A passive cast-in-place concrete exterior wall formwork system and construction method thereof

Abstract

The present invention discloses a passive cast-in-situ concrete exterior wall formwork system and a construction method thereof, wherein the formwork system includes a first pair of plug-in screws, a second pair of plug-in screws, an inner screw, a first disassembly screw, and a second disassembly screw. The first pair of plug-in screws and the second pair of plug-in screws are coaxially arranged relative to each other and connected by threads, and are used to insert and fix an insulation board from both sides. The first pair of plug-in screws and the second pair of plug-in screws have hollow rod bodies and are collectively sleeved on the outside of the inner screw. The inner screw integrally passes through the first pair of plug-in screws and the second pair of plug-in screws, and conical caps are provided at both ends. The first disassembly screw and the second disassembly screw are respectively detachably connected to the conical caps. The present invention solves the problem that traditional tension bolts leave holes after use and cannot meet the airtightness requirements of passive house exterior walls. It not only ensures airtightness but also avoids the generation of cold and hot bridges, thereby improving the thermal insulation performance of the wall.

Description

Technical Field

[0001] The invention relates to the field of concrete exterior wall formwork support, and in particular to a passive cast-in-place concrete exterior wall formwork support system and a construction method thereof. Background Art

[0002] With the continuous development of my country's construction industry and the national trend of promoting energy conservation and emission reduction in buildings, the entire construction and real estate industry has entered a stage of aligning itself with passive houses. Passive buildings optimize the building envelope by adopting advanced energy-saving design concepts and construction techniques, greatly improving the building's thermal insulation, heat insulation, and airtightness. They also recycle heat (cold) from indoor exhaust air through efficient heat (cold) recovery devices in the fresh air system, significantly reducing the building's heating and cooling needs. Compared with traditional construction methods, they are more energy-efficient, power-saving, noise-reducing, and environmentally friendly. During the construction of passive buildings, exterior wall airtightness and heat bridge treatment are particularly important.

[0003] Traditional cast-in-place concrete exterior wall formwork is fixed with metal tie screws, and the holes of the tie screws need to be sealed later, which is not conducive to the airtightness of the passive house and it is difficult to ensure the airtightness requirements of the passive building exterior enclosure, which is the top priority of the passive house.

[0004] It can be seen that how to create a new passive cast-in-situ concrete exterior wall formwork system and its construction method is one of the important current research and development topics. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a passive cast-in-place concrete exterior wall formwork system, which can not only effectively fix the insulation board, but also ensure airtightness and avoid the generation of hot and cold bridge effects, meet the standards of passive buildings, and thus overcome the shortcomings of the existing technology.

[0006] In order to solve the above technical problems, the present invention provides a passive cast-in-place concrete exterior wall formwork system, including a first pair of plug-in screws, a second pair of plug-in screws, an inner screw, a first disassembly screw and a second disassembly screw. The first pair of plug-in screws and the second pair of plug-in screws are coaxially arranged relative to each other and are connected by threads for inserting and fixing the insulation board from both sides; the rod bodies of the first pair of plug-in screws and the second pair of plug-in screws are hollow and are jointly mounted on the outside of the inner screw. The inner screw passes through the first pair of plug-in screws and the second pair of plug-in screws as a whole, and conical caps are provided at both ends. The first disassembly screw and the second disassembly screw are respectively detachably connected to the conical caps.

[0007] As an improvement of the present invention, butterfly buckles are screwed into the first disassembly screw and the second disassembly screw for fixing the template between the butterfly buckle and the conical cap.

[0008] Furthermore, the first pair of plug-in screws and the second pair of plug-in screws have through holes along the axis, the holes are provided with internal threads, the outer circumference of the internal screws is provided with external threads, and the first pair of plug-in screws and the second pair of plug-in screws are both threadedly connected to the internal screws.

[0009] Furthermore, the first pair of plug-in screws, the second pair of plug-in screws and the inner screw are all made of non-metallic materials.

[0010] Furthermore, the tail ends of the first pair of inserting screws and the second pair of inserting screws are both provided with disc-shaped insulation board fixing caps.

[0011] Furthermore, mounting holes are opened at both ends of the conical cap, the small diameter end of the conical cap is threadedly connected to the inner screw, and the large diameter end of the conical cap is threadedly connected to the first disassembly screw or the second disassembly screw.

[0012] In addition, the present invention also provides a construction method, which eliminates the need to seal screw holes after casting and forming, thereby ensuring the air tightness of the exterior wall and simplifying the construction process, thereby overcoming the shortcomings of the existing technology.

[0013] In order to solve the above technical problems, the present invention provides a construction method, which adopts the above-mentioned passive cast-in-situ concrete exterior wall formwork system for construction, and the specific steps are as follows:

[0014] S1. First, erect the formwork and insulation boards on both sides, arrange the vertical and horizontal screws according to the designed construction plan, pre-assemble the formwork, draw lines, and drill holes;

[0015] S2. Prefabricate or pre-install the second pair of inserting screws and the inner screw into one piece, and insert them together from one side of the insulation board;

[0016] S3. Slide the first pair of screws onto the inner screws and gradually screw them in from the other side of the insulation board until they are firmly connected with the second pair of screws. The insulation board fixing caps at the tails of the first and second pair of screws are in close contact with the insulation board.

[0017] S4, connect the tapered cap to the end of the inner screw;

[0018] S5. Pass the first disassembly screw through one side of the template and screw it into the conical cap at the end of the inner screw, and secure the template by tightening the butterfly buckle;

[0019] S6. Pass the second disassembly screw through the other side template and screw it into the conical cap at the end of the inner screw, and fix the other side template by tightening the butterfly buckle;

[0020] S7. Repeat steps S2 to S6 until all screws on the insulation board and the templates on both sides are fixed.

[0021] After adopting such a design, the present invention has at least the following advantages:

[0022] 1. The first pair of screws and the second pair of screws are inserted into the insulation board from opposite sides and connected as a whole through threads to effectively fix the insulation board;

[0023] 2. The disc-shaped insulation board fixing caps at the tail ends of the first pair of screws and the second pair of screws are in close contact with the insulation board, sealing the gap between the through-holes and the first pair of screws and the second pair of screws to ensure airtightness;

[0024] 3. The outer periphery of the inner screw is provided with an external thread, which increases the contact surface with the concrete after the building concrete is formed, further ensuring the air tightness;

[0025] 4. The first pair of insert screws, the second pair of insert screws and the inner screws are not removed after pouring, which ensures the airtightness of the wall and reduces the process of plugging holes in the later stage;

[0026] 5. The first pair of screws, the second pair of screws, and the inner screw are all made of non-metallic materials. After pouring, they are wrapped inside the concrete and will not form cold or hot bridges.

[0027] 6. The first disassembly screw and the second disassembly screw can be disassembled and circulated and reused. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] Figure 1 It is a structural schematic diagram of a passive cast-in-situ concrete exterior wall formwork system provided by the present invention.

[0030] Figure 2 It is a schematic diagram of the three-dimensional structure of the first pair of plug-in screws and the second pair of plug-in screws.

[0031] Figure 3 It is a schematic diagram of the cross-sectional structure of the first pair of plug-in screws and the second pair of plug-in screws.

[0032] Figure 4 This is a schematic diagram of the installation status of a passive cast-in-situ concrete exterior wall formwork system provided by the present invention.

[0033] Explanation of the accompanying drawings: 1. First pair of insertion screws; 2. Second pair of insertion screws; 3. Internal screw; 4. First disassembly screw; 5. Second disassembly screw; 6. Insulation board fixing cap; 7. Conical cap; 8. Butterfly buckle; 9. Insulation board; 10. Concrete; 11. Formwork. DETAILED DESCRIPTION

[0034] See also Figures 1 to 4The present invention provides a passive cast-in-situ concrete exterior wall formwork system, including a first pair of inserting screws 1, a second pair of inserting screws 2, an inner screw 3, a first disassembly screw 4 and a second disassembly screw 5.

[0035] The first pair of insertion screws 1 and the second pair of insertion screws 2 are coaxially arranged relative to each other and connected by threads. The tail ends of the first pair of insertion screws 1 and the second pair of insertion screws 2 are provided with disc-shaped insulation board fixing caps 6. When in use, the first pair of insertion screws 1 and the second pair of insertion screws 2 are respectively inserted from both sides of the insulation board 9 and tightened and fixed. The insulation board fixing caps 6 are in close contact with the insulation board 9 to seal the gap between the through-hole and the first pair of insertion screws 1 and the second pair of insertion screws 2 to ensure the sealing of the wall.

[0036] The first and second pairs of screws 1 and 2 are hollow and internally threaded, while the outer periphery of the inner screw 3 is provided with external threads. The first and second pairs of screws 1 and 2 are fitted over the inner screw 3, so that the inner screw 3 extends entirely through the first and second pairs of screws 1 and 2. This design not only allows the inner screw 3 to be threadedly connected to the first and second pairs of screws 1 and 2, effectively reducing and blocking the cold and hot bridge effect; it also increases the outer threads of the inner screw 3 after concrete 10 is poured, further improving the sealing of the wall.

[0037] Both ends of the inner screw 3 are provided with a conical cap 7, and both ends of the conical cap 7 are provided with a mounting hole, and the hole is provided with an internal thread. The small diameter end is threadedly connected to the inner screw 3, and the large diameter end is threadedly connected to the first disassembly screw 4 or the second disassembly screw 5. A butterfly buckle 8 is screwed into the first disassembly screw 4 and the second disassembly screw 5. When in use, the template 11 can be pressed and fixed between the conical cap 7 and the butterfly buckle 8 by tightening the butterfly buckle 8. After casting and forming, the butterfly buckle 8 is removed to dismantle the template 11, and the first disassembly screw 4 and the second disassembly screw 5 can be removed for rotation. The inner screw 3, the first pair of plug-in screws 1 and the second pair of plug-in screws 2 are permanently retained in the wall and will not be removed, leaving no holes, and no need for repair at a later time.

[0038] Preferably, the first pair of inserting screws 1, the second pair of inserting screws 2 and the inner screw 3 are all made of non-metallic materials to avoid forming cold and hot bridges in the wall and destroying the thermal insulation performance of the wall.

[0039] In addition, the present invention also provides a construction method, which uses a passive cast-in-place concrete exterior wall formwork system provided by the present invention for construction, and the specific steps are:

[0040] S1. First, erect the templates 11 on both sides and the insulation board 9, arrange the vertical and horizontal screws according to the designed construction plan, pre-assemble the templates, draw lines, and drill holes.

[0041] S2. Prefabricate or pre-install the second pair of inserting screws 2 and the inner screw 3 as one piece, and insert them together from one side of the insulation board 9;

[0042] S3. Slide the first pair of screws 1 onto the inner screw 3 and gradually screw them in from the other side of the insulation board 9 until they are firmly threaded together with the second pair of screws 2. The insulation board fixing caps 6 at the tails of the first pair of screws 1 and the second pair of screws 2 are in close contact with the insulation board 9.

[0043] S4, connecting the conical cap 7 to the end of the internal screw 3;

[0044] It should be noted that, in some embodiments, in order to simplify the on-site construction process, the inner screw 3 and the second disassembly screw 2 are prefabricated as one piece during the factory manufacturing stage. At the same time, the conical cap 7 on one side of the second disassembly screw 2 is also prefabricated together with the inner screw 3. On site, only the first pair of insertion screws 1 and the conical cap 7 on the same side as the first pair of insertion screws 1 need to be installed.

[0045] S5. Pass the first disassembly screw 5 through one side template 11 and screw it into the conical cap 7 at the end of the inner screw 3, and fix the template 11 by tightening the butterfly buckle 8;

[0046] S6. Pass the second disassembly screw 6 through the other side template 11 and screw it into the conical cap 7 at the end of the inner screw 3, and fix the other side template 11 by tightening the butterfly buckle 8;

[0047] S7. Repeat steps S2 to S6 until all screws on the insulation board 9 and the templates 11 on both sides are fixed.

[0048] The present invention provides a passive cast-in-place concrete exterior wall formwork system and construction method, which solves the problem that traditional tension bolts leave holes after use and cannot meet the airtightness requirements of passive house exterior walls. It not only ensures airtightness but also avoids the generation of cold and hot bridges, thereby improving the thermal insulation performance of the wall.

[0049] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Those skilled in the art can make some simple modifications, equivalent changes or modifications based on the technical content disclosed above, which all fall within the scope of protection of the present invention.

Claims

1. A passive cast-in-situ concrete exterior wall formwork system, characterized in that: The first and second pairs of plug-in screws are coaxially arranged relative to each other and are connected by threads, and are used to insert and fix the insulation board from both sides; the first and second pairs of plug-in screws have hollow shafts and are jointly sleeved on the outside of the inner screw; the inner screw integrally passes through the first and second pairs of plug-in screws, and conical caps are provided at both ends, and the first and second disassembly screws are detachably connected to the conical caps respectively; The first pair of plug screws and the second pair of plug screws are provided with through holes along the axis, the holes are provided with internal threads, the outer periphery of the internal screws is provided with external threads, and the first pair of plug screws and the second pair of plug screws are both threadedly connected to the internal screws; The first pair of plug-in screws, the second pair of plug-in screws and the inner screw are all made of non-metallic materials.

2. A passive cast-in-situ concrete exterior wall formwork system according to claim 1, characterized in that: The first disassembly screw and the second disassembly screw are screwed with butterfly buckles for fixing the template between the butterfly buckles and the conical cap.

3. A passive cast-in-situ concrete exterior wall formwork system according to claim 1, characterized in that: The tail ends of the first pair of inserting screws and the second pair of inserting screws are both provided with disc-shaped insulation board fixing caps.

4. A passive cast-in-situ concrete exterior wall formwork system according to claim 1, characterized in that: Mounting holes are formed at both ends of the conical cap. The small diameter end of the conical cap is threadedly connected to the inner screw, and the large diameter end of the conical cap is threadedly connected to the first disassembly screw or the second disassembly screw.

5. A construction method, characterized in that: The passive cast-in-situ concrete exterior wall formwork system according to any one of claims 1 to 4 is used for construction, and the specific steps are as follows: S1. First, erect the formwork and insulation boards on both sides, arrange the vertical and horizontal screws according to the designed construction plan, pre-assemble the formwork, draw lines, and drill holes; S2. Prefabricate or pre-install the second pair of inserting screws and the inner screw into one piece, and insert them together from one side of the insulation board; S3. Slide the first pair of screws onto the inner screws and gradually screw them in from the other side of the insulation board until they are firmly connected with the second pair of screws. The insulation board fixing caps at the tails of the first and second pair of screws are in close contact with the insulation board. S4, connect the tapered cap to the end of the inner screw; S5. Pass the first disassembly screw through one side of the template and screw it into the conical cap at the end of the inner screw, and secure the template by tightening the butterfly buckle; S6. Pass the second disassembly screw through the other side template and screw it into the conical cap at the end of the inner screw, and fix the other side template by tightening the butterfly buckle; S7. Repeat steps S2 to S6 until all screws on the insulation board and the templates on both sides are fixed.

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