Tunnel cave edge sealing device and construction method thereof

Abstract

The application discloses a tunnel cave edge sealing treatment device and a construction method thereof. The device comprises a lower sleeve, a separation net and an opening structure. The lower sleeve is used for being inserted into a cave edge sealing hole. Opposite sides of the lower sleeve are provided with opening grooves. The separation net is used for opening and sealing a cave boundary. The separation net is arranged in the lower sleeve. The opening structure is used for opening the separation net outward from the opening grooves. The opening structure is arranged in the lower sleeve, and the top of the opening structure is arranged to extend out of the lower sleeve. The device is lowered into the edge sealing hole, and after being opened, the device is overlapped to form a net structure, so that the cavities in the treatment range of the cave are isolated to form a closed space. Then, material is poured and grouting is performed in the closed space, which can effectively save the treatment materials and cost of the cave, shorten the construction period, ensure that the pouring and grouting do not flow with underground water after the edge sealing, significantly improve the filling density and grouting effect, and has simple structure and convenient installation and construction.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tunnel construction, in particular to a tunnel karst cave edge sealing treatment device and a construction method thereof. BACKGROUND

[0002] In recent years, tunnel construction in China is in full swing and gradually develops in complex geological conditions; a batch of tunnel construction is in the area where karst caves develop, which faces the problems of few treatment methods, poor treatment effect, great treatment difficulty and high construction cost. When treating unfilled caves (empty caves) by traditional methods, the method of pouring material first and then grouting is used for treatment, which is affected by the uncertainty of the scope of the cave, the part of the cave exceeding the tunnel boundary and the flow of underground water, etc., so that the filling and grouting amount is large, the filling effect is poor, and the effect of water stopping and plugging cannot be achieved; further leading to the phenomenon of seepage water in the tunnel structure during tunnel excavation construction due to excessive grouting amount and poor grouting effect.

[0003] For example, a karst grouting construction method disclosed in Chinese patent CN 114183170 A includes the following steps: preparation for karst grouting construction; determining filling materials and grouting materials and construction methods according to basic parameters of the cave revealed by drilling; judging and determining whether the tunnel needs to be pretreated according to the location of the environment where the tunnel is located; preparing the slurry according to the determined filling materials and grouting materials; performing grouting treatment; and detecting the karst grouting treatment structure. The filling and grouting amount is large, the construction period is long, the construction cost is high, and the stability is poor due to the influence of underground water flow. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a tunnel karst cave edge sealing treatment device and a construction method thereof, which can effectively save karst cave treatment materials and cost and shorten the construction period.

[0005] To solve the above technical problems, the technical scheme adopted by the present application is as follows:

[0006] A tunnel karst cave edge sealing treatment device comprises:

[0007] A lower casing pipe is used for inserting into a karst cave edge hole, and opposite sides of the lower casing pipe are provided with opening grooves;

[0008] An isolation net is used for opening and closing the boundary of the karst cave, and the isolation net is arranged in the lower casing pipe;

[0009] An opening structure is used for opening the isolation net outward from the opening grooves, and the opening structure is arranged in the lower casing pipe and the top of the opening structure is arranged to protrude from the lower casing pipe.

[0010] Further comprising a wall protection casing pipe arranged above the karst cave edge hole, and the outer diameter of the lower casing pipe is smaller than the inner diameter of the wall protection casing pipe.

[0011] The isolation net is a dense-mesh isolation net.

[0012] The opening structure comprises a transmission rod and a pair of opening rods, the lower part of the transmission rod is hingedly connected to the inner side of the opening rod on the corresponding side through a linkage rod, and the isolation net is sleeved on the pair of opening rods.

[0013] The lower sleeve is a cylindrical tube, and the height of the opening groove is consistent with the height of the boundary of the karst cave.

[0014] The number of layers of the dense-mesh isolation net is two or more.

[0015] A positioning groove for inserting and positioning the positioning rod is arranged on the top of the transmission rod.

[0016] The opening rod comprises oppositely arranged upper opening rods and lower opening rods, the upper opening rods and the lower opening rods are both two, the two lower opening rods are hingedly connected to the lower part of the transmission rod through the linkage rods on the corresponding sides, the upper opening rods are located outside the lower opening rods, the lower ends of the upper opening rods are hingedly connected to the lower end of the lower sleeve, the top of the two upper opening rods is provided with an inwardly extending inner extension, and the transmission rod is provided with a limiting plate for pressing down the inner extension.

[0017] A lifting ring for positioning the upper opening rod is arranged on the inner wall of the upper part of the lower sleeve.

[0018] A method for processing the edge of a tunnel karst cave comprises the following steps:

[0019] 1) First, construct a boundary hole to determine the range of the karst cave;

[0020] 2) Construct a row of edge holes on the boundary line of the tunnel karst cave, and lower the wall sleeve to the top of the edge hole;

[0021] 3) Lower the edge processing device, and push the opening rod to make the dense-mesh isolation net open;

[0022] 4) After the dense-mesh isolation net is opened, the dense-mesh isolation nets are overlapped with each other;

[0023] 5) The position of the dense-mesh isolation net is fixed by pouring the material into the dense-mesh isolation net through the edge hole;

[0024] 6) Construct a pouring hole and a grouting hole in the tunnel boundary, first pour the material to fill the closed space formed by the edge net and the karst cave boundary, and then grout to make the karst cave compact.

[0025] Compared with the prior art, the present application has the following advantages:

[0026] The tunnel karst cave sealing device and its construction method are reasonably designed. The device is placed inside the sealing hole, and after opening, they overlap to form a mesh structure, isolating the cavities within the karst cave treatment area into a closed space. Then, material is first put into the closed space and then grout is injected for sealing. This can effectively save karst cave treatment materials and costs, and shorten the construction period. Secondly, after sealing, it can ensure that the material and grout do not flow with the groundwater, which significantly improves the filling density and grouting effect. Moreover, the device has a simple structure and is easy to install and construct. Attached Figure Description

[0027] The following is a brief explanation of the contents of each of the accompanying drawings and the markings in the drawings:

[0028] Fig. 1 This is a schematic diagram of the processing device of the present invention.

[0029] Fig. 2 This is a schematic diagram of the edge sealing structure of the present invention.

[0030] Fig. 3 This is a schematic diagram of the unfilled karst cave treatment method of the present invention.

[0031] Fig. 4 This is a flowchart of the edge sealing construction method of the present invention.

[0032] In the picture:

[0033] 1. Transmission rod, 2. Lower sleeve, 3. Upper opening rod, 4. Lower opening rod, 5. Isolation net, 6. Protective sleeve, 7. Void, 8. Overlap area, 9. Sealing filler, 11. Positioning groove, 12. Limiting plate, 13. Linkage rod, 14. Rotating shaft, 21. Lifting ring, 22. Pin, 24. Opening groove. Detailed Implementation

[0034] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and through the description of the examples.

[0035] like Figs. 1 to 4 As shown, the tunnel karst cave sealing device includes a lower sleeve 2, an isolation net 5, and an opening structure. The lower sleeve 2 is used to insert into the karst cave sealing hole, and opening grooves 24 are provided on both opposite sides of the lower sleeve. The isolation net 5 is used to open and close the boundary of the karst cave, and the isolation net is located in the lower sleeve. The opening structure is used to open the isolation net outward from the opening groove, and the opening structure is located in the lower sleeve, with the top of the opening structure extending out of the lower sleeve.

[0036] Furthermore, the device of the present invention also includes a protective sleeve 6, which is disposed above the sealing hole of the karst cave. The outer diameter of the lower sleeve is smaller than the inner diameter of the protective sleeve, which facilitates the placement of the processing device of the present invention into the sealing hole and makes the operation simple.

[0037] Preferably, the opening structure comprises a transmission rod 1 and a pair of opening rods, the lower part of the transmission rod is hingedly connected to the inner side of the opening rod on the corresponding side through a linkage rod 13 on each side, and the isolation net is sleeved on the pair of opening rods; the opening rod comprises oppositely arranged upper opening rods 3 and lower opening rods 4, both of which are two, the two lower opening rods are hingedly connected to the lower part of the transmission rod through a rotating shaft 14 on the corresponding side, the upper opening rod is located outside the lower opening rod, the lower end of the upper opening rod is hingedly connected to the lower end of the lower sleeve through a pin shaft 22, the top of the two upper opening rods is provided with an inwardly extending inner extension, and the transmission rod is provided with a limiting plate 12 for pressing the inner extension downward.

[0038] Further, the top of the transmission rod is provided with a positioning groove 11 for inserting and positioning the positioning rod, and the inner wall of the upper part of the lower sleeve is provided with a lifting ring 21 for positioning the upper opening rod, so that the operation is stable and reliable.

[0039] The lower sleeve is a cylindrical pipe, the height of the opening groove is consistent with the height of the boundary of the karst cave, and the material of the lower sleeve includes but is not limited to PVC pipe and metal pipe; the opening groove is opened in the height of the karst cave, serving as an opening channel for the L-shaped upper opening rod, the lower opening rod and the dense-mesh isolation net.

[0040] The isolation net 5 is a dense-mesh isolation net, the number of layers of the dense-mesh isolation net is two or more, and the material of the isolation net is not limited to nylon, polyethylene, polyester, polyvinylidene chloride and the like, and the mesh number is ensured to prevent sand particles in the filling material from passing through the dense-mesh net.

[0041] The steps of the tunnel karst cave edge sealing treatment construction method are as follows: 1) first, a boundary hole is constructed to determine the range of the karst cave; 2) a row of edge sealing holes is constructed on the boundary line of the tunnel, and a sleeve pipe is lowered to the top of the cavity 7; 3) the edge sealing device is lowered, and the dense-mesh isolation net is opened by pushing the opening rod; 4) the edge sealing device is sequentially lowered in the edge sealing hole, and the dense-mesh isolation net is fixed in position after being opened and overlapped; 5) the material is poured into the dense-mesh isolation net to a position below the dense-mesh isolation net, so that the position of the dense-mesh isolation net is fixed; 6) a pouring hole and a grouting hole are constructed in the boundary of the tunnel, the closed space formed by the edge sealing net and the boundary of the karst cave is first filled with the material, and then grouting is performed to make the karst cave compact. The device has the advantages of simple structure, convenient installation, adoption of the method of sealing the edge first and then treating, effective saving of karst cave treatment materials, improvement of grouting effect, significant shortening of construction period, and high popularization and application value.

[0042] Preferably, the specific example is as follows:

[0043] The transmission rod is arranged to the ground, the top is provided with a U-shaped positioning groove, the lower sleeve is provided with a limiting plate, a lower transmission rod and a rotating shaft. The lower sleeve is provided with a slot in the height of the karst cave, an L-shaped upper opening rod is fixed through a lifting ring, the bottom is designed as a triangular pyramid, and a rotating shaft is arranged to connect the lower opening rod; a dense mesh isolation net is arranged on the upper opening rod and the lower opening rod, and the lower opening rod is connected with the transmission rod through a linkage rod. When the L-shaped upper opening rod, the lower opening rod and the dense mesh isolation net are not opened, they are retracted in the lower sleeve, and after being opened, the dense mesh isolation nets are overlapped to form an isolation.

[0044] After the edge hole construction is completed, the protection wall sleeve is lowered to the top of the karst cave, and then the karst cave edge device is lowered in the protection wall sleeve hole. The transmission rod is pushed to move downwards, the limiting plate abuts against the short side of the upper L-shaped opening rod, so that the long side of the L-shaped opening rod is opened outwards from the opening slot; at the same time, the lower transmission rod pushes the lower opening rod to open outwards around the rotating shaft. After the L-shaped upper opening rod, the lower opening rod and the dense mesh isolation net are completely opened, the U-shaped positioning groove is clamped with the positioning steel bar, so that the position of the transmission rod is fixed.

[0045] The edge holes are constructed in sequence, the protection wall sleeve is lowered, the edge device is lowered and the dense mesh isolation net is opened to overlap each other to form an overlapping area 8. After the construction of all the edge holes on the red line of the tunnel structure boundary is completed and the edge device is opened, the edge filling material 9 is slowly poured into the karst cave through the hole, until the bottom of the edge device, so that the position of the dense mesh isolation net is fixed, and the karst caves on both sides of the red line of the tunnel structure boundary are isolated.

[0046] Compared with the prior art, the present application has the following advantages:

[0047] (1) The filling-free karst cave edge device of the present application, the opening rod and the edge net are customized according to the depth and height of the karst cave, which has simple structure, is easy to manufacture, and can be applied to karst caves with different depths and heights. (2) The construction method of the present application first lowers the edge device to isolate the karst cave into a closed space, and then pours material and grouts in the closed space; it effectively saves the use of karst treatment materials, significantly shortens the construction period; secondly, after the edge is closed, the pouring and grouting are ensured not to flow with underground water, which significantly improves the filling density and grouting effect. (3) The present application can promote the development of tunnel design and construction under karst geological conditions.

[0048] The above is only a description of the preferred embodiments of the present application, and the above technical features can be arbitrarily combined to form multiple embodiments of the present application.

[0049] The above has described the present application in an exemplary manner in combination with the drawings, and it is obvious that the specific implementation of the present application is not limited by the above manner, as long as various non-essential improvements are made by adopting the concept and technical scheme of the present application, or the concept and technical scheme of the present application is directly applied to other occasions without improvement, which is within the protection scope of the present application.

Claims

1. A tunnel cave edge sealing device, characterized by: The utility model relates to a sealing device for sealing karst cave, comprising: a lower sleeve for inserting into the sealing hole of karst cave, the lower sleeve is provided with a slot on each side; a barrier net for opening the boundary of karst cave, the barrier net is arranged in the lower sleeve; an opening structure for opening the barrier net outward from the slot, the opening structure is arranged in the lower sleeve, and the top of the opening structure extends out of the lower sleeve; wherein, the opening structure comprises a transmission rod and a pair of opening rods, the lower part of the transmission rod is connected with the inner side of the corresponding opening rod through a linkage rod on each side, and the barrier net is sleeved on the pair of opening rods; the opening rod comprises oppositely arranged upper opening rods and lower opening rods, and each of the upper opening rods and the lower opening rods has two, the two lower opening rods are connected with the lower part of the transmission rod through the linkage rod on each side, the upper opening rod is located on the outer side of the lower opening rod, the lower end of the upper opening rod is connected with the lower end of the lower sleeve through a hinge, the top of each of the two upper opening rods is provided with an inwardly extending inner extension, and the transmission rod is provided with a limiting plate for pressing the inner extension.

2. The device for sealing the end of a tunnel cave according to claim 1, characterized in that: Further comprising a wall protection sleeve, the wall protection sleeve is arranged above the sealing hole of karst cave, and the outer diameter of the lower sleeve is smaller than the inner diameter of the wall protection sleeve.

3. The device of claim 1, wherein: The barrier net is a dense-mesh barrier net.

4. The method of claim 2, wherein: The lower sleeve is a cylindrical tube, and the height of the slot is consistent with the height of the boundary of karst cave.

5. The method of claim 3, wherein: The dense-mesh barrier net has more than two layers.

6. The device of claim 1, wherein: The top of the transmission rod is provided with a positioning slot for inserting a positioning rod.

7. The device of claim 1, wherein: The inner wall of the upper part of the lower sleeve is provided with a lifting ring for positioning the upper opening rod.

8. A method of sealing a tunnel cave using the tunnel cave sealing device according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: 1) first, a boundary hole is constructed to determine the range of karst cave; 2) a row of sealing holes is constructed on the boundary line of tunnel karst cave, and the wall protection sleeve is lowered to the top of the sealing hole; 3) the sealing treatment device is lowered, and the opening rod is pushed to open the dense-mesh barrier net; 4) the dense-mesh barrier nets are overlapped after being opened; 5) the dense-mesh barrier net is fixed in position by pouring material into the sealing hole to the bottom of the dense-mesh barrier net; 6) a pouring hole and a grouting hole are constructed in the boundary of tunnel, the closed space formed by the sealing net and the boundary of karst cave is filled with material first, and then grouting is carried out to make the karst cave compact.

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