Updating and transforming method and structure based on masonry structure prefabricated floor slab

Abstract

The invention discloses a method and a structure for updating and transforming a prefabricated floor slab based on a masonry structure. The updating and transforming method comprises the steps that S1, an original prefabricated floor slab is cut off, and an original prefabricated floor slab residual part in a bearing wall (1) is reserved to serve as a node block (2); s2, reinforcing steel bars (3) used for newly building a floor slab (7) are arranged in the holes of the node blocks in a penetrating mode; s3, reinforcing steel bars are buried in the holes, and the holes of the joint blocks are filled with fine aggregate concrete; and S4, a newly-built floor slab is built based on the node blocks, and the reinforcing steel bars pre-buried in the holes of the node blocks serve as slab bottom stressed reinforcing steel bars (31) of the newly-built floor slab. At the floor slab connecting part of the bearing wall, the original prefabricated floor slab residual part is used as a node block, and the plate bottom load-bearing steel bars of the newly-built floor slabs on the two sides of the bearing wall are pre-buried in holes of the node block, so that the newly-built floor slabs which are newly poured and constructed can be firmly combined with the bearing wall through the node block.

Description

TECHNICAL FIELD

[0001] The present application relates to an old building reconstruction structure, in particular to a reconstruction method and structure based on a masonry structure prefabricated floor. BACKGROUND

[0002] At present, there are still a large number of old masonry buildings using prefabricated plates in China, and some buildings have been in use for more than 30 years, entering the structural performance degradation period. After long-term use, the concrete carbonization and chloride ion erosion cause the protective layer to peel off, the prestressed steel bar to rust, and the stiffness and bearing capacity of the plate body to decrease, and some floors begin to have cracks, leakage, plate end slip and other problems.

[0003] In view of the housing decoration and reconstruction, the change of use function or the increase of load, the prefabricated plate needs to be reinforced and reconstructed or replaced. The common reinforcement of the prestressed multi-hole floor of the masonry structure generally uses carbon fiber or steel plate to reinforce the bottom of the plate, and the disadvantages are:

[0004] (1) The concrete strength of the prestressed multi-hole floor is low and carbonization is serious, and even cracks, leakage, plate end slip and other problems occur, and the carbon fiber or steel plate pasted on the bottom of the plate cannot solve the above problems;

[0005] (2) The original steel bar of the prestressed multi-hole floor is unknown, and the existing prestress is unknown, and after the use function is changed or the use load is increased, it cannot be reinforced and recalculated;

[0006] (3) The durability of the reinforced prestressed multi-hole floor cannot meet the use requirements.

[0007] In summary, the current problem is that:

[0008] At present, the existing old masonry structure floor reconstruction technology method has many defects, and the effect is limited for improving the bearing capacity of the reconstructed masonry structure floor. SUMMARY

[0009] The purpose of the present application is to provide a reconstruction method and structure based on a masonry structure prefabricated floor, which can effectively improve the bearing capacity of the reconstructed masonry structure floor.

[0010] In order to achieve the above technical purpose, the present application adopts the following technical scheme:

[0011] The application discloses a reconstruction method based on a prefabricated floor of a masonry structure, and the reconstruction method comprises the following steps: S1, cutting off an original prefabricated floor, and leaving a residual part of the original prefabricated floor in a bearing wall as a node block; S2, arranging reinforcing steel bars for a newly-built floor in a hole of the node block; S3, embedding plate bottom stress reinforcing steel bars in the hole, and filling the hole of the node block with fine stone concrete; and S4, constructing the newly-built floor based on the node block, and taking the plate bottom stress reinforcing steel bars embedded in the hole of the node block as plate bottom stress reinforcing steel bars of the newly-built floor.

[0012] Further, the bearing wall is an interior wall, and floors are constructed on both sides of the bearing wall; the plate bottom stress reinforcing steel bars of the newly-built floors on both sides of the bearing wall are connected together through the hole of the node block.

[0013] Further, the bearing wall is an exterior wall.

[0014] The application discloses a reconstruction structure based on a prefabricated floor of a masonry structure, comprising a bearing wall; the reconstruction structure further comprises a node block, which is a residual part of an original prefabricated floor left in the bearing wall after the original prefabricated floor is cut off, and the node block has a hole; the reconstruction structure further comprises a newly-built floor constructed based on the node block, and plate bottom stress reinforcing steel bars of the newly-built floor are embedded in the hole of the node block.

[0015] Further, the bearing wall is an interior wall, and floors are constructed on both sides of the bearing wall; the plate bottom stress reinforcing steel bars of the newly-built floors on both sides of the bearing wall are connected together through the hole of the node block.

[0016] Further, the bearing wall is an exterior wall.

[0017] Further, the plate bottom stress reinforcing steel bars of the newly-built floor are embedded in the hole of the node block, specifically, the plate bottom stress reinforcing steel bars are embedded in the hole, and the hole is filled with fine stone concrete.

[0018] The reconstruction method and structure based on the prefabricated floor of the masonry structure of the application have the following main beneficial effects compared with the prior art:

[0019] At a floor connecting position of the bearing wall, the residual part of the original prefabricated floor is used as the node block, and the plate bottom stress reinforcing steel bars of the newly-built floors on both sides of the bearing wall are embedded in the hole of the node block, so that the newly-poured newly-built floor can be firmly combined with the bearing wall through the node block, the strength and stability of the connection between the newly-built floor and the bearing wall are enhanced, the newly-poured structure floor is reconstructed, and the bearing capacity of the reconstructed masonry structure floor is improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a view facing the wall surface of the bearing wall.

[0021] Figure 2 Figure 2 is a view of a wall section of a load-bearing wall for a second embodiment of a masonry wall floor structure;

[0022] Figure 3 Figure 3 is a view of a wall section of a load-bearing wall for a third embodiment of a masonry wall floor structure. DETAILED DESCRIPTION

[0023] The specific embodiments of the present application are described further below:

[0024] Embodiment 1

[0025] Referring to Figure 1 and Figure 2 , the present embodiment provides a retrofitting method based on a prefabricated floor of a masonry structure. The main innovation of the retrofitting method is that the newly poured new floor 7 has the plate bottom load-bearing steel bars 31 pre-buried in the holes of the node block 2, which can be firmly combined with the load-bearing wall 1 through the node block 2.

[0026] It should be noted that the load-bearing wall 1 mentioned in the present embodiment 1 is a masonry structure load-bearing wall. The load-bearing wall 1 is an interior wall of a building, and a floor is constructed on both sides of the load-bearing wall 1.

[0027] Specifically,

[0028] First, the masonry wall floor structure before the retrofitting: before the retrofitting, the masonry wall floor structure adopts a prefabricated floor. Those skilled in the art can understand that this prefabricated floor is usually a prestressed concrete perforated slab. This prefabricated floor reduces the self-weight and saves materials while ensuring the structural strength by setting holes (cavities) inside the slab.

[0029] The retrofitting method of the present embodiment 1 specifically includes the following steps:

[0030] S1, cutting off the original prefabricated floor along the floor joint of the load-bearing wall 1, leaving a small section of the original prefabricated floor remaining part in the load-bearing wall 1 as a node block 2.

[0031] S2, threading a plurality of steel bars 3 (as plate bottom load-bearing steel bars 31 of the new floor 7) for the new floor 7 in the holes of each node block 2, so that the new floor 7 on both sides of the load-bearing wall 1 is connected together through the steel bars 3.

[0032] S3, for the holes of each node block 2 with the plate bottom load-bearing steel bars 31, filling the holes with fine stone concrete, so as to pre-bury the plate bottom load-bearing steel bars 31 in the holes (as indicated by arrow A in Figure 1 ).

[0033] S4, after the concrete strength grade of the node block 2 hole reaches the design requirement, the new floor 7 is built on both sides of the load-bearing wall 1 based on the node block 2. That is, the new floor 7 on both sides of the load-bearing wall 1, the plate bottom stress reinforcement 31 of both are connected through the hole of the node block 2.

[0034] Those skilled in the art can understand that the reinforcement 3 inside the new floor 7 is composed of the plate bottom stress reinforcement 31, the plate surface stress reinforcement 32 and the plate distribution reinforcement 33.

[0035] Those skilled in the art can understand that when the new floor 7 is built, the new cast-in-place floor formwork is built, the plate surface stress reinforcement 32 is bent at the node block 2, the plate distribution reinforcement 33 is evenly distributed perpendicular to the stress reinforcement, the new floor 7 concrete is poured, and the new load-bearing wall surface layer is built.

[0036] The main advantages of the updating and reconstruction method of the embodiment are:

[0037] 1) The original precast floor residual part is used as the node block 2 at the floor connecting part of the load-bearing wall 1, and the plate bottom stress reinforcement 31 of the new floor 7 on both sides of the load-bearing wall 1 is embedded in the hole of the node block 2. In this way, the new floor 7 newly poured and built can be firmly combined with the load-bearing wall 1 through the node block 2, the strength and stability of the connection between the new floor 7 and the load-bearing wall 1 are enhanced, the new cast-in-place structure floor can be built, and the bearing capacity of the reconstructed masonry structure floor is improved.

[0038] The updating and reconstruction method of the embodiment also has other advantages, as follows:

[0039] 2) The plate bottom stress reinforcement 31 of the new floor 7 on both sides of the load-bearing wall 1 is connected through the hole of the node block 2, so that the firm combination with the load-bearing wall 1 is further strengthened;

[0040] 3) The updating and reconstruction method of the embodiment uses the original precast floor residual part as the node block 2, and builds the new floor 7 based on the node block 2, so that the construction process can be simplified and the cost can be reduced;

[0041] 4) No temporary support is needed, the construction is convenient, the workload of site removal is reduced, the construction noise is reduced, the cost is low, the replaced floor can meet the requirements of building fire prevention, sound insulation, bearing, cleaning and the like, and the use space of the building is not affected;

[0042] 5) No temporary support is needed, the construction is convenient, the workload of site removal is reduced, the construction noise is reduced, the cost is low, the replaced floor can meet the requirements of building fire prevention, sound insulation, bearing, cleaning and the like, and the use space of the building is not affected;

[0043] 6) directly replace the original old prefabricated slab, re-cast structure floor, without increasing temporary support, convenient and efficient construction;

[0044] 7) can solve the old prefabricated slab surface layer is too thick, low strength and carbonization is serious, not suitable for reinforcement or reinforcement after reconstruction can not meet the subsequent design service life, reducing the construction workload and noise, meet the subsequent use requirements;

[0045] 8) can solve the old prefabricated slab thickness or insufficient plate bottom reinforcement, meet the structural load requirements, and without increasing the original floor section, increase the floor net height, provide conditions for optimizing the building scheme;

[0046] 9) using the plate bottom force steel directly embedded in the original prestressed porous plate hole, fine stone concrete filling, new cast concrete floor (7) surface steel bending, not only enhances the strength and stability of the floor and load-bearing wall connection, improves the overall structure of the carrying capacity, and convenient construction;

[0047] 10) the material used is only fine stone concrete, simple material, cost-effective, low cost;

[0048] 11) the old prefabricated slab is replaced by cast-in-place floor, good integrity, can meet the building fire requirements, has the function of sound insulation and noise reduction, and is easy to clean and maintain;

[0049] In summary, the updating and reconstruction method of the embodiment is used to transform the masonry structure floor, which has strong implementability, economy and applicability.

[0050] Embodiment 2:

[0051] Referring to Figure 3 , embodiment 2 provides an updating and reconstruction method based on masonry structure prefabricated slab, which has the same concept as the updating and reconstruction method provided by embodiment 1, and the difference is that:

[0052] In this embodiment 2, the load-bearing wall 1 is an outer wall, and the outer side is without floor. In this case, the newly built floor 7 on one side is only pre-buried in the hole of the node block 2, and the plate bottom force steel 31 is not connected with the plate bottom force steel 31 of the other side of the newly built floor 7.

[0053] The above is only a preferred embodiment of the present application, and is not used to limit the protection scope of the present application, therefore, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A renovation and upgrading method based on precast masonry floor slabs, characterized in that: The updating and renovation methods include: S1, cut off the original precast floor slab and leave the original precast floor slab residue in the load-bearing wall (1) as node block (2); S2, the steel bars (3) used for the new floor slab (7) are inserted into the holes of the node block (2); S3, the bottom reinforcing steel bars (31) of the slab are embedded in the holes, and the holes of the node block (2) are filled with fine stone concrete; S4, construct a new floor slab (7) based on the node block (2), and use the bottom reinforcing steel bars (31) embedded in the holes of the node block (2) as the bottom reinforcing steel bars of the new floor slab (7).

2. The renovation and upgrading method based on precast masonry floor slabs according to claim 1, characterized in that: The load-bearing wall (1) is an interior wall. Floor slabs are constructed on both sides of the load-bearing wall (1). The newly built floor slabs (7) on both sides of the load-bearing wall (1) are connected together by the bottom reinforcing steel bars (31).

3. The renovation and upgrading method based on precast masonry floor slabs according to claim 1, characterized in that: The load-bearing wall (1) is the exterior wall.

4. A renovation and upgrading structure based on precast masonry floor slabs, including load-bearing walls (1); Its features are: The updated and renovated structure also includes a node block (2), which is the original precast floor slab residue left in the load-bearing wall (1) after the original precast floor slab is cut off, and the node block (2) has holes; The upgraded structure also includes a new floor slab (7) constructed based on the node block (2), and the bottom reinforcing steel bars (31) of the new floor slab (7) are embedded in the holes of the node block (2).

5. The renovation and upgrading structure based on precast masonry floor slabs according to claim 4, characterized in that: The load-bearing wall (1) is an interior wall. Floor slabs are constructed on both sides of the load-bearing wall (1). The newly built floor slabs (7) on both sides of the load-bearing wall (1) are connected by the bottom reinforcing steel bars (31) through the holes of the node block (2).

6. The renovation and upgrading structure based on precast masonry floor slabs according to claim 4, characterized in that: The load-bearing wall (1) is the outer wall.

7. The renovation and upgrading structure based on precast masonry floor slabs according to claim 4, characterized in that: The bottom reinforcing steel bars (31) of the newly built floor slab (7) are embedded in the holes of the node block (2). Specifically, the bottom reinforcing steel bars (31) are embedded in the holes and the holes are filled with fine stone concrete.

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