Upturning type construction joint treatment method for impervious reinforced concrete floor

Abstract

The invention discloses an upturning type construction joint treatment method for an impervious reinforced concrete floor, which comprises the following steps: pouring floor concrete in a first area at a preset position, and forming a vertical joint surface of a construction joint and a slope joint surface positioned on the upper surface of the first area; after the concrete in the first area reaches the preset strength, chiseling, cleaning and wetting the vertical joint face and the slope joint face of the construction joint; floor slab concrete is poured in a second area adjacent to the first area, an upturning covering structure is integrally poured over the vertical joint face, the upturning covering structure and the concrete in the second area are of a one-time overall pouring structure, and a part of the upturning covering structure extends and covers the top face of the first area; therefore, the vertical joint surface of the construction joint is completely covered. By optimizing the geometric structure of the construction joint, the mechanical property of the joint is remarkably enhanced, the problems that the joint is prone to leakage and not tight in connection are structurally solved, and the horizontal deformation resistance of the floor at the construction joint is further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to a method for treating construction joints of an upward turning type for anti-permeation reinforced concrete floors. BACKGROUND

[0002] In the construction of reinforced concrete floors, especially large-area floors (such as roof slabs), due to the limitations of pouring processes, construction joints must be set. The construction joint is the joint surface of new and old concrete and is also a weak link in the structure, which is prone to cracking, leakage and other common quality problems.

[0003] The existing conventional treatment method mainly focuses on "passive reinforcement". Usually, the construction joint is set in a region with small structural shear, such as the middle third of the span of the beam and slab. The quality of the vibrating work during pouring is particularly important in the region where the new and old concrete meet. The quality of the vibrating work affects the quality of the finished concrete product. Before pouring the later concrete, the hardened old concrete joint surface is chiseled to increase its surface roughness, then washed clean and kept wet. In order to further enhance the bonding performance and anti-permeation performance of the new and old concrete, some also apply an interface treatment agent, such as an epoxy resin adhesive or a cement-based crystalline waterproof coating, to the joint surface.

[0004] For the treatment of floor construction joints, the existing technical measures can indeed have a positive effect, but still have many shortcomings.

[0005] Complex process, dependent on manual work: the chiseling, cleaning and brushing of the interface agent are numerous procedures, which increase the construction steps and management difficulty. In particular, the brushing of the interface agent requires high technical level and responsibility of the construction personnel, and the timing, uniformity and thickness of the brushing directly affect the final result, and the quality control is unstable.

[0006] Increased cost: the use of chemical interface agents such as epoxy resin significantly increases the material and labor costs. The increase in the number of teams and types of materials on the construction site increases the management cost of the site.

[0007] Insufficient reliability: the interface agent itself is an organic material or a thin layer of coating, and its durability is not synchronized with the main concrete structure. Under the long-term effects of temperature difference, dry shrinkage and structural load, it may age and fail, resulting in a decrease in the bonding strength at the construction joint and a failure of the waterproofing, and the risk of leakage still exists. The upper surface of the traditional construction joint is flat, and a slight mistake can easily form a water accumulation area, aggravating the risk of water seepage.

[0008] Palliative rather than curative: the traditional method essentially "makes up" for an inherent structural weakness, without fundamentally changing the water flow path and stress transfer method from the design. The construction joint is still located in a weak area of the structure, which is prone to cracking when subjected to uneven deformation or temperature difference stress.

[0009] Therefore, there is an urgent need for a construction joint treatment method with reasonable structure, simple operation and good waterproof effect. SUMMARY

[0010] The main purpose of the present application is to provide an upward turning construction joint treatment method for impermeable reinforced concrete floor, aiming to solve the above technical problems.

[0011] To achieve the above purpose, the present application provides an upward turning construction joint treatment method for impermeable reinforced concrete floor, comprising:

[0012] Step one, pouring floor concrete in the predetermined position of the first area, and forming the vertical joint surface of the construction joint and the inclined joint surface on the upper surface of the first area;

[0013] Step two, after the concrete of the first area reaches the predetermined strength, roughen, clean and moisten the vertical joint surface and the inclined joint surface of the construction joint;

[0014] Step three, pouring floor concrete in the second area adjacent to the first area, and at the same time pouring an upward turning cover structure on the vertical joint surface, the upward turning cover structure is integrally poured with the concrete of the second area, and a part of the upward turning cover structure extends and covers the top surface of the first area, so that the vertical joint surface of the construction joint is completely covered.

[0015] In an embodiment, the cross-sectional shape of the upward turning cover structure is circular arc, trapezoidal or triangular.

[0016] In an embodiment, the top surface of the upward turning cover structure has a preset arc or slope to guide water to both sides of the construction joint.

[0017] In an embodiment, the radius R of the top surface of the upward turning cover structure is 200mm<R<600mm, and the slope of the top surface of the upward turning cover structure is between 10% and 60%.

[0018] In an embodiment, the slope of the inclined joint surface is 3% to 15%.

[0019] In an embodiment, the width of the upward turning cover structure is 100mm to 600mm, and the width of the top surface of the first area or the second area covered by the upward turning cover structure is 50mm to 300mm respectively.

[0020] In an embodiment, the highest point of the upward turning cover structure is 30mm to 120mm relative to the height of the upper surface of the first area and the second area.

[0021] In an embodiment, the upward turning cover structure is internally provided with additional connecting steel bars or steel mesh connecting the floor steel bars of the first area and the second area.

[0022] In one embodiment, a steel plate, rubber, or PVC waterstop is embedded at the vertical joint surface.

[0023] The technical solution of this invention includes a method for treating upward-turning construction joints in impermeable reinforced concrete floor slabs, comprising:

[0024] Step 1: Pour the floor slab concrete of the first area at the predetermined location to form the vertical joint surface of the construction joint and the sloping joint surface on the upper surface of the first area.

[0025] Step 2: After the concrete in the first area reaches the predetermined strength, roughen, clean, and moisten the vertical and sloping joint surfaces of the construction joint.

[0026] Step 3: Pour concrete for the floor slab in the second area adjacent to the first area. At the same time as pouring the second area, pour an upturned covering structure directly above the vertical joint surface. The upturned covering structure and the concrete of the second area are poured as a whole in one go, and part of it extends and covers the top surface of the first area, thereby completely covering the vertical joint surface of the construction joint.

[0027] This application significantly enhances the mechanical properties of construction joints by optimizing their geometric structure, structurally solving the problems of easy leakage and loose connection, and further improving the horizontal deformation resistance of the floor slab at the construction joint. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or 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 only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0029] Figure 1 This is a cross-sectional view of the construction joint according to an embodiment of the present invention;

[0030] Figure 2 This is a reinforcement diagram of the construction joint according to an embodiment of the present invention;

[0031] Figure 3 This is a structural schematic diagram of a specific embodiment of the present invention.

[0032] Attached drawings: 1. First area; 2. Second area; 3. Upward covering structure; 4. Vertical joint surface; 5. Sloping joint surface; 6. Bottom reinforcement of floor slab; 7. Top reinforcement of floor slab; 8. Arc-shaped reinforcement; 9. Reinforcement details.

[0033] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0035] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0036] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0037] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0038] This invention provides a method for treating upward-turning construction joints in impermeable reinforced concrete floor slabs.

[0039] like Figures 1-2 As shown in the embodiment of the present invention, the method for treating upward-turning construction joints in impermeable reinforced concrete floor slabs includes:

[0040] Step 1: Pour concrete for the floor slab of the first area 1 at the predetermined location, forming the vertical joint surface 4 of the construction joint and the sloping joint surface 5 located on the upper surface of the first area 1.

[0041] Step 2: After the concrete in the first area 1 reaches the predetermined strength, roughen, clean and moisten the vertical joint surface 4 and the sloping joint surface 5 of the construction joint.

[0042] Step 3: Pour the floor slab concrete of the second area 2 adjacent to the first area 1. While pouring the second area 2, integrally pour an upwardly turned covering structure 3 directly above the vertical joint surface 4. The upwardly turned covering structure 3 and the concrete of the second area 2 are of a one-time integral pouring structure, and a part of it extends and covers the top surface of the first area 1, thereby completely covering the vertical joint surface 4 of the construction joint.

[0043] In this embodiment, during the construction of the second area 2, it is integrally poured and formed with an upwardly turned covering structure 3 at one time. This upwardly turned covering structure 3 is not only integrated with the second area 2 but also overlaps above the top surface of the first area 1, forming a structure similar to a "lid", completely placing the linear vertical construction joint under its protection, and further improving the horizontal anti-deformation ability of the floor slab at the construction joint through the structural reinforcement 9.

[0044] Among them, the cross-sectional shape of the upwardly turned covering structure 3 is circular arc-shaped, trapezoidal or triangular. The top surface of the upwardly turned covering structure 3 is designed with a drainage slope. Its cross-section can be a smooth circular arc, triangle or trapezoid, which can quickly drain the accumulated water from the core area of the construction joint, and is beneficial to avoiding stress concentration. Physically, it extends the path of water penetrating from the floor surface to the joint surface of the construction joint, greatly improving the anti-seepage ability. At the same time, it increases the contact area and biting effect between the new and old concretes, and improves the shear force transfer ability and structural integrity at the construction joint.

[0045] Furthermore, the top surface of the upwardly turned covering structure 3 has a preset radian or slope to guide the water to both sides of the construction joint. At the same time, it can prevent water from flowing into the vertical construction joint from the joint between the first area 1 and the upward turn, and at the same time guide the water that may break through the waterproof protection of the upwardly turned covering structure 3 away from the core area of the construction joint.

[0046] Optionally, the radius of the radian R of the top surface of the upwardly turned covering structure 3 is 200mm < R < 600mm, the slope of the top surface of the upwardly turned covering structure 3 is between 10% and 60%, and the slope of the slope joint surface 5 is between 3% and 15%.

[0047] In this embodiment, the circular arc design at the top of the upwardly turned covering structure 3 changes the micro-topography at the construction joint, making it change from the traditional flat or low-lying to a local high point, which can effectively avoid water accumulation and eliminate the hydrostatic pressure, reducing the leakage risk from the source. Even in extreme cases where water penetrates, the water flow must bypass the overlapping part of the upwardly turned covering structure 3 to reach the vertical construction joint, and its leakage path is significantly extended (from the original direct vertical leakage to an "Ω" - shaped path). According to Darcy's law, the seepage resistance increases significantly, and the waterproof ability is improved geometrically.

[0048] The upturned cover structure 3 is equivalent to adding a small reinforcing rib at the weak construction joint. It increases the overlap area and mechanical interlocking force of the new and old concrete, which can more effectively transfer the stress between the floor slabs and resist uneven settlement or deformation caused by temperature difference, concrete shrinkage or load, thereby significantly reducing the risk of cracking and leakage at the construction joint.

[0049] Meanwhile, this application eliminates the need for applying epoxy resin interface agents or cement-based waterproof coatings by adding a small amount of concrete. This not only saves on expensive chemical building materials but also reduces labor costs, lowers reliance on the professional skills of construction workers, and avoids potential quality issues caused by improper application of interface agents due to dense reinforcement. Reducing the number of steps shortens the construction cycle and helps accelerate the overall project progress.

[0050] Please refer to Figure 3 This application explains the construction method of this application through specific embodiments.

[0051] The area of ​​Zone 1 near the construction joint (50mm~300mm) needs to be sloped to keep water away from the construction joint, with a slope of 3%~15%. When pouring Zone 1, steel bars with a specific curvature should be pre-embedded at the part that contacts the upturned covering structure 3. The steel bars connect Zone 1, Zone 2 and the upturned covering structure 3 to improve the overall structure.

[0052] Step 1: Determine the slope and starting point for the slope based on the structural location and waterproofing requirements. First, prepare to pour concrete for the first area (1). At the construction joint, set up formwork according to standard practices; the specific height of the formwork is determined by the slope. For example, if the slope starts 200mm from the construction joint with a 10% slope, the formwork at the construction joint should be raised by 20mm. The formwork should ensure that the vertical joint surface (4) formed by the concrete is straight and dense.

[0053] At the point where the first area 1 contacts the upturned covering structure 3, curved steel bars should be pre-embedded. The steel bars and the upper surface of the upturned covering structure 3 are concentric arcs. The steel bars connect the first area 1, the second area 2 and the upturned covering structure 3 to improve the overall structure.

[0054] After completing the above work, pour concrete according to the conventional method. Pay attention to creating a slope near the construction joint and pour the concrete in one go with the first area 1.

[0055] After pouring, confirm again that the arc-shaped reinforcing bars 8 are correctly embedded. At this time, the arc-shaped reinforcing bars 8 should be fixed on the first part and cantilevered towards the direction of the upward-turning covering structure 3 and the second area 2. The two ends of the first area 1, the second area 2, and the upward-turning covering structure 3 overlap with the bottom reinforcement 6 and the top reinforcement 7 of the floor slab. At the same time, reinforcement 9 perpendicular to the cross-section and parallel to the vertical joint surface 4 is provided in the upward-turning covering structure 3. Φ8@100 can be selected. At the same time, a steel plate, rubber, or PVC waterstop is embedded at the vertical joint surface.

[0056] Step 2: Preparations before the second pour

[0057] After the concrete in Zone 1 has fully set, remove the vertical formwork. Roughen or treat the joint surfaces of the construction joints with high-pressure water jet to expose the coarse aggregate and create a rough surface, then clean it thoroughly.

[0058] Before pouring the concrete in the second zone 2, thoroughly wet the vertical joint surface and the sloping joint surface 5 of the construction joint in the first zone 1 with water to make it suitable for secondary pouring. Since the weak point of waterproofing in this application is no longer at the joint surface between the two pours, it is not necessary to apply any chemical interface agent to this joint surface.

[0059] Step 3: Second concrete pouring and formation of the overturned cover structure 3

[0060] Arrange the formwork and reinforcement for the second area 2. Near the construction joint, mark the height, width, and other dimensions of the upturned covering structure 3. Shape the formwork to form a cavity for the upturned covering structure 3. This cavity is connected to the cavity of the second area 2. As an alternative and simplified solution suitable for less demanding or small-scale construction, the construction dimensions of the upturned covering structure 3 can also be determined in other ways. Instead of special formwork for the upturned covering structure 3, it can be poured directly together with the second area 2 and manually finished by workers.

[0061] Begin pouring concrete for the second zone 2. The concrete will simultaneously fill the mold cavities of both the second zone 2 and the upturned covering structure 3, thus allowing the second zone 2 and the upturned covering structure 3 to be cast as a single, integral piece. To further reduce the risk of shrinkage cracks at the interface between the old and new concrete and to improve the impermeability of the upturned structure itself, the concrete for both the upturned covering structure 3 and the second zone 2 can be shrinkage-compensating concrete mixed with crystalline waterproofing admixtures or shrinkage-reducing agents.

[0062] The geometry of the upturned cover structure 3 can be designed according to specific engineering requirements. In a typical embodiment:

[0063] The top surface of the upturned cover structure 3 is designed as an arc (R=425mm), which smoothly transitions from the highest point to both sides, effectively diverting water away from the construction joint.

[0064] The width of the upturned cover structure 3 can be set to 100mm~600mm. For example, it can be 400mm, that is, 200mm on each side of the construction joint.

[0065] The height of the highest point of the upward-flipping covering structure 3 relative to the upper surface of the first region 1 and the second region 2 is 30mm to 120mm, and for example, it can be set to 50mm.

[0066] Step 4: Maintenance

[0067] After the concrete is poured, the floor slabs should be cured in a timely manner according to the standard specifications.

[0068] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made under the concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A method for treating upward-turning construction joints in impermeable reinforced concrete floor slabs, characterized in that, The method for treating the upward construction joint of the impermeable reinforced concrete floor slab includes: Step 1: Pour the floor slab concrete in the first area (1) at the predetermined position, and form a vertical joint surface (4) of the construction joint and a slope joint surface (5) on the upper surface of the first area (1); Step 2: After the concrete in the first area (1) reaches the predetermined strength, roughen, clean and moisten the vertical joint surface (4) and the slope joint surface (5) of the construction joint; Step 3: Pour the floor slab concrete in the second area (2) adjacent to the first area (1), and while pouring the second area (2), integrally pour an upward covering structure (3) directly above the vertical joint surface (4). The upward covering structure (3) and the concrete in the second area (2) are of a one-time integral pouring structure, and a part of it extends and covers the top surface of the first area (1), so as to completely cover the vertical joint surface (4) of the construction joint.

2. The method for treating upward-turned construction joints in impermeable reinforced concrete floor slabs according to claim 1, characterized in that, The cross-sectional shape of the upward covering structure (3) is circular arc, trapezoid or triangle.

3. The method for treating upward-turned construction joints in impermeable reinforced concrete floor slabs according to claim 2, characterized in that, The top surface of the upward covering structure (3) has a preset radian or slope to guide water to both sides of the construction joint.

4. The method for treating upward-turned construction joints in impermeable reinforced concrete floor slabs according to claim 3, characterized in that, The radius R of the radian of the top surface of the upward covering structure (3) is 200mm < R < 600mm, and the slope of the top surface of the upward covering structure (3) is between 10% and 60%.

5. The method for treating upward-turned construction joints in impermeable reinforced concrete floor slabs according to claim 1, characterized in that, The slope of the slope joint surface (5) is 3% - 15%.

6. The method for treating upward-turned construction joints in impermeable reinforced concrete floor slabs according to claim 1, characterized in that, The width of the upward covering structure (3) is 100mm - 600mm, and the widths covering the top surfaces of the first area (1) and the second area (2) are 50mm - 300mm respectively.

7. The method for treating upward-turned construction joints in impermeable reinforced concrete floor slabs according to claim 1, characterized in that, The height of the highest point of the upward covering structure (3) relative to the upper surfaces of the first area (1) and the second area (2) is 30mm - 120mm.

8. The method for treating upward-turned construction joints in impermeable reinforced concrete floor slabs according to claim 1, characterized in that, Additional connecting steel bars or steel bar meshes for connecting the floor slab steel bars of the first area (1) and the second area (2) are arranged inside the upward covering structure (3).

9. The method for treating upward-turned construction joints in impermeable reinforced concrete floor slabs according to claim 1, characterized in that, Steel plates, rubber or PVC waterstops are embedded at the vertical joint surface (4).

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