A sealing device and construction method for the exterior wall of a prefabricated building transfer layer

Abstract

This invention relates to the field of prefabricated exterior wall construction technology for prefabricated building transfer layers, and discloses a sealing device and construction method for the exterior wall of a prefabricated building transfer layer. The device includes a cast-in-place wall, vertically installed; a prefabricated wall, comprising an exterior wall panel and an insulation board fixedly connected to the exterior wall panel; a composite slab cast-in-place layer fixedly connected to the cast-in-place wall; a sealing mechanism comprising an extruded polystyrene board fixedly connected to the cast-in-place wall; and a grouting mechanism comprising a PE strip and an inner sealing strip. The PE strip is disposed between the extruded polystyrene board and the insulation board, and the inner sealing strip is disposed on the composite slab cast-in-place layer. The PE strip, inner sealing strip, exterior wall panel, and cast-in-place wall constitute a grouting zone. This method saves labor costs and material usage, shortens the construction period, and the overall structural form is simple and convenient to construct, greatly improving construction efficiency.

Description

Technical Field

[0001] This invention belongs to the field of prefabricated exterior wall construction technology for prefabricated building transfer layers, specifically relating to a sealing device and construction method for the exterior wall of a prefabricated building transfer layer. Background Technology

[0002] In recent years, with the continuous development of my country's construction industrialization and the increasing pursuit of green, energy-saving, economical, and environmentally friendly practices, prefabricated buildings have become an important development direction for my country's construction industry. Prefabricated structures are concrete structures where precast components are reliably connected through grouting sections and cast-in-place joints. In the construction of prefabricated shear walls, the construction of the transfer layer is a key node for ensuring the overall structural integrity, and the sealing of the joint between the precast and cast-in-place exterior walls is a core process in prefabricated structure construction.

[0003] In traditional construction methods, at the joints of the exterior walls at the transition layer location, PE strips are used to seal the precast wall on the outer side (near the insulation board). These strips are positioned along the edge of the steel support on the outer side of the cast-in-place exterior wall, forming a closed loop along the entire length of the building's exterior wall. Even after being compacted to the joint height (typically 2cm), they retain a certain strength, thus achieving a sealing effect. However, in practical applications, this method often results in quality defects such as incomplete sealing leading to grout leakage. Furthermore, the cost of the steel supports is relatively high, failing to achieve cost savings. Even worse, some contractors directly use edge-sealing material to seal the outer gaps, which occupies space meant for the grouting layer and poses a safety hazard to the overall structure.

[0004] Currently, the methods for sealing the exterior of walls are not mature, but they are indispensable in prefabricated building projects. Through long-term research, the applicant has discovered a more convenient, effective, reasonable and practical sealing structure and construction method for this type of sealing support structure, which ensures the grouting quality of the prefabricated wall. Summary of the Invention

[0005] To address this issue, the present invention provides a sealing device and construction method for the exterior wall of the transfer layer in prefabricated buildings, in order to solve the problem of insecure sealing and unstable connection of joints at the transfer layer location in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] On one hand, embodiments of this specification provide a sealing device for the exterior wall of a prefabricated building transfer layer, comprising:

[0008] Cast-in-place walls, installed vertically;

[0009] A precast wall, comprising an exterior wall panel and an insulation board fixedly connected to the exterior wall panel;

[0010] The composite slab is cast-in-place and fixedly connected to the cast-in-place wall.

[0011] The sealing mechanism includes an extruded polystyrene board, which is fixedly connected to the cast-in-place wall; and

[0012] The grouting mechanism includes a PE strip and an inner sealing strip. The PE strip is disposed between the extruded polystyrene board and the insulation board, and the inner sealing strip is disposed on the cast-in-place layer of the composite slab. The PE strip, the inner sealing strip, the outer wall panel, and the cast-in-place wall constitute the grouting zone.

[0013] Furthermore, the sealing mechanism also includes:

[0014] Adhesive mortar is used to fix the extruded polystyrene board to the cast-in-place wall.

[0015] Insulation nails are used to reinforce and fix the extruded polystyrene board to the cast-in-place wall.

[0016] Furthermore, the extruded polystyrene board is flush with the top edge of the cast-in-place wall, and the bottom of the extruded polystyrene board is provided with a top-return mechanism.

[0017] Furthermore, the top-return mechanism includes:

[0018] Through-wall bolts are installed at the bottom of the extruded polystyrene board and penetrate the cast-in-place wall;

[0019] A support is provided between the through-wall bolt and the extruded polystyrene board.

[0020] Furthermore, the support block includes timber.

[0021] Furthermore, the inner sealing strip includes a sealing strip made of slurry.

[0022] Furthermore, the prefabricated wall panel also includes an outer leaf plate, which is fixedly connected to the insulation board, and the insulation board is disposed between the outer wall panel and the outer leaf plate.

[0023] Furthermore, the PE strip includes a foamed polyethylene sealing strip.

[0024] Furthermore, the sealing mechanism also includes a decorative surface layer disposed on the outermost side, and a weather-resistant adhesive is provided between the decorative surface layer and the precast wall panel.

[0025] On the other hand, the embodiments of this specification provide a construction method for the sealing device of the exterior wall of the transfer layer of the above-mentioned prefabricated building, including the following steps:

[0026] When setting up the formwork for the cast-in-place wall at the transfer layer location, a through-wall bolt with a spacing of 900mm is installed 260mm below the top of the wall. This bolt is retained when the formwork is removed. After the formwork is removed, the outer wall surface base within a range of 200mm below the top of the wall is treated to ensure flatness.

[0027] Measure and lay out the lines, and mark a 200mm elevation control line.

[0028] Wooden blocks are erected on top of the through-wall bolts, and 10mm thick adhesive mortar is applied to the bonding area to ensure that the extruded polystyrene board is tightly bonded to the cast-in-place wall.

[0029] Insulation nails are driven into the extruded polystyrene board, penetrating 50mm into the wall, centered vertically, and arranged horizontally at 500mm intervals.

[0030] The PE strip should be tightly attached to the extruded polystyrene board using double-sided tape, and placed with the top edge of the extruded polystyrene board aligned with the joint of the cast-in-place wall. It must not penetrate the wall structure.

[0031] The precast wall is hoisted into place, PE strips are pressed on the outside of the wall, and grout is applied to the inside to seal the edges. Grouting is carried out after the design strength is reached.

[0032] The extruded polystyrene board conforms to the design for external wall insulation and does not need to be removed. The cavity at the junction with the precast wall is sealed with weather-resistant sealant. The decorative surface layer is constructed according to the design. This completes the process.

[0033] This invention has the following advantages: by extruding PE strips to seal the outer side of the exterior wall, a tight seal is achieved, improving the fullness of grouting and ensuring the quality of grouting construction; the PE strips do not penetrate the wall structure, enhancing the wall's load-bearing capacity and ensuring the integrity of the wall structure; grout leakage at the joints of the exterior wall of the transition layer is avoided, achieving the purpose of maintaining the integrity and originality of the wall surface; the tight grouting at the wall junction improves the wall's waterproofness; the material for external wall insulation of the cast-in-place wall in the exterior decoration project of the design drawings is used rationally, avoiding the later removal of temporary supports, which is green and environmentally friendly while saving labor costs, material usage, and shortening the construction period; the overall structural form is simple and convenient to construct, greatly improving construction efficiency. Attached Figure Description

[0034] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0035] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0036] Figure 1 This is a schematic cross-sectional view of the sealing structure according to an embodiment of the present invention;

[0037] Figure 2 This is a schematic elevation view of the sealing structure according to an embodiment of the present invention;

[0038] Figure 3 This is a schematic diagram of the structure of the joint of the extruded polystyrene board in an embodiment of the present invention. Detailed Implementation

[0039] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. However, those skilled in the art will understand that the embodiments described below are some embodiments of the present invention, but not all embodiments, and are only used to illustrate the present invention, and should not be regarded as limiting the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Example 1

[0041] Example 1 of this specification provides a sealing device for the exterior wall of a prefabricated building transfer floor. Please refer to [link / reference]. Figure 1 , Figure 2 and Figure 3 As shown, it includes: sealing part 1, precast wall 2, grouting part 3 and cast-in-place wall 4, which are tightly spliced ​​at the joint of the transition layer wall.

[0042] The precast wall 4 is vertically arranged. The precast wall 2 includes an outer wall panel 2.3 and an insulation board 2.2 fixedly connected to the outer wall panel. In one possible implementation, the precast wall 2 consists of an outer wall panel 2.3, an insulation board 2.2, and an outer leaf panel 2.1 from the inside out. The composite slab cast-in-place layer 6 is fixedly connected to the cast-in-place wall 4, and has a composite slab precast layer 7 at its bottom. The sealing mechanism 1 includes an extruded polystyrene board 1.1, which is fixedly connected to the cast-in-place wall 4. The grouting mechanism 3 includes a PE strip 3.1 and an inner sealing strip 3.3. The PE strip is placed between the extruded polystyrene board and the insulation board, and the inner sealing strip is placed on the composite slab cast-in-place layer. The PE strip, the inner sealing strip, the outer wall panel, and the cast-in-place wall constitute the grouting area 3.2. The precast wall 2 is vertically aligned with the sealing structure and tightly spliced ​​with the lower cast-in-place wall 4. The inner sealing strip includes, but is not limited to, a sealing strip using grout material 3.3. PE strips include, but are not limited to, foamed polyethylene sealing strips. The sealing mechanism also includes a decorative surface layer 1.4 located on the outermost side, with weather-resistant adhesive 5 between the decorative surface layer 1.4 and the precast wall panel, specifically located between the decorative surface layer 1.4 and the outer leaf plate 2.1.

[0043] In one possible implementation, the sealing mechanism also includes bonding mortar 1.2 and insulation nails 1.3. The extruded polystyrene board 1.1 is fixedly connected to the cast-in-place wall 4 by bonding mortar 1.2; the extruded polystyrene board 1.1 is further fixed to the cast-in-place wall 4 by insulation nails 1.3, thereby achieving a stable connection.

[0044] In one possible implementation, the extruded polystyrene board 1.1 is flush with the top edge of the cast-in-place wall 4, and a back-pull mechanism is provided at the bottom of the extruded polystyrene board 1.1. The back-pull mechanism includes through-wall bolts 8 and a support body 9; the through-wall bolts are located at the bottom of the extruded polystyrene board and penetrate through the cast-in-place wall; the support body is located between the through-wall bolts and the extruded polystyrene board. The support block includes, but is not limited to, the use of timber.

[0045] In one possible implementation, the extruded polystyrene board 1.1 in the sealing structure has an overall height of 200mm and a thickness of 130mm. The specific dimensions must match the tongue and groove joint at the bottom of the precast wall 2. The extruded polystyrene board 1.1 is backfilled using a combination of "through-wall bolts 8 + timber 9". The through-wall bolts 8 are recessed 260mm downwards with a horizontal spacing of 900mm. The timber 9 is 60mm high and 100mm thick, overlapping the through-wall bolts 8 and laid along the exterior wall. The extruded polystyrene board 1.1 is fixed to the cast-in-place wall 4 using "adhesive mortar 1.2 + insulation nails 1.3". The adhesive mortar 1.2 has a full adhesion height of 200mm and a thickness of 5mm. The insulation nails 1.3 are centered vertically, penetrating approximately 450mm into the cast-in-place wall, spaced 500mm apart, and arranged horizontally. The surface of the cast-in-place wall 4 where the adhesive mortar 1.2 is applied should be clean and smooth, ensuring the adhesion is tight. PE strip 3.1 should be affixed to the top edge of extruded polystyrene board 1.1 at the boundary between it and the cast-in-place wall 4, and must not extend into the grouting zone 3.2. Extruded polystyrene board 1.1 should meet the load-bearing requirements for compressing the interaction of PE strip 3.1. Extruded polystyrene board 1.1 should be consistent with the insulation method of the cast-in-place wall 4 in the architectural design drawings, combining permanent and temporary applications. PE strip 3.1 is made of foamed polyethylene. A 5mm decorative surface layer 1.4 is reserved on the outer side of extruded polystyrene board 1.1.

[0046] Example 2

[0047] Example 2 of this specification provides a construction method for a sealing device for the exterior wall of a prefabricated building transfer layer, comprising the following steps:

[0048] A. When the cast-in-place wall at the transfer layer location is supported by 4 formwork, a through-wall bolt with 8 bolts spaced at 900mm intervals is installed 260mm below the top of the wall. This bolt is retained when the formwork is removed. After the formwork is removed, the outer wall surface base layer within 200mm below the top of the wall is treated to ensure flatness.

[0049] B. Measure and lay out the lines, and mark a 200mm elevation control line;

[0050] C. A wooden beam 9 is erected on top of the through-wall bolt 8, and a 10mm thick adhesive mortar 1.2 is applied to the bonding area. The extruded polystyrene board 1.1 is tightly bonded to the cast-in-place wall 4.

[0051] D. Insulation nails 1.3 are driven into the extruded polystyrene board 1.1, 50mm into the wall, centered vertically, and arranged horizontally at 500mm intervals;

[0052] E. PE strip 3.1 shall be tightly attached to extruded polystyrene board 1.1 with double-sided tape, and placed at the top edge of extruded polystyrene board 1.1 aligned with the joint of cast-in-place wall 4, and shall not enter the wall structure;

[0053] F. The precast wall 2 is hoisted into place, the outer side of the wall is compacted with PE strips 3.1, the inner side is sealed with grout 3.3, and grouting is carried out after the design strength is reached;

[0054] G. Extruded polystyrene board 1.1 conforms to the design of external wall insulation and is exempt from removal. The cavity at the junction with the precast wall 2 is sealed with weather-resistant sealant 5. The decorative surface layer 1.4 is constructed according to the design. This completes the process.

[0055] This invention is not limited to the above-described optional embodiments. Anyone can derive other various forms of products under the guidance of this invention. However, regardless of any changes made in their shape or structure, any technical solution that falls within the scope of the claims of this invention shall be protected by this invention.

Claims

1. A sealing device for the outer wall of a prefabricated building transfer floor, characterized in that, include: Cast-in-place walls, installed vertically; A precast wall, comprising an exterior wall panel and an insulation board fixedly connected to the exterior wall panel; The composite slab is cast-in-place and fixedly connected to the cast-in-place wall. The sealing mechanism includes an extruded polystyrene board, which is fixedly connected to the cast-in-place wall; and The grouting mechanism includes a PE strip and an inner sealing strip. The PE strip is disposed between the extruded polystyrene board and the insulation board, and the inner sealing strip is disposed on the cast-in-place layer of the composite slab. The PE strip, the inner sealing strip, the outer wall panel, and the cast-in-place wall constitute the grouting zone. The sealing mechanism further includes: Adhesive mortar is used to fix the extruded polystyrene board to the cast-in-place wall. Insulation nails are used to reinforce and fix the extruded polystyrene board to the cast-in-place wall; the top edge of the extruded polystyrene board is flush with the top edge of the cast-in-place wall, and a top-returning mechanism is provided at the bottom of the extruded polystyrene board; the top-returning mechanism includes: Through-wall bolts are installed at the bottom of the extruded polystyrene board and penetrate the cast-in-place wall; A support is provided between the through-wall bolt and the extruded polystyrene board.

2. The sealing device for the exterior wall of a prefabricated building transfer layer as described in claim 1, characterized in that, The support structure includes timber.

3. The sealing device for the exterior wall of a prefabricated building transfer layer as described in claim 1, characterized in that, The inner sealing strip includes a sealing strip made of grout.

4. The sealing device for the exterior wall of a prefabricated building transfer layer as described in claim 1, characterized in that, The precast wall also includes an outer leaf plate, which is fixedly connected to the insulation board, and the insulation board is disposed between the outer wall panel and the outer leaf plate.

5. The sealing device for the exterior wall of a prefabricated building transfer layer as described in claim 1, characterized in that, The PE strip includes a foamed polyethylene sealing strip.

6. The sealing device for the exterior wall of a prefabricated building transfer layer as described in claim 1, characterized in that, The sealing mechanism also includes a decorative surface layer disposed on the outermost side, and a weather-resistant sealant is provided between the decorative surface layer and the precast wall.

7. The construction method of the sealing device for the exterior wall of the transfer layer of a prefabricated building as described in any one of claims 1-6, characterized in that, Includes the following steps: When setting up the formwork for the cast-in-place wall at the transfer layer location, a through-wall bolt with a spacing of 900mm is installed 260mm below the top of the wall. This bolt is retained when the formwork is removed. After the formwork is removed, the outer wall surface base within a range of 200mm below the top of the wall is treated to ensure flatness. Measure and lay out the lines, and mark a 200mm elevation control line. Wooden blocks are erected on top of the through-wall bolts, and 10mm thick adhesive mortar is applied to the bonding area to ensure that the extruded polystyrene board is tightly bonded to the cast-in-place wall. Insulation nails are driven into the extruded polystyrene board, penetrating 50mm into the wall, centered vertically, and arranged horizontally at 500mm intervals. The PE strip should be tightly attached to the extruded polystyrene board using double-sided tape, and placed with the top edge of the extruded polystyrene board aligned with the joint of the cast-in-place wall. It must not penetrate the wall structure. The precast wall is hoisted into place, PE strips are pressed on the outside of the wall, and grout is applied to the inside to seal the edges. Grouting is carried out after the design strength is reached. The extruded polystyrene board conforms to the design for external wall insulation and does not need to be removed. The cavity at the junction with the precast wall is sealed with weather-resistant sealant. The decorative surface layer is constructed according to the design. This completes the process.

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