KR100783139B1 - Lock bolt apparatus - Google Patents

Abstract

The present invention relates to a prior load-loaded lock bolt device, the object of which is to pull the cone-shaped body mounted on the end of the tension member is pulled to the tension member while being firmly fixed to the inner circumferential surface of the perforation hole by expanding the expansion tank to the outside, ie radially By applying the grouting material to the rock prior to injecting the grouting material can be applied to the rock first using the expansion tank and the tensioning material, which can not only strengthen the unstable support for the rock, but also to separate grouting work Omit and continue to perform additional drilling work or additional excavation work immediately without curing period of injected grouting material, which can shorten the construction period and also restrain the ground by installing a packer at the entrance of the drilling hole during the preloading stage. Pressure grouting is performed in the After the expansion, the hollow hollow pipe exhibits a lock bolt function to maximize the reinforcement effect of the ground.

In order to achieve the above object, the preceding load-loaded lock bolt device according to the present invention includes a release hollow pipe (10); The extension tub 20 is installed to extend radially at one end of the release hollow pipe 10 and the tension member 21 and the cone-shaped inner surface 22 are formed in the center line direction so as to have an equal angle and are divided into three or more. ; A tension member 30 installed through the release hollow pipe 10 and the expansion tank 20; Cone-shaped body 40 is fastened and fixed to the end of the tension member 30 is inserted into the cone-shaped inner surface 22 of the expansion tank 20; A pressure plate 50 supporting the other end of the release hollow pipe 10 and having a tension hole 52 through which the tension material 30 penetrates; It is installed at the end of the tensile member 30 drawn out through the release hollow pipe 10 and the pressure plate 50, characterized in that it is provided with a fixing device 60 for maintaining the tension member 30 in a tensioned state do.

Lock bolt, tension member, hollow hollow pipe, expansion tank, cone body, anchorage

Description

Lock bolt apparatus

1 is a schematic view showing a lock bolt device according to the present invention;

Figure 2a is an exploded perspective view showing a buried fixing portion in the drilling hole in the lock bolt device according to the present invention,

FIG. 2B is a cross sectional view of FIG. 2A;

2C is a cross-sectional view taken along the line A-A of FIG. 2B;

Figure 3 is an exploded perspective view showing the outer mounting portion of the drill hole inlet in the lock bolt device according to the invention,

Figure 4a to 4d is a process diagram showing the process of construction using the lock bolt device according to the present invention,

Figure 5 is a cross-sectional view showing another embodiment of the outer mounting portion of the drill hole inlet in the lock bolt device according to the present invention.

<Description of the symbols for the main parts of the drawings>

10: release hollow pipe 20: expansion tank 21,62a: tension material

22, 62b: Cone inner surface 23: Expansion tank fixing ring 24: Flange

24a: guide groove 26: guide pin 28: flange cap

30: tension member 40: cone-shaped body 41: fastener

50: acupressure plate 54,72: grout inlet 60: anchorage

62: fixed body 64: wedge 68: cap

70: packer

The present invention relates to a lock bolt device used for a rock having a discontinuous surface, and more particularly, because the outer surface is extended in a radial radial cylindrical shape of the same diameter is fixed over a wider area on the inner surface of the drilling hole excellent fixing force It is improved, and since the safety of the slope is strengthened by the restraint effect on the discontinuous surface of the rock, it is possible to further excavation work immediately without the curing period of the grouting material is related to the lock bolt device that can shorten the construction period.

In general, the lock bolt is a method of drilling a rock to a rock, such as underground structures, tunnels, etc. with a predetermined diameter, and locks the lock bolt into the drilling hole. Such a lock bolt drills a hole in the ground including mountain rock in civil construction work, especially in tunnel work. The explosives, such as dynamite, for example, explode in the perforated holes to break the rock and widen the base hole, and then drill the foundation tunnel at a certain height and width, and then disintegrate the foundation tunnel. In order to prevent the ingot, a number of rock bolts (base bolts) are put on the inner side of the foundation tunnel, a grid mesh is installed, and concrete is finally poured to perform reinforcement film construction.

The reinforcement film construction, first drilled the hole for the rock bolt to be inserted into the rock by using a rock drill or crusher, and then cast cement mortar as a grouting material in the drilled hole and insert the lock bolt or insert the rock bolt In the case of pouring the cement mortar, the lock bolt is firmly fixed in the rock. In this case, the lock bolt is installed at predetermined intervals so that the lock bolt is sufficiently endured while maintaining the fixed load.

However, in such conventional lock bolts, cement mortar is placed in the drilled hole and waited until the cement mortar is cured, and then the lock bolt is firmly fastened to the pressure plate. After checking whether it can be supported through the drawing test and installing various materials or structures, it takes a long period of construction and has a problem of installing a plurality of lock bolts to improve bearing capacity.

Ground reinforcement methods using a rock bolt or a device to reinforce using such a lock bolt is continuously being developed, for example, 'locking rock assembly for a rock bed rock' is presented in Korean Patent No. 108419.

As can be seen by the claims, the tunnel rock layer is composed of a bolt body having a tapered first wedge member at the front end and a rear end spiral portion at which the nut is fastened to the rear end, and an expandable bushing expandable by the wedge member. In the fixing lock bolt assembly, an extension bushing inserted close to the first wedge member of the bolt body is formed in a tubular shape, and a plurality of toothed rings of helical inclined in one direction are formed on the outer surface of both ends and cut in the longitudinal direction to obtain several It has a toothed tube composed of an extension piece, and a tapered wedge connecting surface is formed on both sides thereof, and a tapered second wedge member is inserted into the rear side of the expansion bushing inserted into the bolt body and opposed to the first wedge member. And it is characterized in that the drive tube for driving the second wedge member forward driving to the expansion bushing side.

In the patent of the above configuration, the first wedge member is integrally formed in the bolt body, and it is difficult to manufacture, and even if separately provided, the manufacturing process such as the screw fastening method or the need to integrate by welding is complicated and cumbersome. there was.

In particular, the first wedge member at the end of the bolt body and the second wedge member pushed by the drive tube expand the extension piece in the radial direction of the outer part, but the extension piece which is a plurality of pieces cut radially in both sides of the expansion bushing is integrally provided. Therefore, the end is extended like a cone (cone), and because of this, the inner peripheral surface of the drilling hole and the entire extension piece does not come in contact with the surface, so that the fixing force is somewhat weak, there is a problem in that the tension is applied to the bolt fuselage.

The present invention has been devised to solve the problems of the conventional rock bolting method that is constructed during tunnel excavation or rock construction, and divided into an extension tank extending when the cone-shaped body attached to the tension member is pulled, each of which is radial Rock bolts that can be extended while moving to extend the contact hole with the drilled hole when it is expanded, thus providing an excellent fixing force, thereby enhancing safety, thereby allowing additional excavation work immediately without curing period of grouting material. The object is to provide a device.
Another object of the present invention is to have an expansion tank fixing ring for fastening the divided expansion tank, it is possible to restrain the expansion tank in normal, and to be inserted into the drilling hole by cutting the fixing ring by the expansion external force of the expansion tank. To provide a lock bolt that does not need to be removed.

Another object of the present invention is to provide a lock bolt device having a packer that blocks the inlet of the drilled hole, and forming two holes in the packer to inject grouting while extracting air, foreign matter, etc. in the drilled hole. have.

The present invention for achieving the above object is a heterogeneous hollow pipe formed with irregularities on the outer surface, divided into two or more so as to have an equal angle and is installed so as to move radially at one end of the hetero hollow pipe close to the inner surface of the drilling hole An extension tank formed with a tension member hole and a cone-shaped inner surface respectively in the center line direction, a tension member penetrating the release-hole hollow pipe from the other end of the release hollow pipe, and inserted into the cone-shaped inner surface; In this state, the cone-shaped body fastened to one end of the tension member, a pressure plate provided on the other end of the release hollow pipe and positioned in the outer side of the drilling hole and the other end of the tension member penetrates through the tension member hole of the pressure plate. Is installed on the other end of the drawn tension member Fixtures to hold the sheet in tension, fastening to an outer surface of the expansion vessel so as not to interfere with this operation when inserted into a drilling hole, such as a band or wire that can be cut when the expansion vessel is expanded A ringer and a packer provided to close the inlet of the punching hole between the other end of the release hollow pipe and the pressure plate, wherein the pressure plate and the packer are each formed with two grout injection holes that coincide with each other. The other one is characterized in that the grouting material is injected into the drilling hole while removing the air or foreign matter.

In order to guide the radial movement of the expansion tank, the release hollow pipe is fixed with a flange having a radial guide groove having a conformal angle corresponding to the number of divisions of the expansion tank at one end thereof, and a guide pin penetrates the guide groove of the flange. Expansion tanks may be respectively fastened to be movable radially.

The flange may be covered with a flange cap to prevent foreign matter from penetrating the guide groove, the guide pin.

The anchorage is fastened to the fixed body so as to cover the other end of the wedge and the tension member is inserted into the fixed body formed with the tension member hole and the cone-shaped inner surface, the cone-shaped inner surface of the fixed body to fix the tension member; Can be configured as a cap.

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According to the present invention having the above-described features, the cone-shaped body mounted at the end of the tension member is pulled out to expand the expansion tank to the outside thereof, that is, the outer surface is extended to the radially radial shape of the same diameter over a wider area on the inner surface of the drilling hole. Fixed force improves more prominently, and if the preceding load is applied, the safety of the slope is strengthened by the restraint effect on the discontinuous surface of the rock, so additional excavation work can be performed immediately without curing period of grouting material, which can shorten the construction period. As well as reducing construction costs, work efficiency is improved.

Hereinafter, the configuration and operation of the lock bolt device according to the present invention will be described in more detail based on the accompanying drawings.

1 is a configuration diagram schematically showing a lock bolt device according to the present invention, Figures 2a to 2c is a view showing a buried fixing part in the drilling hole in the lock bolt device according to the present invention, Figure 3 is a lock according to the present invention An exploded perspective view showing the external mounting portion of the inlet hole in the bolting device.

As shown in the figure, the lock bolt device according to the present invention is provided with an elongated hollow hollow pipe 10 having irregularities formed on the outer surface in order to improve the adhesion with the grouting material, one end of the hollow hollow pipe 10 The expansion tank 20 is radially expanded while being guided through the flange 24 is installed, the extension tank 20 is formed with a tension hole 21 and the cone-shaped inner surface 22 in the center line direction, and the outer periphery Is formed to be constant and divided into three with equal angles.

The release hollow pipe 10 and the expansion tank 20 at one end thereof is provided with a tension member 30 penetrating through the inside thereof, and the cone-shaped inner surface 22 of the expansion tank 20 at the end of the tension member 30. Cone-shaped body 40 to be inserted into the installation is fastened and fixed, the cone-shaped body 40 is inserted into the wedge 42 divided into three into the cone-shaped body 40 to be located outside the tension member 30 and The wedge 42 is fixed by a fastener 41 which is screwed with the cone-shaped body 40.

The expansion tank 20 has been shown to expand three fan-shaped shape centering on the tension member hole 21 into which the tension member 30 is introduced, that is, a configuration that extends outward when tensioning the tension member 30, The number is not limited because it may be composed of three or more expansion tanks.

In the flange 24, the guide groove 24a is radially formed at an equal angle to the number of divisions of the expansion tank 20 so as to smoothly expand the expansion tank 20, and the guide groove of the flange 24 The guide pins 26 are fastened so that each of the expansion tanks 20 can move radially through the 24a, and foreign matter does not penetrate the guide pins 26 and the guide grooves 24a to the flange 24. The flange cap 28 is covered. When the flange cap 28 is covered with the flange 24 in this way, even when cement mortar, which is a grouting material, is injected into the drilling hole h, the expansion tank 20 is not disturbed at all, and the locking hole h is locked. When charging the expansion tank 20 of the bolt device, it can be easily loaded without being disturbed.

On the outer surface of the expansion tank 20 is a band that can be cut by a predetermined expansion external force in the expansion tank 20 without disturbing the operation when carrying the bolt device into the drilling hole (h), such as a rock It should be fastened with an expansion tank fixing ring 23, such as a wire.

The other end of the release hollow pipe 10 is provided with a pressure plate 50 having a tension hole 52 through which the tension member 30 penetrates, and passes through the release hollow pipe 10 and the pressure plate 50. At the end of the drawn tension member 30, a fixing unit 60 is provided for maintaining the tension member 30 in a tensioned state.

The fixing unit 60 is provided with a fixing body 62 having a tension member hole 62a and a cone-shaped inner surface 62b, and penetrated through the tension member hole 62a to the cone-shaped inner surface 62b of the fixing body 62. Three wedges 64 are inserted to fix the tension member 30, and the cap body 68 covers the end of the tension member 30 so that the wedge 64 is not detached from the fixing body 62. Is fastened. In addition, between the fixed body 62 and the cap 68 is provided with a mesh hook 66 for hanging and fixing the net is covered on the incision surface.

It will be described the construction process using the lock bolt device according to the present invention configured as described above. First, a hole (h) in which the rock bolt device of the present invention can be inserted into a discontinuous rock surface at the time of tunnel excavation or rock work is drilled as shown in FIG. 4A, and then as shown in FIG. 4B in the hole (H). After inserting the lock bolt device, the end portion of the tension member 30 protruding from the outside of the drilling hole h is the tension member hole 52a of the pressure plate 50 and the tension member hole 62a of the fixed body 62; By pulling the tension member 30 to penetrate the inside of the wedge 64 inserted into the cone-shaped inner surface 62b, the wedge 64 is pushed and fixed to maintain the tension force in the tension member 30 as shown in FIG. 4C.

At this time, when the tension member 30 is pulled, the expansion tank 20 of the end of the release hollow pipe 10 is extended while moving radially by the cone-shaped body 40 at the end of the tension member 30, thereby expanding the inner surface of the hole H. Since the tension is applied to the tension member 30 after being fixed to the tension force, and the tension force is maintained, so that another excavation operation can be performed even before the grouting material is injected and cured.

In this way, pulling tension member 30 to give tensile force without injecting grouting material into the drilling hole h is also referred to as a preloading load. When a load is applied to a rock on which discontinuous cracks are formed, a load on the rock surface is supported. Will be.

The lock bolt device of the present invention will be described in more detail the process of loading the preceding load, the pulley 41 and the cone-shaped body 40 coupled to the end of the tension member 30 is naturally expanded as the tension member 30 is pulled The expansion tank 20 extends toward the outside, that is, toward the inner surface of the drilled hole h while being drawn toward the cone-shaped inner surface 22 formed inside the tank 20, and the expansion tank 20 When is expanded, the entire outer circumferential surface of the expansion tank 20 is in contact with the inner surface of the drilling hole (h), thereafter the drilling hole (h) in the process of tensioning the tension member 30 as the expansion tank 20 is further extended The expansion tank 20 is firmly fixed to the inner surface of the drilling hole (h) while being dug into the inner surface of the hole.

As the expansion tank 20 is fixed to the inner surface of the drilling hole (h) as described above, the load applied to the rock of the discontinuous surface before the injection of the grouting material is applied to the tension member 30 by applying a tensile force to the rock surface by loading the preceding load This is to support the load, and thus the grouting selectively injected into the drilling hole (h) is able to proceed with another excavation even if it is not firmly solidified.

The tension member 30 is gripped as shown in FIG. 4C through the wedge 64 inserted into the cone-shaped inner surface 62b of the fixing body 62 forming the anchorage 60 at the inlet side of the drilling hole h as above. In Figure 4d as shown in the fixing body 62, the mandrel hook 66 is inserted and the cap 68 is fastened to finish. As such, after the mandrel 66 and the cap 68 are assembled to the fixed body 62, the wedges 64 of the fixed body 62 are not separated and detached from the mandrel 66. It is possible to get the net to be covered.

5 is a view showing another embodiment of a portion mounted to the inlet of the drilling hole in the lock bolt device according to the present invention. Here, a packer 70 is provided between the end of the release hollow pipe 10 and the pressure plate 50 to support the end of the release hollow pipe 10 to block the inlet of the hole. The packer 70 and the pressure plate 50 are provided. ), Two grout inlets 54, 72 are formed to inject the grouting material into the drilling holes and remove foreign substances.

According to the configuration of another embodiment configured as described above, since the inlet portion of the drilling hole (h) is closely closed, the tension member (20) is fixed to the inner surface of the drilling hole (h) by the method as described above. 30) after applying the tensile force to the load, and then injecting the grout injecting cement mortar through the grout inlet (54, 72) of the packer 70 and the pressure plate 50, the grout inlet Furnace can be pressure grouting while removing the air or foreign matter in the hole (h). At this time, the curing is made in a state where the cement mortar is reliably penetrated between the rock of the discontinuous surface.

Thus, after the cement mortar, which is a grouting material, is cured, cement mortar penetrates and cures between the rocks of the discontinuous surface, thereby further strengthening the strength of the rock.

In addition to showing and explaining the lock bolt device of the present invention, various modifications are possible, so that the embodiments to be modified should be interpreted as being included in the scope of the present invention without departing from the scope of the present invention.

In the present invention as described above, since the entire outer surface of the expansion tank is expanded in the same way, the inner surface of the drilled hole is contacted (fixed) over a larger area so that the fixing force is excellent, and when the preceding load is loaded on the tension member, the rock restrains the discontinuous surface. The effect is that the safety of the slope is strengthened and additional excavation work is possible immediately without the curing period of the grouting material has the advantage that the construction period can be shortened. In addition, the expansion tank fixing ring can be fastened and restrained by two or more expansion tanks. In addition, the expansion tank fixing ring is cut when the expansion tank is expanded, and thus operations such as transportation and insertion into the drilling holes are performed. This has the advantage of being convenient.

In addition, if the packer is installed at the inlet of the hole in the loading stage of the preceding load, if the pressure grouting is performed while the ground is constrained, the hollow hollow pipe performs the function of the lock bolt after grouting, so the ground reinforcing effect can be maximized. have.

Claims (5)

Deformed hollow pipe 10 having irregularities on the outer surface, the outer circumference is constant, the tension hole 21 and the cone-shaped inner surface 22 is formed in each of the center line direction and divided into two or more so as to have an equal angle and the hollow hollow pipe ( Expansion tank 20, which is installed so as to move radially at one end of the expansion end (10) in close contact with the inner surface of the drilling hole (h), from the other end of the release hollow pipe (10) the release hollow pipe (10) The tension member 30 penetrated through the tension member hole 21 in a state of penetrating through the tension member 21 and inserted into the cone-shaped inner surface 22. In this state, the tension member 30 is fastened to one end of the tension member 30. As the tension is drawn into the cone-shaped inner surface 22, the cone-shaped body 40 for moving the evenly divided expansion tank 20 radially and simultaneously, the other end of the release hollow pipe 10 is provided with a drill hole ( h) outside on the outside And a pressure plate 50 having a tension hole 52 through which the other end of the tension member 30 penetrates, and installed at the other end of the tension member 30 drawn out through the tension hole 52 of the pressure plate 50. And the fixing unit 60 which keeps the tension member 30 in the tensioned state, and the coil is wound on the outer surface of the expansion tub 20 so as not to disturb the operation when inserted into the hole or the drilling hole h. Expansion tank fixing ring 23, such as a band or wire, which can be cut when the tub 20 is expanded, and the other end of the release hollow pipe 10 and the pressure plate 50 of the drilling hole (h) It consists of a packer 70 provided to close the inlet, The acupressure plate 50 and the packer 70 each have two grout injection holes 54 and 72 coincident with each other, one of which removes air or foreign matter from the hole H, and the other hole of the hole H. Lock bolt device characterized in that the grouting material is injected into the). The method according to claim 1, The release hollow pipe 10 is a flange having a radial guide groove 24a having a conformal angle corresponding to the number of divisions of the expansion tub 20 at one end thereof to guide the radial movement of the expansion tub 20 ( 24 is fixed and guide pins 26 penetrate through the guide grooves 24a of the flanges 24, respectively, so that the extension tubs 20 are radially movable. The flange 24 is a lock bolt device, characterized in that the flange cap (28) is covered so as to prevent foreign matter from penetrating the guide groove (24a), the guide pin (26). The method according to claim 1 or 2, The fixing unit 60 is inserted into the fixing body 62 and the cone-shaped inner surface 62b of each of the fixing body 62 and the cone-shaped inner surface 62b, respectively, to fix the tension member 30. And at least one wedge (64) and a cap (68) fastened to the stationary body (62) to cover the other end of the wedge (64) and the tension member (30). delete delete

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