阅读说明：本技术 一种双层可伸缩钢拱架 (Double-layer telescopic steel arch frame ) 是由 陈立平 应国刚 朱汉华 于 2019-12-03 设计创作，主要内容包括：本发明属于建筑支护结构技术领域,公开了一种双层可伸缩钢拱架,包括外圈伸缩层、中间荷载调节器和内圈支撑钢架,所述外圈伸缩层内弧面与所述中间载荷调节器铰接连接,外弧面与隧道围岩密贴,所述中间载荷调节器包括调节液压缸和管路,所述中间载荷调节器远离所述铰接端通过所述管路卡接在所述内圈支撑钢架上,所述内圈支撑钢架包括工字型钢架和螺栓连接板组成,所述螺丝连接板上设有供所述管路卡接的卡槽；本发明的双层可伸缩钢拱架可以通过荷载调节器调节钢拱架荷载分布规律；且可以通过钢架伸缩释放围岩荷载,降低其所受荷载；同时可以在通过荷载调节器施加前期预应力,降低混凝土先期开裂风险。(The invention belongs to the technical field of building supporting structures, and discloses a double-layer telescopic steel arch frame which comprises an outer ring telescopic layer, a middle load regulator and an inner ring supporting steel frame, wherein the inner cambered surface of the outer ring telescopic layer is hinged with the middle load regulator, the outer cambered surface is closely attached to tunnel surrounding rock, the middle load regulator comprises a regulating hydraulic cylinder and a pipeline, the middle load regulator is far away from the hinged end and is clamped on the inner ring supporting steel frame through the pipeline, the inner ring supporting steel frame comprises an I-shaped steel frame and a bolt connecting plate, and a clamping groove for clamping the pipeline is arranged on the bolt connecting plate; the double-layer telescopic steel arch can adjust the load distribution rule of the steel arch through the load regulator; the surrounding rock load can be released through the expansion and contraction of the steel frame, so that the load borne by the surrounding rock can be reduced; meanwhile, early-stage prestress can be applied through the load regulator, and the early-stage cracking risk of the concrete is reduced.)

1. The utility model provides a double-deck scalable steel bow member, a serial communication port, double-deck scalable steel bow member includes that outer lane telescopic layer (1), middle load regulator (2) and inner circle support steelframe (3), outer lane telescopic layer (1) inner arc face with middle load regulator (2) are articulated to be connected, outer arc face and tunnel country rock are close to, middle load regulator (2) are including adjusting pneumatic cylinder (4) and pipeline (5), middle load regulator (2) are kept away from the hinged end passes through pipeline (5) joint is in on inner circle support steelframe (3), inner circle support steelframe (3) are including I shape steelframe (6) and bolted connection board (7) are constituteed, be equipped with the confession on bolted connection board (7) draw-in groove (8) of pipeline (5) joint.

2. The double-layer telescopic steel arch according to claim 1, wherein the adjusting hydraulic cylinder (4) comprises a cylinder housing (9), an upper stroke connecting rod (10), an intermediate load adjusting piston (11) and a lower load transferring piston (12), the intermediate load adjusting piston (11), the lower load transferring piston (12) and the upper stroke connecting rod (10) are hermetically mounted in the adjusting hydraulic cylinder (4), a connecting rod (13) is fixed at the upper end of the cylinder housing (9), and the connecting rod (13) is fixed on the pipeline (5) far away from the cylinder housing (9).

3. The double-deck telescopic steel arch according to claim 2, characterised in that the adjusting cylinder (4) is internally filled with a liquid medium comprising hydraulic oil, water or other liquid.

4. The double-deck telescopic steel arch according to claim 1, characterised in that said pipeline (5) is provided with a plurality of intermediate load adjusters (2) along its arc direction, a number of said intermediate load adjusters (2) being arranged equidistantly.

5. The double-deck telescopic steel arch according to claim 1-4, wherein every two inner ring support steel frames (3) are connected end to end by the bolt connecting plates (7) at two ends.

Technical Field

The invention belongs to the technical field of building supporting structures, and particularly relates to a double-layer telescopic steel arch frame.

Background

The existing tunnel is generally lined by composite linings, namely an inner primary support and an outer secondary lining. The primary support is usually in a combination form of steel arch frames and sprayed concrete. In the design concept of the tunnel, the primary support can bear all loads, and the secondary lining is used as safe reserve. Therefore, the lining primary support is required to have sufficient bearing capacity. The force acting on the support mainly comes from surrounding rocks outside the tunnel, the surrounding rocks compress the lining through deformation, and along with the gradual development of the deformation of the surrounding rocks, the load on the lining is gradually increased. When the load increases beyond the load bearing limit of the lining, damage can occur.

The steel arch frames used in the prior primary support are formed by connecting I-shaped steel, and the steel arch frames are connected into a ring and then are covered at the limit by using sprayed concrete to form a first-layer primary support.

In summary, the problems of the prior art are as follows: the steel arch frame can only passively bear the deformation load of the surrounding rock, and cannot actively adapt to and adjust the deformation load of the surrounding rock. Under normal conditions, the load of surrounding rock is positively correlated with the deformation, and when the surrounding rock deforms greatly, the load borne by the steel arch frame is large, so that instability and damage are easy to occur, and safety accidents are caused.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a double-layer telescopic steel arch frame.

The double-layer telescopic steel arch comprises an outer ring telescopic layer, a middle load regulator and an inner ring supporting steel frame, wherein the inner arc surface of the outer ring telescopic layer is hinged with the middle load regulator, the outer arc surface of the outer ring telescopic layer is closely attached to surrounding rocks of a tunnel, the middle load regulator comprises a regulating hydraulic cylinder and a pipeline, the middle load regulator is far away from the hinged end and is clamped on the inner ring supporting steel frame through the pipeline, the inner ring supporting steel frame comprises an I-shaped steel frame and a bolt connecting plate, and a clamping groove for clamping the pipeline is formed in the bolt connecting plate.

As a preferable technical scheme of the double-layer telescopic steel arch frame, the adjusting hydraulic cylinder comprises a cylinder body shell, an upper stroke connecting rod, a middle load adjusting piston and a lower load transmitting piston, the middle load adjusting piston, the lower load transmitting piston and the upper stroke connecting rod are all arranged in the adjusting hydraulic cylinder body in a sealing mode, the upper end of the cylinder body shell is fixedly provided with a connecting rod, and the end, far away from the cylinder body shell, of the connecting rod is fixed on the pipeline.

As a preferable technical scheme of the double-layer telescopic steel arch frame, the adjusting hydraulic cylinder is filled with a liquid medium, and the liquid medium comprises hydraulic oil, water or other liquid.

As the preferable technical scheme of the double-layer telescopic steel arch frame, a plurality of intermediate load regulators are arranged on the pipeline along the arc direction of the pipeline, and the intermediate load regulators are arranged at equal intervals.

As a preferable technical scheme of the double-layer telescopic steel arch frame, every two inner ring support steel frames are connected end to end through the bolt connecting plates at two ends.

The invention has the advantages and positive effects that:

(1) the load distribution rule of the steel arch frame can be adjusted through the load adjuster.

(2) The surrounding rock load can be released through the expansion of the steel frame, and the load borne by the surrounding rock can be reduced.

(3) The early prestress can be applied through the load regulator, and the early cracking risk of the concrete is reduced.

Drawings

FIG. 1 is a schematic diagram of a structure provided by an embodiment of the present invention;

FIG. 2 is a schematic top view of FIG. 1 provided in accordance with an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view taken along line A-A of FIG. 2 according to an embodiment of the present invention;

FIG. 4 is an enlarged schematic view at I of FIG. 3 according to an embodiment of the present invention;

in the figure: 1. an outer telescopic layer; 2. an intermediate load adjuster; 3. the inner ring supports the steel frame; 4. adjusting a hydraulic cylinder; 5. a pipeline; 6. an I-shaped steel frame; 7. a bolt connecting plate; 8. a card slot; 9. a cylinder housing; 10. an upper stroke link; 11. an intermediate load adjusting piston; 12. a lower load transfer piston; 13. a connecting rod.

Detailed Description

In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings.

The structure of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in fig. 1 to 4, the double-layer telescopic steel arch provided by the embodiment of the invention comprises an outer ring telescopic layer 1, a middle load regulator 2 and an inner ring supporting steel frame 3, wherein an inner arc surface of the outer ring telescopic layer 1 is hinged with the middle load regulator 2, an outer arc surface of the outer ring telescopic layer is closely attached to tunnel surrounding rock, the middle load regulator 2 comprises a regulating hydraulic cylinder 4 and a pipeline 5, the middle load regulator 2 is far away from the hinged end and is clamped on the inner ring supporting steel frame 3 through the pipeline 5, the inner ring supporting steel frame 3 comprises an i-shaped steel frame 6 and a bolt connecting plate 7, and the bolt connecting plate 7 is provided with a clamping groove 8 for clamping the pipeline 5.

Specifically, the adjusting hydraulic cylinder 4 comprises a cylinder shell 9, an upper stroke connecting rod 10, an intermediate load adjusting piston 11 and a lower load transmitting piston 12, wherein the intermediate load adjusting piston 11, the lower load transmitting piston 12 and the upper stroke connecting rod 10 are hermetically mounted in the adjusting hydraulic cylinder 4, a connecting rod 13 is fixed at the upper end of the cylinder shell 9, and the connecting rod 13 is far away from the cylinder shell 9 and is fixed on the pipeline 5.

Specifically, the adjusting hydraulic cylinder 4 is filled with a liquid medium, and the liquid medium includes hydraulic oil, water, or other liquid.

Specifically, pipeline 5 is equipped with a plurality of middle load regulators 2, a plurality of along its arc direction 2 equidistance settings of middle load regulator, 5 terminal hydraulic pressure meters of installation of pipeline and valve for 2 internal load of load regulator and adjust pressure in the middle of the monitoring steel bow member.

Specifically, every two inner ring support steel frames 3 are connected end to end through the bolt connecting plates 7 at two ends

The working principle of the invention is as follows: when in use, a group of a plurality of independent inner ring support steel frames 3 are connected end to end through bolt connecting plates 7 to form a steel arch ring which is installed and fixed at a tunnel surrounding rock, the outer ring telescopic layer 1 is tightly attached to the tunnel surrounding rock, the pipeline 5 is communicated, a load transfer medium is injected into the pipeline 5, the internal medium is transferred into the connecting rod 13 through the pipeline 5 and then transferred into the cylinder body shell 9, by the movements of the intermediate load adjusting piston 11 and the lower load transmitting piston 12 inside the oil pressure adjusting cylinder housing 9, further driving the upper stroke connecting rod to move, adjusting the distance between the outer ring telescopic layer 1 and the inner ring support steel frame 3 through the sliding of the upper stroke connecting rod 10 in the cylinder body shell, releasing the load of the surrounding rock, meanwhile, the distribution rule of the load of the steel arch frame can be adjusted, and a hydraulic meter and a valve are installed at the tail end of the pipeline 5 and used for monitoring the internal load of the steel arch frame middle load regulator 2 and adjusting the pressure.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.