CN2423318Y

CN2423318Y - Explosion expanded rockbolt

Info

Publication number: CN2423318Y
Application number: CN00212069U
Authority: CN
Inventors: 王述红; 王韶群; 孙豁然
Original assignee: Northeastern University China
Current assignee: Northeastern University China
Priority date: 2000-06-01
Filing date: 2000-06-01
Publication date: 2001-03-14
Anticipated expiration: 2010-06-01

Abstract

The utility model relates to an anchor rod, which belongs to an explosion expanded anchor rod used for the field of civil construction. Steel strands are used for a rod body, and a purpose-made steel sleeve is used for an inner anchor head. The steel sleeve is provided with six grooves. When a project is constructed, firstly, a grouting pipe and the steel sleeve are in good connection, the steel strands are penetrated into the grouting pipe, and one section of steel strand is extends out from the steel sleeve. The extended steel strands are unwound and straightened, and explosives and a detonator are formed into a cylinder which is appropriate to the internal diameter of the steel sleeve by utilizing the extended steel strands. The steel strands are pulled to a negative direction, the cylinder gets into the proper position of the steel sleeve, and a nozzle of the steel sleeve is sealed. A fusiform expanding head is formed at an anchor end after the utility model is exploded and expanded. The structure of the explosion expanded anchor rod provided by the utility model is simple, the anchorage force of the explosion expanded anchor rod is increased above two times as compared with common anchor rods. The utility model is suitable for earth bodies and soft rock stratums.

Description

A kind of Explosion expanded rockbolt

The utility model anchor pole belongs to the civil construction field, and particularly a kind of large-scale slope retaining, deep foundation ditch are reinforced the equipment of usefulness.

At present, the anchor pole that be applicable to different geological conditionss, has difference in functionality and a purposes has hundreds of, and the monomer anchor pole generally is made up of anchor head, the body of rod and backing plate.The most common and the most basic anchor pole has resin anchor, cement mortar anchor pole, pipe-seam type anchor rod etc.Resin anchor: anchoring agent cost height, storage period is short; The cement mortar anchor pole: water/binder ratio is vulnerable to the influence of underground water or rock fracture water and is difficult to ensure the quality of products; Pipe-seam type anchor rod: cost is higher, and anchored force easily changes and the length of service is restricted, and the scope of application is mainly in rock mass.For large-scale slope retaining, when the deep foundation ditch stabilization works needs the large-tonnage anchor pole, these kinds anchor pole all is difficult to engineering demands.

At the deficiencies in the prior art part, the utility model provides a kind of raising anchor-holding force of anchor bolt, particularly a kind of novel Explosion expanded rockbolt of anchored force between the anchor pole and the soil body.

The body of rod of the Explosion expanded rockbolt that the utility model relates to adopts steel hinge line, and interior anchor head adopts special steel sleeve.Open six road grooves of suitable length along its length equably in the end of steel sleeve, the degree of depth of groove is less than the wall thickness of steel sleeve.During construction, earlier Grouting Pipe and steel sleeve are connected, steel hinge line is penetrated steel sleeve by Grouting Pipe, and from steel sleeve, stretch out one section, the steel hinge line that will stretch out unties, stretching, with it with explosive and detonator surrounds and steel sleeve internal diameter size is suitable cylinder, the anti-steel hinge line that draws, make this cylinder enter correct position in the steel sleeve, and seal the steel sleeve mouth of pipe.Grouting Pipe and steel sleeve are packed in the bolthole, seal outer anchor head mouth simultaneously.Ignition charge forms a fusiform cavity at the steel sleeve place, and surrounding soil is being supported by six sleeve pipe steel discs.Then, slip casting is extracted Grouting Pipe till designing requirement place in bolthole.

The Explosion expanded rockbolt that the utility model provides is simple in structure, and anchored force improves more than 100% than common bolt.

Fig. 1 is special steel sleeve structural representation before the explosive expansion,

Fig. 2 is the A-A sectional view of Fig. 1,

Fig. 3 is special steel sleeve structural representation after the explosive expansion.

Description of drawings: 1-steel sleeve; 2-sleeve pipe steel disc; The cavity that forms after the 3-explosive expansion; The 4-groove; The 5-steel hinge line; The 6-explosive; The 7-detonator.

Below in conjunction with drawings and Examples the utility model is described further.

Embodiment: the steel hinge line 5 that the body of rod of Explosion expanded rockbolt adopts is the six roots of sensation altogether, every seven strands.Special steel sleeve 1 as shown in Figure 1, 2, it is 37mm that steel sleeve 1 adopts external diameter, internal diameter is 30mm, wall thickness is the steel pipe of 3.5mm, long 1.5m.Open six road grooves 4 on steel sleeve 1 along its length equably, groove 4 is 2.5mm deeply, long 1m.Grouting Pipe and steel sleeve 1 are connected, steel hinge line 5 is penetrated Grouting Pipe, and stretch out one meter long from steel sleeve 1, the steel hinge line 5 that will stretch out unties, stretching.To calculate good explosive 6 with 42 strands of steel hinge lines 5 and surround a cylinder, its diameter does not surpass the internal diameter of steel sleeve 1, the simultaneously pre-buried good electric cap of igniting 7.From the anti-steel hinge line that draws of the other end, the one section steel hinge line that is wrapping explosive is drawn in the sleeve pipe, preferably explosive is contained in the middle part of slotted line, but does not exceed slotted line.The sectional view at the special steel sleeve A-A place at fluting place as shown in Figure 2.With timber wedge the mouth of pipe of anchoring section is sealed up, in order to avoid during skyhook, the soil body enters in the pipe.With Grouting Pipe the ready body of rod and sleeve pipe are inserted into design attitude, the anchor pole aperture are sealed, in order to avoid explosion time has fragment or sandstone to fly out from the aperture with wet mud or mortar.Detonating primer, explosive is in the blast of the bottom of bolthole, and the rapid expansion of volume is exploded into fusiform enlarged footing with sleeve pipe, as shown in Figure 3.Six sleeve pipe steel discs 2 are supporting surrounding soil, form cavity 3, also with the soil body around compacted, strengthen the shear strength of the soil body simultaneously.42 strands of steel hinge lines 5 are distributed in the enlarged cavity 3 brokenly.Concrete perfusion mortar in the past immediately hole makes it form the anchoring section of band enlarged footing.The calculating of explosive charge is the key of Explosion expanded rockbolt design, is determined jointly by the compressibilty of soil, the material of steel pipe and the performance of explosive.

Claims

1, a kind of Explosion expanded rockbolt is made up of the body of rod, explosive, detonator, it is characterized in that this anchor pole also comprises steel sleeve, the body of rod adopts steel hinge line, penetrate steel sleeve by Grouting Pipe, steel hinge line stretches out steel sleeve in anchored end, opens six road grooves on steel sleeve along its length equably, and steel hinge line is penetrated steel sleeve, one end of fluting is towards the end of steel hinge line, blasting charge and detonator in steel sleeve.

2, a kind of Explosion expanded rockbolt as claimed in claim 1 is characterized in that saidly slotting on steel sleeve, and the degree of depth of groove is less than the wall thickness of steel sleeve.