Grouting embedded pipe underground laying method in landslide dam diaphragm wall construction

Abstract

The invention discloses a grouting embedded pipe underground laying method in landslide dam diaphragm wall construction, which includes the following steps: forming slotted holes in the landslide damdiaphragm wall; downwards suspending embedded pipes through cross beams layer by layer to enable the layers of embedded pipes to be underground laid in the slotted holes layer by layer; when each layer of embedded pipes are underground laid, simultaneously positioning the embedded pipes in the layer of embedded pipes through an embedded pipe truss, downwards laying the embedded pipe truss alongwith the layer of embedded pipes to the slotted holes, wherein the embedded pipe truss includes a main frame for fixing the embedded pipes and a plurality of positioning frames fixedly connected withthe main frame, wherein the positioning frames extend along the width directions of the slotted holes respectively and contact with two side wall lines of the slotted holes, so as to avoid the condition that the embedded pipe truss downwards laid to the slotted holes, along with the embedded pipes strikes probe rocks on the side walls of the slotted holes, and cannot be continued to downwards laying. According to the method provided by the invention, the embedded pipes can be quickly and smoothly downwards laid while avoiding probe rocks under the landslide dam formation condition, and the laying success rate of the embedded pipes is increased, and the curtain grouting quality under the wall is guaranteed.

Description

technical field [0001] The invention relates to the field of water conservancy and hydropower engineering, in particular to a method for laying a pre-embedded pipe for grouting in the construction of an anti-seepage wall of a dam body. Background technique [0002] The barrier body was formed by earthquake collapse and landslides. Since the improvement of the barrier lake is imminent, the improvement of the barrier body needs to adhere to the working idea of ​​research, design, and treatment at the same time. It is necessary to carry out the implementation of risk reduction and flood control projects such as barrier body improvement as soon as possible. The damming body improvement is to carry out anti-seepage treatment and partial slope surface improvement on the damming body, weir foundation and bank slopes on both sides. The anti-seepage treatment of the damming body adopts the combination of anti-seepage wall and curtain grouting. [0003] For the damming body, previous ...

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Problems solved by technology

[0003] For the damming body, previous engineering experience mainly focused on dismantling and diverting water flow. However, for a damming body with a huge volume formed by a super-large collapse, the cost of demolition is very high, and it is difficult to find it near the project site. There are so many accumulations in a suitable site, so if we can make full use of the dams and directly use the dams to form the dam, it will eliminate harm and bring benefits, and turn waste into treasure.

[0004] In the prior art, when laying embedded pipes, according to the past experience in the construction of cut-off walls in complex strata, the survival rate of embedded pipes is very low, and it is usually solved by filling grouting holes on the wall, which not only wastes time, but also Increase the cost of the project, and it is also a kind of damage to the concrete cut-off wall

For the geological conditions of the dam body with large boulder content, large particle size and high hardness, it is difficult to control the hole shape when the cut-off wall is grooved and there are many probe stones. The traditional pre-buried pipe positioning frame with a rectangular frame is used. It is easy to touch the wall of the hole or the probe stone when installing, which makes it impossible to install the embedded pipe smoothly. These unfavorable conditions cause great difficulties in the construction of the cutoff wall and pose a great challenge to the existing construction technology. Throughout the domestic and foreign No construction precedent

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