Industrial building terrace construction method
By using technical means such as polyethylene waterproof plastic film layer, synthetic resin pipe and isolation joints in the construction of industrial building floors, the problems of poor construction performance, poor durability and poor crack control effects in the existing construction methods are solved, and the effects of higher quality, faster construction speed and lower crack incidence are achieved.
Patent Information
- Application Number
- CN202411800363.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-09
- Publication Date
- 2025-03-04
AI Technical Summary
The existing industrial building floor construction methods have problems such as poor construction performance, insufficient thickness of the steel bar protective layer, long construction period and poor crack control effect.
An industrial building floor construction method is adopted, including laying a polyethylene waterproof plastic film layer on the lean concrete cushion layer and bundling concrete surface steel bars on it. The synthetic resin tube is installed at the preset cutting joint position, and the isolation joint is formed at the connection between the floor and the structural plate or column. After the concrete is hardened, fill it with plastic and foam and waterproof sealant, and fill it with cement mortar in the cutting joints.
This method effectively reduces cracks, improves the quality and durability of the floor, shortens the construction cycle, and avoids slow construction speed caused by sub-warehouse pouring.
Smart Images
Figure CN119553834A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to an industrial building floor construction method, in particular to an industrial building floor construction method that reduces the occurrence of cracks, and belongs to the technical field of concrete crack control. Background Art
[0002] Building floor is widely used as the first floor of a building. It is separated from the main structure and directly imports the floor load into the foundation, thereby reducing the foundation cost and increasing the overall construction speed. However, since the building floor is a large-area thin plate structure and is not constrained by the main structural components such as beams and foundations, it is easy to crack over time due to factors such as temperature changes, thermal expansion and contraction, creep, and fatigue under the load of reciprocating forklifts during the use stage.
[0003] In the prior art, the traditional method for preventing floor cracks adopts the method in the building floor design specification GB50037-2013. The contraction joints are set vertically and the casting is carried out in separate compartments, and the cutting joints are set horizontally, so that the cracks are concentrated on these contraction joints and cutting joints to control the development of cracks.
[0004] Longitudinal contraction joints are usually flat joints or tongue-and-groove joints, with a spacing of 3-6m. When tongue-and-groove joints are used, the thickness of the concrete cushion layer should not be less than 150mm. Transverse contraction joints are cut joints, also known as false joints, with a width of 5-12mm, a spacing of 6-12m, and a height that is preferably 1 / 3 of the cushion layer thickness. The joints are filled with cement mortar.
[0005] The above-mentioned method of prior art has the following disadvantages:
[0006] 1) Poor construction performance and difficult to control quality. The depth of the transverse cutting seam is uniformly 1 / 3 of the thickness of the reinforced concrete surface layer (h). For civil buildings, the load is small, the bottom plate thickness is usually less than 150mm, 1 / 3h is relatively small, and cutting is relatively convenient. However, the ground load of industrial buildings is large. As the thickness h of the concrete surface layer increases, the cutting depth deepens and the construction difficulty increases. For example, when the thickness h is 300mm, 1 / 3h must be cut 100mm, which is difficult to cut, and because the cutting seam is too deep, early cutting is prone to collapse.
[0007] 2) The thickness of the steel bar protective layer is not enough and the durability is poor. The ground load of industrial buildings is large, and double reinforcement is usually used in the reinforced concrete surface layer. The cement mortar used as the filler of the cutting seam is filled later and cannot provide effective protection for the steel bar. If the cutting seam is unified as 1 / 3h, the thickness of the reinforced concrete protective layer will be less than the relevant regulations on durability, and it may even directly cut the steel bar, which is easy to rust and affect the bearing capacity of the floor.
[0008] 3) Long construction period. Because the longitudinal shrinkage joints are cast in compartments, each compartment needs to be basically hardened before casting, which prolongs the construction time.
[0009] 4) The spacing between transverse cutting seams is 6-12m, which is too sparse. Past projects have found that cracks still often occur between the cutting seams, and the crack control effect is poor. Summary of the invention
[0010] The present invention provides an industrial building floor construction method, which aims to overcome the above-mentioned deficiencies in the prior art, achieve effective reduction of crack occurrence, and facilitate and speed up construction.
[0011] The technical solution of the present invention is a method for constructing an industrial building floor, comprising the following steps:
[0012] 1) First, a lean concrete cushion is constructed, and then a polyethylene waterproof plastic film layer is laid on the lean concrete cushion, concrete surface steel bars are tied on the polyethylene waterproof plastic film layer, and synthetic resin pipes are set up at corresponding positions of the preset cutting seams, and the synthetic resin pipes are fixed to the concrete surface steel bars with iron wires;
[0013] 2) An isolation joint is formed at the connection between the floor and the structural slab or column, wall and equipment foundation. The isolation joint is formed by wrapping the formwork with a plastic film. After the concrete of the reinforced concrete surface layer is poured and hardened, the formwork is removed to form the isolation joint;
[0014] 3) Pour concrete to form a reinforced concrete surface layer and set construction joints according to construction needs;
[0015] 4) Construction of cutting seams on reinforced concrete surface layer;
[0016] 5) After the reinforced concrete surface layer is completely hardened, the isolation joint is processed, the template in the isolation joint is removed, and then plastic filling foam is first stuffed, and then waterproof sealant is applied;
[0017] 6) Fill the cutting seams with cement mortar.
[0018] Preferably, before performing the step 1), the foundation treatment under the floor is performed first to ensure the bearing capacity and anti-settling ability of the foundation itself; specifically, for foundations of soft clay, backfill soil, and planting soil, the Panax notoginseng powder mixing reinforcement method is adopted; for foundations of sandy soil, the compaction and densification reinforcement method is adopted; when the foundation needs to be backfilled, graded sand is used for layered compaction, with each layer not exceeding 30 cm and a compaction coefficient of not less than 0.94, and the rolling surface of each layer is ensured to be flat, and the rolling is first performed around the foundation and columns.
[0019] Preferably, before carrying out the step 1), the ground under the floor is treated and the construction of the foundation, columns, walls and equipment foundation is completed.
[0020] Preferably, in step 2), a dowel is installed at the connection between the floor and the structural plate, and the dowel is subjected to a non-bonding treatment on one side of the floor, and the non-bonding treatment includes wrapping with a plastic film or coating with epoxy resin. This can ensure the flatness of the connection with the structural plate, avoid the transmission of internal forces, and control the occurrence of ground height differences.
[0021] Preferably, in the step 2), anti-crack steel bars are installed around the columns.
[0022] Preferably, the diameter of the resin tube is The depth of the cutting seam is D, the thickness of the reinforced concrete surface layer is h,
[0023] Preferably, the cutting seam is 20-30 mm deep, 3-5 mm wide, and ≤4 m apart. The cutting seam stops when it encounters an isolation seam or a construction seam, and continues to extend downward when it encounters another cutting seam, thereby avoiding the formation of a T-shaped intersection and cracks at the T-shaped intersection.
[0024] Preferably, the width of the isolation seam is ≥10 mm.
[0025] Preferably, the dowel bars are arranged every 0.5 m, with a length of 500 mm and 250 mm on each side, to prevent uneven settlement from causing height differences and ensure the flatness of the ground at the connection.
[0026] The advantages of the present invention are: the method is reasonably designed, cutting is convenient, cracks can be reduced, and floor quality can be improved. At the same time, it avoids the use of compartment casting and improves construction speed. Specifically,
[0027] (1) The cutting seam is easy to cut and the construction period is short. The combination of CD tube and cutting seam is used to ensure a 33% defect rate, and the cutting seam depth is controlled at 20-30mm. It is easy to construct, has low cutting difficulty, and fast construction speed.
[0028] (2) Good durability. The cutting seam is controlled within 30mm. When single-layer reinforcement is used, the thickness of the reinforced concrete protective layer can be effectively guaranteed. When double-layer reinforcement is used, the upper reinforcement is cut off, and the horizontal distance between the end of the reinforcement and the cutting seam is more than 30mm to ensure the thickness of the reinforcement protective layer. This can effectively improve the durability of the concrete surface layer.
[0029] (3) No compartment casting, fast construction speed. By increasing the spacing of the cutting seams, compartment casting can be avoided and the construction speed can be increased.
[0030] (4) The ground is highly flat. The floor and the structural slab are connected by non-bonded reinforcement, so that there is no height difference at the connection between the two.
[0031] (5) Fewer cracks around columns and equipment foundations. By connecting the isolation seams at the corners of the equipment foundations near the columns with the isolation seams at the corners of the columns, cracks in the equipment foundations that are complex and prone to cracks can be concentrated at the cut seams, thereby reducing the occurrence of ground cracks near the equipment foundations. Anti-crack steel bars are added to the corners of the columns to prevent cracks around the columns. BRIEF DESCRIPTION OF THE DRAWINGS
[0032] Figure 1 It is a cross-sectional view of a building floor according to an embodiment of the industrial building floor construction method of the present invention.
[0033] Figure 2 It is a cross-sectional view of a building floor in another embodiment of the industrial building floor construction method of the present invention.
[0034] Figure 3 It is a cross-sectional view of the connection between the floor, columns and walls in the industrial building floor construction method of the present invention.
[0035] Figure 4 It is a cross-sectional view of the connection between the floor and the structural plate in the industrial building floor construction method of the present invention.
[0036] Figure 5 It is a cross-sectional view of a construction joint of the industrial building floor construction method of the present invention.
[0037] Figure 6 It is a typical setting plan of cutting seams in the industrial building floor construction method of the present invention.
[0038] Figure 7 It is a plan view of the reinforcement bars for preventing cracks on the edge of columns of an industrial building floor construction method according to the present invention.
[0039] In the figure, 1 is the lean concrete cushion layer, 2 is the polyethylene waterproof plastic film layer, 3 is the reinforced concrete surface layer, 4 is the cutting seam, 5 is the concrete surface layer steel bar, 6 is the synthetic resin pipe (CD pipe), 7 is the isolation seam, 8 is the plastic filling foam, 9 is the waterproof sealant, 10 is the structural plate, 11 is the inserted steel bar, 12 is the construction joint, and 13 is the anti-cracking steel bar. DETAILED DESCRIPTION
[0040] The present invention is further described in detail below with reference to examples and specific implementation modes.
[0041] like Figure 1-7 As shown, a method for constructing an industrial building floor comprises the following steps:
[0042] 1) Before floor construction, the foundation under the floor should be treated to ensure the bearing capacity and anti-settlement ability of the foundation itself.
[0043] Specifically, for foundations that were originally soft clay, backfill soil, or planting soil, use Panax notoginseng powder mixing reinforcement. For sandy soil, use compaction and compaction reinforcement. When the foundation needs to be backfilled, use graded sandy soil to compact in layers, with each layer not exceeding 30cm and a compaction coefficient of not less than 0.94. Try to ensure that the rolling surface of each layer is flat, and first roll around the foundation and columns.
[0044] 2) Before floor construction, complete the construction of foundation, columns, walls and equipment foundation.
[0045] 3) First, construct the lean concrete cushion layer 1, then lay the polyethylene waterproof plastic film layer 2 on the lean concrete cushion layer 1, tie the concrete surface steel bars 5 on the polyethylene waterproof plastic film layer 2, and set up the synthetic resin pipe 6 at the corresponding position of the preset cutting seam 4. The synthetic resin pipe 6 is fixed to the concrete surface steel bars 5 with iron wire to prevent disturbance during concrete pouring.
[0046] 4) An isolation joint 7 is formed at the connection between the floor and the structural plate 10 or the column, wall and equipment foundation by wrapping the template with a plastic film. After the concrete of the reinforced concrete surface layer 3 is poured and hardened, the template is removed to form the isolation joint 7.
[0047] The dowel rod 11 is installed at the connection between the floor and the structural plate 10. The dowel rod 11 is treated with a non-bonding method on one side of the floor, such as wrapping with a plastic film or coating with epoxy resin.
[0048] Install anti-crack steel bars 13 around the perimeter of the column.
[0049] 5) Pour concrete to form a reinforced concrete surface layer 3, and set construction joints 12 according to construction needs.
[0050] If the concrete pouring is in summer, strong wind or strong sunlight, a temporary roof should be erected (usually the second floor can also serve as a temporary roof) to prevent the concrete surface from drying out quickly. When pouring concrete, use a vibrator to make the concrete dense. After the concrete is poured, in order to prevent plastic shrinkage cracks on the concrete surface, once it hardens to the point where people can walk on it, it should be immediately moistened and cured. It can be cured by sprinkling water or covering with plastic film. In particular, special attention should be paid to the rapid drying of concrete in summer.
[0051] 6) Construction of cutting seams 4 is performed on the reinforced concrete surface layer 3 .
[0052] There are two periods to choose from: one is when the concrete is in the initial hardening stage and is just walkable, which is the soft-cut method (SOFT-CUT); the other is when the concrete is completely hardened and water is used for cutting, which is the hard-cut method (HARD-CUT). The approximate dates for the two cutting methods can be referred to Table 1. The concrete surface must be kept moist for three days before hard cutting, and the method of sprinkling water + film curing should be used to keep it moist.
[0053] Table 1 Recommended date for cutting (days)
[0054] No Cutting method summer Spring and Autumn winter 1 Soft Cutting 0.5 1 1-1.5 2 Hard cutting 3 4 5
[0055] 7) After the reinforced concrete surface layer 3 is completely hardened, the isolation joint 7 is processed, the template in the isolation joint 7 is taken out, and then plastic filling foam 8 is first stuffed into it, and then waterproof sealant 9 is applied.
[0056] 8) Fill the cut seam 4 with cement mortar.
[0057] It can be postponed as far as possible according to the construction period. In this way, the concrete can be completely hardened, and the filling cement mortar will not become one with the concrete and work independently.
[0058] During the specific construction,
[0059] 1. The synthetic resin tube 6 and the cutting seam 4 are combined to ensure the same 1 / 3h section defect rate as the traditional method, so that the cracks are concentrated at the cutting seam 4, such as Figure 1 The cutting seam 4 has a depth of 20-30 mm and a width of 3-5 mm; the cutting seam 4 is filled with cement mortar after the concrete hardens.
[0060] Assuming that the diameter of the synthetic resin pipe 6 is φ, the depth of the cutting seam 4 is D, and the thickness of the reinforced concrete surface layer 3 is h, the defect rate = (φ+D) / h≧33% can meet the defect rate requirement.
[0061] The synthetic resin pipe 6 is used to ensure the defect rate of the cutting seam 4. Compared with the conventional cutting seam in the prior art, which needs to reach a cross-sectional defect rate of 33%, when the ground load is large and the concrete surface layer is thick (such as 300mm), it becomes difficult to cut 1 / 3 of the depth, and the problem of cutting the stressed steel bars may occur. The method of pre-embedded synthetic resin pipe 6 can effectively ensure the cross-sectional defect rate and reduce the depth of the cutting seam, thereby reducing the difficulty of construction.
[0062] Since the cutting seam is controlled at 20-30mm, the thickness of the reinforced concrete protective layer can be effectively guaranteed when single-layer reinforcement is used, thereby increasing the durability of the reinforced concrete surface layer.
[0063] 2. When the floor load of industrial buildings is large, the reinforced concrete surface layer 3 is thick, and double-layer reinforcement (concrete surface layer reinforcement 5) is used, the reinforcement and cutting seams are as follows: Figure 2 As shown. The upper reinforcement is completely cut off, and the horizontal distance between the reinforcement end and the cutting seam 4 is more than 30mm. The lower reinforcement remains continuous, and the reinforced concrete surface layer 3 between each cutting seam 4 is an independent load-bearing plate, and the lower reinforcement only plays a connecting role. The size of the synthetic resin pipe 6 must also meet the defect rate (φ+D) / h≧33% requirement.
[0064] When double-layer reinforcement is used, the upper reinforcement is cut off and the horizontal distance between the end of the reinforcement and the cutting seam is more than 30 mm, which can ensure the thickness of the reinforcement protection layer and also increase the durability of the reinforced concrete surface layer.
[0065] 3. How are the floor and columns, walls, and equipment foundations connected? Figure 3 As shown. The floor and the column are isolated from the structure by an isolation joint 7 to prevent the internal force from being transmitted. The width of the isolation joint 7 is greater than or equal to 10 mm, the inner surface is filled with plastic foam 8, and the outer surface is sealed with waterproof sealant 9.
[0066] 4. The connection between the floor and the structural plate 10 is as follows Figure 4 As shown. The building floor is separated from the structural plate 10 by the isolation joint 7 to prevent the internal forces from being transmitted to each other. At the same time, the two sides are connected by the dowel bar 11 to prevent the height difference caused by uneven settlement and ensure the flatness of the ground at the connection. The dowel bar 11 is set every 0.5m, with a length of about 500mm and about 250mm on both sides. It is located on one side of the building floor and is non-bonded to release friction and prevent the transmission of internal forces. The non-bonding treatment can be achieved by wrapping the steel bars with plastic film or applying epoxy resin.
[0067] The unbonded dowel 11 can ensure the flatness of the connection with the structural plate 10. Since the structural plate 10 and the building floor are subjected to different forces, they must be separated by an isolation joint 7. However, the different settlements of the two can easily lead to a height difference of the ground at the isolation joint 7, affecting the flatness of the ground. By connecting the two by using the unbonded dowel 11, the internal force transmission can be avoided while controlling the height difference of the ground.
[0068] 5. Typical distribution of cutting seams 4 is as follows Figure 6 As shown. The basic design principle of the cutting seam 4 is: the spacing of the cutting seam 4 is ≤ 4m, and it can be stopped when encountering the isolation seam 7 and the construction seam 12. When encountering the cutting seam 4, it must continue to extend downward to avoid forming a T-shaped intersection and avoid cracks at the T-shaped intersection; when the corner point of the isolation seam 7 of the equipment foundation is close to the isolation seam 7 of the column, an oblique cutting seam is set to pull the two isolation seams 7 through to avoid cracks at the stress concentration corners. In addition, stress concentration is also prone to cracks at the four corners of the column, and oblique anti-crack steel bars 13 must be laid, such as Figure 7As shown. The anti-crack steel bar 13 can be made of 3 HRB400 diameter 12 ribbed steel bars, and also a welded steel mesh φ6@50. The anti-crack steel bar 13 can be installed above the concrete surface steel bar 5. The construction joint 12 does not need to be set every 3-6m according to the traditional method, but can be set arbitrarily according to the construction requirements to increase the construction speed. The construction joint is a conventional construction method, such as Figure 5 shown.
[0069] The spacing of the 4 cutting seams is ≤4m, and the spacing of the 4 cutting seams is increased to avoid compartment casting. Although compartment casting can reduce the occurrence of cracks, the construction speed is slow and there will be too many construction seams, which will affect the flatness after casting. Enlarging the spacing of the 4 cutting seams can effectively guide the cracks to occur at the cutting seams, avoid compartment casting, and increase the construction speed.
[0070] The above is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the present invention, which all belong to the protection scope of the present invention.
Claims
1. A method for construction of industrial building floor, characterized in that: The following steps are involved: 1) first constructing a lean concrete cushion layer (1), then laying a polyethylene waterproof plastic film layer (2) on the lean concrete cushion layer (1), tying concrete surface layer steel bars (5) on the polyethylene waterproof plastic film layer (2), erecting a synthetic resin pipe (6) at a corresponding position of a preset cutting seam (4), and fixing the synthetic resin pipe (6) on the concrete surface layer steel bars (5) with iron wire; 2) forming an isolation joint (7) at the connection between the floor and the structural plate (10) or the column, wall and equipment foundation. The isolation joint (7) is formed by wrapping the template with a plastic film. After the concrete of the reinforced concrete surface layer (3) is poured and hardened, the template is removed to form the isolation joint (7); 3) pouring concrete to form a reinforced concrete surface layer (3), and setting construction joints (12) according to construction needs; 4) constructing a cutting seam (4) on the reinforced concrete surface layer (3); 5) After the concrete of the reinforced concrete surface layer (3) is completely hardened, the isolation joint (7) is processed, the template in the isolation joint (7) is removed, and then the plastic filling foam (8) is first stuffed into the isolation joint, and then the waterproof sealant (9) is applied; 6) Fill the cut seam (4) with cement mortar.
2. An industrial building floor construction method as claimed in claim 1, characterized in that: Before carrying out the above-mentioned step 1), the foundation under the floor is treated first to ensure the bearing capacity and anti-settlement ability of the foundation itself; specifically, for foundations of soft clay, backfill soil, and planting soil, the Panax notoginseng powder mixing reinforcement method is adopted; for foundations of sandy soil, the compaction and densification reinforcement method is adopted; when the foundation needs to be backfilled, graded sand is used for layered compaction, with each layer not exceeding 30cm and a compaction coefficient of not less than 0.94, and the rolling surface of each layer is ensured to be flat, and the foundation and the periphery of the column are first compacted.
3. An industrial building floor construction method as claimed in claim 2, characterized in that: Before carrying out the above step 1), the ground under the floor is treated and the construction of the foundation, columns, walls and equipment foundation is completed.
4. The method for constructing an industrial building floor as claimed in claim 1, characterized in that: In the step 2), the dowel bar (11) is installed at the connection between the floor and the structural plate (10), and the dowel bar (11) is subjected to a non-bonding treatment on one side of the floor. The non-bonding treatment includes wrapping with a plastic film or coating with epoxy resin.
5. The method for constructing an industrial building floor as claimed in claim 1, characterized in that: In the step 2), anti-crack steel bars (13) are installed around the column.
6. The method for constructing an industrial building floor as claimed in claim 1, characterized in that The diameter of the resin pipe (6) is φ, the depth of the cutting seam (4) is D, the thickness of the reinforced concrete surface layer (3) is h, and the defect rate = (φ+D) / h≧33%.
7. The method for constructing an industrial building floor as claimed in claim 1, characterized in that: The cutting seam (4) has a depth of 20-30 mm, a width of 3-5 mm, and a spacing of ≤4 m. The cutting seam (4) terminates when encountering an isolation seam (7) or a construction seam (12), and continues to extend downward when encountering another cutting seam (4).
8. The method for constructing an industrial building floor as claimed in claim 1, characterized in that: The width of the isolation seam (7) is ≥10 mm.
9. The method for constructing an industrial building floor as claimed in claim 1, characterized in that: The dowel bars (11) are arranged at intervals of 0.5 m, with a length of 500 mm and 250 mm on each side.