CN113585250B

CN113585250B - Recoverable air bag trigger type soil nail structure

Info

Publication number: CN113585250B
Application number: CN202110892950.XA
Authority: CN
Inventors: 曹海莹; 李朝阳
Original assignee: Yanshan University
Current assignee: Yanshan University
Priority date: 2021-08-04
Filing date: 2021-08-04
Publication date: 2022-08-19
Anticipated expiration: 2041-08-04
Also published as: CN113585250A

Abstract

The invention relates to a recyclable air bag triggering type soil nail structure which comprises a soil nail main body, an air bag triggering system, a linking system and an expanding end system, wherein the air bag triggering system is connected with the linking system; the soil nail main body comprises a circular tube and a cylinder; the cylinder is arranged in the lower area in the circular tube, and the circular tube and the cylinder are a fixed whole; the expansion end systems are symmetrically arranged on two sides of the bottom of the cylinder, and the top of the expansion end system is hinged with the bottom of the cylinder through a linking system; the upper part of the air bag triggering system is positioned in the cylinder and the round pipe, and the lower part of the air bag triggering system is positioned between two symmetrically arranged expanding end systems. The invention adopts the valve type soil nail expanded end, and utilizes the expansion of the air bag to form the expanded end at the end part of the soil nail, compared with the traditional soil nail, the invention does not need grouting, breaks through the friction type form of the existing soil nail in the whole field, enhances the stress of the soil nail and the stability of the side slope, can make the end part lose resistance after being used, realizes the recovery, has simple structure, strong soil quality adaptability and low operation difficulty.

Description

Recoverable air bag trigger type soil nail structure

Technical Field

The invention relates to the technical field of civil engineering foundation pit and side slope support reinforcement, in particular to a recyclable air bag trigger type soil nail structure.

Background

The soil nail supporting and reinforcing technology is a technology for carrying out in-situ reinforcement on volatile and stable soil bodies such as side slopes or foundation pits, and the tensile strength can be almost ignored due to the low shear strength of common soil bodies. The traditional soil nail reinforcing mode is that a rod piece is simply inserted into the soil body to improve the overall stability and the self strength of the soil body, but the friction force of the traditional reinforcing mode is very small and can not be recycled, and the reinforcing method has great limitation on the self strength of the soil body. When the implantation method of the soil nail is a drilling and grouting method, a drilling machine is required to drill a hole in a soil body, a reinforcing steel bar is placed, and then concrete is poured in the full-length range, the construction period of the drilling and grouting method is long, the soil nail main body and the grouting concretion body cannot be recycled, irretrievable influence is caused on development and utilization of the surrounding space, the cost ratio of the temporary supporting structure is extremely low, and the construction cost is high. The traditional soil nail is usually hit by a steel pipe or an angle steel when being directly hit, but the pulling resistance of the method is still smaller only by the friction force between the soil nail and the soil body, and the safety is greatly reduced when the soil quality is poor.

Disclosure of Invention

In view of the above problems, an object of the present invention is to provide a recoverable air bag triggered soil nail structure, which is convenient to construct, has strong soil property adaptability, and can effectively enhance the soil body reinforcing effect.

The technical scheme adopted by the invention is as follows:

the invention provides a recyclable air bag triggering type soil nail structure which comprises a soil nail main body, an air bag triggering system, a linking system and an expanding end system, wherein the air bag triggering system is connected with the linking system; the soil nail main body comprises a circular tube and a cylinder; the cylinder is arranged in the lower area in the circular tube, and the circular tube and the cylinder are a fixed whole; the expansion end systems are symmetrically arranged on two sides of the bottom of the cylinder, and the top of each expansion end system is hinged with the bottom of the cylinder through a linking system; the upper part of the air bag triggering system is positioned in the cylinder and the round pipe, and the lower part of the air bag triggering system is positioned between two symmetrically arranged expanding end systems and is used for triggering the expanding end systems through inflation and expansion.

Further, the air bag triggering system comprises a vent hole, an air bag and a vent pipe; the vent hole is arranged at the axis of the cylinder, and the vent pipe is arranged at the axis of the circular pipe; one end of the vent pipe is communicated with the vent hole, and the other end of the vent pipe extends to the outside of the circular pipe; the air bag is arranged between the two expanding end systems, and the opening end of the air bag is communicated with the vent hole.

Further, the air bag is spherical or cylindrical or calabash string-shaped and is made of high-strength rubber material; after the balloon is expanded, the radial dimension of the balloon is larger towards the inner part of the drilled hole.

Further, the vent pipe is made of a rubber material hose or a seamless metal hard pipe; and the length of the vent pipe extending to the outside of the round pipe is 150 mm and 500 mm.

Further, the link system comprises a hinge seat, a hinge shaft and a bolt; the bottom surface of the cylinder is fixedly connected with four hinged supports, the centers of the hinged supports are provided with round hinged holes, the tops of the two expansion end systems are provided with hinged holes with the same diameter as the round hinged holes in the centers of the hinged supports, and the tops of the two expansion end systems are respectively inserted into the hinged holes through hinged shafts to be hinged with the hinged supports; a small hole is reserved in one end of the hinge shaft for inserting the bolt, the diameter of the length of the other end of the hinge shaft is larger than that of the hinge hole, and when the hinge shaft is fixed through the bolt, the two ends of the hinge shaft are prevented from falling off from the hinge hole.

Furthermore, the expansion end system comprises a valve, a sliding chute, a sliding cover, a spring, a pin and a pin cap; the top of the valve is provided with a hinged hole with the same diameter as the hinged hole in the center of the hinged support, the valve is inserted into the hinged hole through a hinged shaft and hinged with the hinged support, the outer sides of the top and the bottom of the valve are fixedly connected with sliding grooves, a plurality of pin caps are uniformly arranged on the outer side surface of the valve, and each pin cap extends outwards; the upper end and the lower end of the sliding cover are respectively clamped in the sliding grooves at the top and the bottom; the springs are respectively sleeved on the pins, and pre-compressed and arranged between the sliding cover and the valve.

Furthermore, a pin hole corresponding to the pin is reserved on the sliding cover, and the pin penetrates through the sliding cover when the air bag triggering system is inflated to expand and push the valve.

Furthermore, the part between the hinge hole at the upper end of the valve and the top sliding groove is bent outwards for a certain angle, and the thickness of the part is gradually changed in a mode of being wide at the upper part and narrow at the lower part, so that the expansion space of the air bag triggering system and the linkage and rotation of the valve are increased.

Furthermore, the sliding cover is formed by splicing an upper symmetrical part and a lower symmetrical part through a sliding cover connecting plate, the splicing mode is that at least two groups of bolts and nuts are detachably connected through bolts, and two ends of the spliced integral sliding cover are arranged in the sliding groove and do not fall off and can slide along the sliding groove.

Further, the pin is in a conical shape or a cylindrical shape or a single blade shape or a cross blade shape.

Compared with the prior art, the invention has the following beneficial effects:

1. the original soil nail is broken through that the soil nail is in a friction type form in the whole field range, and the structure of the friction-like soil nail with the end part capable of providing resistance is improved, so that the stress of the soil nail is enhanced, and the stability of the side slope is improved;

2. when the soil nail is used, the resistance of the end part is lost by a delicate structure, the soil nail is smoothly pulled out, and the aim of recycling is fulfilled;

3. compared with the traditional soil nail, the soil property adaptability is stronger, grouting is not needed, the required materials are easy to obtain, the engineering cost is obviously reduced, the environment is friendly, the whole structure is simple, and the operation difficulty is lower.

Drawings

Fig. 1 is a schematic cross-sectional view illustrating a recyclable air bag triggered soil nail structure according to the present invention;

FIG. 2 is a schematic cross-sectional view of the airbag of FIG. 1 after activation;

FIG. 3 is a schematic perspective view of the linking system of FIG. 1;

FIG. 4 is a perspective view of the air bag and chute of FIG. 1;

FIG. 5 is a schematic perspective view of the enlarged end system of FIG. 1;

FIG. 6 is a schematic view of a splicing structure of the sliding cover in FIG. 5;

fig. 7 is a schematic cross-sectional, sectional view of various pin configurations.

Wherein, the reference numbers: 1-a soil nail main body; 2-an airbag triggering system; 3-a link system; 4-expanding the end system; 5-round pipe; 6-soil body; 7-a vent hole; 8-free bearing; 9-a hinge shaft; 10-a bolt; 11-a cylinder; 12-a flap; 13-an air bag; 14-a chute; 15-a sliding cover; 16-a spring; 17-a pin; 18-pin caps; 19-pin holes; 20-a slide cover connection plate; 21-bolt; 22-a nut; 23-air pipe.

Detailed Description

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

It should be noted that in the description of the present invention, it should be noted that the terms "upper", "lower", "top", "bottom", "one side", "the other side", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of describing the present invention and simplifying the description, but do not mean that a device or an element must have a specific orientation, be configured in a specific orientation, and be operated.

Referring to fig. 1 to 7, a specific structure of an embodiment of a recyclable air bag-triggered soil nailing structure according to the present invention is shown. The soil nail structure comprises a soil nail main body 1, an air bag triggering system 2, a linking system 3 and an expansion end system 4.

The soil nail main body 1 comprises a circular tube 5 and a cylinder 11; the cylinder 11 is arranged in the lower area of the circular tube 5, in this embodiment, the length of the circular tube 5 is 3-18cm, and the length of the cylinder 11 is 100-250 mm; the round tube 5 and the cylinder 11 are a fixed whole, the whole material is metal or PVC material, and the diameter is between 70mm and 280 mm; the expansion end systems 4 are symmetrically arranged on two sides of the bottom of the cylinder 11, and the top of each expansion end system 4 is hinged with the bottom of the cylinder 11 through a linking system 3; the upper part of the air bag triggering system 2 is positioned in the cylinder 11 and the circular tube 5, and the lower part of the air bag triggering system is positioned between the two symmetrically arranged expanding end systems 4 and is used for inflating and expanding to trigger the expanding end systems 4.

The air bag triggering system 2 comprises a vent hole 7, an air bag 13 and a vent pipe 23; the vent hole 7 is arranged at the axis of the cylinder 11, and the vent pipe 23 is arranged at the axis of the circular pipe 5; one end of the vent pipe 23 is communicated with the vent hole 7, and the other end of the vent pipe extends to the outside of the circular pipe 5; the air bag 13 is arranged between the two expansion end systems 4, and the opening end of the air bag is communicated with the vent hole 7; the air bag 13 is spherical, cylindrical or calabash string-shaped and is bound on the vent pipe 23 so as to inflate the air bag 13; in this embodiment, the air bag 13 is in a shape of a gourd string, and the air bag 13 is made of a high-strength rubber material; the diameters of the vent hole 7 and the vent pipe 23 are 10mm to 20mm, and the high-pressure inflation gas is not limited to air, nitrogen, oxygen or various rare gases capable of inflating the air bag 13; after the air bag 13 is expanded, the radial size of the air bag is larger towards the inner part of the drilled hole; the vent pipe 23 is made of a rubber material hose or a seamless metal hard pipe, and the length of the vent pipe 23 extending to the outside of the round pipe 5 is 150 mm and 500mm, so as to facilitate inflation and subsequent anchoring.

The link system 3 comprises a hinge base 8, a hinge shaft 9 and a bolt 10; the bottom surface of the cylinder 11 is fixedly connected with four hinged supports 8 in pairwise symmetry, the centers of the hinged supports 8 are provided with circular hinged holes, the tops of the expansion end systems 4 are provided with hinged holes with the same diameter as the circular hinged holes in the centers of the hinged supports 8, and the tops of the two expansion end systems 4 are inserted into the hinged holes through hinged shafts 9 and hinged with the hinged supports 8; a small hole is reserved at one end of the hinge shaft 9 for inserting the plug pin 10, the diameter of the length of the other end part is larger than that of the hinge hole, and when the hinge shaft 9 is fixed through the plug pin 10, two ends of the hinge shaft 9 can be prevented from falling off from the hinge hole; the bolt 10 can also be replaced by iron wires or steel wire binding, and the hinged support 8 and the hinged shaft 9 are made of metal materials.

The expansion end system 4 comprises a valve 12, a chute 14, a sliding cover 15, a spring 16, a pin 17 and a pin cap 18; the valves 12 are symmetrically arranged on two sides of the bottom of the cylinder 11, the top of each valve 12 is provided with a hinge hole with the same diameter as the hinge hole in the center of the hinge base 8, and the valves 12 are inserted into the hinge holes through hinge shafts 9 and hinged with the hinge bases 8; the outer sides of the top and the bottom of the valve 12 are fixedly connected with sliding grooves 14, a plurality of pin caps 18 are uniformly fixed on the outer side surface of the valve 12, each pin cap 18 is welded with a pin 17 in an extending mode, the pin 17 is conical or cylindrical or in a single-blade or cross-blade shape, the length of the pin 17 is 20-140mm, and the pin lengths on the same valve can be different; the sliding cover 15 is formed by splicing an upper symmetrical part and a lower symmetrical part through a sliding cover connecting plate 20, the splicing mode is that at least two groups of detachable bolts 21 and nuts 22 are used for connecting, and the upper end and the lower end of the spliced integral sliding cover 15 are respectively clamped in the sliding grooves 14 at the top and the bottom and do not fall off and can transversely slide along the sliding grooves 14; the length of the flap 12 is at least 1500mm, the thickness is 10-20mm, the width of the flap 12, the sliding grooves 14 and the sliding cover 15 is 50-250mm, the distance between the two sliding grooves 14 at the top and the bottom of each flap 12 is more than 400mm, the thickness of the sliding grooves 14 is at least 5mm, and the thickness of the sliding cover 15 is 5-10 mm; pin holes 19 corresponding to the pins 17 are reserved on the sliding cover 15, so that the pins 17 can penetrate through the sliding cover when the air bag 13 is inflated to expand and push the valve 12; the springs 16 are respectively and correspondingly sleeved on the pins 17, and are slightly pre-compressed and arranged between the inner side of the sliding cover 15 and the outer side of the valve 12; the components of the whole enlarged end system 4 are made of metal.

The part between the hinge hole at the upper end of the valve 12 and the top sliding groove 14 is bent outwards for a certain angle, and the thickness of the part is gradually changed in a mode of being wide at the upper part and narrow at the lower part, so that the expansion space of the air bag 13 and the linkage and rotation of the valve 12 are increased.

When the invention is used, the spring 16 is sleeved on the pin 17 outside the valve 12, the upper end and the lower end of the sliding cover 15 are clamped in the sliding grooves 14 at the top and the bottom respectively, and the sliding cover is connected into a whole by the bolt 21, the nut 22 and the sliding cover connecting plate 20, so that the reserved pin hole 19 can just correspond to the pin 17, the pin 17 can conveniently penetrate out during the work, and an enlarged head structure is formed at the moment; the cylinder 11 is fixed at the inner end of the circular tube 5, the air bag 13 is bound and connected with the vent pipe 23 by iron wires or steel wires and the like, and the vent pipe 23 penetrates through the vent hole 7 in the center of the cylinder 11 and extends out of the circular tube 5 to form an air bag triggering structure; finally, the whole expansion head is connected to a hinged support 8 on the bottom surface of a cylinder 11 by a hinged shaft 9 and a bolt 10 to form a whole soil nail structure; after the assembly is finished, a drilling machine is used for drilling holes in the soil body 6, the invention is conveyed into the soil body, the air pipe 23 is used as an inflation pipeline for inflating high-pressure air, the air enters the air bag 13 through the air hole 7 through the air pipe 23, when the air bag 13 is inflated and expanded to trigger, the valve 12 is pushed to rotate around the hinge shaft 9, the sliding chute 14, the pin 17, the spring 16 and the sliding cover 15 are driven to extrude towards the soil body 6, when the sliding cover 15 touching the soil body 6 is subjected to the reaction force of the soil body 6, the sliding cover 15 slides towards the inner edge along the sliding chute 14 at the moment, the sliding cover 15 starts to compress the spring 16, the spring 16 stores the compression force, the pin 17 extends out of a pin hole 19 reserved on the sliding cover 15 to enter the soil body, and the occlusion effect is generated; when the sliding cover 15 slides to the innermost edge of the sliding groove 14, the sliding cover 15 is pushed by the continuously inflating valve 12 to extrude the soil body to generate an end expanding effect, and the anchoring force is increased; the outer end of the round tube 5 can be provided with an air valve for sealing treatment after the inflation is finished and can be connected with a reinforcing mesh and the like; after the anchoring of the soil nails is finished, the air bag 13 can be deflated, at the moment, the compression force stored by the spring 16 is released, the pin 17 is pulled out of the soil body, the sliding cover 15 is pushed back to the outer edge of the sliding groove 14, the flaps 12 on the two sides automatically rotate around the hinge shaft 9 to the natural position, and the whole enlarged head and the circular tube 5 are recovered together under the action of external force.

The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention made by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. The utility model provides a recoverable type gasbag triggers formula soil nail structure which characterized in that: the soil nail structure comprises a soil nail main body, an air bag triggering system, a linking system and an expanding end system; the soil nail main body comprises a circular pipe and a cylinder; the cylinder is arranged in the lower area in the circular tube, and the circular tube and the cylinder are a fixed whole; the expansion end systems are symmetrically arranged on two sides of the bottom of the cylinder, and the top of the expansion end system is hinged with the bottom of the cylinder through a linking system; the upper part of the air bag triggering system is positioned in the cylinder and the round pipe, and the lower part of the air bag triggering system is positioned between the two symmetrically arranged expanding end systems and is used for triggering the expanding end systems by inflating and expanding;

the link system comprises a hinged support, a hinged shaft and a bolt; the bottom surface of the cylinder is fixedly connected with four hinged supports, the centers of the hinged supports are provided with round hinged holes, the tops of the two expansion end systems are provided with hinged holes with the same diameter as the round hinged holes in the centers of the hinged supports, and the tops of the two expansion end systems are respectively inserted into the hinged holes through hinged shafts to be hinged with the hinged supports; a small hole is reserved at one end of the hinged shaft for inserting a bolt, the diameter of the length of the other end part is larger than that of the hinged hole, and when the hinged shaft is fixed through the bolt, the two ends of the hinged shaft are prevented from falling off from the hinged hole;

the expansion end system comprises a valve, a sliding chute, a sliding cover, a spring, a pin and a pin cap; the top of the valve is provided with a hinged hole with the same diameter as the hinged hole in the center of the hinged support, the valve is inserted into the hinged hole through a hinged shaft and hinged with the hinged support, the outer sides of the top and the bottom of the valve are fixedly connected with sliding grooves, a plurality of pin caps are uniformly arranged on the outer side surface of the valve, and each pin cap extends outwards; the upper end and the lower end of the sliding cover are respectively clamped in the sliding grooves at the top and the bottom; the springs are respectively sleeved on the pins and are pre-compressed between the sliding cover and the valve;

a pin hole corresponding to the pin is reserved on the sliding cover, and the pin penetrates through the sliding cover when the air bag triggering system is inflated to expand and push the valve;

the part between the hinge hole at the upper end of the valve and the top sliding groove is bent outwards for a certain angle, and the thickness of the part is gradually changed in a mode of being wide at the upper part and narrow at the lower part, so that the expansion space of the air bag triggering system is increased, and the linkage and the rotation of the valve are increased.

2. The retrievable air bag triggered soil nail structure of claim 1, wherein: the air bag triggering system comprises a vent hole, an air bag and a vent pipe; the vent hole is arranged at the axis of the cylinder, and the vent pipe is arranged at the axis of the round pipe; one end of the vent pipe is communicated with the vent hole, and the other end of the vent pipe extends to the outside of the circular pipe; the air bag is arranged between the two expanding end systems, and the opening end of the air bag is communicated with the vent hole.

3. The retrievable air bag triggered soil nail structure of claim 2, wherein: the air bag is spherical, cylindrical or calabash string-shaped and is made of high-strength rubber material; after the balloon is expanded, the radial dimension of the balloon is larger towards the inner part of the drilled hole.

4. The retrievable air bag triggered soil nail structure of claim 2, wherein: the vent pipe is made of a rubber material hose or a seamless metal hard pipe; and the length of the vent pipe extending to the outside of the circular pipe is 150-500 mm.

5. The recyclable air bag triggered soil nailing structure of claim 1, wherein: the sliding cover is formed by splicing an upper symmetrical part and a lower symmetrical part through a sliding cover connecting plate, the splicing mode is that at least two groups of bolts and detachable bolts of nuts are used for connection, and the two ends of the spliced integral sliding cover are arranged in the sliding groove and do not fall off and can slide along the sliding groove.

6. The recyclable air bag triggered soil nailing structure of claim 1, wherein: the pin is in a conical shape or a cylindrical shape or a single blade shape or a cross blade shape.