锚喷支护施工工艺措施.docx

锚喷支护施工工艺措施
Bolt shotcrete support construction technology measures
In order to ensure the quality of anchor bolt, strengthen field quality control and standardize bolt shotcrete support, the following measures are formulated.
First, bolt construction technology measures
1 、 construction process
Construction process of mortar bolt
Construction process flow chart of mortar bolt (first grouting and post inserting bar)
Block diagram of construction process of mortar bolt (first post grouting)
2, construction process measures
(1) field test;
Before the construction of the anchor rod, the following anchor work is carried out:
A and through laboratory test, 2~3 sets of mortar mixture ratio meeting the design requirements were screened, and the experiment outline was approved for production test.
B, compactness of grouting test: selection and field bolt
diameter and length of anchor hole, aperture and tilt of the same bolt and a plastic tube (or pipe), using the same and grouting materials and mixing ratio of cement grout or cement mortar, grouting technology and grouting construction site according to the same, maintenance 7 after check pactness of the pipe section. Different types and lengths of bolts need to be tested. The test plan submitted to the supervisor for approval, and the test was conducted according to the approved plan, the supervisor in the process of test site. Test section grouting density is not less than 90%, otherwise, it is necessary to further improve the test process, and then test, until 90% or more of the grouting density.
(2) make hole
A, bit selection to meet the requirements, drilling points have obvious signs, the opening position in any direction deviation should be less than 100mm.
B, the direction of the bore of the anchor hole meets the requirements of the construction drawing. The construction drawings are not specified, the system of bolt hole axis direction should be perpendicular to the excavation surface smooth; hole a