High-pile wharf surface layer concrete construction quality control method

Abstract

The invention discloses a high-pile wharf surface layer concrete construction quality control method which comprises the following steps: S1, pouring precast panel abutted seam concrete, and moisturizing and curing for more than 21 days; s2, mounting a surface layer reinforcing mesh; the surface layer reinforcing mesh comprises longitudinal reinforcing steel bars and transverse reinforcing steel bars, and the intersections of the longitudinal reinforcing steel bars and the transverse reinforcing steel bars are bound by steel wires; the surface layer reinforcing mesh is supported by a plurality of steel vertical bars; s3, preparing surface layer concrete; s4, one-time block-by-block pouring of surface layer concrete is conducted in the direction perpendicular to the front line of the wharf; s5, when the depth of the fingers poked into the surface layer concrete cannot exceed 1-3 mm, surface finishing work of the surface layer concrete is conducted; s6, after surface layer concrete pouring is completed, film covering and water spraying maintenance is adopted immediately; and S7, joint cutting is started within 12 h after surface layer concrete pouring is completed. The problems of cracks and flatness of wharf surface layer concrete can be well solved.

Description

Technical Field

[0001] The invention relates to a method for controlling the construction quality of high-pile wharf surface layer concrete. Background Art

[0003] The surface of the seaport wharf is a thin concrete structure with a particularly large exposed area, which usually has the following problems:

[0004] 1. Cracks are very easy to occur; because the surface layer is an ultra-thin concrete structure, and because a large area is exposed to the environment, the temperature and humidity change quickly with the outside world, and the surface moisture is lost quickly, it is easy to produce early shrinkage cracks;

[0005] 2. Poor flatness: According to a large number of seaport and wharf engineering surveys, poor surface flatness leads to more potholes and bumps, and uneven stress. Once cracks occur and further expand, it will increase safety risks;

[0006] Traditional measures are basically unable to effectively solve the above-mentioned surface problems because they involve many factors such as materials, design, construction, and environment. Summary of the invention

[0007] The purpose of the present invention is to overcome the defects of the prior art and provide a method for controlling the construction quality of the surface concrete of a high-pile dock, which can well solve the problems of cracks and flatness of the surface concrete of the dock.

[0008] The object of the present invention is achieved by: a method for controlling the construction quality of high-pile wharf surface concrete, characterized in that the control method comprises the following steps:

[0009] S1, pouring concrete in the joints of precast panels and maintaining moisture retention for more than 21 days;

[0010] S2, installing the surface steel mesh; the surface steel mesh includes longitudinal steel bars and transverse steel bars, and the intersection of the longitudinal steel bars and the transverse steel bars is tied with steel wire; the surface steel mesh is supported by multiple steel vertical bars;

[0011] S3, prepare surface concrete; the mix ratio of surface concrete is: the amount of cementitious material is 360kg / m 3 ~400kg / m 3 ; Water-binder ratio is 0.36-0.40; sand ratio is 0.40-0.50; volume ratio of basalt structural fiber is 0.5%-1.0%;

[0012] S4, pour the surface concrete in blocks at one time in a direction perpendicular to the front line of the wharf;

[0013] S5, when the depth of the finger poking into the surface concrete cannot exceed 1mm to 3mm, the surface concrete finishing work is carried out;

[0014] S6: When the surface concrete is poured, it is immediately covered with film and watered for maintenance;

[0015] S7: Start cutting the joints within 12 hours after the surface concrete is poured.

[0016] The above-mentioned method for controlling the construction quality of the high-pile wharf surface concrete, wherein, when performing the step S1, the mix ratio of the prefabricated panel joint concrete is: the amount of cementitious material is 360kg / m 3 ~400kg / m 3 The water-to-cement ratio is 0.36-0.40, the sand ratio is 0.40-0.50, and the volume ratio of basalt structural fiber is 1.0%-2.0%.

[0017] The above-mentioned method for controlling the construction quality of the surface concrete of the high-pile dock, wherein, when performing the step S2, the spacing between the longitudinal steel bars and the transverse steel bars in the surface steel mesh is 10 cm; every 1 m 2 At least one vertical steel bar is arranged in the surface steel mesh; the overlap of the surface steel mesh is carried out by welding.

[0018] The above-mentioned method for controlling the construction quality of the high-pile wharf surface concrete, wherein, when performing the step S3, when preparing the surface concrete, first add coarse aggregate and fine aggregate, then add basalt structural fiber, and then add cementitious material, stir for 2 to 4 minutes, and finally add water and stir for 10 to 20 minutes to obtain the surface concrete.

[0019] The above-mentioned method for controlling the construction quality of the high-pile dock surface concrete, wherein the technical indicators of the basalt structural fiber are: fiber length 35mm; single fiber diameter 0.7-1.0mm; tensile strength ≥800Mpa; volume density 1.9-2.1g / cm 3 ; Elastic modulus ≥ 45Gpa; Elongation at break is 2.0%.

[0020] In the above-mentioned method for controlling the construction quality of the high-pile wharf surface layer concrete, when performing the step S4, the width of the surface layer concrete poured in blocks at one time does not exceed 5m, and the length does not exceed 30m.

[0021] The above-mentioned method for controlling the construction quality of the surface layer concrete of the high-pile dock, wherein, when performing the above-mentioned step S5, within 3 hours after the pouring of the surface layer concrete is completed, the surface coagulation state of the surface layer concrete is sensed by fingers, and when the depth of the finger poking into the surface layer concrete cannot exceed 3mm, the surface work is carried out, and when the depth of the finger poking into the surface layer concrete cannot exceed 1mm, the surface finishing work is carried out in combination with a small amount of watering;

[0022] The time for sensing the surface setting state of the surface concrete is determined according to the weather temperature; when the weather temperature exceeds 35°C and the surface concrete pouring is completed 2 hours later, the surface setting state of the surface concrete is sensed with fingers.

[0023] The above-mentioned method for controlling the construction quality of the surface concrete of the high-pile dock, wherein, when performing the step S7, after the concrete pouring is completed for 8 to 10 hours, a preliminary inspection of the cutting condition is performed, that is, manual cutting is performed using an angle grinder, and if edge collapse occurs, the cutting is stopped; if edge collapse does not occur, a cutting machine is used to perform horizontal and vertical cutting along the lines of the prefabricated panel joints, and the cutting depth is at least 5 cm;

[0024] The time for preliminary inspection of the cutting conditions shall be determined according to the weather temperature; when the weather temperature exceeds 35°C and the surface concrete pouring is completed for 8 hours, a preliminary inspection of the cutting conditions shall be carried out.

[0025] The characteristics of the method for controlling the construction quality of the high-pile wharf surface layer concrete of the present invention are:

[0026] 1. The present invention adds 2% by volume of basalt structural fiber into the prefabricated panel joint concrete to improve the crack resistance of the prefabricated panel joint concrete, so as to compensate for the local stress concentration phenomenon of the prefabricated panel joint, avoid the generation of cracks, and further avoid the extension of cracks to the surface concrete structure;

[0027] 2. The present invention puts forward higher requirements for the binding and fixing of the surface steel mesh, so as to ensure that the surface concrete is not damaged by stepping on both sides of the surface steel mesh during casting;

[0028] 3. The present invention casts the prefabricated panel joint concrete and the surface layer concrete separately, further avoiding the occurrence of surface layer concrete cracks caused by stress concentration;

[0029] 4. The present invention adopts the method of adding basalt structural fiber into the surface layer concrete and stipulates the technical index of basalt structural fiber, which can effectively improve the crack resistance of the surface layer concrete by more than 20%;

[0030] 5. The present invention proposes an operation method combined with engineering practice for the concrete finishing process, further ensuring the flatness of the surface concrete and reducing the pothole area by more than 50%;

[0031] 6. The present invention also proposes an operation method combined with engineering practice for the concrete cutting process, using an angle grinder to perform preliminary manual cutting, and using a cutting machine to perform final cutting, to ensure that the surface concrete can offset the mutual constraints of surface stress in time without edge collapse, thereby reducing the occurrence of cracks. DETAILED DESCRIPTION

[0032] The present invention will be further described below.

[0033] The method for controlling the construction quality of the high-pile dock surface layer concrete of the present invention comprises the following steps:

[0034] S1, pouring precast panel joint concrete and maintaining moisture for more than 21 days; the mix ratio of precast panel joint concrete is: the amount of cementitious material (cement) is 360kg / m 3 ~400kg / m 3 , the water-cement ratio is 0.36-0.40, the sand ratio is 0.40-0.50, and the volume ratio of basalt structural fiber is 1.0%-2.0%; when the volume ratio of basalt structural fiber reaches 2.0%, the initial crack resistance of concrete is improved by more than 20%; when the volume ratio of basalt structural fiber exceeds 2.0%, the fluidity of concrete is poor and cannot be pumped; the technical indicators of basalt structural fiber are: fiber length is 35mm; single fiber diameter is 0.7-1.0mm; tensile strength is ≥800Mpa; volume density is 1.9-2.1g / cm 3 ; Elastic modulus ≥ 45Gpa; Elongation at break 2.0%;

[0035] S2, install the surface steel mesh; the surface steel mesh includes longitudinal steel bars and transverse steel bars; the longitudinal steel bars are arranged below the transverse steel bars, and the spacing between the longitudinal steel bars and the transverse steel bars is 10cm; the intersections of the longitudinal steel bars and the transverse steel bars are tied with steel wires, which can effectively ensure that the surface steel mesh is not disturbed during the construction process; after the surface concrete is poured and before the final setting, when the surface steel mesh of the uncast blocks on both sides is stepped on, it will not disturb the surface steel mesh inside the cast blocks, resulting in the destruction of the surface concrete molding and affecting the internal strength of the surface concrete; the surface steel mesh is supported by multiple steel vertical bars; every 1m 2 At least one steel vertical bar is set in the surface steel mesh. The thickness of the surface concrete is generally 18cm. Through multiple steel vertical bars, the surface steel mesh is located 6 to 8cm away from the top surface of the surface. 2 Two vertical steel bars are set in the surface steel mesh to further improve the stability of the surface steel mesh. The stability can be determined by whether the surface steel mesh is disturbed by manual stepping. The overlap of the surface steel mesh is carried out by welding.

[0036] S3, prepare surface concrete; the mix ratio of the surface concrete is: the amount of cementitious material (cement) is 360kg / m 3 ~400kg / m 3 ; water-cement ratio is 0.36-0.40; sand ratio is 0.40-0.50; volume ratio of basalt structural fiber is 0.5%-1.0%; when preparing surface concrete, first add coarse aggregate and fine aggregate, then add basalt structural fiber, and then add cementitious material (cement), stir for 2-4 minutes, and finally add water and stir for 10-20 minutes to obtain surface concrete; technical indicators of basalt structural fiber are: fiber length is 35mm; single fiber diameter is 0.7-1.0mm; tensile strength is ≥800Mpa; volume density is 1.9-2.1g / cm 3 ; Elastic modulus ≥ 45Gpa; Elongation at break 2.0%;

[0037] S4, pour the surface concrete in blocks at once in a direction perpendicular to the front line of the wharf; the width of the one-time block pouring shall not exceed 5m, preferably 4m-5m, and the length of the one-time block pouring shall not exceed 30m, preferably 20m-30m; controlling the area of ​​the one-time block pouring can reduce the surface tensile stress of the surface concrete;

[0038] S5: When the surface concrete is poured, it is immediately covered with film and watered for maintenance;

[0039] S6, when the depth of the finger poking into the surface concrete cannot exceed 1mm to 3mm, the surface concrete finishing work is carried out; within 3 hours after the surface concrete pouring is completed, the surface coagulation state of the surface concrete is felt by the finger, and when the depth of the finger poking into the surface concrete cannot exceed 3mm, the surface plastering work is carried out; when the depth of the finger poking into the surface concrete cannot exceed 1mm, the surface finishing work is carried out in combination with a small amount of watering;

[0040] The time for sensing the surface coagulation state of the surface concrete can also be determined according to the weather temperature; when the weather temperature exceeds 35°C and the surface concrete pouring is completed 2 hours later, the surface coagulation state of the surface concrete can be sensed by fingers;

[0041] S7: Start cutting the joints within 12 hours after the surface concrete is poured;

[0042] 8 to 10 hours after the concrete pouring is completed, conduct a preliminary inspection of the cutting conditions, that is, use an angle grinder to manually cut the seams. If edge collapse occurs, stop cutting the seams; if edge collapse does not occur, use a cutting machine to cut the seams horizontally and vertically along the lines of the prefabricated panel joints, with a cutting depth of at least 5 cm;

[0043] The time for preliminary inspection of the cutting conditions can also be determined based on the weather temperature; when the weather temperature exceeds 35°C and the surface concrete pouring is completed 8 hours later, a preliminary inspection of the cutting conditions should be carried out.

[0044] The above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Those skilled in the relevant technical field may make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also belong to the scope of the present invention and should be defined by the claims.

Claims

1. A method for controlling the construction quality of high-pile wharf surface concrete, characterized in that: The control method comprises the following steps: S1, pouring concrete in the joints of precast panels and maintaining moisture retention for more than 21 days; S2, installing the surface steel mesh; the surface steel mesh includes longitudinal steel bars and transverse steel bars, and the intersection of the longitudinal steel bars and the transverse steel bars is tied with steel wire; the surface steel mesh is supported by multiple steel vertical bars; S3, prepare surface concrete; the mix ratio of surface concrete is: the amount of cementitious material is 360kg / m 3 ~400kg / m 3 ; Water-binder ratio is 0.36-0.40; sand ratio is 0.40-0.50; volume ratio of basalt structural fiber is 0.5%-1.0%; S4, pour the surface concrete in blocks at one time in a direction perpendicular to the front line of the wharf; S5, when the depth of the finger poking into the surface concrete cannot exceed 1mm to 3mm, the surface concrete finishing work is carried out; S6: When the surface concrete is poured, it is immediately covered with film and watered for maintenance; S7: Start cutting the joints within 12 hours after the surface concrete is poured.

2. The method for controlling the construction quality of the high-pile wharf surface concrete according to claim 1 is characterized in that: When performing step S1, the mix ratio of the prefabricated panel joint concrete is: the amount of cementitious material is 360kg / m 3 ~400kg / m 3 The water-to-cement ratio is 0.36-0.40, the sand ratio is 0.40-0.50, and the volume ratio of basalt structural fiber is 1.0%-2.0%.

3. The method for controlling the construction quality of the high-pile wharf surface concrete according to claim 1 is characterized in that: When performing step S2, the spacing between the longitudinal steel bars and the transverse steel bars in the surface steel mesh is 10 cm; 2 At least one vertical steel bar is arranged in the surface steel mesh; the overlap of the surface steel mesh is carried out by welding.

4. The method for controlling the construction quality of the high-pile wharf surface concrete according to claim 1 is characterized in that: When performing the step S3, when preparing the surface layer concrete, first add coarse aggregate and fine aggregate, then add basalt structural fiber, and then add cementitious material, stir for 2 to 4 minutes, and finally add water and stir for 10 to 20 minutes to obtain the surface layer concrete.

5. The method for controlling the construction quality of the high-pile wharf surface concrete according to any one of claims 1, 2 or 4, characterized in that: The technical indicators of the basalt structural fiber are: fiber length 35mm; single fiber diameter 0.7-1.0mm; tensile strength ≥800Mpa; volume density 1.9-2.1g / cm 3 ; Elastic modulus ≥ 45Gpa; Elongation at break is 2.0%.

6. The method for controlling the construction quality of high-pile wharf surface concrete according to claim 1 is characterized in that: When performing step S4, the width of the surface layer concrete poured in blocks at one time does not exceed 5m, and the length does not exceed 30m.

7. The method for controlling the construction quality of high-pile wharf surface concrete according to claim 1 is characterized in that: When performing the step S5, within 3 hours after the pouring of the surface concrete is completed, use your fingers to feel the surface setting state of the surface concrete, and when the depth of the finger poking into the surface concrete cannot exceed 3mm, perform the surface plastering work, and when the depth of the finger poking into the surface concrete cannot exceed 1mm, perform the surface finishing work in combination with a small amount of water sprinkling; Determine the time to perceive the surface setting state of the surface concrete according to the weather temperature; When the weather temperature exceeds 35℃ and the surface concrete pouring is completed for 2 hours, the surface setting state of the surface concrete is felt with fingers.

8. The method for controlling the construction quality of high-pile wharf surface concrete according to claim 1 is characterized in that: When performing the step S7, wait for 8 to 10 hours after the concrete pouring is completed, and then conduct a preliminary inspection of the cutting conditions, that is, use an angle grinder to manually cut the seams. If edge collapse occurs, stop cutting the seams; if edge collapse does not occur, use a cutting machine to cut the seams horizontally and vertically along the lines of the prefabricated panel joints, and the cutting depth is at least 5 cm; The time for preliminary inspection of the cutting conditions shall be determined according to the weather temperature; when the weather temperature exceeds 35°C and the surface concrete pouring is completed for 8 hours, a preliminary inspection of the cutting conditions shall be carried out.