

[0019] According to the reinforcement method of the concrete floor provided by the embodiment of the present invention, when the groove is opened: the groove covers the reinforcement area, and a plurality of second structural ribs are placed in the groove, and a plurality of first structural ribs and a plurality of second structural ribs are placed in the groove; wherein the plurality of first structural ribs are spaced apart along the length direction of the reinforced concrete beam, and the plurality of second structural ribs extend along the length direction of the reinforced concrete beam and are spaced apart along the width direction of the reinforced concrete beam.

[0020] By adopting the above technical solution, the first structural reinforcement and the second structural reinforcement form a grid structure in the groove. After the groove is filled, the structural reinforcement of the grid structure has good bonding and anchoring properties with the concrete, and the load borne is evenly diffused and distributed, which significantly improves the seismic and crack resistance of the concrete floor and reinforced concrete beam.

[0021] According to the reinforcement method of the concrete floor provided by the embodiment of the present invention, the second structural rib is located below the first structural rib, and the first structural rib and the second structural rib abut against and fix to each other; wherein the depth of the groove is greater than the sum of the diameter of the first structural rib and the diameter of the second structural rib, and is less than one third of the thickness of the reinforced concrete beam.

[0022] By adopting the above technical solution, the second structural reinforcement is located below the first structural reinforcement, and the first structural reinforcement is fixed to the embedded reinforcement, so the embedded reinforcement can also fix the second structural reinforcement, while also improving the connection strength between the second structural reinforcement and the concrete floor slab.

[0023] According to the reinforcement method of a concrete floor provided by an embodiment of the present invention, the spacing distance between two adjacent first structural bars among the plurality of first structural bars is equal, and the spacing distance between two adjacent second structural bars among the plurality of second structural bars is equal.

[0024] By adopting the above technical solution, the plurality of first structural bars and the plurality of second structural bars form a uniform grid structure, so that the load borne by the structural bars is more uniform, further improving the structural strength of the concrete floor slab.

[0025] According to the reinforcement method of the concrete floor provided by the embodiment of the present invention, when pre-embedding the rebars: a plurality of rebar holes are opened in the groove toward the concrete floor, a plurality of rebars are inserted into the rebar holes, and fixed with mortar.

[0026] By adopting the above technical solution, by opening anchor holes and inserting anchor bars into the anchor holes, and then fixing the anchor bars with mortar, the anchor bars and the concrete floor slab can be fixedly connected, thereby improving the connection strength between the anchor bars and the concrete floor slab.

[0027] According to the reinforcement method of the concrete floor provided by the embodiment of the present invention, a hook portion adapted to the first structural reinforcement is formed at the top end of each embedded reinforcement, and the first structural reinforcement passes through the hook portion of the embedded reinforcement connected thereto in sequence.

[0028] By adopting the above technical solution, the anchor bar is fixedly connected to the structural bar through its hook, so that the connection strength between the structural bar and the concrete floor is higher. In addition, during the construction process, after the anchor bar is inserted into the anchor bar hole, since the top of the anchor bar is formed with a hook that matches the structural bar, the structural bar can be passed through the hook to achieve a fixed connection between the anchor bar and the structural bar. During the construction process, the process is simple and it is convenient to achieve the connection between the anchor bar and the structural bar.

[0029] According to the reinforcement method of the concrete floor provided by the embodiment of the present invention, when selecting the reinforcement area: the selected reinforcement area extends an equal distance from both sides of the reinforced concrete beam along the width direction of the reinforced concrete beam, and extends in the width direction of the reinforced concrete beam to cover one third to two thirds of the overall width dimension of the concrete floor.

[0030] By adopting the above technical scheme, the selected reinforcement area extends at an equal distance from both sides of the reinforced concrete beam along the width direction of the reinforced concrete beam, so that when structural reinforcement is added in the reinforcement area, the tensile bearing capacity of the structural reinforcement for the concrete floor slabs on both sides of the reinforced concrete beam is the same; at the same time, the force on the reinforced concrete beam is uniform, avoiding the problem of destroying the internal structure of the reinforced concrete beam due to uneven force on the reinforced concrete beam.

[0031] The method for reinforcing a concrete floor slab according to an embodiment of the present invention comprises the following steps when a groove is formed:

[0032] Determine, detect the original steel bars in the concrete floor, determine the position of the original steel bars in the concrete floor, and the distance between the original steel bars and the top surface of the reinforced concrete floor, and determine the depth of the groove according to the measured distance, the depth of the groove is less than the measured distance;

[0033] Selecting a slotted area and drilling holes, selecting at least one slotted area in the reinforcement area, and drilling a plurality of holes in the at least one slotted area by a drilling tool, wherein the opening positions of the plurality of holes avoid the positions of the original steel bars in the reinforced concrete floor slab;

[0034] A chiseling area is opened, and concrete around the plurality of holes is chiseled out to form a plurality of chiseling areas in the grooved area;

[0035] Groove formation, extending the chiseling from the chiseling area to the grooved area, until the groove is completely formed in the grooved area;

[0036] The inner wall of each groove is roughened and cleaned before applying structural interface glue.

[0037] By adopting the above technical solution, the position of the original steel bars in the concrete slab and the distance between the original steel bars and the top surface of the reinforced concrete slab are measured, thereby avoiding the problem of damaging the original steel bars during the grooving. By drilling holes and using the drilled holes as a reference to expand and remove the concrete around the holes, the risk of damaging the original steel bars in the concrete slab due to construction errors by operators during the process of removing concrete is reduced.

[0038] Furthermore, the inner wall surface of the groove is roughened and coated with structural interface glue, so that after the groove is filled, the connection strength between the filler and the inner wall surface of the groove is higher.

[0039] According to the reinforcement method of the concrete floor provided by the embodiment of the present invention, when filling: polymer modified cement mortar is used for filling, and the filling area is polished after the filling is completed.

[0040] By adopting the above technical solution, the filler area is polished so that the upper wall surface of the reinforced floor slab is flat and smooth, with a good appearance, which is convenient for subsequent construction.

[0041] The beneficial effects of the present invention are:

[0042] The utility model discloses a method for reinforcing a concrete floor slab, comprising the following steps: selecting a reinforcement area on the top surface of the concrete floor slab, and opening a groove in the reinforcement area, and then burying a plurality of embedded bars in the groove, and placing a plurality of first structural bars in the groove, and the top of the embedded bars and the first structural bars are fixed to each other; finally, the groove provided with the structural bars is filled. When the concrete floor slab is reinforced by this method for reinforcing a concrete floor slab, after adding structural bars in the reinforcement area, the tensile bearing capacity of the reinforced concrete beam on the concrete floor slab can be increased. In particular, without the need to add additional beams, columns, and concrete, the tensile bearing capacity of the concrete floor slab can be improved, and the risk of insufficient tensile bearing capacity of the top slab and cracking of the top slab concrete due to lax construction quality control and deviations in the construction of the top slab steel bars is reduced. The construction process is simpler and the construction difficulty is lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 A flow chart of a method for reinforcing a concrete floor slab provided by an embodiment of the present invention;

[0044] Figure 2 A schematic diagram of the overall structure of a concrete floor slab in an implementation manner provided in an embodiment of the present invention;

[0045] Figure 3 A schematic diagram of a connection structure between a concrete floor slab and a reinforced concrete beam in an implementation manner provided in an embodiment of the present invention;

[0046] Figure 4 A schematic diagram of a connection structure between a concrete floor slab and a reinforced concrete beam in another implementation manner provided in an embodiment of the present invention;

[0047] Figure 5 A schematic diagram of a concrete floor slab groove structure provided by an embodiment of the present invention;

[0048] Figure 6 A schematic diagram of a partial cross-sectional structure of a concrete floor slab in an implementation manner provided in an embodiment of the present invention;

[0049] Figure 7 A schematic diagram of the overall structure of a concrete floor slab in another implementation manner is provided for an embodiment of the present invention;

[0050] Figure 8 A schematic diagram of a partial cross-sectional structure of a concrete floor slab in another implementation manner provided in an embodiment of the present invention;

[0051] Fig. 9 A schematic structural diagram of a selected grooved area in a concrete floor slab provided in an embodiment of the present invention.

[0052] Description of reference numerals:

[0053] 10. Concrete floor; L, length direction; W, width direction;

[0054] 100. Reinforced areas;

[0055] 110. Groove;

[0056] 120. Planting tendons; 1201. Hook;

[0057] 130. first structural rib; 131. second structural rib;

[0058] 140, slotting area;

[0059] 1401, hole; 1402, chiseled area;

[0060] 150. Polymer modified cement mortar;

[0061] 20. Reinforced concrete beams;

[0062] 210. stirrups;

[0063] 220. Longitudinal reinforcement. DETAILED DESCRIPTION

[0064] Support steel bars and slab top steel bars are two very important parts of the building structure. Their quantity and quality directly affect the stability and safety of the building. During the design and construction of the building, the setting and construction of support steel bars and slab top steel bars must be carried out in strict accordance with the specifications to ensure the stability and safety of the building. However, in actual projects, in some cases, the top concrete of the concrete floor slab will crack, posing a safety hazard. For example, in actual construction, due to lax construction quality control or construction errors, there is a problem of insufficient tensile bearing capacity of the top of the concrete floor slab, resulting in cracks in the top concrete slab.

[0065] In some schemes, although the reinforcement of the concrete floor slab is achieved, it is necessary to use secondary solidified concrete and reinforced beams for reinforcement. This is not only complicated in process and difficult in construction, but also greatly increases the deadweight of the floor slab.

[0066] In order to solve the above problems, the present invention provides a method for reinforcing a concrete floor slab, wherein a reinforcement area is selected on the top surface of the concrete floor slab, and a groove is opened in the reinforcement area. Next, a plurality of embedded bars are embedded in the groove, and a plurality of first structural bars are placed in the groove, and the top of the embedded bars is fixed to the first structural bars; finally, the groove with the structural bars is filled. This method for reinforcing a concrete floor slab can improve the tensile bearing capacity of the concrete floor slab without adding additional beams, columns, and concrete, and reduce the risk of insufficient tensile bearing capacity of the top slab and cracking of the top slab concrete due to lax construction quality control and deviations in the construction of the top slab steel bars. In addition, the construction process is simpler and the construction difficulty is lower.

[0067] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0068] like Figures 1 to 4 As shown, the present invention provides a method for reinforcing a concrete floor slab, comprising the following steps:

[0069] S1. A reinforcement area 100 is selected on the top surface of the concrete floor 10. The reinforcement area 100 is located above the reinforced concrete beam 20 supporting the concrete floor 10. When viewed in the vertical direction, the reinforcement area 100 extends from both sides of the reinforced concrete beam 20 along the width direction W of the reinforced concrete beam 20.

[0070] S2, opening a groove 110. Opening a groove 110 in the reinforcement area 100, with both ends of the groove 110 extending out of two sides of the reinforced concrete beam 20 respectively.

[0071] S3, pre-embed the anchor bars 120, embed a plurality of anchor bars 120 in the groove 110, the plurality of anchor bars 120 are arranged in sequence along the groove 110, and the bottom end of each anchor bar 120 extends and is fixed in the concrete floor 10.

[0072] S4. Place the first structural reinforcement 130. Place multiple first structural reinforcements 130 extending along the width direction W of the reinforced concrete beam 20 in the groove 110, and both ends of the multiple first structural reinforcements 130 extend out of both sides of the reinforced concrete beam 20. Each embedded reinforcement 120 is connected to one of the multiple first structural reinforcements 130, and the top end of the embedded reinforcement 120 is fixed to the first structural reinforcement 130 (referring to the first structural reinforcement 130 connected to the embedded reinforcement 120).

[0073] S5 . Filling: Filling the groove 110 provided with the first structural rib 130 , so that the surface of the reinforced area 100 after filling is not lower than the surface of the concrete floor 10 .

[0074] It should be noted that, in the vertical direction, the depth of the groove 110 should be smaller than the distance between the upper wall surface of the concrete floor 10 and the original steel bars in the concrete floor 10 .

[0075] In one embodiment, Figure 3 As shown, the reinforced concrete beam 20 is located between two adjacent concrete slabs 10, and is used to connect and support the two adjacent concrete slabs 10. Since longitudinal bars 220 and stirrups 210 are provided in the reinforced concrete beam 20, after the groove 110 is formed, the embedded bars 120 should be implanted at the position where the groove 110 is located on the concrete slab 10, so as to avoid damaging the stirrups 210 and longitudinal bars 220 in the reinforced concrete beam 20 when the groove is formed.

[0076] In another embodiment, if Figure 4 As shown, the reinforced concrete beam 20 is located below an integral concrete floor 10 to support the concrete floor 10. After the groove 110 is formed, the embedded steel bar 120 can be implanted at any position of the groove 110. Those skilled in the art can design it according to actual conditions and specific needs, and this embodiment does not make specific limitations on this.

[0077] Specifically, since the selected reinforcement area 100 is located above the reinforced concrete beam 20 supporting the concrete floor 10, and the reinforcement area 100 also extends to both sides of the reinforced concrete beam 20 in the width direction W; after adding the first structural reinforcement 130 in the reinforcement area 100, the tensile bearing capacity of the reinforced concrete beam 20 on the concrete floor 10 can be increased.

[0078] More specifically, the calculation formula of the effective calculated section (tensile bearing capacity) of the concrete floor 10 is: effective cross-sectional area A = cross-sectional area S × effective cross-sectional coefficient K. Among them, the effective cross-sectional coefficient K depends on the material, structural form and load type of the structure. By adding the first structural reinforcement 130, on the one hand, the load that the concrete floor 10 and the reinforced concrete beam 20 can bear is increased; on the other hand, the number of structural reinforcements in the concrete floor 10 and the reinforced concrete beam 20 is increased, making the structure of the concrete floor 10 and the reinforced concrete beam 20 more stable, and the steel material in the concrete floor 10 and the reinforced concrete beam 20 is increased, so that the effective cross-sectional coefficient K is increased, and then the effective calculated cross-sectional area A of the concrete floor 10 and the reinforced concrete beam 20 is increased, and the tensile bearing capacity of the concrete floor 10 and the reinforced concrete beam 20 is improved.

[0079] Furthermore, since only grooves are made on the concrete floor 10 and then the first structural ribs 130 are buried when reinforcing the concrete floor 10, the construction difficulty is relatively low during the construction process, and no other structures need to be added to the concrete floor 10, and the impact on the self-load of the concrete floor 10 is relatively small (since the grooves 110 are filled after the grooves are made, the self-weight of the concrete floor 10 changes slightly), and no significant impact is caused on the main structure of the concrete floor 10. In addition, this method does not require the use of large machinery during the construction process, the process is simple, and the construction efficiency is relatively high.

[0080] In summary, the effect of the reinforcement method of the concrete floor provided by the present invention is: it can improve the tensile bearing capacity of the concrete floor 10, reduce the construction difficulty, and improve the construction efficiency without causing a significant impact on the structure of the concrete floor 10. It solves the problem that due to lax construction quality control, there is a deviation in the construction of the top steel bars of the concrete floor 10, resulting in insufficient tensile bearing capacity of the top of the slab and cracking of the top concrete.

[0081] More specifically, embedded rebars 120 are pre-buried in the groove 110 and fixed to the first structural rebars 130. On the one hand, the embedded rebars 120 can fix the first structural rebars 130; on the other hand, the embedded rebars 120 can make the connection strength between the first structural rebars 130 and the concrete floor 10 higher.

[0082] In one embodiment, in the vertical direction, the embedded reinforcement 120 is embedded in the bottom wall surface of the groove 110 , wherein the existing reinforcement in the concrete floor 10 should be avoided when embedding the embedded reinforcement 120 .

[0083] In another embodiment, when the first structural rib 130 is placed in the groove 110 and close to the opposite side wall surface of the groove 110 , the implanted bar 120 may be embedded in the opposite side wall surface of the groove 110 .

[0084] More specifically, the anchor bar 120 can be set as a short steel bar, an expansion bolt with a hook at the end, etc. For example, when the anchor bar 120 is set as a short steel bar, the end of the short steel bar can be welded or bonded to the first structural bar 130, or the end of the short steel bar can be bent so that it hooks the first structural bar 130, and then tied with a wire or a rolled strip; when the anchor bar 120 is set as an expansion bolt with a hook at the end, when the first structural bar 130 is placed in the groove 110, the first structural bar 130 passes through the hook at the end of the expansion bolt, thereby fixing the first structural bar 130.

[0085] More specifically, the number of the plurality of first structural ribs 130 may be set to 3, 6, 8, etc. Those skilled in the art may design it according to actual conditions and specific requirements, and this embodiment does not make any specific limitation to this.

[0086] More specifically, the number of the plurality of embedded rebars 120 may be set to 2, 5, 7, etc. Those skilled in the art may design it according to actual conditions and specific requirements, and this embodiment does not make any specific limitation to this.

[0087] More specifically, in one embodiment, when the groove 110 is opened in the reinforcement area 100, the groove 110 extends to the edge of the area on both sides of the reinforced concrete beam 20 in the reinforcement area 100, and the two ends of the first structural reinforcement 130 extend to the opposite side walls of the groove 110 on the reinforced concrete beam 20, respectively, to ensure that after the first structural reinforcement 130 is added to the groove 110, the tensile bearing capacity of the concrete floor 10 and the reinforced concrete beam 20 is improved.

[0088] More specifically, in one embodiment, when the groove 110 is opened in the reinforcement area 100 , the groove 110 does not extend to the edges of the area on both sides of the reinforced concrete beam 20 in the reinforcement area 100 .

[0089] Furthermore, if Figures 2 to 6 As shown, in the implementation method disclosed in this embodiment, when the groove 110 is opened: a plurality of grooves 110 are provided, and the plurality of grooves 110 are spaced apart along the length direction L of the reinforced concrete beam 20, and a first structural rib 130 adapted thereto is placed in each groove 110, so that the first structural ribs 130 are spaced apart, thereby enhancing the bearing capacity and seismic resistance of the concrete floor 10, and thereby making the concrete floor 10 more firm and stable.

[0090] Specifically, in one embodiment, according to actual engineering conditions, when the original steel bars in the concrete floor 10 area and the reinforced concrete beam 20 area in the selected reinforcement area 100 are relatively small, the spacing distance between each of the multiple grooves 110 can be set to be the same.

[0091] In another embodiment, when only some areas of the concrete floor 10 area and the reinforced concrete beam 20 area within the selected reinforcement area 100 have fewer original steel bars, the spacing distances between each of the multiple grooves 110 can be set to be different, and only some areas are reinforced, where the some areas can be 1 / 3, 1 / 2, etc. of the reinforcement area 100.

[0092] It should be understood that the arrangement of the groove 110 is not limited. It can be a strip groove corresponding to the number of the first structural ribs 130 and the second structural ribs 131, or the groove 110 can be arranged as an integral type.

[0093] In one embodiment, a plurality of grooves 110 are provided, and the number thereof corresponds to the first structural ribs 130 and the second structural ribs 131. The grooves 110 for placing the first structural ribs 130 extend along the width direction W of the reinforced concrete beam 20, and both ends thereof extend from the reinforced concrete beam 20 to the concrete floor 10, and the distances at both ends of the grooves 110 for placing the first structural ribs 130 extending from the reinforced concrete beam 20 are equal.

[0094] The number of the second structural ribs 131 is not limited, and can be set to 2, 3, etc. When the second structural ribs 131 are set to 2, there are also 2 grooves 110 for placing the second structural ribs 131, both extending along the length direction L of the reinforced concrete beam 20, and located at both ends of the groove 110 for placing the first structural ribs 130, and the two grooves 110 are connected to each other. After the first structural ribs 130 and the second structural ribs 131 are placed in the two grooves 110, the first structural ribs 130 and the second structural ribs 131 are fixed to each other.

[0095] When the number of the second structural ribs 131 is three, three grooves 110 for placing the second structural ribs 131 are also provided, all extending along the length direction L of the reinforced concrete beam 20 and located at both ends and the middle of the groove 110 for placing the first structural ribs 130, and the two grooves 110 are connected to each other. After the first structural ribs 130 and the second structural ribs 131 are placed in the two grooves 110, the first structural ribs 130 and the second structural ribs 131 are fixed to each other.

[0096] It should be noted that the structural ribs may be provided by only providing the first structural rib 130 or by providing both the first structural rib 130 and the second structural rib 131. Those skilled in the art may design according to actual conditions and specific requirements, and this embodiment does not make any specific limitation on this.

[0097] In another embodiment, firstly, a plurality of transverse grooves (not shown in the figure) extending along the width direction W of the reinforced concrete beam 20 are opened in the reinforcement area 100, and secondly, a plurality of longitudinal grooves (not shown in the figure) extending along the length direction L of the reinforced concrete beam 20 are opened in the reinforcement area 100, and each longitudinal groove passes through a plurality of transverse grooves; wherein, the depth of the transverse groove is less than the depth of the longitudinal groove. Moreover, a rebar 120 is also embedded at the intersection of the transverse groove and the longitudinal groove, wherein, in the vertical direction, the bottom end of the rebar 120 extends and is fixed in the bottom wall surface of the longitudinal groove, and the top end extends into the transverse groove along the vertical direction. Then, the second structural rib 131 is placed in the longitudinal groove, and the first structural rib 130 is placed in the transverse groove, wherein, at the intersection of the transverse groove and the longitudinal groove, the first structural rib 130 and the second structural rib 131 are abutted and fixed to each other; and the top end of the rebar 120 is fixed to the first structural rib 130. By this arrangement, the damage to the original structure of the concrete floor slab 10 can be reduced.

[0098] It should be understood that when the groove 110 extends obliquely or parallel to the width direction W of the reinforced concrete beam 20, the first structural reinforcement 130 in the groove 110 is also arranged in the same direction as the groove 110 (that is, the first structural reinforcement 130 in the groove 110 also extends obliquely or parallel to the width direction W of the reinforced concrete beam 20).

[0099] More specifically, the number of the plurality of grooves 110 may be set to 2, 4, 8, etc. Those skilled in the art may design it according to actual conditions and specific requirements, and this embodiment does not make any specific limitation to this.

[0100] In another implementation of this embodiment, the groove 110 is configured as an integral structure, such as Figure 7 and Figure 8As shown, the groove 110 covers the reinforcement area 100, and a plurality of first structural ribs 130 and a plurality of second structural ribs 131 are placed in the groove 110; wherein the plurality of first structural ribs 130 are spaced apart along the length direction L of the reinforced concrete beam 20, and the spacing distance between two adjacent first structural ribs 130 among the plurality of first structural ribs 130 is equal. The plurality of second structural ribs 131 extend along the length direction L of the reinforced concrete beam 20, and are spaced apart along the width direction W of the reinforced concrete beam 20, wherein the spacing distance between two adjacent second structural ribs 131 among the plurality of second structural ribs 131 is equal. Thus, the first structural ribs 130 and the second structural ribs 131 form a uniform grid structure in the groove 110. After the groove 110 is filled, the structural ribs of the grid structure have good bonding and anchoring properties with the concrete, and the load borne is evenly diffused and distributed, which significantly improves the earthquake resistance and crack resistance of the concrete floor 10 and the reinforced concrete beam 20.

[0101] Specifically, the first structural rib 130 and the second structural rib 131 may be fixed by tying the first structural rib 130 and the second structural rib 131 with wire or rolled strip, or by welding them together. Those skilled in the art may design according to actual conditions and specific requirements, and this embodiment does not specifically limit this.

[0102] It should be noted that the first structural ribs 130 and the second structural ribs 131 are commonly used steel bars in construction. Regarding the specific specifications and models of the steel bars, those skilled in the art can design them according to actual conditions and specific needs, and this embodiment does not make any specific limitations.

[0103] Furthermore, if Figure 8 As shown, in the embodiment disclosed in this embodiment, the second structural rib 131 is located below the first structural rib 130, and the first structural rib 130 and the second structural rib 131 are mutually abutted and fixed. Because the first structural rib 130 is also fixed to the embedded bar 120, the embedded bar 120 can also fix the second structural rib 131, and at the same time, the connection strength between the second structural rib 131 and the concrete floor 10 is also improved. Among them, the depth of the groove 110 is greater than the sum of the diameter of the first structural rib 130 and the diameter of the second structural rib 131.

[0104] Furthermore, if Figure 3 and Figure 4 As shown, in the implementation method disclosed in this embodiment, when pre-embedded rebar 120: a plurality of rebar holes (not shown in the figure) are opened in the groove 110 toward the concrete floor slab 10 to facilitate the insertion of the rebar 120 into the rebar holes; a plurality of rebars 120 are inserted into the rebar holes and fixed with mortar, so that the rebar 120 is fixedly connected to the concrete floor slab 10, thereby improving the connection strength between the rebar 120 and the concrete floor slab 10.

[0105] It should be noted that the holes for anchoring the reinforcement need to be roughened after cleaning, and after roughening, structural interface glue needs to be applied on the inner wall surface of the holes for anchoring the reinforcement to enhance the connection strength between the mortar and the concrete floor slab 10.

[0106] Specifically, in one embodiment, if there is no original steel bar in the concrete floor 10 below the bottom wall of the groove 110 in the vertical direction, the anchor holes can be opened at the bottom wall of the groove 110 at the same interval along the width direction W of the reinforced concrete beam 20. In addition, the plurality of anchor holes are located on the same straight line, so that after the first structural bar 130 is placed in the groove 110, the anchor 120 and the first structural bar 130 are fixed to each other.

[0107] Specifically, in another embodiment, if there are original steel bars in the concrete floor 10 below the bottom wall of the groove 110 in the vertical direction, it is necessary to detect the position without original steel bars in the concrete floor 10 on the bottom wall of the groove 110, and then determine the opening area, and then open the anchor holes in the opening area, and finally implant the anchor 120 in the anchor holes. In this embodiment, since there may be a situation where the anchor holes are not on the same straight line, taking the anchor 120 implanted in the anchor hole as a short steel bar as an example, after the short steel bar is placed in the anchor hole, the first structural bar 130 is placed, and finally the end of the short steel bar extending into the groove 110 is bent so that it hooks the first structural bar 130, and then fixed with wire or rolled strip.

[0108] Furthermore, if Figure 6 and Figure 8 As shown, in the implementation method disclosed in this embodiment, a hook portion 1201 adapted to the first structural rib 130 is formed at the top end of each embedded bar 120, and the first structural rib 130 passes through the hook portion 1201 of each embedded bar 120 connected thereto in turn, thereby fixing the embedded bar 120 and the first structural rib 130 to be connected via the hook portion 1201, thereby fixing the first structural rib 130 in the groove 110.

[0109] Specifically, since the anchor bar 120 goes deeper into the concrete floor 10 and is fixedly connected thereto, and the first structural bar 130 is fixedly connected to the anchor bar 120, the connection strength between the first structural bar 130 and the concrete floor 10 is improved. In addition, during the construction process, after the anchor bar 120 is inserted into the anchor bar hole, since the top of the anchor bar 120 is formed with a hook portion 1201 adapted to the first structural bar 130, the first structural bar 130 can be passed through the hook portion 1201 to achieve a fixed connection between the anchor bar 120 and the first structural bar 130, the construction process is simple, and the anchor bar 120 and the first structural bar 130 are conveniently connected.

[0110] Furthermore, if Figures 2 to 4As shown, in the implementation method disclosed in this embodiment, when the reinforcement area 100 is selected: the selected reinforcement area 100 extends the same distance from both sides of the reinforced concrete beam 20 along the width direction W of the reinforced concrete beam 20, and extends to cover one-third to two-thirds of the overall width of the concrete floor 10 in the width direction W of the reinforced concrete beam 20. Therefore, when the first structural reinforcement 130 is added to the reinforcement area 100, the first structural reinforcement 130 has the same tensile bearing capacity for the concrete floor 10 located on both sides of the reinforced concrete beam 20; at the same time, the stress on the reinforced concrete beam 20 is uniform, avoiding the problem of damaging its internal structure due to uneven stress on the reinforced concrete beam 20.

[0111] Specifically, the reinforced area 100 covers one third to two thirds of the overall width of the concrete floor slab 10 , while ensuring that the reinforced concrete beam 20 has sufficient tensile bearing capacity for the concrete floor slab 10 , and also minimizes damage to the concrete floor slab 10 .

[0112] More specifically, the reinforcement area 100 may cover 1 / 3, 1 / 2, 2 / 3, etc. of the overall width of the concrete floor 10. Those skilled in the art may design it according to actual conditions and specific needs, and this embodiment does not make any specific limitations on this.

[0113] More specifically, the reinforcement area 100 may cover all or part of the overall length of the concrete floor 10, such as 1 / 2, 3 / 4, etc. Those skilled in the art may design it according to actual conditions and specific needs, and this embodiment does not make any specific limitations on this.

[0114] Furthermore, if Figure 2 , Figure 6 and Figure 8 As shown, in the implementation method disclosed in this embodiment, when the groove 110 is opened, the following steps are included:

[0115] The original steel bars in the concrete slab 10 are measured and detected, the positions of the original steel bars in the concrete slab 10 and the distance between the original steel bars and the top surface of the reinforced concrete slab 10 are measured, and the depth of the groove 110 is determined according to the measured distance. The depth of the groove 110 is less than the measured distance, thereby avoiding the problem of damaging the original steel bars in the concrete slab 10 when grooving.

[0116] Select a slotted area 140 and drill holes. Select at least one slotted area 140 in the reinforcement area 100, and drill multiple holes 1401 in at least one slotted area 140 using a drilling tool, wherein the drilling positions of the multiple holes 1401 avoid the positions of the original steel bars in the reinforced concrete floor 10.

[0117] A chiseled area 1402 is opened, and concrete around the plurality of holes 1401 is chiseled away, so that a plurality of chiseled areas 1402 are formed in the grooved area 140 .

[0118] The groove 110 is formed by extending the chiseling area 1402 into the grooved area 140 until the groove 110 is completely formed in the grooved area 140 .

[0119] The wall surface of the groove 110 is treated by roughening the inner wall surface of each groove 110 , and the inner wall surface of each groove 110 is cleaned and then coated with structural interface glue, so that after the groove 110 is filled, the connection strength between the filler and the inner wall surface of the groove 110 is higher.

[0120] Specifically, the drilled hole 1401 is used as a reference to expand and chisel away the concrete around the hole 1401, and a chiseling area 1402 is formed, thereby reducing the risk of damaging the original steel bars in the concrete floor 10 due to construction errors by operators during the process of chiseling away the concrete. The drilling depth should be less than the distance between the original steel bars in the concrete floor 10 and the top surface of the reinforced concrete floor 10.

[0121] More specifically, the chiseling is extended into the groove area 140 through the chiseling area 1402. Since there are multiple chiseling areas 1402, multiple people can be involved in the chiseling process, thereby improving the construction efficiency.

[0122] More specifically, the number of the multiple holes 1401 and the multiple chiseled areas 1402 can be 2, 4, 5, etc. Those skilled in the art can design them according to the actual situation and specific needs, and this embodiment does not make any specific limitation on this.

[0123] More specifically, the at least one slotted area 140 may be provided with 1, 2, 4, etc., and those skilled in the art may design it according to the actual situation and specific requirements, and this embodiment does not make any specific limitation to this.

[0124] More specifically, the drilling tool may be an electric drill, an impact drill, a drilling machine, etc., wherein the drill bit should be selected such that the length of the drill bit is smaller than the distance between the original steel bars in the concrete floor 10 and the top surface of the reinforced concrete floor 10 .

[0125] More specifically, when detecting the original steel bars in the concrete floor 10, an ultrasonic detector, a metal detector, etc. can be used. Those skilled in the art can design them according to the actual situation and specific needs, and this embodiment does not make any specific limitations on this.

[0126] More specifically, the structural interface adhesive may be water-based epoxy adhesive, acrylic adhesive, polyurethane adhesive, etc. Those skilled in the art may design it according to actual conditions and specific needs, and this embodiment does not specifically limit this.

[0127] More specifically, the shape of the groove 110 may be a rectangle or other polygons, and those skilled in the art may design it according to actual conditions and specific requirements, which is not specifically limited in this embodiment.

[0128] For example, in one embodiment, the groove 110 is rectangular. After selecting a rectangular slotted area 140 in the reinforcement area 100, a slotted line is drawn on the edge of the rectangular slotted area 140. The slotted line is used as a reference when slotting, thereby avoiding the problem of exceeding the slotted area 140 when slotting.

[0129] In another embodiment, the groove 110 is polygonal. After a rectangular groove area 140 is selected in the reinforcement area 100, if there are areas around the groove area 140 that need to be reinforced, groove lines are drawn around these areas that need to be reinforced and the groove area 140, and then grooves are cut to form a polygonal groove 110.

[0130] In another embodiment, the groove 110 is rectangular. After selecting a rectangular groove area 140 in the reinforcement area 100, a groove line is drawn on the edge of the rectangular groove area 140, and a rectangular groove 110 is first opened according to the groove line. Then, in the length direction L of the reinforced concrete beam 20, a groove line parallel to the width direction W of the reinforced concrete beam 20 is drawn on the opposite side walls of the opened groove 110. The distance between the groove line and the bottom wall of the groove 110 is less than half of the distance from the bottom wall of the groove 110 to the top surface of the concrete floor 10. For example, the distance between the groove line and the bottom wall of the groove 110 is 1 / 3, 1 / 4, etc. of the distance from the bottom wall of the groove 110 to the top surface of the concrete floor 10. Then, within the range from the grooving line to the bottom wall of the groove 110, reinforcement grooves (not shown in the figure) are opened on the opposite side walls of the groove 110. This can increase the bonding area between the groove 110 and the reinforcement groove and the concrete floor slab 10 after being filled, thereby improving the connection strength between the first structural rib 130 and the concrete floor slab 10.

[0131] Furthermore, if Figure 2 , Figure 6 and Figure 7 As shown, in the implementation method disclosed in this embodiment, when filling: polymer modified cement mortar 150 is used for filling, and the multiple grooves 110 are filled with pressure and spread, and the filling area is polished after the filling is completed.

[0132] Specifically, in one embodiment, during the construction process, when the groove 110 is filled with the polymer-modified cement mortar 150, the groove 110 is filled with the polymer-modified cement mortar 150 in the vertical direction until the upper wall surface of the groove 110 is higher than the surface of the concrete floor 10, and then the polymer-modified cement mortar 150 shrinks after being cured for at least three days. After shrinkage, the upper wall surface of the groove 110 may be higher than the surface of the concrete floor 10 or flush with the surface of the concrete floor 10. When the upper wall surface of the groove 110 is higher than the surface of the concrete floor 10, the raised part can be chiseled off, and then the filler area is polished as a whole to make the reinforcement area 100 flat; when the upper wall surface of the groove 110 is flush with the surface of the concrete floor 10, the filler area is simply polished to make the reinforcement area 100 flat.

[0133] More specifically, in another embodiment, during the construction process, when the groove 110 is filled with the polymer-modified cement mortar 150, the groove 110 is filled with the polymer-modified cement mortar 150 in the vertical direction until the upper wall surface of the groove 110 is flush with the surface of the concrete floor 10, and then the polymer-modified cement mortar 150 shrinks after being cured for at least three days. After shrinkage, the upper wall surface of the groove 110 may be lower than the surface of the concrete floor 10 or flush with the surface of the concrete floor 10. When the upper wall surface of the groove 110 is lower than the surface of the concrete floor 10, the portion of the groove 110 below the surface of the concrete floor 10 is leveled to make the reinforcement area 100 flat; when the upper wall surface of the groove 110 is flush with the surface of the concrete floor 10, the filling area is simply polished to make the reinforcement area 100 flat.

[0134] In summary, the above two implementation methods can facilitate subsequent construction, for example, facilitate floor laying.

[0135] More specifically, the curing days of the polymer modified cement mortar 150 can be 3 days, 5 days, 6 days, etc. Those skilled in the art can design it according to the actual situation and specific needs, and this embodiment does not make any specific limitation on this.

[0136] More specifically, the polymer modified cement mortar 150 can be selected from polymer acrylic emulsion cement mortar, polymer emulsion modified cement mortar, polymer alkyd modified cement mortar, etc. Those skilled in the art can design it according to actual conditions and specific needs, and this embodiment does not make any specific limitations on this.

[0137] The above is an explanation of the implementation mode of the present invention by specific specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this invention are limited to this implementation mode. On the contrary, the purpose of introducing the invention in conjunction with the implementation mode is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide a deep understanding of the present invention, many specific details will be included in the above description. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the key points of the present invention, some specific details will be omitted in the description. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0138] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0139] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0140] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0141] In the description of this embodiment, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

Claims

1. A method for reinforcing a concrete floor, characterized in that: The following steps are involved: A reinforcement area is selected on the top surface of the concrete floor slab, the reinforcement area is located above the reinforced concrete beam supporting the concrete floor slab, and when viewed in the vertical direction, the reinforcement area extends out of both sides of the reinforced concrete beam along the width direction of the reinforced concrete beam; A groove is formed in the reinforcement area, and two ends of the groove extend out of two sides of the reinforced concrete beam respectively; Pre-embedded rebars, where a plurality of rebars are embedded in the groove, the plurality of rebars are arranged in sequence along the groove, and the bottom end of each rebar is extended and fixed in the concrete floor slab; Placing first structural bars, placing a plurality of the first structural bars extending along the width direction of the reinforced concrete beam in the groove, with both ends of the plurality of the first structural bars extending out of both sides of the reinforced concrete beam, each of the embedded bars being connected to one of the plurality of the first structural bars, and fixing the top end of the embedded bar to the connected first structural bar; Filling: Filling the groove provided with the structural reinforcement so that the surface of the reinforced area after filling is not lower than the surface of the concrete floor.

2. The method for reinforcing a concrete floor slab according to claim 1, characterized in that: When opening the groove: A plurality of the grooves are provided, and the plurality of the grooves are distributed at intervals along the length direction of the reinforced concrete beam, and the first structural reinforcement adapted thereto is placed in each of the grooves.

3. The method for reinforcing a concrete floor slab according to claim 1, characterized in that: When opening the groove: The groove covers the reinforcement area, and a plurality of second structural ribs are placed in the groove, and a plurality of the first structural ribs and a plurality of the second structural ribs are placed in the groove; wherein, A plurality of the first structural bars are spaced apart along the length direction of the reinforced concrete beam, and a plurality of the second structural bars extend along the length direction of the reinforced concrete beam and are spaced apart along the width direction of the reinforced concrete beam.

4. The method for reinforcing a concrete floor slab according to claim 3, characterized in that: The second structural rib is located below the first structural rib, and the first structural rib and the second structural rib abut against each other and are fixed to each other; wherein, The depth of the groove is greater than the sum of the diameter of the first structural reinforcement and the diameter of the second structural reinforcement, and is less than one third of the thickness of the reinforced concrete beam.

5. The method for reinforcing a concrete floor slab according to claim 4, characterized in that: The spacing distance between two adjacent first structural ribs among the plurality of first structural ribs is equal, and the spacing distance between two adjacent second structural ribs among the plurality of second structural ribs is equal.

6. The method for reinforcing a concrete floor slab according to any one of claims 1 to 4, characterized in that: When pre-embedded reinforcement: A plurality of anchor bolt holes are opened in the groove toward the concrete floor slab, the plurality of anchor bolts are inserted into the anchor bolt holes, and are fixed by using mortar.

7. The method for reinforcing a concrete floor slab according to claim 6, characterized in that: A hook portion adapted to the first structural bar is formed at the top end of each of the embedded bars, and the first structural bar passes through the hook portion of each of the embedded bars connected thereto in sequence.

8. The method for reinforcing a concrete floor slab according to any one of claims 1 to 4, characterized in that: When selecting the reinforcement area: The reinforcement area is selected to extend an equal distance from both sides of the reinforced concrete beam in the width direction of the reinforced concrete beam, and to extend in the width direction of the reinforced concrete beam to cover one third to two thirds of the overall width of the concrete floor slab.

9. The method for reinforcing a concrete floor slab according to any one of claims 1 to 4, characterized in that: When the groove is opened, the following steps are included: Determine, detect the original steel bars in the concrete slab, determine the position of the original steel bars in the concrete slab, and the distance between the original steel bars and the top surface of the reinforced concrete slab, and determine the depth of the groove according to the measured distance, the depth of the groove is less than the measured distance; Selecting slotted areas and drilling holes, selecting at least one slotted area in the reinforcement area, and drilling a plurality of holes in at least one slotted area by a drilling tool, wherein the opening positions of the plurality of holes avoid the positions of the original steel bars in the reinforced concrete floor slab; Opening a chiseling area, chiseling away concrete around the plurality of holes, and forming a plurality of the chiseling areas in the grooved area; The groove is formed by extending the chiseling area into the grooved area until the groove is completely opened in the grooved area; The inner wall surface of each groove is roughened, and the inner wall surface of each groove is cleaned and then coated with structural interface glue.

10. The method for reinforcing a concrete floor slab according to any one of claims 1 to 4, characterized in that: When filling: Polymer modified cement mortar is used for filling, and the filling area is polished after the filling is completed.

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