CN113089482A - Double-hole single-anchor system and construction method thereof - Google Patents
Double-hole single-anchor system and construction method thereof Download PDFInfo
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- CN113089482A CN113089482A CN202110535250.5A CN202110535250A CN113089482A CN 113089482 A CN113089482 A CN 113089482A CN 202110535250 A CN202110535250 A CN 202110535250A CN 113089482 A CN113089482 A CN 113089482A
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- anchor
- main cable
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- 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
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- 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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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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Abstract
The invention discloses a double-hole single-anchor system, which comprises a main cable access hole, an anchor chamber, a cable scattering saddle, an anchor plug body, a main cable steel strand, an anchor plug body steel strand, a main cable and a mountain body, wherein the main cable access hole extends backwards to form the anchor chamber, the anchor chamber is divided into a front anchor chamber and a rear anchor chamber, the front anchor chamber is communicated with the terminal of the main cable access hole, the rear anchor chamber is positioned at the terminal of the front anchor chamber and is integrally in a wedge shape with a small front part and a large rear part, the anchor plug body is positioned in the rear anchor chamber, the cable scattering saddle is arranged on the side wall at the joint of the main cable access hole and the front anchor chamber, the main cable is scattered into the main cable steel strand through the cable access hole and extends backwards to the rear part of the front anchor chamber, the anchor plug body steel strand extends from the joint of the main cable steel strand to the tail end of the anchor plug body, the main cable is scattered into a plurality of main cable steel strands through the cable scattering saddle and then is connected with the anchor plug body, and the tension of the main cable is uniformly scattered onto the anchor plug body, under the action of tensile force, the side surface of the anchor plug body is extruded and rubbed with surrounding rocks to generate a 'plug effect'.
Description
Technical Field
The invention relates to the technical field of bridge engineering, in particular to a double-hole single-anchor system and a construction method thereof.
Background
The conventional suspension bridge anchorage forms mainly include a gravity type anchorage and a tunnel type anchorage, wherein the gravity type anchorage is formed by excavating a foundation pit and pouring large-volume concrete, and the main cable tension is resisted by the gravity of the gravity type anchorage, so that the defects of large volume, high manufacturing cost and large disturbance to the surrounding environment are overcome; the tunnel type anchorage is characterized in that a tunnel is excavated in a rock mass, concrete is poured in the tunnel, so that the tunnel and surrounding rocks jointly act to form an anchor plug body, a main cable transmits most of tensile force to the surrounding rocks through the anchor plug body, and compared with the gravity type anchorage, the tunnel type anchorage only has the weight of 20% -25% of that of the gravity anchor and has small influence on the surrounding environment.
However, the rock mass between the anchor plugs is not fully utilized in the conventional tunnel anchor, when the mechanical parameters of surrounding rocks are low or the tension of the main cable is high, the volume of the anchor plugs is increased by adopting a longitudinal extension and transverse widening mode in order to improve the drawing bearing capacity of the tunnel type anchor, so that the construction scale of the tunnel type anchor is very large, the excavation difficulty and the slag discarding amount of the tunnel are greatly increased due to the increase of the volume of the tunnel type anchor, and the construction period is also prolonged. And the thickness of the middle wall of the rock body between the left anchor plug body and the right anchor plug body is thinner, so that overlarge disturbance is easily generated on the middle wall of the rock body in the blasting excavation process, and the constraint force of surrounding rocks on the anchor plug bodies is reduced.
Disclosure of Invention
Technical problem to be solved
The tunnel anchor of the double-hole single-anchor system and the construction method thereof are provided for overcoming the defects of the prior art, and the main purpose of the invention is to solve the problem that the excavation difficulty of a tunnel of an anchor plug body is greatly increased due to the fact that the scale of the anchor plug body of a traditional tunnel anchor is increased for improving the pulling bearing capacity of the anchor when the mechanical parameters of surrounding rocks are low or the tensile force of a main cable is high; and because the rock mass middle wall between the left and right anchor chock bodies is weak, blasting excavation is great to the disturbance to it simultaneously to lead to the problem that the restraint of country rock to the anchor chock body reduces.
(II) technical scheme
The invention is realized by the following technical scheme: the invention provides a double-hole single-anchor system which comprises a main cable access hole, an anchor chamber, a cable scattering saddle, an anchor plug body, a main cable steel strand, an anchor plug body steel strand, a main cable and a mountain body, wherein the main cable access hole is symmetrically arranged relative to a central line of a bridge, the main cable access hole extends backwards to form the anchor chamber, the anchor chamber is divided into a front anchor chamber and a rear anchor chamber, the front anchor chamber is communicated with a terminal of the main cable access hole, the rear anchor chamber is positioned at a terminal of the front anchor chamber and is integrally in a wedge shape with a small front part and a large rear part, the anchor plug body is positioned in the rear anchor chamber, the cable scattering saddle is arranged on a side wall at the joint of the main cable access hole and the front anchor chamber, the main cable is scattered into the main cable steel strand through the cable scattering saddle after being accessed from the main cable access hole and extends backwards to the rear part of the front anchor chamber, and the anchor plug body steel strand extends from the joint of the main cable steel strand to the tail end.
Furthermore, the longitudinal section of the anchor plug body is rectangular, and reinforcing steel bars, prestressed pipelines and anchor plug body steel strands are uniformly erected in the anchor plug body and are formed by pouring concrete.
Furthermore, the main cable is connected into the hole and the inner wall surface of the anchor chamber is cast with a lining.
A construction method of a double-hole single-anchor system comprises the following construction steps:
the method comprises the following steps: downward-inclined excavation main cable access holes in the mountain body, turning excavation front anchor chambers to the middle rock mass of tunnels on two sides after reaching a preset depth and keeping the same inclination angle with the main cable access holes;
step two: after the front anchor chambers on the two sides are excavated, excavating a channel towards the opposite side, and after the channel is communicated, continuously excavating downwards by utilizing the channel to form a rear anchor chamber in a wedge shape with a small front part and a large rear part;
step three: erecting reinforcing steel bars, prestressed pipelines and anchor plug body steel strands in a rear anchor chamber, then pouring concrete in sections to form an anchor plug body, and performing prestressed tensioning and anchoring work on the anchor plug body steel strands after the strength of the concrete reaches 100%;
step four: and arranging a cable scattering saddle on the side wall of the main cable access hole, erecting the main cable, scattering the main cable into a plurality of strands of main cable steel stranded wires through the cable scattering saddle, and connecting the main cable steel stranded wires with the anchor plug body steel stranded wires.
(III) advantageous effects
Compared with the prior art, the invention has the following beneficial effects:
the double-hole single-anchor system mainly uses the anchor plug body to provide the anti-pulling bearing capacity, when the double-hole single-anchor system works, the main cables are dispersed into a plurality of main cable steel strands through the cable scattering saddle and then are connected with the anchor plug body steel strands, the tension of the main cables is uniformly dispersed onto the anchor plug body, the side surface of the anchor plug body is extruded and rubbed with surrounding rocks under the action of the tension to generate a bottle plug effect, and meanwhile, the front anchor surface of the anchor plug body extrudes the rock mass between tunnels at two sides to generate resistance to offset the tension of the main cables, and the double-hole single-anchor system has the following main beneficial effects:
1) the reliability is high. According to the invention, the double anchors of the traditional tunnel anchor are combined into one anchor, the original rock mass middle wall between the two anchor plug bodies is cancelled, the insufficient constraint of surrounding rocks on the anchor plug bodies and the mutual disturbance between the two anchor plug bodies are avoided, and the stability of the anchor plug bodies is greatly improved.
2) And the construction period is saved. Compared with the variable cross-section type tunnel of the traditional tunnel anchor, the equal cross-section type main cable access hole and the excavation and support of the front anchor chamber are simpler, and the construction speed can be effectively accelerated. In addition, the anchor plug body has smaller scale and lower construction and excavation difficulty, so the construction period can be further saved.
3) The cost is low. Compared with the traditional tunnel anchor, the rock mass at the front part of the anchor plug body can bear the tension of the main cable together, and the rock mass resources between the front anchor chambers at the two sides are fully utilized, so that the overall scale of the anchor plug body can be reduced, the concrete consumption is greatly reduced, and the engineering budget is reduced.
Drawings
Fig. 1 is an elevational view of the overall structure of the present invention.
Fig. 2 is a plan view of the overall structure of the present invention.
Fig. 3 is a front anchor face layout view.
Fig. 4 is a rear anchor face layout view.
In the figure: 1. a main cable is connected into the hole; 2. a front anchor chamber; 3. a cable saddle; 4. an anchor plug body; 5. main cable steel strand wires; 6. anchoring the body steel strand; 7. a rear anchor chamber; 8. lining; 9. a main cable; 10. a mountain body.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further 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.
The double-hole single-anchor system shown in fig. 1-4 comprises a main cable access hole 1, a front anchor chamber 2, a cable scattering saddle 3, an anchor plug 4, a main cable steel strand 5, an anchor plug steel strand 6, a rear anchor chamber 7, a lining 8, a main cable 9 and a mountain 10, wherein the main cable access hole 1 is symmetrically arranged relative to the central line of a bridge, the front anchor chamber 2 is communicated with the main cable access hole 1 at the terminal, and the cable scattering saddle 3 is arranged on the side wall of the joint of the main cable access hole 1 and the front anchor chamber 2; the anchor plug body 4 is arranged at the tail part of the front anchor chambers 3 at the two sides, the section of the anchor plug body is in a similar rectangle shape, a reinforcing steel bar, a prestressed pipeline and an anchor plug body steel strand 6 are erected inside the anchor plug body and are formed by pouring concrete, and the section area is gradually increased from the front anchor face to the rear anchor face to form a wedge-shaped body with a large front part and a small rear part; the anchor plug body steel strand 6 extends from the joint of the anchor plug body steel strand and the main cable steel strand 5 to the tail end of the anchor plug body 4; the main cable 9 is dispersed into main cable steel strands 5 through the cable saddle 3 and extends backwards to the rear part of the front anchor chamber 2 to be connected with the anchor plug body 4.
The invention relates to a double-hole single-anchor type tunnel anchor system, which comprises the following process flows:
excavation of tunnel anchor hillside cutting → construction of side slope, upward slope and opening → insertion of main cable into hole, excavation of front anchor chamber and lining construction → construction of anchor plug → installation of cable saddle → installation of main cable.
The concrete construction process is as follows:
excavation of tunnel anchor hillside cutting
Cutting excavation is carried out to tunnel anchor place massif 10, levels the construction place, makes things convenient for later stage facility and personnel to enter the field.
Construction of side and up slope and opening of hole
And (4) carrying out tunnel portal drainage engineering construction, excavating and supporting the side slope and the upward slope, and carrying out advanced support on a tunnel pipe shed.
Thirdly, main cable access hole, front anchor chamber excavation and lining construction
The main cable access hole 1 and the front anchor chamber 2 are excavated by adopting a two-step method, the mechanical auxiliary micro-blasting excavation is adopted to ensure the stability of the peripheral rock mass, the primary support construction of the anchor hole is carried out while excavating, the primary support comprises a forepoling (if necessary), a system anchor rod, a reinforcing mesh, a steel frame and sprayed concrete, and the inner wall surfaces of the main cable access hole 1 and the front anchor chamber 2 are poured with a lining 8.
Construction of anchor plug
After the front anchor chambers 2 on the two sides are excavated to the designed depth, the front anchor chambers 2 on the opposite sides are simultaneously excavated, after the two sides are communicated, the space of the anchor plug body 4 is excavated downwards by adopting a three-step normal method, and then the steel bars, the prestressed pipelines and the anchor plug body steel stranded wires 6 are erected in the space and concrete of the anchor plug body 4 is poured in layers. When the prestressed pipeline is placed, the prestressed pipeline is required to be lengthened in sections and accurately positioned; and after the concrete reaches the designed strength of 100%, carrying out prestress tensioning and anchoring work on the anchor plug body steel strand 6.
Fifth, scattered cable saddle construction
Excavating a foundation of the cable saddle 3, binding foundation steel bars after the foundation steel bars are bound, pouring concrete in layers, enhancing temperature monitoring in the pouring process, and taking measures to prevent temperature cracks; and after the foundation construction is finished, installing the cable saddle 3.
Sixthly, mounting a main cable
A full-bridge main cable 9 is erected, and is dispersed into a plurality of strands of main cable steel stranded wires 5 through a cable dispersing saddle 3, and then the main cable steel stranded wires 5 are connected with the anchor plug body steel stranded wires 6.
The working principle of the invention is as follows:
the tunnel anchor of the double-hole single-anchor system mainly provides uplift bearing capacity by the anchor plug body 4. During operation, main push-towing rope 9 is connected with anchor plug body steel strand 6 after dispersing into many main push-towing rope steel strand 5 through loose cable saddle 3, with the even dispersion of the pulling force of main push-towing rope 9 to anchor plug body 4, anchor plug body 4 is under the pulling force effect, and its side extrudees the friction with the country rock, produces "bottle plug effect", thereby the anchor plug body front anchor face extrudes the rock mass between the tunnel of both sides and produces the resistance and so offsets the pulling force of main push-towing rope 9.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention and do not limit the spirit and scope of the present invention. Various modifications and improvements of the technical solutions of the present invention may be made by those skilled in the art without departing from the design concept of the present invention, and the technical contents of the present invention are all described in the claims.
Claims (4)
1. A double-hole single-anchor system is characterized in that: comprises a main cable access hole (1), an anchor chamber, a cable scattering saddle (3), an anchor plug body (4), a main cable steel strand (5), an anchor plug body steel strand (6), a main cable (9) and a mountain body (10), wherein the main cable access hole (1) is symmetrically arranged relative to the central line of a bridge, the main cable access hole (1) extends backwards to form the anchor chamber, the anchor chamber is divided into a front anchor chamber (2) and a rear anchor chamber (7), the front anchor chamber (2) is communicated with the main cable access hole (1), the rear anchor chamber (7) is positioned at the terminal of the front anchor chamber (2) and integrally forms a small front wedge shape and a large rear wedge shape, the anchor plug body (4) is positioned in the rear anchor chamber (7), the cable scattering saddle (3) is arranged on the side wall of the joint of the main cable access hole (1) and the front anchor chamber (2), the main cable (9) is scattered into the main cable steel strand (5) after being accessed into the main cable access hole (1) and extends to the rear of the front anchor chamber (2), the anchor plug body steel strand (6) extends from the joint of the anchor plug body steel strand and the main cable steel strand (5) to the tail end of the anchor plug body (4).
2. A dual-hole single-anchor system as defined in claim 1, wherein: the longitudinal section of the anchor plug body (4) is rectangular, and the inside of the anchor plug body is uniformly provided with steel bars, prestressed pipelines and anchor plug body steel strands (6) which are formed by pouring concrete.
3. A dual-hole single-anchor system as defined in claim 1, wherein: and pouring a lining (8) on the inner wall surfaces of the main cable access hole (1) and the anchor chamber.
4. A construction method of a double-hole single-anchor system as claimed in any one of claims 1 to 3, wherein: the construction steps are as follows:
the method comprises the following steps: the main cable access hole (1) is excavated in the mountain body (10) in a downward inclined mode, and after the main cable access hole (1) reaches a preset depth, the middle rock mass of tunnels on two sides turns to an excavation front anchor chamber (2) and keeps the same inclination angle with the main cable access hole (1);
step two: after the front anchor chambers (2) on the two sides are excavated, channels are excavated towards the opposite sides, and after the channels are communicated, the channels are continuously excavated downwards to form a wedge-shaped rear anchor chamber (2) with a small front part and a large rear part;
step three: erecting reinforcing steel bars, prestressed pipelines and anchor plug body steel strands (6) in the rear anchor chamber (2), then pouring concrete in sections to form an anchor plug body (4), and performing prestressed tensioning and anchoring work on the anchor plug body steel strands (6) after the strength of the concrete reaches 100%;
step four: the side wall of the main cable access hole (1) is provided with a cable scattering saddle (3), the main cable (9) is erected and dispersed into a plurality of strands of main cable steel strands (5) through the cable scattering saddle (3), and then the cable scattering saddle is connected with the anchor plug body steel strands (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110535250.5A CN113089482A (en) | 2021-05-17 | 2021-05-17 | Double-hole single-anchor system and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110535250.5A CN113089482A (en) | 2021-05-17 | 2021-05-17 | Double-hole single-anchor system and construction method thereof |
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| CN113089482A true CN113089482A (en) | 2021-07-09 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113700513A (en) * | 2021-08-03 | 2021-11-26 | 武汉科技大学 | Combined type tunnel anchorage structure |
| CN114922085A (en) * | 2022-06-09 | 2022-08-19 | 湖南科技大学 | Assembly type tunnel anchor system and construction method |
-
2021
- 2021-05-17 CN CN202110535250.5A patent/CN113089482A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113700513A (en) * | 2021-08-03 | 2021-11-26 | 武汉科技大学 | Combined type tunnel anchorage structure |
| CN113700513B (en) * | 2021-08-03 | 2024-05-24 | 武汉科技大学 | Combined tunnel anchorage structure |
| CN114922085A (en) * | 2022-06-09 | 2022-08-19 | 湖南科技大学 | Assembly type tunnel anchor system and construction method |
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