Grouting and exhausting device for soil dissolving hole

Abstract

The utility model discloses a soil dissolving hole grouting exhaust device which comprises an exhaust pipe arranged at an engineering pile position, a plurality of exhaust hole sets are formed in the exhaust pipe, and the exhaust hole sets are distributed on the pipe wall of a pipe section, extending into a soil dissolving hole, of an exhaust hole at intervals. A three-dimensional composite drainage net is fixed to the outer side of the exhaust pipe section provided with the exhaust hole set in a wrapping mode, and a conical plug is arranged at the bottom end of the exhaust pipe. According to the utility model, aiming at the soil dissolving hole with the shallow layer being a sand layer, sludge and other soft geologies, the traditional PVC plastic exhaust pipe is optimized, and the exhaust hole is formed in the engineering pile position by referring to the inverted filter principle in the engineering and the geogrid principle commonly used in municipal administration; and through the measures of trepanning an original exhaust pipe, wrapping the three-dimensional composite drainage net, arranging a conical plug and the like, mud and sand can be blocked, gas can be exhausted through gaps of meshes during grouting, the purposes of exhausting and normally stopping grouting are achieved, and wide application prospects are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of karst cave treatment in pile foundation engineering, in particular to a grouting exhaust device for a karst cave. Background Art

[0002] At present, the conventional practice for pre-treatment of karst caves in pile foundation projects at construction sites is to inject cement slurry into sleeve valve pipes and lower the exhaust pipe to 0.5m below the top of the karst cave. However, according to the on-site construction conditions, especially for karst caves with shallow sand layers, silt and other soft geological conditions, since the internal filling of the karst cave is mainly a sand-soil mixture, a drill pipe sleeve is required when drilling the exhaust hole. When the sleeve is pulled out, the buried exhaust pipe is often easy to fall down. Especially when the interior of the karst cave is filled, the installation of ordinary plastic exhaust pipes is easy to be wrapped and blocked by the filling materials such as quicksand and sand in the karst cave, making it difficult to achieve the exhaust effect. The cement slurry will continue to penetrate into the sand layer, and the conditions for terminating grouting cannot be reached in a short time, resulting in the grouting cost being too high and uneconomical.

[0003] After searching, the Chinese invention application document with the existing publication number CN117684544A discloses a fluidized solidified soil cave filling and replacement construction method, wherein an exhaust pipe with a bottom higher than the cave contents is set only at the position of the exhaust hole drilled on the cave. In other words, the exhaust pipe may still slide down and deviate from the initial position during the construction process, and there is still a risk of exhaust pipe blockage during the grouting process, which has certain limitations.

[0004] Therefore, it is urgent to study a grouting exhaust device for karst caves to ensure that the exhaust effect is achieved when the shallow layer is a soft geological layer such as sand layer and silt. Utility Model Content

[0005] In order to solve the problems existing in the prior art mentioned above, the purpose of the present utility model is to provide a karst cave grouting exhaust device. It is optimized based on the traditional PVC exhaust pipe, and an exhaust pipe with an exhaust hole group is manufactured on site as an exhaust device to achieve the purpose of exhausting and normally terminating grouting.

[0006] In order to achieve the above-mentioned and other related purposes, the present invention adopts the following technical solutions:

[0007] The utility model provides a grouting exhaust device for a karst cave, comprising an exhaust pipe arranged at an engineering pile position, wherein a plurality of exhaust hole groups are provided on the exhaust pipe, and the exhaust hole groups are distributed at intervals on the wall of the pipe section of the exhaust pipe extending into the karst cave, a three-dimensional composite drainage net is covered and fixed on the outer side of the exhaust pipe section with the exhaust hole groups, and a conical plug is provided at the bottom end of the exhaust pipe.

[0008] As a preferred technical solution, the length of the exhaust pipe is determined according to the ground elevation and the cave bottom elevation.

[0009] Furthermore, the minimum length of the exhaust pipe is greater than (ground elevation (104) - cave bottom elevation) - soil cave height / 2.

[0010] As a further preferred technical solution, when the height of the karst cave is h, the length L of the pipe section of the exhaust pipe extending into the karst cave is in the range of h / 2 to h.

[0011] As a preferred technical solution, the exhaust hole group includes two circles of eyelets, and each circle of eyelets contains four through holes, and the through holes are staggered up and down on the four sides of the exhaust pipe wall in a plum blossom shape.

[0012] Furthermore, the spacing between each group of exhaust holes ranges from 300 to 500 mm, and the spacing between two circles of holes is 100 mm.

[0013] As a preferred technical solution, the wrapping length of the three-dimensional composite drainage net is 100 mm longer than both ends of the exhaust pipe (103) extending into the karst cave.

[0014] As a preferred technical solution, the drainage net is fixed to the wall of the exhaust pipe by passing an iron wire through the exhaust hole group.

[0015] As a further preferred technical solution, the fixed spacing of the iron wires on the exhaust pipe is determined according to the spacing distances between the exhaust hole groups, and a circle of iron wire is fixed every two exhaust hole groups.

[0016] As described above, the present invention has the following beneficial effects:

[0017] (1) The utility model is a grouting exhaust device for a karst cave. By optimizing the design of the exhaust pipe, exhaust pipe lowering holes are set at the engineering pile position and the exhaust pipes are arranged, thereby improving the exhaust efficiency and ensuring economy, and at the same time ensuring the exhaust effect during grouting in the sand layer geological karst cave; at the same time, by opening holes, wrapping the three-dimensional composite drainage net, and setting a conical plug, the problem of the exhaust pipe being easily blocked by the filling materials such as the flowing sand in the karst cave when using ordinary plastic exhaust pipes in the traditional way is avoided, ensuring that the conditions for terminating grouting can be normally reached during construction, solving the problems of difficulty in exhausting and unlimited penetration of cement slurry into the sand layer, and at the same time controlling the grouting volume to a certain extent, avoiding the problem of high grouting cost caused by the inability to reach the conditions for terminating grouting in a short time, and realizing economical and efficient grouting construction.

[0018] (2) The utility model is a grouting exhaust device for a karst cave. Through the effective combination of a three-dimensional composite drainage net and its non-tearable characteristics, the device has enhanced protection and improved durability and reliability. At the same time, based on the functional advantages of the three-dimensional composite drainage net, the PVC plastic pipe is processed into an exhaust pipe. While effectively blocking mud and sand, it ensures that the gas can be discharged through the mesh gaps. Combined with the test results of a certain project construction site in Foshan, the device has the advantages of convenient construction and avoidance of pipe blockage, and can achieve the effect of smooth exhaust and normal termination of grouting during construction, and has successful feasibility.

[0019] (3) The utility model is a grouting exhaust device for a karst cave. By using a PVC plastic pipe which is easy to obtain as an exhaust pipe, the feasibility is enhanced and the cost is reduced, making the device more economical.

[0020] (4) The utility model of a grouting exhaust device for a karst cave has been verified in actual construction in project engineering applications, effectively reducing the investment in construction costs and achieving good economic and social benefits. The utility model is practical and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The utility model is a schematic diagram of the installation of a grouting exhaust device for a karst cave when the device is arranged in the karst cave.

[0022] Figure 2 The utility model is a structural schematic diagram of a grouting exhaust device for a karst cave.

[0023] Among them, the specific descriptions of the figure marks are as follows: 101, the boundary line of the karst cave; 102, the filling material; 103, the exhaust pipe; 104, the ground elevation; 105, the three-dimensional composite drainage network; 106, the conical plug; 107, the through hole; 108, the iron wire; 109, the engineering pile position. DETAILED DESCRIPTION

[0024] In order to better understand the purpose, structure and function of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0025] In the description of the present invention, it should be noted that the positional relationships indicated by terms such as "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" cited in this specification are based on the positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0026] Example

[0027] like Figure 2 As shown, this embodiment provides a grouting exhaust device for a karst cave, including an exhaust pipe 103 , a three-dimensional composite drainage net 105 and a conical plug 106 .

[0028] The length of the exhaust pipe 103 is determined according to the ground elevation 104 and the elevation of the bottom of the cave. Specifically, the exhaust pipe 103 is a PVC plastic pipe with a diameter of DN48mm. The bottom end of the exhaust pipe 103 is provided with a conical plug 106, and the material of the conical plug 106 is plastic; the exhaust pipe 103 is set at the engineering pile position 109. When the height of the karst cave is h, the minimum length of the exhaust pipe 103 is greater than (ground elevation 104-karst cave bottom elevation)-karst cave height h / 2, and the length L of the pipe section of the exhaust pipe 103 extending into the karst cave is in the range of h / 2 to h.

[0029] The exhaust pipe 103 extending into the karst cave has several groups of exhaust holes on its wall. The spacing M between the exhaust hole groups is 300 to 500 mm. Each exhaust hole group includes two circles of eyes, with a spacing of 100 mm between the two circles of eyes, and each circle of eyes contains four through holes 107. The through holes 107 are staggered up and down on the four sides of the exhaust pipe 103 wall in a plum blossom shape. The diameter of the through holes 107 is 10 mm.

[0030] The outer side of the wall of the exhaust pipe 103 section with the exhaust hole group is covered with a three-dimensional composite drainage net 105, which provides both tear-resistant strength and air permeability. The wrapped length of the three-dimensional composite drainage net 105 is 100 mm longer than both ends of the section of the exhaust pipe 103 extending into the karst cave; the drainage net is fixed to the wall of the exhaust pipe 103 by passing the exhaust hole group through the iron wire 108. The fixed spacing of the iron wire 108 on the exhaust pipe 103 is determined according to the spacing distance of the exhaust hole group, and a circle of iron wire 108 is fixed for every two groups of exhaust holes.

[0031] like Figure 1 As shown, in actual work, the main construction steps include:

[0032] S1. Prepare the above-mentioned grouting exhaust device for a karst cave.

[0033] S1-1. Prepare the exhaust pipe 103 of appropriate length according to measurement and calculation and mark the opening range:

[0034] According to the advance drilling data and the actual depth of breaking through the rock layer on site, the height of the karst cave is determined to be h.

[0035] A PVC plastic pipe with a diameter of DN48mm and qualified by inspection is selected as the exhaust pipe 103, which is easy to obtain, has strong feasibility and low cost. Referring to the height h of the karst cave and the filling condition of the filler 102 such as sand and soil in the karst cave, the minimum length of the exhaust pipe 103 is obtained to be greater than (ground elevation 104-karst cave bottom elevation)-karst cave height h / 2. At the same time, the length L of the pipe section of the exhaust pipe 103 extending into the karst cave is in the range of h / 2~h. An opening range mark is drawn on the wall of the exhaust pipe 103, and the opening range mark is located at a position where the distance L is measured upward from the bottom end of the exhaust pipe 103.

[0036] S1-2. According to the hole range mark, use an electric drill to drill the exhaust hole group on the wall of the exhaust pipe 103.

[0037] According to the hole range mark, an exhaust hole group is opened on the wall of the pipe section of the exhaust pipe 103 extending into the karst cave. The drilling principles of the exhaust hole group include: drilling a group of exhaust holes every 30cm to 50cm, that is, 2 to 3 groups of exhaust holes are opened per meter on the pipe wall from the hole range mark to the bottom end of the exhaust pipe 103, each group of exhaust holes includes two circles of eyes, and the interval between the two circles of eyes is 10cm, and each circle of eyes contains four through holes 107, and each through hole 107 is staggered up and down on the four sides of the exhaust pipe 103 wall in a plum blossom shape, that is, each group of exhaust holes includes eight through holes 107 with a diameter of 10mm, and the eight through holes 107 are staggered up and down on the four sides of the exhaust pipe 103 wall in a plum blossom shape.

[0038] S1-3, wrap the three-dimensional composite drainage net 105 on the outer side of the pipe wall of the exhaust pipe 103 section and fix it through the holes with the iron wire 108.

[0039] The wrapping length of the three-dimensional composite drainage net 105 is 100 mm longer than the ends of the exhaust pipe 103 extending into the karst cave, so that the outer side of the pipe wall of the exhaust pipe 103 section with the exhaust hole group is covered with the three-dimensional composite drainage net 105, which not only provides tear-resistant strength and enhances protection, but also has air permeability. At the same time, it can also prevent shallow sand, silt and mud from being blocked when the pipe is lowered, so that the conditions for terminating grouting can be reached normally during subsequent construction, and the slurry will not penetrate into the sand layer indefinitely, and the grouting amount is also controlled to a certain extent. It should be noted here that the three-dimensional composite drainage net 105 is a type of geosynthetics, a new type of drainage geotechnical material, made of high-density polyethylene (HDPE) as raw material and processed by a special extrusion molding process. It has a three-layer special structure. The middle ribs are very rigid and arranged longitudinally to form a drainage channel. The ribs arranged crosswise above and below form a support to prevent the geotextile from embedding in the drainage channel, and can maintain a high drainage performance even under very high loads; the double-sided bonded permeable geotextile is used in combination, and has the comprehensive performance of "anti-filtration-drainage-breathability-protection", with both puncture-resistant strength and breathability; it is mainly used for drainage of landfills, roadbeds and tunnel walls, and can be obtained through procurement, so it will not be elaborated here.

[0040] The three-dimensional composite drainage net 105 is fixedly connected to the exhaust pipe 103 by iron wire 108 passing through the exhaust hole group. The fixed spacing of the iron wire 108 on the exhaust pipe 103 is determined according to the opening spacing of the exhaust hole group. A circle of iron wire 108 is fixed for every two groups of exhaust holes, that is, the spacing between each iron wire 108 is every other two according to the opening spacing; the composite drainage net can be pre-made into a cylindrical shape to facilitate wrapping on the exhaust pipe 103. The overlapping part of the three-dimensional composite drainage net 105 is fixed with nylon buckles or rolled strips to ensure the stability and continuity of the drainage net.

[0041] S1-4. Install a fixed conical plug 106 at the bottom end of the exhaust pipe 103 to help discharge air and moisture in the soil hole during the grouting process, avoid the formation of bubbles, ensure the uniformity and density of the grouting material, and complete the assembly of the exhaust device.

[0042] S2. Install an exhaust device at the karst cave and seal the cave opening with mortar.

[0043] S2-1. Lower the exhaust pipe 103 into the karst cave through the drill pipe sleeve. The exhaust pipe 103 is lowered to the engineering pile position 109, which is both economical and can ensure effective exhaust effect during grouting in the sand layer geological karst cave at this hole position.

[0044] S2-2. Seal the opening at the lowered location of the exhaust pipe 103 with a double-liquid slurry sealant to a depth of no less than 1.5 m. Because the exhaust pipe 103 of the present invention is provided with a conical plug 106 at the bottom, it can effectively prevent clogging by the sand-soil mixture filling the cave compared to conventional exhaust pipes 103.

[0045] S2-3. After sealing the hole, pull out the drill pipe sleeve. According to the actual construction situation, due to the sand layer geology and the low sealing depth of the double-liquid slurry pipe, the exhaust pipe 103 may be disturbed and slide down under the combined action of gravity until it reaches the bottom of the karst hole. Repeat the sealing operation of step S2-2 to complete the setting of the exhaust device.

[0046] S3. After the preparation of the exhaust device is completed, the subsequent grouting operation is carried out: the subsequent grouting operation is carried out according to the requirements of the construction plan. The grouting is terminated when slurry emerges from the ground or the pressure reaches 2.0-2.5 MPa for 15 minutes. At this time, the slurry is filled within the boundary line 101 of the karst cave. During grouting, the air in the karst cave is compressed, and the gas is discharged through the through holes 107 provided on the side wall of the exhaust pipe 103, while the filling materials 102 such as mud and sand are blocked by the three-dimensional composite drainage net 105, thereby avoiding the problem of slurry overflowing due to blockage of the exhaust pipe 103 and the inability to meet the grouting conditions.

[0047] The utility model is aimed at karst caves with soft geological conditions such as sand layers and silt in shallow layers. It is optimized based on the traditional PVC plastic exhaust pipe 103, and with reference to the filter layer principle in engineering and the geogrid principle commonly used in municipal engineering, the exhaust hole is set at the engineering pile position 109. By opening holes in the original exhaust pipe 103, wrapping the three-dimensional composite drainage net 105, and setting a conical plug 106, etc., it can not only block mud and sand, but also allow gas to be discharged through the mesh gaps during grouting, thereby achieving the purpose of exhausting and normally terminating grouting, and has broad application prospects.

[0048] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. It is understood by those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. Furthermore, under the guidance of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are intended to be protected by the present invention.

Claims

1. A grouting exhaust device for a karst cave, characterized in that: The invention comprises an exhaust pipe (103) arranged at a project pile position (109), wherein the exhaust pipe (103) is provided with a plurality of exhaust hole groups, wherein the exhaust hole groups are distributed at intervals on the wall of the pipe section of the exhaust pipe (103) extending into the karst cave, and a three-dimensional composite drainage net (105) is coated and fixed on the outer side of the pipe section of the exhaust pipe (103) provided with the exhaust hole groups, and a conical plug (106) is provided at the bottom end of the exhaust pipe (103).

2. A grouting exhaust device for karst cave according to claim 1, characterized in that: The length of the exhaust pipe (103) is determined according to the ground elevation (104) and the cave bottom elevation.

3. A grouting exhaust device for karst cave according to claim 2, characterized in that: The minimum length of the exhaust pipe (103)>(ground elevation-karst cave bottom elevation)-karst cave height / 2.

4. The grouting exhaust device for karst cave according to claim 1, characterized in that: When the height of the karst cave is h, the length L of the pipe section of the exhaust pipe (103) extending into the karst cave is in the range of h / 2 to h.

5. The grouting exhaust device for karst cave according to claim 1, characterized in that: The exhaust hole group comprises two circles of eyelets, and each circle of eyelets contains four through holes (107). The through holes (107) are arranged in a plum blossom shape on four sides of the wall of the exhaust pipe (103) in an up-and-down staggered manner.

6. A grouting exhaust device for karst cave according to claim 5, characterized in that: The spacing between each group of exhaust holes ranges from 300 to 500 mm, and the spacing between two circles of eyes is 100 mm.

7. The grouting exhaust device for karst cave according to claim 4, characterized in that: The wrapping length of the three-dimensional composite drainage net (105) is 100 mm longer than the two ends of the pipe section of the exhaust pipe (103) extending into the karst cave.

8. The grouting exhaust device for karst cave according to claim 1, characterized in that: The drainage net is fixed to the wall of the exhaust pipe (103) by means of an iron wire (108) passing through the exhaust hole group.

9. The grouting exhaust device for karst cave according to claim 8, characterized in that: The fixed spacing of the iron wire (108) on the exhaust pipe (103) is determined according to the spacing distance of the exhaust hole groups, and a circle of iron wire (108) is fixed every two exhaust hole groups.

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