Basement building method with top plate provided with post-cast strip

Abstract

The invention provides a basement building method with a top plate provided with a post-cast strip. The method comprises the steps that firstly, a pre-cast part of a basement bottom plate is cast; secondly, a basement top plate pouring formwork is built; thirdly, pouring the pre-poured part of the basement roof; fourthly, concrete is poured into the notches of the bottom plate post-cast strip to form the bottom plate post-cast strip; fifthly, prestress is applied; and fifthly, a top plate post-cast strip is poured. The device has the effect of applying prestress to the left basement reinforced concrete top plate and the right basement reinforced concrete top plate before pouring the basement bottom plate post-pouring belt; the problem that a left basement reinforced concrete top plate and a right basement reinforced concrete top plate of an existing basement bottom plate are prone to cracking after a support is dismantled is solved.

Description

Technical Field

[0001] The invention relates to the technical field of construction engineering, and in particular to a basement construction method with a post-cast strip on the top plate. Background Art

[0002] Post-cast strips are concrete strips left at the corresponding positions of the foundation slab, top slab, wall, beam and other structures to adapt to factors such as environmental temperature changes, concrete shrinkage, and uneven structural settlement. They can connect the temporarily separated concrete structures on both sides into a whole. At present, the post-cast strips of the basement top slab are cast with a higher grade of micro-expansive concrete to reduce cracks caused by shrinkage stress. After the bracket is removed, the internal tensile stress of the beams and slabs on both sides of the post-cast strips exceeds the tensile strength of the concrete under the action of gravity, resulting in cracks and leakage at the root of the beams and slabs, affecting the construction quality, and there are safety hazards in the overall structure. Summary of the invention

[0003] The present invention aims to provide a basement construction method in which prestressed top slabs are provided on left and right basement reinforced concrete top slabs before pouring the basement floor post-cast strips, thereby solving the problem that the left and right basement reinforced concrete top slabs are prone to cracking after the support of the existing basement floor is removed.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technologies: a basement construction method with a post-cast strip on the top plate, the first step is to cast the first cast part of the basement bottom plate: cast the left basement reinforced concrete bottom plate and the right basement reinforced concrete bottom plate, and form a gap of the bottom plate post-cast strip between the left basement reinforced concrete bottom plate and the right basement reinforced concrete bottom plate; the second step is to build a basement top plate casting template: build a left support frame on the left basement reinforced concrete bottom plate, build a right support frame on the right basement reinforced concrete bottom plate, and lay the top plate template plate body on the left support frame and the right support frame; the third step is to cast the first cast part of the basement top plate Step 4: build a steel frame of the left basement reinforced concrete top plate and a steel frame of the right basement reinforced concrete top plate on the top plate formwork body, pour concrete on the steel frame of the left basement reinforced concrete top plate to form the left basement reinforced concrete top plate, pour concrete on the steel frame of the right basement reinforced concrete top plate to form the left basement reinforced concrete top plate, and form a top plate post-casting strip gap between the left basement reinforced concrete top plate and the right basement reinforced concrete top plate; Step 4: pour concrete in the gap of the bottom plate post-casting strip to form the bottom plate post-casting strip; Step 5: apply prestress: drive the left basement reinforced concrete top plate through a plurality of transverse telescopic mechanisms The reinforced concrete top slab of the lower room and the reinforced concrete top slab of the right basement are separated, so that the reinforced concrete top slab of the left basement and the reinforced concrete top slab of the right basement are prestressed; the fifth step is to cast the top slab post-cast strip: an isolation plate is installed on both sides of the length direction of the notch of the top slab post-cast strip of each transverse telescopic mechanism, and the two isolation plates on both sides of the same transverse telescopic mechanism form an isolation plate pair, and the isolation plates are abutted against the reinforced concrete top slab of the left basement and the reinforced concrete top slab of the right basement. The isolation plate pair isolates a number of first casting spaces of the top slab post-cast strip in the notch of the top slab post-cast strip, and in the first casting spaces of the top slab post-cast strip The poured concrete solidifies to form the first part of the top slab post-casting strip, and the second pouring space of the top slab post-casting strip is formed between the adjacent first parts of the top slab post-casting strip. The lateral telescopic mechanism is removed, and the elastic deformation and rebound of the left basement reinforced concrete top slab and the right basement reinforced concrete top slab make the first part of the top slab post-casting strip bear pressure, and at the same time, compressive stress is formed in the left basement reinforced concrete top slab and the right basement reinforced concrete top slab, so as to avoid cracking of the left basement reinforced concrete top slab and the right basement reinforced concrete top slab. The poured concrete solidifies in the second pouring space of the top slab post-casting strip to form the second part of the top slab post-casting strip, thereby completing the pouring of the top slab post-casting strip. The technical solution applies prestress and then casts the top slab post-casting strip, so as to avoid cracking of the left basement reinforced concrete top slab and the right basement reinforced concrete top slab. After the basement bottom slab supports the mold and casts the left basement reinforced concrete top slab and the right basement reinforced concrete top slab, the bottom slab post-casting strip is cast, so as to avoid cracking between the basement bottom slab and the bottom slab post-casting strip caused by the basement bottom slab bearing load during the pouring of the basement top slab.

[0005] Preferably, a left isolation net is cast on the end surface of the notch side wall of the top plate post-casting strip formed by the left basement reinforced concrete top plate, and a right isolation net is cast on the end surface of the notch side wall of the top plate post-casting strip formed by the right basement reinforced concrete top plate. The isolation net can make the top plate post-casting strip and the basement reinforced concrete top plate more reliably cast together.

[0006] As a preferred embodiment, the left isolation net is a steel structure, and the left isolation net is welded to the steel frame of the left basement reinforced concrete top plate, and the right isolation net is a steel structure, and the right isolation net is welded to the steel frame of the right basement reinforced concrete top plate. The connection is reliable.

[0007] Preferably, the left basement reinforced concrete top plate and the right basement reinforced concrete top plate are connected together by a plurality of connecting steel bars, so that prestressing can be generated more reliably and cracking can be avoided.

[0008] Preferably, in the fifth step, one end of the transverse telescopic mechanism abuts against the left basement reinforced concrete top plate through the left supporting vertical steel plate, and the other end abuts against the right basement reinforced concrete top plate through the right supporting vertical steel plate, so that the left basement reinforced concrete top plate and the right basement reinforced concrete top plate are not easily damaged when the transverse telescopic mechanism is stretched to generate prestress.

[0009] Preferably, the upper ends of the left supporting vertical steel plate and the right supporting vertical steel plate extend upward beyond the notch of the top plate post-casting strip, and the lower ends pass through the top plate formwork body. The lower ends of the left supporting vertical steel plate and the right supporting vertical steel plate are connected together by a connecting rod located below the top plate formwork body. The connecting rod is provided with a left limit block abutting against the left supporting vertical steel plate and a right limit block abutting against the right supporting vertical steel plate. The transverse telescopic mechanism abuts against the upper ends of the left supporting vertical steel plate and the right supporting vertical steel plate. When the transverse telescopic mechanism is removed, the left supporting vertical steel plate and the right supporting vertical steel plate are also removed, so that when the thickness of the basement top plate is smaller than the cross-sectional area of ​​the transverse telescopic mechanism, the transverse telescopic mechanism can also reliably apply prestress to the left basement reinforced concrete top plate and the right basement reinforced concrete top plate.

[0010] Preferably, the left support frame includes a left first support frame and a left second support frame, which are independently arranged between the left first support frame and the left second support frame, and the right support frame includes a right first support frame and a right second support frame, which are independently arranged between the right first support frame and the right second support frame, and the left second support frame and the right second support frame are located between the right first support frame and the left first support frame; after the third step, the left first support frame and the right second support frame are removed. This allows the left and right support frames to be turned around before the basement top plate is poured, saving costs.

[0011] Preferably, after the fourth step, an intermediate support frame is firstly connected to the bottom plate post-casting strip to support the top plate formwork body, and then the top plate post-casting strip is cast, which can improve the support reliability.

[0012] Preferably, the isolation plate is provided with a plurality of top plate post-casting strip notch bosses on both sides along the length direction of the top plate post-casting strip notch, so as to improve the connection reliability between the first cast part and the later cast part of the top plate post-casting strip.

[0013] Beneficial effect: prestress can be applied before pouring the post-cast strip of the basement slab, thereby avoiding cracks in the basement top slab; cracks are not easy to occur between the basement basement slab and the post-cast strip of the basement slab. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the left support frame and the right support frame being connected; Figure 2 This is a schematic diagram of the left basement reinforced concrete top slab and the right basement reinforced concrete top slab after pouring; Figure 3 It is a front view schematic diagram when applying prestress; Figure 4 This is a top view schematic diagram when prestressing is applied.

[0015] In the figure: left basement reinforced concrete top plate 1, right basement reinforced concrete top plate 2, top plate post-cast strip notch 3, connecting steel bars 4, lateral telescopic mechanism 7, hydraulic station 8, isolation plate 9, top plate post-cast strip first pouring space 10, left supporting vertical steel plate 11, right supporting vertical steel plate 12, top plate mold plate body 13, connecting rod 15, left limit block 16, right limit block 17, left isolation net 18, right isolation net 19, left basement reinforced concrete bottom plate 20, right basement reinforced concrete bottom plate 21, bottom plate post-cast strip notch 22, left support frame 23, right support frame 24, left basement reinforced concrete top plate steel skeleton 25, right basement reinforced concrete top plate steel skeleton 26, bottom plate post-cast strip 27, left first support frame 29, left second support frame 30, right first support frame 31, right second support frame 32, middle support frame 33. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0017] See also Figures 1 to 4, a method for building a basement with a post-cast strip on the top plate, which is completed by a prestressed device. The prestressed device includes a left basement reinforced concrete top plate 1 and a right basement reinforced concrete top plate 2, the left basement reinforced concrete top plate and the right basement reinforced concrete top plate are disconnected to form a top plate post-cast strip notch 3, the left basement reinforced concrete top plate and the right basement reinforced concrete top plate are connected together by a plurality of connecting steel bars 4, and the connecting steel bars are distributed along the length direction of the top plate post-cast strip notch. It also includes a plurality of transverse telescopic mechanisms 7 and a plurality of isolation plate pairs. The transverse telescopic mechanism is a hydraulic cylinder, and the hydraulic rod is connected to the hydraulic station 8. The two isolation plates 9 of the isolation plate pair are distributed along the length direction of the top plate post-cast strip notch, and the two ends of the isolation plates of the isolation plate pair are respectively abutted on the left basement reinforced concrete top plate and the right basement reinforced concrete top plate. The transverse telescopic mechanism is located between the two isolation plates in the isolation plate pair in a one-to-one correspondence. The area where the top plate post-cast strip notch is located outside the isolation plate pair forms a first pouring space 10 for the top plate post-cast strip. One end of the transverse telescopic mechanism is abutted against the left basement reinforced concrete top plate through the left support vertical steel plate 11, and the other end is abutted against the right basement reinforced concrete top plate through the right support vertical steel plate 12. The upper ends of the left support vertical steel plate and the right support vertical steel plate are upwardly extended beyond the notch of the top plate post-casting strip, and the lower ends are downwardly extended through the top plate mold plate body 13 beyond the notch of the top plate post-casting strip. The lower ends of the left support vertical steel plate and the right support vertical steel plate are connected together by a connecting rod 15, and the connecting rod is a threaded rod. The connecting rod is provided with a left limit block 16 abutting against the left support vertical steel plate and a right limit block 17 abutting against the right support vertical steel plate, and the left limit block and the right limit block are both threadedly connected to the connecting rod. The transverse telescopic mechanism is abutted against the upper ends of the left support vertical steel plate and the right support vertical steel plate. When removing the transverse telescopic mechanism, the left support vertical steel plate and the right support vertical steel plate are also removed. It also includes a left isolation net 18 located on the end surface of the side plate of the notch of the top plate post-casting strip formed by the left basement reinforced concrete top plate and a right isolation net 19 located on the end surface of the side plate of the notch of the top plate post-casting strip formed by the right basement reinforced concrete top plate. The left isolation net and the right isolation net have the same structure. The left isolation net includes a mesh cast together with the left basement reinforced concrete top plate and a frame connected to the side of the mesh connected to the left supporting vertical steel plate. Both the left isolation net and the right isolation net are steel structures. A plurality of top plate post-casting strip notch bosses are provided on both sides of the isolation plate along the length direction of the notch of the top plate post-casting strip. The isolation plate is a steel structure.

[0018] The method for pouring a basement by a prestressed device is as follows: the first step is to pour the first part of the basement bottom slab: pour the left basement reinforced concrete bottom slab 20 and the right basement reinforced concrete bottom slab 21, and form a bottom slab post-casting strip gap 22 between the left basement reinforced concrete bottom slab and the right basement reinforced concrete bottom slab; the second step is to build a basement top slab casting template: build a left support frame 23 on the left basement reinforced concrete bottom slab, build a right support frame 24 on the right basement reinforced concrete bottom slab, and lay the top slab template plate body 13 on the left support frame and the right support frame; the third step is to pour the first part of the basement top slab: on the top slab A left basement reinforced concrete top plate steel frame 25 and a right basement reinforced concrete top plate steel frame 26 are built on the template plate body, concrete is poured on the left basement reinforced concrete top plate steel frame to form the left basement reinforced concrete top plate, and concrete is poured on the right basement reinforced concrete top plate steel frame to form the left basement reinforced concrete top plate, and a top plate post-casting strip notch is formed between the left basement reinforced concrete top plate and the right basement reinforced concrete top plate; the fourth step is to pour concrete in the bottom plate post-casting strip notch to form the bottom plate post-casting strip 27; the fifth step is to apply prestress: drive the left basement reinforced concrete top plate through a plurality of transverse telescopic mechanisms The basement reinforced concrete top slab and the right basement reinforced concrete top slab are separated to make the left basement reinforced concrete top slab and the right basement reinforced concrete top slab prestressed; the fifth step is to cast the top slab post-cast strip: an isolation plate is installed on both sides of the length direction of the notch of the top slab post-cast strip of each transverse telescopic mechanism, and the two isolation plates on both sides of the same transverse telescopic mechanism form an isolation plate pair, and the isolation plates are abutted against the left basement reinforced concrete top slab and the right basement reinforced concrete top slab, and the isolation plate pair isolates a number of top slab post-cast strip first casting spaces in the notch of the top slab post-cast strip, and in the first casting space of the top slab post-cast strip The poured concrete solidifies to form the first part of the top slab post-casting strip, and the second pouring space of the top slab post-casting strip is formed between the adjacent first parts of the top slab post-casting strip. The lateral telescopic mechanism is removed, and the elastic deformation and rebound of the left basement reinforced concrete top slab and the right basement reinforced concrete top slab make the first part of the top slab post-casting strip bear pressure, and at the same time, compressive stress is formed in the left basement reinforced concrete top slab and the right basement reinforced concrete top slab, so as to avoid the cracking of the left basement reinforced concrete top slab and the right basement reinforced concrete top slab. The poured concrete solidifies in the second pouring space of the top slab post-casting strip to form the second part of the top slab post-casting strip, thereby completing the pouring of the top slab post-casting strip. This technical solution applies prestressing to cast the top slab post-casting strip, so as to avoid the cracking of the left basement reinforced concrete top slab and the right basement reinforced concrete top slab. In the third step, a left isolation net is poured on the end face of the side wall of the notch of the top slab post-casting strip formed by the left basement reinforced concrete top slab, and a right isolation net is poured on the end face of the side wall of the notch of the top slab post-casting strip formed by the right basement reinforced concrete top slab.The left isolation net is a steel structure, and the left isolation net is welded to the steel skeleton of the left basement reinforced concrete top plate. The right isolation net is a steel structure, and the right isolation net is welded to the steel skeleton of the right basement reinforced concrete top plate. One end of the transverse telescopic mechanism is abutted against the left basement reinforced concrete top plate through the left support vertical steel plate, and the other end is abutted against the right basement reinforced concrete top plate through the right support vertical steel plate. The upper ends of the left support vertical steel plate and the right support vertical steel plate extend upward beyond the notch of the top plate post-casting strip, and the lower ends pass through the top plate formwork body. The lower ends of the left support vertical steel plate and the right support vertical steel plate are connected together through a connecting rod located below the top plate formwork body. The connecting rod is provided with a left limit block abutting against the left support vertical steel plate and a right limit block abutting against the right support vertical steel plate. The transverse telescopic mechanism abuts against the upper ends of the left support vertical steel plate and the right support vertical steel plate. The left support frame includes a left first support frame 29 and a left second support frame 30, which are independently arranged between the left first support frame and the left second support frame. The right support frame includes a right first support frame 31 and a right second support frame 32, which are independently arranged between the right first support frame and the right second support frame, and the left second support frame and the right second support frame are located between the right first support frame and the left first support frame. After the third step, the left first support frame and the right second support frame are removed. After the fourth step, the middle support frame 33 is first overlapped on the bottom plate post-casting strip to support the top plate formwork body, and then the top plate post-casting strip is cast. A plurality of top plate post-casting strip notch convex columns are provided on both sides of the isolation plate along the length direction of the notch of the top plate post-casting strip.

[0019] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0020] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for building a basement with a post-cast strip on the top plate, characterized in that: Step 1: Cast the basement slab. Cast the first part: Cast the left basement reinforced concrete slab and the right basement reinforced concrete slab, and form a gap between the left basement reinforced concrete slab and the right basement reinforced concrete slab. Step 2: Build the basement top slab casting formwork: build a left support frame on the left basement reinforced concrete bottom slab, build a right support frame on the right basement reinforced concrete bottom slab, and lay the top slab formwork plate on the left support frame and the right support frame; The third step is to cast the first part of the basement top slab: build the steel frame of the left basement reinforced concrete top slab and the steel frame of the right basement reinforced concrete top slab on the top slab formwork plate body, pour concrete on the steel frame of the left basement reinforced concrete top slab to form the left basement reinforced concrete top slab, pour concrete on the steel frame of the right basement reinforced concrete top slab to form the left basement reinforced concrete top slab, and form a top slab post-casting strip gap between the left basement reinforced concrete top slab and the right basement reinforced concrete top slab; the fourth step is to pour concrete in the gap of the bottom slab post-casting strip to form the bottom slab post-casting strip; the fifth step is to apply prestress: drive the left basement reinforced concrete top slab and the right basement reinforced concrete top slab to separate through a number of transverse telescopic mechanisms so that the left basement reinforced concrete top slab and the right basement reinforced concrete top slab generate prestress; the fifth step is to cast the top slab post-casting strip: assemble each transverse telescopic mechanism on both sides of the length direction of the top slab post-casting strip gap The upper isolation plate and the two isolation plates on both sides of the same transverse telescopic mechanism form an isolation plate pair, the isolation plates are abutted against the left basement reinforced concrete top plate and the right basement reinforced concrete top plate, the isolation plate pair isolates a number of top plate post-casting strip first pouring spaces in the top plate post-casting strip notch, concrete is poured and solidified in the first pouring space of the top plate post-casting strip to form the first part of the top plate post-casting strip, and the second pouring space of the top plate post-casting strip is formed between adjacent first parts of the top plate post-casting strip, and the transverse telescopic mechanism is removed, the left basement reinforced concrete top plate and the right basement reinforced concrete top plate elastically deform and rebound, so that the first part of the top plate post-casting strip is under pressure, and at the same time, compressive stress is formed in the left basement reinforced concrete top plate and the right basement reinforced concrete top plate to avoid cracking of the left basement reinforced concrete top plate and the right basement reinforced concrete top plate, and concrete is poured and solidified in the second pouring space of the top plate post-casting strip to form the second part of the top plate post-casting strip, thereby completing the pouring of the top plate post-casting strip.

2. A basement construction method with a post-cast strip on the top plate according to claim 1, characterized in that: A left isolation net is cast on the end face of the side wall of the notch of the top slab post-cast strip formed by the reinforced concrete top slab of the left basement, and a right isolation net is cast on the end face of the side wall of the notch of the top slab post-cast strip formed by the reinforced concrete top slab of the right basement.

3. A method for building a basement with a post-cast strip on the top plate according to claim 2, characterized in that: The left isolation net is a steel structure, which is welded together with the steel frame of the left basement reinforced concrete top plate; the right isolation net is a steel structure, which is welded together with the steel frame of the right basement reinforced concrete top plate.

4. A method for building a basement with a post-cast strip on the top plate according to claim 1, 2 or 3, characterized in that: The left basement reinforced concrete top slab and the right basement reinforced concrete top slab are connected together by a plurality of connecting steel bars.

5. A method for building a basement with a post-cast strip on the top plate according to claim 1, 2 or 3, characterized in that: In the fifth step, one end of the transverse telescopic mechanism abuts against the left basement reinforced concrete top plate through the left supporting vertical steel plate, and the other end abuts against the right basement reinforced concrete top plate through the right supporting vertical steel plate.

6. A method for building a basement with a post-cast strip on the top plate according to claim 5, characterized in that: The upper ends of the left supporting vertical steel plate and the right supporting vertical steel plate extend upward beyond the notch of the top slab post-casting strip, and the lower ends pass through the top slab formwork body. The lower ends of the left supporting vertical steel plate and the right supporting vertical steel plate are connected together by a connecting rod located below the top slab formwork body. The connecting rod is provided with a left limit block abutting against the left supporting vertical steel plate and a right limit block abutting against the right supporting vertical steel plate. The transverse telescopic mechanism abuts against the upper ends of the left supporting vertical steel plate and the right supporting vertical steel plate.

7. A method for building a basement with a post-cast strip on the top plate according to claim 1, 2 or 3, characterized in that: The left support frame includes a left first support frame and a left second support frame, and the left first support frame and the left second support frame are independently arranged. The right support frame includes a right first support frame and a right second support frame, and the right first support frame and the right second support frame are independently arranged. The left second support frame and the right second support frame are located between the right first support frame and the left first support frame; after the third step, the left first support frame and the right second support frame are removed.

8. A method for building a basement with a post-cast strip on the top plate according to claim 7, characterized in that: After the fourth step, first overlap the middle support frame on the bottom plate post-cast strip to support the top plate formwork body, and then cast the top plate post-cast strip.

9. A method for building a basement with a post-cast strip on the top plate according to claim 1, 2 or 3, characterized in that: The isolation plate is provided with a plurality of top plate post-cast strip notch convex columns on both sides along the length direction of the top plate post-cast strip notch.

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