CN214145514U - Advance support reinforcement system for tunnel - Google Patents

Abstract

The embodiment of the utility model discloses advance support reinforcerment system for tunnel, it includes: the tunnel structure comprises a deep hole grouting reinforcement layer, wherein the deep hole grouting reinforcement layer is arranged on an un-excavated tunnel face of a tunnel, a plurality of grouting holes are uniformly distributed in the deep hole grouting reinforcement layer, and a plurality of small advanced guide pipes are distributed in the deep hole grouting reinforcement layer. The utility model discloses preceding can enough the influence of effectual control building on every side can make tunnel safe excavation again, can also prevent effectively at deep hole slip casting in-process and leak thick liquid phenomenon.

Description

Advance support reinforcement system for tunnel

Technical Field

The utility model relates to a tunnel excavation technical field especially relates to a tunnel is with advance support reinforcerment system.

Background

At present, the construction of subway tunnels is gradually increased, the subway construction becomes a key project of a city, in the subway construction process, due to the fact that a plurality of buildings exist above a city road surface, certain difficulty is brought to the excavation of the subway tunnels, particularly when the subway passes through a bridge in the excavation process under unfavorable geology, the excavation difficulty is more difficult, and tunnel advance support also becomes a key point of tunnel excavation. The general supporting scheme usually uses a conventional small conduit to perform advanced reinforcement in a certain range of the tunnel, or reinforces rock mass around the tunnel by a deep hole grouting mode, or reinforces by an isolation pile when passing through a bridge pile section on the side of the tunnel. Meanwhile, the slurry leakage phenomenon is easy to occur during deep space grouting, and during grouting, the whole grouting is generally performed at one time. However, the single reinforcing mode is not enough to ensure the safe excavation of the tunnel, and the efficiency is poor due to slurry leakage during deep hole grouting, the permeability of the whole grouting at one time is poor, and the efficiency is low.

At present, no advanced reinforcement system can effectively control the influence of surrounding buildings, can ensure safe excavation of tunnels, and can effectively prevent the phenomenon of slurry leakage in the process of deep hole grouting.

SUMMERY OF THE UTILITY MODEL

Based on this, for solving the not enough that prior art exists, specially proposed a advance support reinforcerment system for tunnel.

A kind of tunnel uses the forepoling reinforcing system, characterized by comprising: the tunnel structure comprises a deep hole grouting reinforcement layer, wherein the deep hole grouting reinforcement layer is arranged on an un-excavated tunnel face of a tunnel, a plurality of grouting holes are uniformly distributed in the deep hole grouting reinforcement layer, and a plurality of small advanced guide pipes are distributed in the deep hole grouting reinforcement layer.

Optionally, in one embodiment, the system further includes a controllable slurry stopping device, and the controllable slurry stopping device includes: the grouting pipe, the grout stopping structure and the double-liquid mixing structure; the pipe wall of one side of the grouting pipe extending into the grouting hole is provided with a plurality of grouting spray holes to form a grouting spray head; the grout stopping structure is arranged on the outer diameter of the grouting pipe; the double-liquid mixing structure is connected with at least two grouting liquid conveying pipelines and mixes the grouting liquids.

Optionally, in one embodiment, the two-liquid mixing structure comprises a plurality of slurry delivery pipes and a mixer; each slurry conveying pipe is arranged on the other side of the grouting pipe, and the mixer is arranged in the grouting pipe.

Optionally, in one embodiment, the grout stopping structure comprises a pulling plate structure, a transmission rod and a grout stopping disc; one end of the transmission rod is fixed on the pull plate structure, and the other end of the transmission rod is connected with the grout stopping disc.

Optionally, in one embodiment, the grout stopping disk comprises: a plurality of mutually spaced sector structures, a plurality of bent pipe structures, a plurality of inserting structures and a grout stopping sleeve; the bent pipe structures are fixed on the outer diameter of the grouting pipe; the bottom end of the sector structure is arranged on the elbow structure through an inserting structure, and the top end of the sector structure generates displacement along with the pulling of the transmission rod; the grout stopping sleeve is an elastic element and comprises a first grout stopping sleeve coated on each sector structure and a second grout sleeve sleeved on the outer diameter of the grouting pipe.

Optionally, in one embodiment, the insertion structure includes a spring assembly, an insertion strip and a sleeve, which are oppositely disposed at the bottom end of the sector structure; the cutting is arranged on the spring assembly, and the sleeve is sleeved on the cutting.

Optionally, in one embodiment, the first grout sleeve and the second grout sleeve are of an integral structure.

Implement the embodiment of the utility model provides a, will have following beneficial effect:

the utility model designs a forepoling reinforcerment system for tunnel, which can not only ensure the stability of surrounding buildings, but also ensure the safe excavation of the tunnel, and can prevent the slurry leakage and inject the rock mass in sections when grouting in deep space; adopt simultaneously steerable thick liquid device of ending can effectively prevent the emergence of leaking thick liquid, but also segmentation injection thick liquid prevents that the slip casting from appearing the permeability poor, leak the problem of notes etc..

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Wherein:

FIG. 1 is a schematic diagram of the system with grouting holes according to one embodiment;

FIG. 2 is a schematic diagram of the corresponding structure of the system in one embodiment with a small lead catheter;

FIG. 3 is a simplified schematic diagram of a corresponding configuration of the system in one embodiment;

FIG. 4 is a schematic diagram of a WSS deep hole grouting longitudinal section corresponding to the system in one embodiment;

FIG. 5 is a schematic longitudinal sectional view of a corresponding grout stop structure of the system in an embodiment located in a grouting hole;

FIG. 6 is a schematic diagram of a slurry stop structure corresponding to the system in one embodiment;

FIG. 7 is a schematic diagram illustrating a side view of a grout stop structure of the system according to one embodiment;

FIG. 8a is a partial schematic diagram of the inner diameter of the grout stopping disk on the grouting pipe corresponding to the system in one embodiment;

FIG. 8b is a schematic view of a stop plate configuration corresponding to the system in one embodiment;

FIG. 9a is a schematic view of a sector structure of the system according to an embodiment shown without installation;

FIG. 9b is a schematic view of a corresponding sector structure of the system in an embodiment after installation;

FIG. 10a is a schematic view of a fan configuration and a drive link configuration of an embodiment of the system after installation;

FIG. 10b is a schematic view of the drive link of FIG. 10 a;

FIG. 10c is a schematic view of the sector structure of FIG. 10 a;

in the figure: 1. the structure comprises an advanced small guide pipe, 2, a primary lining structure, 3, a middle partition board, 4, a middle partition wall and 5. a grouting hole, 6, a grout stopping structure, 7, a grouting pipe, 71, a conveying pipeline of grouting liquid A, 72, a conveying pipeline of grouting liquid B, 8, a grout stopping disc, 9, a transmission rod, 10, a pulling plate structure, 11, a connecting part of the transmission rod and a sector structure, 12, a sector structure, 13, a bent pipe structure, 14 and a sleeve pipe, namely a sector bent pipe; 15. the device comprises a cutting, 16, a spring assembly, 17, a grouting jet hole, 18, a mixer, 19, a grout stopping sleeve, 191, a first grout sleeve, 192 and a second grout sleeve.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in 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.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present application. The first and second elements are both elements, but they are not the same element.

In view of the fact that in the prior art, when a large number of buildings and bridges are arranged around the poor geology to perform tunnel excavation, the tunnel excavation is mainly reinforced through advanced small conduits or deep hole grouting, or isolation piles are adopted in the process of penetrating bridge piles, the general reinforcing system cannot effectively control the influence on the surrounding buildings and the safety of the tunnel excavation, and the problems that slurry leakage occurs in the process of adopting the deep hole grouting, slurry cannot be injected in a segmented mode in the injection process and the like can be solved. The utility model discloses a leading support reinforcerment system for tunnel, its application is in according to certain mode of arranging and different angles for utilizing WSS worker method earlier carry out deep hole slip casting like figure 1 around 180 tunnel face top, beat according to certain mode afterwards and establish one row of leading slip casting tubule like figure 2, then this kind of leading tubule and deep hole slip casting system according to certain mode arrangement can effectual control influence of building and earth's surface around, furthest protection tunnel safety excavation.

Specifically, in this embodiment, a system for reinforcing a tunnel by advance support is specifically provided, as shown in fig. 3, which includes: the tunnel comprises a deep hole grouting reinforcement layer, wherein the deep hole grouting reinforcement layer is arranged on an un-excavated tunnel face of a tunnel, a plurality of grouting holes 5 are uniformly distributed in the deep hole grouting reinforcement layer, and a plurality of advanced small guide pipes 1 are distributed in the deep hole grouting reinforcement layer. Carry out first lining cutting structure 2 construction after the advance support reinforcerment system for tunnel accomplishes, set up mid-board 4 and intermediate bottom 3 in first lining cutting structure 2.

In some specific embodiments, the system further comprises a controllable grout stopping device 6, which is used for injecting more than two grouting grouts into the grouting hole 5, and comprises: the grouting pipe 7, the grout stopping structure 6 and the double-liquid mixing structure; the wall of the side of the grouting pipe 7 extending into the grouting hole 5 is provided with a plurality of grouting spray holes 17 to form a grouting spray head; the grout stopping structure 6 is arranged on the outer diameter of the grouting pipe 7; the double-liquid mixing structure is connected with at least two grouting liquid conveying pipelines and mixes the grouting liquids. The controllable grout stopping device is in butt joint with the two-liquid grouting pipe, grouting grout stopping effect can be achieved after grouting is completed, the grouting grout stopping device is pulled towards the outer side of the hole after a section of grouting is completed, and then the grouting grout stopping device is pushed tightly again after reaching a designated position.

In some embodiments, the two-fluid mixing structure includes a plurality of grout lines (e.g., a line 71 for a grouting fluid and a line 72 for a grouting fluid) and a mixer 18; each slurry conveying pipe is arranged on the other side of the grouting pipe, and the mixer is arranged in the grouting pipe. Preferably the mixer is a slurry mixing device having a paddle type.

In some specific embodiments, as shown in fig. 5-10, the grout stopping structure 6 comprises a pulling plate structure 10, a transmission rod 9 and a grout stopping disk 8; one end of the transmission rod 9 is fixed on the pulling plate structure 10, and the other end of the transmission rod is connected with the grout stopping disc 8. Preferably, the pulling plate structure is circular and is sleeved on the outer diameter of the double-liquid grouting pipe. Two transmission rods 10 (iron brace is adopted in the embodiment) are welded on the left side and the right side of the middle part of each fan blade, and the other end of the welded iron brace is welded with a pulling plate structure.

In some specific embodiments, the grout stopping disk 8 comprises: a plurality of mutually spaced sector structures 12, a plurality of bent pipe structures 13, a plurality of inserting structures and a grout stopping sleeve 19; the bent pipe structures are fixed on the outer diameter of the grouting pipe; the bottom end of the sector structure 12 is arranged on the elbow structure through an inserting structure, and the top end of the sector structure is displaced relative to the bottom end along with the pulling of the transmission rod 10; the grout stopping sleeve 19 is an elastic element and comprises a first grout stopping sleeve 191 covering each sector structure and a second grout stopping sleeve 192 sleeved on the outer diameter of the grouting pipe. Preferably, the number of the sector structures is six, the sector structures are spliced together to form a circular ring structure, the inner diameter of the circular ring structure is slightly larger than the outer diameter of the grouting pipe, and the outer diameter of the circular ring structure is slightly smaller than the aperture of the grouting hole. Preferably, the arc edge of the sector structure is welded with a transverse arc iron sheet, so that six fan blades form an annular slurry stopping disc. Preferably, the elbow structure is arranged along the pipe diameter of the grouting pipe, the number of the elbow structure is six, the elbow structure is welded at a position where the double-liquid grouting pipe is away from the grouting spray head by a certain distance, such as about 10cm, and the elbow manufacturing requirement can be met at the sector elbow connector. In addition, the connection 11 between the transmission rod and the sector structure may be welded or connected by a spring.

In some specific embodiments, the plugging structure includes a spring assembly 16, a plug strip 15 and a sleeve 14 (which may also be referred to as a sector elbow) oppositely disposed at the bottom end of the sector structure; the cutting is arranged on the spring assembly, and the sleeve is sleeved on the cutting. Preferably, the sleeve is welded with two sides of the lower arc-shaped edge of the sector, the spring assembly and the inserting bar are arranged in the sleeve, the spring assembly and the inserting bar are welded together, and the bottom of the sector elbow is welded on the other side of the spring. The elbow welded on the double-liquid grouting pipe is in butt joint with the sector elbow, so that the inserting strip is contracted by virtue of the spring to complete the butt joint of the sector elbow and the elbow structure on the double-liquid grouting pipe, and the self-drawing type grout stopping disc is manufactured after all six sector structures are in butt joint.

In some specific embodiments, the grout sleeve is an elastic rubber element which comprises a first grout sleeve and a second grout sleeve which is integrated with the first grout sleeve; the first grout sleeve can completely cover the grout stopping disc at least relative to one side of the grouting spray head, the other side of the first grout sleeve covers the edge of the grout stopping disc, and the second grout sleeve is sleeved on the outer diameter of the grouting pipe and the joint of the grouting pipe and sealed by a sealant or a sealing ring. The grout stopping sleeve is arranged to match with the grout stopping disk to prevent the lateral leakage of grout.

The utility model discloses a concrete working process includes:

1. before grouting and distributing points, a net is hung and concrete is sprayed to seal the tunnel face so as to prevent slurry leakage.

2. Firstly, carrying out WSS deep hole grouting drilling, wherein the drilling positions are four rows in the example shown in FIG. 4, the number of holes of a first ring L1 is 9, the external insertion angle is 16 degrees, the length of a grouting pipe is 8.35m, the distance between pipes is 0.899m, the number of holes of a second ring L2 is 10, the external insertion angle is 13 degrees, the length of the grouting pipe is 13.37m, the distance between pipes is 0.799m, the number of holes of a third ring L3 is 9, the external insertion angle is 11 degrees, the length of the grouting pipe is 15.3m, the distance between pipes is 0.6m, the number of holes of a fourth ring L4 is 7, the external insertion angle is 10 degrees, the length of the grouting pipe is 15.26m, the distance between pipes is 0.5m, and the distances from the first ring L1 to the fourth ring L4 are 0.6m, 0.5m, 0.7m and 0.775m respectively; the deep hole grouting range is 180 degrees of a certain height of the tunnel, and a drilling machine is used; in addition, the reference numerals in the figures mean: G. grouting range line, H, reinforcement range; E. f, the length of an excavated segment, I, the cycle length, M, an excavated outline, N, a step excavation line, and O, grouting requirements: closed grouting on the palm surface, quincunx staggered arrangement and the like.

3. And after drilling is finished, strictly controlling the drawing speed, drawing at a constant speed, wherein the drawing speed is not more than 200mm each time. The drawn drill rod is cleaned in time for later use.

4. And proportioning the grout, and grouting by adopting double-grout (A grouting liquid and B grouting liquid).

5. The controllable grout stopping device is placed in the grouting hole, and then the structure of the grout stopping plate is pushed and pulled by hands, so that the grout stopping plate is tightly attached to the rock wall without a gap.

6. During grouting, the liquid A and the liquid B enter the mixer through the corresponding injection pipes or the conveying pipes chariot, and after being fully mixed by the mixer, the mixed liquid enters the pipe body and is sprayed out from the grouting nozzles.

7. After a section of grout is injected, the pulling plate structure is pulled outwards outside the hole by hand, and after a section of grout is injected, the pulling plate structure is pushed inwards by a handle after a section of grout is pulled, so that the grout stopping disc is driven to be tightly attached to the bunker, and the grouting is repeated in a circulating mode until the grouting of one grouting hole is completed.

8. And after the controllable grout stopping device is cleaned, the controllable grout stopping device enters the next grouting hole for grouting in the same way until all the grouting holes are finished.

9. And inserting a grouting pipe into the drilled hole, strictly controlling the grouting amount, the drawing speed and the grouting pressure of each hole, and controlling the grouting pressure (final pressure value) according to the hydrostatic pressure of the grouting part plus 1-1.5 MPa. The grouting is closely concerned with the flow rate of the slurry, and the grouting is stopped immediately when the pressure is suddenly increased and decreased and the slurry overflows. Finding out the abnormal reason, and adopting necessary measures (adjusting grouting parameters, shifting, drilling inclined holes and the like) to continue grouting. The grouting mode is that the inner ring is firstly arranged and then the outer ring is arranged at intervals, the backward grouting mode is adopted for grouting, and the backward distance and the backward speed are strictly controlled.

10. After the WSS deep hole grouting is completed and the interior is reinforced, the advanced small guide pipe construction is carried out, firstly, a drilling machine is used for drilling holes, the position of the small guide pipe is firstly released, and a pneumatic drill is used as power to jack the small guide pipe in by using a special jacking head; the tail part of the small conduit is arranged at the abdomen of the steel frame, so that the common supporting capability is increased. And sealing the hole opening outside the small guide pipe by using plastic cement after the small guide pipe is installed.

In addition, in the present embodiment, a sealing operation is performed, and before grouting, concrete with a thickness of 5-10 cm is sprayed to seal the working surface to prevent leakage of the grout. Grouting: grouting by using an KBY-50/70 grouting machine, and controlling the grouting time by adopting a double-control principle of grouting amount and grouting pressure.

Based on the above technical scheme, the utility model has the advantages that: firstly, WSS deep hole grouting and advanced small guide pipe common grouting reinforcement are adopted, influence can be effectively controlled in unfavorable geology and areas with a large number of buildings around, and tunnel excavation can be safely carried out. Secondly, the internal cracks of the rock can be filled more fully and effectively in the unfavorable geological region, the rock stratum can be reinforced more quickly and effectively, and meanwhile, a similar shell structure can be formed after the small guide pipes are arranged in advance, so that the rock mass around the tunnel is further reinforced; and thirdly, when the system is applied to the tunnel with the side-penetrated bridge pile, the system can be directly reinforced by the system without an isolation pile, so that the time and the labor are saved, and the economy is saved. Finally, when the system is used for grouting in the deep hole, the slurry leakage phenomenon can be effectively prevented, and sectional retreating grouting can be realized.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (7)

1. A kind of tunnel uses the forepoling reinforcing system, characterized by comprising: the tunnel construction method comprises the following steps that a deep hole grouting reinforcement layer is arranged on an un-excavated tunnel face of a tunnel, a plurality of grouting holes are uniformly distributed in the deep hole grouting reinforcement layer, and a plurality of small advanced guide pipes are distributed in the deep hole grouting reinforcement layer; the system also includes a controllable grout stopping device, the controllable grout stopping device comprising: the grouting pipe, the grout stopping structure and the double-liquid mixing structure; the pipe wall of one side of the grouting pipe extending into the grouting hole is provided with a plurality of grouting spray holes to form a grouting spray head; the grout stopping structure is arranged on the outer diameter of the grouting pipe; the double-liquid mixing structure is connected with at least two grouting liquid conveying pipelines and mixes the grouting liquids.

2. The forepoling reinforcement system for tunnels of claim 1, wherein the two-fluid mixing structure comprises a plurality of grout pipes and a mixer; each slurry conveying pipe is arranged on the other side of the grouting pipe, and the mixer is arranged in the grouting pipe.

3. The advance support reinforcement system for the tunnel according to claim 1, wherein the grout stopping structure comprises a pulling plate structure, a transmission rod and a grout stopping disc; one end of the transmission rod is fixed on the pull plate structure, and the other end of the transmission rod is connected with the grout stopping disc.

4. The advance support reinforcement system for tunnels of claim 3, wherein the grout stopping disk comprises: a plurality of mutually spaced sector structures, a plurality of bent pipe structures, a plurality of inserting structures and a grout stopping sleeve; the bent pipe structures are fixed on the outer diameter of the grouting pipe; the bottom end of the sector structure is arranged on the elbow structure through an inserting structure, and the top end of the sector structure generates displacement along with the pulling of the transmission rod; the grout stopping sleeve is an elastic element and comprises a first grout stopping sleeve coated on each sector structure and a second grout sleeve sleeved on the outer diameter of the grouting pipe.

5. The forepoling reinforcement system for tunnels of claim 4, wherein the plugging structure comprises a spring assembly, a slip and a sleeve oppositely arranged at the bottom end of the sector structure; the cutting is arranged on the spring assembly, and the sleeve is sleeved on the cutting.

6. The forepoling reinforcement system for tunnels according to claim 4, wherein the first grout sleeve and the second grout sleeve are of an integral structure.

7. The advance support reinforcement system for the tunnel according to claim 4, wherein the number of the sector structures is six, the sector structures are combined together to form a circular ring structure, the inner diameter of the circular ring structure is larger than the outer diameter of the grouting pipe, and the outer diameter of the circular ring structure is smaller than the aperture of the grouting hole.

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