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Subsequent backfilled pea gravel concrete for lining back of tunnels and backfilling method

A tunnel and lining technology, which is applied in the direction of construction, building structure, and building material processing, can solve the problems of unfavorable backfill effect, difficult water and leak plugging, and serious grouting, so as to meet the technical requirements of backfill and stop plugging. The effect of strong water capacity and lower overall cost

Inactive Publication Date: 2008-01-16
刘文涛
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The backfilling effect of the completed 4.8km prefabricated lining is not optimistic. The seepage area is still 50%, and the water inflow in some parts is as high as 5L / s, which makes it difficult to stop water and leaks in the later stage; When backfilling the excavated section, there is serious slurry stringing and serious material waste
For example, the Yellow River Diversion International V-mark connection section 7 # There are cracks in the mountain 3km from the water inlet of the tunnel. After excavation, prefabricated lining, backfilling and tunnel penetration, more than 800 tons of cement slurry were poured intermittently and repeatedly from the upper part of the side arch in one part of the tunnel, which lasted for more than a month. , still failed to complete the backfilling, so that the construction period could not be extended

Method used

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  • Subsequent backfilled pea gravel concrete for lining back of tunnels and backfilling method
  • Subsequent backfilled pea gravel concrete for lining back of tunnels and backfilling method
  • Subsequent backfilled pea gravel concrete for lining back of tunnels and backfilling method

Examples

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Effect test

Embodiment 1

[0065] This embodiment is a cast-in-place lining tunnel, the length of the backfilled tunnel is 0.6km, and the section of the tunnel is 50m 2 , the cavity between the back of the lining and the surrounding rock is 0.4-1.8m, and the amount of backfilling is 4900m 3 , take the core strength as 46MPa.

[0066] 1 Drilling, preparing the grouting head

[0067] Backfill the fine stone concrete behind the cast-in-place lining, drill an injection hole with a diameter ≥ 50 mm on the lining surface, and prepare a matching grouting head according to the diameter of the injection hole. The diameter of the grouting hole in this embodiment is 50 mm, and the diameter of the grouting head The diameter is 48mm, and the opening and closing valve is set at the grouting head, that is, a copper ball valve with a diameter of 50mm. The grouting head is an important part of the DXHB-10 multifunctional fine stone concrete pump, usually 20 spares, which can be used repeatedly.

[0068] 2. Install th...

Embodiment 2

[0078] The tunnel backfilled in this embodiment is 2km long and has a tunnel section of 13.8m 2 , the cavity between the back of the lining and the surrounding rock is 0.2-1.2m, and the amount of backfilling is 7000m 3 , take the core strength as 46MPa.

[0079] There are two differences between this embodiment and the first embodiment of the backfill method. First, this embodiment is based on the mix ratio of the backfill fine stone concrete B type, and the bulk density method is used to calculate the material. The materials are transported to the tunnel DXHB-10 multifunctional On the material platform of the stone concrete pump. According to the two groups of materials in Example 2 of backfilling fine stone concrete, add water, cement, and sand to the mixing tank of the DXHB-10 multifunctional fine stone concrete pump in turn for mixing, and the two mixing tanks work alternately to continuously supply materials. 2. At the same time as the backfilling operation, the quick-s...

Embodiment 3

[0081] The backfilled tunnel in this embodiment is 2km long and has a tunnel section of 13.8m 2 , the cavity between the back of the lining and the surrounding rock is 0.2-0.4m, and the amount of backfilling is 1184m 3 , take the core strength as 46MPa.

[0082] This embodiment is different from the first embodiment of the backfill method only in the mixing ratio of the fine stone concrete, and each group adds 200 kg of sieved pebbles with a particle size of 5-10 mm each time. In this embodiment, according to the mix ratio of backfill fine stone concrete type C, the material is prepared according to the bulk density method and transported to the material platform next to the DXHB-10 multifunctional fine stone concrete pump in the tunnel; each time the prepared backfill Raw materials, according to the two groups of materials in the third embodiment of backfilling fine stone concrete, add water, cement, sand, and stones into the mixing tank in turn, and mix evenly to form fine ...

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Abstract

The present invention relates to a fine stone concrete for backfilling tunnel or back protion of tunnel lining. Said fine stone concrete material composition includes general Portland PO32.5-PO42.5 cement, sand whose grain size is 0.16-5 mm, stone whose grain size is 5-10 mm or sodium silicate whose modulus is 2.8-3.2 and construction water. Said fine stone concrete backfilling material can have four types according to their different mixing ratios. Besides, said invention also provides the concrete steps of said backfilling method.

Description

technical field [0001] The invention relates to a method for backfilling behind tunnel or tunnel lining. Background technique [0002] Along with the construction of new traffic and the development of water resources, more and more long-distance tunnels and diversion tunnels are being built. The lining quality of tunnels or tunnels has attracted much attention. One of the important factors affecting the quality of linings is the quality of backfilling. The backfilling medium and backfilling method behind the lining of tunnels or tunnels are directly related to the comprehensive quality of backfilling. The precondition for the design bearing capacity of the tunnel or tunnel lining is that the lining and the surrounding rock are closely attached to bear the external load together. Therefore, the cavity between the back of the tunnel or tunnel lining and the surrounding rock must be poured evenly and densely, and the back of the lining and the surrounding rock are closely attac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B14/06E04G21/02
Inventor 刘文涛
Owner 刘文涛