CN204139169U - A kind of multi-layer helical blade self-drilling soil anchor bolt - Google Patents

Abstract

A kind of multi-layer helical blade self-drilling soil anchor bolt, comprise front end anchor rod body (1), described front end anchor rod body (1) is provided with front end helical blade (4-1) on the external surface of apex point one end, the sidewall of front end anchor rod body (1) is positioned near front end helical blade (4-1) and offers slurry outlet (5), the other end of front end anchor rod body (1) is threaded connection position (6) and is connected with one end of stage casing anchor rod body (2), the other end of stage casing anchor rod body (2) is connected with the one end lengthening anchor pole (8) by adapter sleeve (7), the external surface of stage casing anchor rod body (2) is provided with helical blade (4-2), the utility model is rational in infrastructure, in soft clay area, this blade has extremely strong penetration power, construction technology is safe and reliable, increase contact area, enhance anchored force, improve efficiency of construction and construction quality, ensure that it more effectively can improve the uplift resistance of anchor pole in different soil.

Description

A self-drilling soil bolt with multi-layer spiral blades

technical field

The utility model relates to an anchor rod, in particular to a multilayer helical blade self-drilling soil anchor rod, which belongs to the technical field of drilling and anchoring. the

Background technique

For buildings or structures buried in the basements of buildings with high groundwater levels, such as subways, underground shopping malls, civil air defense fortifications, large pools, and wave-dispelling pools at the bottom of dams, they must not only bear the weight of the structure, but also bear the impact caused by the high groundwater level. buoyancy on the bottom of the pit. When the buoyancy force is large enough to overcome the weight of the structure, floating, tilting or damage will occur, so the harmful vertical displacement caused by buoyancy must be effectively controlled in the structural design. the

At present, the anti-floating design is widely used in engineering. The method of anti-floating piles and anti-floating anchors is mainly used. Both the anti-floating piles and anti-floating anchors are reinforced concrete structures. Due to the low strength of steel bars, the amount of steel bars used is relatively large, and the cost high. The construction process is complicated, the construction period is long, and the construction quality is difficult to guarantee. In addition, at this stage, anti-floating piles and anti-floating anchors must be carried out before the construction of the project foundation. In the case of strict construction period requirements or special requirements for basement construction time, for example: construction must be carried out during the dry season, anti-floating piles and anti-floating anchors must be used. Floating anchors can no longer meet the above requirements. The traditional single-layer helical anchor is easy to drill into the soil layer, but its anchoring strength is low. The full-length helical anchor has high anchoring strength, but it is difficult to drill into the soil layer, which cannot meet the construction needs. the

For example, the Chinese patent authorization publication number is: CN203685063U, and the announcement date is: July 2, 2014. The utility model patent discloses a kind of auger drill pipe and a liquid inlet device for the auger drill pipe. The liquid inlet pipe body is integrally arranged or connected with the rod body. The surface of the liquid inlet pipe body is provided with a feed port that communicates with the auger pipe feeding channel through its inner hole. During construction, the auger pipe is poured into the The protective wall fluid can reach the bottom of the drill bit connected to the lower end of the rod body through the feeding port of the liquid inlet device through the feeding channel of the rod body, so that the wall protection fluid can be replenished in time when the drill pipe is lifted. But this device is single, and it is difficult to drill into the soil layer, and the anchoring contact area is small, and the pullout resistance is insufficient. the

Contents of the invention

The purpose of this utility model is to aim at the defects and deficiencies of the existing anti-floating engineering of the basement floor of the building in the soft soil area, such as the simple structure of the anchor rod, the small anchoring contact area, and insufficient pull-out resistance, and now provides a reasonable structure and convenient construction. A multi-layer spiral blade self-drilling soil bolt with high drilling efficiency, large anchoring contact area and strong pull-out resistance. the

In order to realize the purpose of this utility model, the technical solution of this utility model is: a kind of multilayer helical blade self-drilling soil bolt, comprising the front end bolt body, the front end of the front end bolt body is a closed conical shape, the A front-end helical blade is provided on the outer surface of the front-end anchor rod body close to the drill tip, and a slurry hole is provided on the side wall of the front-end anchor rod body near the front-end helical blade. The other end of the front-end anchor rod body is connected to the One end of the middle anchor rod body is connected, and the other end of the middle anchor rod body is connected with one end of the extended anchor rod through a connecting sleeve. There are two or more middle anchor rod bodies, and the outer surface of the middle anchor rod body is provided with The helical blade, the helical direction of the helical blade at the front end is the same as that of the helical blade, and a slurry outlet hole is opened on the side wall of the bolt body in the middle section near the helical blade. the

The front end anchor rod body, the middle anchor rod body and the end anchor rod body are all made of seamless hollow steel pipes with a diameter of 3 cm to 7 cm. the

The front helical blades are three or more helical blades, the radius of the blade outer circle of the front end helical blade near the drill tip is smaller than the blade outer circle radius of the end far away from the drill tip, and the distance between each helical blade is 12 cm- 18 cm, the maximum outer circle radius of the front helical blade is 35 cm to 60 cm, and the helical angle of the front helical blade is 45 degrees. the

The spiral blades are three or more spiral blades, the distance between adjacent spiral blades is 80 cm-120 cm, the blade outer circle radius of the spiral blades is 35 cm-60 cm, and the spiral angle of the spiral blades is 45 degree. the

The grout outlet is a circular hole with a diameter of 0.5 cm to 1.5 cm, and the grout outlet is evenly opened on the outer wall of the front end anchor rod body and the middle anchor rod rod body. the

The beneficial effects of the utility model are:

1. The utility model is formed by connecting and combining the front end anchor rod body, the middle anchor rod body and the end anchor rod body. In order to increase the length of the anchor rod, two or more middle anchor rod bodies are sequentially butted together. The rod body adopts multiple helical blades to improve the drilling efficiency.

2. The structure of the utility model is reasonable, the construction period is short, and the cost is low. In the soft soil area, the blade has a strong penetrating force, which reduces the difficulty of drilling. Compared with the anchor body, it is easier to construct, the construction process is safe and reliable, the contact area is increased, the anchoring force is enhanced, the construction efficiency and construction quality are improved, and it is guaranteed that it can more effectively improve the pullout force of the anchor rod in different soil layers. Improve the effectiveness of anti-floating works. the

Description of drawings

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

Fig. 2 is a schematic diagram of A-A in Fig. 1 . the

In the figure: the front end bolt body 1, the middle bolt body 2, the end bolt body 3, the front helical blade 4-1, the helical blade 4-2, the slurry hole 5, the threaded connection part 6, the connecting sleeve 7, lengthened Anchor 8. the

Detailed ways

The utility model will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. the

Referring to Fig. 1 and Fig. 2, a kind of multilayer helical blade self-drilling soil bolt of the present utility model comprises a front end bolt body 1, and the front end of the front end bolt body 1 is a closed conical shape, and the front end bolt body 1 There is a front-end helical blade 4-1 on the outer surface near the end of the drill tip, and a slurry hole 5 is opened on the side wall of the front-end anchor rod body 1 near the front-end helical blade 4-1. One end is connected to one end of the middle anchor rod body 2 through the threaded connection part 6, and the other end of the middle anchor rod body 2 is connected to one end of the extended anchor rod 8 through the connecting sleeve 7, and the middle anchor rod body 2 is two or two Above, the outer surface of the middle bolt body 2 is provided with a helical blade 4-2, the helical direction of the front end helical blade 4-1 is the same as that of the helical blade 4-2, and the side wall of the middle bolt body 2 is located on the helical blade 4. A pulp outlet 5 is opened near -2. the

The front end anchor rod body 1, the middle anchor rod body 2 and the end anchor rod body 3 are all made of seamless hollow steel pipes with a diameter of 3 cm to 7 cm. the

The front-end helical blade 4-1 is three or more than three helical blades, and the radius of the outer circle of the blade at the end of the front-end helical blade 4-1 near the drill tip is smaller than the radius of the outer circle of the blade at the end far away from the drill tip. The distance between them is 12 centimeters-18 centimetres, the maximum outer circle radius of the blade of the front end helical blade 4-1 is 35 centimeters-60 centimeters, and the helical angle of the front end helical blade 4-1 is 45 degrees. the

The spiral blade 4-2 has three or more spiral blades, the distance between adjacent spiral blades 4-2 is 80 cm-120 cm, and the radius of the blade outer circle of the spiral blade 4-2 is 35 cm-60 cm. cm, and the helical angle of the helical blade 4-2 is 45 degrees. the

The slurry outlet hole 5 is a circular hole with a diameter of 0.5 cm-1.5 cm, and the slurry outlet hole 5 is evenly opened on the outer wall of the front end anchor rod body 1 and the middle anchor rod body 2 . the

Referring to Fig. 1, the front end anchor rod body 1 is made of seamless hollow steel pipe, the front end of the front end anchor rod body 1 is a closed conical shape, and the front end helical blade 4- 1. The front end helical blade 4-1 is three or more than three helical blades, and the radius of the outer circle of the blade at the end of the front end helical blade 4-1 near the drill tip is smaller than the outer radius of the blade at the end far away from the drill tip, and the distance between each helical blade 12 cm-18 cm, the blade maximum outer circle radius of the front end helical blade 4-1 is 35 cm-60 cm, and the helical angle of the front end helical blade 4-1 is 45 degrees. On the side wall of the front-end anchor rod body 1 and near the front-end helical blade 4-1, a slurry outlet 5 is opened, and the slurry outlet 5 is round and uniformly arranged. the

The middle anchor rod body 2 is made of seamless hollow steel pipe. The outer surface of the middle anchor rod body 2 is provided with a spiral blade 4-2. A pulp outlet hole 5 is opened on the side wall of the rod body 2 and near the helical blade 4-2. The end of the front end anchor rod body 1 is connected to one end of the middle anchor rod body 2 through the threaded connection part 6, and the other end of the middle anchor rod body 2 is connected to one end of the extended anchor rod 8 through the connecting sleeve 7, in order to further improve the anchor rod The overall length of the anchor rod body 2 in the middle section can be formed by butting two or more rods in sequence. On the side wall of the middle anchor rod body 2 and near the helical blade 4-2, there is a slurry outlet 5. The slurry outlet 5 is a circular hole with a diameter of 0.5 cm to 1.5 cm. The aperture is not too large and should be controlled at about 1 cm. Can increase its ejection capacity, also can prevent soil mass from blocking the grout hole 5 when drilling. the

The specific steps of a multi-layer spiral blade self-drilling soil anchor construction method of the present utility model are as follows: first, the anchor is connected, and the end of the front end anchor body 1 is connected with one end of the middle anchor body 2 through the threaded connection part 6, The other end of the middle anchor rod body 2 is connected to one end of the extended anchor rod 8 through the connecting sleeve 7 , and one or more middle anchor rod rod bodies 2 are connected between the front end anchor rod body 1 and the extended anchor rod 8 . The multi-layer helical blade soil bolt that connects subsequently is installed on the rock bolt rig, and the height and the turning angle of the soil bolt are adjusted. Then the selected position is drilled, the drill point of the front end anchor rod body 1 is aimed at the predetermined position, and the start rock bolt rig starts to drill the soil, so that the front end helical blade 4-1 and the helical blade 4-2 all enter in the soil layer. After the front helical blade 4-1 and the helical blade 4-2 have all entered the soil layer, the cement slurry is injected through the middle cavity of the soil anchor rod under high pressure, so that the cement slurry is sprayed out from the grout hole 5 and enters the surrounding soil layer. Stop drilling after reaching the predetermined depth, and continue spraying cement slurry until saturated. The high-pressure cement slurry squeezes the soil around the front helical blade 4-1 and the helical blade 4-2, so that the cement slurry wraps the helical blade and the anchor rod respectively, and solidifies into a series of anchor bodies. the

The utility model has the advantages of reasonable structure, short construction period and low cost, and the blade has extremely strong penetrating power in soft soil areas, which reduces the difficulty of drilling. Compared with the traditional anchor body, the anchor body formed by the construction of the utility model is easier to construct, the construction technology is safe and reliable, the contact area is increased, the anchoring force is enhanced, the construction efficiency and construction quality are improved, and it is guaranteed to be more effective. It can greatly improve the pull-out resistance of anchor rods in different soil layers and the effectiveness of anti-floating projects. the

Claims (5)

1. a multi-layer helical blade self-drilling soil anchor bolt, comprise front end anchor rod body (1), the front end of front end anchor rod body (1) is closed taper shape, it is characterized in that: described front end anchor rod body (1) is provided with front end helical blade (4-1) on the external surface of apex point one end, the sidewall of front end anchor rod body (1) is positioned near front end helical blade (4-1) and offers slurry outlet (5), the other end of front end anchor rod body (1) is threaded connection position (6) and is connected with one end of stage casing anchor rod body (2), the other end of stage casing anchor rod body (2) is connected with the one end lengthening anchor pole (8) by adapter sleeve (7), stage casing anchor rod body (2) is more than two or two, the external surface of stage casing anchor rod body (2) is provided with helical blade (4-2), front end helical blade (4-1) is identical with the hand of spiral of helical blade (4-2), the sidewall of stage casing anchor rod body (2) is positioned near helical blade (4-2) and offers slurry outlet (5).

2. a kind of multi-layer helical blade self-drilling soil anchor bolt according to claim 1, is characterized in that: institute's front end anchor rod body (1), stage casing anchor rod body (2) and latter end anchor rod body (3) all adopt seamless hollow steel pipe, and its diameter is 3 centimetres-7 centimetres.

3. a kind of multi-layer helical blade self-drilling soil anchor bolt according to claim 1, it is characterized in that: described front end helical blade (4-1) is the three above helical blades in Dao Huo tri-road, the blade exradius of front end helical blade (4-1) near apex point one end is less than the blade exradius away from apex point one end, distance between per pass helical blade is 12 centimetres-18 centimetres, the maximum exradius of blade of front end helical blade (4-1) is 35 centimetres-60 centimetres, and the spiral angle of front end helical blade (4-1) is 45 degree.

4. a kind of multi-layer helical blade self-drilling soil anchor bolt according to claim 1, it is characterized in that: described helical blade (4-2) is the three above helical blades in Dao Huo tri-road, distance between adjoining spiral blade (4-2) is 80 centimetres-120 centimetres, the blade exradius of helical blade (4-2) is 35 centimetres-60 centimetres, and the spiral angle of helical blade (4-2) is 45 degree.

5. a kind of multi-layer helical blade self-drilling soil anchor bolt according to claim 1, it is characterized in that: described slurry outlet (5) for diameter be the circular hole of 0.5 centimetre-1.5 centimetres, and slurry outlet (5) is evenly opened on the outer wall of front end anchor rod body (1) and stage casing anchor rod body (2).