Prestress device for pouring post-cast strip of basement roof

Abstract

The utility model provides a prestress device for pouring a post-cast strip of a basement top plate, which comprises a plurality of transverse telescopic mechanisms and a plurality of isolation plate pairs, and two ends of isolation plates of the isolation plate pairs are respectively abutted against a left basement reinforced concrete top plate and a right basement reinforced concrete top plate. The transverse telescopic mechanisms are located between the two isolation plates in the isolation plate pair in a one-to-one correspondence mode, the left supporting vertical steel plate and the right supporting vertical steel plate are also located between the isolation plate pair, and the top plate post-cast strip notch is located in the area outside the isolation plates to form a top plate post-cast strip first pouring space. The pre-stress device has the effect of applying pre-stress to the left basement reinforced concrete top plate and the right basement reinforced concrete top plate before the basement bottom plate post-cast strip is poured; a tool is provided for solving the problem that a left basement reinforced concrete top plate and a right basement reinforced concrete top plate are prone to cracking after a support of an existing basement bottom plate is detached.

Description

Technical Field

[0001] The utility model relates to the technical field of construction engineering, in particular to a prestressed device for pouring a post-cast strip of a basement top plate. Background Art

[0002] Post-cast strips are concrete strips placed in corresponding locations on the foundation slab, roof, walls, beams, and other structures to accommodate factors such as temperature fluctuations, concrete shrinkage, and uneven structural settlement. They connect the temporarily separated concrete structures into a single unit. Currently, post-cast strips on basement roofs are constructed using a higher-grade, slightly expansive concrete to reduce cracks caused by shrinkage stress. However, after the support structures are removed, the tensile stresses in the beams and slabs on either side of the post-cast strips, under the influence of gravity, exceed the tensile strength of the concrete. This can lead to cracks and leakage at the base of the beams and slabs, compromising construction quality and posing safety risks to the overall structure. Utility Model Content

[0003] The utility model aims to provide a prestressing device for pouring the basement top slab post-cast strip, which applies prestress to the left basement reinforced concrete top slab and the right basement reinforced concrete top slab before pouring the basement bottom slab post-cast strip, and provides a tool to solve the problem that the left basement reinforced concrete top slab and the right basement reinforced concrete top slab are prone to cracking after the support of the existing basement bottom slab is removed.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technology: a prestressed device for pouring a basement top slab post-casting strip, comprising a left basement reinforced concrete top slab and a right basement reinforced concrete top slab, the left basement reinforced concrete top slab and the right basement reinforced concrete top slab are disconnected to form a top slab post-casting strip notch, 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, and the connecting steel bars are distributed along the length direction of the top slab post-casting strip notch, characterized in that it comprises a plurality of transverse telescopic mechanisms and a plurality of isolation plate pairs, the two isolation plates of the isolation plate pairs are distributed along the length direction of the top slab post-casting strip notch, the two ends of the isolation plates of the isolation plate pairs are respectively abutted against the left basement reinforced concrete top slab and the right basement reinforced concrete top slab, the transverse telescopic mechanisms are located one-to-one between the two isolation plates in the isolation plate pairs, the left supporting vertical steel plate and the right supporting vertical steel plate are also located between the isolation plate pairs, and the top slab post-casting strip notch is located in the area outside the isolation plate pairs to form a first pouring space for the top slab post-casting strip. When in use, the transverse telescopic mechanism is extended to apply prestress to the left basement reinforced concrete top plate and the right basement reinforced concrete top plate, and then an isolation plate is assembled on both sides of the length direction of the notch of the top plate post-casting strip of each transverse telescopic mechanism. The two isolation plates form an isolation plate pair, and the isolation plates are in contact with the left basement reinforced concrete top plate and the right basement reinforced concrete top plate to isolate the first pouring space of the top plate post-casting strip in the notch of the top plate post-casting strip. Concrete is poured in the first pouring space of the top plate post-casting strip and solidified. The first part of the top slab post-cast strip is formed, and the second pouring space of the top slab post-cast strip is formed between the first parts of the top slab post-cast strip of the box girder. The horizontal expansion 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-cast strip bear pressure, and at the same time, compressive stress is formed in the concrete slabs on both sides to avoid cracking of the left basement reinforced concrete top slab and the right basement reinforced concrete top slab. Concrete is poured in the second pouring space of the top slab post-cast strip and solidified to form the second part of the top slab post-cast strip, thereby completing the pouring of the top slab post-cast strip.

[0005] Preferably, one end of the transverse telescopic mechanism abuts against the left basement reinforced concrete top plate through a left supporting vertical steel plate, and the other end abuts against the right basement reinforced concrete top plate through a right supporting vertical steel plate.

[0006] Preferably, the upper ends of the left and right supporting vertical steel plates extend upward beyond the notch of the top slab post-casting strip, while the lower ends extend downward beyond the notch of the top slab post-casting strip. The lower ends of the left and right supporting vertical steel plates are connected together by a connecting rod, and the connecting rod is provided with a left limit block that abuts the left supporting vertical steel plate and a right limit block that abuts the right supporting vertical steel plate. The transverse telescopic mechanism abuts against the upper ends of the left and right supporting vertical steel plates. When the transverse telescopic mechanism is removed, the left and right supporting vertical steel plates are also removed. This allows the transverse telescopic mechanism to reliably apply prestress to the left and right basement reinforced concrete top plates even when the thickness of the basement top plate is smaller than the cross-sectional area of ​​the transverse telescopic mechanism.

[0007] Preferably, the system further includes a left isolation net located on the end surface of the notched side panel of the top slab post-cast strip of the left basement reinforced concrete top slab, and a right isolation net located on the end surface of the notched side panel of the top slab post-cast strip of the right basement reinforced concrete top slab. The isolation nets ensure a more reliable connection between the top slab post-cast strip and the basement reinforced concrete top slab.

[0008] Preferably, the left and right isolation nets have the same structure, with the left isolation net comprising a mesh cast integrally with the left basement reinforced concrete roof slab and a frame connected to the mesh at the side where it connects to the left supporting vertical steel plate. This further enhances the connection reliability between the roof post-cast strip and the basement reinforced concrete roof slab.

[0009] Preferably, the left isolation net and the right isolation net are both steel structures, which can improve the structural strength of the basement roof.

[0010] Preferably, the lateral telescopic mechanism is a hydraulic cylinder connected to a hydraulic station, which has a simple structure and is convenient for adjusting the prestress during telescopic operation.

[0011] 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, which can improve the connection reliability between the first cast part and the second cast part of the top plate post-casting strip.

[0012] Preferably, the isolation plate is a steel structure, which can improve the structural strength of the top plate post-cast zone.

[0013] Beneficial effects: prestressing can be applied before pouring the basement post-cast strip, thereby avoiding cracking of the basement top plate; cracking is not easy to occur between the basement basement basement and the basement post-cast strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a front view of the first embodiment of the present utility model when in use;

[0015] Figure 2It is a top view schematic diagram of the utility model in practical state;

[0016] Figure 3 This is a schematic diagram of the left support frame and the right support frame being connected;

[0017] Figure 4 This is a schematic diagram of the left basement reinforced concrete top slab and the right basement reinforced concrete top slab after pouring.

[0018] In the figure: left basement reinforced concrete top slab 1, right basement reinforced concrete top slab 2, top slab post-cast strip notch 3, connecting steel bars 4, transverse telescopic mechanism 7, hydraulic station 8, isolation plate 9, top slab post-cast strip first pouring space 10, left supporting vertical steel plate 11, right supporting vertical steel plate 12, top slab 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 slab 20, right basement reinforced concrete bottom slab 21, bottom slab post-cast strip notch 22, left support frame 23, right support frame 24, left basement reinforced concrete top slab steel skeleton 25, right basement reinforced concrete top slab steel skeleton 26, bottom slab 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

[0019] 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.

[0020] See also Figures 1 to 4A prestressed device for pouring a post-cast strip of a basement roof comprises a left basement reinforced concrete roof slab 1 and a right basement reinforced concrete roof slab 2. The left basement reinforced concrete roof slab and the right basement reinforced concrete roof slab are disconnected to form a post-cast strip gap 3. The left basement reinforced concrete roof slab and the right basement reinforced concrete roof slab are connected together by a plurality of connecting steel bars 4. The connecting steel bars are distributed along the length direction of the post-cast strip gap of the roof slab. The device also comprises a plurality of transverse telescopic mechanisms 7 and a plurality of isolation plate pairs. The transverse telescopic mechanism is a hydraulic cylinder, which is connected to a hydraulic station 8. The two isolation plates 9 of the isolation plate pair are distributed along the length direction of the post-cast strip gap of the roof slab. The two ends of the isolation plates of the isolation plate pair are respectively abutted against the left basement reinforced concrete roof slab and the right basement reinforced concrete roof slab. The transverse telescopic mechanism is located one-to-one between the two isolation plates in the isolation plate pair. The area of ​​the post-cast strip gap of the roof slab located outside the isolation plate pair forms a first pouring space 10 for the post-cast strip of the roof slab. One end of the transverse telescopic mechanism abuts the left basement reinforced concrete roof slab via the left supporting vertical steel plate 11, and the other end abuts the right basement reinforced concrete roof slab via the right supporting vertical steel plate 12. The upper ends of the left and right supporting vertical steel plates extend upward beyond the notch in the roof slab's post-casting strip, while the lower ends extend downward through the roof slab mold plate 13 and beyond the notch in the roof slab's post-casting strip. The lower ends of the left and right supporting vertical steel plates are connected by a threaded connecting rod 15. The connecting rod is equipped with a left stopper 16 abutting the left supporting vertical steel plate and a right stopper 17 abutting the right supporting vertical steel plate. Both the left and right stoppers are threadedly connected to the connecting rod. The transverse telescopic mechanism abuts the upper ends of the left and right supporting vertical steel plates. When removing the transverse telescopic mechanism, the left and right supporting vertical steel plates 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 slab post-cast strip formed by the left basement reinforced concrete top slab, and a right isolation net 19 located on the end surface of the side plate of the notch of the top slab post-cast strip formed by the right basement reinforced concrete top slab. 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 slab and a skeleton connected to the side where the mesh is 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 slab post-cast strip notch bosses are provided on both sides of the isolation plate along the length direction of the notch of the top slab post-cast strip. The isolation plate is a steel structure.

[0021] The method for pouring a basement by the utility model is as follows: the first step is to pour the basement bottom plate first: pour the left basement reinforced concrete bottom plate 20 and the right basement reinforced concrete bottom plate 21, and form a bottom plate post-casting strip notch 22 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 pouring template: build a left support frame 23 on the left basement reinforced concrete bottom plate, build a right support frame 24 on the right basement reinforced concrete bottom plate, and lay the top plate template body 13 on the left support frame and the right support frame; the third step is to pour the basement top plate first: on the top plate template 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 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 gap 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 into the bottom plate post-casting strip gap to form the bottom plate post-casting strip 27; the fifth step is to apply prestressing force: the left basement reinforced concrete top plate is driven by a plurality of transverse telescopic mechanisms. The reinforced concrete top plate of the lower room and the reinforced concrete top plate of the right basement are separated so that the reinforced concrete top plate of the left basement and the reinforced concrete top plate of the right basement are prestressed; the fifth step is to cast the top plate post-casting strip: an isolation plate is assembled on both sides of the length direction of the notch of the top plate post-casting 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 plate of the left basement and the reinforced concrete top plate of the right basement, and the isolation plate pair isolates a number of first casting spaces of the top plate post-casting strip in the notch of the top plate post-casting strip, and in the first casting space of the top plate post-casting 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 horizontal 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, thereby preventing the left basement reinforced concrete top slab and the right basement reinforced concrete top slab from cracking. The poured concrete in the second pouring space of the top slab post-casting strip is solidified 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 force and then casts the top slab post-casting strip, thereby preventing the left basement reinforced concrete top slab and the right basement reinforced concrete top slab from cracking. In the third step, a left isolation net is cast 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 cast 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, welded to the steel frame of the left basement reinforced concrete top slab. The right isolation net is a steel structure, welded to the steel frame of the right basement reinforced concrete top slab. One end of the transverse telescopic mechanism abuts against the left basement reinforced concrete top slab via the left supporting vertical steel plate, and the other end abuts against the right basement reinforced concrete top slab via the right supporting vertical steel plate. The upper ends of the left and right supporting vertical steel plates extend upward beyond the notch in the top slab post-casting strip, and the lower ends pass through the top slab formwork. The lower ends of the left and right supporting vertical steel plates are connected together via a connecting rod located below the top slab formwork. 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 and right supporting vertical steel plates. 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. 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 plate body, and then the top plate post-casting strip is cast. 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 top plate post-casting strip notch.

[0022] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0023] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A prestressed device for pouring a post-cast strip of a basement roof, comprising a left basement reinforced concrete roof and a right basement reinforced concrete roof, wherein the left basement reinforced concrete roof and the right basement reinforced concrete roof are disconnected to form a notch in the post-cast strip of the roof, and the left basement reinforced concrete roof and the right basement reinforced concrete roof are connected together by a plurality of connecting steel bars, and the connecting steel bars are distributed along the length direction of the notch in the post-cast strip of the roof, characterized in that: It includes several transverse telescopic mechanisms and several isolation plate pairs. The two isolation plates of the isolation plate pair are distributed along the length direction of the notch of the top plate post-cast strip. The two ends of the isolation plates of the isolation plate pair are respectively abutted against the left basement reinforced concrete top plate and the right basement reinforced concrete top plate. The transverse telescopic mechanisms are located one-to-one between the two isolation plates in the isolation plate pair. The notch of the top plate post-cast strip is located in the area outside the isolation plate pair to form the first pouring space of the top plate post-cast strip.

2. A prestressed device for pouring post-cast strips of basement roof according to claim 1, characterized in that: 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.

3. A prestressed device for pouring post-cast strips of basement roof according to claim 2, 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 plate post-casting strip, and the lower ends extend downward beyond the notch of the top plate post-casting strip. The lower ends of the left supporting vertical steel plate and the right supporting vertical steel plate are connected together by a connecting rod. 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 horizontal telescopic mechanism abuts against the upper ends of the left supporting vertical steel plate and the right supporting vertical steel plate.

4. A prestressed device for pouring post-cast strips of basement roof according to claim 1, 2 or 3, characterized in that: It also includes a left isolation net located on the end surface of the side plate of the notch of the top plate of the left basement reinforced concrete top plate and a right isolation net located on the end surface of the side plate of the notch of the top plate of the right basement reinforced concrete top plate.

5. A prestressed device for pouring post-cast strips of basement roof according to claim 4, characterized in that: 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 skeleton connected to the side where the mesh is connected to the left supporting vertical steel plate.

6. A prestressed device for pouring post-cast strips of basement roof according to claim 4, characterized in that: The left isolation net and the right isolation net are both steel structures.

7. A prestressed device for pouring post-cast strips of basement roof according to claim 1, 2 or 3, characterized in that: The transverse telescopic mechanism is a hydraulic cylinder, and the hydraulic cylinder is connected to the hydraulic station.

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

9. A prestressed device for pouring post-cast strips of basement roof according to claim 8, characterized in that: The isolation plate is a steel structure.

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