Top plate post-cast strip bottom die quick-release supporting system and chiseling construction method

Abstract

The invention relates to a top plate post-cast strip bottom die quick-release supporting system and a chiseling construction method.The bottom die quick-release supporting system comprises a post-cast strip supporting frame, a plurality of jacking supports are installed at the top of the post-cast strip supporting frame, and a plurality of transverse main keels and a plurality of longitudinal auxiliary keels are sequentially installed at the tops of the jacking supports; a post-cast strip formwork is installed on the tops of the multiple secondary keels, a bottom formwork of the post-cast strip formwork comprises three wood formworks and two PVC plates used for connecting the three wood formworks, the two PVC plates are located below the position needing to be scabbled, during scabbling, only the two PVC plates need to be detached, and the construction period is greatly shortened. The secondary keel used for supporting the two PVC plates comprises the two rectangular pipes and the connecting square steel, the two rectangular pipes are arranged at the two ends of the connecting square steel in a sleeving mode for connection, in this way, the secondary keel can be divided into the two rectangular pipes, the rectangular pipes are relatively short and convenient to take out and install, the labor intensity of constructors is reduced, and the construction efficiency is improved. And meanwhile, the dismounting and remounting efficiency of the post-cast strip formwork is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of building construction, and particularly relates to a roof post-pouring belt bottom die quick disassembly support system. BACKGROUND

[0002] The post-pouring belt is a concrete belt with a certain width and poured after a certain time, which is reserved in a structure such as a beam, a plate (including a foundation bottom plate), a wall, and the like, to adapt to environmental temperature changes, concrete shrinkage, and uneven settlement of the structure and the like. In the construction of the roof post-pouring belt, the post-pouring belt and the main body structures on both sides adopt independent support systems. When the main body structures on both sides are completed, the surfaces of the poured concrete (i.e., the edge of the main body structure) on both sides of the post-pouring belt need to be chiseled before the post-pouring belt concrete is poured. Chiseling can destroy the smooth layer on the surface of the concrete, so that the surface becomes rough, thereby providing a better bonding surface for the newly poured concrete.

[0003] Before chiseling, the post-pouring belt bottom die needs to be completely disassembled before the concrete can be chiseled. After chiseling is completed, the bottom die needs to be reassembled. The construction period is long. When the bottom die is disassembled, the secondary keel at the bottom needs to be removed first. Since the secondary keel is usually long (about 2-3 meters), the secondary keel is difficult to remove and install, the labor intensity of the construction personnel is large, and the disassembly and reinstallation efficiency of the post-pouring belt die is low. SUMMARY

[0004] The main purpose of the application is to provide a roof post-pouring belt bottom die quick disassembly support system, which can effectively solve the problems in the background art.

[0005] To achieve the above purpose, the application is implemented by the following technical scheme:

[0006] A roof post-pouring belt bottom die quick disassembly support system, comprising a post-pouring belt support frame, a plurality of top supports are installed on the top of the post-pouring belt support frame, a plurality of horizontal main keels and a plurality of vertical secondary keels are installed on the top of the plurality of top supports in sequence, a post-pouring belt die is installed on the top of the plurality of secondary keels, the bottom die of the post-pouring belt die comprises three wooden dies and two PVC plates used for connecting the three wooden dies, the two PVC plates are located below the positions needing to be chiseled, wherein the secondary keel used for supporting the two PVC plates comprises two rectangular tubes and a connecting square steel, the two rectangular tubes are sleeved on both ends of the connecting square steel for connection.

[0007] Preferably, a rectangular frame is fixedly sleeved on the outer side of the middle part of the connecting square steel.

[0008] Preferably, the two ends of the connecting square steel are provided with through first connecting holes, the two ends of the rectangular tube are provided with through second connecting holes, the two rectangular tubes are sleeved on the two ends of the connecting square steel, and the first connecting holes are aligned with the second connecting holes and are fixedly connected through bolts.

[0009] Preferably, the upper edges of the two rectangular tubes extend outward.

[0010] A post-pouring strip concrete chiseling construction method, comprising the following steps:

[0011] Step 1: first, erect a post-pouring strip side structure frame and a post-pouring strip support frame;

[0012] Step 2: install a plurality of top supports on the top of the post-pouring strip side structure frame and the post-pouring strip support frame, for adjusting the template elevation;

[0013] Step 3: install a plurality of horizontal main furring strips and a plurality of vertical secondary furring strips on the top of the plurality of top supports in sequence, install a post-pouring strip template and a main body structure template on the top of the plurality of secondary furring strips, the bottom die of the post-pouring strip template comprises three wooden templates and two PVC plates for connecting the three wooden templates, the two PVC plates are located below the positions requiring chiseling, wherein the secondary furring strips for supporting the two PVC plates comprise two rectangular tubes and a connecting square steel, the two rectangular tubes are sleeved on the two ends of the connecting square steel for connection;

[0014] Step 4: pour the main body structure concrete on both sides, after the main body structure concrete on both sides reaches the strength, remove the template and the structure support frame at the bottom of the template, and retain the post-pouring strip template and the post-pouring strip support frame;

[0015] Step 5: chisel in stages: in the first stage, process the upper concrete of the water stop steel plate by using an electric chiseling machine, in the second stage, take out the two rectangular tubes from both sides, then take out the connecting square steel, and finely chisel the lower concrete in sequence after removing the two PVC plates;

[0016] Step 6: interface treatment: flush the joint line by using a high-pressure water gun and then brush a cement-based interface agent;

[0017] Step 7: template recovery: re-install the PVC plates and the corresponding secondary furring strips, after the joint gap between the PVC plates and the wooden templates is less than or equal to 1 mm, pour micro-expansion concrete to form a post-pouring strip.

[0018] The application provides a roof post-pouring strip bottom die quick-release support system, and has the following beneficial effects:

[0019] The bottom die of the post-cast strip template comprises three wooden templates and two PVC plates used for connecting the three wooden templates, and the two PVC plates are located below the position requiring chiseling, and when chiseling is performed, only the two PVC plates need to be removed, thereby greatly shortening the construction period, wherein the secondary keel used for supporting the two PVC plates comprises two rectangular tubes and a connecting square steel, the two rectangular tubes are sleeved on both ends of the connecting square steel for connection, so that the secondary keel can be divided into two rectangular tubes, the length of the rectangular tube is relatively short, the rectangular tube is convenient to take out and install, the labor intensity of the construction personnel is reduced, and meanwhile the dismounting and reinstallation efficiency of the post-cast strip template is improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a structural schematic view of the post-cast strip bottom die quick dismounting support system of the application;

[0021] Figure 2 It is a partial enlarged view of the application Figure 1 ;

[0022] Figure 3 It is a structural schematic view of the secondary keel used for supporting the PVC plate of the application;

[0023] Figure 4 It is a connection schematic view of the PVC plate and the secondary keel of the application.

[0024] In the figure: 1, post-cast strip support frame; 2, top support; 3, main keel; 4, secondary keel; 5, post-cast strip template; 51, wooden template; 52, PVC plate; 41, rectangular tube; 411, second connecting hole; 42, connecting square steel; 421, first connecting hole; 43, rectangular frame; 44, bolt; 5, main structure concrete; 6, water stop steel plate. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the application clearer, the technical scheme in the application will be clearly and completely described below in combination with the drawings of the application. Obviously, the described embodiments are part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the application.

[0026] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0028] Reference Figures 1-4 A quick-release support system for the bottom formwork of a top slab post-cast strip includes a post-cast strip support frame 1. Several top supports 2 are installed on the top of the post-cast strip support frame 1. Several horizontal main keels 3 and several vertical secondary keels 4 are sequentially installed on the top of the top supports 2. A post-cast strip template 5 is installed on the top of the secondary keels 4. The bottom formwork of the post-cast strip template 5 includes three wooden templates 51 and two PVC boards 52 for connecting the three wooden templates 51. The two PVC boards 52 are located below the area requiring roughening. The secondary keels 4 for supporting the two PVC boards 52 include two rectangular tubes 41 and a connecting square steel 42. The two rectangular tubes 41 are sleeved at both ends of the connecting square steel 42 for connection.

[0029] As a preferred embodiment, a rectangular frame 43 is fixedly sleeved on the outer side of the middle part of the connecting square steel 42 to prevent the connecting square steel 42 from entering a rectangular tube 41 as a whole, and to ensure that both ends of the connecting square steel 42 can be connected to the rectangular tube 41.

[0030] As a preferred embodiment, both ends of the connecting square steel 42 are provided with through first connecting holes 421, and both ends of the rectangular tube 41 are provided with through second connecting holes 411. The two rectangular tubes 41 are sleeved on both ends of the connecting square steel 42, and the first connecting holes 421 and the second connecting holes 411 are aligned and fixedly connected by bolts 44, so as to improve the connection strength of the two rectangular tubes 41 when necessary.

[0031] As a preferred embodiment, the upper sides of the two rectangular tubes 41 extend outward to provide a larger support area.

[0032] The present invention also provides a method for chiseling concrete in post-cast strips, comprising the following steps:

[0033] Step 1: First, erect the structural frames on both sides of the post-pouring strip (not shown) and the post-pouring strip support frame 1. Since the post-pouring strip has a long retention time, the formwork and support frame for this part are set up independently.

[0034] The structural frames on both sides of the post-cast strip and the post-cast strip support frame 1 are connected by several vertical and horizontal bars. When installing the vertical bars, install Φ48mm vertical bars according to the marked positions, with adjustable bases at the bottom. The height adjustment error is ≤3mm. Verticality correction is checked using a laser level, with a deviation ≤H / 500 (H is the floor height). When installing the horizontal bars, the horizontal bar spacing is ≤1.8m, and they are fixed with cross-shaped fasteners. The tightening torque at the joints is ≥40N·m. Scissor braces (45° angle) are added every 6m and connected to the vertical bars with swivel fasteners.

[0035] Step 2: Install several top supports 2 on the top of the structural frames on both sides and the post-pouring strip support frame 1 to adjust the formwork elevation;

[0036] The top support 2 is U-shaped. After installation, it should be leveled and calibrated with a spirit level. The height difference between the top surfaces should be ≤2mm.

[0037] Step 3: Install several horizontal main keels 3 and several vertical secondary keels 4 sequentially on the top of the several top supports 2. Install the main structure templates on both sides and the post-pouring strip template 5 in the middle on the top of the several secondary keels 4. The bottom mold of the post-pouring strip template 5 includes three wooden templates 51 and two PVC boards 52 for connecting the three wooden templates 51. The two PVC boards 52 are located below the area that needs to be roughened. The secondary keel 4 for supporting the two PVC boards 52 includes two rectangular tubes 41 and a connecting square steel 42. The two rectangular tubes 41 are sleeved on both ends of the connecting square steel 42 for connection.

[0038] Specifically, the main keel 3 uses double steel pipes with a spacing of ≤800mm, which are in close contact with the top support 2. The PVC board 52 is 200mm wide and is assembled with the wooden template 51. The joints are covered with 3mm thick double-sided adhesive strips. After compression, there are no visible gaps. The flatness of the template surface is ≤2mm / 2m (tested with a 2m straightedge).

[0039] Step 4: Pour the main structural concrete 6 on both sides. After the main structural concrete 6 on both sides reaches the required strength, remove the formwork and the structural support frame at the bottom, and retain the formwork 5 for the post-pouring strip and the support frame 1 for the post-pouring strip.

[0040] Step 5: Chisel in stages: In the first stage, use an electric chisel to treat the concrete above the waterstop steel plate 7. In the second stage, remove two rectangular tubes 41 from both sides, then remove the connecting square steel 42, and remove the two PVC plates 52 in sequence before finely chiseling the lower concrete.

[0041] Specifically, in the first stage, an electric chisel is used to chisel along the joint line to a depth of 20-30mm, with a chiseling surface unevenness of ≥5mm. After chiseling, the surface is immediately covered with a dust cover to prevent debris from falling into the lower part. In the second stage, a handheld breaker is used for fine operation, controlling the single chiseling depth to ≤10mm. A 20mm protective layer is reserved around the waterstop steel plate 7 to avoid mechanical damage.

[0042] Step 6: Interface Treatment: After rinsing the joint with a high-pressure water gun (8-10MPa), apply a cement-based interface agent (0.3kg / m²). 2 );

[0043] Step 7: Template restoration: Reinstall PVC board 52 and corresponding secondary keel 4. After verifying that the joint between PVC board 52 and wooden template 51 is ≤1mm, pour micro-expansion concrete to form a post-pouring strip.

[0044] The bottom formwork of the post-pouring strip template 5 of the present invention includes three wooden templates 51 and two PVC boards 52 for connecting the three wooden templates 51. The two PVC boards 52 are located below the area that needs to be roughened. When roughening, only the two PVC boards 52 need to be removed, which greatly shortens the construction period. The secondary keel 4 for supporting the two PVC boards 52 includes two rectangular tubes 41 and a connecting square steel 42. The two rectangular tubes 41 are sleeved on both ends of the connecting square steel 42 for connection. In this way, the secondary keel 4 can be divided into two rectangular tubes 41. The length of the rectangular tubes 41 is relatively short, which makes it easy to remove and install, reduces the labor intensity of construction workers, and improves the efficiency of dismantling and reinstalling the post-pouring strip template 5.

[0045] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A quick-release support system for the bottom formwork of a post-cast strip in a top slab, characterized in that: The system includes a post-cast strip support frame, on the top of which are mounted several top supports. Several horizontal main keels and several vertical secondary keels are sequentially mounted on the top of the top supports. A post-cast strip template is mounted on the top of the secondary keels. The bottom mold of the post-cast strip template includes three wooden templates and two PVC boards for connecting the three wooden templates. The two PVC boards are located below the area requiring roughening. The secondary keels supporting the two PVC boards include two rectangular tubes and a connecting square steel. The two rectangular tubes are sleeved at both ends of the connecting square steel and connected.

2. The quick-release support system for the bottom formwork of the post-cast strip of the top slab according to claim 1, characterized in that: A rectangular frame is fixedly fitted on the outer side of the middle part of the connecting square steel.

3. The quick-release support system for the bottom formwork of the post-cast strip of the top slab according to claim 1, characterized in that: Both ends of the connecting square steel are provided with a through first connecting hole, and both ends of the rectangular tube are provided with a through second connecting hole. The two rectangular tubes are sleeved on both ends of the connecting square steel, and the first connecting hole and the second connecting hole are aligned and fixedly connected by bolts.

4. The quick-release support system for the bottom formwork of the post-cast strip of the top slab according to claim 1, characterized in that: The upper sides of the two rectangular tubes extend outwards.

5. A method for chiseling concrete in post-cast strips, characterized in that, Includes the following steps: Step 1: First, erect the structural frames on both sides of the post-pouring strip and the support frame for the post-pouring strip; Step 2: Install several top supports on the top of the structural frames on both sides and the post-pouring strip support frame to adjust the formwork elevation; Step 3: Install several horizontal main keels and several vertical secondary keels sequentially on the top of the several top supports. Install the main structure templates on both sides and the post-pouring strip template in the middle on the top of the several secondary keels. The bottom mold of the post-pouring strip template includes three wooden templates and two PVC boards for connecting the three wooden templates. The two PVC boards are located below the area that needs to be roughened. The secondary keel for supporting the two PVC boards includes two rectangular tubes and a connecting square steel. The two rectangular tubes are sleeved on both ends of the connecting square steel and connected. Step 4: Pour the main structural concrete on both sides. After the main structural concrete on both sides reaches the required strength, remove the formwork and the structural support frame at the bottom, and retain the formwork and support frame of the post-pouring strip. Step 5: Chisel in stages: In the first stage, use an electric chisel to treat the concrete above the waterstop steel plate. In the second stage, remove two rectangular tubes from both sides, then remove the connecting square steel, remove the two PVC boards in sequence, and then carefully chisel the lower concrete. Step 6: Interface treatment: After rinsing the joint with a high-pressure water gun, apply a cement-based interface agent. Step 7: Template restoration: Reinstall PVC boards and corresponding secondary joists. After verifying that the joint between the PVC boards and the wooden template is ≤1mm, pour micro-expansion concrete to form a post-pouring strip.

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