A construction method of rock cover heavy consolidation grouting
A technology of consolidation grouting and construction method, which is applied in the fields of infrastructure engineering, construction, soil protection, etc., can solve the problems of mutual influence and mutual interference with the surface grouting effect and separation of the foundation surface, so as to save cleaning costs and eliminate concrete. damage and quality assurance
Active Publication Date: 2019-02-19
SINOHYDRO ENG BUREAU 4
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Problems solved by technology
[0004] The present invention aims at the deficiencies existing in the existing dam consolidation grouting method, and provides a rock cover heavy consolidation grouting construction method to solve the contradiction and mutual interference between the existing dam foundation consolidation grouting construction and concrete pouring and foundation construction. The problem of poor surface grouting effect completely separates the consolidation grouting from the concrete pouring process, and realizes the continuous pouring of dam foundation concrete
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[0022] When the dam foundation is excavated, a 5m rock protection layer is reserved on the foundation surface to form a rock cover layer, and consolidation grouting operations are performed on the rock cover layer.
[0023] Arrange the consolidation grouting hole position according to the design drawing on the rock cover heavy layer, and carry out drilling and grouting according to the hole position, and the drilling direction is vertical to build the foundation surface; the rock cover heavy layer is grouted at low pressure, one-time hole-forming grouting without segmentation, and the foundation surface is built The following rock masses are grouted under high pressure and drilled in sections and grouted in sections.
[0024] After the rock cap heavy consolidation grouting quality inspection is qualified, measures such as shock absorption and loosening are taken to excavate and strip the rock cap heavy layer to form the foundation surface.
[0025] After the foundation surface...
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The invention provides a rock cover-weighted consolidation grouting construction method, and belongs to a dam foundation consolidation grouting method for hydraulic and hydroelectric engineering. When a dam foundation is excavated, a rock layer with the thickness being 5 m is reserved above the elevation of a foundation surface to be used as a rock cover weight, consolidation grouting is conducted, and the direction of grouting holes is perpendicular to the foundation surface; one-time pore-forming grouting is conducted on the rock cover weight layer, the grouting pressure is not larger than 0.5 MPa, segmented hole drilling and segmented grouting are conducted on the rock mass below the cover weight, the grouting pressure reaches 3 MPa, excavating and stripping are conducted on the rock cover weight layer after grouting ends and passes examination, shallow-layer quality inspection is then conducted on the foundation surface, and draft pipe grouting is conducted on unqualified parts. By means of the consolidation grouting construction method, the consolidation grouting time is brought forward to the dam foundation excavation stage from the dam foundation concrete pouring period, the dam foundation consolidation grouting procedure and the concrete pouring procedure completely make no contact, and dam foundation concrete continuous pouring is achieved. The consolidation grouting construction method has the beneficial effects of being high in construction speed, high in efficiency, good in grouting effect and the like, and the conflict that the dam foundation consolidation grouting construction for hydraulic and hydroelectric engineering and concrete pouring interfere with each other is eliminated.
Description
technical field [0001] The invention relates to a construction method of consolidation grouting, in particular to a construction method of heavy consolidation grouting for dam foundation rocks of water conservancy and hydropower projects. Background technique [0002] Consolidation grouting is a method to improve the mechanical properties of rock foundation joints, crack development or fracture zone and other geological defects, improve the uniformity, integrity and deformation resistance, compressive strength and elastic modulus of rock mass in dam foundation, and reduce the A construction technique of deformation and uneven settlement has been widely used in water conservancy and hydropower projects. Almost every dam aims to improve the integrity of the rock mass of the dam foundation, improve the mechanical properties of the rock mass at the geological defects of the dam foundation, and enhance the uniformity of the rock mass of the dam foundation. The rock mass of the da...
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IPC IPC(8): E02D15/02E02D3/12
CPCE02D3/12E02D15/02
Inventor 冯涛张兴刘俊国吴涛滕鸿煜郭长安周建龙付新梅罗增禄田贞东韩红霞
Owner SINOHYDRO ENG BUREAU 4
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