CN117626800A - Replaceable anchoring structure for U-shaped tunnel anchor and construction method - Google Patents
Replaceable anchoring structure for U-shaped tunnel anchor and construction method Download PDFInfo
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- CN117626800A CN117626800A CN202311702358.4A CN202311702358A CN117626800A CN 117626800 A CN117626800 A CN 117626800A CN 202311702358 A CN202311702358 A CN 202311702358A CN 117626800 A CN117626800 A CN 117626800A
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- 238000004873 anchoring Methods 0.000 title claims abstract description 44
- 238000010276 construction Methods 0.000 title claims abstract description 21
- 239000011435 rock Substances 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims description 14
- 230000008569 process Effects 0.000 claims description 13
- 230000001681 protective effect Effects 0.000 claims description 10
- 230000007246 mechanism Effects 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 4
- 239000004917 carbon fiber Substances 0.000 claims description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims 2
- 238000010168 coupling process Methods 0.000 claims 2
- 238000005859 coupling reaction Methods 0.000 claims 2
- 230000001105 regulatory effect Effects 0.000 claims 2
- 239000000725 suspension Substances 0.000 abstract description 7
- 238000003466 welding Methods 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 241001122767 Theaceae Species 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 210000002435 tendon Anatomy 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/14—Towers; Anchors ; Connection of cables to bridge parts; Saddle supports
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D11/00—Suspension or cable-stayed bridges
- E01D11/02—Suspension bridges
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- Engineering & Computer Science (AREA)
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- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a replaceable anchoring structure for a U-shaped tunnel anchor and a construction method, belongs to the technical field of suspension bridge anchoring, and solves the technical problem that no corresponding anchoring system is matched with the U-shaped tunnel anchor at present. The invention can anchor the main cable strands of the left and right front anchor chambers of the anchorage through the U-shaped anchor unit, has simple anchor structure and definite and reliable stress, provides good stress characteristics for the original rock mass, and has good durability of the prestressed cable of the anchor unit, and can be monitored and replaced.
Description
Technical Field
The invention relates to the technical field of suspension bridge anchoring, in particular to a replaceable anchoring structure for a U-shaped tunnel anchor and a construction method.
Background
The anchorage is a large structural body for anchoring a main cable of a suspension bridge and bearing the load of the main cable, and the main cable anchorage of the current suspension bridge mainly has three types: gravity anchors, as shown in fig. 1; tunnel anchors, as shown in fig. 2; a rock anchor as shown in figure 3. The tunnel type anchorage is suitable for working conditions of good rock mass, less excavation and less influence on environment requirements, the anchor plug body of the tunnel anchor is combined with the rock mass into a whole, and the main cable tension is borne by the shearing resistance of the rock mass.
Tunnel anchors are often adopted for large suspension bridges in mountain canyons, such as a tea hole bank anchor in a large bridge in Hunan dwarf village, a West anchor in a large bridge in a Guizhou dam, a Jinsha river extra large bridge anchor in a Yunnan Lixiang railway, a Yunnan Jin Anjin Sha Jiangda bridge anchor, a Jiangchang mountain Changjiang large bridge northwest anchor, a Chuan Yunnan Jinsha river extra large bridge Ningnan bank anchor, a six branch bank anchor in a large bridge in a Guizhou Huajiang canyon, a new-built Sichuan railway large-ferry river extra large bridge anchor and the like. The anchorage of each shore is provided with two independent anchors, and each anchor is anchored with a main cable.
The anchorage anchoring system (structure) is a structure which is connected with a cable strand anchor head through a prestressed tendon anchor assembly and a pull rod assembly and transmits a tensile load from a main cable to an anchor body, and is a 'life line engineering' of a suspension bridge, as shown in fig. 4. With the development of prestressing, anchorage anchoring structures currently mainly take two forms: adhesive non-replaceable anchor structures and adhesive-free replaceable anchor structures. For a common tunnel anchor, a rear anchor chamber is required to be arranged at the rear end of each anchor body so as to facilitate the construction of an anchor structure.
The geological conditions of the suspension bridge anchorage are quite different, some areas have extremely complex terrains, geology, climate and ecology, the earthquake intensity is high, the construction is extremely difficult, and the scientific and reasonable design is the primary key. For the extremely complex working conditions with poor geological conditions, the most suitable anchorage is a tunnel anchor, however, the common tunnel anchor is sometimes difficult to meet engineering design requirements, and a new tunnel anchor structure is required to be adopted.
Through analysis, calculation and research, the U-shaped tunnel anchor is the most suitable novel structure, and a U-shaped anchor body A is added at the rear end on the basis of a common tunnel anchor, and the U-shaped anchor body A connects two independent linear anchor bodies into a whole, as shown in fig. 5, and the pull-out resistance of the U-shaped tunnel anchor is greatly superior to that of the linear tunnel anchor.
For such U-shaped tunnel anchors, there is currently no corresponding anchoring system match, and existing anchoring systems (as shown in fig. 4) are only suitable for linear anchors and are not suitable for U-shaped tunnel anchors. There is a need for a U-shaped tunnel anchor that matches the new U-shaped tunnel anchor with a replaceable anchor structure and method of construction.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art, and the first aim of the invention is to provide a replaceable anchoring structure for a U-shaped tunnel anchor.
The invention further provides a construction method of the replaceable anchoring structure for the U-shaped tunnel anchor.
In order to achieve the first object, the invention provides a replaceable anchoring structure for a U-shaped tunnel anchor, which comprises anchoring units which are equal to the number of main cable strands and correspond to each other one by one, wherein each anchoring unit comprises at least one U-shaped pipe which is positioned in a rock body, two ends of each U-shaped pipe are respectively provided with an under-anchor embedded part, an anchor plug body is arranged between each U-shaped pipe and the rock body, the under-anchor embedded parts on two sides are embedded by the anchor plug body, the under-anchor embedded parts on two sides are respectively and correspondingly connected with the main cable strands on two sides of a bridge through cable strand connecting mechanisms, prestressed cables are arranged in each U-shaped pipe, and two ends of each prestressed cable are respectively anchored with the cable strand connecting mechanisms on two sides.
As a further improvement, a plurality of the anchoring units are arranged in a top-bottom sequence or in a horizontal nested arrangement.
Further, the cable strand connecting mechanism comprises a pull rod, a nut component and a connector, wherein the connector is connected with the embedded part under the anchor, the prestressed cable is anchored with the connector through a cable body anchorage device, and the pull rod penetrates through the connector and the cable strand anchor head of the main cable strand and is locked through the nut component.
Further, the connector is provided with an anchor head protection cover covering the extending end of the prestressed cable.
Further, the number of the U-shaped pipes is 2-7, and the U-shaped pipes are independently arranged in parallel.
Further, the number of the U-shaped pipes is optimally 3-4.
Further, the prestress rope comprises at least one of a steel strand finished rope, a steel wire finished rope and a carbon fiber finished rope.
Further, a gap exists between the U-shaped pipe and the prestress rope.
Further, the U-shaped pipe comprises a bent embedded pipe, the two ends of the bent embedded pipe are connected with direct embedded pipes, and the bent embedded pipe and the direct embedded pipes at the two ends form a U-shaped structure.
In order to achieve the second purpose, the invention provides a construction method of a replaceable anchoring structure for a U-shaped tunnel anchor, which comprises a construction process and a prestressed cable replacement process;
the construction process comprises the following steps:
step 11, excavating a U-shaped tunnel in the rock mass, installing a U-shaped pipe and an anchor embedded part in the U-shaped tunnel, and pouring an anchor plug body into the U-shaped tunnel;
step 12, installing a connector on the end face of the embedded part under the anchor;
step 13, penetrating the prestressed cable into the U-shaped pipe, wherein the anchor heads of the cable bodies at the two ends are respectively positioned at the connectors at the two ends;
step 14, stretching and anchoring the prestressed cable to anchor the cable body anchor head to the end face of the connector;
step 15, installing an anchor head protective cover to protect the anchor head of the cable body and the prestressed cable;
step 16, a pull rod penetrates through the connector and the cable strand anchor head of the main cable strand, a nut assembly is installed, and the line type of the main cable strand is adjusted through adjusting the nut assembly;
the prestressed cable replacement process comprises the following steps:
step 21, removing the anchor head protective cover;
step 22, tensioning and unloading prestress at one end of the old prestress cable;
step 23, withdrawing the old pre-stressing rope from one end, and simultaneously taking the traction rope from the other end of the old pre-stressing rope;
step 24, connecting the index rope with the end part of the new pre-stress rope, and pulling the new pre-stress rope into the U-shaped pipe;
step 25, tensioning and anchoring the new prestressed cable;
and 26, installing an anchor head protective cover.
Advantageous effects
Compared with the prior art, the invention has the advantages that:
1. the invention can anchor the main cable strands of the left and right front anchor chambers of the anchorage through one U-shaped anchor unit, has simple anchor structure and definite and reliable stress, and provides good stress characteristics for the original rock mass.
2. The U-shaped pipe is designed in an independent isolation way, is convenient to lengthen during construction, and is convenient for the prestressed cable to penetrate and independently bear force; and a gap exists between the inner cavity of the U-shaped pipe and the prestress rope, the anti-corrosion material is not poured into the inner cavity of the U-shaped pipe, and the prestress rope can be monitored and replaced.
Drawings
FIG. 1 is a schematic structural view of a gravity anchor;
FIG. 2 is a schematic diagram of a construction of a conventional tunnel anchor;
FIG. 3 is a schematic structural view of a rock anchor;
FIG. 4 is a schematic diagram of the structure of a conventional anchorage system;
FIG. 5 is a schematic view of a conventional U-shaped anchor;
FIG. 6 is a schematic top view of the present invention;
FIG. 7 is a schematic left-hand view of the present invention;
FIG. 8 is a partial enlargement of FIG. 7;
fig. 9 is a cross-sectional view of the U-shaped tube at A-A of fig. 7.
Wherein: 1-main cable strand, 2-anchoring unit, 3-rock mass, 4-U-shaped pipe, 41-bent embedded pipe, 42-direct embedded pipe, 5-under-anchor embedded part, 6-anchor plug body, 7-prestressed cable, 8-pull rod, 9-nut component, 10-connector, 11-cable body anchor, 12-cable strand anchor head and 13-anchor head protective cover.
Detailed Description
The invention will be further described with reference to specific embodiments in the drawings.
Referring to fig. 6 to 9, a replaceable anchoring structure for U-shaped tunnel anchors includes anchoring units 2 equal in number and corresponding to main cable strands 1 one by one, and if each main cable is composed of 352 main cable strands 1, the number of the anchoring units 2 is 352. The plurality of anchor units 2 are arranged in sequence or are arranged in a horizontal nested manner. The anchoring unit 2 comprises at least one U-shaped pipe 4,U pipe 4 positioned in the rock mass 3, two ends of the U-shaped pipe 4,U pipe 4 are respectively provided with an under-anchor embedded part 5, an anchor plug body 6 (the anchor plug body 6 is formed by pouring concrete generally) is arranged between the U-shaped pipe 4 and the rock mass 3, namely all the anchoring units 2 (such as 352) are positioned in the anchor plug body 6, the under-anchor embedded part 5 is embedded by the anchor plug body 6, and the end face of the anchor plug body 6 is a front anchor chamber. The anchor embedded parts 5 at two sides are correspondingly connected with the main cable strands 1 at two sides of the bridge through cable strand connecting mechanisms respectively, namely, the anchor embedded parts 5 at one side of the U-shaped pipe 4 are connected with the main cable strands 1 at one side of the bridge, and the anchor embedded parts 5 at the other side of the U-shaped pipe 4 are connected with the main cable strands 1 at the other side of the bridge. The U-shaped pipe 4 is internally provided with a pre-stress cable 7, and after the pre-stress cable 7 is stretched to a set value, the two ends of the pre-stress cable 7 are respectively anchored with cable strand connecting mechanisms at the two sides.
As shown in fig. 6 and 7, the 4 anchor units 2 are arranged in a top-bottom order and in a horizontal nested arrangement, that is, the 2 anchor units 2 are firstly arranged in a horizontal nested arrangement, the smaller the size of the anchor unit 2 closer to the rock mass 3 is, the larger the size of the anchor unit 2 farther from the rock mass 3 is, and then the 2 anchor units 2 are arranged in a top-bottom order to fully utilize the space layout. When the number of the anchor units 2 is large, a plurality of anchor units 2 may be arranged in a horizontal nested manner, and then a plurality of anchor units 2 may be arranged in a top-bottom order.
Preferably, the anchor plug body 6 is also in a U-shaped structure, the size of the rear end of the anchor plug body 6 is larger than that of the front end, and one end, close to the under-anchor embedded part 5, is the front end so as to improve acting force between the whole U-shaped tunnel anchor and the rock mass.
As shown in fig. 6, compared with the structure of the existing independent tunnel anchor, the anchor plug body 6 with the U-shaped structure in the invention tightly pushes up the rock mass 3 in the middle, the stress area is larger (the distance between the left and right front anchor chambers is the distance between the main cable strands 1 on two sides of a bridge, generally more than 25 m), the main cable strands 1 of the left and right front anchor chambers of the anchor can be anchored simultaneously by one U-shaped anchor unit 2, the anchor structure is simple, the stress is clear and reliable, and good stress characteristics can be provided for the original rock mass.
In the embodiment, the cable strand connecting mechanism comprises a pull rod 8, a nut assembly 9 and a connector 10, wherein the connector 10 is connected with the under-anchor embedded part 5, the prestressed cable 7 is anchored with the connector 10 through a cable body anchor 11, and the pull rod 8 passes through the connector 10 and a cable strand anchor head 12 of the main cable strand 1 and is locked through the nut assembly 9.
Specifically, external threads are respectively arranged at two ends of the pull rod 8, and after the two ends of the pull rod 8 respectively pass through the connector 10 and the cable strand anchor head 12 of the main cable strand 1, the nut assemblies 9 are respectively screwed into the two ends of the pull rod 8. The nut assembly 9 consists of a nut and a resilient washer, or the nut assembly 9 consists of a double nut.
Of course, the pull rod 8 may have a baffle at one end and an external thread at the other end, and one end of the pull rod 8 is threaded into the nut assembly 9 after sequentially passing through the connector 10 and the strand anchor head 12 of the main cable strand 1.
The connector 10 is provided with an anchor head shield 13 covering the extended end of the pre-stressing cable 7, which reduces or prevents corrosion of the pre-stressing cable 7 and the cable body anchor 11, so as to increase its service life.
In this embodiment, the number of the U-shaped pipes 4 is 2-7, and the U-shaped pipes 4 are arranged in parallel and independently, so that the construction can be facilitated. Because if there is only one U-shaped pipe, the U-shaped pipe is too huge to be conveniently constructed, and if the number of the U-shaped pipes is too large, the repeated work is too much, and the construction is also inconvenient.
Preferably, the number of U-shaped pipes 4 is 3-4, and the number of U-shaped pipes 4 is 3 as shown in FIG. 9.
The prestressed cable 7 comprises at least one of a steel strand finished cable, a steel wire finished cable and a carbon fiber finished cable, namely, the prestressed cable 7 can be one of the steel strand finished cable, the steel wire finished cable and the carbon fiber finished cable, or can be used in combination of two or three.
Of course, the prestressed cable 7 can also be a finished cable of other kinds which can meet the use requirements.
There is a gap between the U-shaped pipe 4 and the pre-stress cable 7, and the space between the pre-stress cable 8 and the inner wall of the U-shaped pipe 4 is not filled with anti-corrosion materials. The device has two main advantages, namely the prestressed cable 7 can be replaced conveniently, and the prestressed cable 7 can be monitored by arranging equipment such as a force sensor or an endoscope.
The U-shaped pipe 4 comprises a bent embedded pipe 41, wherein the two ends of the bent embedded pipe 41 are connected with a straight embedded pipe 42, and the bent embedded pipe 41 and the straight embedded pipes 42 at the two ends form a U-shaped structure. Because the dimensions of the bent embedded pipe 41 and the straight embedded pipe 42 are large, the bent embedded pipe 41 is formed by welding a plurality of bent pipe units, and the straight embedded pipe 42 is formed by welding a plurality of straight pipe units.
A construction method of a replaceable anchoring structure for a U-shaped tunnel anchor comprises a construction process and a prestressed cable replacement process.
The construction process comprises the following steps:
step 11, excavating a U-shaped tunnel in the rock mass 3, installing a U-shaped pipe 4 and an anchor embedded part 5 in the U-shaped tunnel, and pouring an anchor plug body 6 into the U-shaped tunnel;
specifically, the bent pre-buried pipe 41 of the U-shaped pipe 4 is formed by welding a plurality of bent pipe units, the straight pre-buried pipe 42 of the U-shaped pipe 4 is formed by welding a plurality of straight pipe units, and the bent pipe units and the straight pipe units are prefabricated in factories and have the length of 10m; the process of pouring the anchor plug body 6 is that after a section of bent pipe unit is welded, a section of anchor plug body is poured, after a bent embedded pipe 41 is welded, a straight pipe unit is welded, and similarly, a section of anchor plug body is poured after a section of straight pipe unit is welded until all the anchor plug body 6 wrapping the anchor unit 2 is poured; then the next anchoring unit 2 is constructed until all the anchoring units 2 are constructed;
step 12, installing the connector 10 on the end face of the embedded part 5 under the anchor;
step 13, penetrating the prestressed cable 7 into the U-shaped pipe 4, wherein the cable body anchors 11 at the two ends are respectively positioned at the connectors 10 at the two ends;
step 14, stretching and anchoring the prestressed cable 7 to enable the cable body anchorage 11 to be anchored on the end face of the connector 10;
step 15, installing an anchor head protective cover 13 to protect the cable body anchor 11 and the prestressed cable 7;
step 16. The tie rod 8 is passed through the connector 10 and the strand anchor head 12 of the main strand 1 and the nut assembly 9 is installed, the line style of the main strand 1 being adjusted by adjusting the nut assembly 9.
The prestressed cable replacement process comprises the following steps:
step 21, removing the anchor head protective cover 13;
step 22, tensioning and unloading prestress at one end of the old prestress rope 7;
step 23, withdrawing the old pre-stressing rope 7 from one end, and simultaneously taking the traction rope from the other end of the old pre-stressing rope 7;
step 24, connecting the index rope with the end part of the new pre-stress rope 7, and pulling the new pre-stress rope 7 into the U-shaped pipe 4;
step 25, tensioning and anchoring the new prestressed cable 7;
step 26, installing the anchor head protective cover 13.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and improvements can be made by those skilled in the art without departing from the structure of the present invention, and these do not affect the effect of the implementation of the present invention and the utility of the patent.
Claims (10)
1. The utility model provides a U-shaped tunnel anchor is with removable anchor structure, its characterized in that, include with main cable strand (1) quantity equal and one-to-one anchor unit (2), anchor unit (2) are including at least one U-shaped pipe (4) that are located rock mass (3), the both ends of U-shaped pipe (4) are equipped with down built-in fitting (5) respectively, be equipped with between U-shaped pipe (4) and rock mass (3) anchor cock body (6), just anchor cock body (6) will under built-in fitting (5) are pre-buried under the anchor, both sides under built-in fitting (5) are connected main cable strand (1) of bridge both sides through cable strand coupling mechanism correspondence respectively, be equipped with prestressing cable (7) in U-shaped pipe (4), the both ends of prestressing cable (7) anchor strand coupling mechanism with both sides respectively.
2. A replaceable anchoring structure for U-shaped tunnel anchors according to claim 1, wherein a plurality of said anchoring units (2) are arranged in a top-to-bottom order or in a horizontal nested arrangement.
3. The replaceable anchoring structure for a U-shaped tunnel anchor according to claim 1, wherein the strand connecting mechanism comprises a pull rod (8), a nut assembly (9) and a connector (10), the connector (10) is connected with the under-anchor embedded part (5), the prestressed cable (7) is anchored with the connector (10) through a cable body anchor (11), and the pull rod (8) passes through the connector (10), a strand anchor head (12) of a main cable strand (1) and is locked through the nut assembly (9).
4. A replaceable anchoring structure for U-shaped tunnel anchors according to claim 3, wherein said connector (10) is provided with an anchor head shield (13) covering the protruding end of said pre-stressing cable (7).
5. The replaceable anchoring structure for a U-shaped tunnel anchor according to claim 1, wherein the number of the U-shaped pipes (4) is 2-7, and the U-shaped pipes (4) are independently arranged in parallel.
6. A replaceable anchoring structure for U-shaped tunnel anchors according to claim 5, wherein the number of U-shaped tubes (4) is optimally 3-4.
7. A replaceable anchoring structure for a U-shaped tunnel anchor according to claim 1, wherein the pre-stressed wire (7) comprises at least one of a steel strand finished wire, a steel wire finished wire, a carbon fiber finished wire.
8. A replaceable anchoring structure for a U-shaped tunnel anchor according to claim 1, wherein a gap exists between the U-shaped tube (4) and the pre-stressing cable (7).
9. The replaceable anchoring structure for the U-shaped tunnel anchor according to claim 1, wherein the U-shaped pipe (4) comprises a bent embedded pipe (41), two ends of the bent embedded pipe (41) are connected with straight embedded pipes (42), and the bent embedded pipe (41) and the straight embedded pipes (42) at two ends form the U-shaped structure.
10. The construction method of the replaceable anchoring structure for the U-shaped tunnel anchor is characterized by comprising a construction process and a prestressed cable replacement process;
the construction process comprises the following steps:
step 11, excavating a U-shaped tunnel in the rock mass (3), installing a U-shaped pipe (4) and an under-anchor embedded part (5) in the U-shaped tunnel, and pouring an anchor plug body (6) into the U-shaped tunnel;
step 12, installing the connector (10) on the end face of the embedded part (5) under the anchor;
step 13, penetrating the prestressed cable (7) into the U-shaped pipe (4), wherein the cable body anchors (11) at the two ends are respectively positioned at the connectors (10) at the two ends;
step 14, stretching and anchoring the prestressed cable (7) to anchor the cable body anchor (11) on the end face of the connector (10);
15, installing an anchor head protective cover (13) to protect the cable body anchor (11) and the prestressed cable (7);
step 16, a pull rod (8) passes through the connector (10) and the cable strand anchor head (12) of the main cable strand (1), a nut assembly (9) is arranged, and the line type of the main cable strand (1) is regulated by regulating the nut assembly (9);
the prestressed cable replacement process comprises the following steps:
step 21, removing the anchor head protective cover (13);
step 22, tensioning and unloading prestress at one end of the old prestress cable (7);
step 23, withdrawing the old pre-stressing rope (7) from one end, and simultaneously taking the old pre-stressing rope (7) into the traction rope from the other end of the old pre-stressing rope;
step 24, connecting the index rope with the end part of a new pre-stress rope (7), and pulling the new pre-stress rope (7) into the U-shaped pipe (4);
step 25, tensioning and anchoring a new prestressed cable (7);
and 26, installing an anchor head protective cover (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311702358.4A CN117626800A (en) | 2023-12-11 | 2023-12-11 | Replaceable anchoring structure for U-shaped tunnel anchor and construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311702358.4A CN117626800A (en) | 2023-12-11 | 2023-12-11 | Replaceable anchoring structure for U-shaped tunnel anchor and construction method |
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| CN117626800A true CN117626800A (en) | 2024-03-01 |
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| CN202311702358.4A Pending CN117626800A (en) | 2023-12-11 | 2023-12-11 | Replaceable anchoring structure for U-shaped tunnel anchor and construction method |
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| CN (1) | CN117626800A (en) |
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- 2023-12-11 CN CN202311702358.4A patent/CN117626800A/en active Pending
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Inventor after: Tian Bo Inventor after: Pu Zhenruome Inventor after: Su Qiang Inventor after: Wu Dongming Inventor after: Li Wanglong Inventor after: Xie Zhengyuan Inventor after: Zhi Lei Inventor after: Zhu Zhi Inventor after: Zheng Xufeng Inventor after: Liu Zhenyu Inventor after: Jiang Jianjun Inventor after: He Feng Inventor after: Chen Li Inventor after: Cao Fahui Inventor after: Bai Guosheng Inventor after: Ren Haibin Inventor before: Su Qiang Inventor before: Wu Dongming Inventor before: Li Wanglong Inventor before: Xie Zhengyuan Inventor before: Zhi Lei Inventor before: Zhu Zhi |
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| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20240712 Address after: No. 2, 3rd Floor, Building 1, No. 535 Tianfu 1st Street, Chengdu High tech Zone, Chengdu Free Trade Zone, Sichuan Province 610041 Applicant after: SICHUAN HIGHWAY PLANNING, SURVEY AND DESIGN INSTITUTE Ltd. Country or region after: China Applicant after: LIUZHOU OVM MACHINERY Co.,Ltd. Address before: 545005 No.1, Yanghui Road, Liuzhou City, Guangxi Zhuang Autonomous Region Applicant before: LIUZHOU OVM MACHINERY Co.,Ltd. Country or region before: China |