CN-121976540-A - Construction method for quick pouring of continuous multi-dam-section cushion concrete of roller compacted concrete dam foundation

Abstract

The invention relates to the technical field of roller compacted concrete gravity dam construction of hydraulic and hydroelectric engineering, in particular to a construction method for quick pouring of continuous multi-dam-section roller compacted concrete dam foundation cushion concrete. The dam foundation cushion layer concrete directly replaces the traditional bamboo plywood and other measures by constructing roads in advance and adopting asphalt fir boards as templates, so that the damage and pollution to the dam section building base surface caused by the automobile entering the warehouse through the adjacent dam sections in the conventional pouring process are reduced, and the building base surface is cleaned for many times, compared with the complicated procedures of cleaning one warehouse, checking and accepting one warehouse, pouring one warehouse and cleaning one warehouse in the prior art, the pouring efficiency of low slump metamorphosis concrete of the dam foundation cushion layer of the adjacent dam sections is greatly improved, and a rapid and continuous pouring construction method is formed.

Inventors

• SHA SHIKANG
• WANG XU
• ZHOU PEI
• GAO MANKU
• GENG LIYANG
• Huo Wenke
• CAI JIALIANG

Assignees

• 中国水利水电第十一工程局有限公司

Dates

Publication Date

20260505

Application Date

20260330

Claims (4)

1. 1. The construction method for quick pouring of continuous multi-dam-section cushion concrete of the roller compacted concrete dam foundation is characterized by comprising the following steps: (1) Dividing the dam into a plurality of construction working surfaces according to the designed body type, the number of dam segments and the bank slope conditions, wherein each working surface comprises a plurality of dam segments; (2) According to the construction progress requirement, preferentially excavating the dam foundation at the lowest position, and excavating a dam foundation protection layer by adopting a manual prying and excavating, horizontal smooth blasting or layered blasting method until the elevation of a building base surface is designed, and performing expanding excavation treatment on the area with cracks and faults; (3) Cleaning a region with the width of 7 meters at the position of the adjacent dam section close to the warehouse entry port, and pouring concrete with the same label as the dam foundation to form a warehouse entry road; (4) Manually cleaning the foundation surface of each dam segment, and installing asphalt fir boards at the parting positions of the dam segments as templates; (5) The self-unloading truck runs to the farthest dam section through the warehouse entry road, concrete pouring is carried out from inside to outside, dam sections on two sides of the road are poured firstly, and finally a long-arm backhoe is used for repairing the parting joint between the dam sections.
2. 2. The construction method for quick casting of continuous multi-dam-section concrete for the roller compacted concrete dam foundation cushion layer is characterized in that the width of a warehouse entry road is 7 meters, and the roller compacted concrete dam foundation cushion layer is formed by casting concrete with the same label as a dam foundation.
3. 3. The construction method for quick casting of continuous multi-dam-section concrete of the foundation bed layer of the roller compacted concrete dam of claim 1, wherein the asphalt fir board template is not removed after the concrete casting is completed and is directly used as caulking material between the dam sections.
4. 4. The method for rapidly casting continuous multi-dam-section concrete on the foundation of the roller compacted concrete dam according to claim 1, wherein the concrete casting sequence is from the furthest dam section to the outside, the dam sections on two sides of the road are cast firstly, and the parting joint between the dam sections is treated finally.

Description

Construction method for quick pouring of continuous multi-dam-section cushion concrete of roller compacted concrete dam foundation Technical Field The invention relates to the technical field of roller compacted concrete gravity dam construction of hydraulic and hydroelectric engineering, in particular to a construction method for quick pouring of continuous multi-dam-section roller compacted concrete dam foundation cushion concrete. Background The foundation cushion layer of the roller compacted concrete gravity dam is generally made of 1-2m thick two-level low-slump normal concrete, and is transported to a construction site through a dump truck during pouring. Foundation mat casting is a key to ensure dam construction quality, and if a foundation is weak, such as a soft foundation or broken rock, uneven settlement and even cracking of a dam body can be caused. Before formally pouring bedding concrete after the dam foundation is excavated, a great deal of manpower and time are often required to clean bedrock cracks, weak broken belt rock layers, loose rocks and the like on the surface of a building base surface until a weak weathered complete rock body meeting design requirements is exposed, and then the dam foundation is poured. Meanwhile, due to deformation and settlement and other reasons in structural design of the roller compacted concrete gravity dam, a transverse seam is usually arranged along the axis of the dam at intervals of about 16-25 m to divide the dam into a plurality of dam segments, so that pouring of a foundation bedding layer of the dam is generally started from the lowest dam segment, the construction process comprises manual cleaning, formwork erection and concrete pouring of a foundation bedding layer of a single dam segment, after pouring of the foundation bedding layer of the dam segment is completed, a template is removed, a closed-cell foam board is attached to a formed concrete surface at the parting position between the dam segments for caulking, manual cleaning, formwork erection and concrete pouring of the foundation bedding layer of the adjacent dam segments are sequentially and circularly repeated until the concrete pouring of the foundation bedding layer of all dam segments of the dam is completed. When the existing dam foundation cushion layer construction technology encounters a longer dam and a plurality of divided dam segments, the labor investment can be increased, synchronous running water construction of multiple groups can be organized, but the construction cost is increased, the construction is influenced by sharing one warehouse entry road by a plurality of dam segments, and when the foundation cushion layer of one dam segment is constructed, a dump truck for transporting concrete inevitably pollutes the rock foundation of the cushion layer which is not poured by other dam segments, so that the cleaning difficulty is increased, and the integral pouring progress is influenced. How to quickly and continuously pour the concrete of the foundation cushion layer of the roller compacted concrete dam to accelerate the construction progress of the foundation cushion layer of the dam is a problem to be solved by the current technicians. Disclosure of Invention The invention provides a construction method for quick pouring of continuous multi-dam-section concrete of a foundation cushion layer of a roller compacted concrete dam, which aims to solve the problems in the prior art. In order to achieve the above purpose, the present invention adopts the following technical scheme: a construction method for quick pouring of continuous multi-dam-section cushion concrete of a roller compacted concrete dam foundation comprises the following steps: (1) Dividing the dam into a plurality of construction working surfaces according to the designed body type, the number of dam segments and the bank slope conditions, wherein each working surface comprises a plurality of dam segments; (2) According to the construction progress requirement, preferentially excavating the dam foundation at the lowest position, and excavating a dam foundation protection layer by adopting a manual prying and excavating, horizontal smooth blasting or layered blasting method until the elevation of a building base surface is designed, and performing expanding excavation treatment on the area with cracks and faults; (3) Cleaning a region with the width of 7 meters at the position of the adjacent dam section close to the warehouse entry port, and pouring concrete with the same label as the dam foundation to form a warehouse entry road; (4) Manually cleaning the foundation surface of each dam segment, and installing asphalt fir boards at the parting positions of the dam segments as templates. (5) The self-unloading truck runs to the farthest dam section through the warehouse entry road, concrete pouring is carried out from inside to outside, dam sections on two sides of the road are poured firstly, and finally a long-