CN217107071U - Tunnel constraint anchor cable - Google Patents
Tunnel constraint anchor cable Download PDFInfo
- Publication number
- CN217107071U CN217107071U CN202220724407.9U CN202220724407U CN217107071U CN 217107071 U CN217107071 U CN 217107071U CN 202220724407 U CN202220724407 U CN 202220724407U CN 217107071 U CN217107071 U CN 217107071U
- Authority
- CN
- China
- Prior art keywords
- anchor
- tunnel
- steel strand
- connecting piece
- steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Piles And Underground Anchors (AREA)
Abstract
The utility model discloses a tunnel restraint anchor cable, which comprises a steel strand anchored in surrounding rock, a first anchor backing plate and a first anchor device which are arranged on the surface of the surrounding rock, a longitudinal connecting piece arranged between two adjacent steel frames, and a second anchor backing plate and a second anchor device which are arranged on the longitudinal connecting piece; the longitudinal connecting piece is arranged between two adjacent steel frames for preliminary bracing, and a third preformed hole for allowing a steel strand to pass through is formed in the middle of the longitudinal connecting piece; one end of the steel strand is anchored in the deep position of the surrounding rock, and the other end of the steel strand sequentially penetrates through the first preformed hole and the second preformed hole and is locked by the first anchorage device and the second anchorage device respectively. The utility model discloses tunnel restraint anchor cable realizes simultaneously that the initiative of country rock is consolidated and the restraint of steelframe is fixed, has simple, quick, reliable characteristics to the interference to follow-up work progress has been avoided.
Description
Technical Field
The utility model relates to a tunnel engineering field, concretely relates to tunnel restraint anchor cable.
Background
The primary support of the soft rock tunnel is mainly formed by combining a steel frame, sprayed concrete and the like, and the thickness of the primary support is 26-28cm mostly. Compared with the tunnel secondary lining with relatively large thickness and rigidity, the primary support has relatively small thickness and certain flexibility, belongs to a thin-wall arched structure, and has bearing capacity closely related to material strength, structural rigidity and structural stability. Particularly in the construction of a large-span soft rock tunnel, the stability of a primary supporting structure is obviously reduced, instability damage is easy to occur, and the bearing capacity is lost in advance, so that the large deformation disaster of the tunnel is aggravated. In order to prevent the primary supporting structure of the soft rock tunnel from being damaged by instability, the prior art measures include a constraint rod, a stabilizer bar, a constraint anchor rod and the like, which belong to different terms of the same technical measure and can be collectively called as constraint anchor rods, and the so-called constraint anchor rod is a steel pipe, one end of which is anchored in a relatively stable rock stratum in the depth of surrounding rocks by grouting and the other end of which is connected with a tunnel steel frame, so that the steel pipe can constrain the deformation of the primary supporting steel frame, and the stability of the primary supporting structure is improved.
If the restraint anchor rod really plays an effective restraint effect on the tunnel steel frame, three conditions need to be met simultaneously: firstly, the constraint anchoring rod is long enough and can be deeply inserted into a relatively stable rock stratum in the depth of the surrounding rock; secondly, the restrained anchoring rod and the surrounding rock can be effectively anchored, and the restrained anchoring rod is ensured to have enough anchoring force by adopting a proper anchoring mode, increasing the diameter of the restrained anchoring rod and the like; thirdly, the constraint anchoring rods and the tunnel steel frame must be reliably connected. However, from the point of view of practical effects in the field, the prior art measures still have the following obvious drawbacks and disadvantages:
(1) the soft rock tunnel is mainly excavated in a subsection manner by a three-step method, the operation space of the upper step is very limited, the height difference between the soft rock tunnel and the middle step is large, the YT-28 hand-held air drill used in the tunnel is limited in drilling depth and drilling diameter when the anchoring rod is restrained to drill, and if a down-the-hole drill is adopted, a small down-the-hole drill must be selected, but field tests show that the small down-the-hole drill in the tunnel is still inconvenient to place, the drilling operation and the like, the drilling efficiency is very low, and the site construction is not facilitated. Due to the reasons, the length and the diameter of the conventional constraint anchor rod positioned on the upper step of the tunnel are limited, so that the constraint anchor rod is difficult to penetrate through the range of a surrounding rock relaxation area to play an effective anchoring role.
(2) The soft rock tunnel upper step restraint anchor rod adopts the upward inclined drilling, and during grouting anchoring, the problems of slurry leakage and slurry leakage are difficult to effectively solve, so that the grouting anchoring effect of the restraint anchor rod in the depth of surrounding rocks is difficult to ensure, and only the downward inclined drilling is forced to be adopted, so that grouting is facilitated, the bending resistance and the shearing resistance of the rod are exerted to a certain extent, and the axial bearing advantage of the restraint anchor rod and the restraint effect of the restraint anchor rod on the primary support of the tunnel are not favorably exerted.
(3) The restraint anchor rod is welded by means of the contact position with the longitudinal connecting piece, connection of the restraint anchor rod and the steel frame is achieved, welding operation time is long, and reliability of connection of the restraint anchor rod and the steel frame is difficult to guarantee due to the fact that human factors of operating personnel easily affect the restraint anchor rod.
In summary, a series of technical problems which are difficult to solve still exist in the processes of drilling, anchoring, connecting and the like of the restraint anchor rod for improving the stability of the primary support structure of the upper step of the soft rock tunnel at present, and further the expected technical effect of the restraint anchor rod is difficult to realize.
SUMMERY OF THE UTILITY MODEL
To the technical problem, the utility model provides a tunnel restraint anchor cable effectively improves soft rock tunnel preliminary bracing structure's stability.
The utility model adopts the technical scheme as follows:
a tunnel constraint anchor cable comprises steel strands anchored in surrounding rocks, a first anchor backing plate and a first anchor device which are installed on the surfaces of the surrounding rocks, a longitudinal connecting piece installed between two adjacent steel frames, and a second anchor backing plate and a second anchor device which are installed on the longitudinal connecting piece;
the longitudinal connecting piece is arranged between two adjacent steel frames of the primary support, and a third preformed hole through which a steel strand can conveniently pass is formed in the middle of the longitudinal connecting piece;
the middle parts of the first anchor backing plate and the second anchor backing plate are respectively provided with a first preformed hole and a second preformed hole which are matched with the diameter of the steel strand; and one end of the steel strand is anchored in the deep surrounding rock, and the other end of the steel strand sequentially passes through the first preformed hole and the second preformed hole and is locked by the first anchorage device and the second anchorage device respectively for applying pre-tightening force to the steel strand.
In the tunnel constraint anchor cable, two ends of the longitudinal connecting piece are tightly attached to the inner side of the flange of the steel frame close to one side of the surrounding rock and are welded and fixed.
In the tunnel constraint anchor cable, the length of the steel strand is 5-12m, the diameter is 17-25mm, and 4-8 steel frames are arranged between every two steel frames.
In the tunnel constraint anchor cable, the longitudinal connecting piece is made of I14 or I16I-shaped steel, and the length of the longitudinal connecting piece is 6-8cm smaller than the distance between adjacent steel frames.
In the tunnel constraint anchor cable, the length, width and thickness of the first anchor backing plate are respectively 28-32cm, 28-32cm and 14-16mm, the first preformed hole is a circular hole, and the aperture is 4-6mm larger than the diameter of the steel strand.
In the tunnel constraint anchor cable, the length, width and thickness of the second anchor backing plate are respectively 14-16cm, 10-12cm and 14-16mm, the second preformed hole is a circular hole, and the aperture is 4-6mm larger than the diameter of the steel strand.
In the tunnel constraint anchor cable, the third preformed hole is a long hole arranged along the length direction of the longitudinal connecting piece.
In the tunnel constraint anchoring cable, the first anchorage device and the second anchorage device are matched with the diameter of the steel strand.
The method for improving the stability of the primary support structure by utilizing the tunnel constraint anchor cables comprises the following steps:
【1】 Drilling:
primarily spraying concrete on the surrounding rock surface after the tunnel is excavated;
drilling holes with diameter of 28-32mm and depth of 5-12m at the position between two steel frames and at a distance of 0.8-1.2m from arch springing;
【2】 Resin anchoring agent installation:
after the holes are drilled and cleaned, the resin anchoring agent cartridge is conveyed into a specified position of the drilled hole by a plastic pipe, and then the resin anchoring agent in the drilled hole is tamped, wherein the cumulative length of the resin anchoring agent cartridge is 1.2-1.8 m;
【3】 Steel strand manhole and anchoring agent stirring and anchoring:
after the steel strand is manually fed into a drilled hole to the position where the resin anchoring agent is located, a stirring driver is arranged at the lower end of the steel strand, a drilling machine drives the stirring driver and the steel strand to rotate, a resin anchoring agent cartridge is stirred, the drilling machine is kept to advance, the stirring time is controlled to be 20-30s, and the length of the support surface of the steel strand at the initial stage of exposure is controlled to be 25-30 cm;
【4】 Applying pretightening force to the steel strand on the surface of the surrounding rock:
(4.1) after stirring the resin anchoring agent cartridge for 10-15min, sequentially installing a first anchor backing plate and a first anchor on the surface of the surrounding rock;
applying pretightening force to the steel strand by using a tensioning machine, and locking the steel strand for the first time by using a first anchorage device to realize active reinforcement of a restraining and anchoring cable support system to the surrounding rock;
【5】 The steel strand is connected with the steel frame:
(5.1) erecting steel frames according to the set intervals;
installing a longitudinal connecting piece, enabling the steel strand to pass through a third reserved hole, then tightly attaching two ends of the longitudinal connecting piece to flanges of the steel frame on the side close to the surrounding rock, and welding contact positions of the two;
a second anchor backing plate and a second anchor are sequentially installed, a tensioning machine is used for applying pretightening force to the steel strand again, the second anchor locks the steel strand for the second time, the tunnel constraint anchor cable is used for constraining and fixing the steel frame, and the pretightening force is 6-10 kN;
(5.4) cutting off the redundant exposed parts of the steel strands by using an angle grinder;
【6】 And spraying the concrete again to the designed thickness.
The method for improving the stability of the primary support structure comprises the following steps: and (1) drilling holes by adopting a single pneumatic anchor rod drilling machine, a hollow hexagonal extension type drill rod and a matched drill bit.
The utility model has the advantages of as follows:
(1) the utility model discloses a major diameter steel pipe that minor diameter steel strand wires replaced restraint anchor rod to adopt, this technical measure of tunnel restraint anchor cable is proposed, in order to improve tunnel primary support structural stability, minor diameter steel strand wires have certain flexibility, its installation length does not receive tunnel construction operation space restriction, wherein the required drilling of steel strand wires installation adopts monomer formula pneumatic roofbolter to drill, join in marriage long drilling rod, drilling depth can reach more than 12m, ensure that restraint anchor cable can go deep into to the more stable stratum of country rock depths, and drilling efficiency is high, avoided receiving tunnel bench construction operation space restriction, the manual pneumatic drill drilling depth of YT-28 that the tunnel is commonly used is limited and down-the-hole drill drilling operation is inconvenient, the scheduling problem of inefficiency.
(2) The utility model discloses steel strand wires in tunnel restraint anchor cable and country rock pass through the resin anchoring agent and anchor, can obtain the anchor power fast, and avoided the slip casting anchor production on the restraint anchor pole slant completely, leak the thick liquid problem to can ensure the anchor effect, restraint anchor cable can be installed on the perpendicular country rock surface of tunnel arch (slant) simultaneously, can give full play to steel strand wires's tensile property, steel strand wires tensile strength can reach 1860MPa above.
(3) The utility model discloses tunnel restraint anchor cable exerts the pretightning force to the steel strand wires at the surrounding rock surface with the help of stretch-draw machines, locks the steel strand wires by the ground tackle of installing on the surrounding rock surface for the first time, realizes restraint anchor cable support system to the initiative reinforcement of surrounding rock, and restraint anchor rod does not have this technological effect; in addition, the tensioning machine is used for exerting pretightening force on the steel strand on the surface of the longitudinal connecting piece again, the anchorage device arranged on the longitudinal connecting piece is used for locking the steel strand for the second time, the restraint fixing of the restraint anchor cable supporting system to the steel frame is realized, and the connection mode of the restraint anchor cable and the steel frame is simpler, quicker and more reliable.
(4) The utility model discloses the one end anchor of tunnel restraint anchor cable is in the more stable stratum of country rock depths, and the other end is connected with the preliminary bracing steelframe, has strengthened the constraint effect to preliminary bracing structure, when improving preliminary bracing structure and resisting self unstability destructive power, can also subside and the convergence deformation plays the inhibitory action to preliminary bracing structure is whole, and need not to set up interim invert or interim stull, has accomplished "to prop with the cable, has avoided the interference to follow-up work progress.
Drawings
Fig. 1 is a schematic layout view of a tunnel restraining anchor cable support system according to an embodiment of the present invention;
fig. 2 is the utility model discloses an embodiment's three-dimensional schematic diagram of tunnel restraint anchor cable supporting system.
Fig. 3 is a schematic view of a longitudinal connecting member in an embodiment of the present invention.
Fig. 4 is a schematic view of a first anchor pad in an embodiment of the present invention.
Fig. 5 is a schematic view of a second anchor pad according to an embodiment of the present invention.
Reference numerals: 1-steel strand; 2-a first anchor backing plate; 3-a first anchorage; 4-steel frame; 5-longitudinal connecting piece; 6-a second anchor backing plate; 7-a second anchorage; 8-a third preformed hole; 9-a first preformed hole; 10-second preformed hole.
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 merely illustrative of the invention and are not intended to limit the invention.
On the contrary, the invention is intended to cover alternatives, modifications, equivalents and alternatives which may be included within the spirit and scope of the invention as defined by the appended claims. Furthermore, in order to provide a better understanding of the present invention to the public, certain specific details are set forth in the following detailed description of the invention. It will be apparent to those skilled in the art that the present invention may be practiced without these specific details.
As shown in fig. 1-2, the utility model discloses use the construction of the restraint anchor cable of setting at the tunnel upper step as the example, introduce the utility model discloses a concrete technical scheme:
a tunnel constraint anchor cable comprises a steel strand 1 anchored in surrounding rock, a first anchor backing plate 2, a first anchor 3, a longitudinal connecting piece 5, a second anchor backing plate 6 and a second anchor 7, wherein the first anchor backing plate 2 and the first anchor 3 are installed on the surface of the surrounding rock, the longitudinal connecting piece 5 is installed between two adjacent steel frames 4, and the second anchor backing plate 6 and the second anchor 7 are installed on the longitudinal connecting piece 5.
The longitudinal connecting pieces 5 are arranged between two adjacent steel frames 4 of the primary support, two ends of each longitudinal connecting piece are tightly attached to the inner sides of the steel frame flanges close to one side of the surrounding rock and welded, and each longitudinal connecting piece 5 is provided with a third preformed hole 8 through which a steel strand can conveniently pass;
as shown in fig. 3-5, a first preformed hole 9 and a second preformed hole 10 matched with the diameter of the steel strand 1 are respectively arranged in the middle of the first anchor backing plate 2 and the second anchor backing plate 6, and both the first preformed hole 9 and the second preformed hole 10 are round holes. The third preformed hole 8 is a long hole arranged along the length direction of the longitudinal connecting piece 5, and the length of the long hole is 15-20cm, so that the longitudinal connecting piece 5 can be conveniently installed.
One end of the steel strand 1 is anchored in the deep surrounding rock, the other end (exposed end) firstly passes through the first preformed hole 9, and the first anchorage device 3 is used for locking the steel strand 1 subjected to pretightening force for the first time; and then the steel strand 1 which is subjected to pretightening force is locked for the second time by a second anchorage device 7 arranged on the longitudinal connecting piece after passing through a second preformed hole 10.
The length of the steel strand 1 is 10m, the diameter is 21.8mm, and 4 steel frames are arranged between every two steel frames on the upper step of the tunnel. The longitudinal connecting piece 5 is made of I16I-shaped steel, and the length of the longitudinal connecting piece is smaller than the design interval of a steel frame by 6 cm.
The length, the width and the thickness of the first anchor backing plate 2 are respectively 30cm, 30cm and 16mm, and the central aperture of the first anchor backing plate 2 is larger than the diameter of the steel strand 1 by 5 mm. The length, width and thickness of the second anchor backing plate 6 are respectively 16cm, 12cm and 16mm, and the central aperture of the second anchor backing plate 6 is larger than the diameter of the steel strand 1 by 5 mm. The first anchorage device 3 and the second anchorage device 7 are both matched with the diameter of the steel strand.
The utility model discloses utilize tunnel restraint anchor cable to improve primary support structure stability's method, including following step:
【1】 Drilling:
[ 1.1 ] after the tunnel upper step is excavated, the concrete is sprayed on the rock surface initially immediately, and the influence of vault chipping on the drilling construction of the constraint anchoring cable is reduced.
Marking the position of a restraining anchoring cable drill hole on the surface of a surrounding rock along the annular direction of the tunnel between two steel trusses 4 to be installed on the upper step of the tunnel, and ensuring that the drill hole is positioned in the middle position of two adjacent steel trusses so as to facilitate the installation of a longitudinal connecting piece 5; the specific position of the drill hole along the circumferential direction of the tunnel is comprehensively determined by considering the quantity of the constraint anchor cables, the surrounding rock condition and the position of the steel frame connecting plate; wherein, the constraint anchoring cable drill holes close to the arch springs at the two sides of the tunnel upper step are arranged at the position 1.2m above the arch springs.
And (1.3) drilling holes on the vertical surrounding rock surface at the marked drilling hole position by adopting a single pneumatic roofbolter, a hollow hexagonal extension type drill rod and a phi 32mm drill bit.
[ 1.4 ] the drilling depth is comprehensively determined according to the tunnel overexcavation condition and the exposed length requirement of the steel strand 1, so that the steel strand 1 and the longitudinal connecting piece 5 can be effectively connected.
【2】 Resin anchoring agent installation:
[ 2.1 ] A steel strand 1 in the restraint anchor cable support system is anchored by adopting the end of a resin anchoring agent, and before a resin anchoring agent cartridge is sent into a drilled hole, the drilled hole is cleaned.
[ 2.2 ] the resin anchoring agent cartridge is conveyed into a drilling hole through a plastic pipe to be positioned, and then the resin anchoring agent in the drilling hole is tamped.
[ 2.3 ] the cumulative length of the resin anchoring agent medicated roll is not smaller than the designed length of the anchoring section of the restraining anchoring rope, and is 1.2-1.8 m.
【3】 And (3) entering the steel strand 1 into a hole and stirring and anchoring by using an anchoring agent:
[ 3.1 ] adopt the manual work to send into steel strand wires 1 and drill to the resin anchoring agent position after, steel strand wires 1 lower extreme installs the stirring driver, drives stirring driver and steel strand wires by the rig and rotates, stirs the resin anchoring agent batch roll.
(3.2) keeping a drilling machine to be pushed while stirring the resin anchoring agent, and controlling the stirring time to be 20-30s to ensure that the anchoring agent is uniformly stirred.
3.3, during the process of propelling the steel strand 1 by the drilling machine, the final exposed length of the steel strand 1 is not too short or too long, and the final exposed length exceeds the primary support surface by 25 cm.
【4】 Applying pretightening force to the steel strand 1 on the surface of the surrounding rock:
(4.1) after the resin anchoring agent cartridge is stirred for 10-15min, a first anchor backing plate 2 and a first anchor device 3 on the surface of the surrounding rock are sequentially installed.
[ 4.2 ] a tensioning machine is adopted to apply pretightening force to the steel strand 1, the pretightening force is applied in place once, then the first anchorage device 3 installed on the surface of the surrounding rock is used for locking the steel strand 1 for the first time, and the active reinforcement of the confined anchoring cable support system to the surrounding rock is realized.
【5】 The steel strand 1 is connected with the steel frame:
after pretightening force is applied to the surface of the surrounding rock by the steel strand 1, steel frames are erected in time, and the space between the steel frames strictly meets the design requirements.
(5.2) installing a longitudinal connecting piece 5: and (3) enabling the steel strand 1 to penetrate through a third preformed hole 8 on the longitudinal connecting piece 5, then enabling two ends of the longitudinal connecting piece 5 to be tightly attached to the flange of the steel frame on one side close to the surrounding rock, and welding the contact position of the two.
And (5.3) sequentially installing a second anchor backing plate 6 and a second anchor 7 on the longitudinal connecting piece 5, then applying pretightening force to the steel strand 1 again by adopting a tensioning machine, and locking the steel strand 1 for the second time by using the second anchor 7 installed on the longitudinal connecting piece to realize the restraint and fixation of the restraint anchor cable supporting system on the steel frame, wherein the pretightening force is controlled within 6-10kN at this time to avoid the steel frame from being pulled and shifted.
(5.4) cutting off the redundant exposed parts of the steel strand by using an angle grinder, and preferably, exposing the steel strand 1 to 5cm of a second anchorage device arranged on the longitudinal connecting piece 5.
【6】 And (5) re-spraying concrete on the rock surface to the designed thickness to complete the construction operation of primary support.
The utility model discloses a major diameter steel pipe that minor diameter steel strand wires replaced restraint anchor rod to adopt, this technical measure of tunnel restraint anchor rope is proposed, in order to improve tunnel primary support structural stability, wherein the required drilling of steel strand wires installation adopts the pneumatic roofbolter of monomer formula to drill, join in marriage and connect long formula drilling rod, the drilling depth can reach more than 12m, ensure that restraint anchor rope can go deep into to the more stable stratum of country rock depths on, and drilling efficiency is high, avoided receiving the restriction of tunnel bench construction operation space, the tunnel is often used handheld pneumatic drill drilling depth limit and down-the-hole drill drilling operation inconvenience, the inefficiency scheduling problem.
The utility model discloses steel strand wires in tunnel restraint anchor cable and country rock pass through the resin anchoring agent and anchor, can obtain the anchor power fast, and avoided the slip casting anchor production on the restraint anchor pole slant completely, leak the thick liquid problem to can ensure the anchor effect, restraint anchor cable can be installed on the perpendicular country rock surface of tunnel arch (slant) simultaneously, can give full play to steel strand wires's tensile property, steel strand wires tensile strength can reach 1860MPa above.
The utility model discloses tunnel restraint anchor cable exerts the pretightning force to the steel strand wires at the country rock surface with the help of stretch-draw machines, locks the steel strand wires by installing first ground tackle 3 on the country rock surface for the first time, realizes restraint anchor cable support system to the initiative reinforcement of country rock, and restraint anchor rod does not have this technological effect; in addition, the tensioning machine is used for exerting pretightening force on the steel strand on the surface of the longitudinal connecting piece again, the second anchorage device 7 installed on the longitudinal connecting piece is used for locking the steel strand for the second time, the restraint fixing of the restraint anchor cable supporting system on the steel frame is achieved, and the connection mode of the restraint anchor cable and the steel frame is simpler, quicker and more reliable.
The utility model discloses the one end anchor of tunnel restraint anchor cable is in the more stable stratum of country rock depths, and the other end is connected with the preliminary bracing steelframe, has strengthened the constraint effect to preliminary bracing structure, when improving preliminary bracing structure and resisting self unstability destructibility ability, can also subside and convergent deformation to preliminary bracing structure wholly and play the inhibitory action, and need not to set up interim invert or interim stull, accomplished "prop with the cable, avoided the interference to follow-up work progress.
To sum up, the utility model discloses a method of tunnel restraint anchor cable and improvement primary support structure stability can satisfy 3 conditions that effective restraint must satisfy to the tunnel steelframe realization simultaneously: firstly, the constraint anchoring cable is long enough and can penetrate into a relatively stable rock stratum deep in the surrounding rock; secondly, the constraint anchoring cable and the surrounding rock can realize quick and effective anchoring, and the constraint anchoring cable is ensured to have enough anchoring force; thirdly, the constraint anchoring cables are reliably connected with the tunnel steel frame. Furthermore, the technical effect of the restraint anchor cable support system is guaranteed, and the stability of the primary support structure of the soft rock tunnel can be effectively improved. Meanwhile, the method can also play a role in inhibiting the overall settlement and convergence deformation of the primary support structure.
The above contents are only for explaining the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby, and any modification made on the basis of the technical solution according to the technical idea of the present invention all fall within the protection scope of the claims of the present invention.
Claims (8)
1. A tunnel restraint anchor rope which characterized in that: the steel strand anchor comprises a steel strand (1) anchored in surrounding rock, a first anchor backing plate (2) and a first anchor (3) which are arranged on the surface of the surrounding rock, a longitudinal connecting piece (5) arranged between two adjacent steel frames (4), and a second anchor backing plate (6) and a second anchor (7) which are arranged on the longitudinal connecting piece (5);
the longitudinal connecting piece (5) is arranged between two adjacent steel frames (4) of the primary support, and a third preformed hole (8) through which the steel strand (1) can conveniently pass is formed in the middle of the longitudinal connecting piece (5);
the middle parts of the first anchor backing plate (2) and the second anchor backing plate (6) are respectively provided with a first preformed hole (9) and a second preformed hole (10) which are matched with the diameter of the steel strand (1); steel strand wires (1) one end anchor in country rock depths, the other end passes first preformed hole (9) and second preformed hole (10) in proper order to lock steel strand wires (1) of exerting the pretightning force by first ground tackle (3) and second ground tackle (7) respectively.
2. The tunnel-constraining anchor line of claim 1, wherein: two ends of the longitudinal connecting piece (5) are tightly attached to the inner side of the flange of the steel frame (4) close to one side of the surrounding rock and are welded and fixed.
3. The tunnel-constraining anchor line of claim 1, wherein: the length of the steel strand is 5-12m, the diameter is 17-25mm, and 4-8 steel frames are arranged between every two steel frames.
4. The tunnel-constraining anchor line of claim 1, wherein: the longitudinal connecting piece adopts I14 or I16I-shaped steel, and the length is 6-8cm smaller than the distance between adjacent steel frames.
5. The tunnel-constraining anchor line of claim 1, wherein: the length, the width and the thickness of the first anchor backing plate (2) are respectively 28-32cm, 28-32cm and 14-16mm, the first preformed hole (9) is a round hole, and the aperture is 4-6mm larger than the diameter of the steel strand.
6. The tunnel-constraining anchor line of claim 1, wherein: the length, the width and the thickness of the second anchor backing plate (6) are 14-16cm, 10-12cm and 14-16mm respectively, the second preformed hole (10) is a round hole, and the aperture is 4-6mm larger than the diameter of the steel strand.
7. The tunnel-constraining anchor line of claim 1, wherein: the third preformed hole (8) is a long hole arranged along the length direction of the longitudinal connecting piece (5).
8. The tunnel-constraining anchor line of claim 1, wherein: the first anchorage device (3) and the second anchorage device (7) are both matched with the diameter of the steel strand (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220724407.9U CN217107071U (en) | 2022-03-30 | 2022-03-30 | Tunnel constraint anchor cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220724407.9U CN217107071U (en) | 2022-03-30 | 2022-03-30 | Tunnel constraint anchor cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217107071U true CN217107071U (en) | 2022-08-02 |
Family
ID=82577672
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220724407.9U Active CN217107071U (en) | 2022-03-30 | 2022-03-30 | Tunnel constraint anchor cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217107071U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023185301A1 (en) * | 2022-03-30 | 2023-10-05 | 长安大学 | Tunnel constraint anchor cable and method for improving stability of initial support structure |
-
2022
- 2022-03-30 CN CN202220724407.9U patent/CN217107071U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023185301A1 (en) * | 2022-03-30 | 2023-10-05 | 长安大学 | Tunnel constraint anchor cable and method for improving stability of initial support structure |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100740200B1 (en) | Tunnelling method using pre-support concept and an adjustable apparatus thereof | |
| KR101671123B1 (en) | Tunnel construction method by using pre-support and post-support, and suitable device therefor | |
| CN105040712B (en) | A kind of soft or hard crushes mutual laminar composite rock matter side slope high pressure rinse and plants anchor recharge comprehensive ecological safeguard structure and its construction method | |
| CN106498950A (en) | Anchor head is placed in the Pile-Anchor Supporting for Deep Excavation system and its implementation of pile body | |
| CN109930609A (en) | A kind of campshed composite supporting construction and its construction method for upper-soft lower-hard ground | |
| CN111560962A (en) | Backfill area foundation pit supporting structure and construction method thereof | |
| CN217107071U (en) | Tunnel constraint anchor cable | |
| CN113090284A (en) | Roadway support method for soft and broken rock mass of underground mine | |
| WO2019009822A1 (en) | Umbrella anchorage | |
| CN110616740A (en) | Structure for expanding subway section in subway mine method construction interval and construction method thereof | |
| CN108914945A (en) | A kind of deep basal pit pile for prestressed pipe, prestress anchorage cable combined supporting construction method | |
| CN206408630U (en) | Anchor head is placed in the Pile-Anchor Supporting for Deep Excavation system of pile body | |
| WO2023185301A1 (en) | Tunnel constraint anchor cable and method for improving stability of initial support structure | |
| CN104863613B (en) | Rocky stratum tunneling underground structure flash joist anchor draws just branch structure and construction method | |
| CN113529756A (en) | Slope emergency support device and method | |
| CN106638625B (en) | After a kind of failure of prestressd anchor cable can tensioning again construction method | |
| CN216041225U (en) | Slope emergency support device | |
| CN115717397A (en) | Larsen steel sheet pile and prestressed anchor cable combined supporting construction method | |
| CN205662920U (en) | Take secret assembled precast pile in anchor rope hole | |
| CN115095357A (en) | Built-in pipe shed supporting device and direct construction method of pipe shed in tunnel | |
| KR100895770B1 (en) | Inner member additional reinforcement assembly for preventing ground collapse and its construction method to be used therefor | |
| CN105586976A (en) | Method for carrying out foundation pit slope support by virtue of slope-ratio method as well as mixing piles and pre-stressed anchor cables | |
| CN113417646A (en) | Large-section tunnel supporting structure suitable for Xigeda stratum and construction method | |
| CN207891914U (en) | Shallow-depth-excavation tunnel hole inner termination wall piled anchor one supporting construction | |
| CN207553108U (en) | Geotechnical engineering safety protective device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |