CN212359785U - Yielding primary support structure for controlling large deformation of high-ground-stress soft rock tunnel - Google Patents
Yielding primary support structure for controlling large deformation of high-ground-stress soft rock tunnel Download PDFInfo
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- CN212359785U CN212359785U CN202021893429.5U CN202021893429U CN212359785U CN 212359785 U CN212359785 U CN 212359785U CN 202021893429 U CN202021893429 U CN 202021893429U CN 212359785 U CN212359785 U CN 212359785U
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Abstract
The utility model belongs to the technical field of the tunnel is strutted, a let pressure just prop up structure for high ground stress soft rock tunnel large deformation control is related to, include: the deformation joints are arranged on the concrete spraying layer of the tunnel and are arranged along the longitudinal direction of the tunnel; the plurality of square steel pipes are correspondingly clamped in the deformation joints respectively; a plurality of parallel arrangement's steel bow member, along the horizontal setting in tunnel, every steel bow member includes: a plurality of arches I and arch II; and the plurality of arch frame joints are respectively arranged between the first arch frame and the second arch frame and are used for connecting the first arch frame and the second arch frame, the distance between the end parts of the first arch frame and the second arch frame is adjustable, and the arch frame joints are fixed with the square steel pipe. The utility model discloses can guarantee that the convergence of country rock warp in-process concrete spout the layer and do not take place to distort with square steel pipe and destroy, and the accessible reserves the slip casting hole and carries out the slip casting and fill after warping, further improves the stability of just supporting the system, and the construction is convenient, and the practicality is strong, is worth promoting.
Description
Technical Field
The utility model belongs to the technical field of the tunnel is strutted, concretely relates to let pressure just supporting structure that is used for high ground stress soft rock tunnel big deformation control.
Background
With the increasing demand of the construction of traffic infrastructures in the areas of the middle and the west of China, a large number of deep-buried long and large tunnels are generated at the same time, wherein a large number of high ground stress soft rock strata are inevitably encountered, and great challenges are brought to the design and construction of tunnel support. When the tunnel passes through a deeply-buried weak stratum, the surrounding rock is subjected to relatively serious extrusion deformation due to high ground stress, strong unloading and disturbance effects in excavation, and serious diseases such as lining cracking and invasion limit, anchor rod breaking, steel arch frame distortion and the like occur in primary support along with the increase of the deformation of the surrounding rock, so that the construction of the whole support structure system is influenced and great economic loss is caused.
In order to fully exert the self-bearing capacity of the surrounding rock, partial scholars propose a yielding support technology based on a support concept of yielding first and resisting later, wherein a yielding anchor rod and a yieldable steel arch frame are the most typical. However, the existing yielding anchor rod generally has the defects of low operation efficiency, high construction cost and the like, and cannot well meet the requirements of tunnel construction progress and cost. The flexible steel arch mainly utilizes the friction of the joints of the arch to absorb the energy released by the deformation of surrounding rocks, thereby achieving the purpose of yielding; however, the flexible steel frame joint adopted at present has low rigidity, and is easy to damage under the action of large surrounding rock pressure, so that the integral instability of the arch center is caused. In order to realize effective yielding of the primary support of the high-ground-stress soft rock tunnel and ensure the overall stability of a primary support system, a yielding primary support structure which is simple and convenient to construct and high in practicability needs to be designed.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a let and press just supporting structure for high ground stress soft rock tunnel large deformation control to solve above-mentioned technical problem.
The technical scheme of the utility model is that:
a let press primary structure that is used for high ground stress soft rock tunnel big deformation to control includes:
a plurality of square steel pipes;
the deformation joints are arranged on a concrete spraying layer of the tunnel along the longitudinal direction of the tunnel, and one square steel pipe is clamped in each deformation joint;
a plurality of parallel arrangement's steel bow member, along the horizontal setting in tunnel, every steel bow member all includes: the steel pipe arch structure comprises at least one first arch frame and at least two second arch frames, wherein an arch frame joint is arranged between the first arch frame and the second arch frame and is respectively connected with the first arch frame and the second arch frame through connecting pieces, the distance between the end parts of the first arch frame and the second arch frame is adjustable, and the arch frame joint is fixed with a square steel pipe.
Preferably, the arch joint comprises:
the inner diameter sizes of two ports of the cylinder body are respectively matched with the end parts of the first arch centering and the second arch centering;
the sliding chutes are arranged on one side surface of the cylinder in parallel and are close to one port;
and the mounting holes are uniformly distributed on the side surface where the sliding groove is located and are arranged close to the other port.
Preferably, the arch center joint is fixed with a foot locking anchor rod, and the foot locking anchor rod is fixed on the wall of the tunnel.
Preferably, a plurality of system anchor rods fixed on the wall of the tunnel are uniformly distributed among the foot locking anchor rods.
Preferably, the foot locking anchor rod and the system anchor rod are fixed with a steel mesh which is laid in the sprayed concrete layer.
Preferably, both ends of the steel arch are fixedly connected with the inverted arch respectively.
Preferably, a plurality of grouting holes are formed in the square steel pipe, and the grouting holes are formed in the side face close to the inner wall of the tunnel.
The utility model provides a pair of a let pressure just prop up structure for high ground stress soft rock tunnel large deformation control, its beneficial effect has:
the yielding primary support structure can flexibly adjust the number of the arch frame joints and the section size of the square steel pipe according to the large deformation prediction grade, so that the yielding primary support structure has strong practicability; i-shaped steel arch centering, square steel pipes, anchor rods and the like adopted in the primary support system are common tunnel support members, and additional customization is not needed; the square steel pipe is more stable in compression deformation, the concrete sprayed layer and the square steel pipe can be prevented from being distorted and damaged in the convergence deformation process of the surrounding rock to a certain extent, and grouting filling can be performed through the reserved grouting holes after deformation, so that the stability of a primary support system is further improved; in addition, shaped steel bow member, bow member connect with square steel pipe be connected simply, construction is convenient, have higher feasibility, the practicality is strong, is worth promoting.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a partial enlarged view of the inner wall of the present invention;
fig. 3 is a front view of the steel arch joint of the present invention;
fig. 4 is a top view of the steel arch joint of the present invention.
Reference numerals:
1. yielding the primary support structure; 2. a steel arch frame; 2-1, centering a first; 2-2, an arch frame II; 3. an inverted arch; 4. a reinforcing mesh; 5. spraying a concrete layer; 6. an arch frame joint; 7. a chute; 8. a bolt; 9. a square steel pipe; 10. welding seams; 11. grouting holes; 12. locking the anchor rod; 13. and (5) system anchor rods.
Detailed Description
The utility model provides a let press just structure for high ground stress soft rock tunnel large deformation control, it is right to combine the schematic structure diagram of fig. 1 to fig. 4 below the utility model discloses explain.
Example 1
A let press primary structure that is used for high ground stress soft rock tunnel big deformation to control includes: a plurality of deformation joints, a plurality of square steel pipes 9 and a plurality of steel arches 2 which are arranged in parallel.
Wherein, a plurality of movement joints are arranged on the concrete spraying layer 5 of the tunnel along the longitudinal direction of the tunnel.
The square steel pipes 9 are correspondingly clamped in the deformation joints one by one.
A plurality of steel arches 2 arranged in parallel are arranged along the transverse direction of the tunnel.
Each steel arch 2 is formed by combining and assembling at least one arch I2-1 and at least two arch II 2-2, an arch joint 6 is arranged at the joint of the end of the arch I2-1 and the end of the arch II 2-2, the arch joint 6 is fixed with a square steel pipe 9, the arch joint 6 is respectively connected with the arch I2-1 and the arch II 2-2 through connecting pieces, and the distance between the end parts of the arch I2-1 and the arch II 2-2 can be adjusted through the arch joint 6.
Wherein, the connecting piece can be one of a screw or a bolt.
Specifically, the utility model discloses in the structure of applied bow member joint 6 include:
the inner diameter of two ports of the cylinder body fixed with the square steel pipe 9 is respectively matched with the end parts of the first arch frame 2-1 and the second arch frame 2-2, a plurality of sliding grooves 7 are arranged on one side surface of the cylinder body in parallel, and the plurality of sliding grooves 7 are arranged close to one port.
And the mounting holes are uniformly distributed on the side surface where the sliding groove 7 is located and are arranged close to the other port.
Further, the arch center joint 6 is fixed with a foot locking anchor rod 12, and the foot locking anchor rod 12 is fixed on the wall of the tunnel.
Furthermore, a plurality of system anchor rods 13 fixed on the tunnel wall of the tunnel are uniformly distributed between the foot locking anchor rods 12.
Further, the foot-locking anchor rods 12 and the system anchor rods 13 are fixed with the reinforcing mesh 4 laid in the sprayed concrete layer 5.
Furthermore, two ends of the steel arch frame 2 are respectively fixedly connected with the inverted arch 3.
Furthermore, a plurality of grouting holes 11 are formed in the square steel tube 9, the grouting holes 11 are formed in the side face close to the inner wall of the tunnel, and the grouting holes 11 are used for grouting and filling the inside of the square steel tube 9 through the grouting holes 11 to improve the stability of a primary support system after the tunnel is deformed stably.
Specifically, as shown in fig. 1, the structure of the present invention mainly includes:
The mesh reinforcement 4 is placed in the sprayed concrete layer 5 and its position is fixed by the foot anchor 12 and the system anchor 13.
As shown in fig. 2, the assembled i-section steel arch frame 2 is assembled and connected through arch frame joints 6 to form a single complete arch frame, wherein the upper end part of the second arch frame 2-2 is inserted into the arch frame joints 6, and the flanges of the steel arch frame 2 are connected and fastened with the bolts 8; as shown in fig. 3 and 4, the lower end part of the arch frame one 2-1 is inserted into the arch frame joint 6, the bolt 8 is used for connecting the flange of the steel arch frame 2 with the arch frame joint 6, the elongated sliding groove 7 is adopted on the arch frame joint 6, so that a certain axial relative displacement between the arch frame one 2-1 and the arch frame joint 6 is allowed, and the maximum allowed displacement of the single joint is adjusted through the length of the elongated sliding groove 7.
And (3) setting deformation joints in the longitudinal direction of the tunnel primary sprayed concrete layer 5, and filling the deformation joints with square steel pipes 9, wherein the square steel pipes 9 are connected with the arch frame joints 6 of two adjacent arch frames in a welding mode as shown in fig. 3, welding seams 10 are only arranged at the joints of the lower edges of the square steel pipes 9 and the joints, and the upper surface and the lower surface of each square steel pipe 9 are tightly attached to the sprayed concrete layer 5.
As shown in fig. 1, 4 arch joints 6 are provided for each complete arch (which may be increased or decreased as appropriate according to the compressibility grade prediction of the soft rock large deformation tunnel), and the arch joints 6 are provided with anchor rods 12 for locking feet, thereby enhancing the overall stability of the arch.
Each complete steel arch 2 and an inverted arch 3 are closed into a ring, and a yielding primary support structure for controlling large deformation of a high ground stress soft rock tunnel is formed under the combined action of a system anchor rod 13, a sprayed concrete layer 5 and a longitudinal connection square steel pipe 9.
When the tunnel suffers from large deformation of soft rock, the surrounding rock is subjected to convergence deformation to cause the primary lining shotcrete layer 5 to annularly extrude the upper surface and the lower surface of the square steel pipe 9, the square steel pipe 9 is deformed under pressure and releases certain surrounding rock pressure, so that a surrounding rock-supporting system reaches a new balance state; meanwhile, the surrounding rock convergently extrudes the steel arch 2 to cause the relative displacement of the first arch 2-1 and the second arch 2-2 in the arch joint 6; in particular, as shown in fig. 2, since the arch one 2-1 is connected with the arch joint 6 through the elongated runner 7, it is ensured that the square steel tube 9 is deformed by compression in coordination with the adjacent connected arch. A plurality of grouting holes 11 are formed in the upper portion of the side face of the square steel pipe 9 along the inner wall of the tunnel, and after the tunnel is deformed stably, grouting filling is conducted in the square steel pipe 9 through the grouting holes 11, so that the stability of a primary support system can be further improved.
The utility model discloses technical principle is simple, and except that the bow member connects and need design the customization in the used part, all the other are conventional founds, and the structure simple installation just easily operates, can solve high ground stress soft rock tunnel big deformation problem betterly, and the practicality is strong, is worth promoting.
The above disclosure is only for the preferred embodiments of the present invention, however, the present invention is not limited thereto, and any changes that can be considered by those skilled in the art should fall within the protection scope of the present invention.
Claims (7)
1. A let and press primary structure that is used for big deformation control of high ground stress soft rock tunnel, its characterized in that includes:
a plurality of square steel pipes (9);
the deformation joints are arranged on a concrete spraying layer (5) of the tunnel along the longitudinal direction of the tunnel, and one square steel pipe (9) is clamped in each deformation joint;
a plurality of parallel arrangement's steel bow member (2), along the horizontal setting in tunnel, every steel bow member (2) all includes: the steel pipe arch structure comprises at least one first arch (2-1) and at least two second arches (2-2), an arch joint (6) is arranged between the first arch (2-1) and the second arch (2-2), the arch joint (6) is respectively connected with the first arch (2-1) and the second arch (2-2) through connecting pieces, the distance between the ends of the first arch (2-1) and the second arch (2-2) is adjustable, and the arch joint (6) is fixed with a square steel pipe (9).
2. The yielding primary structure for controlling large deformation of high-ground-stress soft rock tunnel according to claim 1, wherein the arch connector (6) comprises:
the inner diameter of two ports of the cylinder body are respectively matched with the end parts of the first arch frame (2-1) and the second arch frame (2-2);
the sliding chutes (7) are arranged on one side surface of the cylinder body in parallel and are close to one port;
and the mounting holes are uniformly distributed on the side surface where the sliding groove (7) is located and are arranged close to the other port.
3. The yielding primary support structure for controlling the large deformation of the high-ground-stress soft rock tunnel according to claim 1, wherein the arch truss joint (6) is fixed with a foot-locking anchor rod (12), and the foot-locking anchor rod (12) is fixed on the tunnel wall of the tunnel.
4. The yielding primary support structure for controlling the large deformation of the high-ground-stress soft rock tunnel according to claim 3, wherein a plurality of system anchor rods (13) fixed on the tunnel wall of the tunnel are uniformly distributed among the foot-locking anchor rods (12).
5. The yielding primary support structure for controlling the large deformation of the high-ground-stress soft rock tunnel according to claim 4, wherein the foot-locking anchor rods (12) and the system anchor rods (13) are fixed with reinforcing mesh (4) laid in the sprayed concrete layer (5).
6. The yielding primary support structure for controlling the large deformation of the high-ground-stress soft rock tunnel according to claim 1, wherein two ends of the steel arch (2) are fixedly connected with the inverted arch (3) respectively.
7. The yielding primary support structure for controlling the large deformation of the high-ground-stress soft rock tunnel according to claim 1, wherein a plurality of grouting holes (11) are formed in the square steel pipe (9), and the grouting holes (11) are arranged on the side surface close to the inner wall of the tunnel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021893429.5U CN212359785U (en) | 2020-09-02 | 2020-09-02 | Yielding primary support structure for controlling large deformation of high-ground-stress soft rock tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021893429.5U CN212359785U (en) | 2020-09-02 | 2020-09-02 | Yielding primary support structure for controlling large deformation of high-ground-stress soft rock tunnel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212359785U true CN212359785U (en) | 2021-01-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021893429.5U Expired - Fee Related CN212359785U (en) | 2020-09-02 | 2020-09-02 | Yielding primary support structure for controlling large deformation of high-ground-stress soft rock tunnel |
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| Country | Link |
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| CN (1) | CN212359785U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114252356A (en) * | 2021-12-20 | 2022-03-29 | 天津大学 | Multi-line tunnel transient excavation unloading device and method |
| CN115467681A (en) * | 2022-08-09 | 2022-12-13 | 西南交通大学 | Tunnel arch node connecting structure, tunnel arch and tunnel construction method |
-
2020
- 2020-09-02 CN CN202021893429.5U patent/CN212359785U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114252356A (en) * | 2021-12-20 | 2022-03-29 | 天津大学 | Multi-line tunnel transient excavation unloading device and method |
| CN114252356B (en) * | 2021-12-20 | 2023-11-07 | 天津大学 | Transient excavation unloading device and method for multi-line tunnel |
| CN115467681A (en) * | 2022-08-09 | 2022-12-13 | 西南交通大学 | Tunnel arch node connecting structure, tunnel arch and tunnel construction method |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210115 Termination date: 20210902 |