CN107620603A - A kind of novel slurry filling anchor pole with steel loop bar - Google Patents

Abstract

The invention relates to a new type of grouting anchor rod with a steel sleeve rod, which includes a rod body, anchor ends and anchor heads respectively located at both ends of the rod body, and a rod sleeve device outside the rod body, and is characterized in that: the rod body is circumferentially uniformly distributed The rod set is a multi-section cage structure, which is set outside the rod body. The rod set includes a node and a cage body. The node part is connected with the guide rail of the rod body by sliding fit. The cage body and the node are hinged, and each cage body is hinged in two stages. structure, when the new grouting anchor rod is loaded into the borehole and tightened and pressed with the anchor head, the cage body is compressed axially and expanded radially to contact and support the wall of the borehole. The hollow threaded steel anchor rod is modified by adding steel sleeve rods, and the steel sleeve rods are pressed tightly with the help of nuts. The steel rods are stretched out and directly contact with the supported rock mass to generate a certain friction force to ensure that the anchor rods are in grouting. Stability during the process, at the same time, after grouting, increase the overall tensile and shear capacity of the grouting material and the bolt, and improve the strength of the bolt support.

Description

A new type of grouting anchor rod with steel sleeve rod

technical field

The patent of the present invention is a new type of grouting anchor rod, specifically related to a new type of grouting anchor rod with a steel sleeve rod, which is suitable for mining projects and rocks such as coal mine roadway support, metal mine roadway support and tunnel engineering support. Soil engineering support field.

Background technique

At present, the grouting bolts used in mining engineering and geotechnical engineering mainly use hollow bolt bodies, anchor heads, backing plates, nuts, etc. to realize the anchoring of rock masses in excavated spaces in roadways or tunnels. However, the problems existing in the hollow bolts of the existing grouted bolts are: 1) the strength of the hollow rod body is low; The rock protection produces supporting force, the cohesive force is small, and the anchorage strength is low.

The main reason for the failure of grouting bolt support is that the grouting material is damaged by tension. The hollow bolt body of the grouting bolt does not directly contact the supported rock mass like the mechanical bolt, which produces friction support. The tensile strength of the cement mortar grouting material is less than its own compressive strength, far less than the tensile strength of the hollow rebar anchor rod; the compressive strength of the rebar is less than its own tensile strength, and less than the compressive strength of the grouting material strength. Since the hollow threaded steel bolt will be subjected to compressive stress perpendicular to the axial direction of the bolt body in the supported rock mass, thus forming a shearing effect on the bolt body, the function of the grouting material is to protect the grouted bolt from being Rock mass shear failure.

Contents of the invention

In order to overcome the shortcoming that the hollow bolt body of the grouting bolt is not in direct contact with the supported rock mass, and the grouting material of the grouting bolt is easily damaged by tension, which leads to the failure of the bolt, the invention provides a strip steel A new type of grouting anchor for the set rod.

The technical solution adopted by the present invention to solve the above-mentioned technical problems is a new type of grouting anchor rod with a steel sleeve rod, which includes a rod body, anchor ends and anchor heads respectively located at both ends of the rod body, and a rod sleeve device outside the rod body, It is characterized in that: the guide rails are evenly distributed around the rod body; the rod sleeve device is a multi-section cage structure, which is set outside the rod body. The rod sleeve device includes nodes and cage bodies. The joints are hinged, and each section of the cage adopts a two-section hinged structure. When the new grouting anchor rod is loaded into the drill hole and tightened with the anchor head, the cage body compresses axially and expands radially to contact and support the drill hole. hole wall.

Both ends of the rod body are threaded for fixing the anchor head and reinforcing the anchor section.

The anchoring section includes a nut, a grout stopper, a backing plate gasket and a grouting plug.

Both ends of the sleeve rod device are provided with ferrules, and the ferrules are respectively welded to the anchor head and the anchor segment.

The inner diameter of the ferrule is larger than the outer diameter of the rod but smaller than the outer diameters of the anchor head and the nut.

An installation hole is provided on the ferrule, and the steel rod is connected with the installation hole.

The contact point is a chain piece structure, and the chain piece is stuck in the track and can move along the track.

The cage body is composed of four steel rods uniformly distributed in the circumferential direction, and the steel rods are connected with rivets and then connected with chain pieces.

The alternate parts of the guide rails are uniformly distributed with slurry holes along the normal direction of the rod body.

The anchor head closes the upper port of the rod body through thread fit, and the anchor head has a slurry outlet.

The beneficial effects of the present invention are: the hollow threaded steel anchor rod is modified by adding steel sleeve rods, and the steel sleeve rods are pressed tightly with the help of nuts, and the steel rods are stretched out to directly contact with the supported rock mass to generate a certain friction force , to ensure the stability of the anchor during the grouting process, and at the same time, after the grouting, increase the overall tensile shear capacity of the grouting material and the anchor, and improve the strength of the anchor support.

Description of drawings

Accompanying drawing 1 is the overall structure schematic diagram of the present invention.

Accompanying drawing 2 is the schematic diagram of the structure of the anchor rod body.

Accompanying drawing 3 is A-A view of accompanying drawing 2.

Accompanying drawing 4 is the schematic diagram of track structure.

Accompanying drawing 5 is the schematic structural diagram of ferrule.

Accompanying drawing 6 is the structural representation of chain piece.

Accompanying drawing 7 is the structural schematic diagram of steel connecting rod.

Accompanying drawing 8 is the structural diagram of grouting plug.

detailed description

As shown in Figures 1-3, a new type of grouting anchor with a steel sleeve includes a rod body 1, anchor ends 2 and anchor heads 3 located at both ends of the rod body, and a rod sleeve device 4 outside the rod body. It is characterized in that: the guide rail 6 is evenly distributed around the rod body 1; the rod sleeve device 4 is a multi-section cage structure, which is set outside the rod body. The rod sleeve device includes a node and a cage body. The cage body is hinged with the nodes, and each section of the cage body adopts a two-stage hinged structure. When the new grouting anchor rod is loaded into the borehole and tightened with the anchor head, the cage body compresses axially, expands radially, and contacts And support the borehole wall. Both ends of the rod body 1 are threaded for fixing the anchor head 3 and reinforcing the anchor segment 2 . The anchoring section 2 includes a nut 7 , a grout stopper 8 , a backing plate 9 and a gasket 10 and a grouting plug 15 . Both ends of the sleeve rod device 4 are provided with ferrules 10, and the ferrules 10 are welded to the anchor head 3 and the anchor segment 2 respectively. The inner diameter of the ferrule 10 is larger than the outer diameter of the rod body 1 and smaller than the outer diameters of the anchor head 3 and the nut 7 . An installation hole is provided on the ferrule 10, and the steel rod 12 is connected with the installation hole.

As shown in FIGS. 4-8 , the contact point is a chain piece 14 structure, and the chain piece 14 is stuck in the track 6 and can move along the track 6 . The cage body is composed of four steel rods 12 uniformly distributed in the circumferential direction, and the steel rods 12 are connected with rivets 13 and then connected with chain pieces 14 . The alternate parts of the guide rails 6 are evenly distributed with the slurry outlet holes 5 along the normal direction of the rod body. The anchor head 3 is threaded to close the upper port of the rod body 1 , and the anchor head 3 has a grout hole 5 .

According to the required length of the grouting bolt, adjust the number of steel rods of the sleeve rod device. First, the anchor head 3 is fixed to the upper end of the rod body 1, the rod sleeve device 4 is placed on the rod body through the track 6 of the rod body 1, and the ferrule 11 and the anchor head 3 are fixed. After cleaning the grouting hole, insert the anchor rod into the grouting hole, and tighten the nut 7 with the provided tightening sleeve 15 until the sleeve rod device 4 is stretched and contacts the supported rock mass. Generate sufficient frictional force to ensure that the anchor rod is stably placed in the grouting hole; insert the grout stopper 8 and start grouting; After pulling out the grouting pipe, plug the lower port of the anchor rod with the grouting plug 16 .

Claims (10)

1. a kind of novel slurry filling anchor pole with steel loop bar, it is characterised in that be located at the body of rod both ends including the body of rod and respectively Anchored end and anchor head and the body of rod outside set lever apparatus, it is characterised in that：The circumferentially uniform guide rail of the body of rod；The loop bar Device is multisection type cage structure, is set in outside the body of rod, and set lever apparatus includes node and cage body, position of joints and the body of rod Guide rail sliding fit is connected, and cage body is hinged with node, and every section of cage body uses two-part articulated structure, when the novel slurry filling anchor pole When loading drilling, and fastening compression with anchor head, cage body is compressed axially, radial expansion, is contacted and is supported the wall of a borehole.

A kind of 2. novel slurry filling anchor pole with steel loop bar according to claim 1, it is characterised in that the body of rod both ends It is threaded, for the fixation of anchor head and the reinforcing of anchoring section.

A kind of 3. novel slurry filling anchor pole with steel loop bar according to claim 1, it is characterised in that the anchoring section bag Include nut, stop grouting plug, backing plate pad and grouting plug.

A kind of 4. novel slurry filling anchor pole with steel loop bar according to claim 1, it is characterised in that the set lever apparatus Both ends be provided with lasso, the lasso welds with anchor head, anchoring section respectively.

A kind of 5. novel slurry filling anchor pole with steel loop bar according to claim 4, it is characterised in that the lasso it is interior Footpath is more than the external diameter of rod body and is less than anchor head, the external diameter of nut.

6. a kind of novel slurry filling anchor pole with steel loop bar according to claim 4, it is characterised in that set on the lasso There is mounting hole, the steel shank is connected with mounting hole.

7. a kind of novel slurry filling anchor pole with steel loop bar according to claim 1, it is characterised in that the contact is chain Bar chip architecture, Chain link for chain grate are stuck in track, can be moved along track.

8. a kind of novel slurry filling anchor pole with steel loop bar according to claim 1, it is characterised in that the cage body is equal It is made up of four uniform steel stems of circumference, rivet interlacement is used between steel shank, then be connected with Chain link for chain grate.

9. a kind of novel slurry filling anchor pole with steel loop bar according to claim 1, it is characterised in that the guide rail is alternate Partly along the uniform slurry outlet of body of rod normal direction.

10. a kind of novel slurry filling anchor pole with steel loop bar according to claim 1, it is characterised in that the anchor head leads to Cross screw thread and coordinate the upper port for closing the body of rod, anchor head carries slurry outlet.