A construction method for improving the joint quality of lightweight pressure-released wall fiber reinforced cement board

Abstract

The application discloses a construction method for improving the joint quality of fiber reinforced cement boards of light pressure relief walls, which comprises the following steps: after the construction of frame columns and frame beams is completed, arranging longitudinal and transverse main keels along the frame columns, and arranging secondary keels along the frame columns, frame beams and brick reverse ridges; after the secondary keels are fixed by expansion bolts, fixing the fiber reinforced cement boards on the main keels and the secondary keels by self-tapping screws; filling water-resistant flexible putty, fireproof elastic sealant or silicone weatherproof adhesive in the joints of adjacent fiber reinforced cement boards to form a flexible joint filling layer; before the flexible joint filling material is solidified, pressing an alkali-resistant glass fiber mesh into the putty layer at the joint of the outer facade board material, so that the glass fiber mesh spans the joint and covers the edge portions of the board materials on both sides of the joint. The application can reduce the risk of joint cracking and water seepage of the light pressure relief wall boards, avoid weakening the pressure relief function of the rigid mortar filling layer, and improve the overall integrity and flatness of the wall surface.

Description

Technical Field

[0001] This invention relates to the field of lightweight pressure relief wall construction technology for industrial buildings, and more specifically, to a construction method for improving the joint quality of fiber-reinforced cement board lightweight pressure relief walls. This method can be used for the construction of lightweight pressure relief walls in industrial buildings with flammable and explosive risks, such as chemical, petrochemical, combustible gas, steam, dust, or hazardous material storage facilities. Background Technology

[0002] In chemical plants, petrochemical plants, and hazardous chemical storage buildings, the raw materials, intermediates, or products used in production often possess flammable, explosive, or volatile properties. The production process may also involve hazardous conditions such as high temperature, high pressure, oxidation-reduction, cracking, and polymerization. When media leaks, static electricity buildup, uncontrolled open flames, equipment malfunctions, or operational errors occur, deflagration or detonation overpressure may occur within a very short time inside the plant. If this overpressure is not released in time, it will directly impact the main structure of the building, potentially leading to its collapse.

[0003] Traditional reinforced concrete or brick walls are rigid and lack effective pressure relief capabilities. In explosions, they can easily lead to pressure buildup and generate large, hard, sharp fragments, causing secondary injuries. To reduce the damage to the main structure caused by explosive overpressure, lightweight pressure relief walls are often installed in industrial buildings. These walls typically use lightweight, high-strength, and somewhat brittle materials such as fiber-reinforced cement boards, foamed concrete boards, and lightweight rock wool sandwich panels. When the explosive overpressure reaches the design threshold, the wall can crack or detach, thus creating a pressure relief channel.

[0004] In the construction of existing lightweight pressure relief walls, a main keel and secondary keel are often used as the support system, and then fiber-reinforced cement boards are fixed to the keel. Since the lightweight pressure relief wall is formed by splicing multiple fiber-reinforced cement boards, joints inevitably exist between adjacent boards. If traditional crack-resistant cement mortar or rigid waterproof mortar is used to seal the joints, although it can seal the joints in the short term, these rigid materials are difficult to offset the deformation stress of the joints caused by the drying shrinkage and thermal expansion of the fiber-reinforced cement boards. In the later stages, cracking and water seepage problems are likely to occur. After water seepage, the core materials such as rock wool inside the wall may become damp, clump, or settle, resulting in a decrease in thermal insulation and fire resistance performance.

[0005] Meanwhile, the rigid mortar filling layer increases the local stiffness of the joints, weakening the lightweight pressure relief wall's ability to crack or detach under explosive overpressure according to the design threshold, thus impairing its pressure relief function. Fiber-reinforced cement boards are inherently brittle, and their surface may suffer localized damage after being subjected to external forces, further affecting the waterproofing, corrosion resistance, and overall flatness of the joints.

[0006] Therefore, it is necessary to provide a construction method for the joints of lightweight pressure relief wall fiber-reinforced cement board that can simultaneously achieve joint crack prevention, seepage prevention, surface reinforcement, and pressure relief function. Summary of the Invention

[0007] The purpose of this invention is to address the problems mentioned in the background section by providing a construction method for improving the joint quality of fiber-reinforced cement board in lightweight pressure relief walls. This method solves the problems that existing methods of sealing fiber-reinforced cement board joints in lightweight pressure relief walls with rigid mortar are prone to cracking, water seepage, and potential weakening of pressure relief capacity.

[0008] The present invention adopts the following technical solution:

[0009] A construction method for improving the joint quality of fiber-reinforced cement board lightweight pressure relief walls includes the following steps:

[0010] After the frame columns and frame beams are constructed, longitudinal and transverse main joists are arranged along the frame columns, and secondary joists are arranged along the frame columns, frame beams and brick masonry curbs.

[0011] The secondary keel is fixed with expansion bolts to form a lightweight pressure relief wall keel system for installing fiber-reinforced cement boards;

[0012] Multiple fiber-reinforced cement boards are fixed to the main keel and the secondary keel with self-tapping screws to form a joint between adjacent fiber-reinforced cement boards.

[0013] The joint is filled with a flexible sealant to form a flexible sealant layer between adjacent fiber-reinforced cement boards. The flexible sealant is a water-resistant flexible putty, a fire-retardant elastic sealant, or a silicone weather-resistant sealant.

[0014] Before the flexible joint filler material cures, alkali-resistant fiberglass mesh is pressed into the putty layer at the joint of the exterior facade panels, so that the alkali-resistant fiberglass mesh spans the joint and covers the edges of the fiber-reinforced cement board on both sides of the joint.

[0015] Furthermore, the main keel is a Q235 galvanized square tube with a specification of 100mm×50mm×3.0mm.

[0016] Furthermore, the secondary keel is a U-shaped steel with dimensions of 100mm × 40mm × 0.6mm.

[0017] Furthermore, the expansion bolts are M12 expansion bolts, and the M12 expansion bolts are arranged at 800mm intervals along the secondary keel;

[0018] After the expansion bolts are installed, anti-corrosion treatment is applied to the expansion bolts and their corresponding connection locations.

[0019] Furthermore, the fiber-reinforced cement board has dimensions of 2440mm × 1220mm × 10mm.

[0020] 6. A construction method for improving the joint quality of fiber-reinforced cement board in lightweight pressure relief wall according to claim 1, characterized in that: the self-tapping screw is a countersunk self-tapping screw, the countersunk self-tapping screw is arranged along the longitudinal and transverse directions of the fiber-reinforced cement board, and the spacing between adjacent self-tapping screws is 200mm.

[0021] Furthermore, in the step of filling the joint with flexible sealant, the flexible sealant is selected according to the design pressure relief value requirements of the lightweight pressure relief wall, so that the flexible sealant layer can absorb the joint deformation caused by the drying shrinkage and thermal expansion of the fiber-reinforced cement board, and avoid the formation of a rigid mortar filling layer at the joint.

[0022] Furthermore, both the frame columns and the frame beams are formed by casting C35 concrete, and the brick-built retaining wall is formed by laying solid concrete bricks.

[0023] Furthermore, after the alkali-resistant fiberglass mesh is pressed into the putty layer, it forms an exterior facade joint reinforcement layer together with the flexible joint filler layer. The exterior facade joint reinforcement layer is used to disperse external forces at the joint and protect the surface layer located at the joint.

[0024] Beneficial effects

[0025] This invention fills the joints of fiber-reinforced cement boards with a flexible sealant, which can absorb or buffer the joint deformation stress caused by the drying shrinkage and thermal expansion of the boards, thereby reducing the risk of cracking in the joints.

[0026] This invention uses water-resistant flexible putty, fire-resistant elastic sealant or silicone weather-resistant adhesive to form a flexible joint filling layer, which can improve the waterproof sealing performance of the joints and reduce the risk of rainwater entering the interior of the wall through the board joints.

[0027] This invention avoids the formation of traditional crack-resistant cement mortar or rigid waterproof mortar filling layers at the joints between panels, thereby reducing the adverse effects of sudden changes in local stiffness at the joints on the pressure relief function and making it easier for the lightweight pressure relief wall to achieve cracking or detachment pressure relief according to the design pressure relief value requirements.

[0028] This invention involves pressing alkali-resistant fiberglass mesh into the joints of exterior facade panels, allowing the fiberglass mesh to cross the joints and cover the edges of the panels on both sides of the joints. This connects scattered panel joints into a whole, improving the flatness of the wall surface and the crack resistance of the joints.

[0029] The fiberglass mesh reinforcement layer of the present invention can disperse external impact, reduce the risk of direct force damage to the edges and joints of fiber-reinforced cement boards, and help protect the exterior putty layer and anti-corrosion coating.

[0030] The construction steps of this invention are clear, and the Q235 galvanized square tube, U-shaped steel, fiber-reinforced cement board, flexible joint filler and alkali-resistant fiberglass mesh used are all readily available, making it suitable for widespread application in the construction of lightweight pressure relief walls in industrial buildings such as chemical and petrochemical plants. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of a lightweight pressure relief wall frame, board, and flexible filling structure for the board joints in one embodiment of the present invention.

[0032] Figure 2 This is a schematic diagram of the structure of the exterior facade panel after alkali-resistant fiberglass mesh is applied in one embodiment of the present invention.

[0033] Figure 3 This is a schematic diagram of the arrangement of fiber-reinforced cement board, self-tapping screws and alkali-resistant fiberglass mesh in one embodiment of the present invention.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Frame columns; 2. Q235 galvanized square tubes; 3. U-shaped steel; 4. Expansion bolts; 5. Fiber-reinforced cement board; 6. Water-resistant flexible putty; 7. Fiberglass mesh; 8. Frame beams; 9. Self-tapping screws; 10. Brick retaining walls. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0037] As shown in the figure, this embodiment provides a construction method for improving the joint quality of fiber-reinforced cement board lightweight pressure relief walls. This construction method is used for the construction of lightweight pressure relief walls in industrial buildings, and is particularly suitable for the construction of lightweight pressure relief walls in buildings with flammable and explosive risks, such as chemical, petrochemical, combustible gas, steam, dust, or hazardous material storage facilities.

[0038] The lightweight pressure relief wall in this embodiment includes frame columns 1, Q235 galvanized square tubes 2, U-shaped steel 3, expansion bolts 4, fiber-reinforced cement board 5, water-resistant flexible putty 6, fiberglass mesh 7, frame beams 8, self-tapping screws 9, and a brick retaining wall 10. Frame columns 1 and frame beams 8 are formed by casting C35 concrete, and the brick retaining wall 10 is formed by laying solid concrete bricks.

[0039] Q235 galvanized square tubing 2 serves as the main keel, with a preferred specification of 100 mm × 50 mm × 3.0 mm. U-shaped steel 3 serves as the secondary keel, with a preferred specification of 100 mm × 40 mm × 0.6 mm. Expansion bolts 4 are preferably M12 expansion bolts. Fiber-reinforced cement board 5 has a preferred specification of 2440 mm × 1220 mm × 10 mm. Self-tapping screws 9 are preferably countersunk self-drilling screws. Fiberglass mesh 7 is preferably alkali-resistant fiberglass mesh.

[0040] The construction method in this embodiment includes the following steps:

[0041] Step 1: Material Inspection. Inspect the specifications and models of the following materials on site: fiber-reinforced cement board 5, Q235 galvanized square tube 2, U-shaped steel 3, expansion bolts 4, self-tapping screws 9, water-resistant flexible putty 6, and fiberglass mesh 7, to confirm that the materials meet the requirements of the detailed design.

[0042] Step 2: Installation of main and secondary keels. After the frame column 1 and frame beam 8 are poured and the formwork is removed, according to the detailed design requirements, Q235 galvanized square tubes 2 are arranged longitudinally and transversely along the frame column 1 as main keels; U-shaped steel 3 are arranged along the positions of frame column 1, frame beam 8 and brick-built upstand 10 as secondary keels.

[0043] Step 3: Installation of expansion bolts. After the main and secondary keels are arranged, M12 expansion bolts 4 are evenly distributed at 800 mm intervals along the secondary keel positions to stably fix the secondary keels in their respective structural positions. After the expansion bolts 4 are installed, the expansion bolts 4 and the corresponding connection parts are treated with anti-corrosion measures, such as by brushing on anti-corrosion paint.

[0044] Step 4: Installation of Fiber Reinforced Cement Boards. Use self-tapping screws 9 to fix the fiber reinforced cement boards 5 to the Q235 galvanized square tube 2 and U-shaped steel 3. The self-tapping screws 9 are arranged along the longitudinal and transverse directions of the fiber reinforced cement boards 5, preferably with a spacing of 200 mm between adjacent screws 9. After installation, a joint is formed between adjacent fiber reinforced cement boards 5.

[0045] Step 5, Flexible Joint Filling. After the fiber-reinforced cement board 5 is installed, water-resistant flexible putty 6 is filled into the joints of adjacent fiber-reinforced cement boards 5 to form a flexible joint filler layer. This flexible joint filler layer can offset or buffer the joint deformation stress caused by the drying shrinkage and thermal expansion of the fiber-reinforced cement board 5, thereby reducing the risk of putty layer cracking and rainwater leakage at the joints.

[0046] In other embodiments, depending on the design pressure relief requirements of the lightweight pressure relief wall, the joint filler material can be replaced with a low-strength, flexible, or elastic sealant such as a special fire-resistant elastic sealant or a silicone weather-resistant sealant. By selecting such a flexible filler material, a rigid mortar filling layer can be avoided at the joints of the fiber-reinforced cement board 5, thereby reducing the adverse effects of increased local stiffness of the joints on the pressure relief capacity.

[0047] Step Six: Pressing in the Fiberglass Mesh. After the water-resistant flexible putty 6 is filled, before it cures, press the fiberglass mesh 7 into the putty layer at the joint of the exterior facade panels, so that the fiberglass mesh 7 spans the joint and covers the edges of the fiber-reinforced cement board 5 on both sides of the joint. After being pressed in, the fiberglass mesh 7, together with the exterior facade putty layer, forms a fiberglass mesh reinforcement layer.

[0048] With the above settings, the flexible joint filler layer at the joint can play a role in preventing cracking and seepage, while maintaining the pressure relief capacity of the lightweight pressure relief wall under the action of explosive overpressure; the fiberglass mesh reinforcement layer can connect the joint area of ​​adjacent fiber reinforced cement boards 5 into a whole, improve the strength and flatness of the exterior facade, disperse the impact of external forces, and reduce the non-explosive damage rate at the joint and the edge of the board.

[0049] In this embodiment, the flexible joint filler layer and the fiberglass mesh reinforcement layer together constitute the joint structure of the fiber-reinforced cement board in the lightweight pressure relief wall. The flexible joint filler layer is located between adjacent fiber-reinforced cement boards 5, and the fiberglass mesh reinforcement layer is located on the exterior facade and spans the flexible joint filler layer. This joint structure differs from the traditional rigid crack-resistant mortar sealing method, and can improve the joint quality while maintaining the pressure relief function of the lightweight pressure relief wall.

[0050] This invention is not limited to the above embodiments. For example, the specifications of the main keel, secondary keel, and fiber-reinforced cement board 5 can be adjusted according to engineering design requirements; the spacing of the expansion bolts 4 and self-tapping screws 9 can be adjusted according to the wall height, board size, and stress requirements; the flexible joint filler material can be selected according to waterproofing, fireproofing, weather resistance, and design pressure relief requirements. As long as a flexible joint filler layer is used in conjunction with an alkali-resistant fiberglass mesh reinforcement layer installed across the joints to improve the joint quality of the fiber-reinforced cement board in the lightweight pressure relief wall and avoid the rigid joint filler layer from weakening the pressure relief function, it should fall within the protection scope of this invention.

Claims

1. A construction method for improving the joint quality of fiber-reinforced cement board in lightweight pressure-relief walls, characterized in that, Includes the following steps: After the frame columns and frame beams are constructed, longitudinal and transverse main joists are arranged along the frame columns, and secondary joists are arranged along the frame columns, frame beams and brick masonry curbs. The secondary keel is fixed with expansion bolts to form a lightweight pressure relief wall keel system for installing fiber-reinforced cement boards; Multiple fiber-reinforced cement boards are fixed to the main keel and the secondary keel with self-tapping screws to form a joint between adjacent fiber-reinforced cement boards. The joint is filled with a flexible sealant to form a flexible sealant layer between adjacent fiber-reinforced cement boards. The flexible sealant is a water-resistant flexible putty, a fire-retardant elastic sealant, or a silicone weather-resistant sealant. Before the flexible joint filler material cures, alkali-resistant fiberglass mesh is pressed into the putty layer at the joint of the exterior facade panels, so that the alkali-resistant fiberglass mesh spans the joint and covers the edges of the fiber-reinforced cement board on both sides of the joint.

2. The construction method for improving the joint quality of fiber-reinforced cement board in lightweight pressure-relief walls according to claim 1, characterized in that: The main keel is made of Q235 galvanized square tubing, and the specifications of the Q235 galvanized square tubing are 100mm×50mm×3.0mm.

3. The construction method for improving the joint quality of fiber-reinforced cement board in lightweight pressure-relief walls according to claim 1, characterized in that: The secondary keel is a U-shaped steel with dimensions of 100mm × 40mm × 0.6mm.

4. The construction method for improving the joint quality of fiber-reinforced cement board in lightweight pressure-relief walls according to claim 1, characterized in that: The expansion bolts are M12 expansion bolts, and the M12 expansion bolts are arranged at 800 mm intervals along the secondary keel; After the expansion bolts are installed, anti-corrosion treatment is applied to the expansion bolts and their corresponding connection locations.

5. The construction method for improving the joint quality of fiber-reinforced cement board in lightweight pressure-relief walls according to claim 1, characterized in that: The fiber-reinforced cement board has dimensions of 2440mm × 1220mm × 10mm.

6. The construction method for improving the joint quality of fiber-reinforced cement board in lightweight pressure-relief walls according to claim 1, characterized in that: The self-tapping screws are countersunk self-tapping screws, which are arranged along the longitudinal and transverse directions of the fiber-reinforced cement board, and the spacing between adjacent self-tapping screws is 200mm.

7. The construction method for improving the joint quality of fiber-reinforced cement board in lightweight pressure-relief walls according to claim 1, characterized in that: In the step of filling the joint with flexible sealant, the flexible sealant is selected according to the design pressure relief value requirements of the lightweight pressure relief wall, so that the flexible sealant layer can absorb the joint deformation caused by the drying shrinkage and thermal expansion of the fiber-reinforced cement board, and avoid the formation of a rigid mortar filling layer at the joint.

8. A construction method for improving the joint quality of fiber-reinforced cement board in lightweight pressure-relief walls according to claim 1, characterized in that: The frame columns and frame beams are all formed by C35 concrete casting, and the brick masonry retaining wall is formed by solid concrete brick masonry.

9. A construction method for improving the joint quality of fiber-reinforced cement board in lightweight pressure-relief walls according to claim 1, characterized in that: After the alkali-resistant fiberglass mesh is pressed into the putty layer, it together with the flexible joint filler layer to form an exterior joint reinforcement layer. The exterior joint reinforcement layer is used to disperse external forces at the joint and protect the surface layer located at the joint.

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