Construction method for continuous multi-dam-section rapid pouring of dam foundation cushion layer concrete of roller compacted concrete dam

Abstract

The invention relates to the technical field of construction of roller compacted concrete gravity dams in water conservancy and hydropower engineering, in particular to a construction method for continuous multi-dam-section rapid pouring of dam foundation cushion layer concrete of a roller compacted concrete dam. According to dam foundation cushion concrete, by means of measures of building a road in advance, directly replacing traditional bamboo plywood with asphalt cedarwood boards for formworks and the like, the situation that in the conventional pouring process, damage and pollution are caused to a dam section foundation surface due to the fact that an automobile enters a warehouse through adjacent dam sections, and then the foundation surface is cleaned repeatedly is reduced; compared with the tedious procedures of one-bin cleaning, one-bin checking and accepting, one-bin pouring and one-bin re-cleaning circulation in the prior art, the pouring efficiency of the low-slump distorted concrete of the dam foundation cushion layers of the adjacent dam sections is greatly improved, and the rapid and continuous pouring construction method is formed.

Description

Technical Field

[0001] This invention relates to the field of roller-compacted concrete gravity dam construction technology in water conservancy and hydropower projects, specifically to a construction method for rapid pouring of continuous multi-section dam foundation cushion concrete in roller-compacted concrete dams. Background Technology

[0002] The foundation cushion layer of a roller-compacted concrete gravity dam typically uses 1-2m thick secondary-grade low-slump normal concrete, which is transported to the construction site by dump trucks during pouring. The pouring of the foundation cushion layer is crucial to ensuring the quality of dam construction. If the foundation is not solid, such as if there are weak layers in the ground or broken rocks, it may lead to uneven settlement of the dam body or even cracks.

[0003] Before the formal pouring of the foundation concrete after the foundation excavation is completed, a large amount of manpower and time is often required to clean the bedrock fissures, weak and fractured rock layers, and loose rocks on the foundation surface until a weakly weathered and intact rock mass that meets the design requirements is exposed before the foundation concrete is poured. Meanwhile, roller-compacted concrete gravity dams, considering deformation and settlement in their structural design, often have a transverse joint every 16-25 meters along the dam axis to divide the dam into multiple sections. Therefore, the foundation concrete pouring generally starts from the lowest section. The construction process involves manually cleaning the foundation surface of each section, erecting formwork, and pouring concrete. After the foundation concrete pouring for that section is completed, the formwork is removed, and closed-cell foam boards are applied to the already formed concrete surface at the joints between sections for caulking. This process is repeated for adjacent sections, involving manual cleaning, formwork erection, and concrete pouring, until all foundation concrete pouring for all dam sections is completed.

[0004] When faced with a long dam with many sections, existing dam foundation cushion layer construction technology can increase manpower and organize multiple shifts for simultaneous construction. However, this increases construction costs. Furthermore, due to the shared access road among multiple dam sections, dump trucks transporting concrete inevitably contaminate the rock foundations of other dam sections that have not yet been poured with cushion layers when constructing the foundation cushion layer for one section. This exacerbates the difficulty of cleaning and ultimately affects the overall pouring progress.

[0005] How to quickly and continuously pour roller-compacted concrete for the foundation cushion layer of a dam, and accelerate the construction progress of the foundation cushion layer, is a problem that technical personnel need to solve. Summary of the Invention

[0006] To address the problems of existing technologies, this invention provides a construction method for the rapid pouring of continuous multi-section dam foundation concrete for roller-compacted concrete dams.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A construction method for rapid continuous multi-segment pouring of roller-compacted concrete dam foundation cushion concrete includes the following steps:

[0009] (1) Based on the dam's design shape, the number of dam sections and the bank slope conditions, the dam is divided into several construction work faces, each of which contains several dam sections;

[0010] (2) In accordance with the construction schedule requirements, the lowest point of the dam foundation should be excavated first. The protective layer of the dam foundation should be excavated by manual prying, horizontal smooth blasting or layered blasting methods until the designed foundation elevation is reached. Areas with cracks or faults should be widened.

[0011] (3) At the location near the entrance of the adjacent dam section, clear out an area with a width of 7 meters and pour concrete of the same grade as the dam foundation to form an entrance road;

[0012] (4) Manually clean the foundation surface of each dam section and install asphalt fir wood boards as templates at the joints of the dam sections.

[0013] (5) The dump truck travels through the access road to the farthest dam section and pours concrete from the inside out. First, pour the dam sections on both sides of the road, and finally use a long-arm backhoe to fill the joints between the dam sections.

[0014] The preferred access road to the warehouse is 7 meters wide and is constructed using concrete of the same grade as the dam foundation.

[0015] The preferred asphalt fir wood formwork is not removed after the concrete is poured, but is used directly as a caulking material between dam sections.

[0016] The preferred concrete pouring sequence is to start from the furthest dam section and proceed from the inside out, first pouring the dam sections on both sides of the road, and finally treating the joints between the dam sections.

[0017] Compared with existing technologies, the beneficial effects of the invention are as follows: By constructing roads in advance and using asphalt fir wood boards directly instead of traditional bamboo plywood for the formwork, the damage and pollution caused by vehicles entering adjacent dam sections during conventional pouring, as well as the need for multiple cleanings of the foundation surface, are reduced. Compared with the cumbersome process of cleaning one section, inspecting one section, pouring one section, and cleaning another section in the existing conventional technology, the pouring efficiency of low slump modified concrete for the foundation of adjacent dam sections is greatly improved, forming a fast and continuous pouring construction method. Attached Figure Description

[0018] Figure 1 A schematic diagram of rapid pouring of roller-compacted concrete dam foundation cushion layer for multiple dam sections;

[0019] Figure 2 for Figure 1 Section 1-1;

[0020] Figure 3 for Figure 1 Section 2-2;

[0021] Figure 4 for Figure 1 Section 3-3;

[0022] Figure 5 A schematic diagram of the first step in pouring the foundation cushion layer for the Nth section of the roller-compacted concrete dam.

[0023] Figure 6 A schematic diagram of the second step in the pouring of the foundation cushion layer for the Nth section of the roller-compacted concrete dam.

[0024] Figure 7 A schematic diagram of the third step in the pouring of the foundation cushion layer for the Nth section of the roller-compacted concrete dam.

[0025] Figure 8 Schematic diagram of the fourth step in the foundation cushion layer pouring of the Nth section of the roller-compacted concrete dam;

[0026] Figure 9 A schematic diagram of the fifth step in the pouring of the foundation cushion layer for the Nth section of the roller-compacted concrete dam.

[0027] Figure 10 This is a schematic diagram of the first step in pouring the foundation cushion layer for the N+1# section of the roller-compacted concrete dam.

[0028] Figure 11 This is a diagram of the dam foundation excavation for dam sections 24-28.

[0029] Figure 12 This is a diagram showing the extensive manual clearing of the dam foundation for sections 24-28.

[0030] Figure 13 This is a diagram showing the installation of asphalt-impregnated fir planks at the joints of dam sections 24#-28#.

[0031] Figure 14 The diagram shows the installation of formwork for the concrete pouring of the dam foundation and the road pouring for dam sections 24-28.

[0032] Figure 15 Diagram showing dump trucks using pre-cast roads to enter the concrete foundation for dam sections 24-28.

[0033] Figure 16 This is a diagram showing the completed dam foundation pouring for dam sections 24-28.

[0034] Figure 17 This is a diagram showing the completion of foundation pouring for all dam sections within the dam range of 24#-28#.

[0035] Figure 18 This is a schematic diagram showing the pouring sequence of the dam foundation for sections 16-12.

[0036] Figure 19 This is a schematic diagram showing the pouring sequence of the dam foundation for sections 16-12.

[0037] The above figures clearly illustrate the core design of the invention, wherein... Figure 1 The plan layout of the continuous pouring of multiple dam sections is presented intuitively. Figure 5-10 This document details the installation of asphalt-fig wood formwork and the sequence of concrete pouring during the dam section construction process. Figure 1 , 4 The structural design of the concrete road filled in the pond was highlighted, which together demonstrates the creativity and technical feasibility of the construction method.

[0038] Explanation of reference numerals in the attached figures:

[0039] 1. Low-slump concrete for roller-compacted concrete dam foundation cushion (one dam section);

[0040] 2. Top of the roller-compacted concrete dam foundation cushion layer;

[0041] 3. Design elevation of the bottom of the roller-compacted concrete dam foundation;

[0042] 4. The asphalt fir wood planks at the joints of the dam sections serve as a one-time formwork to integrate casting and caulking functions. They can be used directly as permanent caulking material between dam sections without removal, simplifying the formwork removal and caulking process in traditional construction.

[0043] 5. Actual excavation elevation of the bottom of the roller-compacted concrete dam foundation;

[0044] 6. Concrete filling for over-excavated areas of the foundation;

[0045] 7. A dedicated access road constructed using the concrete used for filling the pond is designed with a width of 7 meters to allow directional passage for transport vehicles, avoiding compaction and contamination of the unpoured dam foundation and ensuring the cleanliness and efficiency of continuous construction of multiple dam sections.

[0046] 8. The foundation and downstream rock slope of the dam.

[0047] 9. Concrete road entrance filled with pond. Detailed Implementation

[0048] The present invention will be further described in detail below through embodiments. These embodiments are only used to illustrate the present invention and do not limit the scope of the present invention.

[0049] A construction method for rapid continuous multi-segment pouring of roller-compacted concrete dam foundation cushion concrete includes the following steps:

[0050] (1) Based on the dam's design shape, the number of dam sections and the bank slope conditions, the dam is divided into several construction work faces, each of which contains several dam sections;

[0051] (2) In accordance with the construction schedule requirements, the lowest dam foundation shall be excavated first. The protective layer of the dam foundation shall be excavated by manual prying, horizontal smooth blasting or layered blasting until the designed foundation elevation is reached. Areas with cracks or faults shall be expanded and excavated. When treating the foundation, mechanical equipment shall be used to excavate and remove the rocks first. The subsequent small-scale cleaning on the foundation surface shall be carried out manually.

[0052] (3) At the location near the entrance of the adjacent dam section, clear out an area with a width of 7 meters and pour concrete of the same grade as the dam foundation to form an entrance road; When manually clearing the foundation of multiple adjacent dam sections, first clear out a "road" with a width of 7 meters and a length of the design length of this dam section near the entrance road. This is mainly to meet the requirements of two dump trucks traveling in opposite directions. The "road" should be as close as possible to the downstream side. After the manual clearing meets the design requirements, the foundation surface of multiple dam sections in this area within the 7-meter width can be inspected. After the inspection is passed, concrete of the same grade as the dam foundation can be poured. During the pouring, only the over-excavated part caused by the defect treatment of the dam foundation within the road area needs to be backfilled and leveled. Finally, an entrance road that runs through multiple adjacent dam sections can meet the needs of mechanical equipment to travel on the dam foundation. The bedrock within the scope of the entrance road has been covered by concrete. During the dam foundation concrete pouring process, the construction machinery and equipment only travel on this road and will not pollute the foundation rock of other dams that have not been poured with concrete.

[0053] (4) The foundation surface of each dam section is manually cleaned, and asphalt-impregnated fir wood planks are installed as formwork at the joints between the dam sections. After the access road to the dam foundation is formed, the manual foundation cleaning team cleans and inspects the foundation surface of each dam section (except for the 7m wide road) from the inside out. At the same time, the formwork team can enter the site to install formwork at the joints between adjacent dam sections. When installing the formwork, asphalt-impregnated fir wood planks are used directly instead of traditional bamboo plywood for reinforcement. The reinforcement method is the same as that of bamboo plywood, and no additional measures are required. After the foundation concrete of this dam section is poured, the formwork does not need to be removed and can be used directly as caulking material at the joints between the dam section foundations.

[0054] (5) Dump trucks travel along the access road to the furthest dam section and pour concrete from the inside out. First, pour the dam sections on both sides of the road, and finally use a long-arm backhoe to fill the joints between the dam sections, and complete the pouring of all dam sections in sequence. When pouring the specific dam foundation cushion layer, it is carried out according to the divided work surface. One work surface consists of several dam sections. When pouring the dam foundation concrete in this work surface, dump trucks transport low slump modified concrete from the access point and enter the dam section furthest away through the road that has been poured in advance on the dam foundation, and pour it in sequence from the inside out. When pouring each dam section, first pour the concrete within the area of ​​the fixed asphalt fir planks on both sides of the road of this dam section. The concrete within the design thickness range of the dam foundation can be poured at the same time as the part of the dam foundation that needs to be filled due to over-excavation of geological defects, which is more conducive to the construction progress. When pouring, use a long-arm backhoe to transfer the concrete unloaded by the dump truck to the dam section, and then use a vibrator to compact the concrete. Once a single dam section is completed except for the 7m wide road area, the machinery is moved out of that section and placed on the 7m wide road of the next adjacent dam section. At this point, the formwork team enters and installs asphalt-impregnated planks to reinforce the expansion joints between the current and next adjacent dam sections. Subsequently, the concrete in this small area is shoveled into the formwork by a long-arm backhoe outside the dam section, and manual vibration continues until all the foundation concrete in the dam section is poured. Then, the foundation concrete pouring for the next adjacent dam section is continued, and the above steps are repeated until all the foundation concrete in the planned pouring area is poured, forming a continuous operation.

[0055] Stress Calculation of Asphalt-Fiberboard as a Substitute for Formwork: Asphalt-fiberboard is a commonly used expansion joint filler material, mainly used for sealing and caulking transverse joints in dams. Its function is to adapt to dam deformation, ensure stable water sealing, and ensure smooth formation of transverse joints in the dam. Considering that the dam foundation cushion layer is a 60cm thick layer of secondary aggregate modified concrete, the overall load on the side formwork is relatively small. Therefore, through stress calculation of the formwork, it is verified that asphalt-fiberboard can be used as a caulking material to directly replace the traditional bamboo plywood formwork as the side formwork for concrete pouring. Moreover, the reinforcement method is basically the same as that of bamboo plywood, and no additional measures are required.

[0056] (1) Calculation basis and parameters

[0057] 1) Concrete calculation parameters:

[0058] Casting dimensions: Length × Width × Height = 50m × 20m × 0.6m (casting height H = 0.6m).

[0059] Pouring speed: Volumetric velocity 100 m³ / h. Pouring area = 50 m × 20 m = 1000 m², therefore the theoretically calculated rising speed of concrete is V = 100 / 1000 = 0.1 m / h.

[0060] The concrete temperature is set at 20°C, and the initial setting time t0 = 200 / T + 15 = 35200 ≈ 5.714h.

[0061] 2) Construction loads:

[0062] Horizontal load generated by pouring concrete: 2.0 kN / m 2 .

[0063] Horizontal load generated by vibrating concrete: 2.0 kN / m 2 .

[0064] 3) Parameters of asphalt-impregnated fir wood planks:

[0065] Thickness h = 20mm. Material considered as solid fir: design value of bending strength f. m =11.0 N / mm 2 Elastic modulus E = 9000 N / mm 2 Design value of shear strength f v =1.4N / mm 2 .

[0066] Cross-sectional properties (calculated with a unit width b = 1000 mm):

[0067] Moment of inertia I=bh 3 / 12=1000×20 3 / 12=666667mm 4 .

[0068] Modulation moment W=bh 2 / 6 = 1000 × 20 2 / 6=66667mm 3 .

[0069] 4) Load combinations:

[0070] Strength verification: lateral pressure + construction load (tilting + vibration).

[0071] Stiffness verification: only lateral pressure (short-term construction load, deflection verification ignored).

[0072] (2) Calculation of lateral pressure on concrete

[0073] According to the standard JGJ162-2008, the lateral pressure is taken as the smaller value of the following two formulas:

[0074] F=0.22γ c t0β1β2V 1 / 2 =0.22×24×5.714×1.2×0.85× ≈9.73kN / m 2 .

[0075] F=γ c H = 24 × 0.6 = 14.4 kN / m 2 Where: F - the maximum lateral pressure of the freshly poured concrete on the formwork (kN / m) 2 )

[0076] γ c - The density of concrete (kN / m³) 3 Take 24kN / m 3

[0077] t0 - Initial setting time of freshly poured concrete (h): Taken as 5.714h;

[0078] V – Concrete pouring speed (m / h): Take 2.0 m / h

[0079] H – The total height from the location where the concrete lateral pressure is calculated to the top surface of the newly poured concrete, taken as 3m;

[0080] β1 – Correction factor for the effect of admixtures, taken as 1.2 when admixtures are added;

[0081] β2 – Concrete slump influence coefficient. When the slump is less than 30mm, take 0.85; when it is 50-90mm, take 1; when it is 110-150mm, take 1.15.

[0082] Taking the smaller value, the standard value of lateral pressure Fk = 9.73 kN / m 2 .

[0083] During strength verification, the design load includes the construction load:

[0084] Total design load q=F k +2.0 + 2.0 = 13.73 kN / m 2 (Conservative approach: take the sum of all values).

[0085] Line load per unit width w = q × 1 m = 13.73 kN / m = 0.01373 N / mm × 1000 = 13.73 N / mm (The calculation process is retained here; the actual w = 13.73 kN / m)

[0086] (3) Template verification (based on secondary rib support spacing L)

[0087] The formwork panel is supported on the secondary beams (timber), and is usually calculated as a simply supported beam model, with strength (bending stress) and stiffness (deflection) verified.

[0088] 1) Strength verification (bending stress)

[0089] Maximum bending moment Mmax=wL 2 / 8 (simply supported beam).

[0090] Bending stress σ=M / W=wL 2 / 8W≤f m =11N / mm 2 .

[0091] Solve for L≤ = ≈ ≈654mm.

[0092] 2) Stiffness verification (deflection)

[0093] Lateral pressure only: q k =F k =9.73kN / m 2 Line load w k =9.73 N / mm.

[0094] Maximum deflection δmax=5w k L 4 / 384EI≤250L (allowable deflection is L / 250).

[0095] Solve for L 3 ≤384EI / 1250w k :

[0096] EI=9000×666,667=6.0×109N·m².

[0097] L 3 ≤384×6.0×10 9 / 1250×9.73≈2.304×10 12 / 12126.5≈190000000mm 3 .

[0098] That is, L≤ ≈575mm.

[0099] 3) Shear stress verification

[0100] Maximum shear force V max =wL / 2.

[0101] Shear stress τ = 3V / 2A = 3wL / 2 × (1000 × 20) ≤ f v =1.4N / mm 2 .

[0102] Solving for L, we find that L ≤ 2 × 20,000 × 1.4 / (3 × 13.54) ≈ 2757 mm, which is much larger than the bending control value, therefore the shear stress is not controlled.

[0103] Conclusion: The formwork is controlled by deflection (L≤575mm), followed by strength (L≤654mm), meaning that the asphalt fir wood planks meet the requirements for withstanding deformation during concrete pouring.

[0104] Specific steps: 1. Dam section foundation cleaning and acceptance: Manually clean the loose rocks, soil, and debris remaining on the foundation surface of dam section N#, and use a high-pressure water gun to wash away surface dust until the weakly weathered and intact rock mass is exposed. For unfavorable geological areas such as bedrock fissures and faults, excavate according to design requirements and level with filler concrete (see attached diagram, label 6). After passing the supervisor's acceptance, proceed to the next process.

[0105] 2. Installation of Asphalt-Fir Wood Board Formwork: At the joint between dam section N# and dam section N+1#, vertically install asphalt-fir wood board 4. The height of the formwork should be consistent with the thickness of the subbase concrete (60cm). Use steel reinforcement supports to ensure that the verticality deviation is ≤3mm. The joints of the formwork should be filled with sealant to prevent grout leakage during concrete pouring.

[0106] 3. Entry Road Connection: The entry road 7, constructed using the concrete from the filled pond, serves as the transportation channel. A 5-meter-long gentle slope connects the end of the road to the pouring area of ​​section N of the dam to ensure the safe passage of dump trucks. The road surface is moistened with water but without standing water to prevent segregation of the concrete during transportation.

[0107] 4. Concrete Pouring: Dump trucks will drive into the pouring area via a dedicated road and pour concrete using a "from far to near, layered" method (see attached). Figure 5-9 The first layer is poured to a thickness of 30cm and compacted using a vibrator. The second layer is poured up to the top of the roller-compacted concrete dam foundation cushion, and the surface is leveled using a plate vibrator. The concrete slump is monitored in real time during the pouring process (controlled between 10-30mm), and a set of test blocks is made for every 50m³.

[0108] 5. Joint Filling Treatment: Before the initial setting of the concrete in section N# of the dam (2-3 hours after pouring), use a long-arm backhoe to fill the concrete into the inside of the formwork at the joint, ensuring a tight bond with the adjacent dam section. After filling, cover with geotextile to retain moisture, and allow to cure for no less than 14 days.

[0109] Implementation Case: The construction method of the present invention for rapid pouring of thin-layer concrete for continuous multi-section dam foundation of roller-compacted concrete dam has been successfully applied in the construction of roller-compacted concrete dam of the upper reservoir civil engineering and metal structure installation project of a pumped storage power station.

[0110] The upper reservoir's roller-compacted concrete gravity dam has a crest width of 8m, a maximum main dam height of 68.2m, and a crest length of 1305m. It is divided into 65 dam sections, facing challenges such as numerous sections, a short construction period, and difficult pouring. Most of the 65 dam sections have been excavated to the foundation surface. The foundation cushion is a 60cm thick modified concrete with a slump of only 10-30mm. Due to the low slump, pumping is not feasible; instead, dump trucks must transport the concrete to designated pouring areas. Based on the main dam concrete schedule and contract deadlines, continuous pouring of the foundation sections is necessary to create conditions for the continuous rise of the subsequent roller-compacted concrete. Currently, sections such as dams 12-16, 24-28, and 41-47 have the conditions for continuous pouring of modified concrete for the dam foundation. If the traditional pouring method is used, such as for dams 12-16, the foundation of dam 16 must be cleaned first, and then poured after acceptance. During the pouring process, the impact of passing machinery and equipment will contaminate other surfaces, making it impossible to effectively clean the foundation surfaces of dams 12, 13, 14, and 15 in advance. The cleaning, acceptance, and pouring of dam 15 can only be carried out after dam 16 is poured. This cycle continues until dam 12 is poured, and only then can the roller-compacted concrete construction work be carried out in the dam 12-16 section. To ensure the timely completion of the dam foundation pouring plan, a 7m wide concrete road was constructed on the foundation surface of the main dam sections 12#-16# near the existing access road. The dam foundation within the road area was leveled using modified concrete with the same strength as the dam foundation cushion layer. Simultaneously, 20mm thick asphalt-impregnated fir planks were used as formwork for concrete pouring between the joints of dam sections 12#-13#, 13#-14#, 14#-15#, and 15#-16#. After the pouring of dam section 16#, the asphalt-impregnated fir planks for dam sections 15#-16# did not need to be removed and were used as caulking material. This measure can accelerate the efficiency of the dam foundation cushion concrete pouring and reduce the damage and pollution caused to the foundation surface by vehicles entering adjacent dam sections during conventional pouring processes, thus reducing the need for multiple cleanings of the foundation surface.

[0111] To ensure the asphalt-impregnated fir planks do not deform during concrete pouring, additional reinforcing bars and main and secondary ribs are added to the inner side of the asphalt-impregnated fir planks in the dam foundation cushion layer to share the load. 12mm diameter round steel bars are installed at 60cm intervals and welded to the pre-embedded reinforcing bars within the dam foundation. The vertical secondary ribs are made of 50mm×100mm timber at 500mm intervals, and the horizontal main ribs are made of φ48×3mm double steel pipes. Due to the pouring height of only 0.6m, only one main rib is installed in the middle. During installation, the joint lines between dam sections are accurately measured and laid out in advance, and installation and reinforcement are carried out piece by piece from upstream to downstream. Installation is temporarily suspended at the fill-in road area inside the dam foundation.

[0112] The modified concrete for the dam foundation is machine-made modified concrete, which is directly mixed at the mixing plant and transported to the construction compartment by 25t dump trucks. It is then spread and transferred using a long-arm backhoe or excavator, and poured using mechanical vibrators and manual assisted vibration.

Claims

1. A construction method for rapid continuous multi-section pouring of roller-compacted concrete dam foundation cushion concrete, characterized in that, Includes the following steps: (1) Based on the dam's design shape, the number of dam sections and the bank slope conditions, the dam is divided into several construction work faces, each of which contains several dam sections; (2) In accordance with the construction schedule requirements, the lowest point of the dam foundation should be excavated first. The protective layer of the dam foundation should be excavated by manual prying, horizontal smooth blasting or layered blasting methods until the designed foundation elevation is reached. Areas with cracks or faults should be widened. (3) At the location near the entrance of the adjacent dam section, clear out an area with a width of 7 meters and pour concrete of the same grade as the dam foundation to form an entrance road; (4) Manually clean the foundation surface of each dam section and install asphalt fir wood boards as templates at the joints of the dam sections; (5) The dump truck travels through the access road to the farthest dam section and pours concrete from the inside out. First, pour the dam sections on both sides of the road, and finally use a long-arm backhoe to fill the joints between the dam sections.

2. The construction method for rapid pouring of continuous multi-section dam foundation cushion concrete of roller-compacted concrete dam according to claim 1, characterized in that: The access road to the warehouse is 7 meters wide and is made of concrete of the same grade as the dam foundation.

3. The construction method for rapid pouring of continuous multi-section dam foundation cushion concrete of roller-compacted concrete dam according to claim 1, characterized in that: The asphalt-impregnated fir wood formwork is not removed after the concrete is poured; it is used directly as a caulking material between dam sections.

4. The construction method for rapid pouring of continuous multi-section dam foundation cushion concrete of roller-compacted concrete dam according to claim 1, characterized in that: The concrete pouring sequence is to start from the furthest dam section and proceed from the inside out, first pouring the dam sections on both sides of the road, and finally treating the joints between the dam sections.

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