Method for cooling large area concrete

Abstract

The application discloses a large-area concrete cooling construction method, which comprises the following construction steps: S1, construction preparation; S2, installation of a foundation; a plurality of inner water pipes are embedded in concrete respectively, outer water pipes are connected with adjacent two inner water pipes through connecting pieces, the outer water pipes are located outside the concrete, one end of a main water pipe is connected with a water outlet end of a water supply device, the other end of the main water pipe is connected with one of the outer water pipes, a water outlet pipe is used for returning cooling water in the outer water pipes to the water supply device, and a linked loop is formed; S3, pre-water supply; S4, cooling; S5, dismounting; S6, hole repairing; and S7, re-dismounting. After the cooling is completed, the inner water pipes can be taken out from the concrete after pouring, so that the problem that different expansion coefficients caused by different materials of the inner water pipes and the concrete lead to concrete cracks is effectively avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of concrete, in particular to a large-area concrete cooling construction method. BACKGROUND

[0002] Mass concrete, English is concrete in mass, the standard of mass concrete construction GB50496-2018 in our country stipulates that the mass concrete of the concrete structure object with the minimum geometric size not less than 1m, or the concrete which is expected to cause harmful cracks due to temperature change and shrinkage caused by hydration of cementitious materials in concrete, is called mass concrete.

[0003] Modern buildings often involve mass concrete construction, such as high-rise building foundation, large equipment foundation, water conservancy dam, etc. Because the cement hydration heat release is relatively concentrated, the internal temperature of the concrete rises relatively fast, when the temperature difference between the inside and outside of the concrete is large, the concrete will produce temperature cracks, which will affect the structure safety and normal use.

[0004] At present, the cooling measures for large-area concrete are to embed a plurality of water pipes in the concrete respectively, water is supplied to the plurality of water pipes, so as to cool the concrete, after cooling, the water pipes are still embedded in the concrete, because the materials of the concrete and the water pipes are different, and the thermal expansion coefficients are different, which is easy to cause cracks in the concrete, and there is a safety hazard. SUMMARY

[0005] Therefore, the present application provides a large-area concrete cooling construction method, which effectively avoids the problem of different expansion coefficients caused by different materials of water pipes and concrete, thereby causing cracks in the concrete.

[0006] The large-area concrete cooling construction method provided by the present application adopts the following technical scheme:

[0007] A large-area concrete cooling construction method comprises the following construction steps:

[0008] S1: construction preparation: prepare a plurality of inner water pipes, outer water pipes, water inlet pipes, water outlet pipes, connecting pieces and water supply devices;

[0009] S2: install the foundation: embed a plurality of inner water pipes in the concrete respectively, connect adjacent two inner water pipes through the connecting piece, the outer water pipe is located outside the concrete, one end of the main water pipe is connected with the water outlet end of the water supply device, the other end is connected with one of the outer water pipes, the water outlet pipe is used for returning the cooling water of the outer water pipe to the water supply device, forming a linked loop;

[0010] S3: pre-water supply: after the construction such as steel binding and the concealed acceptance, before pouring concrete, starting the water supply device, filling the inner water pipe and the outer water pipe with water, and then stopping the water supply;

[0011] S4: cooling: after the completion of pouring concrete and initial setting, starting the water supply device, circulating pumping water, the inner water pipe cooling the concrete, monitoring the temperature through multiple temperature measuring points on the outer surface, bottom surface and middle three elevation, adjusting the pumping rate of the water pump in real time, so as to control the cooling rate of the concrete;

[0012] S5: dismounting: after the pouring concrete cooling reaches the design value, discharging the cooling water in the inner water pipe, separating the outer water pipe leaked outside the concrete from the inner water pipe, then taking out the inner water pipe buried in the concrete, after taking out, re-connecting the outer water pipe with the pipe-shaped cavity of the concrete after dismounting the water pipe through the connecting piece, forming the same linked loop as the step S2;

[0013] S6: hole filling: using the pumping device to pressurize the cement mortar of a higher strength grade into the linked loop of the step S5 until all the pipe-shaped cavities in the mass concrete are filled;

[0014] S7: dismounting again: dismounting the outer water pipe, pouring out the cement mortar in the water pipe, and cleaning the outer water pipe and the connecting piece for recycling.

[0015] Optionally, the water pipe is an elastic plastic pipe, which is radially expandable.

[0016] Optionally, the outer surface of the inner water pipe is provided with a water filling part, the water filling part is radially expandable, the inner water pipe is in communication with the water filling part, the water filling part expands when water supply, and spontaneously shrinks after water supply.

[0017] Optionally, the connecting piece includes an inner thread nut and an outer thread nut, the inner thread nut is slidingly fitted on the outer water pipe, the outer thread nut is fixedly arranged on the inner water pipe, and the inner thread nut and the outer thread nut are threadedly connected.

[0018] Optionally, the cross section of the outer water pipe is U-shaped, and the connecting piece is arranged at both ends of the outer water pipe.

[0019] Optionally, in the step S2, the formed linked loop is a continuous S-shaped.

[0020] Optionally, the longitudinal section of the inner water pipe is C-shaped, the two ends of the inner water pipe are upward, and the outer thread nut is arranged at the two ends of the inner water pipe.

[0021] In summary, the present application has the following at least one beneficial technical effect:

[0022] 1. After the temperature is reduced, the inner water pipe can be taken out from the casted concrete, effectively avoiding the problem of concrete cracks caused by different expansion coefficients due to different materials of the water pipe and the concrete. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a large volume concrete cooling construction method according to an embodiment of the present application.

[0024] Figure 2 is a large volume concrete cooling construction method according to an embodiment of the present application.

[0025] Figure 3 is a large volume concrete cooling construction method according to an embodiment of the present application.

[0026] Figure 4 is a side view of the inner water pipe according to an embodiment of the present application.

[0027] Reference signs: 1, inner water pipe; 11, water filling part; 2, outer water pipe; 3, connecting piece; 31, inner thread nut; 32, outer thread nut. DETAILED DESCRIPTION

[0028] The following will be described in detail in combination with the accompanying drawings. Figures 1-4 The present application will be further described in detail.

[0029] An embodiment of the present application discloses a large area concrete cooling construction method.

[0030] Referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 , a large area concrete cooling construction method comprises the following construction steps:

[0031] S1: construction preparation: prepare several inner water pipes 1, outer water pipes 2, water inlet pipes, water outlet pipes, connecting pieces 3 and water supply devices;

[0032] S2: installation of foundation: embed several inner water pipes 1 in the concrete respectively, connect two adjacent inner water pipes 1 through the connecting piece 3, and locate the outer water pipe 2 outside the concrete, connect one end of the main water pipe with the water outlet end of the water supply device and the other end with one of the outer water pipes 2, and use the water outlet pipe to return the cooling water in the outer water pipe 2 to the water supply device to form a linked loop;

[0033] S3: pre-water supply: after the construction such as steel bar binding and concealed acceptance, before pouring the concrete, start the water supply device, and pause the water supply after the inner water pipe 1 and the outer water pipe 2 are filled with water;

[0034] S4: Cooling: After the concrete is poured and initially set, the water supply device is started to circulate water. The inner water pipe 1 cools the concrete. During the cooling process, the temperature is monitored by multiple temperature measuring points at three elevations: the outer surface, the bottom surface, and the middle surface. The pumping rate of the water pump is adjusted in real time to control the cooling rate of the concrete.

[0035] S5: Removal: After the concrete is cooled to the design value, drain the cooling water from the inner water pipe 1, separate the exposed outer water pipe 2 from the inner water pipe 1, then remove the inner water pipe 1 embedded in the concrete. After removal, reconnect the outer water pipe 2 to the concrete tubular cavity after the water pipe is removed through the connector 3 to form a loop that is the same as step S2.

[0036] S6: Filling holes: Use a pumping device to pressurize and pump cement mortar of a higher strength grade into the loop of step S5 until all tubular cavities in the large volume of concrete are filled.

[0037] S7: Re-dismantle: Remove the external water pipe 2, pour out the cement mortar inside this part of the water pipe, clean the external water pipe 2 and the connector 3, so that it can be recycled and reused.

[0038] The water supply device includes a water tank, a water pump, and a return pipe. The return pipe is connected to the outlet end of the external water pipe 2. The water pump is used to transport water from the water tank to the inlet end of the external water pipe 2 to realize the reuse of cooling water.

[0039] The inner water pipe 1 is made of elastic plastic pipe, which is radially expandable and contractible. The longitudinal section of the inner water pipe 1 is C-shaped, with both ends of the inner water pipe 1 facing upwards. In this embodiment, the inner water pipe 1 is pre-embedded in the concrete along the width direction of the concrete, and multiple pipes are evenly spaced along the length direction of the concrete.

[0040] The single inner water pipe 1 is in a large C-shape within the concrete, without being bent and twisted multiple times within the concrete. This facilitates construction and paves the way for the subsequent removal of the inner water pipe 1, making it easier to dismantle later. It also makes it easier to recycle and reuse, improving the efficiency of the inner water pipe 1 and saving on costs.

[0041] After being connected, the concrete internal water pipes 1 are arranged in a continuous S-shape inside, which can cover a large area of ​​the large volume of concrete that needs to be cooled. There are no technical dead corners, and it has excellent cooling effect, realizing high utilization of materials.

[0042] In this embodiment, the inner water pipe 1 is made of plastic pipe, and a water filling part 11 is coaxially arranged on the outer surface of the inner water pipe 1. The water filling part 11 is made of elastic plastic film and can expand radially. Several water holes are opened on the outer surface of the inner water pipe 1 for communicating with the water filling part 11. The water filling part 11 expands when water is supplied and spontaneously contracts after water supply ends.

[0043] When water is filled, water enters the water pipe, and the water in the water pipe enters the water filling part 11, so that the water filling part 11 expands, increases the contact area with the concrete, and improves the heat transfer cooling and temperature control effect with the concrete; after the water filling is completed, the water in the water filling part 11 flows back to the water pipe and is discharged, and the water filling part 11 shrinks, so that the water filling part 11 is separated from the poured concrete, facilitating the removal of the inner water pipe 1 from the concrete, and improving the convenience of removal.

[0044] The removed inner water pipe 1 can be reused after being cleaned outside, increasing the number of material turnovers, improving the utilization efficiency of the product, saving materials, and effectively reducing the cost input.

[0045] When the water filling part 11 is in an expanded state, the contact area between the water pipe and the concrete is increased, effectively preventing displacement of the water pipe during concrete pouring, and improving the stability of the poured concrete.

[0046] The cross section of the outer water pipe 2 is U-shaped, and the connecting pieces 3 are arranged at both ends of the outer water pipe 2. The outer water pipe 2 is used to connect two adjacent inner water pipes 1 located on the same side. The formed continuous loop is a continuous S-shaped.

[0047] The outer water pipe 2 that leaks out of the concrete can dissipate the heat of the cooling water entering the concrete, further improving the heat dissipation effect.

[0048] After the cooling water absorbs heat in the concrete inner water pipe 1, it exchanges heat with the external environment through the outer water pipe 2 to dissipate heat, which can cool the condensed water. The cooled cooling water enters the concrete inner water pipe 1 again to absorb the heat of the concrete, and the cycle is repeated, so that the cooling water can exchange heat with the concrete multiple times, greatly improving the cooling effect of the cooling water on the interior of the concrete, improving the work efficiency of the concrete cooling, saving the cooling work time, and shortening the construction period.

[0049] In this embodiment, the connecting piece 3 includes an inner threaded nut 31 and an outer threaded nut 32, the inner threaded nut 31 is slidingly fitted on the outer water pipe 2, the outer threaded nut 32 is fixedly arranged on the inner water pipe 1, and the inner threaded nut 31 and the outer threaded nut 32 are threadedly connected.

[0050] The detachable threaded connection device can form a continuous passage in two times, can provide a cooling water circulation system and a cement mortar pumping passage, effectively avoiding the complicated work of separately injecting water and grouting for multiple water pipes, ensuring that only one water injection and grouting port is needed to achieve the effect of completing water injection and grouting as a whole, greatly improving the work efficiency and saving labor costs. At the same time, the same material can realize the functions of water injection and grouting, fully utilize the performance of the material, improve the utilization rate of the material, and reduce the cost input.

[0051] In step S5, the outer water pipe 2 is re-fixed in the cavity formed by the poured concrete, a short pipe with an external thread nut 32 is preset at the cavity position, the outer water pipe 2 is screwed with the external thread nut 32, and the outer water pipe 2 and the short pipe are taken out immediately after the cavity is filled.

[0052] After the cooling and grouting work is completed, all the devices can be removed and recycled conveniently, and can be used again after cleaning, so as to ensure the turnover use times of the equipment, improve the utilization efficiency of the equipment, save the cost, and reduce the investment. Meanwhile, no plastic water pipe and other materials are left in the concrete body, the inconsistent expansion and shrinkage between the water pipe and the concrete caused by different expansion coefficients is avoided, stress and cracks are generated, the concrete is directly contacted with the grouting in the tubular cavity, the integrity and the gripping force of the concrete are improved, the higher mechanical effect is ensured, and the performance requirements of the mass concrete are maximized.

[0053] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, therefore: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A method for cooling large-area concrete, characterized in that: The construction steps include the following: S1: Construction preparation: Prepare several internal water pipes, external water pipes, inlet pipes, outlet pipes, connectors, and water supply devices; S2: Installation foundation: Multiple inner water pipes are pre-embedded in concrete. The outer water pipes are connected to adjacent inner water pipes through connectors. The outer water pipes are located outside the concrete. One end of the main water pipe is connected to the outlet of the water supply device, and the other end is connected to one of the outer water pipes. The outlet pipe is used to return the cooling water of the outer water pipes to the water supply device, forming a loop. S3: Pre-supply water: After the steel reinforcement binding construction and concealed acceptance, and before the concrete pouring, start the water supply device to fill the inner and outer water pipes with water and then stop the water supply. S4: Cooling: After the concrete is poured and initially set, the water supply device is started to circulate water and the inner water pipe cools the concrete. During the cooling process, the temperature is monitored by multiple temperature measuring points at three elevations: the outer surface, the bottom surface, and the middle surface. The pumping rate of the water pump is adjusted in real time to control the cooling rate of the concrete. S5: Removal: After the concrete is cooled to the design value, drain the cooling water from the inner water pipe, separate the exposed outer water pipe from the inner water pipe, then remove the inner water pipe embedded in the concrete. After removal, reconnect the outer water pipe to the concrete tubular cavity after the water pipe is removed through the connector, forming a loop similar to step S2. S6: Filling holes: Use a pumping device to pressurize and pump cement mortar of a higher strength grade into the loop of step S5 until all tubular cavities in the large volume of concrete are filled. S7: Re-dismantle: Remove the external water pipe, pour out the cement mortar inside this part of the water pipe, clean the external water pipe and connectors for recycling and reuse; The inner water pipe is made of plastic, and a water filling part is coaxially arranged on the outer surface of the inner water pipe. The water filling part is made of elastic plastic film and can expand radially. Several water holes are opened on the outer surface of the inner water pipe for communication with the water filling part. The water filling part expands when water is supplied and automatically contracts after water supply ends. The longitudinal section of the inner water pipe is C-shaped, and both ends of the inner water pipe face upwards.

2. The method for large-area concrete cooling construction according to claim 1, characterized in that: The connector includes an internal thread nut and an external thread nut. The internal thread nut is slidably fitted on the external water pipe, and the external thread nut is fixedly fitted on the internal water pipe. The internal thread nut and the external thread nut are threadedly connected.

3. The method for large-area concrete cooling construction according to claim 1, characterized in that: The external water pipe has a U-shaped cross-section, and the connectors are respectively located at both ends of the external water pipe.

4. The method for large-area concrete cooling construction according to claim 1, characterized in that: In step S2, the resulting loop is a continuous S-shape.

5. The method for large-area concrete cooling construction according to claim 2, characterized in that: The external threaded nuts are respectively installed at both ends of the internal water pipe.

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