A method for casting mass concrete

Abstract

The application discloses a pouring method of mass concrete and relates to the technical field of building construction, which comprises the following steps: firstly, preparing concrete, transferring the concrete into automobile pump A and automobile pump B, pouring the bottom layer of a foundation pit along one direction by automobile pump A, and the pouring thickness is 0.3-0.5 m; while pouring by automobile pump A, the bottom layer of concrete poured by automobile pump A is vibrated by using a vibrating rod, the vibrating points are in a tabular form, one steel bar with a length of 0.1-0.2 m is inserted into the vibrating point every time of vibration, while vibrating, the second layer of concrete is poured on the bottom layer of concrete which has been vibrated by automobile pump B along the pouring direction of automobile pump A, the pouring thickness is 0.3-0.5 m, the upper layer of concrete is completed covering before the lower layer of concrete is initially solidified, and the above steps are repeated until the uppermost layer is poured, and the uppermost layer of concrete does not need to be inserted with a steel bar; the concrete with high compressive capacity can be obtained by using the method.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building construction, in particular to a pouring method of mass concrete. BACKGROUND

[0002] Concrete is one of the most important civil engineering materials in the present age. It is a kind of artificial stone made of cementing material, granular aggregate (also known as aggregate), water, and, if necessary, added agent and admixture in a certain proportion, uniformly mixed, compacted, and cured to harden. Concrete has the characteristics of abundant raw materials, low price, and simple production process, thus making its use more and more extensive. Meanwhile, concrete also has the characteristics of high compressive strength, good durability, and wide range of strength grade. These characteristics make it widely used not only in various civil engineering, but also in shipbuilding industry, mechanical industry, ocean development, and geothermal engineering.

[0003] With the progress of science and technology, concrete has been used in large buildings such as bridges and buildings, thus extending the pouring of mass concrete.

[0004] For mass concrete poured buildings, the quality of the formed concrete is particularly important. Since mass concrete buildings need to bear greater pressure, the compressive strength of the formed concrete is required to be very high. However, in the existing mass concrete pouring method, the compressive strength of the formed concrete is not much different, and therefore, a mass concrete pouring method that can improve the compressive strength is needed. SUMMARY

[0005] The purpose of the present application is to provide a pouring method of mass concrete, which solves the following technical problems:

[0006] How to improve the compressive strength of mass concrete after forming.

[0007] The purpose of the present application can be achieved by the following technical solutions:

[0008] A pouring method of mass concrete, comprising the following steps:

[0009] S1: preparing concrete, comprising the following steps:

[0010] (1) preparing medium-low heat cement, medium-coarse sand, stone with a particle size of 15-25 mm, and water in a mass ratio of 1:(2-3):(3-3.5):(0.5-0.6);

[0011] (2) adding cement and sand into a mixer to mix uniformly to form material A;

[0012] (3) adding stone into material A to mix uniformly to form material B;

[0013] (4) adding 20-30% cement weight of calcium lignosulfonate, 5-10% cement weight of fly ash into water and stirring evenly to obtain material C;

[0014] (5) adding material C into material B and stirring until uniform while adding to obtain material D;

[0015] (6) adding 6-8% cement weight of expanding agent into material D and stirring evenly to obtain concrete.

[0016] S2: transferring the concrete into automobile pump A and automobile pump B;

[0017] S3: pouring the bottom layer of the foundation pit along one direction by automobile pump A, and the pouring thickness is 0.3-0.5m;

[0018] S4: vibrating the bottom layer of concrete poured by automobile pump A by using a vibrating rod while pouring, and the vibrating points are distributed in a matrix form, and one steel bar with a length of 0.1-0.2m is inserted into the vibrating point every time of vibrating;

[0019] S5: continuing to pour the second layer along the pouring direction of automobile pump A on the bottom layer of concrete after vibrating by automobile pump B while vibrating, and the pouring thickness is 0.3-0.5m, and the upper layer of concrete is completed covering before the lower layer of concrete is initially cured;

[0020] S6: continuing to repeat the steps of S2-S5 until the uppermost layer is poured, and the uppermost layer of concrete does not need to insert a steel bar.

[0021] In a further scheme: in S1, the clay content of the medium-coarse sand is less than 1%, and the clay content of the stone is less than 2%.

[0022] In a further scheme: in S1, the expanding agent is UEA composite expanding agent.

[0023] In a further scheme: in S4, the action radius of the vibrating rod is 300-350mm.

[0024] In a further scheme: in S4, the distance between every two vibrating points is 450-525mm.

[0025] In a further scheme: in S4, the vibrating point positions of different layers of concrete are staggered.

[0026] In a further scheme: in S4, the diameter of the steel bar is 2-3cm.

[0027] The beneficial effects of the present application are:

[0028]

[0028] The method for pouring mass concrete provided by the application prepares high-quality concrete by selecting specified concrete raw materials and preparing the concrete according to specific proportions, lays the concrete in the foundation trench in a seal coat manner, and vibrates each layer of the concrete by using a vibrating rod, wherein the vibration points of different layers are staggered, and a steel bar is inserted into each vibration point. After the concrete is completely formed and solidified, the concrete with high compressive strength is obtained. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the embodiments of the application. Obviously, the described embodiments are only some of the embodiments of the application, but not all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0030] Embodiment 1

[0031] Step 1: A foundation trench with a length of 10 m, a width of 1 m and a height of 0.8 m is dug.

[0032] Step 2: 250 kg of cement, 500 kg of medium-coarse sand with a mud content of 0.5%, 750 kg of stones with a particle size of 20 mm and a mud content of 1% and 125 kg of water are prepared as raw materials. The cement and the medium-coarse sand are added into a mixer to be uniformly mixed to form material A. The stones are added into material A to be uniformly stirred to form material B. Water, 50 kg of calcium lignosulfonate and 13 kg of fly ash are added into a mixing machine to be uniformly mixed to form material C. Material C is added into material B to be stirred, and material D is obtained after uniform stirring. Finally, 8 kg of UEA composite expanding agent is added into material D to be uniformly stirred, and the concrete is obtained.

[0033] The above entire process is repeated 8 times, and 885 cm 3 of concrete is finally obtained.

[0034] Step 3: The concrete is transferred into automobile pump A and automobile pump B.

[0035] Step 4: The automobile pump A is used to pour the bottom layer of the foundation trench in one direction, and the pouring thickness is 0.3 m.

[0036] Step 5: While the automobile pump A is pouring, a vibrating rod with a radius of action of 300 mm is used to vibrate the bottom layer of concrete poured by the automobile pump A, the vibration points are arranged in a matrix, the distance between every two vibration points is 450 mm, and a steel bar with a length of 0.1 m and a diameter of 2 cm is inserted into the vibration point every time.

[0037] Step 6: While vibrating, the second layer of pouring is continued on the bottom layer of concrete which has been vibrated by the truck pump B along the pouring direction of the truck pump A, and the pouring thickness is 0.3m, and the upper layer of concrete is completed before the initial setting of the lower layer of concrete;

[0038] Step 7: Continue to repeat steps 3-6, and it should be noted that the positions of the vibrating points of different layers are kept staggered until the uppermost layer is poured, and the uppermost layer of concrete does not need to be inserted with steel bars.

[0039] Example 2

[0040] Step 1: Dig a foundation trench with a length of 10m, a width of 1m, and a height of 0.8m.

[0041] Step 2: Prepare 250kg of cement, 625kg of medium-coarse sand with a 0.5% mud content, 800kg of stones with a particle size of 20mm and a 1% mud content, and 137kg of water as raw materials, mix the cement and medium-coarse sand in the mixer to form material A, then add stones to material A to form material B, add water, 65kg of calcium lignin sulfonate, and 18kg of fly ash to the mixer, mix them evenly to form material C, then add material C to material B while stirring, and after stirring evenly, obtain material D, finally add 10kg of UEA composite expansive agent to material D and stir evenly to obtain concrete.

[0042] Repeat the above entire process 8 times to finally obtain 899cm 3 of concrete.

[0043] Step 3: Transfer the concrete to the truck pump A and the truck pump B;

[0044] Step 4: Pour the bottom layer of the foundation trench along one direction by the truck pump A, and the pouring thickness is 0.4m;

[0045] Step 5: While pouring by the truck pump A, use a vibrating rod with a radius of action of 325mm to vibrate the bottom layer of concrete which has been poured by the truck pump A, and the vibrating points are distributed in a row and column manner, and the distance between every two vibrating points is 487mm, and a steel bar with a length of 0.15m and a diameter of 2.5cm is inserted into the vibrating point every time;

[0046] Step 6: While vibrating, the second layer of pouring is continued on the bottom layer of concrete which has been vibrated by the truck pump B along the pouring direction of the truck pump A, and the pouring thickness is 0.4m, and the upper layer of concrete is completed before the initial setting of the lower layer of concrete;

[0047] Step 7: Continue to repeat steps 3-6, and it should be noted that the positions of the vibrating points of different layers are kept staggered until the uppermost layer is poured, and the uppermost layer of concrete does not need to be inserted with steel bars.

[0048] Example 3

[0049] First step: digging a foundation trench with a length of 10 m, a width of 1 m, and a height of 0.8 m.

[0050] Second step: preparing 250 kg of cement, 750 kg of medium-coarse sand with a 0.5% clay content, 875 kg of stones with a particle size of 20 mm and a 1% clay content, and 150 kg of water as raw materials, mixing the cement and medium-coarse sand in a mixer to form material A, then adding stones to material A and stirring evenly to form material B; adding water, 75 kg of calcium lignosulfonate, and 25 kg of fly ash in a mixer, mixing evenly to form material C, adding material C to material B while stirring, and stirring evenly to obtain material D, and finally adding 13 kg of UEA composite expansive agent to material D and stirring evenly to obtain the concrete.

[0051] Repeating the above entire process 7 times, finally obtaining 831 cm 3 of concrete.

[0052] Third step: transferring the concrete to automobile pump A and automobile pump B;

[0053] Fourth step: pouring the bottom layer of the foundation trench in one direction by automobile pump A, with a pouring thickness of 0.5 m;

[0054] Fifth step: while automobile pump A is pouring, using a vibrating rod with a radius of action of 350 mm to vibrate the bottom layer of concrete poured by automobile pump A, the vibrating points are arranged in a row and column manner, the distance between every two vibrating points is 525 mm, and a steel bar with a length of 0.2 m and a diameter of 3 cm is inserted into the vibrating point every time;

[0055] Sixth step: while vibrating, continue to pour the second layer on the bottom layer of concrete that has been vibrated by automobile pump B in the pouring direction of automobile pump A, with a pouring thickness of 0.5 m, and the upper layer of concrete is completed before the lower layer of concrete is initially cured;

[0056] Seventh step: continue to repeat steps three to six, and it should be noted that the vibrating points of different layers are staggered, until the uppermost layer is poured, and the uppermost layer of concrete does not need to be inserted with a steel bar.

[0057] Comparative example

[0058] First step: digging a foundation trench with a length of 10 m, a width of 1 m, and a height of 0.8 m.

[0059] Second step: prepare 250kg cement, 750kg medium-coarse sand with 0.5% of mud content, 875kg stone with 20mm of particle size and 1% of mud content, and 150kg water as raw materials, mix the cement and medium-coarse sand in a mixer to form material A, then add the stone to material A to form material B; add water, 75kg calcium lignosulfonate and 25kg fly ash in a mixer, mix them evenly to form material C, then add material C to material B while stirring, mix them evenly to obtain material D, finally add 13kg UEA composite expansive agent to material D to mix them evenly, and then the concrete is obtained;

[0060] Repeat the above entire process 7 times, and finally obtain 838cm 3 of concrete.

[0061] Third step: transfer the concrete to automobile pump A and automobile pump B;

[0062] Fourth step: pour the bottom layer of the foundation pit along one direction by automobile pump A, and the pouring thickness is 0.5m;

[0063] Fifth step: while pouring by automobile pump A, use a vibrating rod with a radius of 350mm to vibrate the bottom layer of concrete poured by automobile pump A, and the vibrating points are distributed in a row and column manner, and the distance between every two vibrating points is 525mm;

[0064] Sixth step: while vibrating, continue to pour the second layer on the bottom layer of concrete which has been vibrated by automobile pump B along the pouring direction of automobile pump A, and the pouring thickness is 0.5m, and the upper layer of concrete is completed to cover the lower layer of concrete before the lower layer of concrete is initially cured;

[0065] Seventh step: continue to repeat the third-sixth steps, and it is necessary to note that the positions of the true points of different layers are staggered until the uppermost layer is poured.

[0066] Test examples 1-3 and the comparative example, and the test method is as follows:

[0067] On the 14th day after the completion of construction, use a pressure hammer to hammer the surface of the formed concrete of examples 1-3 and the comparative example, and the number of hammering points at each time is 5, the distance between adjacent two hammering points is kept above 1.5m, the hammering direction is vertical from top to bottom, and the hammering force is kept the same.

[0068] Repeat the hammering at each hammering point, and the interval time of repeated hammering is 5s, until cracks appear at the hammering point, then stop hammering, record the number of hammering times of the 5 hammering points, and finally calculate the average number of hammering times of each hammering point.

[0069] Test examples 1-3 and the comparative example according to the above method, and the test results are as follows:

[0070] The average number of hammering times of the concrete hammering points in Example 1 is 15, the average number of hammering times of the concrete hammering points in Example 2 is 15, the average number of hammering times of the concrete hammering points in Example 1 is 17, and the average number of hammering times of the concrete hammering points in the comparative example is 9.

[0071] It can be found by analyzing the test results of Examples 1-3 and the comparative example that the average number of hammering times of the concrete hammering points in Examples 1-3 is higher than that of the comparative example, and it can be inferred that the concrete construction method of the examples can make the compressive strength of the formed concrete better than that of the comparative example. By comparing the comparative example with the examples, it can be found that the step of inserting the steel bars into the vibrating points is missing in the comparative example, and thus it is reasonable to believe that inserting the steel bars into the vibrating points staggered in each layer can improve the compressive strength of the formed concrete.

[0072] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", etc. indicate the orientation or positional relationship based on the shown orientation or positional relationship, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, and a particular orientation configuration and operation, therefore, it cannot be understood as a limitation on the present application. In addition, "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0073] The above describes one embodiment of the present application in detail, but the content described is only the preferred embodiment of the present application, and cannot be considered as limiting the scope of the implementation of the present application. Any equivalent changes and improvements made in the scope of the present application should still belong to the patent coverage of the present application.

Claims

1. A method for pouring large-volume concrete, characterized in that, Includes the following steps: S1: Preparing concrete, including the following steps: (1) Prepare medium-low heat cement, medium-coarse sand, gravel with a particle size of 15-25mm and water in a mass ratio of 1:(2-3):(3-3.5):(0.5-0.6); (2) Add cement and sand to the mixer and mix evenly to form material A; (3) Add stones to material A and stir evenly to form material B; (4) Add 20-30% by weight of calcium lignosulfonate and 5-10% by weight of fly ash to water and stir evenly to obtain material C; (5) Add material C to material B while stirring until homogeneous to obtain material D; (6) Add 6-8% of the cement weight of the expansion agent to material D and stir evenly to obtain concrete; S2: Transfer the concrete to truck-mounted pump A and truck-mounted pump B; S3: The bottom layer of the foundation pit is poured in one direction using truck-mounted pump A, with a pouring thickness of 0.3 to 0.5 meters; S4: While the truck pump A is pouring concrete, a vibrator is used to vibrate the bottom layer of concrete that has been poured by the truck pump A. The vibration points are distributed in rows and columns. After each vibration, a steel bar with a length of 0.1-0.2m is inserted into the vibration point. S5: While vibrating, the second layer of concrete is poured on the bottom layer of concrete after vibration by the truck pump B, following the pouring direction of the truck pump A. The pouring thickness is 0.3-0.5m. The upper layer of concrete is covered before the lower layer of concrete sets. S6: Continue repeating steps S2-S5 until the top layer is poured. No reinforcing bars need to be inserted into the top layer of concrete.

2. The method for pouring large-volume concrete according to claim 1, characterized in that, In S1, the mud content of the medium-coarse sand is less than 1%, and the mud content of the gravel is less than 2%.

3. The method for pouring large-volume concrete according to claim 1, characterized in that, In S1, the expanding agent is a UEA composite expanding agent.

4. The method for pouring large-volume concrete according to claim 1, characterized in that, In S4, the effective radius of the vibrator is 300-350mm.

5. The method for pouring large-volume concrete according to claim 1, characterized in that, In S4, the distance between every two vibration points is 450-525mm.

6. The method for pouring large-volume concrete according to claim 1, characterized in that, In S4, the vibration points of different layers of concrete are staggered.

7. The method for pouring large-volume concrete according to claim 1, characterized in that, In S4, the diameter of the reinforcing bar is 2-3 cm.