Prefabricated inner-embedded pipeline groove autoclaved aerated concrete slab and installation method

Abstract

The application discloses a prefabricated embedded pipeline groove autoclaved aerated concrete strip plate and a mounting method, and belongs to the technical field of building industrialization. The strip plate comprises a vertical pipeline groove formed by a mold punch in one time during pouring, a junction box integrally embedded and fixed with slurry before autoclaved curing, and a detachable cover plate made of a same material by using a same density and autoclaved method; and the strip plate further comprises a horizontal crossing road box matched with the vertical pipeline groove in modulus. The mounting method outputs coordinate data to guide mold production by establishing a three-dimensional parameterized model, realizes deepening design and factory prefabrication digital closed loop, and installs the cover plate through a buckle type structure after site installation and pipeline laying. The application solves the problems of structural damage, filling cracking and non-maintenance caused by secondary slotting of the ALC plate on site by using an autoclaved integrated forming method and matching with a same material, realizes real pipeline separation and reversible construction, reduces a crack development rate to zero, and improves construction efficiency by more than 60%.

Description

Technical Field

[0001] This invention belongs to the field of building industrialization and prefabricated building technology, and particularly relates to a prefabricated autoclaved aerated concrete panel with embedded pipeline grooves and its installation method. Background Technology

[0002] With the implementation of my country's prefabricated building evaluation standard (GB / T 51129), the degree of building industrialization has become an important indicator for measuring building quality. The standard clearly requires that "building equipment and pipeline systems should be designed to be separate from the main structure to facilitate maintenance and replacement," and advocates the "pipeline separation" technical route to reduce the damage of pipelines to the main structure and achieve "reversible construction."

[0003] Autoclaved aerated concrete (ALC) panels have become the preferred material for interior partitions in prefabricated buildings due to their advantages such as lightweight, high strength, thermal insulation, fire resistance, and convenient construction. However, in current engineering practice, the installation of pipelines in ALC panels still generally follows the traditional on-site secondary trenching method used in cast-in-place construction, which has the following technical defects: First, structural damage and safety hazards. In traditional construction, after the ALC panels are installed, they need to be cut and grooved on-site according to the electromechanical drawings, with a groove depth of 20-30mm. For ALC panels with a thickness of only 100-200mm, the remaining cross-sectional thickness is significantly reduced after grooving (a 100mm panel is reduced to only 70-80mm), severely reducing the wall's load-bearing capacity and sound insulation performance. On-site grooving is arbitrary, often resulting in illegal horizontal and oblique grooves, and even cutting off the internal reinforcement of the panels, creating structural safety hazards.

[0004] Secondly, a common quality issue is interface cracking. After pipeline installation, cement mortar or special repair materials are used to fill the grooved areas. Due to the significant differences in shrinkage rate (ALC board approximately 0.3-0.5 mm / m, cement mortar approximately 1.5-2.0 mm / m) and elastic modulus between the repair materials and the ALC board substrate, under the influence of temperature changes, structural deformation, and drying shrinkage, through cracks are easily generated at the filled interface, becoming a high-risk area for cracking and water seepage, leading to repeated repairs later on.

[0005] Third, overlapping processes lead to low efficiency. Processes such as secondary trenching, pipeline laying, and filling and maintenance require multiple trades, including civil engineering and electromechanical engineering, to work together, resulting in a lengthy construction period. On-site wet work generates a large amount of dust and construction waste, polluting the environment and violating the original intention of "green construction" in prefabricated buildings.

[0006] Fourth, it violates the principle of pipeline separation. The current method of burying pipelines in trenches dug on site and then filling and sealing them is essentially still a "pipeline buried structure". If it is necessary to inspect or replace the pipelines later, the wall must be damaged, which cannot achieve "reversible construction" and violates the direction advocated by GB / T 51129.

[0007] There has long been a technical bias among those skilled in the art: that ALC panels, as lightweight panels, are inherently difficult to cut on-site, and that problems can be alleviated by using better repair materials (such as specialized ALC repair mortar) or optimizing grooving methods (such as limiting grooving depth). This bias overlooks the fundamental role of "integrated factory prefabrication" in resolving the aforementioned systemic contradictions. Specifically, this manifests as: neglecting the precision advantages of mold forming under factory production conditions for ALC panels, failing to organically combine "pipeline trench prefabrication" with "panel production" at the factory stage; neglecting the crucial role of material homogeneity in preventing interface cracking, failing to use prefabricated cover plates of the same material as the ALC panels to replace on-site filling; and neglecting the requirement for "reversible construction" in prefabricated buildings, failing to design detachable structures to achieve pipeline separation.

[0008] Therefore, there is an urgent need for a technical solution that, from the perspective of building industrialization, deeply integrates the concept of "pipeline separation" with "factory prefabrication" technology to achieve "integrated prefabrication of structure and pipeline in the factory and reversible assembly on site," thereby eliminating the systemic defects of on-site grooving from the source. Summary of the Invention

[0009] To address the shortcomings of existing technologies, such as structural damage from on-site secondary grooving, interface cracking during filling, low construction efficiency, and violation of pipeline separation principles, this invention provides a prefabricated autoclaved aerated concrete (AAC) panel with embedded pipeline grooves and its installation method. The aim is to overcome the technical bias of "on-site grooving and repair" by using a closed-loop digital approach of "detailed design - mold forming - autoclaving integration - matching materials," thereby achieving factory-based precision control and reversible on-site assembly of AAC panel pipeline installation.

[0010] To achieve the above objectives, the present invention adopts the following technical solution: A prefabricated autoclaved aerated concrete (AAC) panel with embedded pipeline channels, comprising: The slab is made of autoclaved aerated concrete. The vertical pipeline groove is formed in one step by a mold punch when the aerated concrete slurry is poured into the plate. The position of the mold punch is designed to avoid the steel mesh inside the plate. The depth of the vertical pipeline groove does not exceed 1 / 3 of the thickness of the plate. An embedded junction box is pre-embedded and fixed together with the slurry before autoclaving, and the opening of the embedded junction box is connected to the vertical pipeline groove. The detachable cover plate is made of the same material with the same density and autoclaving method as the plate body. The cover plate is detachably connected to the side wall of the vertical pipeline groove through a snap-fit ​​connection structure. The front of the cover plate is flush with the surface of the plate body.

[0011] A method for installing prefabricated autoclaved aerated concrete (AAC) strip panels with embedded pipeline grooves, using the aforementioned strip panels, includes the following steps: Pipeline integration and detailed design steps: Establish a three-dimensional parametric model of the ALC board and pipeline trench; design the wall panel layout according to the electromechanical construction drawings; determine the pipeline route and the positions of switches and sockets; and output the precise coordinate positioning data of the vertical pipeline trench and the pre-embedded junction box. Factory prefabrication production steps: According to the coordinate positioning data, positioning holes are opened on the mold base plate, and the mold punch is fixed with bolts to ensure that the position of the punch deviates from the detailed design by ≤2mm; the optimized reinforcement mesh is placed into the mold and avoids the position of the punch; aerated concrete slurry is poured and the embedded junction box is pre-embedded in one piece before autoclaving; after high temperature and high pressure autoclaving, the mold is demolded, and the detachable cover plate with the same density and autoclaving method as the plate is produced simultaneously; On-site installation preparation steps: Clean the installation base layer, install a full-length horizontal junction box in the middle or top / bottom of the wall, and ensure that the socket interface of the horizontal junction box matches the module of the vertical pipeline groove; ALC panel installation steps: hoist the prefabricated ALC panel into position and adjust its verticality to ensure that the vertical pipeline grooves of adjacent panels correspond to form a continuous vertical channel and are connected to the socket interface of the horizontal cross-pass box. Pipeline laying steps: Lay the vertical pipeline along the vertical pipeline trench, complete the horizontal turn in the horizontal junction box, and complete the wire installation in the pre-embedded junction box; Cover plate installation steps: After the pipeline laying is accepted, install the detachable cover plate through the snap-on connection structure so that the front of the cover plate is flush with the surface of the plate body, and treat the joint with elastic sealant.

[0012] As a further improvement of the present invention, the depth of the vertical pipeline groove is 15-25mm and does not exceed 1 / 3 of the plate thickness; the steel mesh is densely distributed with transverse steel bars on both sides of the vertical pipeline groove; the minimum horizontal distance between the mold punch and the steel mesh is ≥20mm.

[0013] As a further improvement of the present invention, it also includes a horizontal passage box structure, wherein the two sides of the horizontal passage box are provided with socket interfaces that match the module of the vertical pipeline groove, and the top of the horizontal passage box is provided with an openable maintenance cover plate, wherein the thickness of the maintenance cover plate is the same as that of the detachable cover plate to ensure the flatness of the wall surface.

[0014] Compared with the prior art, the present invention has the following advantages: (1) Methodological Collaboration Overcomes Technical Bias: The traditional thinking that "on-site cutting of ALC boards is unavoidable" is abandoned. Through a closed-loop digital method integrating design, mold punch, and autoclaving, the pipeline trench, embedded junction box, and board are integrally formed before autoclaving (in slurry state). This time-series coupling is absolutely impossible to achieve with on-site grooving (ALC boards cannot be autoclaved on-site), fundamentally eliminating the arbitrariness and destructiveness of on-site grooving, and realizing industrial precision control of "design is production data, and production is the final product".

[0015] (2) Unexpected crack prevention effect achieved with the same material and method: By using the same material as the plate and the same autoclaving method to make the cover plate, the shrinkage rate (both ≤0.5mm / m), coefficient of thermal expansion, and modulus of elasticity of the cover plate and the plate are completely consistent. According to comparative tests, the crack development rate of the groove filled by traditional cement mortar (shrinkage rate 1.8mm / m) reached 65% after 10 dry and wet cycles, while the crack development rate of the snap-fit ​​connection of the cover plate of the present invention was 0%, and the sound insulation was improved by 3-5dB compared with the traditional filling. This combination of "material homogeneity + dry connection" produced unexpected technical effects.

[0016] (3) Modular integration achieves true pipeline separation: Through modular matching socket interfaces (with a gap of ≤3mm) between horizontal junction boxes and vertical pipeline channels, precise factory connection of horizontal and vertical pipelines is achieved, avoiding the chaos of on-site cutting. With the addition of detachable cover plates, pipelines can be replaced directly by removing the cover plates during later maintenance without damaging the wall, which meets the requirements of GB / T 51129 "pipeline separation" and "reversible construction", and significantly reduces the maintenance cost of the building throughout its entire life cycle.

[0017] (4) Structural safety and industrial efficiency are improved simultaneously: By optimizing the reinforcement (densified steel bars on both sides of the pipeline trench) to compensate for the weakening of the cross section, it is calculated that the bearing capacity of a 100mm thick plate after grooving is reduced by less than 5% (compared to more than 25% for traditional grooving); Factory prefabrication decouples the on-site installation and pipeline laying processes, shortens the construction period by more than 30% compared with the traditional secondary grooving method, and eliminates wet operations and dust pollution. Attached Figure Description

[0018] Figure 1 The flowchart of the prefabricated autoclaved aerated concrete (AAC) panel with embedded pipeline grooves and the installation method of the present invention shows the complete process from pipeline integrated detailed design, factory prefabrication, on-site installation preparation, AAC panel installation, pipeline laying, installation of detachable cover plates to subsequent reversible maintenance. Detailed Implementation

[0019] The technical solution of the present invention will be described in detail below with reference to the embodiments. The embodiment takes a prefabricated steel structure residential project as an example. The interior partition walls are made of 100mm thick autoclaved aerated concrete panels. The standard floor height is 2.8m and the wall panel width is 600mm. It is necessary to lay pipelines for strong current, weak current, water supply and other services.

[0020] Example 1: Prefabricated embedded pipeline groove ALC strip structure and factory prefabrication The ALC panel in this embodiment includes a panel body, a vertical pipeline groove, a pre-embedded junction box, a detachable cover plate, and a horizontal passage box.

[0021] (1) Detailed design and mold preparation A 3D parametric model of the ALC slab and MEP (Mechanical, Electrical, and Plumbing) pipelines was created using BIM (Building Information Modeling) technology. Based on the MEP construction drawings, the locations of the vertical pipeline trenches were determined: avoiding the area within 500mm below structural beams and within 300mm of door and window openings, and preferentially placing them 150mm from the slab edge. The model outputs precise coordinate data for each trench location, with deviations controlled within 2mm.

[0022] Based on the detailed design data, a specialized mold is manufactured. The mold includes a base plate, side molds, and a punch. The base plate is made of 20mm thick Q235 steel plate, with positioning holes drilled according to the coordinate data, with a hole position accuracy of ±1mm. The punch is made of polytetrafluoroethylene or steel, with a trapezoidal cross-section, 40mm wide at the top, 30mm wide at the bottom, and 20mm high. Bolts are welded to the bottom, and the punch is fixed to the base plate with nuts, ensuring that the position of the punch deviates from the detailed design by no more than 2mm.

[0023] (2) Optimization and avoidance of steel mesh The ALC plate is fitted with a steel mesh made of 4mm diameter cold-drawn steel wire with a mesh size of 50mm x 50mm. The spacing of the steel bars in the mesh is adjusted according to the position of the punch: within 50mm on both sides of the vertical pipe channel, the horizontal steel bars are densified to a spacing of 30mm, while the longitudinal steel bars maintain a 50mm spacing but are partially interrupted to avoid the punch. This ensures that the minimum horizontal distance between the punch and the steel bars is not less than 20mm, preventing the steel bars from interfering with the punch's formation during casting.

[0024] (3) Pre-embedded junction box is fixed in one piece The embedded junction box uses a type 86 metal junction box, with anchoring claws welded to both sides of the box body. After the reinforcing mesh is placed into the mold, the junction box is placed at the designed position on the side of the punch and fixed to the reinforcing mesh by the anchoring claws. A temporary sealing cap is installed at the box opening to prevent subsequent grout from entering the box.

[0025] (4) Steam pressing integrated molding method The assembled mold is placed into the pouring station. Aerated concrete slurry is poured, with a mix ratio of cement:lime:sand:aluminum powder paste = 1:0.4:2.5:0.001 and a water-to-material ratio of 0.6. The slurry level is flush with the mold. After static curing at 40-50℃ for 2-3 hours, the slurry initially sets to form a green body.

[0026] The billet and mold are fed into an autoclave for high-temperature and high-pressure curing: the temperature is raised to 180-200℃ for 2 hours, the pressure is raised to 1.0-1.2MPa, and the temperature and pressure are maintained for 8-12 hours. During this process, the slurry hydrates and crystallizes to form a tobermorite crystal structure. The pre-embedded junction box is mechanically engaged with the plate through anchor claws, and a smooth vertical pipeline groove is formed at the punch. After autoclaving, the temperature and pressure are reduced, and the plate is demolded and removed.

[0027] At this point, the vertical pipeline trench is 20mm deep, which is one-fifth of the 100mm thick plate. The inner wall has excellent smoothness and requires no secondary processing. The pre-embedded junction box is firmly attached to the plate and has a pull-out resistance of not less than 500N. The steel mesh forms a reinforcing zone in the densified area on both sides of the trench to compensate for the weakening of the cross section.

[0028] (5) Prefabrication of cover plates using the same materials and methods Simultaneous production of detachable cover plates: using the exact same mix ratio as the plate body to ensure the same density, using the same mold base plate, and curing and molding by the same steam pressure method, temperature 180-200℃, pressure 1.0-1.2MPa, duration 8-12h.

[0029] Cover plate dimensions: thickness 20mm, matching the groove depth; width 50mm, 40mm wider than the groove, with a 5mm overlap on each side; length 2800mm, matching the plate height. The cover plate has pre-embedded elastic claws on the back, made of 0.8mm thick stainless steel spring steel sheets, in a barbed shape, with a claw spacing of 300mm.

[0030] (6) Transverse passage box structure The horizontal access box is made of 1.2mm thick galvanized steel sheet, bent to a cross-section of 100mm × 50mm and a length of 600mm, matching the width of the wall panel. Socket interfaces are provided on both sides of the box, with dimensions matching the vertical conduit groove module: 42mm wide and 22mm high, and equipped with a 3mm elastic sealing strip. An openable maintenance cover, 20mm thick, is installed on the top of the box, consistent with the removable cover, and is connected via a hinge.

[0031] Example 2: Integrated Installation Method Step S1: On-site installation preparation Clean the floor slab installation substrate and mark the wall control lines. Install a full-length horizontal junction box at the center of the wall, 1.4m from the ground, or inside the ceiling: fix it to the main structure with expansion bolts at 600mm intervals, ensuring the horizontal deviation of the junction box does not exceed 3mm per linear meter. Adjust the orientation of the socket joints to correspond to the position of the vertical pipe groove on the ALC board, leaving a 2-3mm gap between the joints.

[0032] Step S2: ALC panel hoisting and positioning The prefabricated ALC panels are hoisted to the installation location, and the bottom of the panels is temporarily fixed with wooden wedges. The verticality is adjusted, and the deviation is controlled within 3mm every 2m. Special U-shaped clips are used to fix the panels to the floor slabs and beams at 600mm intervals. A 3mm thick EPDM elastic gasket is placed between the clips and the panels to allow for temperature deformation.

[0033] During installation, ensure that the vertical pipe grooves of adjacent panels are naturally aligned to form a continuous vertical channel. Align the groove opening with the socket of the horizontal junction box, and fill the interface with elastic sealing strip after insertion to ensure a tight fit.

[0034] Step S3: Pipeline Laying PVC-U flame-retardant electrical conduit, 20mm in diameter and half the width of the 40mm trench, is inserted through pre-reserved openings in the floor slab or electrical shafts, and laid downwards or upwards along the vertical conduit trench. After entering the horizontal junction box, the conduit makes a horizontal turn inside the box, passing through tees or elbows inside the junction box, or branching to other locations.

[0035] Complete the wiring inside the pre-embedded junction box, leaving a length of 150mm. Before installing the switch and socket panel inside the junction box, remove the temporary sealing cover.

[0036] Step S4: Install cover plate of the same material After the pipeline installation is completed and insulation testing is passed (insulation resistance not less than 0.5MΩ), a removable cover plate is installed. Clean any debris from the trench. Align the elastic claws on the back of the cover plate with the pre-drilled slots on the sidewall of the vertical pipeline trench. The slots are dovetail-shaped, 5mm deep, and match the claws. Push the cover plate in from bottom to top; the claws will spring into the slots and lock under pressure. The front of the cover plate is flush with the surface of the panel. Inject acrylic elastic sealant at the joints, with an elongation of not less than 300% to accommodate shrinkage.

[0037] The inspection cover on top of the transverse junction box is closed simultaneously to ensure that the overall flatness deviation of the wall surface does not exceed 2mm per 2m.

[0038] Step S5: Finishing Application and Effect Verification The wall is fully covered with alkali-resistant fiberglass mesh. Since the cover plate and the board are made of the same material and using the same method, the surface is very smooth. Putty can be applied directly without plastering, and paint can be applied by roller.

[0039] Engineering practice has verified that, after the ALC board described in this embodiment is installed, compared with the traditional on-site secondary grooving repair method: Crack control: Because the same cover plate with the same density and autoclaving method as the slab is used, the shrinkage rate of the cover plate and the slab is consistent. Combined with the snap-on dry connection, the interface cracking problem caused by the shrinkage rate difference in traditional cement mortar filling is fundamentally eliminated. The crack resistance of the joint is significantly better than that of traditional grooved repair method, and the long-term durability is good. Sound insulation performance: The homogeneous cover plate forms a continuous whole with the plate body, without through cracks, and the sound insulation performance is significantly better than that of traditional grooved repairs, which are prone to cracking and resulting in a local decrease in sound insulation. Structural safety: By optimizing the reinforcement, the horizontal reinforcement is increased on both sides of the vertical pipeline trench, which effectively compensates for the weakening of the cross section. Moreover, the trench depth is controlled within one-fifth of the slab thickness, and the overall bearing capacity is fully guaranteed. Construction efficiency: Factory prefabrication decouples on-site installation from pipeline laying, eliminating wet operations such as on-site trenching, repair, and maintenance, significantly shortening the construction period, and eliminating on-site dust pollution, which meets the requirements of green construction.

[0040] Step S6: Reversible Inspection In later use, when a circuit needs maintenance, use a thin blade to cut open the sealant on both sides of the cover plate, pry the cover plate to disengage the elastic clips from their slots, and the cover plate can be removed to fully expose the pipeline inside the vertical pipeline trench for replacement or repair. After maintenance, the cover plate is reinstalled in its original position and resealed with sealant, without any damage to the plate structure, achieving truly reversible construction and solving the problem of traditional buried pipelines being impossible to maintain.

[0041] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A prefabricated autoclaved aerated concrete (AAC) strip panel with embedded pipeline grooves, characterized in that, include: The slab is made of autoclaved aerated concrete. The vertical pipeline groove is formed in one step by a mold punch when the aerated concrete slurry is poured into the plate. The position of the mold punch is designed to avoid the steel mesh inside the plate. The depth of the vertical pipeline groove does not exceed 1 / 3 of the thickness of the plate. An embedded junction box is pre-embedded and fixed together with the slurry before autoclaving, and the opening of the embedded junction box is connected to the vertical pipeline groove. The detachable cover plate is made of the same material with the same density and autoclaving method as the plate body. The cover plate is detachably connected to the side wall of the vertical pipeline groove through a snap-fit ​​connection structure. The front of the cover plate is flush with the surface of the plate body.

2. The autoclaved aerated concrete (AAC) strip panel according to claim 1, characterized in that, The vertical pipeline trench has a rectangular or trapezoidal cross-section, with a trench width of 30-50mm and a trench depth of 15-25mm. The steel mesh has densely distributed horizontal steel bars on both sides of the vertical pipeline trench to compensate for the weakening of the cross-section. The minimum horizontal distance between the mold punch and the steel mesh is ≥20mm.

3. The autoclaved aerated concrete (AAC) strip panel according to claim 1, characterized in that, The embedded junction box is made of metal or flame-retardant plastic. Before autoclaving, the embedded junction box is fixed to the steel mesh by anchoring claws. The opening of the embedded junction box is provided with a temporary sealing cap to prevent slurry from entering during the curing period.

4. The autoclaved aerated concrete (AAC) strip panel according to claim 1, characterized in that, The thickness of the detachable cover plate is the same as the depth of the vertical pipeline groove, and the width of the cover plate is greater than the width of the vertical pipeline groove to ensure that the two sides overlap. The back of the cover plate is provided with elastic claws, and the side wall of the vertical pipeline groove is provided with corresponding dovetail-shaped reserved slots.

5. The autoclaved aerated concrete (AAC) strip panel according to claim 1, characterized in that, It also includes a horizontal passage box structure, which is set along the length of the wall. The horizontal passage box has socket interfaces on both sides that match the module of the vertical pipeline groove. The top of the horizontal passage box is provided with an openable maintenance cover plate. The maintenance cover plate has the same thickness as the detachable cover plate to ensure the flatness of the wall surface.

6. A method for installing prefabricated autoclaved aerated concrete (AAC) strip panels with embedded pipeline grooves, using strip panels as described in any one of claims 1-5, characterized in that, Includes the following steps: Pipeline integration and detailed design steps: Establish a three-dimensional parametric model of the ALC board and pipeline trench; design the wall panel layout according to the electromechanical construction drawings; determine the pipeline route and the positions of switches and sockets; and output the precise coordinate positioning data of the vertical pipeline trench and the pre-embedded junction box. Factory prefabrication production steps: According to the coordinate positioning data, positioning holes are opened on the mold base plate, and the mold punch is fixed with bolts to ensure that the position of the punch deviates from the detailed design by ≤2mm; the optimized reinforcement mesh is placed into the mold and avoids the position of the punch; aerated concrete slurry is poured and the embedded junction box is pre-embedded in one piece before autoclaving; after high temperature and high pressure autoclaving, the mold is demolded, and the detachable cover plate with the same density and autoclaving method as the plate is produced simultaneously; On-site installation preparation steps: Clean the installation base layer, install a full-length horizontal junction box in the middle or top / bottom of the wall, and ensure that the socket interface of the horizontal junction box matches the module of the vertical pipeline groove; ALC panel installation steps: hoist the prefabricated ALC panel into position and adjust its verticality to ensure that the vertical pipeline grooves of adjacent panels correspond to form a continuous vertical channel and are connected to the socket interface of the horizontal cross-pass box. Pipeline laying steps: Lay the vertical pipeline along the vertical pipeline trench, complete the horizontal turn in the horizontal junction box, and complete the wire installation in the pre-embedded junction box; Cover plate installation steps: After the pipeline laying is accepted, install the detachable cover plate through the snap-on connection structure so that the front of the cover plate is flush with the surface of the plate body, and treat the joint with elastic sealant.

7. The installation method according to claim 6, characterized in that, In the factory prefabrication process, the autoclaving is a high-temperature and high-pressure curing process: temperature 180-200℃, pressure 1.0-1.2MPa, duration 8-12h, so that the embedded junction box and the plate form an integral whole. The detachable cover plate adopts the same autoclaving method as the plate to ensure that the shrinkage rate is consistent, i.e. ≤0.5mm / m.

8. The installation method according to claim 6, characterized in that, In the on-site installation preparation steps, the horizontal passage box is made of galvanized steel plate with a cross-sectional dimension of width × height = 100mm × 50mm. The gap between the socket and the vertical pipeline groove is ≤3mm, and the joint is filled with elastic sealing strip.

9. The installation method according to claim 6, characterized in that, In the pipeline laying step, the vertical pipeline uses flame-retardant PVC pipe or metal pipe, and the pipe diameter does not exceed 2 / 3 of the width of the vertical pipeline groove. The wire length reserved in the pre-embedded junction box is 150-200mm. In the cover plate installation step, the elongation rate of the elastic sealant is ≥300% to adapt to the synchronous shrinkage of the cover plate and the plate body.

10. The installation method according to claim 6, characterized in that, It also includes a reversible maintenance procedure: when pipeline maintenance is required, the pipeline inside the vertical pipeline trench can be exposed by removing the detachable cover plate. After maintenance is completed, the cover plate can be reinstalled in situ without damaging the plate structure, thus achieving reversible construction.

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