Rock-fill concrete construction and temperature control method

Abstract

The invention discloses a rock-fill concrete construction and temperature control method, and relates to the field of concrete construction. The rockfill concrete construction and temperature control method comprises the steps of rockfill pretreatment, formwork building, rockfill filling, self-compacting concrete pouring, rockfill concrete temperature control curing and the like, rockfill is pretreated through an adjustable-pressure high-pressure cleaning device, and proper rocks are screened out. The arranged hammering device is matched with the vibrating reinforcing steel bar, and when the self-compacting concrete is poured, the concrete flowing speed is increased through vibration of the vibrating reinforcing steel bar, the filling time is shortened, and meanwhile internal cavitation bubbles are eliminated. A temperature sensor is arranged in the whole construction process to monitor the temperature in real time, electric blanket heating or water spraying cooling measures are adopted in the curing stage according to the internal and external temperature difference, and the concrete temperature is accurately controlled. According to the rock-fill concrete construction and temperature control method, the construction efficiency, compactness and structural stability of rock-fill concrete are improved, and the service life of a project is prolonged.

Description

Technical Field

[0001] This invention relates to the field of concrete construction, specifically to a method for temperature control in riprap concrete construction. Background Technology

[0002] As an important construction method for large-volume concrete projects, riprap concrete construction technology involves directly stacking large-diameter boulders into a formwork, followed by pouring a special self-compacting concrete that requires no vibration. Utilizing the high fluidity and permeability of the self-compacting concrete, the voids in the boulders are filled by its own weight, forming a complete, dense concrete structure with low heat of hydration. This technology boasts advantages such as simple construction processes, low hydration temperature rise, and easy on-site quality control, and has broad application prospects in numerous engineering fields.

[0003] In the construction of conventional riprap concrete, qualified riprap is first transported to the work surface and naturally stacked, followed by the pouring of self-compacting concrete, which relies solely on its own weight to fill the voids in the riprap. However, in actual construction, conventional riprap concrete has significant drawbacks: Firstly, self-compacting concrete flows only by its own weight, and its flow speed is slow due to the resistance of the riprap voids (such as differences in stone particle size and uneven compaction). This makes it prone to "cold joints" in concrete due to excessively long pouring intervals, affecting structural strength. Secondly, during the flow of self-compacting concrete, air in the riprap voids is difficult to completely escape, easily forming cavitation at the interface between the riprap and concrete and within the concrete itself. This reduces the interfacial bond strength of the riprap concrete, and the cavitation becomes a channel for the penetration of moisture and corrosive media, leading to concrete carbonation, steel corrosion, and shortening the service life of the project.

[0004] Therefore, existing technologies need to be improved. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing conventional riprap concrete construction technology, such as slow flow rate of self-compacting concrete and inability to handle internal voids, and to provide a riprap concrete construction and temperature control method to improve the construction efficiency, density and structural stability of riprap concrete, and extend the service life of the project.

[0006] This invention is achieved through the following technical solution:

[0007] This invention provides a method for construction and temperature control of riprap concrete, comprising:

[0008] S1 Rockfill Pretreatment: An adjustable pressure high-pressure cleaning device is used to treat hard rocks. The adjustable pressure high-pressure cleaning device includes a lifting nozzle frame, a pressure adjustment module and an infrared temperature measurement integrated unit. The lifting nozzle frame adjusts its height according to the size of the rocks. The infrared temperature measurement integrated unit monitors the temperature of the rocks in real time and selects rocks with suitable temperature and clean surface for later use.

[0009] S2 Formwork Construction: A detachable steel formwork is used to enclose the riprap concrete silo. Reinforcing steel frames are installed on the bottom and sides of the silo. Temperature sensors are installed on the detachable steel formwork and the reinforcing steel frames. Horizontal vibrating reinforcing bars are installed inside the reinforcing steel frames, and vertically extending connecting rods are connected to the middle of these vibrating reinforcing bars. An installation frame is erected around the riprap concrete silo, and the installation frame is equipped with a hammering device that vertically strikes the top of the connecting rod.

[0010] S3 Rockfill: The pretreated rock from step S1 is filled into the rockfill concrete silo. After filling, a hydraulic vibratory roller is used to compact the rock in an "S" shaped path.

[0011] S4 self-compacting concrete pouring: A concrete placing boom is used to pour the self-compacting concrete into the pores of the rockfill layer. During the pouring process, the hammering device continuously hammers the connecting rod, causing the vibrating steel bars to vibrate.

[0012] S5 Rockfill Concrete Temperature Control Curing: After pouring, cover the concrete surface with a heat-insulating and moisture-retaining film. Use the temperature sensor from step S2 to continuously monitor the internal temperature of the concrete. When the surface temperature of the concrete is too low compared to the internal temperature, add a temperature-controlled electric heating blanket on the outside of the heat-insulating and moisture-retaining film. When the surface temperature of the concrete is too high compared to the internal temperature, spray water to cool it down. Curing continues until the rockfill concrete reaches the required strength. After reaching the required strength, use a roughening machine to roughen the joint surface.

[0013] Furthermore, in this invention, in step S2 above, the hammering device includes a device body connected to the mounting bracket, the device body has a reciprocating channel inside, an electromagnet and a hammering cylinder are arranged in the reciprocating channel, the bottom of the hammering cylinder has an opening for the connecting rod to be inserted, and the top of the hammering cylinder has a magnet that repels the electromagnet.

[0014] Furthermore, in this invention, the main body of the aforementioned device is provided with a lifting wheel and a drive motor for driving the lifting wheel to rotate. The lifting wheel is provided with a lever, and the side wall of the hammering cylinder is provided with a stop bar adapted to the lever. After the lifting wheel rotates, the lever moves the stop bar, the hammering cylinder rises, and the repulsive force on the magnet becomes stronger and stronger. After the lifting wheel continues to rotate, the lever and the stop bar disengage, and the hammering cylinder rapidly hammers downwards due to the repulsive force.

[0015] Furthermore, in this invention, the bottom of the aforementioned magnet is provided with a buffer pad that is connected to the hammering cylinder.

[0016] Furthermore, in this invention, the pressure regulating module described in step S1 controls the water jet pressure at 10-20 MPa, and the cleaning time is 30-60 seconds per rock.

[0017] Furthermore, in this invention, rocks with an initial temperature of 5°C-25°C and a surface cleanliness of 95% or higher are selected for use in step S1.

[0018] Furthermore, in this invention, the unqualified rocks in step S1 are sorted to the waste area.

[0019] Furthermore, in this invention, the mix proportion of the self-compacting concrete in step S4 is cement: fly ash: slag powder: aggregate: water: admixture = 1: 0.3-0.5: 0.2-0.4: 2.5-3.5: 0.35-0.45: 0.01-0.02. During the preparation process, the temperature of the mixture and mixing water is controlled at 10-18℃, so that the concrete outlet temperature is maintained at 15-22℃.

[0020] Furthermore, in this invention, the above-mentioned admixture is configured as a polycarboxylate-based high-performance water-reducing agent with a water reduction rate ≥30%.

[0021] Furthermore, in this invention, the lifting nozzle frame described in step S1 is equipped with a rotating nozzle, and the outlet of the rotating nozzle is provided with a fan-shaped nozzle, the spray angle of which is 60°-120°.

[0022] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0023] 1. This invention uses an adjustable pressure high-pressure cleaning device to pre-treat riprap, which can not only effectively remove impurities from the rock surface and ensure surface cleanliness, but also screen out rocks with suitable temperatures, avoiding abnormal rock temperatures from affecting the bonding effect between concrete and rocks, thus improving the quality of riprap from the source.

[0024] 2. The hammering device set up during the formwork construction process works in conjunction with the vibrating steel bars to accelerate the flow of concrete and shorten the filling time during the pouring of self-compacting concrete. At the same time, it eliminates internal voids and improves the density and interfacial bond strength of the rubble concrete, thus solving the problems of slow flow and voids in ordinary rubble concrete. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings:

[0026] Figure 1 This is a schematic diagram of a detachable steel formwork, a reinforcing bar frame, and vibrating reinforcing bars according to an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of an adjustable high-pressure cleaning device according to an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the internal structure of the hammering device according to an embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram illustrating the start of the lever moving the stop lever upwards according to an embodiment of the present invention;

[0030] Figure 5 This is a schematic diagram illustrating the preparation for disengagement of the rising lever and the toggle stop lever in an embodiment of the present invention.

[0031] The attached diagram shows the markings and corresponding component names: 1-Adjustable pressure high-pressure cleaning device, 101-Lifting nozzle frame, 102-Pressure adjustment module, 2-Demountable steel formwork, 3-Rockfill concrete silo, 4-Reinforcing steel frame, 5-Vibrating reinforcing steel, 6-Connecting rod, 7-Mounting frame, 8-Hammering device, 801-Main body of the device, 8011-Reciprocating channel, 802-Electromagnet, 803-Hammering cylinder, 8031-Stop bar, 804-Buffer pad, 9-Magnet, 10-Lifting wheel, 1001-Lever. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments and accompanying drawings. The illustrative embodiments and descriptions of this invention are for explanation only and are not intended to limit the invention. The following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0033] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0034] Example

[0035] This embodiment is applied to the construction of a gravity dam with rockfill concrete in a certain water conservancy project. The specific construction steps are as follows:

[0036] Rockfill pretreatment

[0037] Granite can be selected as the hard rock, and an adjustable pressure high-pressure cleaning device 1 can be used to treat the granite. Combined with... Figure 2 As shown, the adjustable pressure high-pressure cleaning device 1 has a lifting nozzle frame 101 made of aluminum alloy. Its height can be adjusted by an electric push rod, with an adjustment range of 0.5m-3m. For granite with a size of 0.3-1.2m in this embodiment, the height of the lifting nozzle frame 101 is adjusted to 1m-2m. The pressure adjustment module 102 uses an electromagnetic proportional valve to control the water jet pressure. The pressure is set to 15MPa, and the cleaning time is 30s-60s per rock.

[0038] The infrared temperature measurement integrated unit uses a non-contact infrared temperature sensor to monitor the temperature of the granite in real time. It selects granite with an initial temperature of 10℃-20℃ and a surface cleanliness of over 96% for use. Unqualified granite is sorted to the waste area, and a total of a planned number of qualified granite are pre-processed.

[0039] Template building

[0040] Combination Figure 1 As shown, a detachable steel formwork 2 made of Q235 steel is used to enclose a riprap concrete silo 3. The steel formwork is 12mm thick, and the size of a single formwork piece is 2m×1.5m. The formwork pieces are connected by bolts. The riprap concrete silo 3 is 50m long, 20m wide, and 3m high. HRB400 grade steel reinforcement frames 4 are set on the bottom and sides of the riprap concrete silo 3. The spacing of the bottom steel reinforcement frames 4 is 20cm×20cm, and the spacing of the side steel reinforcement frames 4 is 15cm×15cm.

[0041] PT100 platinum resistance temperature sensors are attached to the inside of the detachable steel formwork 2 and the main reinforcement of the steel frame 4. A total of 60 to 80 temperature sensors are evenly distributed in different positions of the riprap concrete silo 3.

[0042] Furthermore, the inside of the steel reinforcement frame 4 is equipped with transverse HRB335 grade vibrating steel bars 5, the diameter of the vibrating steel bars 5 is 20mm, and a vertical connecting rod 6 with a diameter of 16mm is welded to the middle of each vibrating steel bar 5, the top of the connecting rod 6 extends 60cm beyond the top of the steel reinforcement frame 4.

[0043] It should be noted that the vibrating reinforcing bar 5 is V-shaped. When the connecting rod 6 transmits downward force, the vibrating reinforcing bar 5 pulls the reinforcing bar frames 4 on both sides inward to prevent the vibrating reinforcing bar 5 from pushing the reinforcing bar frames 4 on both sides outward to create a cavity.

[0044] Combination Figure 1As shown, an installation frame 7 is erected around the riprap concrete silo 3 using H-beams. A hammering device 8 is installed on the installation frame 7 at the position corresponding to each connecting rod 6. (Refer to...) Figure 1 and Figure 3 As shown, the main body 801 of the hammering device 8 is a metal shell with a vertical reciprocating channel 8011 inside. The electromagnet 802 is fixedly installed on the top of the reciprocating channel 8011; the hammering cylinder 803 is made of No. 45 steel, with an opening at the bottom, and the top of the connecting rod 6 is inserted from the bottom opening of the hammering cylinder 803.

[0045] Furthermore, in combination Figure 3 As shown, a neodymium iron boron magnet 9 is embedded and fixed in the top of the hammering cylinder 803. The magnet 9 has the same magnetic poles as the bottom of the electromagnet 802. The buffer pad 804 at the bottom of the magnet 9 is made of nitrile rubber, with a thickness of 10mm and a diameter the same as that of the magnet 9.

[0046] like Figure 3 As shown, two lifting wheels 10 are installed inside the main body 801 of the device, and the two lifting wheels 10 are located on the left and right sides of the hammering cylinder 803, respectively. The drive motor is a servo motor, which is connected to a reducer. The reducer drives the two lifting wheels 10 to rotate synchronously through a transmission structure. A lever 1001 is fixedly installed on each lifting wheel 10 (two levers 1001 can be used in other embodiments).

[0047] Stonefill

[0048] The pretreated granite was filled into the rockfill concrete chamber 3 in layers using a loader. The thickness of each layer was controlled at 60cm, and a total of 5 layers were filled. After filling, the granite was compacted by a hydraulic vibratory roller in an "S" shaped path. Each compaction area was compacted 3 times to ensure that the compaction degree of the rockfill layer was qualified.

[0049] Self-compacting concrete pouring

[0050] A concrete placing boom is used to pour self-compacting concrete into the pores of the riprap layer. The mix proportion of the self-compacting concrete is cement: fly ash: slag powder: aggregate: water: polycarboxylate superplasticizer = 1:0.4:0.3:3.0:0.4:0.015, where P.O42.5 ordinary Portland cement is used, fly ash is Grade II fly ash, slag powder is S95 grade slag powder, aggregate is 5-20mm continuously graded crushed stone, and the water reduction rate of polycarboxylate superplasticizer is 32%. During the preparation of self-compacting concrete, ice water (30% ice water content) is added to the mixing water to control the temperature of the mixture at 15℃, the temperature of the mixing water at 12℃, and the concrete outlet temperature at 18℃.

[0051] During the pouring process, combined with Figure 4 and Figure 5As shown, when the hammering device 8 is started, the drive motor drives the lifting wheel 10 to rotate. The lever 1001 moves the stop lever 8031 ​​to raise the hammering cylinder 803. When the lever 1001 is disengaged from the stop lever 8031, the hammering cylinder 803 hammers the connecting rod 6 downward under the repulsive force of the electromagnet 802 and the magnet 9. The hammering frequency can be set to 30 times / min, which drives the vibrating steel bar 5 to vibrate synchronously.

[0052] Temperature control curing of rubble concrete

[0053] Immediately after pouring, a 0.18mm thick polyethylene insulation and moisture-retaining film was placed over the concrete surface. Temperature sensors were used to monitor the internal and surface temperatures of the concrete in real time, recording data every hour. On the third day of curing, the internal temperature of the concrete was 55℃, and the surface temperature was 28℃, with a temperature difference of 27℃, exceeding 25℃. An 800W / m² temperature-controlled electric heating blanket was then added outside the insulation and moisture-retaining film. After heating for 2 hours, the surface temperature rose to 35℃, and the temperature difference decreased to 20℃. On the seventh day of curing, the internal temperature of the concrete... The temperature was 42℃, the surface temperature was 38℃, and the temperature difference was 4℃, less than 5℃. Water was sprayed onto the surface of the insulation and moisture-retaining film using a spray pipe at a rate of 8L / m²・h. After 1 hour of spraying, the surface temperature dropped to 35℃, and the temperature difference increased to 7℃. After 28 days of curing, the concrete strength was tested using the rebound method and found to reach 98% of the design strength, indicating that curing was complete. Subsequently, a roughening machine was used to roughen the joint surface. The water pressure of the roughening machine was set to 25MPa, and the roughening depth was 4mm. After roughening, the next layer of riprap concrete was constructed.

[0054] After the construction of this embodiment was completed, core samples were taken from the riprap concrete. The core samples were continuous and intact, with no obvious voids and a density of over 99%. Ultrasonic testing showed no obvious defects inside the concrete and that the interfacial bond strength met the design requirements. No temperature cracks appeared during the curing process, and the riprap concrete structure showed good stability, meeting the requirements for use as a gravity dam in a water conservancy project.

[0055] In summary, embodiments of the present invention provide a method for the construction and temperature control of riprap concrete, including...

[0056] S1 Rockfill Pretreatment: Adjustable pressure high-pressure cleaning device 1 is used to treat hard rocks. The adjustable pressure high-pressure cleaning device 1 includes a lifting nozzle frame 101, a pressure adjustment module 102 and an infrared temperature measurement integrated unit. The lifting nozzle frame 101 adjusts the height according to the rock size. The infrared temperature measurement integrated unit monitors the rock temperature in real time and selects rocks with suitable temperature and clean surface for later use.

[0057] S2 Formwork Construction: A detachable steel formwork 2 is used to enclose the riprap concrete silo 3. Reinforcing steel frames 4 are installed on the bottom and sides of the riprap concrete silo 3. Temperature sensors are installed on the detachable steel formwork 2 and the reinforcing steel frames 4. Horizontal vibrating reinforcing bars 5 are installed inside the reinforcing steel frames 4, and vertically extending connecting rods 6 are connected to the middle of the vibrating reinforcing bars 5. An installation frame 7 is erected around the riprap concrete silo 3, and the installation frame 7 is equipped with a hammering device 8 at the top of the vertically hammering connecting rod 6.

[0058] S3 Rockfill: The pretreated rock from step S1 is filled into the rockfill concrete silo 3. After filling, a hydraulic vibratory roller is used to compact the rock in an "S" shaped path.

[0059] S4 Self-Compacting Concrete Pouring: A concrete placing boom is used to pour the self-compacting concrete into the pores of the rockfill layer. During the pouring process, the hammering device 8 continuously hammers the connecting rod 6, causing the vibrating steel bar 5 to vibrate.

[0060] S5 Rockfill Concrete Temperature Control Curing: After pouring, cover the concrete surface with a heat-insulating and moisture-retaining film. Use the temperature sensor from step S2 to continuously monitor the internal temperature of the concrete. When the surface temperature of the concrete is too low compared to the internal temperature, add a temperature-controlled electric heating blanket on the outside of the heat-insulating and moisture-retaining film. When the surface temperature of the concrete is too high compared to the internal temperature, spray water to cool it down. Curing continues until the rockfill concrete reaches the required strength. After reaching the required strength, use a roughening machine to roughen the joint surface.

[0061] In step S2, the hammering device 8 includes a main body 801 connected to the mounting bracket 7. The main body 801 has an internal reciprocating channel 8011 containing an electromagnet 802 and a hammering cylinder 803. The bottom of the hammering cylinder 803 has an opening for inserting a connecting rod 6, and the top of the hammering cylinder 803 has a magnet 9 that repels the electromagnet 802. The main body 801 contains a lifting wheel 10 and a drive motor that drives the lifting wheel 10 to rotate. The lifting wheel 10 has a lever 1001, and the side wall of the hammering cylinder 803 has a stop lever 8031 ​​adapted to the lever 1001. After the lifting wheel 10 rotates, the lever 1001 moves the stop lever 8031, causing the hammering cylinder 803 to rise. The repulsive force on the magnet 9 becomes increasingly stronger. As the lifting wheel 10 continues to rotate, the lever 1001 and the stop lever 8031 ​​disengage, and the hammering cylinder 803 rapidly hammers downwards due to the repulsive force. A buffer pad 804 connected to the hammer cylinder 803 is installed at the bottom of the magnet 9. In step S1, the pressure regulating module 102 controls the water jet pressure at 10-20 MPa, and the cleaning time is 30-60 seconds per rock. In step S1, rocks with an initial temperature of 5℃-25℃ and a surface cleanliness of over 95% are selected for later use. In step S1, unqualified rocks are sorted to the waste area. In step S4, the mix proportion of the self-compacting concrete is cement: fly ash: slag powder: aggregate: water: admixture = 1: 0.3-0.5: 0.2-0.4: 2.5-3.5: 0.35-0.45: 0.01-0.02. During the preparation process, the temperature of the mixture and mixing water is controlled at 10-18℃, so that the concrete outlet temperature is maintained at 15-22℃. The admixture is a polycarboxylate-based high-performance water-reducing agent with a water reduction rate ≥30%. In step S1, the lifting nozzle holder 101 is equipped with a rotary nozzle, and the outlet of the rotary nozzle is provided with a fan-shaped nozzle with a spray angle of 60°-120°.

[0062] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for construction and temperature control of riprap concrete, characterized in that, include S1 Rockfill Pretreatment: The hard rock is treated by an adjustable pressure high-pressure cleaning device (1). The adjustable pressure high-pressure cleaning device (1) includes a lifting nozzle frame (101), a pressure adjustment module (102) and an infrared temperature measurement integrated unit. The lifting nozzle frame (101) adjusts the height according to the rock size. The infrared temperature measurement integrated unit monitors the rock temperature in real time and selects rocks with suitable temperature and clean surface for later use. S2 Formwork Construction: A detachable steel formwork (2) is used to form a riprap concrete silo (3). A steel reinforcement frame (4) is set on the bottom and sides of the riprap concrete silo (3). Temperature sensors are installed on the detachable steel formwork (2) and the steel reinforcement frame (4). A transverse vibrating steel reinforcement (5) is installed inside the steel reinforcement frame (4). A vertically extending connecting rod (6) is connected to the middle of the vibrating steel reinforcement (5). An installation frame (7) is erected around the riprap concrete silo (3). The installation frame (7) is equipped with a hammering device (8) that vertically hammers the top of the connecting rod (6). S3 Rockfill: The pretreated rock from step S1 is filled into the rockfill concrete silo (3). After filling, a hydraulic vibratory roller is used to compact the rock in an "S" shaped path. S4 self-compacting concrete pouring: A concrete placing boom is used to pour the self-compacting concrete into the pores of the rockfill layer. During the pouring process, the hammering device (8) continuously hammers the connecting rod (6), causing the vibrating steel bar (5) to vibrate. S5 Rockfill Concrete Temperature Control Curing: After pouring, cover the concrete surface with a heat-insulating and moisture-retaining film. Use the temperature sensor from step S2 to continuously monitor the internal temperature of the concrete. When the surface temperature of the concrete is too low compared to the internal temperature, add a temperature-controlled electric heating blanket on the outside of the heat-insulating and moisture-retaining film. When the surface temperature of the concrete is too high compared to the internal temperature, spray water to cool it down. Curing continues until the rockfill concrete reaches the required strength. After reaching the required strength, use a roughening machine to roughen the joint surface.

2. The method for construction and temperature control of riprap concrete according to claim 1, characterized in that, In step S2, the hammering device (8) includes a device body (801) connected to the mounting bracket (7). The device body (801) has a reciprocating channel (8011) inside. An electromagnet (802) and a hammering cylinder (803) are provided in the reciprocating channel (8011). The bottom of the hammering cylinder (803) has an opening for the connecting rod (6) to be inserted. The top of the hammering cylinder (803) has a magnet (9) that repels the electromagnet (802).

3. The method for construction and temperature control of riprap concrete according to claim 2, characterized in that, The main body (801) of the device is provided with a lifting wheel (10) and a drive motor for driving the lifting wheel (10) to rotate. The lifting wheel (10) is provided with a lever (1001). The side wall of the hammering cylinder (803) is provided with a stop bar (8031) adapted to the lever (1001). After the lifting wheel (10) rotates, the lever (1001) moves the stop bar (8031) and the hammering cylinder (803) rises. The repulsive force on the magnet (9) becomes stronger and stronger. After the lifting wheel (10) continues to rotate, the lever (1001) and the stop bar (8031) separate. The hammering cylinder (803) hammers downward rapidly due to the repulsive force.

4. The method for construction and temperature control of riprap concrete according to claim 2, characterized in that, The bottom of the magnet (9) is provided with a buffer pad (804) that is connected to the hammer cylinder (803).

5. The method for construction and temperature control of riprap concrete according to claim 1, characterized in that, In step S1, the pressure regulating module (102) controls the water jet pressure at 10-20 MPa and the cleaning time is 30-60 s per rock.

6. The method for construction and temperature control of riprap concrete according to claim 5, characterized in that, In step S1, rocks with an initial temperature of 5℃-25℃ and a surface cleanliness of over 95% are selected for use.

7. The method for construction and temperature control of riprap concrete according to claim 6, characterized in that, In step S1, non-compliant rocks are sorted to the waste area.

8. The method for construction and temperature control of riprap concrete according to claim 1, characterized in that, In step S4, the mix proportion of self-compacting concrete is cement: fly ash: slag powder: aggregate: water: admixture = 1: 0.3-0.5: 0.2-0.4: 2.5-3.5: 0.35-0.45: 0.01-0.

02. During the preparation process, the temperature of the mixture and mixing water is controlled at 10-18℃, so that the concrete outlet temperature is maintained at 15-22℃.

9. The method for construction and temperature control of riprap concrete according to claim 8, characterized in that, The admixture is configured as a polycarboxylate-based high-performance water-reducing agent with a water reduction rate of ≥30%.

10. The method for construction and temperature control of riprap concrete according to claim 1, characterized in that, In step S1, the lifting nozzle frame (101) is equipped with a rotary nozzle, the outlet of which is provided with a fan-shaped nozzle, the spray angle of which is 60°-120°.

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