CN110500126B - Grouting joint for hollow anchor rod and construction process for hollow anchor rod - Google Patents
Grouting joint for hollow anchor rod and construction process for hollow anchor rod Download PDFInfo
- Publication number
- CN110500126B CN110500126B CN201910892949.XA CN201910892949A CN110500126B CN 110500126 B CN110500126 B CN 110500126B CN 201910892949 A CN201910892949 A CN 201910892949A CN 110500126 B CN110500126 B CN 110500126B
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- Prior art keywords
- anchor rod
- grouting
- hollow anchor
- joint
- section
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000010276 construction Methods 0.000 title claims abstract description 18
- 210000001503 joint Anatomy 0.000 claims abstract description 13
- 238000007789 sealing Methods 0.000 claims abstract description 7
- 238000003466 welding Methods 0.000 claims description 16
- 239000011440 grout Substances 0.000 claims description 9
- 230000002441 reversible effect Effects 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 238000005553 drilling Methods 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000004880 explosion Methods 0.000 abstract description 5
- 230000000903 blocking effect Effects 0.000 abstract description 2
- 238000007569 slipcasting Methods 0.000 description 8
- 239000002002 slurry Substances 0.000 description 8
- 239000004568 cement Substances 0.000 description 6
- 239000007788 liquid Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 101100366060 Caenorhabditis elegans snap-29 gene Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
- E21D20/021—Grouting with inorganic components, e.g. cement
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
- E21D20/028—Devices or accesories for injecting a grouting liquid in a bore-hole
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
Abstract
The invention discloses a grouting joint for a hollow anchor rod, which comprises an inner sleeve and an outer sleeve, wherein limit steps and grouting pipe binding grooves are arranged on the outer wall of the inner sleeve at intervals front and back, the inner wall of the outer sleeve is sequentially divided into a thread section, a unthreaded hole section and a necking section front and back, the thread section is used for being screwed and fixed with the end thread of the hollow anchor rod, the diameter of the unthreaded hole section is larger than that of the thread section and the necking section, the outer sleeve is sleeved on the inner sleeve, the limit steps can slide in the unthreaded hole section to realize the front and back movement of the outer sleeve relative to the inner sleeve, the front end of the inner sleeve is provided with a conical head, and the inner diameter of the hollow anchor rod is between the inner diameter and the outer diameter of the conical head, so that the conical head can be locally inserted into the hollow anchor rod to realize butt joint sealing. Meanwhile, the invention also discloses a hollow anchor rod construction process. When the grouting joint is used for constructing an empty anchor rod, the operation is simple and practical, the cost is saved, the grouting joint is safe and reliable, the grouting joint can be prevented from leaking, grouting is ensured to be full, and pipe blocking and pipe explosion are avoided.
Description
Technical Field
The invention belongs to the technical field of tunnel construction, and particularly relates to a grouting joint used for grouting a hollow anchor rod of a tunnel and a process for constructing the hollow anchor rod by using the grouting joint.
Background
The hollow anchor rod is widely used in tunnel construction, for example, a main cavity anchor rod adopts a common hollow anchor rod with the specification of phi 28 x 5.5mm and length 6 m. The key quality of the hollow anchor rod is that the grouting of the anchor rod is carried out, the fullness of the grouting directly influences whether the anchor rod is qualified or not, and the grouting fullness is based on the judgment of the grouting of the anchor rod hole wall. The grouting pipe is connected with the hollow anchor rod through the grouting joint, and the connecting part where the grouting joint is located plays a key role in the grouting process.
Fig. 5 shows a grouting joint commonly used in the grouting process of a cave depot anchor rod, and the grouting joint consists of a connecting bolt 5 and an auxiliary connecting pipe 6. The front section of the connecting pipe bolt 5 is provided with internal threads for being screwed with external threads of the hollow anchor rod 3, the rear section of the connecting pipe bolt 5 is provided with external threads for being screwed with internal threads of the front section of the auxiliary connecting pipe 6, a plurality of annular grooves are formed in the outer wall of the rear section of the auxiliary connecting pipe 6, the grouting pipe 4 is sleeved on the annular groove sections and is fixedly bound, and the cross sections of the annular grooves are inverted teeth, so that the bound grouting pipe 4 can be prevented from being withdrawn. Two operating rods 5a are welded on the outer wall of the connecting bolt 5. The hollow anchor rod 3 aims to take down the hollow anchor rod 3 and the grouting pipe 4 at each time, and two interfaces are arranged between the hollow anchor rod 3 and the grouting pipe 4 except for binding parts, so that slurry leakage is serious in the grouting process, and the slurry reverse effect is not very good.
The main problems of this structure are illustrated in the following four aspects:
1. operability of
When the grouting joint is screwed in or out from the hollow anchor rod, the grouting joint and the grouting pipe are required to be bound and combined for grouting before grouting of the next hollow anchor rod, so that the grouting is very troublesome. Moreover, the grouting joint and the hollow anchor rod do not have corresponding butt joint, the reserved gap is large, the number of the joints is large, a closed whole is difficult to form, each grouting must be carried by a person to hold the operating rod, and the operation is complex in the whole use process.
2. Practicality of use
In the grouting process, the leakage of the two joints is serious, so that the grouting effect in the hollow anchor rod hole is not good during grouting, and the grouting is not full; the slurry leakage also causes too much slurry on the operation platform, which is unfavorable for the running and cleaning of equipment, and if the slurry is stirred according to the designed mixing proportion, the condition of pipe blockage often exists, which results in time and labor waste.
3. Economical efficiency
In the grouting process, the leakage is serious, so that the consumption of cement is increased, a hollow anchor rod with the volume of 6 meters is adopted, 2-3 bagged cement with the volume of 50kg can be grouted on site, and the loss of the linear meter is large (the ratio of water to cement is 0.45:1).
4. Safety of
Operators need to hold grouting joints, grouting machines have certain pressure in the grouting process, the grouting machines are not in place in butt joint due to joint positions, blockage is easy to occur at the position of an auxiliary connecting pipe, grouting pressure and air in the pipe are too large, pipe explosion is easy to occur, certain potential safety hazards are caused for operators, and certain damage is caused to equipment.
Disclosure of Invention
The invention aims to provide a hollow anchor rod grouting joint which is economical, practical, high in safety and convenient to operate, and can prevent the joint from leaking slurry, ensure full grouting and avoid pipe blockage and pipe explosion.
The technical scheme adopted by the invention is as follows: the utility model provides a cavity stock slip casting connects, includes interior sleeve pipe and outer tube, interval is provided with spacing step and slip casting pipe ligature groove around on the outer wall of interior sleeve pipe, the inner wall of outer tube is divided into screw thread section, unthreaded hole section and throat section around in proper order, screw thread section is used for screwing fixedly with the end screw thread of cavity stock, and the diameter of unthreaded hole section is greater than the diameter of screw thread section, throat section, the outer tube cover is on interior sleeve pipe, and spacing step can slide in unthreaded hole section, realizes the relative interior sleeve pipe back-and-forth movement of outer tube, interior sleeve pipe's front end is provided with the conical head, and the internal diameter of cavity stock is between the internal diameter and the external diameter of conical head for the conical head can realize the butt joint in the local insertion cavity stock and seal.
Preferably, the outer sleeve is formed by welding a front section and a rear section, and the welding surface just forms the front end surface of the unthreaded hole section. Adopt two segmentation welded structure, make things convenient for manufacturing, set up the initial position department at unthreaded hole section with the welding face, be close to the middle part of outer tube more, can guarantee the outer tube bulk strength after the welding.
Still preferably, holding baffle plates are welded on the left and right sides of the outer wall of the outer sleeve relatively, and welding lines of the holding baffle plates vertically intersect with welding lines of the front section and the rear section of the outer sleeve. The holding baffle is additionally arranged, so that the grouting joint can be screwed up by an operator under the condition of wearing rubber gloves; the welding seam of the holding baffle spans the front section and the rear section of the outer sleeve, so that the integral strength can be ensured.
Meanwhile, the invention also provides a hollow anchor rod construction process, which comprises the following steps:
firstly, lofting anchor rod hole sites;
secondly, drilling holes in the anchor rod holes;
thirdly, installing a hollow anchor rod;
fourthly, connecting the hollow anchor rod with the grouting pipe through a grouting joint;
fifthly, grouting the hollow anchor rod;
sixthly, separating the grouting joint from the end head of the hollow anchor rod;
seventh, constructing the next hollow anchor rod until all hollow anchor rods are constructed;
in the fourth step, the outer sleeve of the grouting joint is firstly slid backwards relative to the inner sleeve, so that the conical head of the inner sleeve is exposed and is partially inserted into the inner hole of the end head of the hollow anchor rod to realize butt joint sealing, and then the outer sleeve is screwed forwards and is locked with the external thread of the hollow anchor rod through the thread section, so that the grouting joint is connected with the hollow anchor rod; the front end of the grouting pipe is sleeved into the rear end of the inner sleeve and is fixedly bound on a grouting pipe binding groove through steel wires, so that the grouting joint is connected with the grouting pipe; the connection of the grouting joint and the hollow anchor rod can be performed before the connection of the grouting joint and the grouting pipe or after the connection of the grouting joint and the grouting pipe;
in the fifth step, air in the grouting joint directly flows out from the outer wall of the hollow anchor rod along the inner hole of the hollow anchor rod under the pressure of the grout during grouting until the grout is full to form reverse grout, and grouting is completed;
in the sixth step, when the grouting joint is separated from the end head of the hollow anchor rod, the grouting pipe is not required to be taken down from the grouting joint, the outer sleeve is screwed backwards to separate the threaded section from the external thread of the hollow anchor rod, the inner sleeve does not rotate at the moment, and then the conical head of the inner sleeve is taken out from the inner hole of the end head of the hollow anchor rod;
in the seventh step, when the construction of the next hollow anchor rod is carried out, only the grouting connector is connected with the corresponding hollow anchor rod, and the connection of the grouting connector and the grouting pipe is not needed.
The beneficial effects are that: the grouting joint is simple and practical to operate, saves cost, is safe and reliable, and is particularly characterized in the following aspects:
1. operability of
The grouting joint is an integral body, the front end of the joint is connected with the reserved end of the hollow anchor rod through threads, the rear end of the joint is fixedly bound with the grouting pipe, and because the outer sleeve can rotate 360 degrees relative to the inner sleeve, the outer sleeve can rotate randomly according to practical conditions and is tightly buckled with the hollow anchor rod after being connected with the hollow anchor rod, so that a closed movable integral body is formed.
2. Practicality of use
The front end of the inner sleeve is provided with the conical head, the inner diameter of the hollow anchor rod is between the inner diameter and the outer diameter of the conical head, so that the conical head can be locally inserted into the hollow anchor rod to realize butt joint sealing, thick paste is pressed into an inner hole of the hollow anchor rod, the tightness is high, the joint cannot leak paste in the grouting process, the grouting fullness is ensured, and workers can obviously judge the anchor rod grouting time. The grouting completion time of one hole is shortened by nearly half of the time (about 50 seconds are needed for improving the previous hole, and about 30 seconds are needed for improving the previous hole).
3. Economical efficiency
The grouting joint has good tightness, slurry cannot be easily missed, the same anchor rod of 6 meters can be used for grouting 4-5 bagged cements of 50kg, and compared with each anchor rod of 6 meters before improvement, the grouting joint can save about 6kg of bagged cements, which is equivalent to saving about 1kg (0.56 yuan) of bagged cements per linear meter, thereby saving the cost and achieving the grouting effect.
4. Safety of
After improvement, when carrying out the construction of cavity stock through this slip casting joint, constructor need not to hold the slip casting joint, slip casting joint and slip casting pipe at first form a whole, because the conical head diameter of interior sleeve pipe is great, directly dock with cavity stock hole, the screw thread section of rethread movable outer tube overlaps with cavity stock, the air in the slip casting joint flows out through cavity stock outer wall again under the pressure of thick liquid directly along cavity stock hole when the slip casting, until thick liquid is full to form the reverse thick liquid, leakage, stifled pipe and pipe explosion have effectively been avoided, the potential safety hazard is reduced and the influence to equipment.
By the above, when the grouting joint is used for the construction of the hollow anchor rod, the characteristics of simplicity in operation, practicability, cost saving, safety and reliability can be better reflected, the joint can be prevented from leaking slurry, grouting plumpness is ensured, and pipe blocking and pipe explosion are avoided.
Drawings
Fig. 1 is a front view of the present hollow bolt grouting joint.
Fig. 2 is a cross-sectional view A-A of fig. 1.
Fig. 3 is a perspective view of the present invention.
Fig. 4 is a schematic flow chart of a hollow anchor rod construction process.
Fig. 5 is a view showing a state of use of a conventional grouting joint.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
referring to fig. 1-3, a hollow anchor rod grouting joint mainly comprises an inner sleeve 1 and an outer sleeve 2.
A limit step 1a and a grouting pipe binding groove 1b are arranged on the outer wall of the inner sleeve 1 at intervals front and back.
The inner wall of the outer sleeve 2 is sequentially divided into a thread section 2a, a unthreaded hole section 2b and a necking section 2c. The thread section 2a is used for being screwed and fixed with the end thread of the hollow anchor rod, and the end thread of the hollow anchor rod is an external thread. The diameter of the unthreaded hole section 2b is larger than that of the threaded section 2a and the necking section 2c, the outer sleeve 2 is sleeved on the inner sleeve 1, and the limiting step 1a can slide in the unthreaded hole section 2b, so that the outer sleeve 2 can move back and forth relative to the inner sleeve 1. The forward and backward movement amount of the outer sleeve 2 relative to the inner sleeve 1 is determined by the length of the unthreaded hole section 2b, and is designed according to the end thread section of the hollow anchor rod.
The front end of the inner sleeve 1 is provided with a conical head 1c, and the inner diameter of the hollow anchor rod is between the inner diameter and the outer diameter of the conical head 1c, so that the conical head 1c can be partially inserted into the hollow anchor rod to realize butt joint sealing.
Preferably, the outer sleeve 2 is formed by welding front and rear sections, and the welding surface just forms the front end surface of the unthreaded hole section 2b, so that the welding surface is closer to the middle of the outer sleeve 2.
In addition, the left and right sides of the outer wall of the outer sleeve 2 are oppositely welded with holding baffle plates 2d, and welding lines of the holding baffle plates 2d are perpendicularly intersected with welding lines of the front section and the rear section of the outer sleeve 2, so that the front section of each holding baffle plate 2d is welded on the front section of the outer sleeve 2, and the rear section of the holding baffle plate 2d is welded on the rear section of the outer sleeve 2.
Referring to fig. 1 to 4, a hollow anchor rod construction process comprises the following steps:
and step one, lofting the anchor rod hole site.
And secondly, drilling holes in the anchor rod.
And thirdly, installing a hollow anchor rod.
And fourthly, connecting the hollow anchor rod with the grouting pipe through the grouting joint. In the step, the hollow anchor rod grouting joint is used, the outer sleeve 2 of the grouting joint is firstly slid backwards relative to the inner sleeve 1, the conical head 1c of the inner sleeve 1 is exposed and is partially inserted into the inner hole of the end head of the hollow anchor rod to realize butt joint sealing, and then the outer sleeve 2 is screwed forwards and is locked with the external thread of the hollow anchor rod through the thread section 2a, so that the grouting joint is connected with the hollow anchor rod. The front end of the grouting pipe is sleeved into the rear end of the inner sleeve 1 and is fixed on the grouting pipe binding groove 1b through steel wire binding, so that the grouting joint is connected with the grouting pipe. The connection of the grouting joint and the hollow anchor rod can be performed either before or after the connection of the grouting joint and the grouting pipe.
And fifthly, grouting the hollow anchor rod. When grouting, air in the grouting joint directly flows out along the inner hole of the hollow anchor rod under the pressure of the grout and then flows out through the outer wall of the hollow anchor rod until the grout is full to form reverse grout, and grouting is completed.
And sixthly, separating the grouting joint from the end head of the hollow anchor rod. When the grouting joint is separated from the end of the hollow anchor rod, the grouting pipe does not need to be taken down from the grouting joint, the outer sleeve 2 is screwed backwards to separate the threaded section 2a from the external thread of the hollow anchor rod, the inner sleeve 1 does not rotate at this time, and then the conical head 1c of the inner sleeve 1 is taken out from the inner hole of the end of the hollow anchor rod.
And seventhly, constructing the next hollow anchor rod until all the hollow anchor rods are constructed. When the construction of the next hollow anchor rod is carried out, only the grouting joint is connected with the corresponding hollow anchor rod, and the connection of the grouting joint and the grouting pipe is not needed. That is, before grouting of the first hollow anchor rod, the grouting joint and the binding connection of the grouting pipe are needed, and when construction of the other hollow anchor rods, the grouting joint and the binding connection of the grouting pipe are not needed any more, so that the construction efficiency can be improved, loosening of binding positions in repeated binding can be avoided, and only the primary binding is stable.
Claims (3)
1. A hollow anchor rod construction process comprises the following steps:
firstly, lofting anchor rod hole sites;
secondly, drilling holes in the anchor rod holes;
thirdly, installing a hollow anchor rod;
fourthly, connecting the hollow anchor rod with the grouting pipe through a grouting joint;
fifthly, grouting the hollow anchor rod;
sixthly, separating the grouting joint from the end head of the hollow anchor rod;
seventh, constructing the next hollow anchor rod until all hollow anchor rods are constructed;
the method is characterized in that: the hollow anchor rod grouting joint used in the fourth step comprises an inner sleeve (1) and an outer sleeve (2), wherein a limit step (1 a) and a grouting pipe binding groove (1 b) are arranged on the outer wall of the inner sleeve (1) at intervals back and forth, the inner wall of the outer sleeve (2) is sequentially divided into a thread section (2 a), a unthreaded hole section (2 b) and a necking section (2 c), the thread section (2 a) is used for being screwed and fixed with the end thread of a hollow anchor rod, the diameter of the unthreaded hole section (2 b) is larger than that of the thread section (2 a) and the necking section (2 c), the outer sleeve (2) is sleeved on the inner sleeve (1), the limit step (1 a) can slide in the unthreaded hole section (2 b) to realize the back and forth movement of the outer sleeve (2) relative to the inner sleeve (1), the front end of the inner sleeve (1) is provided with a conical head (1 c), and the inner diameter of the hollow anchor rod is between the inner diameter of the conical head (1 c) and the outer diameter of the conical head (1 c) so that the conical head (1 c) can be locally inserted into the hollow anchor rod to realize butt joint sealing;
the outer sleeve (2) of the grouting joint is firstly slid backwards relative to the inner sleeve (1), so that the conical head (1 c) of the inner sleeve (1) is exposed and is partially inserted into an inner hole of the end head of the hollow anchor rod to realize butt joint sealing, and then the outer sleeve (2) is screwed forwards and is locked with the external thread of the hollow anchor rod through the thread section (2 a), so that the grouting joint is connected with the hollow anchor rod; the front end of the grouting pipe is sleeved into the rear end of the inner sleeve (1) and is fixed on a grouting pipe binding groove (1 b) through steel wire binding, so that the grouting joint is connected with the grouting pipe; the connection of the grouting joint and the hollow anchor rod can be performed before the connection of the grouting joint and the grouting pipe or after the connection of the grouting joint and the grouting pipe;
in the fifth step, air in the grouting joint directly flows out from the outer wall of the hollow anchor rod along the inner hole of the hollow anchor rod under the pressure of the grout during grouting until the grout is full to form reverse grout, and grouting is completed;
in the sixth step, when the grouting joint is separated from the end of the hollow anchor rod, the grouting pipe is not required to be taken down from the grouting joint, the outer sleeve (2) is screwed backwards to separate the threaded section (2 a) from the external thread of the hollow anchor rod, at the moment, the inner sleeve (1) does not rotate, and then the conical head (1 c) of the inner sleeve (1) is taken out from the inner hole of the end of the hollow anchor rod;
in the seventh step, when the construction of the next hollow anchor rod is carried out, only the grouting connector is connected with the corresponding hollow anchor rod, and the connection of the grouting connector and the grouting pipe is not needed.
2. The hollow anchor construction process according to claim 1, wherein: the outer sleeve (2) is formed by welding a front section and a rear section, and the welding surface just forms the front end surface of the unthreaded hole section (2 b).
3. The hollow anchor construction process according to claim 2, wherein: the left side and the right side of the outer wall of the outer sleeve (2) are oppositely welded with holding baffle plates (2 d), and welding lines of the holding baffle plates (2 d) are perpendicularly intersected with welding lines of the front section and the rear section of the outer sleeve (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910892949.XA CN110500126B (en) | 2019-09-20 | 2019-09-20 | Grouting joint for hollow anchor rod and construction process for hollow anchor rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910892949.XA CN110500126B (en) | 2019-09-20 | 2019-09-20 | Grouting joint for hollow anchor rod and construction process for hollow anchor rod |
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| Publication Number | Publication Date |
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| CN110500126A CN110500126A (en) | 2019-11-26 |
| CN110500126B true CN110500126B (en) | 2024-03-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910892949.XA Active CN110500126B (en) | 2019-09-20 | 2019-09-20 | Grouting joint for hollow anchor rod and construction process for hollow anchor rod |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111946372B (en) | 2020-07-06 | 2021-06-18 | 青岛市地铁六号线有限公司 | Grouting device for high-coagulability grouting material |
| CN111877566B (en) * | 2020-08-07 | 2021-07-16 | 山东建筑大学 | Microbial grouting anchoring method and structure for grouting in cavity |
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