CN108532606B - Temperature control method for mass concrete - Google Patents
Temperature control method for mass concrete Download PDFInfo
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- CN108532606B CN108532606B CN201810367873.4A CN201810367873A CN108532606B CN 108532606 B CN108532606 B CN 108532606B CN 201810367873 A CN201810367873 A CN 201810367873A CN 108532606 B CN108532606 B CN 108532606B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/24—Safety or protective measures preventing damage to building parts or finishing work during construction
- E04G21/246—Safety or protective measures preventing damage to building parts or finishing work during construction specially adapted for curing concrete in situ, e.g. by covering it with protective sheets
Abstract
The invention discloses a temperature control method of mass concrete, which comprises the following steps: 1. arranging a first cooling water pipe network, a second cooling water pipe network and a third cooling water pipe network in sequence at intervals from top to bottom in a horizontal layer in a cushion cap, wherein the first cooling water pipe network and the third cooling water pipe network are longitudinally arranged, and the second cooling water pipe network is transversely arranged; 2. arranging temperature measuring points; 3. and controlling the temperature of the concrete. The arrangement mode and the temperature control method of the cooling water system are designed according to the temperature distribution condition inside the large-volume concrete, so that the temperature difference inside and outside the concrete can be effectively reduced, the temperature stress is reduced, and the concrete is prevented from cracking; in addition, the cooling water pipes are connected through rubber joints, so that the connection is firmer, and the rigid cooling water pipes can be prevented from being damaged due to expansion with heat and contraction with cold to influence the heat exchange effect.
Description
Technical Field
The invention relates to the field of concrete construction. More particularly, the present invention relates to a method for temperature control of bulk concrete.
Background
In mass concrete, temperature stress in the mass concrete is one of the most common reasons for causing the self-cracking of the concrete, and particularly in the construction period of the mass concrete, the concrete is hydrated to form a large amount of heat, and if the heat cannot be effectively and uniformly radiated, larger temperature stress is formed, so that the concrete cracks to cause quality accidents. Therefore, the quality of the temperature control of the mass concrete directly influences the construction quality of the mass concrete, which is the key point of the construction quality control of the mass concrete, and particularly for the mass concrete bearing load, the concrete temperature control is the primary task.
At present, the heat dissipation cooling water pipe is embedded inside the mass concrete to dissipate heat generated by hydration of the concrete. However, the cooling water pipes are uniformly arranged at present, the temperature distribution condition inside the concrete block is not considered, although the temperature inside the concrete can be controlled to fall, and the temperature difference inside and outside the concrete is reduced, due to the difference of heat dissipation effects, the temperature of the central part of the concrete is high, the boundary temperature is lower, the temperature difference inside the concrete can not be effectively reduced by arranging the water pipes at equal intervals, the temperature difference inside the concrete still generates unfavorable temperature stress, and the concrete has larger destructive power. Concrete is easy to generate large temperature stress under the action of a hydrothermal temperature field.
Disclosure of Invention
The invention aims to provide a reasonable cooling water pipe arrangement system and a method for regulating and controlling the temperature of mass concrete, so that the temperature rise of the mass concrete after pouring can be effectively regulated and controlled, and the cracking of the mass concrete due to large internal temperature stress can be avoided.
To achieve these objects and other advantages in accordance with the purpose of the invention, a method for temperature control of mass concrete is provided, which comprises the steps of:
step one, arranging a cooling water system: cooling water systems are distributed in the bearing platform in a layered mode, and each cooling water system comprises a first cooling water pipe network, a second cooling water pipe network and a third cooling water pipe network which are sequentially distributed in different horizontal planes of the bearing platform at intervals from top to bottom;
the first cooling water pipe network comprises a first cooling water pipe which is longitudinally arranged in the bearing platform, two ends of the first cooling water pipe are respectively provided with a first water inlet and a first water outlet, and the first cooling water pipe is a coil-like pipe;
the second cooling water pipe network comprises a second cooling water pipe and a third cooling water pipe which share a second water inlet and a second water outlet, the second cooling water pipe and the third cooling water pipe respectively comprise a water inlet section, an intermediate section and a water outlet section which are sequentially connected, wherein the water inlet section and the intermediate section of the second cooling water pipe are similar to a coiled pipe, the water outlet section is a straight pipe, the water inlet section of the third cooling water pipe is a straight pipe, the intermediate section and the water outlet section are similar to a coiled pipe, the intermediate section of the second cooling water pipe and the intermediate section of the third cooling water pipe are arranged in a staggered mode, the water inlet section of the third cooling water pipe is arranged outside the arrangement area of the second cooling water pipe, and the water outlet section of the second cooling water pipe is arranged outside the arrangement area of the third;
the third cooling water pipe network comprises a fourth cooling water pipe which is longitudinally arranged in the bearing platform, a third water inlet and a third water outlet are respectively arranged at the two ends of the fourth cooling water pipe, and the fourth cooling water pipe is a coil-like pipe;
step two, arranging temperature measuring points: temperature sensors are arranged at the second water inlet and the second water outlet; surface, middle and bottom temperature measuring points are arranged in the bearing platform, and temperature sensors are respectively arranged at the temperature measuring points and are respectively used for detecting the temperature of the surface concrete, the temperature of the inner concrete and the temperature of the bottom concrete;
step three, controlling the temperature of the concrete, comprising the following steps:
s1: the first water inlet and the third water inlet are communicated with a second water outlet, and cooling water is introduced into a cooling water system from the second water inlet and flows out of the cooling water system from the first water outlet and the third water outlet respectively;
s2: controlling the water inlet temperature of the second cooling water pipe network to enable the temperature difference between the water temperature at the second water inlet and the internal concrete to be 23-25 ℃;
s3: when the temperature difference between the second water inlet and the second water outlet reaches 5 ℃, disconnecting the first water inlet and the third water inlet from the second water outlet, communicating the first water outlet and the third water outlet with the second water inlet, introducing cooling water into a cooling water system from the second water outlet, and respectively flowing out of the cooling water system from the first water inlet and the third water inlet;
s4: when the difference between the temperature of the internal concrete and the temperature of the surface concrete is 17-20 ℃, the water supply is stopped.
Preferably, the cooling water pipes of the cooling water system are all seamless steel pipes with the diameter of 32 multiplied by 2.5 mm.
Preferably, the distance from the first cooling water pipe network to the top surface of the bearing platform is 0.5-1.0 m, the distance from the third cooling water pipe network to the bottom surface of the bearing platform is 0.5-1.0 m, the vertical distance between the cooling water pipe networks in adjacent layers is 1.0-1.5 m, the horizontal distance between adjacent water pipes of the same cooling water pipe is 0.5-1.0 m, the distance between the outermost water pipe and the nearest edge of the concrete is 0.3-0.7 m, and all water inlets and water outlets are vertically led out of the top surface of the concrete by more than 0.5 m.
Preferably, the detection period of each temperature sensor is 15 min/time.
Preferably, the water inlet section and the water outlet section of the second cooling water pipe and the third cooling water pipe are respectively provided with a flow regulating valve and a flow detection device, and the flow of cooling water in the second cooling water pipe and the flow of cooling water in the third cooling water pipe are both 20-35L/min by regulating the flow regulating valves.
Preferably, the junction of two sections condenser tube leaves the space to connect through rubber joint, rubber joint includes sleeve pipe and rubber tube, and the outer wall of two sections condenser tube is located to the both ends cover respectively of rubber tube, and the sleeve pipe cover is located outside the rubber tube, and sheathed tube both ends are equipped with a pair of go-between on its inner wall, the inner wall of go-between with respectively with a pair of condenser tube's outer wall threaded connection, be equipped with a pair of rand along circumference between sheathed tube inner wall and the outer wall of rubber tube, the both ends of rubber tube respectively the butt between the inner wall of a pair of rand and condenser tube.
Preferably, the clamping ring is a plurality of circular arcs which can be combined into a ring, a groove is formed in the outer side surface of each clamping ring, one end of the fastening bolt is embedded in the groove, a through hole is formed in the sleeve, threads matched with the fastening bolt are machined on the inner wall of the through hole, and the other end of the fastening bolt penetrates through the through hole and is located outside the sleeve.
Preferably, sealing rings are arranged between the two ends of the rubber pipe and the outer wall of the cooling water pipe.
The invention at least comprises the following beneficial effects:
1. the cooling water system is reasonable in design, the temperature of the central part of the concrete which is just poured is high, the boundary temperature is low, in order to reduce the temperature stress, the cooling water system is divided into a plurality of layers of cooling water pipe networks, cooling water is introduced from a second cooling water pipe network positioned in a middle layer and flows out from a first cooling water pipe network positioned in a top layer and a third cooling water pipe network positioned in a bottom layer respectively, the heat exchange of the cooling water pipe network in the middle layer is faster than that of the cooling water pipe network in the top layer and that of the bottom layer, and the temperature difference between the internal concrete and the surface concrete and the temperature difference between the internal concrete and the bottom; when the air temperature is low, the heat of the internal concrete can be transferred to the surface concrete and the bottom surface concrete, and the heat preservation effect is achieved on the surface concrete and the ground concrete;
2. in the cooling water system, the second cooling water pipe network positioned in the middle layer comprises the second cooling water pipe and the third cooling water pipe, the middle parts of the second cooling water pipe and the third cooling water pipe are arranged in a staggered mode, namely the second cooling water pipe network and the third cooling water pipe network are densely distributed at the position close to the center and can take away more heat, and the second cooling water pipe network is sparse at the position close to the boundary, so that the arrangement mode is favorable for reducing the temperature stress of the central concrete and the boundary concrete according to the distribution characteristic of high temperature at the central position of the;
3. the cooling water system adopts a multi-layer arrangement mode of cooling water pipe networks, and the cooling water pipe networks of two adjacent layers are respectively transversely arranged and longitudinally arranged, so that the heat exchange in the concrete is uniform;
4. the two sections of cooling water pipes are connected by the rubber joint, so that the connection is firmer, and the rubber pipe in the rubber joint has good telescopic performance, so that the rigid cooling water pipe can be prevented from being damaged due to expansion caused by heat and contraction caused by cold, and the cooling effect of a cooling water system is further influenced.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a view showing the arrangement of a first chilled water piping network according to the present invention;
FIG. 2 is a view showing the arrangement of a second chilled water piping network according to the present invention;
FIG. 3 is a view showing the arrangement of a third cooling water piping network according to the present invention;
FIG. 4 is a structural view of a rubber joint according to the present invention;
fig. 5 is a layout view of a cooling water system described in comparative example 1.
Description of reference numerals:
1-a first cooling water pipe network; 11-a first cooling water pipe; 12-a first water inlet; 13-a first water outlet; 2-a second cooling water pipe network; 21-a second cooling water pipe; 22-a third cooling water pipe; 23-a second water inlet; 24-a second water outlet; 3-a third cooling water pipe network; 31-a fourth cooling water pipe; 32-a third water inlet; 33-a third water outlet; 4-a cooling water pipe; 41-a cannula; 42-rubber tube; 43-a collar; 44-fastening bolts; 45-sealing ring; 46-a connecting ring; 51-a water inlet; 52-water outlet.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials, if not otherwise specified, are commercially available; in the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
As shown in fig. 1 to 4, the present invention provides a temperature control method for mass concrete, which comprises the following steps:
step one, arranging a cooling water system: arranging cooling water systems in a horizontal layering manner in the bearing platform, wherein the cooling water systems comprise a first cooling water pipe network 1, a second cooling water pipe network 2 and a third cooling water pipe network 3 which are sequentially arranged in different floor surfaces of the bearing platform at intervals from top to bottom;
the first cooling water pipe network 1 comprises a first cooling water pipe 11 which is longitudinally arranged in the bearing platform, two ends of the first cooling water pipe are respectively provided with a first water inlet 12 and a first water outlet 13, and the first cooling water pipe 11 is a coil-like pipe;
the second cooling water pipe network 2 comprises a second cooling water pipe 21 and a third cooling water pipe 22 which share a second water inlet 23 and a second water outlet 24, the second cooling water pipe 21 and the third cooling water pipe 22 respectively comprise a water inlet section, a middle section and a water outlet section which are sequentially connected, wherein the water inlet section and the middle section of the second cooling water pipe 21 are similar-serpentine pipes, the water outlet section is a straight pipe, the water inlet section of the third cooling water pipe 22 is a straight pipe, the middle section and the water outlet section are similar-serpentine pipes, the middle section of the second cooling water pipe 21 and the middle section of the third cooling water pipe 22 are arranged in a staggered mode, the water inlet section of the third cooling water pipe 22 is arranged outside the arrangement area of the second cooling water pipe 21, and the water outlet section of the second cooling water pipe 21 is arranged outside the arrangement area of the third cooling water pipe;
the third cooling water pipe network 3 comprises a fourth cooling water pipe 31 which is longitudinally arranged in the bearing platform, a third water inlet 32 and a third water outlet 33 are respectively arranged at two ends of the fourth cooling water pipe 31, and the fourth cooling water pipe 31 is a similar serpentine pipe;
step two, arranging temperature measuring points: temperature sensors are arranged at the second water inlet 23 and the second water outlet 24; surface, middle and bottom temperature measuring points are arranged in the bearing platform, and temperature sensors are respectively arranged at the temperature measuring points and are respectively used for detecting the temperature of the surface concrete, the temperature of the inner concrete and the temperature of the bottom concrete;
step three, controlling the temperature of the concrete, comprising the following steps:
s1: the first water inlet 12 and the third water inlet 32 are communicated with the second water outlet 24, cooling water is introduced into the cooling water system from the second water inlet 23, and flows out of the cooling water system from the first water outlet 13 and the third water outlet 33 respectively;
s2: controlling the water inlet temperature of the second cooling water pipe network 2 to enable the temperature difference between the water temperature at the second water inlet 23 and the internal concrete to be 23-25 ℃;
s3: when the temperature difference between the second water inlet 23 and the second water outlet 24 reaches 5 ℃, disconnecting the first water inlet 12 and the third water inlet 32 from the second water outlet 24, communicating the first water outlet 13 and the third water outlet 33 with the second water inlet 23, introducing cooling water into a cooling water system from the second water outlet 24, and respectively flowing out of the cooling water system from the first water inlet 12 and the third water inlet 32;
s4: when the difference between the temperature of the internal concrete and the temperature of the surface concrete is 17-20 ℃, the water supply is stopped.
In the above technical scheme:
step one, arranging cooling water systems in a horizontal layer in a bearing platform, wherein the cooling water systems comprise a first cooling water pipe network 1, a second cooling water pipe network 2 and a third cooling water pipe network 3 which are sequentially arranged in different floor surfaces of the bearing platform at intervals from top to bottom, the first cooling water pipe network 1 is close to the surface of concrete, the second cooling water pipe network 2 is located at the central part of the concrete, the third cooling water pipe network 3 is close to the bottom surface of the concrete, the temperature distribution of the mass concrete is higher and is not easy to dissipate heat when being close to the central part, in order to reduce the temperature stress between the central concrete and the surrounding concrete, the second cooling water pipe network 2 located in the middle layer is arranged to be denser than the first cooling water pipe network 1 and the third cooling water pipe network 3, the second cooling water pipe network 2 comprises a second cooling water pipe 21 and a third cooling water pipe 22, and the second cooling water pipe network 23 and the third cooling water pipe network share a second water inlet 23 and a second water outlet, the middle parts of the two are staggered, so that better cooling effect on the central concrete can be achieved; the first cooling water pipe network 1 and the third cooling water pipe network 3 are longitudinally arranged, and the second cooling water pipe network 2 is transversely arranged, so that the horizontal projections of the cooling water pipes in different floor surfaces are in a cross structure, the heat exchange in the concrete can be more uniform, and blank areas are avoided; in the preferred technical scheme, the arrangement positions of the first water inlet 12 and the third water inlet 32 are in a straight line with the second water outlet 24 in the vertical direction, and the arrangement positions of the first water outlet 13 and the third water outlet 33 are in a straight line with the second water inlet 23 in the vertical direction, so that the water inlet and outlet modes can be conveniently adjusted in the subsequent temperature control process;
step two, arranging temperature measuring points: temperature sensors are arranged at the second water inlet 23 and the second water outlet 24 and are respectively used for detecting the water temperature at the second water inlet 23 and the water temperature at the second water outlet 24; surface, middle and bottom temperature measuring points are arranged in the bearing platform, and temperature sensors are respectively arranged at the temperature measuring points and are respectively used for detecting the temperature of the surface concrete, the temperature of the inner concrete and the temperature of the bottom concrete;
step three, controlling the temperature of the concrete: after concrete pouring is finished, because the temperature of the internal concrete is higher than that of the surface concrete and the bottom concrete, cooling water is introduced into the cooling water system from the second cooling water pipe network 2 and flows out of the first cooling water pipe network 1 and the third cooling water pipe network 3 respectively, and the water inlets and the water outlets of the second cooling water pipe network 2 are exchanged regularly according to the temperature difference between the second water inlets 23 and the second water outlets 24, the water flow direction in the whole cooling water system is changed simultaneously, and the large temperature difference generated in the concrete is prevented.
In another technical scheme, the cooling water pipes of the cooling water system are all seamless steel pipes with the diameter of 32 multiplied by 2.5 mm.
In another technical scheme, the distance from the first cooling water pipe network 1 to the top surface of the bearing platform is 0.5-1.0 m, the distance from the third cooling water pipe network 3 to the bottom surface of the bearing platform is 0.5-1.0 m, the vertical distance between the cooling water pipe networks in adjacent layers is 1.0-1.5 m, the horizontal distance between adjacent water pipes of the same cooling water pipe is 0.5-1.0 m, the distance between the outermost water pipe and the nearest edge of the concrete is 0.3-0.7 m, and all water inlets and water outlets are vertically led out of the top surface of the concrete by more than 0.5 m.
In another technical scheme, the detection period of each temperature sensor is 15 min/time.
In another technical scheme, flow regulating valves and flow detection devices are arranged on water inlet sections and water outlet sections of the second cooling water pipe 21 and the third cooling water pipe 22, and the flow of cooling water in the second cooling water pipe 21 and the third cooling water pipe 22 is 20-35L/min by regulating the flow regulating valves.
In another technical scheme, a gap is reserved at the joint of the two sections of cooling water pipes 4 and the two sections of cooling water pipes are connected through a rubber joint, the rubber joint comprises a sleeve 41 and a rubber pipe 42, the two ends of the rubber pipe 42 are respectively sleeved on the outer walls of the two sections of cooling water pipes 4, the sleeve 41 is sleeved outside the rubber pipe 42, the two ends of the sleeve 42 are provided with a pair of connecting rings 46 on the inner walls thereof, the inner walls of the connecting rings 46 are in threaded connection with the outer walls of the two sections of cooling water pipes 4, a pair of clamping rings 43 are arranged between the inner wall of the sleeve 41 and the outer wall of the rubber pipe 42 along the circumferential direction, and the two ends of the rubber pipe 42 are respectively abutted between the.
In the above technical solution, because; in a preferred embodiment, the ends of the rubber tube 42 are also pressed and fixed to the outer wall of the cooling water tube 4 by the connection rings 46, respectively, to make the structure more stable.
In another technical scheme, the collar 43 is a plurality of circular arcs, the plurality of circular arcs can be combined into a ring, a groove is formed in the outer side surface of each collar 43, one end of the fastening bolt 44 is embedded in the groove, the sleeve 41 is provided with a through hole, a thread matched with the fastening bolt 44 is processed on the inner wall of the through hole, and the other end of the fastening bolt 44 penetrates through the through hole and is located outside the sleeve 41; in this embodiment, the fastening bolt 44 can press the collar 43 against the rubber tube 42 to prevent the cooling water from flowing out of the rubber tube 42.
In another technical scheme, sealing rings 45 are arranged between the two ends of the rubber tube 42 and the outer wall of the cooling water tube 4, so that cooling water is prevented from leaking.
Example 1:
in the construction process of the project A, the following method is adopted to control the temperature of the mass concrete:
step one, according to the arrangement mode of the invention, arranging a cooling water system, wherein the distance from a first cooling water pipe network 1 to the top surface of a bearing platform is 0.5m, the distance from a third cooling water pipe network 3 to the bottom surface of the bearing platform is 0.5m, the vertical distance between the cooling water pipe networks in adjacent layers is 1.5m, the horizontal distance between adjacent water pipes of the same cooling water pipe is 1.0m, the distance between the outermost layer of water pipes and the nearest edge of concrete is 0.5m, and all water inlets and water outlets are vertically led out of the top surface of the concrete by more than 0.5 m; cooling water pipes are all seamless steel pipes with the diameter of 32 multiplied by 2.5mm, and the cooling water pipes 4 are connected through the rubber joint; flow regulating valves and flow detection devices are arranged at the water inlet sections and the water outlet sections of the second cooling water pipe 21 and the third cooling water pipe 22, and the flow of cooling water in the second cooling water pipe 21 and the third cooling water pipe 22 is 30L/min by regulating the flow regulating valves;
secondly, arranging temperature measuring points according to the arrangement mode, wherein surface, middle and bottom temperature measuring points are arranged in the bearing platform, the temperature measuring points are respectively 50mm away from the surface of the concrete, the center of the concrete and 50mm away from the bottom of the concrete, and temperature sensors are respectively arranged at the temperature measuring points and are respectively used for detecting the temperature of the surface concrete, the inner concrete and the bottom concrete; the detection period is 15 min/time;
step three, after the concrete pouring is finished, controlling the temperature of the concrete according to the method;
the environmental temperature is 28-35 ℃, the mold-entering temperature of the concrete is 29.8 ℃, after about 48 hours of pouring, the maximum temperature of the internal concrete is 65.3 ℃, the temperature of the surface concrete is 47.5 ℃, the temperature of the bottom concrete is 56.2 ℃, and the maximum temperature difference between the internal concrete and the surface concrete is 24.8 ℃;
the water inlet temperature of the cooling water system is 34-41 ℃, after the temperature is controlled for 96 hours, the temperature of the internal concrete is 57.4 ℃, the temperature of the surface concrete is 39.3 ℃, the temperature of the bottom concrete is 48.5 ℃, the temperature difference between the internal concrete and the surface concrete is 18.1 ℃, and the temperature difference between the internal concrete and the bottom concrete is 8.9 ℃.
Comparative example 1:
in the construction process of the project B, the following method is adopted to control the temperature of the mass concrete:
step one, arranging a cooling water system: as shown in fig. 5, three layers of cooling water pipe networks are horizontally divided in the bearing platform and are sequentially arranged at intervals, the cooling water pipes are coil-like pipes and are sequentially communicated from top to bottom, two ends of each cooling water pipe are respectively provided with a water inlet 51 and a water outlet 52, wherein the water inlet 51 is arranged at the bottom layer, and the water outlet 52 is arranged at the top layer;
wherein the distance from the topmost cooling water pipe network to the top surface of the bearing platform is 0.5m, the distance from the bottommost cooling water pipe network to the bottom surface of the bearing platform is 0.5m, the vertical distance between the cooling water pipe networks in adjacent layers is 1.5m, the horizontal distance between adjacent water pipes of the same cooling water pipe is 1.0m, the distance from the outermost water pipe to the nearest edge of concrete is 0.5m, and a water inlet and a water outlet are both vertically led out of the top surface of the concrete by more than 0.5 m; the cooling water pipes are all seamless steel pipes with the diameter of 32 multiplied by 2.5 mm; the water inlet and the water outlet are respectively provided with a flow regulating valve and a flow detection device, and the flow of cooling water is adjusted to be 30L/min by regulating the flow regulating valves;
step two, arranging temperature measuring points: temperature sensors are arranged at the water inlet and the water outlet; surface temperature measuring points, middle temperature measuring points and bottom temperature measuring points are arranged in the bearing platform, the surface temperature measuring points, the middle temperature measuring points and the bottom temperature measuring points are respectively located 50mm away from the surface of the concrete, 50mm away from the center of the concrete and 50mm away from the bottom of the concrete, and temperature sensors are respectively arranged at the temperature measuring points and are respectively used for detecting the temperature of the surface concrete, the temperature of the inner concrete and the temperature of the bottom concrete;
step three, controlling the temperature of the concrete, comprising the following steps:
(1) cooling water is introduced into the cooling water system from the water inlet and flows out of the cooling water system from the water outlet;
(2) controlling the temperature difference between the water temperature at the water inlet and the internal concrete to be 23-25 ℃;
(3) when the temperature difference between the water inlet and the water outlet reaches 5 ℃, the water inlet and the water outlet are exchanged;
(4) when the difference between the temperature of the internal concrete and the temperature of the surface concrete is 17-20 ℃, the water supply is stopped.
The environmental temperature is 28-35 ℃, the mold-entering temperature of the concrete is 29.7 ℃, after about 48 hours of pouring, the maximum temperature of the internal concrete is 68.7 ℃, the temperature of the surface concrete is 49.2 ℃, the temperature of the bottom concrete is 52.6 ℃, and the maximum temperature difference between the internal concrete and the surface concrete is 27.5 ℃;
the water inlet temperature of the cooling water system is 34-41 ℃, after the temperature is controlled for 96 hours, the temperature of the internal concrete is 61.2 ℃, the temperature of the surface concrete is 42.6 ℃, the temperature of the bottom concrete is 45.8 ℃, the temperature difference between the internal concrete and the surface concrete is 18.6 ℃, and the temperature difference between the internal concrete and the bottom concrete is 15.4 ℃.
It can be known from the embodiment 1 and the comparative example 1 that, under the condition that the construction conditions are basically the same, the temperature of the concrete is controlled by using the temperature control method for the large-volume concrete, the temperature of the internal concrete is reduced rapidly, and the temperature difference between the internal concrete and the surface concrete is obviously reduced, so that the temperature control method for the large-volume concrete can effectively reduce the temperature difference between the inside and the outside of the concrete, reduce the temperature stress, ensure the construction quality and improve the construction efficiency.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (8)
1. The temperature control method of the mass concrete is characterized by comprising the following steps:
step one, arranging a cooling water system: cooling water systems are distributed in the bearing platform in a layered mode, and each cooling water system comprises a first cooling water pipe network, a second cooling water pipe network and a third cooling water pipe network which are sequentially distributed in different horizontal planes of the bearing platform at intervals from top to bottom;
the first cooling water pipe network comprises a first cooling water pipe which is longitudinally arranged in the bearing platform, two ends of the first cooling water pipe are respectively provided with a first water inlet and a first water outlet, and the first cooling water pipe is a coil-like pipe;
the second cooling water pipe network comprises a second cooling water pipe and a third cooling water pipe which share a second water inlet and a second water outlet, the second cooling water pipe and the third cooling water pipe respectively comprise a water inlet section, an intermediate section and a water outlet section which are sequentially connected, wherein the water inlet section and the intermediate section of the second cooling water pipe are similar to a coiled pipe, the water outlet section is a straight pipe, the water inlet section of the third cooling water pipe is a straight pipe, the intermediate section and the water outlet section are similar to a coiled pipe, the intermediate section of the second cooling water pipe and the intermediate section of the third cooling water pipe are arranged in a staggered mode, the water inlet section of the third cooling water pipe is arranged outside the arrangement area of the second cooling water pipe, and the water outlet section of the second cooling water pipe is arranged outside the arrangement area of the third;
the third cooling water pipe network comprises a fourth cooling water pipe which is longitudinally arranged in the bearing platform, a third water inlet and a third water outlet are respectively arranged at the two ends of the fourth cooling water pipe, and the fourth cooling water pipe is a coil-like pipe;
the first cooling water pipe network and the third cooling water pipe network are longitudinally arranged, and the second cooling water pipe network is transversely arranged so as to horizontally project the cooling water pipes in different floor surfaces into a cross structure;
step two, arranging temperature measuring points: temperature sensors are arranged at the second water inlet and the second water outlet; surface, middle and bottom temperature measuring points are arranged in the bearing platform, and temperature sensors are respectively arranged at the temperature measuring points and are respectively used for detecting the temperature of the surface concrete, the temperature of the inner concrete and the temperature of the bottom concrete;
step three, controlling the temperature of the concrete, comprising the following steps:
s1: the first water inlet and the third water inlet are communicated with a second water outlet, and cooling water is introduced into a cooling water system from the second water inlet and flows out of the cooling water system from the first water outlet and the third water outlet respectively;
s2: controlling the water inlet temperature of the second cooling water pipe network to enable the temperature difference between the water temperature at the second water inlet and the internal concrete to be 23-25 ℃;
s3: when the temperature difference between the second water inlet and the second water outlet reaches 5 ℃, disconnecting the first water inlet and the third water inlet from the second water outlet, communicating the first water outlet and the third water outlet with the second water inlet, introducing cooling water into a cooling water system from the second water outlet, and respectively flowing out of the cooling water system from the first water inlet and the third water inlet;
s4: when the difference between the temperature of the internal concrete and the temperature of the surface concrete is 17-20 ℃, the water supply is stopped.
2. The temperature control method for mass concrete according to claim 1, wherein the cooling water pipes of the cooling water system are all seamless steel pipes with the diameter of 32 x 2.5 mm.
3. The method for controlling the temperature of mass concrete according to claim 1, wherein the distance from the first cooling water pipe network to the top surface of the platform is 0.5 to 1.0m, the distance from the third cooling water pipe network to the bottom surface of the platform is 0.5 to 1.0m, the vertical distance between the cooling water pipe networks in adjacent layers is 1.0 to 1.5m, the horizontal distance between adjacent water pipes of the same cooling water pipe is 0.5 to 1.0m, the distance from the outermost water pipe to the nearest edge of the concrete is 0.3 to 0.7m, and all water inlets and water outlets are vertically led out of the top surface of the concrete by more than 0.5 m.
4. The method for controlling the temperature of mass concrete according to claim 1, wherein the detection period of each of the temperature sensors is 15 min/time.
5. The temperature control method for mass concrete according to claim 1, wherein the water inlet section and the water outlet section of the second cooling water pipe and the third cooling water pipe are respectively provided with a flow regulating valve and a flow detection device, and the flow regulating valves are adjusted to enable the flow of cooling water in the second cooling water pipe and the flow of cooling water in the third cooling water pipe to be 20-35L/min.
6. The temperature control method for mass concrete according to claim 2, wherein a gap is left at the joint of the two sections of cooling water pipes and the two sections of cooling water pipes are connected through a rubber joint, the rubber joint comprises a sleeve and a rubber pipe, the two ends of the rubber pipe are respectively sleeved on the outer walls of the two sections of cooling water pipes, the sleeve is sleeved outside the rubber pipe, the two ends of the sleeve are provided with a pair of connecting rings on the inner wall thereof, the inner walls of the connecting rings are respectively in threaded connection with the outer walls of the pair of cooling water pipes, a pair of clamping rings are circumferentially arranged between the inner wall of the sleeve and the outer wall of the rubber pipe, and the two ends of the rubber pipe are respectively abutted between the pair of clamping rings and the.
7. The method for controlling the temperature of mass concrete according to claim 6, wherein the collar is a plurality of circular arcs, the plurality of circular arcs can be combined into a ring, a groove is formed on the outer side surface of each collar, one end of the fastening bolt is embedded in the groove, the sleeve is provided with a through hole, the inner wall of the through hole is provided with a thread matched with the fastening bolt, and the other end of the fastening bolt penetrates through the through hole and is positioned outside the sleeve.
8. The method for controlling the temperature of mass concrete according to claim 6, wherein a seal ring is provided between both ends of the rubber tube and the outer wall of the cooling water tube.
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| CN109469063B (en) * | 2018-11-21 | 2023-11-07 | 中国电建集团成都勘测设计研究院有限公司 | Cooling water pipe device suitable for thin-wall concrete |
| CN111221361B (en) * | 2018-11-27 | 2021-08-31 | 河北高达智能装备股份有限公司 | Temperature control method for mass concrete construction |
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| CN110924418B (en) * | 2019-12-06 | 2021-08-20 | 湖北省路桥集团有限公司 | Large-volume cast-in-place special-shaped concrete bearing platform and construction method |
| CN112230690A (en) * | 2020-09-27 | 2021-01-15 | 中铁七局集团有限公司 | Mass concrete construction quality control method for pier-beam consolidation part of high-pier large-span bridge |
| CN113961025B (en) * | 2021-10-26 | 2022-06-24 | 海峡(福建)交通工程设计有限公司 | Temperature control system applied to large-volume concrete of lower bearing platform of swivel cable-stayed bridge |
| CN115419071B (en) * | 2022-09-06 | 2023-06-20 | 中建八局第一建设有限公司 | Large-volume concrete cooling system and construction method |
| CN115874831A (en) * | 2022-12-06 | 2023-03-31 | 中建八局第四建设有限公司 | Automatic temperature control method for mass concrete |
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