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Supporting process of portal frame type anchor pipe soil nail spraying net and modified reinforcing cement mortar employed by same

A gantry type, cement slurry technology, which is applied in basic structure engineering, sheet pile wall, excavation and other directions, can solve the problems of prolonging the construction period, reducing the speed of earthwork excavation, and prolonging the exposure time of the foundation pit, so as to save the construction period and improve the Early strength, adaptable effects

Active Publication Date: 2010-12-08
SANJIAN CONSTR ENG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the excavation depth of the basement is mostly more than 4 meters. For example, in Wenzhou, the excavation depth is 4-6 meters. , and the speed of earthwork excavation is doubled; it not only prolongs the construction period, but also prolongs the exposure time of the foundation pit

Method used

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  • Supporting process of portal frame type anchor pipe soil nail spraying net and modified reinforcing cement mortar employed by same
  • Supporting process of portal frame type anchor pipe soil nail spraying net and modified reinforcing cement mortar employed by same
  • Supporting process of portal frame type anchor pipe soil nail spraying net and modified reinforcing cement mortar employed by same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Soil samples were taken from a construction site in downtown Wenzhou, and one soil sample at a buried depth of 2.6m (silty clay) and 5.0m (silt) was taken for chemical composition analysis. According to the analysis of chemical composition, triethanolamine, brine, Seven kinds of chemical admixtures such as water glass are used as composite additives, which are compounded with cement, raw gypsum powder and fly ash. Since there is no testing machine specially suitable for the indoor compressive strength test of cement and soil, this test uses the mortar test model (7.07cm×7.07cm×7.07cm) and the small pressure mortar testing machine in the building materials laboratory. The dried soil sample is crushed on a mill, and after sieving, the above-mentioned materials and tap water that have been weighed in proportion in advance are put into the mixing pot in a certain order, mixed manually with a mixing shovel, and then put into the test mold twice. Vibrate 50 times with a steel...

Embodiment 2

[0071] Such as figure 2 Shown is the layout of the surrounding environment of a certain foundation pit in Wenzhou. The foundation pit is 123 meters long and 82 meters wide. The south side of the foundation pit is close to the main road (10 meters away from the side of the repaired road surface), and there are water pipes passing through the roadside; there are commercial houses 12 meters away from the north side, 2 private houses 10 meters away from the east side, and the west side is close to the road (with the repaired road side). The distance between the sides of the road is 10 meters); the depth of the foundation pit is 4.9 meters. Based on the above circumstances, the foundation pit in Wenzhou cannot be supported by conventional soil nailing spray nets, but should be supported by "bored piles + internal supports". In the case of conventional soil nail spray net support, the cost is about 2,300 yuan / long meter; while the "bored pile + inner support" support, the cost is ...

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Abstract

The invention discloses a supporting process of portal frame type anchor pipe soil nail spraying net and a modified reinforcing cement mortar employed by the same, which can greatly change the compression resistance and the shearing resistance of soft cement soil. In the novel supporting process of the portal frame type anchor pipe soil nail spraying net, a vertical large-diameter anchor pipe soil nail is added on the basis of the existing supporting technique of the conventional soil nail spraying net, a new formula of a 'modified' curing admixture is adopted to perform cement mortar blowing, and when the cross section of a foundation pit has large changes, theoretical and experimental researches are performed on a failure mode and deformation characteristics of the cross section of the foundation pit. Simultaneously, the supporting process is combined with actual projects to prove that the new type foundation pit support form can be adopted to excavate a foundation pit with the depth of 4 to 6 meters in Wenzhou, so not only the technical problem that a conventional soil nail spraying net support cannot be adopted when the excavation depth of the foundation pit in an urban area of Wenzhou is more than 4 meters is solved, but also compared with other available supports, the supporting process is money-saving and time-saving, reduces risks, and has good economic and social benefits.

Description

technical field [0001] The invention belongs to the technical field of civil engineering, and in particular relates to an economical, efficient and reliable foundation pit support for soft clay foundation treatment of foundation pit engineering, side slope engineering, shallow buried underground excavation engineering of pedestrian crossing tunnels in soft soil layers, and port wharf engineering. In the field of new technology of protection, in particular, it relates to a modified and reinforced cement slurry suitable for the new technology of foundation pit support and a gantry-type anchor pipe soil nail spray net support technology. Background technique [0002] Since the end of the 1990s, soil nail spray net support technology has been popularized and applied nationwide at an extraordinary speed as soon as it entered the market, and even in typical saturated soft clay areas like Wenzhou, nearly 70% of the foundation pits were built before 2004 This method is used as found...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/02E02D5/74C04B28/14
Inventor 潘林有余闯
Owner SANJIAN CONSTR ENG GROUP
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