CN207701158U - A kind of composite hollow grouted anchor bar - Google Patents

Abstract

The utility model discloses a composite hollow grouting anchor, which comprises an anchor, a movable steel sheet and a backing plate; the anchor is a three-layer composite pipe, the middle layer is a steel pipe, and the inner wall of the steel pipe is fixedly inserted with a second An FRP pipe, the outer wall of the steel pipe is fixedly fitted with a second FRP pipe, and the pipe wall of the anchor rod is provided with a number of grouting holes that run through the first FRP pipe, the steel pipe and the second FRP pipe at the same time; the movable steel pipe The sheet is arranged at the front end of the anchor rod, and the backing plate is arranged at the tail end of the anchor rod. The utility model adopts the composite hollow grouting anchor rod improved by the above technical scheme to combine FRP and steel pipes, make full use of their respective outstanding performances, and ensure the shear resistance of the anchor rod while improving the tensile and strength problems; and design, Improve some structural details of the anchor and enhance the overall pull-out performance of the anchor.

Description

A composite hollow grouting anchor

technical field

The utility model belongs to the anchor technology, in particular to a composite hollow grouting anchor rod.

Background technique

The application of FRP composite materials in the field of civil engineering is growing rapidly. It can be used for earthquake resistance and reinforcement of columns, walls, beams, panels and panels. New reinforced components, structural forms and structural systems are also being researched, developed and applied.

At present, many companies at home and abroad have their own FRP anchor products. Among them, there are two types of FRP anchor rods: one is an integral full-thread structure; the other is a separate structure, that is, the tail thread and the FRP rod body pass through a certain connected in the form of. FRP anchors are also widely used in practical engineering. Since FRP is a crystalline material, the longitudinal and transverse strengths are relatively large. Traditional prestressed anchors are not suitable for FRP tie rods, otherwise the anchorage will be caused by too low transverse strength. Premature failure in the area, especially for grouted anchors with a hollow interior, the use of FRP anchors is more likely to lead to their strength failure. Therefore, the development of prestressed anchors combined with FRP materials is an urgent problem to be solved.

Utility model content

The technical problem solved by the utility model is to provide a new type of composite hollow grouting anchor for the defect of insufficient strength caused by the low transverse strength of the existing FRP anchor. Strength, while ensuring the reliability of anchor bolt anchoring.

The utility model adopts following technical scheme to realize:

A composite hollow grouting anchor, comprising an anchor 1, a movable steel sheet 2 and a backing plate 3;

The anchor rod 1 is a three-layer composite pipe, the middle layer is a steel pipe 13, the inner wall of the steel pipe 13 is fixedly inserted with a first FRP pipe 11, and the outer wall of the steel pipe 13 is fixedly fitted with a second FRP pipe 12. The pipe wall of the anchor rod 1 is provided with a number of grouting holes 101 that run through the first FRP pipe 11, the steel pipe 13 and the second FRP pipe 12 at the same time;

The movable steel sheet 2 is arranged at the front end of the anchor rod 1 , and the backing plate 3 is arranged at the tail end of the anchor rod 1 .

Further, the first FRP pipe 11 and the second FRP pipe 12 are respectively fixedly bonded to the steel pipe 13 by epoxy resin cement.

Further, the thickness of the first FRP pipe 11 is greater than the thickness of the second FRP pipe 12 .

Preferably, the thickness of the first FRP pipe 11 is 2 mm, and the thickness of the second FRP pipe 12 is 1 mm.

Preferably, the steel pipe 13 has a thickness of 2 mm.

Preferably, the diameter of the grouting hole 101 is 5 mm.

In a composite hollow grouting bolt of the present utility model, the movable steel sheets 2 are two groups, and the front ends of the two groups of movable steel sheets are hinged together, and are barbed toward the tail end of the bolt. The end barbs are respectively embedded in the positioning holes 102 provided on the side wall of the front end of the anchor rod.

The utility model adopts the composite hollow grouting anchor rod improved by the above technical scheme to combine FRP and steel pipes, make full use of their respective outstanding performances, and ensure the shear resistance of the anchor rod while improving the tensile and strength problems; and design, Improve some structural details of the anchor, enhance the overall pull-out performance of the anchor, and specifically produce the following beneficial effects:

(1) The main structure of the anchor bolt is divided into three layers of casing, the outer layer and inner layer are FRP pipes, the thickness of which are 2mm and 1mm respectively, and the middle layer is 2mm thick steel pipe. The steel pipe and mud enhance the corrosion resistance and durability of the steel pipe; the middle steel pipe makes up for the lack of shear capacity of the FRP pipe.

(2) There are 2-4 grouting holes with a diameter of 5mm randomly distributed on the wall of the anchor rod, so that the inner and outer grouts of the pipe are connected, and the grout is fully filled to realize the concrete pouring in the pouring area around the grouting anchor rod. In the slurry, the pores are distributed as evenly as possible.

(3) There are two groups of movable steel sheets at the bottom of the anchor rod, and the size of the steel sheets is about 23.9mm. When the bottom of the bolt is stressed, the steel sheet can open a certain angle to enhance the friction of the bolt in the slurry and improve the pull-out resistance. When there is no force, it is hung on the pole wall, which is convenient for storage and transportation.

As mentioned above, on the basis of enhancing the overall strength of the anchor rod, the utility model combines traditional materials with new materials to improve the durability and corrosion resistance of the anchor rod.

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

Description of drawings

Fig. 1 is a front view of a composite hollow grouting anchor in the embodiment.

Fig. 2 is a cross-sectional view of a composite hollow grouting anchor rod in the embodiment.

Fig. 3 is a schematic diagram of anchoring of a composite hollow grouting anchor in the embodiment.

Numbers in the figure: 1-anchor, 101-grouting hole, 102-positioning hole, 11-first FRP pipe, 12-second FRP pipe, 13-steel pipe, 2-movable steel sheet, 3-backing plate, 4 - Anchor pouring area.

Detailed ways

Example

Referring to Fig. 1 and Fig. 2, a kind of composite hollow grouting anchor rod in the illustration is the preferred scheme of the present utility model, specifically comprises anchor rod 1, movable steel sheet 2 and backing plate 3, wherein, the main body of anchor rod 1 is Three-layer composite structure pipe, wherein the middle layer is a steel pipe 13, the inner wall of the steel pipe 13 is fixedly inserted with the first FRP pipe 11, and the outer wall of the steel pipe 13 is fixedly fitted with a second FRP pipe 12, between the first FRP pipe 11 and the steel pipe 13 1. The second FRP pipe 12 and the steel pipe 13 are bonded and fixed into one body by epoxy resin cement. In the grouting hole 101 of the pipe 12, after the anchor rod 1 is inserted into the anchoring borehole, concrete grout is injected into the hollow anchor rod, and the concrete grout fills the anchoring pouring area around the anchor rod through the grouting hole 101 Finally, the anchor rod is embedded in the concrete slurry as a whole, and the anchoring construction is completed after the concrete slurry solidifies.

In order to ensure that the anchoring area formed by grouting is evenly filled, it should be ensured that the grouting holes 101 are evenly distributed on the outer wall of the anchor rod. On the premise of ensuring the strength of the anchor rod, 2-4 holes with a diameter of 5mm grouting hole 101 .

The front end of the anchor rod 1 in this embodiment is provided with a movable steel sheet 2, and the front ends of two groups of movable steel sheets 2 are hinged together to form a sharp angle, the tip faces the front end of the anchor rod 1, and the tail end of the movable steel sheet 2 faces the bottom of the anchor rod 1. The tail end is barbed and opened, and positioning holes 102 are provided on the front and side walls of the anchor rod 1. The tail ends of the movable steel sheets 2 are respectively inserted into the positioning holes 102, and the movable steel sheets are hung on the front end of the anchor rod. . The tip of the movable steel sheet 2 facilitates the smooth insertion of the anchor rod 1 into the anchor borehole. At this time, the tail end of the movable steel sheet 2 is retracted into the anchor rod. In the process of grouting into the anchor rod, or the anchor rod When receiving the external force of pulling out, the tail end of the movable steel sheet 2 will open a certain angle to both sides, and the barbs are used to further enhance the friction between the anchor rod and the anchorage area, and improve the pull-out resistance of the anchor rod.

The tail end of the anchor rod 1 is provided with a backing plate 3, and the backing plate 3 is fixed around the outer wall of the anchor rod. After the anchor rod 1 is inserted into the anchor hole, the back plate 3 is attached to the ground around the anchor hole. The position of the anchor rod 1 is limited to prevent the anchor rod 1 from being inserted into the anchor borehole as a whole.

In actual production and application, the second FRP pipe 12 is located on the inner wall of the steel pipe 13, which plays a role of isolating the steel pipe from mud, enhancing the corrosion resistance and durability of the steel pipe, while the first FRP pipe 11 is located on the outer wall of the steel pipe 13, and is connected with the steel pipe 13. As the main force bearing structure of the anchor rod, the thickness of the first FRP pipe 11 can be greater than the thickness of the second FRP pipe 12, and the thickness of the steel pipe 13 is 2mm. Preferably, the thickness of the first FRP pipe 11 is 2mm, and the thickness of the second FRP pipe 11 is 2mm. The thickness of the FRP pipe 12 is 1 mm.

As shown in Figure 3, during the anchoring construction process of a composite hollow grouting anchor in this embodiment, a drilling rig is first used to drill a hole in the anchoring area, and then the front end of the anchor 1 is inserted into the anchoring hole, and the pad The position of the plate 3 is limited, and then the concrete slurry is poured into the hollow cavity of the anchor 1, and the concrete slurry is filled into the anchor pouring area 4 on the outer periphery of the anchor through the grouting hole 101 on the anchor 1, and is also filled with the anchor 1 At this time, the movable steel sheet 2 at the front end of the anchor rod 1 is further opened to both sides under the action of pouring pressure, so as to improve the pullout resistance of the anchor rod. After the slurry is solidified, the anchor rod is embedded in the anchoring pouring area 4 and the surrounding underground as a whole, and the anchoring construction is completed.

The technical solutions provided by the embodiments of the present invention have been introduced in detail above. In this paper, specific examples have been used to illustrate the principles and implementation methods of the embodiments of the present invention. The descriptions of the above embodiments are only applicable to help understand the present invention. The principle of the embodiment; at the same time, for those of ordinary skill in the art, according to the embodiment of the utility model, there will be changes in the specific implementation and the scope of application. limits.

Claims (7)

1. a kind of composite hollow grouted anchor bar, it is characterised in that：Including anchor pole (1), movable steel disc (2) and backing plate (3)；

The anchor pole (1) is three-layer composite pipe, and middle layer is steel pipe (13), and the inner wall fixation of the steel pipe (13) is fitted with first FRP manages (11), and the outer wall fixing sleeve of the steel pipe (13) manages (12) equipped with the 2nd FRP, the anchor pole (1) if tube wall be equipped with Injected hole (101) dry while that (12) are managed through the first FRP pipes (11), steel pipe (13) and the 2nd FRP；

The activity steel disc (2) is arranged in the front end of anchor pole (1), tail end of backing plate (3) setting in anchor pole (1).

2. a kind of composite hollow grouted anchor bar according to claim 1, the first FRP pipes (11) and the 2nd FRP pipes (12) it is bonded respectively by the way that epoxy gluing agent and steel pipe (13) are fixed.

3. the thickness of a kind of composite hollow grouted anchor bar according to claim 2, the first FRP pipes (11) is more than second FRP manages the thickness of (12).

4. the thickness of a kind of composite hollow grouted anchor bar according to claim 3, the first FRP pipes (11) is 2mm, institute The thickness for stating the 2nd FRP pipes (12) is 1mm.

5. the thickness of a kind of composite hollow grouted anchor bar according to claim 4, the steel pipe (13) is 2mm.

6. a kind of composite hollow grouted anchor bar according to claim 1, a diameter of 5mm of the injected hole (101).

7. a kind of composite hollow grouted anchor bar according to any one of claim 1-6, the activity steel disc (2) is two The front end of group, two groups of activity steel discs is hinged, and the tail end towards anchor pole opens setting in hangnail, and tail end hangnail is inlaid in respectively In the location hole (102) that anchor pole front end side wall opens up.