A joint anti-cracking treatment structure and treatment method for assembled exterior wall prefabricated panels

Abstract

The present invention belongs to the field of prefabricated buildings, and specifically relates to a joint anti-cracking treatment structure for prefabricated exterior wall panels, comprising prefabricated panels, with a panel joint left between two prefabricated panels, wherein PE foam strips, structural adhesive, stainless steel elastic folding nets and high-ductility polymer mortar are arranged in sequence from the inside to the outside of the panel joints; the stainless steel elastic folding nets are folded in a wave shape, and the inner and outer ends of the stainless steel elastic folding nets are respectively embedded in the structural adhesive and the high-ductility polymer mortar; the outer end cover of the panel joint is provided with a JS flexible transition layer; a mesh cloth reinforcement layer is embedded in the JS flexible transition layer; a decorative surface layer is bonded to the surface of the JS flexible transition layer; the present invention also proposes a joint anti-cracking treatment method for prefabricated exterior wall panels; the present invention arranges a stainless steel elastic folding net with structural adhesive and high-ductility polymer mortar embedded in both ends respectively, so that the decorative surface layer of the present invention can be kept intact during long-term use, thereby reducing the later maintenance cost.

Description

Technical Field

[0001] The invention belongs to the technical field of assembled buildings, and in particular relates to a joint anti-cracking treatment structure of an assembled exterior wall prefabricated panel. Background Art

[0002] The exterior walls of prefabricated buildings are mostly composed of prefabricated components, with many joints. The conventional treatment of the joints of prefabricated vertical components is polyethylene rod + weather-resistant sealant, and the exterior wall facade is covered with decorative mortar or real stone paint. However, weather-resistant sealant has thermal expansion and contraction properties, which will cause the real stone paint or decorative mortar to be hollowed out or cracked in the long term. The exterior facade needs to be repaired on a large scale, the wall repair cost is high, and the repair process is complicated. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a joint anti-cracking treatment structure for assembled exterior wall prefabricated panels, which has little quality risk and will not cause deformation of the decorative surface due to deformation of the panel joint structure, thereby reducing subsequent maintenance costs.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] A joint anti-cracking treatment structure for assembled exterior wall prefabricated panels comprises prefabricated panels, a panel joint is left between two prefabricated panels, PE foam strips, structural adhesive, stainless steel elastic folding net and high-ductility polymer mortar are arranged in sequence from the inside to the outside of the panel joint; the stainless steel elastic folding net is folded in a wave shape and expands and contracts along the width direction of the panel joint, and the inner and outer ends of the stainless steel elastic folding net are respectively embedded in the structural adhesive and the high-ductility polymer mortar; the outer end cover of the panel joint is provided with a JS flexible transition layer; a mesh cloth reinforcement layer is embedded in the JS flexible transition layer; and a decorative surface layer is bonded to the surface of the JS flexible transition layer.

[0006] Furthermore, the stainless steel elastic folding net includes 5-12 folding surfaces, and the telescopic range of the stainless steel elastic folding net is 20mm-60mm.

[0007] Furthermore, the length of the folding surface along the depth direction of the plate hole is 30mm-50mm.

[0008] Furthermore, the wire diameter of the stainless steel elastic folded mesh ranges from 0.3mm to 1.0mm, and the mesh aperture ranges from 8mm to 20mm.

[0009] Furthermore, the overall length of the stainless steel elastic folded net is 600mm-1200mm.

[0010] Furthermore, the structural adhesive has a gluing depth of 30mm-50mm.

[0011] Furthermore, the stainless steel elastic folded mesh is embedded in the structural adhesive by 15mm-25mm.

[0012] Furthermore, the thickness of the JS flexible transition layer is 5mm-10mm.

[0013] Furthermore, both ends of the JS flexible transition layer extend beyond the plate seam by 80 mm to 120 mm.

[0014] The present invention also proposes a method for preventing cracks in the joints of assembled exterior wall prefabricated panels, comprising the following steps: ① cleaning the joints of the prefabricated panels and filling them with PE foam strips; ② filling the joints with structural adhesive; ③ compressing the stainless steel elastic folding net into the joints and embedding it into the structural adhesive; ④ filling with high-ductility polymer mortar, compacting it and smoothing the surface; ⑤ applying a JS flexible transition layer on the surface of the reserved step-back platform, and embedding a mesh cloth reinforcement layer inside the JS flexible transition layer.

[0015] The beneficial effects of the present invention are:

[0016] The present invention solves the quality problem that the existing joint structure is prone to cracking and bulging of the decorative surface at the joint. Compared with the traditional joint structure, the present invention embeds a stainless steel elastic folded mesh, a high-ductility polymer mortar and a JS flexible transition layer on the surface of the structural adhesive. After the precast concrete component shrinks and deforms due to the temperature difference structure, the stainless steel elastic folded mesh is set, with one end embedded in the structural adhesive and the other end embedded in the high-ductility polymer mortar, so that stratification with the high-ductility polymer mortar will not be caused;

[0017] Moreover, the high-ductility polymer mortar has excellent compatibility with the JS flexible transition layer. The JS flexible transition layer has a high plastic deformation ability and can convert the deformation of the plate seam in the width direction into the thickness change of the JS flexible transition layer. Since the deformation of the plate seam in the width direction is small, it is basically within 2 mm after research and test detection. Therefore, the deformation of the JS flexible transition layer when converted into thickness change is very small and can be ignored. Therefore, when the JS flexible transition layer is bonded to the decorative surface layer, the deformation of the decorative surface layer will not be caused by the deformation of the plate seam structure, so that the decorative surface layer of the present invention remains intact during long-term use, which helps to reduce the later maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. Among them:

[0019] Figure 1 It is a structural schematic diagram of the joint anti-cracking treatment structure of the assembled exterior wall prefabricated panel of the present invention.

[0020] Figure 2Schematic diagram of the unfolding of the stainless steel elastic folding net according to an embodiment of the present invention.

[0021] Figure 3 Schematic diagram of the structure of the stainless steel elastic folding net according to an embodiment of the present invention.

[0022] Figure 4 This is a whole picture of the experimental block of the present invention.

[0023] Figure 5 This is a photograph of the plate seam of the test block of the present invention.

[0024] Figure 6 A photograph of a stainless steel elastic folded mesh of a test block of the present invention.

[0025] In the figure, 1-PE foam strip, 2-structural adhesive, 3-stainless steel elastic folding mesh, 4-high ductility polymer mortar, 5-JS flexible transition layer, 6-mesh cloth reinforcement layer, 7-decorative surface layer. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention are described clearly and completely below. 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 belong to the scope of protection of the present invention.

[0027] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0028] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0029] like Figure 1 , Figure 4As shown, a joint anti-cracking treatment structure of an assembled exterior wall prefabricated panel comprises a prefabricated panel, a panel seam is left between two prefabricated panels, and a PE foam strip 1, a structural adhesive 2 (formed by solidification of the structural adhesive), a stainless steel elastic folding net 3 and a high-ductility polymer mortar 4 (formed by filling and solidifying the high-ductility polymer mortar) are sequentially arranged in the panel seam from the inside to the outside; the stainless steel elastic folding net 3 is folded in a wave shape and expands and contracts along the width direction of the panel seam, and the inner and outer ends of the stainless steel elastic folding net 3 are respectively embedded in the structural adhesive 2 and the high-ductility polymer mortar 4; the outer end cover of the panel seam is provided with a JS flexible transition layer 5; a mesh cloth reinforcement layer 6 is embedded in the JS flexible transition layer 5, and the mesh cloth reinforcement layer 6 adopts a glass fiber mesh cloth to improve the overall strength of the JS flexible transition layer 5; a decorative surface layer 7 is bonded to the surface of the JS flexible transition layer 5, such as the decorative surface layer 7 can be bonded with cement mortar; the structural adhesive 2 adopts a silicone structural adhesive 2;

[0030] The present invention is provided with a stainless steel elastic folding net 3, one end of which is embedded with the structural adhesive 2, and the other end of which is embedded with the high-ductility polymer mortar 4. Therefore, the thermal expansion and contraction of the structural adhesive 2 will not cause stratification with the high-ductility polymer mortar 4, and good bonding and waterproofing effects are always maintained; and the high-ductility polymer mortar 4 has excellent compatibility with the JS flexible transition layer 5, the JS flexible transition layer 5 is waterproof, and the JS waterproof material has a very high plastic deformation ability, which can convert the axial deformation of the plate seam into a radial thickness change of the JS flexible transition layer 5. The deformation of the plate seam is basically within 2 mm, and the deformation amount is very small when converted into a thickness change of the JS flexible transition layer 5, so it will not affect the decorative surface layer 7.

[0031] Further, such as Figures 1 to 3 As shown, the raw material of the stainless steel elastic folding mesh 3 is a stainless steel welded wire mesh, and the stainless steel elastic folding mesh 3 is prepared by folding the stainless steel welded wire mesh in an accordion style; the stainless steel elastic folding mesh 3 includes 5-12 folding surfaces, and the width of the folding surface is 20mm-30mm; the wire diameter range of the stainless steel elastic folding mesh 3 is 0.3mm-1.0mm, and the mesh aperture range is 8mm-20mm. The appropriate mesh aperture is convenient for the stainless steel elastic folding mesh 3 to be inserted into the structural adhesive 2, so that part of the structural adhesive 2 is squeezed into the other side of the stainless steel elastic folding mesh 3, which is beneficial for the subsequent high-ductility polymer mortar 4 to be filled and then merged with the boundary of the structural adhesive 2, and tightly combined with the stainless steel elastic folding mesh 3, and not easy to crack; the telescopic range of the stainless steel elastic folding mesh 3 is 20mm-60mm; the stainless steel elastic folding mesh 3 can also be made of other metal elastic meshes, such as copper wire mesh, but considering the cost and durability, stainless steel is generally used.

[0032] Furthermore, the overall length of the stainless steel elastic folded net 3 is 600mm-1200mm.

[0033] Furthermore, the gluing depth of the structural adhesive 2 is 30mm-50mm; the stainless steel elastic folded mesh 3 is embedded in the structural adhesive 2 by 15mm-25mm, and about half of the stainless steel elastic folded mesh 3 is embedded in the structural adhesive 2, so that the stainless steel elastic folded mesh 3 is fully integrated in the structural adhesive 2.

[0034] Furthermore, the JS flexible transition layer 5 is made of JS waterproof material, and JS waterproof coating is the abbreviation of polymer cement waterproof coating; the thickness of the JS flexible transition layer 5 is 5mm-10mm, and both ends of the JS flexible transition layer 5 extend beyond the board seam by 80mm-120mm, providing sufficient deformation volume of the JS flexible transition layer 5, so that the changes in the JS flexible transition layer 5 caused by the width of the board seam will not cause changes in the outer surface of the JS flexible transition layer 5, and thus the changes in the board seam will not cause the decorative surface layer 7 installed on the outer surface of the JS flexible transition layer 5 to become hollow or cracked.

[0035] like Figure 1 As shown, in a specific example, the plate seam depth is about 90mm, the width is 30mm, the structural adhesive 2 is 40mm deep, the high ductility polymer mortar 4 is 20mm deep, the JS flexible transition layer 5 is 8mm thick, and the total length is 230mm, in which a layer of mesh cloth reinforcement layer 6 is embedded; the stainless steel elastic folding net 3 has 5 folding surfaces.

[0036] Figure 4 For the test block manufactured according to the present invention, in order to show the structure of each layer, such as Figures 4 to 6 As shown in the figure, after the test block is made, the layer structure of the joint anti-cracking treatment structure is planed away layer by layer from the outside to the inside to reveal the structure of each layer. It can be clearly seen from the figure that the two ends of the stainless steel elastic folding net 3 are respectively embedded in the structural adhesive 2 and the high ductility polymer mortar 4; Figure 4 The stainless steel elastic folding net 3 has 10 folding surfaces.

[0037] The present invention also proposes a method for preventing cracks in the joints of assembled exterior wall prefabricated panels, comprising the following steps: ① cleaning the joints of the prefabricated panels and filling them with PE foam strips 1; ② filling the joints with structural adhesive 2, with a gluing depth of 30mm-50mm; ③ compressing the stainless steel elastic folding mesh 3 and inserting it into the joints and embedding it into the structural adhesive 2 by 15mm-25mm; ④ filling with high-ductility polymer mortar 4, compacting it and smoothing the surface; ⑤ applying a JS flexible transition layer 5 on the surface of the reserved step-back platform, and embedding a mesh cloth reinforcement layer 6 in the JS flexible transition layer 5; ⑥ bonding a decorative surface layer 7 on the surface of the JS flexible transition layer 5.

[0038] The processing method of the present invention has simple steps, is convenient and reliable, and the prepared joint anti-cracking treatment structure is resistant to deformation and has good waterproof effect. The decorative surface layer can be kept intact during long-term use, thereby reducing the subsequent maintenance cost.

[0039] It is to be understood that the above description is only exemplary and the embodiments of the present application do not limit this. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are within the scope of protection of the pending claims of the present invention.

Claims

1. A joint crack prevention treatment structure of assembled exterior wall prefabricated panels, comprising prefabricated panels, with a panel seam between two prefabricated panels, characterized in that: The plate seam is provided with a PE foam strip (1), a structural adhesive (2), a stainless steel elastic folding net (3) and a high-ductility polymer mortar (4) in sequence from the inside to the outside; the stainless steel elastic folding net (3) is folded in a wave shape and expands and contracts along the width direction of the plate seam, and the inner and outer ends of the stainless steel elastic folding net (3) are respectively embedded in the structural adhesive (2) and the high-ductility polymer mortar (4); the outer end cover of the plate seam is provided with a JS flexible transition layer (5); a mesh cloth reinforcement layer (6) is embedded in the JS flexible transition layer (5); a decorative surface layer (7) is bonded to the surface of the JS flexible transition layer (5); the wire diameter of the stainless steel elastic folding net (3) ranges from 0.3 mm to 1.0 mm, and the mesh aperture ranges from 8 mm to 20 mm; the stainless steel elastic folding net (3) comprises 5 to 12 folding surfaces, and the expansion and contraction range of the stainless steel elastic folding net (3) is 20 mm to 60 mm.

2. The anti-cracking treatment structure for the joints of the assembled exterior wall prefabricated panels according to claim 1 is characterized in that: The length of the folding surface along the depth direction of the plate hole is 30mm-50mm.

3. The anti-cracking treatment structure for the joints of the assembled exterior wall prefabricated panels according to claim 1 is characterized by: The overall length of the stainless steel elastic folding net (3) is 600 mm-1200 mm.

4. The anti-cracking treatment structure for the joints of the assembled exterior wall prefabricated panels according to claim 1 is characterized in that: The structural adhesive (2) has a gluing depth of 30 mm to 50 mm.

5. The anti-cracking treatment structure for joints of prefabricated exterior wall panels according to claim 1 is characterized in that: The stainless steel elastic folding net (3) is embedded in the structural adhesive (2) by 15 mm to 25 mm.

6. The anti-cracking treatment structure for joints of prefabricated exterior wall panels according to claim 1 is characterized in that: The JS flexible transition layer (5) has a thickness of 5 mm to 10 mm.

7. The anti-cracking treatment structure for joints of prefabricated exterior wall panels according to claim 1 is characterized in that: Both ends of the JS flexible transition layer (5) extend beyond the plate seam by 80 mm to 120 mm.

8. A method for treating cracks in the joints of prefabricated exterior wall panels using the joint crack prevention treatment structure of prefabricated exterior wall panels according to any one of claims 1 to 7, characterized in that: The following steps are involved: ① Clean the joints of the prefabricated panels and fill them with PE foam strips (1); ② Fill the joints with structural adhesive (2); ③ Compress the stainless steel elastic folding net (3) and insert it into the joints and embed it into the structural adhesive (2); ④ Fill with high-ductility polymer mortar (4), compact it and smooth the surface; ⑤ Apply a JS flexible transition layer (5) on the surface of the reserved setback, and embed a mesh cloth reinforcement layer (6) inside the JS flexible transition layer (5).

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