Massive concrete pouring construction method

Abstract

The application discloses a mass concrete pouring construction method, before pouring, a control line is arranged above the mass concrete, the control line is a continuous broken line, the starting point and the ending point of the control line are located on a pair of diagonal corners of the pouring area respectively, the two ends of each broken line segment are located on a pair of long sides of the pouring area respectively, and adjacent broken line segments are symmetrical about the width direction of the pouring area; during pouring, two sets of pouring equipment are used to start continuous pouring at the same pouring speed. The method realizes gradual pouring with the smallest paving area, pours as quickly as possible to the design elevation, solves the problems of insufficient supply strength of the mass concrete and early setting caused by long-time exposure, realizes continuous pouring of the mass concrete, and achieves the effect of effectively controlling the generation of construction cold joints.

Description

TECHNICAL FIELD

[0001] The present application relates to concrete pouring construction, in particular to a mass concrete pouring construction method. BACKGROUND

[0002] Mass concrete refers to a large amount of concrete whose smallest geometric size is not less than 1m, or concrete which is expected to cause harmful cracks due to temperature changes and shrinkage caused by hydration of cementitious materials in the concrete. The current mass concrete pouring method has two types: whole layered pouring and push-type continuous pouring, wherein:

[0003] Whole layered pouring is to divide the whole mass concrete member into several layers with small thickness, pour one layer completely, then pour the layer above, and repeat the construction until the pouring is completed to the design elevation of the concrete structure. This pouring method makes the whole mass concrete structure into layered structure, and there are gaps between layers, which easily causes leakage risk and affects the strength of the mass concrete structure.

[0004] Push-type continuous pouring is also divided into several layers, but each layer is not completely poured to the end. After pouring a part of the next layer, the layer above is poured back, and the pouring point is constantly moved forward. The concrete in front of the pouring point naturally flows into an inclined plane to gradually form a stepped pouring level, and the concrete behind the pouring point is poured to the design elevation. This pouring method has a large paving area, and the surface area that is not completely poured is too large. It is easy to cause construction cold joints and leakage problems due to insufficient concrete supply strength or external factors such as traffic control, which cannot complete the pouring of the upper layer of concrete before the initial setting of the lower layer of concrete. SUMMARY

[0005] In view of the problems that the current mass concrete pouring method is easy to have gaps between layers or easy to produce construction cold joints, the purpose of the present application is to provide a mass concrete pouring construction method to gradually pour with as small a paving area as possible and to pour as quickly as possible to the design elevation, solve the problems of insufficient concrete supply strength and premature setting due to long-time exposure, realize continuous pouring of mass concrete, and achieve the effect of effectively controlling the production of construction cold joints.

[0006] The technical solution adopted by the present application is:

[0007] A mass concrete pouring construction method for a rectangular pouring area:

[0008] Before pouring, a control line is set above it: the control line is a continuous broken line, the starting point and the ending point of the whole line are located on a pair of diagonal corners of the pouring area respectively, the two ends of each broken line segment are located on a pair of long sides of the pouring area respectively, the adjacent broken line segments are symmetrical about the width direction of the pouring area, and the control line sequentially separates the pouring area into A1, B1, A2, B2, …, An, Bn in the length direction, wherein one corner of A1 and B1 intersects at the starting point of the control line and A1 < B1, and one corner of An and Bn intersects at the ending point of the control line and An > Bn.

[0009] When pouring, two sets of pouring equipment are used to start continuous pouring at the same pouring speed: one set of pouring equipment sequentially completes the pouring of A1, A2, …, An from the starting point of the control line, and each small area is pushed forward along the travel path of the current broken line segment in the way of oblique layer pouring, and the other set of pouring equipment sequentially completes the pouring of B1, B2, …, Bn from the starting point of the control line, and each small area is pushed forward along the travel path of the current broken line segment in the way of oblique layer pouring.

[0010] Further, for irregular pouring areas, most of the areas are divided into several rectangular pouring areas for the above pouring, and the remaining small areas are poured by conventional pouring.

[0011] Further, before setting the control line, the steel bar installation in the pouring area is completed.

[0012] Further, the method of setting the control line is: first, fix the positioning steel bars equidistantly on the upper steel bar surface of the pouring area, and the steel bars are higher than the design elevation of the pouring area, then select a plurality of positioning steel bars on a pair of long sides of the pouring area as attachment points, and install cloth or wire along the line on the selected positioning steel bars to form the control line.

[0013] Further, when pouring, a standby pouring equipment is prepared, and when the working pouring equipment stops working due to a reason, the standby pouring equipment is timely put into use to complete the remaining work.

[0014] Further, when pouring, the slump of the mass concrete mixture is not greater than 180 mm, and the thickness of each layer in the oblique layer pouring is 500 mm.

[0015] Further, when pouring, the cloth feeding process of synchronous pouring and vibrating, simultaneous retreating, layer piling, and gradual topping is adopted, and the vibration of each layer of concrete is carried out on the naturally formed slope surface.

[0016] Further, when pouring, the vibration moving distance is not greater than 1.5 times the vibration radius, the vibration equipment is inserted into the lower layer of concrete by 50-100 mm, and the pouring and vibration are carried out in two to three times to avoid missed vibration and affect the construction quality of the concrete.

[0017] Further, the pouring molding is followed by heat preservation and curing.

[0018] Further, the spraying curing work is immediately carried out before the initial setting of the concrete; the moisture curing is carried out within 6-12 hours after the pouring molding of the concrete; the top surface of the concrete is covered and watered for moisture curing, so that the surface of the concrete is kept wet all the time, and the surface shrinkage cracks are avoided; if the surface temperature of the concrete rises too fast, the water storage method is adopted for curing; if the temperature drop rate is too fast after the temperature rise peak, the covering heat preservation is adopted, and the on-site temperature is monitored; the duration of the moisture curing is not less than 14 days; after the curing, the heat preservation covering layer is removed when the maximum temperature difference between the surface of the concrete and the environment is less than 20 DEG C.

[0019] The beneficial effects of the present application are:

[0020] The control line divides the rectangular pouring area into A and B two parts and the areas of the two parts are basically consistent; in the case that the pouring speed is the same and the pouring path is the same as the running path of the current polyline segment, the two sets of pouring equipment will start pouring from the starting point of the control line and end pouring at the ending point of the control line; in the pouring process, since A1 BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a schematic view of the control line set for the rectangular pouring area in the embodiment of the present application.

[0022] Figure 2 is a schematic view of the control line in the embodiment of the present application which sequentially divides the pouring area into a plurality of small areas in the length direction.

[0023] Figure 3 is a pouring route map of the A area in the embodiment of the present application.

[0024] Figure 4 is a pouring route map of the B area in the embodiment of the present application.

[0025] Figure 5 is a relationship diagram of the pouring area and the pouring time in the embodiment of the present application.

[0026] Figure 6 is the pouring profile in the embodiment of the present application.

[0027] In the figure: 1-positioning steel bar; 2-control line. DETAILED DESCRIPTION

[0028] The present application will be further described below in conjunction with the accompanying drawings and embodiments.

[0029] A mass concrete pouring construction method, aiming at a rectangular pouring area, adopts the following steps:

[0030] S1, complete steel bar installation in the pouring area

[0031] S2, before pouring, set a control line 2 above it

[0032] As shown in Figure 1 and Figure 2 , the control line 2 is a continuous broken line, the starting point and the ending point of the whole are located on a pair of diagonal opposite corners of the pouring area respectively, the two ends of each broken line segment are located on a pair of long sides of the pouring area respectively, and adjacent broken line segments are symmetric about the width direction of the pouring area. The pouring area is sequentially divided into A1, B1, A2, B2, …, An, Bn in the length direction by the control line 2, wherein one corner of A1 and B1 intersects at the starting point of the control line 2 and A1 < B1, and one corner of An and Bn intersects at the ending point of the control line 2 and An > Bn.

[0033] As shown in Figure 1 , the method of setting the control line 2 is: first fix the positioning steel bars 1 on the upper layer of the steel bar surface of the pouring area at equal intervals, and the steel bars are higher than the design elevation of the pouring area, then select a number of positioning steel bars 1 on a pair of long sides of the pouring area as attachment points, and install cloth or line along the selected positioning steel bars 1 to form the control line 2.

[0034] S3, when pouring, two sets of pouring equipment start to continuously pour at the same pouring speed at the same time

[0035] As shown in Figure 3 , Figure 5 and Figure 6 , one set of pouring equipment starts from the starting point of the control line 2 to complete the pouring of A1, A2, …, An in turn and each small area advances forward along the travel path of the current broken line segment in the way of oblique layered pouring, as shown in Figure 4 , Figure 5 and Figure 6 , the other set of pouring equipment starts from the starting point of the control line 2 to complete the pouring of B1, B2, …, Bn in turn and each small area advances forward along the travel path of the current broken line segment in the way of oblique layered pouring.

[0036] Pouring, ready for standby pouring equipment, when the working pouring equipment is stopped for some reason, the standby pouring equipment is put into operation in time to complete the remaining work.

[0037] Pouring, the slump of the mass concrete mixture is not more than 180 mm, and the thickness of each layer is 500 mm when using oblique layering pouring.

[0038] Pouring, the synchronous pouring, simultaneous retreat, layering, and gradual topping-out delivery process is used, as shown in Figure 6 , and each layer of concrete is vibrated on the naturally formed slope.

[0039] Pouring, the vibration moving distance is not more than 1.5 times the vibration radius, the vibrating equipment is inserted into the lower layer of concrete by 50-100 mm, and the pouring is divided into two to three times to avoid missing vibration and affect the construction quality of the concrete.

[0040] S4, after pouring and forming, the temperature maintenance and curing are performed

[0041] Immediately after the initial setting of the concrete, the spraying curing work is performed; within 6-12 hours after the concrete is poured and formed, the moisture curing is performed: the top surface of the concrete is covered and watered for moisture curing, so that the surface of the concrete is always kept wet to avoid surface shrinkage cracks; if the surface temperature of the concrete rises too fast, the water storage method is used for curing; if the temperature drop rate is too fast after the temperature rise peak, the covering and temperature maintenance are performed, and the on-site temperature is monitored at the same time; the duration of the moisture curing is not less than 14 days, and after the curing, the covering layer is removed when the maximum temperature difference between the surface of the concrete and the environment is less than 20℃.

[0042] According to the above scheme, it can be known that:

[0043] The control line 2 divides the rectangular pouring area into A and B two parts, and the areas of the two parts are basically the same. In the case that the pouring speed is the same and the pouring path is the same as the current line segment path, the two sets of pouring equipment will start pouring from the starting point of the control line 2 and end pouring at the ending point of the control line 2. During the pouring process, since A1 < B1, A1 will be poured first and then will be poured around to pour A2, so as to form a closed area for B1 and reduce the concrete paving area in the B1 area. Similarly, B1 will be poured first and then will be poured around to pour B2, so as to form a closed area for A2 and reduce the concrete paving area in the A2 area. According to this condition, the remaining pouring is sequentially performed, the concrete in the A and B areas is cooperatively advanced, and is complemented with each other, so as to sequentially and gradually pour with the smallest paving area, to pour as quickly as possible to the design elevation, to solve the problems of insufficient supply strength of the mass concrete and early setting due to long-time exposure, to realize the continuous pouring of the mass concrete, and to achieve the effect of effectively controlling the generation of construction cold joints.

[0044] For irregular pouring area, most of its area can be divided into several rectangular pouring areas for the above pouring, and the small part of the area is poured by conventional pouring. The above described embodiments are part of the embodiments of the present application, not all. The detailed description of the embodiments of the present application is not intended to limit the scope of the application claimed, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

Claims

1. A mass concrete placement method, characterized by, For a rectangular pouring area: Before pouring, a control line is set above it: the control line is a continuous broken line, the starting point and the ending point of which are located on a pair of diagonal corners of the pouring area respectively, the two ends of each broken line segment are located on a pair of long sides of the pouring area respectively, and adjacent broken line segments are symmetrical about the width direction of the pouring area. The control line sequentially separates the pouring area into A1, B1, A2, B2,..., An, Bn in the length direction, wherein one corner of A1 and B1 intersects at the starting point of the control line and A1 < B1, one corner of An and Bn intersects at the ending point of the control line and An > Bn; During pouring, two sets of pouring equipment are used to start continuous pouring at the same pouring speed: one set of pouring equipment sequentially completes the pouring of A1, A2,..., An from the starting point of the control line, and each small area is pushed forward along the current broken line segment in a diagonal layered pouring manner; the other set of pouring equipment sequentially completes the pouring of B1, B2,..., Bn from the starting point of the control line, and each small area is pushed forward along the current broken line segment in a diagonal layered pouring manner.

2. The mass concrete placement construction method according to claim 1, characterized by: Before setting the control line, the steel bar installation in the pouring area is completed.

3. The mass concrete placement construction method according to claim 2, characterized by, The method of setting the control line is: first, fix the positioning steel bars at equal intervals on the upper steel bar surface of the pouring area, and the steel bars are higher than the design elevation of the pouring area, then select a number of positioning steel bars on a pair of long sides of the pouring area as attachment points, and install cloth or line along the selected positioning steel bars to form the control line.

4. The mass concrete placement construction method as claimed in claim 1, characterized by: During pouring, a standby pouring equipment is prepared, and when the working pouring equipment stops due to reasons, the standby pouring equipment is put into operation in time to complete the remaining work.

5. The mass concrete placement construction method as claimed in claim 1, characterized by: During pouring, the slump of the mass concrete mixture is not greater than 180 mm, and the thickness of each layer in the diagonal layered pouring is 500 mm.

6. The mass concrete placement construction method as claimed in claim 1, characterized by: During pouring, the cloth feeding process of synchronous pouring and vibrating, simultaneous retreating, layered accumulation, and gradual topping is adopted, and the vibration of each layer of concrete is performed on the naturally formed slope surface.

7. The mass concrete placement construction method as claimed in claim 1, characterized by: During pouring, the vibration moving distance is not greater than 1.5 times the vibration radius, the vibration equipment is inserted into the lower layer of concrete by 50-100 mm, and the pouring is performed in two to three times to avoid missed vibration and affect the construction quality of the concrete.

8. The mass concrete placement construction method as claimed in claim 1, characterized by: After pouring and forming, the temperature maintenance and curing are performed.

9. The mass concrete placement construction method according to claim 8, characterized by: Before the initial setting of the concrete, the spray curing work is immediately performed; within 6-12 hours after the pouring and forming of the concrete, the moisture curing is performed: the top surface of the concrete is covered and water is sprayed for moisture curing, so that the surface of the concrete is always kept wet to avoid surface shrinkage cracks, if the surface temperature of the concrete rises too fast, the water storage method is adopted for curing, if the temperature drop rate is too fast after the temperature rise peak, the covering and temperature maintenance are adopted, and the on-site temperature is monitored at the same time; the duration of the moisture curing is not less than 14 days, and after the curing, the temperature covering layer is removed when the maximum temperature difference between the surface of the concrete and the environment is less than 20℃.

10. A method of mass concrete placement construction, characterized by: For irregular pouring areas, most of the areas are separated into a plurality of rectangular pouring areas for pouring construction according to the mass concrete pouring construction method of any one of claims 1 to 9, and the remaining small areas are poured by using the conventional pouring method.

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