Method for preventing concrete slurry leakage in concrete pouring construction

Abstract

The invention provides a method for preventing concrete slurry leakage in concrete pouring construction, which comprises the following steps of: marking an elevation control point on a reinforcing steel bar before the concrete pouring construction operation, timely carrying out slurry collection and plastering after the concrete pouring of a bottom plate plane is finished, and controlling the flatness within 5mm; enclosing wall and column templates are assembled according to the design size, one-time mold sealing is adopted, a full-length sponge strip with the thickness of 5 mm is attached to the bottom of a wall root along a template line, and edge pressing treatment is conducted on the templates through battens along a template control line; and after the bottom sealing mortar pouring formwork is installed, concrete mortar with the same mark number and the height of 5-10 cm is poured firstly, and then column pouring is conducted. According to the method, the quality problems of root rot, holes and the like caused by slurry leakage are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a method for preventing concrete slurry leakage during concrete pouring construction. Background Art

[0002] In the modern construction industry, whether it is industrial or civil construction, concrete pouring can be seen everywhere during the foundation construction and main structure construction. Since the bottom of the foundation concrete, the joints of the formwork and other parts often cause root rot, holes and other poor quality problems due to leakage, this problem has not been completely solved so far and has become a common quality problem in construction projects. Although these phenomena do not have much impact on the structural safety of the entire building system, there will always be a period of time from the completion of the structural construction to the elimination of wall defects. No matter how they are repaired and concealed, these quality problems will always be exposed to people for a long time, seriously affecting the appearance of the main structure. Summary of the invention

[0003] In order to solve the problems of root rot and holes caused by concrete leakage during concrete pouring construction, the invention provides a method for preventing concrete leakage during concrete pouring construction.

[0004] In order to achieve the purpose of the present invention, the technical solution adopted by the present invention is:

[0005] A method for preventing concrete slurry leakage during concrete pouring construction comprises the following steps:

[0006] A. Marking height control points

[0007] Before concrete pouring, mark the elevation control points on the steel bars for real-time measurement to ensure the accuracy of the concrete surface elevation.

[0008] B. Foundation plane pouring

[0009] After the bottom plate is poured, the concrete should be smoothed and the flatness should be controlled within 5mm.

[0010] Position and lay out the outer surface, and roughen the joints between the formwork and the concrete surface;

[0011] C. Template installation

[0012] Assemble the wall and column formwork according to the design size, use one-time sealing, paste 5mm thick full-length sponge strips along the formwork line at the bottom of the wall, increase or decrease the thickness of the sponge strips according to the elevation control point, make the sponge strips fit tightly with the ground and the upper surface is flush with the elevation, use wooden strips to press the formwork along the formwork control line to prevent the formwork from shifting, and the bottom of the formwork

[0013] The contact surface is in close contact with the sponge strips and wooden strips;

[0014] D. Pouring the bottom mortar

[0015] After the formwork is installed, first pour concrete mortar of the same grade with a height of 5-10cm, and then pour the columns. This will act as a guide for the concrete and reduce the root rot of the concrete columns.

[0016] When pouring on the foundation plane, the present invention starts from one end and advances to the other end, and the concrete flows naturally to form a slope, and the slope ratio is not greater than 1:3, so as to avoid the occurrence of construction cold joints. If the thickness of the concrete pouring exceeds 500-600mm, it is poured in layers, and vibrated immediately after laying, and inserted into the depth of the lower layer of concrete is 50mm.

[0017] The slurry finishing of the foundation plane casting of the present invention refers to: using a 1m aluminum alloy scraper to scrape, adjust, and compound the elevation, the error is controlled within 5mm, and after scraping, a wooden trowel is used to perform the first smoothing to ensure the surface is smooth. Before the concrete solidifies, the construction personnel use a wooden trowel to smooth the second time, and then use an iron trowel to press, and then use a level to review, the level tower ruler is erected at the elevation control point of the steel bar, and the secondary finishing is based on the polished elevation control point to ensure that the flatness is controlled within 5mm.

[0018] In step C of the present invention, wooden strips are placed at the edge of the sponge strips and pressed evenly with force, so that the sponge strips fit more closely to the concrete surface to avoid gaps and unevenness.

[0019] According to the present invention, the solid-liquid ratio of the concrete is 1:0.5 by mass, and the solid components include the following components: 500 parts of cement, 1000 parts of medium sand, 800 parts of fine sand, 1500 parts of crushed stone, 250 parts of bentonite, 20 parts of admixture and 10 parts of sodium silicate.

[0020] Preferably, the additive is sodium carboxymethyl cellulose and polyethylene glycol monomaleate in a mass ratio of 3:1.

[0021] The concrete mortar in step D of the present invention is half-gravel concrete with the same composition as the concrete, and the column concrete is vibrated in layers. The insertion depth of the insert vibrator exceeds 1.25 times the thickness of the casting layer and is not more than 50 cm. The vibrating rod must not touch the steel bars and embedded parts, and there must be someone below to knock on the formwork at any time.

[0022] Preferably, before pouring concrete, water should be poured to wet the bottom of the base plate to ensure that the bottom is sufficiently humid so that the water can fully penetrate into the concrete to improve the strength and durability of the concrete. When operating the vibrator, insert it vertically, insert it quickly, and pull it out slowly to avoid leaving gaps in the concrete; each insertion and vibration time is 20-30 seconds, and the concrete is no longer significantly sunk, no bubbles appear, and the slurry begins to overflow.

[0023] Preferably, when pouring concrete in layers, when vibrating the upper layer, insert 5-10 cm into the lower layer to eliminate the joint between the two layers, and when vibrating the upper layer of concrete, do so before the lower layer of concrete begins to set.

[0024] The beneficial effects of the present invention are:

[0025] 1. The present invention seals the molds of the foundation concrete columns and the surrounding walls at one time, and casts them at one time without segmented construction. The overall flatness is higher, and quality problems such as root rot and holes are avoided.

[0026] 2. The present invention utilizes the stickiness and ductility of the sponge strip to seal 95% of the gaps, achieving mud bottom sealing. The wooden strip edge pressing can prevent the joints at the bottom of the template from leaking due to deformation caused by the expansion of concrete. The process greatly reduces the leakage of foundations such as walls and columns during concrete pouring due to uneven ground surfaces and loose template overlaps, resulting in uneven surfaces, rotten roots, and holes on the walls and columns, saving manpower and material costs for repairs after pouring, and better ensuring the molding quality and visual quality of joints.

[0027] 3. The concrete formula of the present invention adopts a specific ratio of medium sand and fine sand and a solid-liquid ratio, increases the amount of fine sand, and accurately controls the amount of bentonite, sodium silicate and admixture sodium carboxymethyl cellulose to ensure the fluidity and compressive properties of the concrete. Maleic acid polyethylene glycol monoester is further selected as a water reducer, and the ratio of maleic acid polyethylene glycol monoester to sodium carboxymethyl cellulose is accurately controlled to enhance the impermeability and dispersibility of the concrete, enhance its fluidity, and will not cause leakage due to the poor quality of the concrete slurry, further avoid leakage, and be resistant to solid and seepage. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the template at the bottom of the wall base of the present invention. DETAILED DESCRIPTION

[0029] In order to more clearly and in detail illustrate the technical solution of the present invention, the present invention is further described below through relevant embodiments. The following embodiments are only for specific explanation of the implementation method of the present invention, and do not limit the protection scope of the present invention.

[0030] Example 1

[0031] A method for preventing concrete slurry leakage during concrete pouring construction comprises the following steps:

[0032] A. Marking height control points

[0033] Before concrete pouring, mark the elevation control points on the steel bars for real-time measurement to ensure the accuracy of the concrete surface elevation.

[0034] B. Foundation plane pouring

[0035] After the bottom plate is poured, the concrete should be smoothed and the flatness should be controlled within 5mm.

[0036] Position and lay out the outer surface, and roughen the joints between the formwork and the concrete surface;

[0037] C. Template installation

[0038] Assemble the wall and column formwork according to the designed dimensions, use one-time formwork sealing, paste a 5mm thick full-length sponge strip along the formwork line at the bottom of the wall, increase or decrease the thickness of the sponge strip according to the elevation control point, make the sponge strip fit tightly with the ground and the upper surface is flush with the elevation, use wooden strips to press the formwork along the formwork control line to prevent the formwork from shifting, and the bottom contact surface of the formwork is tightly fitted with the sponge strip and wooden strip;

[0039] Increase or decrease the thickness of the sponge strip: According to the different elevations, observe whether there is a gap between the bottom of the pasted sponge strip template and the ground plane or the pasted sponge strip template causes the template elevation to increase. Increase or decrease the thickness of the sponge strip in turn. If it exceeds the elevation of other templates, draw a horizontal line and use a blade to cut off the excess thickness: If the bottom of the pasted sponge strip template is not tightly attached to the ground plane, use the original horizontal line to stick a sponge strip of appropriate thickness that can be tightly attached on the basis of the original sponge strip.

[0040] D. Pouring the bottom mortar

[0041] After the formwork is installed, first pour concrete mortar of the same grade with a height of 5-10cm, and then pour the columns. This will act as a guide for the concrete and reduce the root rot of the concrete columns.

[0042] Example 2

[0043] This embodiment is based on embodiment 1:

[0044] When pouring the foundation plane, start from one end and move toward the other end. The concrete will flow naturally to form a slope with a slope ratio of no more than 1:3. If the thickness of the concrete pouring exceeds 500-600mm, pour it in layers and vibrate it immediately after laying, inserting it into the lower layer of concrete to a depth of 50mm.

[0045] The slurry finishing of the foundation plane pouring refers to: using a 1m aluminum alloy scraper to scrape, adjust, and compound the elevation, with the error controlled within 5mm. After scraping, use a wooden trowel to do the first smoothing to ensure the surface is flat. Before the concrete solidifies, the construction workers use a wooden trowel to smooth the second time, and then use an iron trowel to press it, and then use a level to review it. The level tower is erected at the elevation control point of the steel bar, and the second finishing is based on the polished elevation control point.

[0046] In the step C, wooden strips are placed on the edge of the sponge strips and pressed evenly to make the sponge strips fit more closely to the concrete surface to avoid gaps and unevenness.

[0047] Example 3

[0048] This embodiment is based on embodiment 1:

[0049] The concrete mortar in step D is half-gravel concrete with the same composition as the concrete, and the column concrete is vibrated in layers. The insertion depth of the insert vibrator exceeds 1.25 times the thickness of the casting layer and is not more than 50 cm. The vibrating rod must not touch the steel bars and embedded parts, and there must be someone below to knock on the formwork at any time.

[0050] Before pouring concrete, first wet the bottom of the base plate with water; when operating the vibrator, insert it vertically, insert it quickly and pull it out slowly to avoid leaving gaps in the concrete; each insertion and vibration time is 20-30 seconds, and it is determined when the concrete no longer sinks significantly, no bubbles appear, and begins to overflow.

[0051] Example 4

[0052] This embodiment is based on Embodiment 3:

[0053] When pouring concrete in layers, when vibrating the upper layer, insert 5-10cm into the lower layer to eliminate the joint between the two layers. Also, when vibrating the upper layer of concrete, do it before the lower layer of concrete begins to set.

[0054] Example 5

[0055] The present invention mixes 14 groups of concrete with different mix ratios, and the concrete mix ratio values ​​are shown in Table 1. The performance of the 14 groups of concrete is tested, and the test results are shown in Table 2.

[0056] Table 1 Concrete mix ratio numerical table

[0057]

[0058] Table 2 Comprehensive performance test results of concrete

[0059]

[0060]

[0061] As can be seen from Table 2, from the data of groups 1-4, it can be seen that the ratio of medium sand and fine sand in group 3 is beneficial to the fluidity of concrete, the compressive strength of concrete in group 4 will decrease due to the excessive amount of fine sand, and the compressive strength of concrete in groups 10-14 is higher after adding a small amount of sodium silicate. The water reduction rate and apparent viscosity value of group 13 show that the fluidity and compressive strength of concrete are both optimal, while the decrease in the solid-liquid ratio in group 14 caused the compressive strength of concrete to decrease significantly.

[0062] The present invention is based on the concrete of group 13, and different types of water reducing agents are added. The performance test results are shown in Table 3.

[0063] Table 3 Comprehensive performance test results of concrete

[0064]

[0065]

[0066] It can be seen from Table 3 that the addition of maleic acid polyethylene glycol monoester in group 17 is more conducive to the fluidity of concrete without affecting the compressive strength ratio. On the basis of group 17, the ratio of sodium carboxymethyl cellulose to water reducer is adjusted, and it is found that the concrete fluidity is best when the ratio is 3:1 and still maintains high compressive performance.

[0067] The present invention adopts the concrete slurry of the 17th mix ratio in the substation foundation of the 88MW fish-light complementary photovoltaic power station project in Qilian Street, Jinping District, Shantou City, and the power supply to the island project (island section) of Huaneng Xiapu Nuclear Power Construction. According to the concrete construction method of Example 1, instead of directly pouring the concrete wall, the foundation concrete columns and the substation wall are poured at one time without quality problems such as root rot and holes, thereby achieving good economic and social benefits.

[0068] The above-mentioned embodiments only express the specific implementation of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A method for preventing concrete leakage during concrete pouring construction, characterized in that: The following steps are involved: A. Marking height control points Before concrete pouring, mark the elevation control points on the steel bars for real-time measurement to ensure the accuracy of the concrete surface elevation. B. Foundation plane pouring After the concrete pouring of the bottom plate is completed, the surface should be smoothed in time, the flatness should be controlled within 5mm, the outer surface of the concrete should be positioned and laid out, and the joints between the formwork and the concrete surface should be roughened uniformly; C. Template installation Assemble the wall and column formwork according to the designed dimensions, use one-time formwork sealing, paste a 5mm thick full-length sponge strip along the formwork line at the bottom of the wall, increase or decrease the thickness of the sponge strip according to the elevation control point, make the sponge strip fit tightly with the ground and the upper surface is flush with the elevation, use wooden strips to press the formwork along the formwork control line to prevent the formwork from shifting, and the bottom contact surface of the formwork is tightly fitted with the sponge strip and wooden strip; D. Pouring the bottom mortar After the formwork is installed, first pour concrete mortar of the same grade with a height of 5-10cm, and then pour the columns.

2. The method for preventing concrete leakage during concrete pouring construction according to claim 1, characterized in that: When pouring the foundation plane, start from one end and move toward the other end. The concrete will flow naturally to form a slope with a slope ratio of no more than 1:

3. If the thickness of the concrete pouring exceeds 500-600mm, pour it in layers and vibrate it immediately after laying, inserting it into the lower layer of concrete to a depth of 50mm.

3. The method for preventing concrete leakage during concrete pouring construction according to claim 1, characterized in that: The slurry finishing of the foundation plane pouring refers to: using a 1m aluminum alloy scraper to scrape, adjust, and compound the elevation, with the error controlled within 5mm. After scraping, use a wooden trowel to do the first smoothing to ensure the surface is flat. Before the concrete solidifies, the construction workers use a wooden trowel to smooth the second time, and then use an iron trowel to press it, and then use a level to review it. The level tower is erected at the elevation control point of the steel bar, and the second finishing is based on the smoothed elevation control point.

4. The method for preventing concrete leakage during concrete pouring construction according to claim 1, characterized in that: In the step C, a wooden strip is placed on the edge of the sponge strip and pressed evenly.

5. The method for preventing concrete leakage during concrete pouring construction according to claim 1, characterized in that: The solid-liquid ratio of the concrete is 1:0.5 by mass, and the solid components include the following: 500 parts of cement, 500 parts of medium sand, 1000 parts of fine sand, 1000 parts of crushed stone, 250 parts of bentonite, 20 parts of admixture and 10 parts of sodium silicate.

6. The method for preventing concrete leakage during concrete pouring construction according to claim 5, characterized in that: The additives are sodium carboxymethyl cellulose and polyethylene glycol monoester of maleic acid, and the mass ratio is 3:

1.

7. The method for preventing concrete leakage during concrete pouring construction according to claim 1, characterized in that: The concrete mortar in step D is half-gravel concrete with the same composition as the concrete, and the column concrete is vibrated in layers. The insertion depth of the insert vibrator exceeds 1.25 times the thickness of the casting layer and is not more than 50 cm. The vibrating rod must not touch the steel bars and embedded parts, and there must be someone below to knock on the formwork at any time.

8. The method for preventing concrete leakage during concrete pouring construction according to claim 7, characterized in that: Before pouring concrete, first wet the bottom of the base plate with water; when operating the vibrator, insert it vertically, insert it quickly and pull it out slowly to avoid leaving gaps in the concrete; each insertion and vibration time is 20-30 seconds, and it is determined when the concrete no longer sinks significantly, no bubbles appear, and begins to overflow.

9. The method for preventing concrete leakage during concrete pouring construction according to claim 7, characterized in that: When pouring concrete in layers, when vibrating the upper layer, insert 5-10cm into the lower layer to eliminate the joint between the two layers. Also, when vibrating the upper layer of concrete, do it before the lower layer of concrete begins to set.

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