CN218912885U

CN218912885U - Advanced support device for airtight joint tunnel

Info

Publication number: CN218912885U
Application number: CN202223136150.4U
Authority: CN
Inventors: 蔡颖; 王轩; 张同桐
Original assignee: Chengdu Engineering Co Ltd of China Railway No 5 Engineering Group Co Ltd
Current assignee: Chengdu Engineering Co Ltd of China Railway No 5 Engineering Group Co Ltd
Priority date: 2022-11-25
Filing date: 2022-11-25
Publication date: 2023-04-25
Anticipated expiration: 2032-11-25

Abstract

The utility model discloses a sealed joint tunnel advance support device, and particularly relates to the technical field of tunnel advance support devices. The support assembly is arranged, the whole design is simple, the structure is reasonable, and the first folding plate rotates along the axis point of the joint of the second folding plate and the connecting rod due to the stress of the second folding plate through the corresponding cooperation of the structures, so that the second folding plate is unfolded, the second reinforcing support plate can displace due to the jacking force caused by the unfolding of the second folding plate, the spacing among the second reinforcing support plate, the first reinforcing support plate and the first folding plate is changed, the small guide pipe can be conveniently installed by workers, and the conditions of large construction angle, crossing of the guide pipe and the like are avoided.

Description

Advanced support device for airtight joint tunnel

Technical Field

The utility model belongs to the technical field of tunnel advance support devices, and particularly relates to a closed joint tunnel advance support device.

Background

In the tunnel excavation process, the rock mass around the excavation surface generally has relatively poor self-stabilization capability, the self-characteristics of the rock mass can be improved by reinforcing the weak surrounding rock, the small-conduit advanced grouting technology is an advanced support method for improving the stability of the surrounding rock, the small-conduit grouting mode is used as one of auxiliary methods for smoothly constructing the tunnel excavation, plays an increasingly important role in the construction process of shallow-buried sections, broken fault sections and other bad geological sections, and particularly plays a role in the treatment of tunnel construction collapse problems, and the support mode can be widely practiced in engineering examples of tunnel excavation due to good economic benefits and flexibility.

The prior art construction conditions are that the construction angle (5-12 ℃) of grouting and leading small guide pipes is particularly specified by the advance support design of the tunnel: 1. because the interval between the steel frames is too small (50 cm-80 cm), after the steel frames are propped against the face as much as possible, the small guide pipe is insufficient in construction space, so that the angle of the small guide pipe does not meet the design requirement, the conditions of large construction angle, crossing guide pipes and the like occur, and the advanced support effect cannot be well achieved.

Disclosure of Invention

The technical scheme of the utility model aims at solving the technical problem that the prior art is too single, provides a solution which is obviously different from the prior art, and provides the advance support device for the closed joint tunnel, so as to solve the problems that the angle of a small conduit does not meet the design requirement, the construction angle is larger, the conduits are crossed and the like due to insufficient construction space of the small conduit after the existing steel frame stand needs to be propped against the face as much as possible, and the advance support effect cannot be well achieved.

The utility model is realized in such a way that the utility model provides the following technical scheme: the advance support device for the airtight joint tunnel comprises a first folding plate, wherein two groups of oppositely arranged support assemblies are arranged on the first folding plate;

the support assembly comprises a first reinforced supporting plate arranged on one side of the top of a first folding plate, a second reinforced supporting plate arranged on one side of the bottom of the first folding plate, and a second folding plate which can be folded is arranged in the first folding plate;

the second reinforcing supporting plate is provided with a sliding groove which is in sliding connection with the second folding plate, the outer side of the first folding plate is provided with a push rod, and the push rod is provided with a connecting rod for supporting the second folding plate;

the utility model discloses a push rod, including the ejector pin, the ejector pin is equipped with the slip ring that can slide on the ejector pin, two equal swing joint has the slipframe on the slip ring, two the slipframe sets up respectively in the outside of first folded sheet, first enhancement layer board and second enhancement layer board and with first folded sheet, first enhancement layer board and second enhancement layer board sliding connection, the top and the bottom of ejector pin all are provided with the pallet block, two all be provided with the guide bar on the pallet block, the cover is equipped with the spring on the guide bar, the one end of spring is provided with the connecting block with guide bar and pallet block sliding connection, the connecting block is installed on the ejector pin and with ejector pin swing joint.

Compared with the prior art, the utility model has the beneficial effects that:

compared with the prior art, the support assembly is simple in overall design and reasonable in structure, and through corresponding matching of all structures, the first folding plate rotates along the axis point of the joint of the second folding plate and the connecting rod due to stress of the second folding plate, so that the second folding plate can be unfolded, the second reinforcing support plate can be displaced due to the jacking force caused by the unfolding of the second folding plate, the distance among the second reinforcing support plate, the first reinforcing support plate and the first folding plate can be changed, small guide pipes can be conveniently installed by workers, and the conditions of overlarge construction angles, crossing of the guide pipes and the like are avoided;

when the second reinforced supporting plate, the first reinforced supporting plate and the first folding plate are unfolded, the sliding frame and the sliding ring are driven to displace, the sliding frame can slide on the first folding plate, the first reinforced supporting plate and the second reinforced supporting plate, the sliding ring can slide on the ejector rod, and the first folding plate, the first reinforced supporting plate and the second reinforced supporting plate are positioned when being unfolded, so that the stability of the sliding frame is improved;

meanwhile, the guide rod is used for guiding the connecting block during displacement, so that the stability of each structure and the ejector rod displacement on the first folding plate is improved, the spring is compressed during the displacement of the connecting block, and the elastic support function of the first folding plate is realized by resetting the connecting block through the elastic drive of the spring.

Drawings

Fig. 1 is a schematic diagram of the overall structure of the present utility model.

Fig. 2 is a side view of the overall structure of the present utility model.

Fig. 3 is a front view of the second folding plate of the present utility model when unfolded.

Fig. 4 is an exploded view of the support assembly of the present utility model.

In the figure: 1. a first folding plate; 2. a first reinforcing pallet; 3. a second reinforcing pallet; 4. a second folding plate; 5. a chute; 6. a push rod; 7. a connecting rod; 8. a slip ring; 9. a sliding frame; 10. a pallet block; 11. a guide rod; 12. a spring; 13. and (5) connecting a block.

Detailed Description

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

In the description of the present utility model, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model. Furthermore, in the description of the present utility model, the meaning of "plurality" is two or two.

The advance support device for the closed joint tunnel shown in the attached drawings 1-4 can adjust the construction space of the small guide pipe through the support component arranged on the first folding plate 1, avoids the conditions of large construction angle, crossed guide pipes and the like, and has the following specific structure;

the support assembly comprises a first reinforced supporting plate 2 arranged on the top side of the first folding plate 1, a second reinforced supporting plate 3 arranged on the bottom side of the first folding plate 1, and a second folding plate 4 which can be folded is arranged in the first folding plate 1;

a sliding groove 5 which is in sliding connection with the second folding plate 4 is formed in the second reinforcing supporting plate 3, a push rod 6 is arranged on the outer side of the first folding plate 1, and a connecting rod 7 for supporting the second folding plate 4 is arranged on the push rod 6;

the ejector rod 6 is sleeved with two sliding rings 8 which can slide on the ejector rod 6, two sliding rings 8 are movably connected with sliding frames 9, two sliding frames 9 are respectively arranged on the outer sides of the first folding plate 1, the first reinforcing supporting plate 2 and the second reinforcing supporting plate 3 and are in sliding connection with the first folding plate 1, the first reinforcing supporting plate 2 and the second reinforcing supporting plate 3, the top and the bottom of the ejector rod 6 are respectively provided with a pallet block 10, guide rods 11 are respectively arranged on the two pallet blocks 10, springs 12 are sleeved on the guide rods 11, one ends of the springs 12 are provided with connecting blocks 13 which are in sliding connection with the guide rods 11 and the pallet blocks 10, and the connecting blocks 13 are arranged on the ejector rod 6 and are movably connected with the ejector rod 6.

According to the above structure, a worker installs the device manufactured by the present utility model at weak surrounding rock of a tunnel, and when in use, the first folding plate 1 supports rock, and the second folding plate 4 rotates along the axial center point of the connection point of the second folding plate 4 and the connecting rod 7 due to stress by applying pressure to the outer side of the second folding plate 4, so that the second folding plate 4 is unfolded;

when the second folding plate 4 is unfolded, the second folding plate 4 is in sliding connection with the second reinforced supporting plate 3 through the sliding groove 5, so that the second reinforced supporting plate 3 can displace due to the jacking force caused by the unfolding of the second folding plate 4, and the spacing among the second reinforced supporting plate 3, the first reinforced supporting plate 2 and the first folding plate 1 can be changed, thereby being convenient for workers to install small guide pipes;

when the second reinforced support plate 3, the first reinforced support plate 2 and the first reinforced support plate 1 are unfolded, the sliding frame 9 and the sliding ring 8 are driven to displace, and the sliding frame 9 which is in sliding connection with the ejector rod 6 is in sliding connection with the first reinforced support plate 1, the first reinforced support plate 2 and the second reinforced support plate 3, so that when the first reinforced support plate 1, the first reinforced support plate 2 and the second reinforced support plate 3 are unfolded, the sliding frame 9 can slide on the first reinforced support plate 1, the first reinforced support plate 2 and the second reinforced support plate 3, the sliding ring 8 can slide on the ejector rod 6, and the first reinforced support plate 1, the first reinforced support plate 2 and the second reinforced support plate 3 are positioned when being unfolded, and the stability of the sliding frame 9 is improved;

and through the use of mutually supporting of pallet piece 10, guide bar 11, spring 12 and connecting block 13, each structure and ejector pin 6 on the convenient first folding board 1 can be through the displacement of connecting block 13 on pallet piece 10 to guide when the displacement of connecting block 13 through guide bar 11, improve each structure and the stability of ejector pin 6 displacement on the first folding board 1, and still can make spring 12 compress when the connecting block 13 displacement, reset through spring 12 self elasticity drive connecting block 13, realize playing the function of elastic support to first folding board 1.

In specific implementation, the steel frame arch part which needs to be provided with the advanced guide pipe is pre-punched in the 120-degree range, the circumferential spacing of punching holes is consistent with the circumferential spacing of the design, and the punching holes are round holes with the size of 50 mm.

In order to ensure that the steel frame structure subjected to the pipe steel frame punching is not lost in stress, a punching part is welded and reinforced by adopting a punching steel plate, the steel plate is a 16mm thick steel plate, the length and the width of the steel plate are 150mm, and the center of the steel plate is provided with a hollow with the diameter of 50 mm.

The advanced small guide pipe does not need to be perforated to be provided with a slurry overflow hole, grouting filling is carried out on the small guide pipe with the designed length in advance, and the small guide pipe can be sent into the field tunnel face to serve as a semi-finished product after the slurry strength reaches the standard. After the tunnel face is erected and the last steel frame is a steel frame which is pre-punched and reinforced by a steel plate, after the advanced drilling is finished, the explosive roll is fed into the hole, the anchoring length is met, and then the pre-processed small-catheter semi-finished product is jacked into the hole from the punching position.

The tail end of the advance small guide pipe is welded with the steel frame by adopting L-shaped phi 16 steel bars, the sizes of the L bars are 10cm x 10cm, and 2L bars are arranged at the tail end of each small guide pipe and are arranged left and right.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

Claims

1. The utility model provides a airtight joint tunnel advance support device, includes first folded sheet, its characterized in that: two groups of oppositely arranged support components are arranged on the first folding plate;

the second reinforcing support plate is provided with a sliding groove which is in sliding connection with the second folding plate, the outer side of the first folding plate is provided with a push rod, and the push rod is provided with a connecting rod for supporting the second folding plate.

2. The advanced support device for a closed joint tunnel according to claim 1, wherein: the two sliding rings capable of sliding on the ejector rod are sleeved on the ejector rod, and the two sliding rings are movably connected with sliding frames.

3. The advanced support device for the closed joint tunnel according to claim 2, wherein: the two sliding frames are respectively arranged on the outer sides of the first folding plate, the first reinforced supporting plate and the second reinforced supporting plate and are in sliding connection with the first folding plate, the first reinforced supporting plate and the second reinforced supporting plate.

4. The advanced support device for a closed joint tunnel according to claim 1, wherein: the top and the bottom of ejector pin all are provided with the pallet piece, two all be provided with the guide bar on the pallet piece.

5. The advanced support device for a closed joint tunnel according to claim 4, wherein: the guide rod is sleeved with a spring, and one end of the spring is provided with a connecting block which is in sliding connection with the guide rod and the supporting plate block.

6. The advanced support device for a closed joint tunnel according to claim 5, wherein: the connecting block is arranged on the ejector rod and is movably connected with the ejector rod.