Construction method of super-long concrete floor slab

Abstract

The application discloses a construction method of an ultra-long concrete floor slab, which replaces a telescopic post-poured belt with a pre-poured belt, the pre-poured belt is a precast component, and the pre-poured belt is chiseled on both sides and pre-buried with an extended water stop belt and a stress steel bar, the extended length of the stress steel bar meets subsequent anchoring requirements; during construction, the steel bars of columns and the formwork are first installed, then the support frames and the formwork of beams and floor slabs are installed, then the pre-poured belt is installed in place, then the steel bars of the beams and the floor slabs are installed, the stress steel bars on both sides of the floor slab part are connected with the steel bars of the floor slabs on both sides, and the stress steel bars on both sides of the floor-beam composite part are connected with the steel bars of the floor slabs and the beams on both sides, then the columns and the beams and the floor slabs on both sides of the pre-poured belt are poured at one time, and the formwork is removed after the concrete strength reaches a requirement. The method realizes one-time pouring of the whole floor slab, reduces pouring time, and avoids setting a telescopic post-poured belt.

Description

TECHNICAL FIELD

[0001] The present application relates to floor slab construction, in particular to a super-long concrete floor slab construction method. BACKGROUND

[0002] The super-long concrete structure is a reinforced concrete structure with a length exceeding the maximum interval limit of expansion joints. The current methods for controlling temperature cracks in the construction of super-long concrete floor slabs mainly include post-pouring strip method and skip-pouring method, wherein:

[0003] The post-pouring strip method involves leaving temporary construction joints at corresponding positions on the floor slab according to the design drawings, pouring concrete into the temporary construction joints after a certain period of time, and connecting the structure into a whole. This method requires protection, cleaning, and chiseling of the post-pouring strip, which invisibly increases the workload of the later construction and increases the risk of leakage.

[0004] The skip-pouring method involves dividing the super-long concrete structure into multiple units of a certain size and pouring concrete at intervals, wherein the interval between the pouring of concrete in adjacent units should not be less than 7 days. This results in the inability to continuously pour the entire layer of concrete structure at once to form a whole, and the need for a relatively long pouring time for each layer, which is not conducive to projects with tight schedules. SUMMARY

[0005] In view of the problems of the post-pouring strip method, such as the increase in workload and the risk of leakage, and the skip-pouring method, such as the need for a long pouring time which is not conducive to projects with tight schedules, the present application aims to provide a super-long concrete floor slab construction method. This method enables the entire layer of floor slab to be poured at once to form a whole, significantly reduces the pouring time, avoids the need for post-pouring strips, and reduces the workload of later construction and the risk of leakage.

[0006] The technical solution adopted by the present application is as follows:

[0007] A super-long concrete floor slab construction method replaces the post-pouring strip with a pre-pouring strip. The pre-pouring strip is a prefabricated component with chiseled sides and embedded water stop strips and stress reinforcement bars protruding from the sides. The stress reinforcement bars protrude to a length that meets the subsequent anchoring requirements. During construction, the steel reinforcement of the column and the formwork are installed first, followed by the installation of the support frame and formwork of the beam and floor slab. Then, the pre-pouring strip is installed in place, and the steel reinforcement of the beam and floor slab is installed. The stress reinforcement bars on both sides of the floor slab are connected to the steel reinforcement of the floor slab, and the stress reinforcement bars on both sides of the floor-beam composite part are connected to the steel reinforcement of the floor slab and the beam. The column and the beam and floor slab on both sides of the pre-pouring strip are poured at once, and the formwork is removed after the concrete reaches the required strength.

[0008] Preferably, the pre-pouring strip is divided into multiple segments along the length direction, and a chamfer is provided at the upper and lower openings between adjacent segments.

[0009] Preferably, after the formwork is removed, the polymer modified mortar is used to seal the chamfer along the early-poured belt.

[0010] Preferably, for the floor part, the water stop belt is located at the middle position of the early-poured belt side part, and the stress steel bar is located at the upper and lower positions of the early-poured belt side part; for the floor beam composite part, the water stop belt is located at the middle position of the early-poured belt side part floor area, and the stress steel bar is located at the upper and lower positions of the early-poured belt side part floor area and beam area.

[0011] Preferably, the stress steel bar transversely passes through the early-poured belt and extends from both ends of the early-poured belt.

[0012] Preferably, before construction, the theodolite or total station is used to draw the axis, side line and control line of the column and beam on the next floor slab according to the known control point and design drawing.

[0013] Preferably, the method for installing the column steel bar and the formwork is as follows: the embedded column steel bar is first corrected and is sleeved with a column hoop, then the vertical steel bar is lengthened and is connected and fixed, a marking pen is used to draw the hoop spacing on the vertical steel bar, the hoop is fixed with the vertical steel bar according to the spacing, and then the steel bar protection layer cushion is placed; after the acceptance is passed, the column formwork is installed, the sealing strip is first attached along the formwork side line, then the column piece formwork is erected, the column hoop is installed, and the squareness, perpendicularity and position of the column are corrected, and after the overall inspection and correction, the group is fixed.

[0014] Preferably, the method for installing the support frame and the formwork of the beam and floor is as follows: the support frame is erected according to the formwork engineering construction scheme, the support beam is first adjusted and is placed, then the beam bottom formwork is placed and is fixed, the beam bottom is arched according to the beam span length and design requirement, then the beam side formwork is installed, the line support is pulled on the side formwork, and then the beam formwork size, elevation and position are rechecked; then the floor formwork is laid, and is connected and fixed with the adjacent beam formwork, finally the formwork elevation, flatness and support firmness of the overall beam and floor are checked again.

[0015] Preferably, the method for installing the early-poured belt is as follows: the early-poured belt is transported to the construction site in advance according to the engineering progress plan, after the formwork engineering construction is completed, the side line of the early-poured belt position is first drawn on the formwork, the sealing strip is attached on the side line, and then the early-poured belt is installed in place by using the hoisting equipment.

[0016] Preferably, when the steel bar of the beam and floor is installed, the beam steel bar is first installed, and then the floor steel bar is installed.

[0017] The beneficial effects of the present application are as follows:

[0018] The method replaces the telescopic post-pouring belt with the pre-pouring belt, so that the whole floor slab is poured at one time to form a whole, greatly reduces the pouring time, avoids the telescopic post-pouring belt, has small construction quantity in later construction, has no leakage hidden danger, and divides the super-long floor slab structure into multiple sections, so that the problem of cracks of the super-long concrete floor slab structure due to temperature stress and temperature shrinkage is solved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a position diagram of the pre-pouring belt on the super-long concrete floor slab in the embodiment of the application.

[0020] Figure 2 is a transverse sectional view of the pre-pouring belt floor slab part and the two sides, wherein b is the width of the pre-pouring belt.

[0021] Figure 3 is a longitudinal sectional view of the pre-pouring belt, wherein L is the length of the pre-pouring belt, h is the thickness of the floor slab part, and H is the thickness of the floor beam composite part.

[0022] Figure 4 is a transverse sectional view of the pre-pouring belt floor slab part.

[0023] Figure 5 is a transverse sectional view of the pre-pouring belt floor beam composite part.

[0024] Figure 6 is a splicing diagram between adjacent sections of the pre-pouring belt in the embodiment of the application.

[0025] In the figure: 1-column; 2-main beam; 3-pre-pouring belt; 31-floor slab part; 32-floor beam composite part; 4-secondary beam; 5-floor slab; 6-water stop belt; 7-force steel bar; 8-chamfer. DETAILED DESCRIPTION

[0026] The application will be further described below in combination with the drawings and embodiments.

[0027] The embodiment discloses a super-long concrete floor slab construction method, as shown in the figure, and the principle is to replace the telescopic post-pouring belt with a pre-pouring belt 3, as shown in the figures, the pre-pouring belt 3 is a floor slab part 31 in the area of the pure floor slab 5 and is a floor beam composite part 32 in the area where the floor slab 5 intersects with the beam, the pre-pouring belt 3 is a prefabricated component, the two sides are roughened, and the water stop belt 6 and the force steel bar 7 are pre-buried and protrude, the protruding length of the force steel bar 7 meets the subsequent anchoring requirement; and the specific steps are as follows. Figure 1 Figure 4 Figure 5

[0028] S1, measurement and line laying

[0029] ​​​Theodolite or total station is used to draw the axis, edge line and control line of the column 1 and beam on the next floor slab according to the known control points and design drawings.

[0030] S2, installing the steel bars and formwork of the column 1

[0031] First, the embedded column steel bars are corrected and the column hoop is sleeved, then the vertical bars are lengthened and connected and fixed, the hoop spacing is drawn on the vertical bars with a marker pen, the hoop is fixed with the vertical bars according to the spacing, and then the steel reinforcement protection layer cushion is placed; after the acceptance, the column 1 formwork installation is started, the sealing strip is pasted along the formwork edge line, then the column 1 piece form is erected, and then the column hoop is installed, and the squareness, perpendicularity and position of the column 1 are corrected, and after the overall inspection and correction, the group is fixed.

[0032] S3, installing the support frame and formwork of the beam and floor 5

[0033] The support frame is erected according to the formwork engineering construction scheme, the joist is adjusted and the support beam is placed, then the beam bottom formwork is placed and fixed, the arch is erected at the beam bottom according to the beam span length and design requirements, then the beam side formwork is installed, the line support is pulled on the side formwork (beam height plus counter-bolt), then the beam formwork size, elevation and position are rechecked; then the floor 5 formwork is laid, which is connected and fixed with the formwork of the adjacent beam, finally the formwork elevation, flatness and support firmness of the overall beam and floor 5 are checked again.

[0034] S4, installing the early poured strip 3

[0035] The early poured strip 3 is transported to the construction site in advance according to the engineering progress plan, after the formwork engineering construction is completed, the edge line of the early poured strip 3 position is drawn on the formwork, the sealing strip is pasted on the edge line, and then the early poured strip 3 is installed in place using the hoisting equipment.

[0036] S5, installing the steel bars of the beam and floor 5

[0037] The beam steel bars are installed first, and then the floor 5 steel bars are installed, as shown in Figure 2 and Figure 3 , so that the stress steel bars 7 on both sides of the floor part 31 are respectively connected with the floor 5 steel bars on both sides, and the stress steel bars 7 on both sides of the beam and floor composite part 32 are respectively connected with the steel bars of the floor 5 and the beam on both sides.

[0038] S6, pouring and removing the formwork

[0039] The column 1 and the beam and floor 5 on both sides of the early poured strip 3 are poured at one time, and then the formwork is removed after the concrete strength reaches the requirement.

[0040] As shown in Figure 1As shown, in this embodiment, preferably: the precast strip 3 is divided into multiple sections along the length direction and chamfers 8 are set at the upper and lower ends between adjacent sections. The number of sections can be set according to the lifting capacity, and the chamfers 8 avoid bumps during lifting; after demolding, the chamfers 8 along the precast strip 3 can be sealed with polymer modified mortar.

[0041] like Figure 4 and Figure 5 As shown, in this embodiment, preferably: for the floor portion 31, the waterstop 6 is located in the middle position of the side of the precast strip 3, and the stress-bearing steel bars 7 are located in the upper and lower positions of the side of the precast strip 3; for the floor-beam composite portion 32, the waterstop 6 is located in the middle position of the floor area on the side of the precast strip 3, and the stress-bearing steel bars 7 are located in the upper and lower positions of the floor area and the beam area on the side of the precast strip 3, which can ensure the water-stopping and connection effects; the stress-bearing steel bars 7 pass through the precast strip 3 horizontally and extend from both ends of the precast strip 3, which can improve the stress-bearing performance.

[0042] This method replaces the expansion joint with the pre-cast joint 3, which allows the entire floor panel to be cast at one time to form a whole, greatly reducing the casting time, and avoids leaving the expansion joint. The later construction workload is small and there is no leakage risk. In addition, the super-long floor panel structure is divided into multiple sections, solving the problem that the super-long concrete floor panel structure is prone to cracks due to temperature stress and temperature shrinkage.

[0043] The embodiments described above are part of the embodiments of the present application, rather than all of the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

Claims

1. A method of constructing an ultra-long concrete floor slab, characterized by: The telescopic post-cast strip is replaced by a pre-cast strip, the pre-cast strip is a pre-cast component and is chiseled on both sides and pre-buried with an extended water stop strip and stress reinforcement, the stress reinforcement has an extended length meeting the subsequent anchoring requirements; during construction, the steel reinforcement and formwork of the column are installed first, then the support frame and formwork of the beam and floor are installed, then the pre-cast strip is installed in place, then the steel reinforcement of the beam and floor is installed, the stress reinforcement on both sides of the floor part is connected with the steel reinforcement of the floor on both sides respectively, the stress reinforcement on both sides of the beam-floor composite part is connected with the steel reinforcement of the beam and floor on both sides respectively, then the column and the beam and floor on both sides of the pre-cast strip are poured at one time, and then the formwork is removed after the concrete strength reaches the requirement; The pre-cast strip is divided into multiple sections along the length direction and a chamfer is arranged at the upper and lower openings between adjacent sections; After the formwork is removed, the chamfer along the pre-cast strip is closed by using polymer modified mortar; For the floor part, the water stop strip is located at the middle position of the side part of the pre-cast strip, and the stress reinforcement is located at the upper and lower positions of the side part of the pre-cast strip; for the beam-floor composite part, the water stop strip is located at the middle position of the floor area of the side part of the pre-cast strip, and the stress reinforcement is located at the upper and lower positions of the floor area and the beam area of the side part of the pre-cast strip; The stress reinforcement transversely penetrates through the pre-cast strip and extends from both ends of the pre-cast strip; The method for installing the pre-cast strip is that the pre-cast strip is transported to the construction site in advance according to the engineering progress plan, after the formwork engineering construction is completed, the edge line of the pre-cast strip position is drawn on the formwork first, the sealing strip is pasted on the edge line, and then the pre-cast strip is installed in place by using the hoisting equipment.

2. The method of constructing an ultra-long concrete floor slab of claim 1, wherein: Before construction, the column and beam axes, edge lines and control lines are measured and drawn on the next floor slab according to the known control points and design drawings by using the theodolite or total station.

3. The method of constructing an ultra-long concrete floor slab of claim 1, wherein, The method for installing the steel reinforcement and formwork of the column is that the embedded column steel reinforcement is first corrected and is sleeved with the column hoop, then the vertical reinforcement is lengthened and is connected and fixed, the marker pen is used to draw the hoop spacing on the vertical reinforcement, the hoop is fixed with the vertical reinforcement according to the spacing, and then the steel reinforcement protection layer cushion block is placed; after the acceptance is qualified, the column formwork is installed, the sealing strip is pasted along the formwork edge line first, then the column piece formwork is erected, the column hoop is installed, and the squareness, perpendicularity and position of the column are corrected at the same time, after the overall inspection and correction, the group is fixed.

4. The method of constructing an ultra-long concrete floor slab of claim 1, wherein, The method for installing the support frame and formwork of the beam and floor is that the support frame is erected according to the formwork engineering construction scheme, the support beam is adjusted and placed first, then the beam bottom formwork is placed and fixed, the arch is formed at the beam bottom according to the beam span length and design requirement, then the beam side formwork is installed, the line support is pulled on the side formwork, then the beam formwork size, elevation and position are reviewed; then the floor formwork is paved, and is connected and fixed with the adjacent beam formwork, finally the formwork is cleaned and oiled, and the formwork elevation, flatness and support firmness of the overall beam and floor are checked again.

5. The method of constructing an ultra-long concrete floor slab of claim 1, wherein: When the steel reinforcement of the beam and floor is installed, the beam steel reinforcement is installed first, and then the floor steel reinforcement is installed.

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