CN215979409U - Y-shaped fork hole closed steel arch frame supporting structure - Google Patents
Y-shaped fork hole closed steel arch frame supporting structure Download PDFInfo
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- CN215979409U CN215979409U CN202121793475.2U CN202121793475U CN215979409U CN 215979409 U CN215979409 U CN 215979409U CN 202121793475 U CN202121793475 U CN 202121793475U CN 215979409 U CN215979409 U CN 215979409U
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Abstract
The utility model relates to a Y-shaped fork hole closed steel arch frame supporting structure. The utility model is suitable for the field of support of Y-shaped fork holes. The technical scheme of the utility model is a Y-shaped fork hole closed steel arch frame supporting structure, wherein the Y-shaped fork hole is provided with a main hole, a fork hole, a first branch hole and a second branch hole which are connected with the fork hole, and the Y-shaped fork hole closed steel arch frame supporting structure is characterized by comprising the following components: the closed first profile steel arch frames are uniformly arranged in the main tunnel along the axial direction of the main tunnel; the closed second type variable span steel arch frames are uniformly arranged in the fork along the axial direction of the fork; the third profile steel arch frames are semi-closed, and a plurality of third profile steel arch frames are uniformly arranged in the crossing area of the fork tunnel and the branch tunnel along the axial direction of the branch tunnel; and the fourth steel arches are uniformly arranged in the branch tunnel along the axial direction of the branch tunnel, and the arches are connected through longitudinal connecting steel bars.
Description
Technical Field
The utility model relates to a Y-shaped fork hole closed steel arch frame supporting structure. The support device is suitable for the field of support of Y-shaped fork holes.
Background
In the water conservancy and hydropower engineering, the Y-shaped fork hole is complex in excavation size and large in excavation span, and if the fork hole is arranged in an area with good geological surrounding rock conditions, the surrounding rock can be guaranteed to be stable by adopting a spray anchor support and conventional construction scheme. If the geological conditions of the surrounding rock tunnel section at the fork hole are poor, strong support measures with higher rigidity, such as an arch frame, are required. Limited by the construction scheme requirements of the turnout body type and the turnout crotch excavation, the arch frame at the turnout crotch often cannot form a closed supporting structure along with the excavation tunnel face, and the effects of large supporting rigidity and timely supporting of the arch frame cannot be exerted. The method is not consistent with the design and support concept of the tunnel of the new Olympic method, and the surrounding rock stability and the construction safety at the fork hole have hidden troubles.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is as follows: in order to solve the technical problem, the utility model provides a Y-shaped fork closed steel arch support structure.
The technical scheme adopted by the utility model is as follows: a kind of Y-type fork closed steel arch centering supporting construction, the said Y-type fork has main tunnel, fork tunnel and first tunnel and second tunnel connected with fork tunnel, characterized by that, have:
the first profile steel arch frames are closed, and the plurality of first profile steel arch frames are uniformly arranged in the main tunnel along the axial direction of the main tunnel;
the second type variable span steel arch is closed, and a plurality of second type variable span steel arches are uniformly arranged in the fork along the axial direction of the fork;
the third profile steel arch frames are uniformly arranged in the cross area of the fork and the branch tunnel along the axial direction of the branch tunnel, are semi-closed type arch frames and are fixedly connected with the adjacent second type variable span steel arch frames;
the fourth steel arches are uniformly arranged in the branch tunnel along the axial direction of the branch tunnel;
and the longitudinal connecting steel bar is used for fixedly connecting the adjacent first profile steel arch, the adjacent second type variable span steel arch, the adjacent third profile steel arch, the adjacent fourth profile steel arch, the adjacent first profile steel arch and second type variable span steel arch, the adjacent second type variable span steel arch and third profile steel arch and the adjacent third profile steel arch and fourth profile steel arch.
Preferably, the semi-closed third steel arch is welded with the adjacent second variable-span steel arch through the horizontal section of the third steel arch to form a closed structure.
Preferably, the first profile steel arch comprises a first side top arch and a first inverted arch, the first side top arch and the first inverted arch are made of i-steel, and the first side top arch is fixedly connected with the surrounding rock through an anchor rod.
Preferably, the second type variable span steel arch comprises a second side top arch and a second inverted arch, the second side top arch and the second inverted arch are made of I-steel, and the second side top arch is fixedly connected with the surrounding rock through an anchor rod.
Preferably, the third profile steel arch comprises a third side top arch and a third inverted arch, the third side top arch and the third inverted arch are made of i-steel, the third side top arch is a semi-arch steel arch, the third inverted arch is a semi-inverted arch, the third side top arch is fixedly connected with the surrounding rock through an anchor rod, and the third side top arch and the third inverted arch are respectively connected with the adjacent horizontal sections of the second side top arch and the second inverted arch in a welding mode.
Preferably, the fourth steel arch comprises a fourth top arch and a fourth inverted arch, the fourth top arch and the fourth inverted arch are made of i-steel, and the fourth top arch is fixedly connected with the surrounding rock through an anchor rod.
Preferably, the bottom of the anchor rod fixedly connected with the first profile steel arch, the second profile steel arch, the third profile steel arch and the fourth profile steel arch is bent, and the bent horizontal position of the bottom of the anchor rod is welded with the bottom flange of each steel arch respectively.
Preferably, the first side top arch frame and the first inverted arch frame, the second side top arch frame and the second inverted arch frame, the third side top arch frame and the third inverted arch frame, and the fourth side top arch frame and the fourth inverted arch frame are fixedly connected by connecting steel plates, the connecting steel plates are fixedly welded at the joints of the side top arch frames and the inverted arch frames respectively, and the connecting steel plates between the side top arch frames and the inverted arch frames are fixedly connected by bolts and nuts.
Preferably, two ends of the longitudinal connecting steel bar are bent, and the bent parts of the two ends of the longitudinal connecting steel bar are fixedly connected to the adjacent steel arch frames through angle steels.
A method for supporting a closed steel arch frame of a Y-shaped fork tunnel is characterized in that,
s1, completing main tunnel excavation from the main tunnel to the branch tunnel direction, performing primary spraying of steel fiber concrete for support after excavation forming, installing a reinforcing mesh, a plurality of first steel arch frames, anchor rods and longitudinal connecting reinforcing steel bars after the strength of the primary spraying concrete meets the requirement, and performing secondary spraying of steel fiber concrete for support after completion;
s2, before excavating the fork hole, constructing radial pipe sheds for advance support, and after the grouting strength of the pipe sheds meets the requirements, starting excavating the fork hole;
s3, primarily spraying steel fiber concrete for supporting after the fork excavation forming, installing a steel bar net piece, a second type variable span steel arch frame, an anchor rod and a longitudinal connecting steel bar after the strength of the primarily sprayed steel fiber concrete meets the requirement, and re-spraying the steel fiber concrete for supporting after the completion;
s4, after the support of the fork hole is completed, excavating a cross area of the fork hole and the first branch hole, excavating and forming, primarily spraying steel fiber concrete to support, after the strength of the primarily sprayed steel fiber concrete meets the requirement, installing a reinforcing steel mesh, a third steel arch, an anchor rod and longitudinal connecting reinforcing steel bars, and after the support is completed, re-spraying the steel fiber concrete to support;
s5, after supporting of the intersection of the fork hole and the first branch hole is finished, continuing excavation along the direction of the first branch hole, after excavation forming, primarily spraying steel fiber concrete to serve as a support, after the strength of the primarily sprayed steel fiber concrete meets requirements, installing a reinforcing mesh, a fourth steel arch, an anchor rod and longitudinal connecting reinforcing steel bars, and after finishing, re-spraying the steel fiber concrete;
s6, after the first branch hole is supported, excavating a cross area of the branch hole and the second branch hole, excavating and forming, primarily spraying steel fiber concrete to support, installing a steel bar net piece, a third steel arch frame, an anchor rod and longitudinal connecting steel bars after the strength of the steel fiber concrete meets the requirement, and re-spraying the steel fiber concrete to support;
and S7, after supporting at the intersection of the fork hole and the second branch hole is finished, continuing excavating along the direction of the second branch hole, after excavation and forming, primarily spraying steel fiber concrete to be used for supporting, after the strength of the primarily sprayed steel fiber concrete meets the requirement, installing a reinforcing mesh, a fourth steel arch frame, an anchor rod and longitudinal connecting reinforcing steel bars until the distance from the tunnel face to the fork hole is not less than three times of the distance of the tunnel face, and re-spraying the steel fiber concrete after the construction is finished.
The utility model has the beneficial effects that: in the area with poor geology of the surrounding rock tunnel section, the main tunnel, the fork tunnel and the branch tunnel are sequentially excavated and supported, the effects of large supporting rigidity and timely supporting of the arch frames can be fully exerted, and the third section steel arch frame at the fork crotch of the fork tunnel is fixedly connected with the second section variable span steel arch frame at the adjacent fork tunnel to form a closed supporting structure.
Drawings
FIG. 1 is a schematic plan view of a Y-shaped fork type steel arch.
FIG. 2 is a sectional view of the first steel arch.
FIG. 3 is a sectional view of a second type variable span steel arch.
FIG. 4 is a sectional view of a third steel arch.
FIG. 5 is a sectional view of a fourth steel arch.
Fig. 6 is a detailed view of the butt joint of the steel arches.
Fig. 7 is a detailed view of connection of each steel arch and the anchor rod.
Fig. 8 is a detailed view of the longitudinal connecting bars.
In the figure: 1. the main cave, 2, fork cave, 3, first branch cave, 4, second branch cave, 5, first shaped steel bow member, 6, second type variable span steel bow member, 7, third shaped steel bow member, 8, fourth shaped steel bow member, 9, anchor rod, 10, steel fiber concrete layer, 11, reinforcing bar net piece, 12, longitudinal connecting reinforcing bar, 13, first side top arch bow member, 14, first inverted arch bow member, 15, second side top arch bow member, 16, second inverted arch bow member, 17, third side top arch bow member, 18, third inverted arch bow member, 19, fourth side top arch bow member, 20, fourth inverted arch bow member, 21, connecting steel plate, 22, angle steel.
Detailed Description
The embodiment is a Y-shaped fork hole closed steel arch support structure, and the Y-shaped fork hole is provided with a main hole, a fork hole, a branch hole and steel arch support structures arranged in the main hole, the fork hole and the branch hole.
In this embodiment, evenly install a plurality of first shaped steel bow member along main hole axis direction in the main hole, first shaped steel bow member is the closed steel bow member that is formed by the combination of first side top arch bow member and first inverted arch bow member, and first side top arch bow member and first inverted arch bow member all adopt the I-steel, and first side top arch bow member passes through the stock and fixes with the country rock, the stock bottom is buckled, and the horizontal position that the stock bottom is buckled welds with the bottom edge of a wing of first side top arch bow member, has sprayed steel fiber concrete on main hole inner wall to bury the reinforcing bar net piece in steel fiber concrete layer.
Furthermore, all adopt connection steel sheet fixed connection between first side top arch bow member and the first inverted arch bow member, first side top arch bow member and first inverted arch bow member respectively have connection steel sheet at first side top arch bow member and the fixed welding of first inverted arch bow member junction, pass through bolt and nut fixed connection between the connection steel sheet between first side top arch bow member and the first inverted arch bow member.
Furthermore, a plurality of longitudinal connecting steel bars for connecting the two first profile steel arches are arranged between the two adjacent first profile steel arches, two ends of each longitudinal connecting steel bar are bent, and bent parts at two ends of each longitudinal connecting steel bar are fixedly connected to the adjacent steel arches through angle steel.
In this embodiment, evenly install a plurality of second type variable span steel bow member along the fork hole axial direction in the fork hole, second type variable span steel bow member is the closed steel bow member that is formed by the combination of second limit top arch bow member and second inverted arch bow member, and second limit top arch bow member and second inverted arch bow member all adopt the I-steel, and second limit top arch bow member passes through the stock and fixes with the country rock, the stock bottom is buckled, and the horizontal position of stock bottom buckle welds with the bottom edge of a wing of second limit top arch bow member, has sprayed steel fiber concrete on the fork hole inner wall to bury the reinforcing bar net piece in steel fiber concrete layer.
Further, all adopt connection steel sheet fixed connection between second limit top arch bow member and the second inverted arch bow member, second limit top arch bow member and second inverted arch bow member have connection steel sheet at second limit top arch bow member and second inverted arch bow member junction fixed welding respectively, through bolt and nut fixed connection between the connection steel sheet between second limit top arch bow member and the second inverted arch bow member.
Furthermore, a plurality of longitudinal connecting steel bars are installed between two adjacent second type variable span steel arches and the adjacent first type variable span steel arch and second type variable span steel arches, the two ends of each longitudinal connecting steel bar are bent, and the bent parts of the two ends of each longitudinal connecting steel bar are fixedly connected to the adjacent steel arches through angle steel.
In this embodiment, evenly install a plurality of third shaped steel bow member along branch tunnel axis direction in fork hole and branch tunnel intersection region, the semi-enclosed steel bow member that third shaped steel bow member was formed for the combination by third top arch bow member and third inverted arch bow member, and third top arch bow member and third inverted arch bow member all adopt the I-steel, and third top arch bow member passes through the stock and is fixed with the country rock, the stock bottom is buckled, and the horizontal position of stock bottom buckle welds with the bottom edge of a wing of third top arch bow member, has sprayed steel fiber concrete on fork hole and branch tunnel intersection region inner wall to bury the reinforcing bar net piece in steel fiber concrete layer.
Furthermore, a third profile steel arch is fixedly connected with a second profile steel arch close to the third profile steel arch, and a third side top arch and a third inverted arch are respectively connected with the second side top arch and the second inverted arch in a welding mode.
Further, all adopt connection steel sheet fixed connection between third top arch bow member and the third inverted arch bow member, third top arch bow member and third inverted arch bow member have connection steel sheet at third top arch bow member and third inverted arch bow member junction fixed welding respectively, pass through bolt and nut fixed connection between the connection steel sheet between third top arch bow member and the third inverted arch bow member.
Furthermore, a plurality of longitudinal connecting steel bars are arranged between two adjacent third type steel arches and between the adjacent second type variable span steel arch and the third type steel arch, two ends of each longitudinal connecting steel bar are bent, and bent parts at two ends of each longitudinal connecting steel bar are fixedly connected to the adjacent steel arches through angle steel.
In this embodiment, evenly install a plurality of fourth shaped steel bow member along a branch tunnel axis direction in a branch tunnel, the fourth shaped steel bow member is the closed steel bow member that is formed by fourth side top arch bow member and fourth inverted arch bow member combination, and fourth side top arch bow member and fourth inverted arch bow member all adopt the I-steel, and fourth side top arch bow member passes through the stock and fixes with the country rock, the stock bottom is buckled, and the horizontal position that the stock bottom is buckled welds with the bottom edge of a wing of fourth side top arch bow member, has sprayed steel fiber concrete on a branch tunnel inner wall to bury the reinforcing bar net piece in steel fiber concrete layer.
Furthermore, all adopt connection steel sheet fixed connection between fourth side top arch bow member and the fourth inverted arch bow member, fourth side top arch bow member and fourth inverted arch bow member respectively have connection steel sheet at fourth side top arch bow member and the fixed welding of fourth inverted arch bow member junction, pass through bolt and nut fixed connection between the connection steel sheet between fourth side top arch bow member and the fourth inverted arch bow member.
Furthermore, a plurality of longitudinal connecting steel bars are arranged between two adjacent fourth type steel arches and between the adjacent third type variable-span steel arch and the adjacent fourth type steel arches, two ends of each longitudinal connecting steel bar are bent, and bent parts at two ends of each longitudinal connecting steel bar are fixedly connected to the adjacent steel arches through angle steel.
The processing method comprises the following steps:
s1, completing main tunnel excavation from the main tunnel to the branch tunnel direction, performing primary spraying of steel fiber concrete for support after excavation forming, installing a reinforcing mesh, a plurality of first steel arch frames, anchor rods and longitudinal connecting reinforcing steel bars after the strength of the primary spraying concrete meets the requirement, and performing secondary spraying of steel fiber concrete for support after completion;
s2, before excavating to the fork, constructing radial pipe sheds from the top arch part of the main tunnel edge to the direction of the fork to carry out advanced support, wherein the radial pipe sheds comprise drilling holes, inserting rods, grouting and equal strength, after the grouting strength of the pipe sheds meets the requirements, excavating to the fork section, and the footage of each cycle is adaptive to the distance between the arches and is generally not more than 1 m;
s3, primarily spraying steel fiber concrete for supporting after the fork excavation forming, installing a steel bar net piece, a second type variable span steel arch frame, an anchor rod and a longitudinal connecting steel bar after the strength of the primarily sprayed steel fiber concrete meets the requirement, and re-spraying the steel fiber concrete for supporting after the completion;
s4, after the support of the fork hole is completed, excavating a cross area of the fork hole and the first branch hole, excavating and forming, primarily spraying steel fiber concrete to support, after the strength of the primarily sprayed steel fiber concrete meets the requirement, installing a reinforcing steel mesh, a third steel arch, an anchor rod and longitudinal connecting reinforcing steel bars, and after the support is completed, re-spraying the steel fiber concrete to support;
s5, after supporting of the intersection of the fork hole and the first branch hole is finished, continuing excavation along the direction of the first branch hole, after excavation forming, primarily spraying steel fiber concrete to serve as a support, after the strength of the primarily sprayed steel fiber concrete meets requirements, installing a reinforcing mesh, a fourth steel arch, an anchor rod and longitudinal connecting reinforcing steel bars, and after finishing, re-spraying the steel fiber concrete, wherein the length of the first branch hole face away from the fork stop is not less than three times of the branch hole diameter;
s6, after the first branch hole is supported, excavating a cross area of the branch hole and the second branch hole, excavating and forming, primarily spraying steel fiber concrete to support, installing a steel bar net piece, a third steel arch frame, an anchor rod and longitudinal connecting steel bars after the strength of the steel fiber concrete meets the requirement, and re-spraying the steel fiber concrete to support;
and S7, after supporting at the intersection of the fork hole and the second branch hole is finished, continuing excavating along the direction of the second branch hole, after excavation and forming, primarily spraying steel fiber concrete to be used for supporting, after the strength of the primarily sprayed steel fiber concrete meets the requirement, installing a reinforcing mesh, a fourth steel arch frame, an anchor rod and longitudinal connecting reinforcing steel bars until the distance from the tunnel face to the fork hole is not less than three times of the distance of the tunnel face, and re-spraying the steel fiber concrete after the construction is finished.
Claims (7)
1. A kind of Y-type fork closed steel arch centering supporting construction, the said Y-type fork has main tunnel, fork tunnel and first tunnel and second tunnel connected with fork tunnel, characterized by that, have:
the first profile steel arch frames are closed, and the plurality of first profile steel arch frames are uniformly arranged in the main tunnel along the axial direction of the main tunnel;
the second type variable span steel arch is closed, and a plurality of second type variable span steel arches are uniformly arranged in the fork along the axial direction of the fork;
the third profile steel arch frames are uniformly arranged in the cross area of the fork and the branch tunnel along the axial direction of the branch tunnel, are semi-closed type arch frames and are fixedly connected with the adjacent second type variable span steel arch frames;
the fourth steel arches are uniformly arranged in the branch tunnel along the axial direction of the branch tunnel;
and the longitudinal connecting steel bar is used for fixedly connecting the adjacent first profile steel arch, the adjacent second type variable span steel arch, the adjacent third profile steel arch, the adjacent fourth profile steel arch, the adjacent first profile steel arch and second type variable span steel arch, the adjacent second type variable span steel arch and third profile steel arch and the adjacent third profile steel arch and fourth profile steel arch.
2. A Y-type turnout closed steel arch support structure according to claim 1, wherein the semi-closed third steel arch is welded with the adjacent second type variable span steel arch through the horizontal section of the third steel arch to form a closed structure.
3. A Y-shaped turnout closed steel arch support structure according to claim 1, the first profile steel arch frame is provided with a first side top arch frame and a first inverted arch frame, the first side top arch frame and the first inverted arch frame are made of I-steel, the first side top arch frame is fixedly connected with surrounding rocks through anchor rods, the bottom of an anchor rod fixedly connected with the first profile steel arch is bent, the horizontal position of the bent bottom of the anchor rod is welded with the bottom flange of the first profile steel arch, the first side top arch and the first inverted arch are fixedly connected by adopting a connecting steel plate, the first side top arch and the first inverted arch are respectively and fixedly welded with the connecting steel plate at the joint of the first side top arch and the first inverted arch, and the connecting steel plates between the first side arch centering and the first inverted arch centering are fixedly connected through bolts and nuts.
4. A Y-shaped turnout closed steel arch support structure according to claim 1, the second type variable span steel arch frame is provided with a second side top arch frame and a second inverted arch frame, the second side top arch frame and the second inverted arch frame adopt I-steel, the second side top arch frame is fixedly connected with surrounding rock through an anchor rod, the bottom of an anchor rod fixedly connected with a second type steel arch is bent, the horizontal position of the bent bottom of the anchor rod is welded with the bottom flange of the second type steel arch, a second side top arch and a second inverted arch are fixedly connected by adopting a connecting steel plate, the second side top arch and the second inverted arch are respectively and fixedly welded with a connecting steel plate at the connecting part of the second side top arch and the second inverted arch, and the connecting steel plates between the second side top arch and the second inverted arch are fixedly connected through bolts and nuts.
5. The Y-shaped forked-opening closed steel arch support structure as claimed in claim 1, wherein the third steel arch is provided with a third top arch and a third inverted arch, the third top arch and the third inverted arch are made of I-steel, the third top arch is a semi-arch, the third inverted arch is a semi-inverted arch, the third top arch is fixedly connected with the surrounding rock through an anchor rod, the third top arch and the third inverted arch are respectively and fixedly connected with the horizontal section of the second type variable span steel arch close to the third steel arch, the bottom of the anchor rod fixedly connected with the third steel arch is bent, the horizontal section of the bottom bend of the anchor rod is welded with the bottom flange of the third steel arch, a connecting steel plate is fixedly connected between the third top arch and the third inverted arch, the third top arch and the third inverted arch are respectively and fixedly connected with a steel plate at the connection position of the third top arch and the third inverted arch, and the connecting steel plates between the third top arch and the third inverted arch are fixedly connected through bolts and nuts.
6. A Y-shaped turnout closed steel arch support structure according to claim 1, the fourth steel arch frame is provided with a fourth top arch frame and a fourth inverted arch frame, the fourth top arch frame and the fourth inverted arch frame adopt I-shaped steel, the fourth top arch frame is fixedly connected with surrounding rocks through anchor rods, the bottom of an anchor rod fixedly connected with a fourth section steel arch is bent, the horizontal position of the bent bottom of the anchor rod is welded with the bottom flange of the fourth section steel arch, a fourth side top arch is fixedly connected with a fourth inverted arch by adopting a connecting steel plate, the fourth side top arch and the fourth inverted arch are respectively and fixedly welded with the connecting steel plate at the connecting part of the fourth side top arch and the fourth inverted arch, and the connecting steel plates between the fourth top arch and the fourth inverted arch are fixedly connected through bolts and nuts.
7. The Y-shaped turnout closed steel arch support structure of claim 1, wherein two ends of the longitudinal connecting steel bar are bent, and the bent parts of the two ends of the longitudinal connecting steel bar are fixedly connected to each adjacent steel arch through angle steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121793475.2U CN215979409U (en) | 2021-08-03 | 2021-08-03 | Y-shaped fork hole closed steel arch frame supporting structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121793475.2U CN215979409U (en) | 2021-08-03 | 2021-08-03 | Y-shaped fork hole closed steel arch frame supporting structure |
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| Publication Number | Publication Date |
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| CN215979409U true CN215979409U (en) | 2022-03-08 |
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| CN202121793475.2U Active CN215979409U (en) | 2021-08-03 | 2021-08-03 | Y-shaped fork hole closed steel arch frame supporting structure |
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2021
- 2021-08-03 CN CN202121793475.2U patent/CN215979409U/en active Active
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