Cave foundation reinforcing method

A technology of foundation reinforcement and karst caves, which is applied in the direction of infrastructure engineering, construction, soil protection, etc., can solve the problems of increasing construction difficulty, increasing construction cost, and large grouting range, so as to shorten the construction period, save construction cost, The effect of less disease

Pending Publication Date: 2018-04-20
SHANGHAI CONSTR NO 5 GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the existing grouting method, the existing road on the ground needs to be demolished, and the grouting range is relatively large, which not only increases the difficulty of construction, but also increases the construction cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: This embodiment takes a construction project located in a karst area as an example. There are irregular karst caves 10 that affect construction safety under the construction area of ​​the underground comprehensive pipe gallery. Therefore, the underground karst caves 10 located under the foundation pit need to be reinforced. processing, combined below figure 1 and figure 2 Illustrate a kind of karst cave ground reinforcement method of the present invention, concrete steps are as follows:

[0022] S1: After the foundation pit excavation, support, and precipitation are completed, and before the construction of the main structure of the underground comprehensive pipe gallery starts, the geological survey method and geophysical prospecting are used on site to infer the distribution characteristics of the caves 10, including the size, scope, location and number of the caves 10, etc. The stability of karst cave 10 is evaluated by the roof collapse self-filling ...

Embodiment 2

[0033] Embodiment 2: different from Example 1, cement: water: water glass mixing ratio (mass ratio)=1:1:0.5, water glass modulus m=2.4, field test draws the initial setting time of double liquid slurry ( min)=30, fluidity (mm)=400.

Embodiment 3

[0034] Embodiment 3: Different from Embodiment 1 or 2, cement: water: water glass mix ratio (mass ratio)=1: 1.2: 0.4, water glass modulus m=3, field test draws initial setting time (min) =12, fluidity (mm) =360.

[0035] After the above-mentioned karst cave 10 foundation reinforcement treatment meets the design requirements, carry out slope support and install steel mesh sheets, and at the same time ensure that the foundation pit is in a stable state during construction. After the foundation pit foundation treatment is completed, lay waterproof membranes on the foundation and bind the bottom plate Reinforcement and pouring of concrete, and then installation of side wall and roof reinforcement and pouring of concrete to complete the construction of the underground comprehensive pipe gallery.

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Abstract

The invention discloses a cave foundation reinforcing method, and relates to the technical field of building construction. The cave foundation reinforcing method aims to solve the problems that if anexisting pouring method is implemented, existing roads on the ground surface need to be dismantled, the grouting range is large, the construction difficulty is increased, and the construction cost isfurther improved. The cave foundation reinforcing method comprises the following steps that after foundation pit excavation, supporting and precipitating are completed, a geophysical prospecting method is adopted on site, cave distribution characteristics are deduced through cooperation of the geophysical prospecting method of the geological exploration, and a proved cave boundary line and an unproved cave boundary line are determined according to geophysical prospecting data; a plurality of double-fluid grouting holes are drilled along the outer edge of the proved cave boundary line, so thata cave to-be-reinforced area is defined by the line of centers of the double-fluid grouting holes, single-fluid grouting holes are drilled in the cave to-be-reinforced area, and a grouting pipe is installed; and pressure grouting is conducted on the grouting pipe, firstly double-fluid grout made of cement, water and water glass is poured into the double-fluid grouting holes so that a wall for grouting of the cave to-be-reinforced area can be formed, then single-fluid grout is poured into the single-fluid grouting holes to conduct reinforcing, and grouting is completed when grouting pressure ofthe interiors of the single-fluid grouting holes reaches a design value.

Description

technical field [0001] The invention relates to the technical field of building construction, in particular to a reinforcement method for a karst cave foundation. Background technique [0002] There are karst caves or karst subsidence in karst areas. When building multi-storey or high-rise buildings on such foundations, the treatment depth of pile foundations or composite foundations is often limited due to the insufficient thickness of the foundation covering layer, which seriously affects the stability of building foundations. Reduce the bearing capacity of the foundation, therefore, before the construction of pile foundation or composite foundation, it is necessary to carry out necessary reinforcement and filling treatment on the karst cave or karst subsidence area. [0003] For karst caves with a large buried depth, reinforcement by perfusion is a relatively common treatment method. The perfusion material is injected through drilling holes and filled with karst caves. Th...

Claims

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Application Information

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IPC IPC(8): E02D3/12C04B28/26C04B111/70
CPCE02D3/12C04B28/26C04B2111/70C04B7/00
Inventor 高阔吴骞王吉祥
Owner SHANGHAI CONSTR NO 5 GRP CO LTD
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