CN205605114U - Karst karst area prestressed anchorage cable drilling equipment - Google Patents

Abstract

The utility model discloses a prestressed anchor cable drilling device in karst karst areas, which comprises a machine base, bearing seats and sleeve fixing seats are respectively arranged at both ends of the top of the machine base, and the steel sleeve is fixed on the sleeve fixing seats. One end of the drill connector is rotationally connected with the bearing in the bearing seat, and the other end is fixedly connected with the hollow drill pipe through the flange, and the hollow drill pipe penetrates the steel sleeve and is connected with the drill bit. The utility model can realize rapid drilling in karst karst areas to meet the requirements of prestressed anchor cable construction, and the drilling depth can be adjusted according to actual needs. The utility model is simple in operation, fast in installation, safe and reliable in use, and can effectively improve construction efficiency. , shorten the construction period, and can be used repeatedly, saving construction costs and achieving the purpose of reducing costs and increasing efficiency.

Description

A prestressed anchor cable drilling device in karst karst area

technical field

The utility model relates to a prestressed anchor cable drilling device in a karst area, which belongs to the technical field of building construction.

Background technique

At present, in view of the common geological phenomena such as karst caves and underground rivers in karst karst areas, the construction of support piles is very difficult when encountering ultra-deep and super-large-diameter karst caves or underground rivers. Especially when the groundwater around the prestressed anchor cable construction site is rich and the construction period is tight, and the surrounding area of the support pile construction is full of residential buildings, there are unfavorable factors such as collapse holes, shrinkage holes, and water seepage, and the soil bears The pressure is greatly increased, resulting in the conventional prestressed anchor cable construction technology unable to overcome the construction requirements under karst geological conditions. Therefore, it is urgent to design a prestressed anchor cable drilling device in karst karst areas to ensure that the prestressed anchor cable construction meets the design and specification requirements.

Utility model content

The purpose of the utility model is to provide a prestressed anchor cable drilling device in karst karst areas with simple structure, fast drilling, safety and reliability, and can be used repeatedly, so as to overcome the deficiencies of the prior art.

The technical scheme of the utility model: a prestressed anchor cable drilling device in karst karst areas, including a machine base, bearing seats and sleeve fixing seats are respectively arranged at both ends of the top of the machine base, and the steel sleeve is fixed on the sleeve fixing seats On the one hand, one end of the drill rig connecting head is connected to the bearing in the bearing housing in rotation, and the other end is fixedly connected to the hollow drill pipe through the flange, and the hollow drill pipe is connected to the drill bit after passing through the steel sleeve.

Both ends of the steel sleeve or the hollow drill rod are respectively provided with internal threads and external threads, which facilitates the extension and connection of the remaining steel sleeves or hollow drill rods.

The length of the steel sleeve is shorter than that of the hollow drill rod, which facilitates the connection between the hollow drill rod and the drill bit.

The maximum diameter of the drill bit is 5mm-8mm larger than the diameter of the steel sleeve, which is convenient for the drilling rig to move the steel sleeve.

Compared with the prior art, the utility model has the advantages that: the utility model can realize rapid drilling in karst karst areas to meet the requirements of prestressed anchor cable construction, and the drilling depth can be adjusted according to actual needs, and the operation is simple , Fast installation, safe and reliable use, can also effectively improve construction efficiency, shorten the construction period, and can be used repeatedly, saving construction costs, and achieving the purpose of reducing costs and increasing efficiency.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the structural representation of hollow drill rod of the present utility model;

Fig. 3 is a structural schematic diagram of a steel sleeve in the utility model.

Explanation of reference numerals: 1-machine base, 2-bearing housing, 3-sleeve fixing seat, 4-drilling rig connector, 5-flange, 6-hollow drill pipe, 7-steel sleeve, 8-drill bit.

detailed description

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments.

Embodiment of the present utility model: the structural diagram of the prestressed anchor cable drilling device in the karst karst area is shown in Figure 1, including a machine base 1, and a bearing seat 2 and a sleeve fixing seat 3 are respectively arranged at both ends of the top of the machine base 1 , the steel sleeve 7 is fixed on the sleeve fixing seat 3, one end of the drill connector 4 is connected to the bearing in the bearing seat 2 for rotation, and the other end is fixedly connected to the hollow drill rod 6 through the flange 5, and the hollow drill rod 6 penetrates into the steel After the sleeve 7 is connected with the drill bit 8, the length of the steel sleeve 7 is less than the length of the hollow drill rod 6, which facilitates the connection between the hollow drill rod 6 and the drill bit 8, and the maximum diameter of the drill bit 8 is 5 mm to 8 mm larger than the diameter of the steel sleeve 7 , to facilitate the drilling rig to move the steel sleeve. Referring to Fig. 2 and Fig. 3, both ends of the steel sleeve 7 or the hollow drill rod 6 are respectively provided with internal threads and external threads, which facilitates the extension and connection of the remaining steel sleeves 7 or hollow drill rods 6 .

When using the utility model to carry out prestressed anchor cable construction in karst karst areas, the following steps can be adopted:

a. Anchor hole surveying, foundation pit construction is excavated and supported at the same time, that is, one layer is excavated, one layer is sprayed and anchored, and one layer is supported for construction. To the end; b, according to the elevation of the anchor hole, accurately release the position of the anchor cable hole according to the design requirements and make an obvious mark; c, connect the drilling rig with the drilling rig connector 4 in the utility model; d, in order to ensure the anchor hole Diameter, it is required that the diameter of the drill bit 8 actually used shall not be less than the design aperture (150mm). In order to ensure the depth of the anchor hole, the actual drilling depth is required to be greater than the design depth by 0.5m or more; e. A single-section mechanism (that is, a steel sleeve 7 and a hollow drill rod 6) is used to drill holes, and the diameter of the hollow drill rod 6 is 80mm, the maximum diameter of the drill bit 8 is 155-158mm, and the length is 2.0m; f. When the drilling hole is ≧1.5m, connect the long steel sleeve 7 and the hollow drill pipe 6 respectively, and then proceed to the next stage of prestressed anchor cable hole Construction; g. Repeat the above steps until the prestressed anchor cable hole is constructed to the design position; f. During the drilling process, the stratum change of each hole, the drilling status (pressure on the hole, drilling speed), groundwater and some special circumstances Make on-site construction records; h. During anchor cable construction, the drilling angle must be strictly controlled to ensure that the hole position and inclination are correct and the machine is stable. During the construction process, timely detect the inclination of the hole, and the inclination deviation is not more than 3%, and take reasonable corrective measures according to the drilling needs; i. After the drilling reaches the design depth, the drilling cannot be stopped immediately. The bottom of the hole pinches out and cannot reach the designed pore size. There must be no ballast and sticky water on the wall of the drilled hole, and it must be cleaned. After the drilling is completed, use high-pressure air (wind pressure 0.2-0.4MPa) to remove all the rock powder and water in the hole out of the hole, so as not to reduce the cement. The bond strength between the mortar and the rock-soil mass of the hole wall must not be washed with high-pressure water. j. After the anchor hole drilling is completed, the next process can only be carried out after passing the on-site supervision inspection. The hole diameter and hole depth inspection generally adopt the design hole diameter, drill bit and standard drill pipe to inspect the hole under the condition of the on-site supervision station. It is required that the drill bit advances smoothly during the hole inspection process without impact or vibration, and the inspection delivery length of the drilling tool meets the designed anchor hole. Depth, drill back is required to be smooth, and there is no obvious phenomenon of splashing dust and water in the high-pressure wind blowing test. At the same time, it is required to recheck the anchor hole position, inclination and orientation. After all the anchor hole construction sub-items are qualified, the anchor hole drilling inspection can be considered qualified.

Claims (4)

1. A prestressed anchor cable drilling device in karst karst areas, including a machine base (1), characterized in that bearing seats (2) and sleeve fixing seats (3) are respectively arranged at both ends of the top of the machine base (1) ), the steel sleeve (7) is fixed on the sleeve holder (3), one end of the drill joint (4) is connected to the bearing in the bearing housing (2) for rotation, and the other end is connected to the hollow drill pipe through the flange (5) (6) Fixed connection, the hollow drill rod (6) penetrates the steel sleeve (7) and connects with the drill bit (8). 2. The prestressed anchor cable drilling device in karst karst area according to claim 1, characterized in that: the two ends of the steel sleeve (7) or the hollow drill rod (6) are respectively provided with internal threads and external threads . 3. The prestressed anchor cable drilling device in karst areas according to claim 2, characterized in that: the length of the steel sleeve (7) is shorter than the length of the hollow drill rod (6). 4. The prestressed anchor cable drilling device in karst karst area according to claim 1, characterized in that: the maximum diameter of the drill bit (8) is larger than the diameter of the steel sleeve (7).