Vacuum negative-pressure grouting method and system

Abstract

The invention discloses a vacuum negative-pressure grouting method. Through the effect of vacuum negative-pressure and pressure maintaining grouting, full grouting is achieved, and two machines are combined to carry out the grouting operation. The vacuum negative-pressure grouting method comprises the following steps that through a first grouting machine, a grouting material is conveyed from a grout inlet of a sleeve to a communicating cavity of a connected element and the inner portion of the sleeve by a pipeline; when the grouting material is about to flow out from a post-filling overflow opening of the sleeve, vacuum negative-pressure is formed inside the sleeve by the suction of a second grouting machine at the overflow opening, so that residual air in the sleeve can be sucked out, slurry can leak out secrete free water, and the whole sleeve and the gap area of the communicating cavity are filled with the grouting material; and the first grouting machine continues to perform pressure maintaining grouting at the grout inlet, so that it is guaranteed that the sleeve and the filling parts of the element is full of the grouting material.

Description

technical field [0001] The invention relates to a grouting method and system, and is especially suitable for node connection construction of prefabricated assembly buildings, prefabricated concrete wind power towers and other prefabricated components connected by the grouting method. Background technique [0002] In the prefabricated building structure, most of the joints of prefabricated components in my country are connected by sleeve grouting. The sleeve after grouting bears the role of force transmission between components, and its connection quality directly affects the safety of the prefabricated concrete structure. [0003] But at present, in the sleeve grouting connection construction of prefabricated component nodes, there is a lack of special sleeve grouting equipment that can effectively control the grouting fullness in the industry. The existing construction equipment is not ideal, and workers mainly rely on experience to operate, which has many shortcomings. The...

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Problems solved by technology

[0003] But at present, in the construction of sleeve grouting connection of prefabricated component joints, the industry lacks special sleeve grouting equipment that can effectively control the fullness of grouting. The existing equipment used in construction is not ideal. Workers mainly rely on experience to operate, and there are many deficiencies.

The fullness control of sleeve grouting is a difficult point in the prefabricated steel bar connection technology. Since this process is hidden and difficult to detect, the existing construction mainly uses overflow holes for observation. There is a flow dead zone between the flow connection port and the tail of the sleeve, which is easy to accumulate gas and the water from the slurry. Due to the lack of effective methods to ensure that the above-mentioned gas and the water from the slurry in the sleeve are completely drained, and the grouting material Due to various other factors such as performance, deflection of sleeve and steel bar installation, there may be a slurry cavity in the sleeve after grouting, and it is difficult to check, which makes the grouting fullness of the sleeve difficult to control, which leads to the failure of prefabricated components. It is difficult to guarantee the connection strength between them, which may leave quality problems for prefabricated construction projects.

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