CN203035080U

CN203035080U - Structure for preventing hole collapse of pebble layer drilling holes

Info

Publication number: CN203035080U
Application number: CN 201320005848
Authority: CN
Inventors: 柴艳飞; 王存贵; 余流; 张云富; 陆海英; 黄克起; 方杰
Original assignee: China Construction Sixth Engineering Division Co Ltd
Current assignee: China Construction Sixth Engineering Division Co Ltd
Priority date: 2013-01-06
Filing date: 2013-01-06
Publication date: 2013-07-03
Anticipated expiration: 2023-01-06

Abstract

The utility model discloses a structure for preventing hole collapse of pebble layer drilling holes. The structure is a mud skin layer coated on the hole wall of the pebble layer drilling holes. The mud skin is composed of clay, cement, plant straw broken materials and water and is coated on the periphery of the hole wall of each drilling hole. The mud skin layer on the periphery of the hole wall of the drilling holes has the effect strengthening cementing capability between pebbles and can effectively prevent hole collapse of the pebble layer drilling holes.

Description

A kind of collapse structure in hole of boulder bed boring that prevents

Technical field

The utility model relates to a kind of constructing structure, particularly relates to a kind of collapse structure in hole of boulder bed boring that prevents.

Background technology

When boulder bed carries out test boring, because the bond between the cobble is poor, the hole of very easily collapsing, that not only can't hole creeps into, and usually can make that drilling tool is stuck in the boring and can't takes out.Also do not solve at present the collapse good method in hole of boulder bed test boring on the engineering, it generally all is the first protection casing that in pebble layer is holed, plays, and then the work of creeping into of holing, the effect that setting of casing plays is limited, under the relatively poor situation of boulder bed cementing power, sleeve pipe goes down under being difficult to, and causes sleeve pipe to be embedded in the boring easily, not only can't solve actual engineering problem, but also cause very big economic loss.

Summary of the invention

The utility model provides a kind of collapse structure in hole of boulder bed boring that prevents for solving the technical problem that exists in the known technology.

The utility model for the technical scheme that solves the technical problem that exists in the known technology and take is: a kind of collapse structure in hole of boulder bed boring that prevents, this structure is the mud cortex that is put on the boulder bed borehole wall.

The thickness of described mud cortex is 30-60mm.

Advantage and the good effect that the utlity model has are: use the mud skin of being made up of clay, cement, straw particle and water to be put on around the drill hole wall; mud cortex around the drill hole wall can play the effect that bond between the cobble is strengthened in protection, can prevent and treat the hole of collapsing of boulder bed boring effectively.

Description of drawings

Fig. 1 prevents the collapse structural representation of structure in hole of boulder bed boring for the utility model is a kind of.

The specific embodiment

For further understanding summary of the invention of the present utility model, characteristics and effect, exemplify following examples now, and conjunction with figs. is described in detail as follows:

See also Fig. 1, a kind of collapse structure in hole of boulder bed boring that prevents, this structure is the mud cortex 2 that is put on the boulder bed borehole wall 1.The thickness of mud cortex 2 is looked the degree of consolidation of boulder bed and is determined that thickness should be in the 30-60mm scope.

The job practices of said structure may further comprise the steps:

One) preparation mud skin: at first with the big particle diameter soil particle crushing in the clay, make maximum clay particle diameter be no more than 20mm, then straw is pulverized with powder grass machine, make the maximum rod joint length of straw particle less than 25mm, at last, cement, straw particle, clay and water is more even than mix according to the quality of 1:8:3:3 to 1:6:2:2, and cement factor is not less than 9% of mud skin gross mass, and straw particle content is not less than 18% of mud skin gross mass.

Above-mentioned straw particle can be wheat stalk, also can be corn or rice straw.Above-mentioned cement is preferably early-strength cement, if the duration permission also can be Portland cement.Clay, cement, straw particle and water stir leave standstill 2-3 hour after, can use.

Two) hole with slewing drilling machine, after entering boulder bed, should guarantee that core-taking rate is not less than 30%, each drilling depth is less than 0.5m, after each drilling depth is finished, stop to creep into, the mud skin for preparing in advance is put on the borehole wall with long-armed scraper equably, the thickness of mud cortex is looked the degree of consolidation of boulder bed and is determined that thickness is in the 30-60mm scope.

Three) treat that the mud skin is put on the wall after 1-3 hour repeating step two) until the boring of finishing whole boulder bed.

In the process of creeping into, can adjust drilling depth at any time according to core-taking rate, should guarantee that core-taking rate is not less than 30%.

In above-mentioned mud skin, clay is the main material of mud skin, in the mud skin, play skeleton function, the effect of cement is the bond that improves the mud skin on the one hand, be to make the intensity of mud skin satisfy requirement of strength at short notice on the other hand, the effect of straw particle is the bond that effectively strengthens the mud skin, and the effect of water is the effect of playing the mix agent, makes clay, cement and straw particle can mix even.

Although by reference to the accompanying drawings preferred embodiment of the present utility model is described above; but the utility model is not limited to the above-mentioned specific embodiment; the above-mentioned specific embodiment only is schematic; be not restrictive; those of ordinary skill in the art is under enlightenment of the present utility model; not breaking away under the scope situation that the utility model aim and claim protect, can also make a lot of forms, these all belong within the protection domain of the present utility model.

Claims

1. one kind prevents the collapse structure in hole of boulder bed boring, it is characterized in that this structure is the mud cortex that is put on the boulder bed borehole wall.

2. the collapse structure in hole of boulder bed boring that prevents according to claim 1 is characterized in that the thickness of described mud cortex is 30-60mm.