CN216865135U - Grouting squeezing expansion anchor rod device - Google Patents

Abstract

A grouting squeezing anchor rod device comprises an anchor rod, wherein the anchor rod penetrates through a grouting pipe, a waterproof slurry-restraining bag is wrapped at the lower section of the grouting pipe, after the anchor rod is placed, grouting is performed in the grouting pipe through a grouting device at the top of the anchor rod, slurry is discharged from a slurry outlet hole of the grouting pipe into the slurry-restraining bag, soil around the grouting pipe is squeezed under the action of grouting pressure, and a grouting squeezing anchor rod is finally formed; the top of the anchor rod is anchored in the reinforced concrete foundation. The grouting squeezing and expanding anchor rod device does not need to adopt rotary spraying to expand the bottom on a construction site, reduces the investment of construction equipment and improves the construction efficiency; simplify the structure of the anchoring section rod body.

Description

Grouting squeezing expansion anchor rod device

Technical Field

The utility model relates to an anchor rod, in particular to a grouting squeezing-expanding anchor rod system and a construction method thereof, which are mainly used in the field of underground engineering.

Background

The basic model of the anchor rod is as follows: steel bar or steel strand mortar anchor rod. Cement mortar is used as the binder of the anchor rod and the surrounding rock. Also comprises an inverted wedge type metal anchor rod and a pipe seam type anchor rod. A resin anchor rod. The resin is used as the binder of the anchor rod, so the cost is higher. The commonly used expanded anchor rod technology in the market at present comprises plain slurry, capsule type expanded anchor rod technology and the like.

The capsule type expanded anchor rod has the advantages of good bearing performance, simple construction process, good economy and the like, thereby being widely applied to underground engineering anti-floating. However, the technology needs high-pressure rotary spraying and chambering for the anchor hole, the structure of the bag type expanded anchor rod is complex, the investment of construction equipment and the consumption of materials are large, and the cost is correspondingly high.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a grouting squeezing expansion anchor rod device which can be widely applied to various anti-floating and anti-tensile occasions and comprises an anchor rod body main body and an expansion head system formed by a slurry-binding bag component, can be applied to all expansion anchor rod technologies, aims to reduce the high-pressure rotary spraying and chambering process of a bag type expansion anchor rod, simplifies the structure of the anchor rod, forms an expansion anchor rod by carrying out constraint grouting in the slurry-binding bag wrapped outside the anchor rod body, and realizes the improvement of the anti-pulling bearing capacity of the anchor rod so as to be conveniently used for underground anti-floating engineering.

The utility model provides a grouting squeezing and expanding anchor rod device which comprises a grouting pipe and an anchor rod penetrating through the grouting pipe; the pulp bundling bag is coated on the radial outer side of the first grouting pipe section of the grouting pipe; the two ends of the slurry binding bag are hermetically fixed at the two ends of the first grouting pipe section, and the slurry binding bag is provided with a first profile with a smaller radial dimension in an un-grouting state and a second profile with a larger radial dimension in a grouting state.

Further, the grouting device also comprises an anchor seat for fixing the grouting pipe and the anchor rod, and a pressure bearing plate for fixing the anchor seat and the anchor rod;

and the outer anchor protective cover is arranged on the bearing plate to protect the anchor rod.

And further, the anchor rod fixing device further comprises an end bearing plate for fixing the bottom end of the anchor rod and a nut anchor or an extrusion anchor.

Furthermore, two ends of the slurry binding bag are fixed on the grouting pipe through a hoop.

Further, the pulp binding bag is waterproof.

Furthermore, the anchor rod adopts prestressed thread steel bars or unbonded steel strands.

The utility model provides a grouting squeezing expansion anchor rod and a construction technology thereof; the anchor rod penetrates through the grouting pipe, a waterproof slurry-bundling bag is wrapped at the lower section of the grouting pipe, after anchoring, grouting is carried out in the grouting pipe through a grouting device at the top of the anchor rod, slurry is discharged from a grouting hole of the grouting pipe into the slurry-bundling bag, soil around the anchor rod is squeezed and expanded under the action of grouting pressure, and finally a grouting squeezed and expanded anchor rod is formed; according to the anchor rod implantation mode, the grouting body-expanding anchor rod can be divided into drilling implantation and static pressure implantation.

Drawings

Other features, objects and advantages of the utility model will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:

FIG. 1; is a schematic diagram of an embodiment of a grouted reamed anchor structure according to an embodiment of the utility model;

FIG. 2 is a schematic view of an embodiment of a grouted reamed anchor structure according to an embodiment of the utility model;

FIG. 3 is a cross-sectional view of an embodiment of an anchor eye according to the present invention;

FIG. 4 is a cross-sectional view of an embodiment of an anchor eye according to the present invention;

FIG. 5 is a cross-sectional view of an enlarged body of a pulp binding bag according to an embodiment of the present invention;

FIG. 6 is a cross-sectional view of an enlarged body of a pulp binding bag according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of an embodiment of a grouting squeeze-enlarging system according to an embodiment of the utility model;

FIG. 8 is a schematic structural diagram of an embodiment of a grouting squeeze-and-expand system according to an embodiment of the present invention;

fig. 9 is an enlarged partial view of the portion of the bolt in which the grout outlet is located in fig. 7 and 8;

reference numerals:

1-bundling a pulp bag; 2-extruding the anchorage device; 3-injecting slurry into the slurry bag; 4-anchor hole grouting; 5-prestressed twisted steel; 6-a pressure bearing plate; 7-outer anchorage shield; 8-unbonded steel strands; 9-a carrier tray; 10-a transition tube; 11-an anchor block; 12-a nut anchor; 13-grouting pipe; 141-a first pulp pocket stop; 142-a second bale stop; 143-third bunch of pulp pocket limiters; 151-upper sealing clamp; 152-a lower seal collar; 16-a grouting device; 171-a first set of slurry outlet holes; 172-second set of slurry outlet holes; 18-end deck plate; 19-connecting the steel sleeve; 201-first grouting valve limit; 202-a second grouting valve stop; 203-third grouting valve limit;

Detailed Description

The technical contents of the preferred embodiments of the present invention will be more clearly and easily understood by referring to the drawings attached to the specification. The present invention may be embodied in many different forms of embodiments and the scope of the utility model is not limited to the embodiments set forth herein.

In the drawings, structurally identical elements are represented by like reference numerals, and structurally or functionally similar elements are represented by like reference numerals throughout the several views. The size and thickness of each component shown in the drawings are arbitrarily illustrated, and the present invention is not limited to the size and thickness of each component. The thickness of the components may be exaggerated where appropriate in the figures to improve clarity.

As shown in fig. 1 and 2, fig. 7 and 8, and fig. 9.

A slip casting squeezing anchor rod comprises a slip casting pipe 13 which is sleeved on the anchor rod, and the anchor rod comprises a squeezing section; the portion of the grouting pipe 13 in the squeezing section is provided with non-return grout outlet holes 171 and 172, and the radial outer side of the pipe section of the corresponding grouting pipe 13 of the squeezing section is coated with a grout bag 1; the two ends of the slurry bag 1 are hermetically fixed on the grouting pipe 13.

As shown in fig. 7 and 8, the grout bag 1 is limited at the position of the anchor rod by a first grout bag limiting part 141, a second grout bag limiting part 142 and a third grout bag limiting part 143, the anchor rod surrounded by the grout bag 1 can be defined as an extruded section of the anchor rod, and the grout bag 1 can be fixed on the anchor rod in a sealing manner by an upper sealing clamp 151 and a lower sealing clamp 152; wherein, go up sealed clamp 151 set up in restraint thick liquid bag 1 upper end in order to seal restraint the last port of thick liquid bag 1, first thick liquid bag locating part 141 and second restraint thick liquid bag locating part 142 set up in the upper and lower both ends of last sealed clamp 151 are in order to fix the position of sealed clamp 151, sealed clamp 152 is set up down in restraint thick liquid bag 1 lower extreme, thick liquid bag locating part 143 is set up in the upper end of sealed clamp 152 and end bearing plate 18 are fixed the position of sealed clamp 152 down together down, in order to seal restraint the lower port of thick liquid bag 1.

As shown in fig. 1, the anchor rod adopts prestressed twisted steel 5, and as shown in fig. 2, the anchor rod adopts unbonded steel stranded wires 8; the lower ends of the prestressed twisted steel bars 5 or the unbonded steel stranded wires 8 penetrate through the slurry binding bag 1 and are fixed with the nut anchorage 12 or the extrusion anchorage 2 through the end bearing plate 18; the outer anchor fixing device is arranged outside the anchor rod hole and used for fixing the upper end of the anchor rod so as to prevent the anchor rod from deforming; the grouting pipe 13 is fixed with an anchor seat 11 of the anchor rod, the part of the grouting pipe 13 in the anchor seat 11 can also be called as a transition pipe 10, and the anchor seat 11 is fixed with a bearing plate 6 of the anchor rod; and an outer anchor shield 7 provided on the pressure plate 6 to protect the anchor rod.

The anchor rod also comprises an end bearing plate 18 for fixing the bottom end of the anchor rod and a nut anchor 12 or an extrusion anchor 2; two ends of the pulp binding bag 1 are fixed on the anchor rod by clamps (151, 152).

The pulp binding bag 1 is waterproof. For example, it can be made with a single ply of velon tarpaulin. The height along the slip casting pipe may be any value of 1m to 7 m.

The slurry binding bag 1 is in a shape basically fitting the outline of a grouting pipe before grouting and expansion; the slurry binding bag 1 forms a radially larger profile shape after grouting expansion, and the diameter of the slurry binding bag can reach 300-600 mm. The bottom of the anchor rod is provided with an end bearing plate, and one side of the end bearing plate is welded with a grouting pipe of the squeezing and expanding section; when the rod body is made of prestressed screw steel, the other side of the rod body is welded with the nut, and when the rod body is made of prestressed steel strands, the rod body is welded with the extrusion anchorage device.

In addition, the top of the anchor rod is provided with a grouting device, one end of the grouting device is in threaded connection with a rod body grouting pipe sleeve, the other end of the grouting device is provided with a sealing plate, a steel sleeve is welded on the sealing plate for subsequent grouting, and the grouting device is used for grouting the squeezing anchor rod for grouting and recycling.

Example 1 is that the rod body is a prestressed twisted steel bar 5;

a grouting squeezing expansion anchor rod and a construction method thereof comprise the following steps:

as shown in fig. 7, the anchor rod adopts the prestressed threaded steel bar 5, penetrates through the end bearing plate 18 and is fixed through the nut anchorage 12, and only one steel bar 5 is needed to meet the requirement of anti-floating stress due to the higher strength of the prestressed threaded steel bar 5;

a prestressed threaded steel bar 5 is used as an anchor rod to penetrate through a grouting pipe 13, grout outlet holes 171 and 172 are provided at the part of the grouting pipe 13 in the squeezing and expanding section, a grout-binding bag 1 is coated on the radial outer side of the squeezing and expanding section, and two ends of the grout-binding bag 1 are hermetically fixed on the anchor rod; the bottom end of the anchor rod is fixed with a nut anchor 12 by adopting an end bearing plate 18;

the material of the pulp binding bag 1 in the embodiment is waterproof canvas; the slurry outlet holes 171 and 172 comprise a first slurry outlet hole group 171 and a second slurry bundling hole group 172, and the anchor rod further comprises a grouting valve limiting component which is a first grouting valve limiting part 201, a second grouting valve limiting part 202 and a third grouting valve limiting part 203; the two groups of grout outlet holes have a non-return function and are uniformly distributed among the first, second and third grouting valve limiting parts 201, 202 and 203, so that rubber rings which are used for fixing the outer sides of the grout outlet holes 171 and 172 of the grouting pipe 13 to realize the non-return function do not move at the position of the grouting pipe during grouting.

After the position of an anchor rod hole is determined in a construction area, moving a drilling machine to enable a drill bit to be aligned to the anchor rod hole position to be constructed, and drilling until the designed elevation is reached; after the designed elevation is reached, the drill bit is ensured to continuously and stably rotate for a period of time, and the floating soil in the hole is emptied; replacing the mud in the hole with cement paste, wherein the water cement ratio of the prepared cement paste is 0.7;

before the cement paste is initially set, a grouting squeeze anchor rod is anchored in the cement paste at the pile position until a slurry bag at the top end of the anchor rod reaches the designed elevation;

curing the cement paste to initially set the cement;

after the maintenance is finished, connecting the anchor rod top grouting device 16 with the grouting steel pipe 13 by using a steel sleeve 19;

injecting cement slurry into the grouting pipe 13 at high pressure through a grouting device 16, wherein the water cement ratio of the prepared cement slurry is 0.50; the cement slurry flows out from the slurry outlet holes 171 and 172 with the non-return function of the grouting pipe 13 and enters the slurry binding bag 1; the slurry binding bag 1 is expanded under high-pressure grouting and extrudes and expands soil around the anchor rod to form an expanded head, and the diameter of the expanded head can be 300-600 mm;

maintaining the cement slurry of the expansion head;

as shown in fig. 3 and 4, and fig. 5 and 6, after the grouting pipe 13 is injected with cement paste, the anchor hole is filled with the anchor hole grouting material 4, the enlarged head part is filled with the grouting material 3 in the grout-restraining bag, and the top of the anchor rod is anchored in the reinforced concrete foundation.

Fixing the anchor rod in the foundation by using an anchor seat 11 and a pressure bearing plate 6 and sleeving the anchor rod by using an outer anchor device protective cover 7 for protection; the method is that the transition pipe 10 is sleeved into the steel bar 5 or the steel strand 8 outside the anchor hole; set up anchor block 11 outside transition pipe 10, fix outer anchorage device 2 above anchor block 11 with bearing plate 6, cut off reinforcing bar 5 or steel strand wires 8, cover outer anchorage device 2 on bearing plate 6 with outer anchorage device guard shield 7, accomplish the fixed of the stock body of rod upper end, this fixed permanent engineering of being applied to.

There are other embodiments in which the bearing plate 6 is replaced by a carrier disc 9.

Example 2 is the rod body is an unbonded steel strand 8;

a grouting squeezing expansion anchor rod and a construction method thereof comprise the following steps:

as shown in fig. 8, the anchor may be provided by unbonded steel strands 8, the strands 8 being passed through an end bearing plate 18 and secured by a compression anchor 2; since the unbonded steel strands 8 are thin, four steel strands 8 are generally required to meet the requirement of anti-floating force.

The unbonded steel strand 8 is used as an anchor rod to penetrate through a grouting pipe 13, grout outlet holes 171 and 172 are provided at the part of the grouting pipe 13 in the squeezing and expanding section, a grout bag 1 is coated on the radial outer side of the squeezing and expanding section, and two ends of the grout bag 1 are hermetically fixed on the anchor rod; the bottom end of the anchor rod is fixed with the extrusion anchor device 2 by adopting an end bearing plate 18;

the material of the pulp binding bag 1 in the embodiment is waterproof canvas; the slurry outlet holes 171 and 172 comprise a first slurry outlet hole group 171 and a second slurry bundling hole group 172, and the anchor rod further comprises a grouting valve limiting component which is a first grouting valve limiting piece 201, a second grouting valve limiting piece 202 and a third grouting valve limiting piece 203; the two groups of grout outlet holes have non-return function and are uniformly distributed among the first, second and third grouting valve limiting parts 201, 202 and 203, so that the rubber rings which realize the non-return function outside the grout outlet holes 171 and 172 of the grouting pipe 13 are fixed and do not move on the grouting pipe during grouting.

After the position of an anchor rod hole is determined in a construction area, a static pile press is moved to align an anchor rod with a steel sleeve to the position of the anchor rod hole to be constructed for static pressure till the slurry-restraining bag 1 of the anchor rod reaches an enlarged head forming area, specifically 1 to 7 meters of the depth of a soil body;

after reaching the design elevation, a static pile machine is used for pulling out the steel sleeve;

injecting cement slurry into the hole;

curing the cement paste to enable the cement paste to be initially set;

after the maintenance is finished, the anchor rod top grouting device and the grouting pipe are connected through welding by a steel sleeve 19;

injecting cement slurry into the grouting pipe 13 at high pressure through a grouting device 16, wherein the water-cement ratio of the prepared cement slurry is 0.7; the cement slurry flows out from the slurry outlet holes 171 and 172 with the non-return function of the grouting pipe 13 and enters the slurry binding bag 1; the slurry binding bag 1 is expanded under high-pressure grouting and extrudes and expands the soil around the anchor rod to form an expanded head, and the diameter of the expanded head can be 300-600 mm;

maintaining the cement slurry of the expansion head;

as shown in fig. 3 and 4, and fig. 5 and 6, after the grouting pipe is filled with cement paste, the anchor hole is filled with anchor hole grouting material 4, the enlarged head part is filled with grouting material 3 in the grout-restraining bag, and the top of the anchor rod is anchored in the reinforced concrete foundation.

Fixing the anchor rod in the foundation by using an anchor seat 11 and a bearing plate 6 and sleeving the anchor rod by using an outer anchor device protective cover 7 for protection; the method is that the transition pipe 10 is sleeved into the steel bar 5 or the steel strand 8 outside the anchor hole; the anchor seat 11 is arranged outside the transition pipe 10, the outer anchor 2 above the anchor seat 11 is fixed by the bearing plate 6, the steel bar 5 or the steel strand 8 is cut off, the outer anchor 2 is covered on the bearing plate 6 by the outer anchor protective cover 7, the fixing of the upper end of the anchor rod body is completed, and the fixing is applied to permanent engineering.

There are other embodiments in which the bearing plate 6 is replaced by a carrier disc 9.

The grouting squeezing expansion anchor rod provided by the utility model is applied to an anti-floating anchor rod which replaces a high-pressure rotary spraying bottom expansion to form an expansion head. The rotary spraying bottom expanding is not needed in a construction site, so that the investment of construction equipment is reduced, and the construction efficiency is improved; the structure of the rod body of the anchoring section is simplified, and the sleeve on the outer side of the rod body is used as a grouting pipe, so that the anchor rod material is saved; the grouting squeezing expanding uplift bearing capacity is improved more obviously, the length of the uplift anchor rod can be saved, the economy is good, and the application range is wide.

The foregoing detailed description of the preferred embodiments of the utility model has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.

Claims (7)

1. The utility model provides a crowded stock device that expands of slip casting which characterized in that: comprises that

The size of the grouting pipe is adjusted,

the anchor rod penetrates through the grouting pipe;

the pulp bundling bag is coated on the radial outer side of the first grouting pipe section of the grouting pipe; both ends of the slurry bag are hermetically fixed at both ends of the first grouting pipe section, and the slurry bag is provided with a first profile with a first radial dimension in an un-grouting state and a second profile with a second radial dimension in a grouting state; the second radial dimension is greater than the first radial dimension;

wherein at least one non-return grouting hole is provided on the first grouting pipe section to communicate the beam bag and the inside of the grouting pipe.

2. The grouting squeeze anchor device according to claim 1, wherein: the grouting device is characterized by further comprising an anchor seat for fixing the grouting pipe and the anchor rod, and a pressure bearing plate for fixing the anchor seat and the anchor rod.

3. The grouting reamed anchor rod device according to claim 1, wherein: the anchor rod fixing device further comprises an end bearing plate and a nut anchor or an extrusion anchor, wherein the end bearing plate is used for fixing the bottom end of the anchor rod.

4. The grouting squeeze anchor device according to claim 1, wherein: and two ends of the slurry binding bag are fixed on the grouting pipe by adopting a hoop.

5. The grouting squeeze anchor device according to claim 1, wherein: the pulp binding bag is waterproof.

6. The grouting squeeze anchor device according to claim 1, wherein: the first grout tube segment is formed on a portion of the grout tube proximate to an end support plate.

7. The grouting squeeze anchor device according to claim 1, wherein: the non-return grout outlet comprises a grout outlet and a rubber ring wrapping the grout outlet.

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