CN2673946Y

CN2673946Y - Gas combustion type prestressed rockbolt

Info

Publication number: CN2673946Y
Application number: CN 200420041489
Authority: CN
Inventors: 周曌; 陶纪南; 陈虹; 胡咏梅
Original assignee: No213 Research Institute Of China North Industries Group Corp
Current assignee: No213 Research Institute Of China North Industries Group Corp
Priority date: 2004-02-03
Filing date: 2004-02-03
Publication date: 2005-01-26
Anticipated expiration: 2014-02-03

Abstract

The utility model discloses a gas combustion type pre-stressed anchor shank for the working surface support of the underground large-sized engineering. The gas combustion type pre-stressed anchor shank is chiefly composed of a gas generator, an anchor shank body, an expansion shell and an inverted wedge; the gas generator contains a shell body, a work producing piston, gun powder or propellant powder, an igniter and a sealing ring; the work producing piston, the gun powder or the propellant powder and the igniter are arranged in the circular space of the shell body, and moreover, the gun powder or the propellant powder is hermetically isolated from the external environment via the sealing ring. While in the anchoring construction, the igniter is switched on, and the igniter is caused to fire the gun powder or the propellant powder; the gun powder or the propellant powder burns to generate large amounts of gas to propel the work producing piston to move; thereby the expansion shell is driven to move; the expansion shell is expanded in few seconds under the guide of the inverted wedge, and is wedged into an anchoring bore wall via the Z type teeth of the expansion shell. The notable advantages of the gas combustion type pre-stressed anchor shank are that the operation of the anchoring construction is extremely easy, and has the better cost-effectiveness ratio, and moreover, the gas combustion type pre-stressed anchor shank has reliable work, safe use and is suitable for the pre-stressed anchor shank about 10m.

Description

The combustion type prestressed anchor

Technical field

The utility model belongs to the scope of operation support technology field of major works arch country rocks such as tunnel, culvert, domatic crag, foundation ditch, relates in particular to a kind of prestressed anchor.

Technical background

For satisfy human in the farmland, the demand of aspect fast developments such as irrigation, water power, railway, highway, national defense safety and highrise building, people have excavated a large amount of tunnels, culvert.The span of these tunnels, culvert is from several meters to tens meters.Because the complexity of geologic structure, people are for guaranteeing the stable of excavation surface and continue safety of construction, and the excavation face must be reinforced earlier, reach certain safety standard after, just can carry out next step construction or come into operation." pin timbering " is present the most frequently used a kind of simple and effective reinforcement means, it is used for carrying out the reinforcing in mine tunnel at first, now be used for the supporting and the pre-supporting of culvert, tunnel surrounding more, and the domatic crag in the hydraulic engineering and protection of the pit foundation in the large-scale construction engineering and reinforcing.

Chinese patent ZL02229312.4 discloses the instantaneous self-locking prestressed anchor of a kind of middle long explosive expansion, it comprises anchor rod body, ring-shaped explosive powder stick, hangs one's head and the top tapered end, be connected with welding manner between anchor rod body top and the tup, the ring-shaped explosive powder stick places in the interior annular powder stick casing of the casing of hanging one's head, annular powder stick casing wraps in outside the anchor rod body, anchor rod body inserts anchor rod body in the inserting hole, and the top tapered end has six five equilibrium cone tanks, and the awl point stretches in the six five equilibrium parallel slots of tup.During construction, ignite the ring-shaped explosive powder stick, under the effect of the blast impulse power of this powder stick, hanging one's head moves down and embeds in the cone tank of top tapered end, the parallel slot of tup expands outwardly and locks with the anchor hole hole wall along cone tank simultaneously, and anchor pole is promptly by firm being locked in the anchor hole like this.The shortcoming of this anchor pole is: before (1) construction, must weld fixingly to the anchor rod body top in the inserting hole and tup to being installed in to hang one's head, operating procedure is complexity comparatively; What (2) the ring-shaped explosive powder stick used is explosive, exists certain potential safety hazard.

The utility model content

The technical problems to be solved in the utility model is, a kind of constructing operation but also combustion type prestressed anchor that can safe and reliable work not only be convenient to is provided, specifically, this anchor pole be by the gas driven piston open the one end bloated shell and with the rock bolt head wedging in anchor hole.

In order to solve the problems of the technologies described above, the utility model comprises gas generator, anchor bar body, fall wedge, shell expands.Described gas generator contains housing, acting piston, two sealing rings, gunpowder or propellant powder, igniter, hard hat, described housing is a cylindrical shell that has central through hole and looping pit, it is uncovered that looping pit one end has the end other end, and its bottom also has a through hole; Described acting piston is to have inside and outside ladder respectively on a circular cylinder and its inside and outside cylinder, on the inside and outside cylinder of the big annular solid of acting piston, be respectively equipped with inside and outside seal groove, the impulse stroke that the outer ladder of acting piston will be a bit larger tham the piston that does work apart from the distance of the little annular end face of acting piston; Described hard hat is a lid that has through hole, and the diameter of its through hole should be between the outside diameter of the little circular cylinder of acting piston and big circular cylinder; Described igniter, gunpowder or propellant powder, acting piston all are contained in the looping pit of described housing, draw in the through hole of the ignition lead of igniter by the looping pit bottom and with the space between fluid sealant shutoff through hole and the ignition lead, the big annular end face of acting piston contacts with propellant powder, two sealing rings are enclosed within respectively on the inside and outside seal groove of acting piston, and the opening end of hard hat and housing is connected; Described bloated shell is a cylinder that has conical through-hole, and its external surface has Z type tooth and longitudinally is provided with several pregroove marks; Described wedge is a cone that has centre bore; Described anchor bar body is a round bar that has step surface; Described gas generator, the shell that expands, the wedge that falls are enclosed within on the anchor bar body and by securing member in turn and fix, and the step surface of described housing bottom and anchor bar body is adjacent, and the described awl front end of wedge puts in the big opening end of the shell conical through-hole that expands, and its awl tail end is adjacent with securing member.

According to the utility model, have relief hole on the external cylindrical surface of described housing, described relief hole subtracts the impulse stroke of acting piston for the acting piston length apart from the distance of housing opening end.

The beneficial effects of the utility model are embodied in: first, only need finish before the anchoring construction gas generator, the shell that expands, the cover of wedge that falls are fixed this simple procedures on anchor bar body and with securing member, compare with welding sequence of the prior art, operation is very easy, and reduced construction cost; Second, the utility model is to drive the shell motion of expanding by a large amount of gases that common gunpowder or gun propellant combustion produce piston that promotes to do work, compare with the scheme of utilizing the blast powder stick generation impact force of igniting autocracy to carry out anchoring in the prior art, safety and versatility are good, efficiency-cost ratio is higher, and the acting driving force that gas generator of the present utility model produced can be up to 5t～10t, can reliably the shell that expands be wedged into the anchoring hole wall securely, its anchored force can reach more than the 20t, therefore, the utility model can be used as the prestressed anchor use about 10 meters; The 3rd, the ladder of hard hat and acting piston is used and offers relief hole on the housing of gas generator, makes the acting piston all can not break away from housing under any fortuitous event, thereby has further guaranteed safety of the present utility model.

Description of drawings

Fig. 1 is that the structure of the utility model gas generator is formed schematic diagram.

Fig. 2 is the bloated shell schematic diagram of the utility model.

Fig. 3 is the utility model schematic diagram of falling the wedge.

Fig. 4 is the utility model anchoring status figure.

The specific embodiment

Below in conjunction with accompanying drawing and preferred embodiment the utility model is described in further detail.

As shown in Figure 1, gas generator of the present utility model comprises housing 1, acting piston 2, two sealing rings 3, gunpowder or propellant powder 4, igniter 5, hard hat 8.Housing 1, acting piston 2 are made by ordinary metallic material, and the opening end of housing 1 is provided with external screw thread, and also having diameter on its external cylindrical surface is the relief hole 9 of φ 10mm.Igniter 5, gunpowder or propellant powder 4, acting piston 2 all are contained in the looping pit of housing 1, the medicament of gunpowder or propellant powder 4 should match with igniter 5 type selectings with dose, igniter 5 can be the igniter of common model, it also can be igniter head, the ignition lead 7 of igniter 5 passes the back by the bottom through hole of housing 1 and links to each other with external power supply, with conventional seals glue 6 space between through hole and the ignition lead 7 is sealed.Two sealing rings 3 are all made of elastomeric material, they are enclosed within respectively in the inside and outside seal groove of acting piston 2, fluid sealant 6 and inside and outside sealing ring 3 both can be sealed in gunpowder or propellant powder 4 in the space of housing 1 bottom, can prevent that again gunpowder or propellant powder 4 from making moist simultaneously.The function of hard hat 8 is to prevent behind the utility model accidental ignition that acting piston 2 flies out housing 1 and damages, and it is made by metal material and is connected with the external screw thread of housing 1.

Fig. 2, Fig. 3 show bloated shell 13 of the present utility model respectively and fall the structure of wedge 12.The external surface of wedge 12 is more smooth, and tapering is also less, so that it can easily be wedged under the driving of acting piston 2 in the internal taper hole of the shell 13 that expands.The internal taper hole surface of bloated shell 13 is also comparatively smooth, is convenient to down wedge 12 and enters; 3～6 pregroove marks of its vertical operated by rotary motion also can be many if establish less according to practical situations, and pregroove marks is exactly the weak link that struts the shell 13 that expands.

Fig. 4 expresses the assembly relation of the utility model before anchoring construction.As shown in Figure 4, first packing ring 15, gas generator, shell 13 expands, fall wedge 12, second packing ring 11 is enclosed within on the anchor bar body 16 in turn, first packing ring 15 contacts with the step surface of anchor bar body, the housing bottom of gas generator and first packing ring next-door neighbour, the conelet hole end surface of bloated shell 13 contacts with the end face of acting piston 2, the awl front end of wedge 12 puts in the auger nose end mouth of the shell 13 that expands, its awl tail end contacts with second packing ring 11, on the relevant position of anchor bar body 16, be provided with screw thread, nut 14 is screwed in the screw position of anchor bar body 16, thus with gas generator, shell 13 expands, the wedge 12 that falls is fixed on the anchor bar body 16.

Using method of the present utility model and operating principle are as follows:

When anchoring construction, at first gas generator of the present utility model, the shell 13 that expands, the wedge 12 that falls are fixed on the anchor bar body 16 according to the assembly relation of Fig. 4, then anchor head of the present utility model is sent into bottom the anchor hole that is positioned at anchor foundation 17.Switch on to the utility model then, at this moment, igniter 5 of the present utility model is got angry, the flame of its output will be sealed in the gunpowder or the propellant powder 4 of annular space and light, the a large amount of acting gases that produced promote 2 motions of acting piston, the conelet hole end surface that acting piston 2 promotes bloated shell 13 travels forward shell 13 integral body that expand, the wedge 12 that falls extend in the internal taper hole of the shell 13 that expands gradually, falling under the guiding of wedge 12, the pregroove marks that the shell 13 that expands longitudinally is provided with is opened gradually, and the Z type tooth on the bloated shell 13 will be fixed in the hole wall of anchor hole after it opens, at this moment, acting piston 2 is finished working stroke, and the burning gases in the housing are by relief hole 9 pressure releases, 2 stop motions of acting piston.From the utility model Z type tooth wedging anchoring hole wall of shell 13 of expanding of lighting a fire to, whole process was no more than for 10 seconds.

Claims

1. combustion type prestressed anchor, comprise down wedge, the shell that expands, have the circular bar shape anchor bar body of step surface, it is characterized in that: it also has a gas generator, described gas generator comprises housing [1], acting piston [2], two sealing rings [3], gunpowder or propellant powder [4], igniter [5], hard hat [8], described housing [1] is a cylindrical shell that has central through hole and looping pit, it is uncovered that looping pit one end has the end other end, and its bottom also has a through hole; Described acting piston [2] is to have inside and outside ladder respectively on a circular cylinder and its inside and outside cylinder, on the inside and outside cylinder of the big annular solid of acting piston [2], be respectively equipped with inside and outside seal groove, the impulse stroke that described outer ladder will be a bit larger tham acting piston [2] apart from the distance of the little annular end face of acting piston [2]; Described hard hat [8] is a lid that has through hole, and the diameter of its through hole should be between the outside diameter of the little circular cylinder of acting piston [2] and big circular cylinder; Described igniter [5], gunpowder or propellant powder [4], acting piston [2] all are contained in the looping pit of described housing [1], draw in the through hole of ignition lead [7] by the looping pit bottom of igniter [5] and with the space between fluid sealant [6] shutoff through hole and the ignition lead [7], the big annular end face of acting piston [2] contacts with gunpowder or propellant powder [4], two sealing rings [3] are enclosed within respectively on the inside and outside seal groove of acting piston [2], and hard hat [8] is connected with the opening end of housing [1]; Described bloated shell [13] is a cylinder that has conical through-hole, and its external surface has Z type tooth and longitudinally is provided with several pregroove marks; Described wedge [12] is a cone that has centre bore; Described gas generator, the shell [13] that expands, the wedge [12] that falls are enclosed within anchor bar body [16] in turn and go up and fix by securing member [14], the step surface of described housing [1] bottom and anchor bar body [16] is adjacent, the described awl front end of wedge [12] puts in the big opening end of bloated shell [13] conical through-hole, and its awl tail end is adjacent with securing member [14].

2. combustion type prestressed anchor according to claim 1, it is characterized in that: have relief hole [9] on the external cylindrical surface of described housing [1], described relief hole [9] subtracts the impulse stroke of acting piston [2] for acting piston [2] length apart from the distance of housing [1] opening end.