CN214657001U - Double-bag expanding anchor rod - Google Patents

Abstract

The utility model relates to a two bag expansion stock. A double-bag expanding anchor rod comprises a bearing seat, an anchor rod body, an outer bag, an inner bag and a grouting pipe for grouting into the inner bag, a grouting channel for grouting from the inner bag to the outer bag is arranged between the inner bag and the outer bag, a grouting pipe check valve is arranged on the grouting pipe, a pressure control valve is arranged on the grouting channel and used for opening after cement slurry in the inner bag is filled, the pressure control valve has a certain damping effect on the cement slurry flowing into the outer bag from the inner bag to enable the pressure in the inner bag to be larger than that of the outer bag, the inner bag can be easily unfolded through the pressure in the inner bag, so that the inner bag can be fully unfolded, and then make the bottom of outer bag fully supported, the enlarged footing volume on the stock that obtains is great, and anchoring performance is higher, has solved the difficult technical problem that the stock anchoring performance is lower that expandes the cause of inner bag when present two bag expansion stock uses.

Description

Double-bag expanding anchor rod

Technical Field

The utility model relates to a two bag expansion stock.

Background

The anchor rod is used for anchoring a mountain, supporting a foundation pit, resisting floating of an underground building and the like, and when the anchor rod is applied to the underground building, the anti-floating capacity of the underground building can be improved, and the underground building is prevented from floating. The anchor rod body commonly used by the current anchor rod comprises a steel strand and a steel bar. Chinese patent with grant publication number CN203891039U discloses a double-bag type enlarged head carrier, which comprises a front carrier plate and a rear carrier plate, wherein a double-bag is arranged between the front carrier plate and the rear carrier plate, which are respectively an inner bag and an outer bag, the grouting hole of the grouting pipe is located inside the inner bag, the inner bag is further provided with an overflow hole, the grouting is performed to the inner bag through the grouting hole, and cement slurry in the inner bag overflows through the overflow hole and enters the outer bag. When the anchor rod is installed, sediment is easily reserved at the bottom of the anchor rod hole, and when the double-bag expanding anchor rod is used, the inner bag is firstly opened under the action of cement paste, so that the bottom of the outer bag can be supported, the shape of the outer bag is more regular, and the anchoring effect is better.

The overflow hole is formed in the inner bag of the double-bag body expansion anchor rod, the inner bag is possibly not fully unfolded due to the fact that the inner bag is obstructed by the outside, when cement paste overflows from the overflow hole of the inner bag, the size of the obtained expansion head on the anchor rod is still small, and the anchoring performance is low.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a two bag expansion stock for the inner bag is difficult to expand the lower technical problem of stock anchorage performance that causes when solving present two bag expansion stock and using.

The utility model discloses a two bag expansion stock adopts following technical scheme:

a dual-pocket expandable anchor comprising:

a load bearing structure;

the lower end of the anchor rod body is a bearing end arranged on the bearing structure;

the outer bag forms a sealed outer bag cavity inside and is fixed with the bearing structure;

the inner bag is positioned in the outer bag and fixed with the bearing structure, a sealed inner bag cavity is formed inside the inner bag, and the inner bag is close to the lower end of the outer bag and far away from the upper end of the outer bag;

the grouting pipe is used for grouting into the inner bag;

a grouting channel for grouting from the inner bag to the outer bag is arranged between the inner bag and the outer bag;

and a pressure control valve is arranged on the grouting channel and used for opening the grouting channel after the pressure of cement paste in the inner bag reaches a certain value, and water supply slurry enters the outer bag through the grouting channel.

Has the advantages that: the utility model discloses a be provided with the pressure control valve between inner bag and the outer bag of two-bag expansion anchor rod, the pressure control valve has certain pressurize effect to the grout of inner bag, it is comparatively easy to make the expansion of inner bag, and then make the inner bag can fully expand, and then make the resistance that the outer bag can overcome anchor rod hole bottom deposit fully strut, the enlarged footing volume on the stock that obtains is great, the anchor performance is higher, the lower technical problem of stock anchor performance that the inner bag is difficult to expand and cause when having solved present two-bag expansion anchor rod and using.

Furthermore, a grouting pipe check valve is arranged on the grouting pipe, and the opening pressure of the grouting pipe check valve is smaller than that of the pressure control valve. Further improving the pressure of the inner bag and ensuring that the inner bag is more fully unfolded.

Further, the pressure control valve is a check valve. Prevent the cement paste in the outer bag from flowing back to the inner bag.

Further, the bearing structure comprises a bearing seat, an inner bag seat and an outer bag seat, the anchor rod body penetrates through the inner bag seat and the outer bag seat, a bearing end of the anchor rod body is fixed with the bearing seat or matched with the bearing seat in a blocking mode from top to bottom, the inner bag seat is located in the outer bag, the upper end of the inner bag is fixed on the inner bag seat, the upper end of the outer bag seat is fixed on the outer bag seat, the lower end of the inner bag and the lower end of the outer bag are fixed with the bearing seat, the grouting pipe penetrates through the outer bag seat and then is fixed with the inner bag seat, and the grouting channel is arranged on the inner bag seat. The inner bag and the outer bag are convenient to mount through the bearing seat, the inner bag seat and the outer bag seat.

Further, the double-bag expanding anchor rod comprises a fixing pipe, the anchor rod body penetrates through the fixing pipe, the lower end of the fixing pipe is fixed with the bearing seat, the upper end of the fixing pipe is fixedly connected with the outer bag seat, and the inner bag seat is fixed with the fixing pipe. The outer bag seat and the inner bag seat are connected through the fixing pipe, so that the pre-installation of the anchor rod is facilitated, and the installation efficiency is improved.

Furthermore, a bag grouting pipe is arranged on the inner bag seat, a channel in the bag grouting pipe forms the grouting channel, and the pressure control valve is arranged on the bag grouting pipe. The installation of the pressure control valve is facilitated by the bag grouting pipe.

Furthermore, one end of the bag grouting pipe extends into the outer bag, and the pressure control valve is arranged on the part of the bag grouting pipe extending into the outer bag. The available space in the outer bag is larger, which is convenient for the installation of the pressure control valve.

Furthermore, a guide cap is fixed on the bearing structure, the bearing end of the anchor rod body extends into the guide cap, a protection cavity for protecting the bearing end of the anchor rod body is enclosed by the guide cap and the bearing structure, a grouting hole communicated with the protection cavity is formed in the bearing structure, and the grouting hole is communicated with the inner bag or the outer bag to allow cement paste in the inner bag or the outer bag to enter the protection cavity. Can prevent the stock body of rod to stretch into the tip corrosion in the direction cap after the slip casting in the protection intracavity.

Further, the grouting holes are at least two. During grouting, part of grouting holes are used for supplying water slurry, and part of grouting holes can be used for exhausting air, so that smooth grouting is facilitated.

Furthermore, the outer bag and/or the inner bag are/is fixed with a bearing structure through an anchor ear, the bearing structure is provided with an anchor ear matching ring groove, and the anchor ear is tightly hooped in the anchor ear matching ring groove; the bearing structure comprises a bag seat sleeve for fixing an outer bag and/or an inner bag, the bag seat sleeve is provided with an annular bulge formed by outward bulging after the wall of the bag seat sleeve is formed by rolling, and at least one side groove wall of the hoop matching groove is formed by the annular bulge. The annular bulge is simple in structure, and the hoop is matched with the annular groove to prevent the hoop from moving up and down.

Drawings

Fig. 1 is a schematic structural view of a double-bag expanded anchor rod of embodiment 1 of the present invention;

fig. 2 is a partial structural schematic view of a double-bag expanding anchor rod of embodiment 1 of the present invention;

FIG. 3 is an enlarged view of portion A of FIG. 1;

FIG. 4 is an enlarged view of portion B of FIG. 1;

in the figure: 1. an anchor rod body; 101. a carrying end; 102. stretching the end; 2. a fixed tube; 3. an inner pouch; 4. an outer pouch; 5. an outer bag seat; 6. a bearing seat; 601. grouting holes; 602. a carrier plate; 603. a load bearing seat cover; 7. an inner bag seat; 8. a grouting pipe; 9. a slip pipe check valve; 10. a pressure control valve; 11. a guide cap; 111. a protective cavity; 12. an anchor nut; 13. an exhaust valve; 14. hooping; 15. an outer bag base plate; 16. an outer bag seat cover; 17. an annular projection; 18. the hoop is matched with the ring groove; 19. an elastic sealing gasket; 20. a pouch grouting pipe; 21. and (6) plugging the nut.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention, i.e., the described embodiments are only some, but not all embodiments of the invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.

It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The terms "upper", "lower", "front", "rear", "left", "right", and the like indicate orientations or positional relationships that are assumed to be merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

The features and properties of the present invention are described in further detail below with reference to examples.

The utility model discloses specific embodiment 1 of two bag expanding stock:

the anchor rod in the embodiment can be suitable for temporary anchoring occasions, such as foundation pit supporting, and can also be suitable for permanent anchoring occasions, such as mountain anchoring, anti-floating anchoring of underground buildings and the like.

As shown in fig. 1 and 2, the double-bag expanding anchor comprises an anchor rod body 1, a bearing structure, an inner bag 3 and an outer bag 4.

The bearing structure comprises a fixed tube 2, an outer bag seat 5, a bearing seat 6 and an inner bag seat 7, wherein the lower end of the fixed tube 2 is fixed with the bearing seat 6, the upper end of the fixed tube 2 is fixed with the outer bag seat 5, the middle part of the fixed tube is fixed with the inner bag seat 7, and the inner bag seat 7 is positioned in the outer bag 4. The fixing tube 2 is used for the anchor rod body to pass through. In this embodiment, the number of the fixing pipes is one, and in other embodiments, the number of the fixing pipes may be two or more, and the two or more anchor rod bodies are in one-to-one correspondence with the fixing pipes. The anchor rod body may be a steel bar or a steel cable.

The upper and lower both ends of outer bag 4 are fixed respectively on outer bag seat 5 and bear seat 6, and interior bag 3 is close to the lower extreme of fixed pipe 2 and keeps away from the upper end of fixed pipe 2, and interior bag 3 is in outer bag 4, and interior bag 3 is close to 4 lower extremes of outer bag and keeps away from the setting of 4 upper ends of outer bag.

The upper end and the lower end of the inner bag 3 are respectively fixed on the inner bag seat 7 and the bearing seat 6, and the inner bag 3 is sleeved outside the fixed tube 2 and fixed inside the outer bag 4. During grouting, firstly, grouting is carried out on the inner bag 3, then cement slurry overflowing from the inner bag 3 enters the outer bag 4 to fill the outer bag 4, and the concrete structure is as follows:

as shown in fig. 1, a grouting pipe 8 communicated with a grouting device penetrates through an outer bag seat 5 and an inner bag seat 7 and then extends into the inner bag 3, a grouting pipe check valve 9 is arranged on a part of the grouting pipe 8 extending into the inner bag 3, the grouting pipe check valve 9 has a set opening pressure, the opening pressure is preferably 0.5-2.5Mpa, and grouting is performed on the inner bag 3 after the grouting pressure reaches the opening pressure of the grouting pipe check valve 9. In other embodiments, the grouting pipe may not extend into the inner bag, for example, a through hole is provided on the inner bag seat, the grouting pipe is directly welded at the orifice of the through hole, and the grouting pipe check valve may be disposed outside the inner bag.

Be fixed with bag slip casting pipe 20 on inner bag seat 7, bag slip casting pipe 20 one end stretches into outer bag 4, the other end stretches into inner bag 3, the inside passage of bag slip casting pipe 20 forms the slip casting passageway, can outwards bag 4 slip casting through the slip casting passageway, bag slip casting pipe 20 stretches into and is provided with pressure control valve 10 on the part of outer bag 4, pressure control valve 10 is used for opening the slip casting passageway after the cement paste pressure reaches a definite value in inner bag 3, the water supply mud passes through the slip casting passageway and gets into outer bag 4. Pressure control valve 10 is one-way check valve in this embodiment, and pressure control valve 10 is including setting up the valve opening and the cover at valve opening department with the slip casting passageway intercommunication on bag slip casting pipe 20, and after the cement paste pressure exceedes a definite value in the inner bag, the elasticity cover warp under the cement paste pressure and opens the slip casting passageway. In other embodiments, the pressure control valve may also be a ball valve.

In this embodiment, in order to further make the grouting in the inner bag 3 more sufficient, the opening pressure of the pressure control valve 10 is greater than the opening pressure of the grouting pipe check valve 9, and the opening pressure of the pressure control valve 10 is preferably 1 to 3 Mpa. By increasing the opening pressure of the pressure control valve 10, the cement paste in the inner bag 3 can more fully open the inner bag 3.

The present embodiment in which the pouch injection tube 20 is provided on the top of the inner pouch 3 can prevent the pouch injection tube 20 from being clogged.

As shown in fig. 1 and 3, the outer bag holder in this embodiment includes an outer bag holder plate 15 and an outer bag holder 16 fixed to one side of the outer bag holder plate 15. As shown in fig. 1, the outer bag seat cover 16 is fixed to the lower side of the outer bag seat plate 15.

As shown in fig. 4, the carrier seat 6 includes a carrier plate 602 and a carrier seat 603, the carrier seat 603 is fixed on the upper side of the carrier plate 602, and the inner bag seat 7 includes an inner bag seat plate and an inner bag seat cover, the inner bag seat cover is fixed on the lower side of the inner bag seat plate.

In this embodiment, the ends of the inner bag 3 and the outer bag 4 are fixed by the anchor ear 14. The engagement structure of the hoop 14 with the carrying seat, the inner bag seat and the outer bag seat is the same, and the outer bag seat will be described as an example.

The annular bulge 17 is formed to the evagination after the mantle wall roll forming of outer bag seat cover 16, the external diameter of outer bag seat board 15 is greater than the external diameter of outer bag seat cover 16, the outer fringe of outer bag seat board 15 forms staple bolt cooperation annular 18 with annular bulge 17, a lateral wall of staple bolt cooperation annular 18 is formed by annular bulge 17, staple bolt 14 cramps at staple bolt cooperation annular 18, prevent staple bolt 14 drunkenness from top to bottom, improve the stability of inner bag 3 and outer bag 4. An elastic sealing gasket 19 is arranged in the hoop matching ring groove 18, and the elastic sealing gasket 19 is arranged between the outer bag seat and the outer bag to improve the sealing performance.

Because the bearing seat 6 needs to fix the inner bag 3 and the outer bag 4, the bearing seat 6 is provided with two hoop matching ring grooves 18, and the two hoop matching ring grooves 18 are formed by a bearing seat sleeve, two annular bulges 17 which are arranged on the bearing seat sleeve and are formed by rolling and forming the sleeve wall of the bearing seat sleeve and then protruding outwards, and the edge of the bearing plate 602. The bearing seat cover, the inner bag seat cover and the outer bag seat cover in the embodiment are all bag seat covers used for fixing the bag.

In this embodiment, the bearing seat 6 is fixed with a guide cap 11, and the lower end of the guide cap 11 is a tapered tip. One end of the anchor rod body 1 is a bearing end 101 which is in stop fit with the bearing seat 6 in the axial direction, and the other end is a stretching end 102 for the jack to apply force to tension the anchor rod body. Bear end 101 and stretch into in the direction cap 11 after passing fixed pipe 2, bear end 101 and be provided with anchor nut 12, because bear end 101 be provided with anchor nut screw-thread fit's external screw thread, in order to avoid anchor nut 12 and bear end 101 corrosion, direction cap 11 is enclosed construction, and at the internal protection chamber 111 that protects to bearing end 101, protection chamber 111 separates with the outside, be equipped with grouting hole 601 with protection chamber 111 intercommunication on bearing plate 602 who bears seat 6, grouting hole 601 and inner bag 3 intercommunication, when grouting pipe 8 is to inner bag 3 slip casting, grout can be through grouting hole 601 to pouring into grout into in direction cap 11, the grout of pouring into can protect anchor nut 12 and the screw thread that bears end 101, improve the life of stock. The anchor nut in this embodiment constitutes a load bearing end connector that is connected to the load bearing end. In other embodiments, the bearing end connecting piece can be a split type conical clamping piece, the bearing plate is provided with a conical hole, and the bearing end is fixed on the bearing plate through the wedging action of the conical clamping piece.

In this embodiment, two grouting holes 601 are provided, one of the two grouting holes 601 is used for injecting cement slurry, and the other is used for exhausting gas when injecting cement slurry, so as to facilitate the injection of cement slurry. In other embodiments, the number of the grouting holes is increased according to the requirement, for example, more than three grouting holes are provided, and when the grouting holes are larger, it is also possible to provide one grouting hole.

When grout pours into the direction cap 11 in, because anchor nut 12 and bear and do not have sealedly between the seat 6, grout flows into fixed pipe 2 from the clearance easily, at last, flow out through outer bag seat 5, in order to solve this problem, set up plugging nut 21 on the stock body of rod 1, plugging nut 21 is in outer bag seat 5 upside and with outer bag seat 5 seal fit, be provided with sealed fat between plugging nut and the stock body of rod, plugging nut and anchor nut 12 are taut with the part that the stock body of rod 1 is in fixed pipe 2, and under plugging nut's sealing action, get into the grout in the fixed pipe 2 through the space between anchor nut 12 and the seat of bearing 6, can not flow out in the fixed pipe 2.

In this embodiment, in order to facilitate air exhaust, the air exhaust valve 13 is disposed on the outer bag seat plate 15, and air in the outer bag 4 can be exhausted through the air exhaust valve 13, which is beneficial to injecting cement slurry in the outer bag 4.

Use the utility model discloses a two bag expansion anchor rods at the anchoring operation time, at first punch to the target location, then insert the hole of beating with two bag expansion anchor rods, reach the target location after, through slip casting equipment to injecting into grout in the slip casting pipe 8, slip casting pipe check valve 9 is opened, grout passes through 8 slip casting pipes 3 slip casting of inside bag, after the slip casting is filled up in 3 interior bag bags of interior bag, also be full of grout in the protection chamber 111 of direction cap 11. After the inner bag 3 is filled with cement paste, the pressure in the inner bag 3 is increased, and after the pressure in the inner bag 3 reaches the opening pressure of the pressure control valve 10, the cement paste is injected into the outer bag 4 through the pressure control valve 10 until the grouting of the outer bag 4 is completed.

Because the inner bag 3 is positioned at the lower position in the outer bag 4, the lower part of the outer bag 4 can be firstly propped open by the inner bag 3, and the lower part of the outer bag 4 is prevented from forming a cone tip to influence the anchoring effect. The opening pressure of the pressure control valve 10 is greater than that of the grouting pipe check valve 9, so that the inner bag 3 can be fully opened, the bottom of the outer bag is fully supported, and the anchoring effect is further improved.

The bottom of the outer bag can overcome the resistance of sediment at the bottom of the anchor rod hole through the arranged inner bag, and the outer bag is fully opened, so that the lower end of the expanding head is larger in size, and the bearing effect is better.

The utility model discloses a concrete embodiment 2 of two bag expansion stock, the structure of two bag expansion stock in this embodiment only lies in with the difference of above-mentioned embodiment: in this embodiment, the upper end of the inner bag is directly fixed on the fixing tube, in order to ensure the sealing performance, the effect is better in the situation that only one fixing tube is provided, and the grouting tube is directly inserted into the inner bag and is in sealing fit with the inner bag in a bonding, bundling and other modes.

The utility model discloses a concrete embodiment 3 of two bag expansion stock, the structure of two bag expansion stock in this embodiment only lies in with the difference of above-mentioned embodiment: the opening pressure of the check valve of the grouting pipe in this embodiment is equal to the opening pressure of the pressure control valve. In other embodiments, the cracking pressure of the slip pipe check valve may be greater than the cracking pressure of the pressure control valve.

The utility model discloses a concrete embodiment 4 of two bag expansion stock, the structure of two bag expansion stock in this embodiment only lies in with the difference of above-mentioned embodiment: the pressure control valve is directly arranged on the inner bag, a valve seat is required to be arranged on the inner bag at the moment, and the pressure control valve is arranged on the valve seat.

The utility model discloses a concrete embodiment 5 of two bag expansion stock, the structure of two bag expansion stock in this embodiment only lies in with the difference of above-mentioned embodiment: in this embodiment, the lower extreme direct mount of inner bag is on fixed pipe, and this kind of condition is better in the occasion effect that has only a fixed pipe. At the moment, the protective cavity in the guide cap is communicated with the outer bag through the grouting hole.

The utility model discloses a concrete embodiment 6 of two bag expansion stock, the structure of two bag expansion stock in this embodiment only lies in with the difference of above-mentioned embodiment: in this embodiment, the pressure control valve is provided on the portion of the bladder grouting pipe inside the inner bladder.

The utility model discloses a concrete embodiment 7 of two bag expansion stock, the structure of two bag expansion stock in this embodiment only lies in with the difference of above-mentioned embodiment: in this embodiment, the guide cap is directly provided with a grouting hole, and cement slurry is injected into the guide cap through external grouting.

The utility model discloses a concrete embodiment 8 of two bag expansion stock, the structure of two bag expansion stock in this embodiment only lies in with the difference of above-mentioned embodiment: the outer bag and the inner bag are bonded on the bearing seat body. At this time, the hoop fitting ring groove does not need to be arranged on the bearing seat body, of course, in other embodiments, the hoop can also be directly hooped on the outer peripheral surface of the bearing seat cover, and at this time, the hoop fitting ring groove does not need to be arranged.

The utility model discloses a concrete embodiment 9 of two bag expansion stock, the structure of two bag expansion stock in this embodiment only lies in with the difference of above-mentioned embodiment: in this embodiment, outer bag seat and inner bag seat are all fixed on the stock body of rod, need not set up fixed pipe this moment. In other embodiments, the fixing tube can be replaced by a fixing rod, and two ends of the fixing rod are respectively fixed with the outer bag seat and the bearing seat.

The utility model discloses a specific embodiment 10 of two bag expansion stock, the structure of two bag expansion stock in this embodiment only lies in with the difference of above-mentioned embodiment: bearing structure includes outer bag seat, interior bag seat and the loading board of being fixed with the stock body of rod in this embodiment, and outer bag and interior bag are single pocket bag in this embodiment, and the fixed mode of outer bag can refer to the form that the publication is figure 1 in CN101324064A this moment, and interior bag seat sets up in outer bag, and interior bag upper end is fixed with interior bag seat, and the loading end of loading board and the stock body of rod all is in interior bag.

The utility model discloses a take concrete embodiment 11 of bag formula stock of enlarged footing, the structure of the bag formula stock of enlarged footing in this embodiment only lies in with the difference of above-mentioned embodiment: the rubber sleeve is fixed on the part of the anchor rod body in the fixed pipe and is in sealing fit with the fixed pipe, so that cement paste is prevented from flowing out of the fixed pipe. In other embodiments, the anchoring nut can be fixed on the bearing plate, so that cement paste is prevented from entering the fixing pipe from a gap between the anchoring nut and the bearing plate, and the cement paste is prevented from flowing out. In other embodiments, a sealing gasket is arranged between the anchoring nut and the bearing seat for sealing, so that cement slurry is prevented from entering the fixing pipe.

The above description is only for the preferred embodiment of the present invention, and the present invention is not limited thereto, the protection scope of the present invention is defined by the claims, and all structural changes equivalent to the contents of the description and drawings of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A dual-pocket expandable anchor comprising:

a load bearing structure;

the lower end of the anchor rod body is a bearing end arranged on the bearing structure;

the outer bag forms a sealed outer bag cavity inside and is fixed with the bearing structure;

the inner bag is positioned in the outer bag and fixed with the bearing structure, a sealed inner bag cavity is formed inside the inner bag, and the inner bag is close to the lower end of the outer bag and far away from the upper end of the outer bag;

the grouting pipe is used for grouting into the inner bag;

a grouting channel for grouting from the inner bag to the outer bag is arranged between the inner bag and the outer bag;

the grouting channel is characterized in that a pressure control valve is arranged on the grouting channel and used for opening the grouting channel after the pressure of cement slurry in the inner bag reaches a certain value, and water supply slurry enters the outer bag through the grouting channel.

2. The double-bag expanding anchor rod according to claim 1, wherein the grouting pipe is provided with a grouting pipe check valve, and the opening pressure of the grouting pipe check valve is smaller than that of the pressure control valve.

3. The dual bag expander anchor of claim 1 or 2, wherein the pressure control valve is a check valve.

4. The double-bag expanding anchor rod as claimed in claim 1 or 2, wherein the bearing structure comprises a bearing seat, an inner bag seat and an outer bag seat, the anchor rod body passes through the inner bag seat and the outer bag seat, the bearing end of the anchor rod body is fixed or matched with the bearing seat in a blocking manner, the inner bag seat is positioned in the outer bag, the upper end of the inner bag is fixed on the inner bag seat, the upper end of the outer bag seat is fixed on the outer bag seat, the lower end of the inner bag and the lower end of the outer bag are both fixed on the bearing seat, the grouting pipe passes through the outer bag seat and then is fixed on the inner bag seat, and the grouting channel is arranged on the inner bag seat.

5. The dual-bag expanding anchor rod of claim 4, wherein the dual-bag expanding anchor rod comprises a fixing tube, the anchor rod body passes through the fixing tube, the lower end of the fixing tube is fixed with the bearing seat, the upper end of the fixing tube is fixedly connected with the outer bag seat, and the inner bag seat is fixed with the fixing tube.

6. The double-bag expanding anchor rod as claimed in claim 4, wherein the inner bag seat is provided with a bag grouting pipe, a passage in the bag grouting pipe forms the grouting passage, and a pressure control valve is provided on the bag grouting pipe.

7. The double-bag expanding anchor rod according to claim 6, wherein one end of the bag grouting pipe extends into the outer bag, and the pressure control valve is provided on a portion of the bag grouting pipe extending into the outer bag.

8. The double-bag expanding anchor rod as claimed in claim 1 or 2, wherein a guide cap is fixed on the bearing structure, the bearing end of the anchor rod body extends into the guide cap, the guide cap and the bearing structure define a protection cavity for protecting the bearing end of the anchor rod body, a grouting hole communicated with the protection cavity is arranged on the bearing structure, and the grouting hole is communicated with the inner bag or the outer bag for cement paste in the inner bag or the outer bag to enter the protection cavity.

9. The double-bag expanding anchor of claim 8, wherein at least two grouting holes are provided.

10. The double-bag expanding anchor rod as claimed in claim 1 or 2, wherein the outer bag and/or the inner bag is fixed with the bearing structure through an anchor ear, the bearing structure is provided with an anchor ear matching ring groove, and the anchor ear is tightly hooped in the anchor ear matching ring groove;

the bearing structure comprises a bag seat sleeve for fixing an outer bag and/or an inner bag, the bag seat sleeve is provided with an annular bulge formed by outward bulging after the wall of the bag seat sleeve is formed by rolling, and at least one side groove wall of the hoop matching groove is formed by the annular bulge.

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