Steel wire mesh composite structure for treating cast-in-place pile karst cave

Abstract

The utility model discloses a steel wire mesh composite structure for processing a karst cave of a cast-in-place pile, which comprises a steel wire mesh layer for preventing concrete from leaking, the steel wire mesh layer is coated on the periphery of a reinforcement cage of the cast-in-place pile, and the steel wire mesh layer is opposite to the position of the karst cave and is matched with the height of the karst cave when the reinforcement cage is inserted; and the connecting piece is used for connecting the steel wire mesh layer with the reinforcement cage. Through the arrangement of the steel wire mesh composite structure, the construction efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of building construction, in particular to a steel wire mesh composite structure for treating cast-in-place pile karst caves. Background Art

[0002] Guangxi is a karst landform with many caves as one of its characteristics. When constructing cast-in-place piles in the cave area, if no protection is provided, the concrete will easily leak into the cave during pouring, resulting in a large amount of concrete material waste. There are several conventional treatment methods for cast-in-place piles when encountering caves:

[0003] Backfill method: Use stone or concrete backfill. Due to the limitations of geological survey, we can only check the top and bottom elevations of the cave at the pile position, that is, the height of the cave, but it is difficult to determine the actual volume and shape of the cave. If the backfill method is adopted, it may consume a lot of materials and time, and it may also cause difficulties in the later construction of adjacent pile foundations;

[0004] Grouting method: First drill holes and bury pipes, then grout to fill and reinforce the caves. The grouting method is cumbersome, and because the grouting method is point-selected grouting, it is impossible to grout all the construction areas where the caves are located, and it may also consume a lot of cement and other materials, and it may also cause difficulties in the later construction of adjacent pile foundations;

[0005] Steel casing follow-up method: During the drilling process, a steel casing with an outer diameter 20 to 30 cm larger than the designed pile diameter is used to follow up and protect the hole wall. The wall thickness of the steel casing is generally 12 to 18 mm, and the wall thickness of the steel casing is proportional to the drilling depth. The production and installation of the steel casing require special equipment, and the cost of pile foundation construction will increase exponentially. Utility Model Content

[0006] The purpose of the utility model is to overcome the defects of the prior art and provide a wire mesh composite structure for treating cast-in-place pile caves, which can prevent slurry from leaking into the caves. Compared with traditional construction methods, the production cost is lower and the construction period is not affected.

[0007] To achieve the above purpose, the technical solution adopted by the utility model is a steel wire mesh composite structure for treating cast-in-place pile karst caves, comprising:

[0008] A steel mesh layer for preventing concrete from leaking out, the steel mesh layer being coated on the outer periphery of the steel cage of the cast-in-place pile, and when the steel cage is inserted, the steel mesh layer is directly opposite to the location of the karst cave and is adapted to the height of the karst cave;

[0009] A connector for connecting the wire mesh layer to the reinforcement cage.

[0010] A further improvement of the steel wire mesh composite structure for treating cast-in-place pile karst caves of the utility model is that the connecting piece is a stirrup, and the stirrup is passed through the steel wire mesh layer and is hooped around the outer periphery of the steel cage.

[0011] A further improvement of the wire mesh composite structure for treating cast-in-place pile caves of the utility model is that the wire mesh layer extends upwards at least 1 m above the top elevation of the cave, and extends downwards at least 1 m below the bottom elevation of the cave.

[0012] A further improvement of the steel wire mesh composite structure for treating cast-in-place pile karst caves of the utility model is that the outer periphery of the steel wire mesh layer is covered with a layer of geotextile.

[0013] Compared with the prior art, the advantages of the present invention are:

[0014] 1. By setting a wire mesh layer to cover the steel cage, it is prevented that the slurry leaks from the steel cage into the cave during grouting, causing a large amount of material waste.

[0015] 2. By setting up the geotextile, the slurry is further prevented from leaking out and it also serves as a concrete protective layer for the bored pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 The utility model is a structural schematic diagram of a steel wire mesh composite structure for treating a karst cave of a cast-in-place pile.

[0018] In the figure: 1. Cave; 2. Geotextile; 3. Wire mesh layer; 4. Stirrups; 5. Steel cage. DETAILED DESCRIPTION

[0019] The following is an explanation of the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0020] The steel wire mesh composite structure for treating cast-in-place pile karst caves of the utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0021] See also Figure 1 , the wire mesh composite structure for treating the cast-in-place pile cave 1 includes:

[0022] A steel mesh layer 3 for preventing concrete from leaking out, the steel mesh layer 3 is coated on the outer periphery of the steel cage 5 of the cast-in-place pile, and when the steel cage 5 is inserted, the steel mesh layer 3 is directly opposite to the location of the karst cave 1 and is adapted to the height of the karst cave 1;

[0023] A connecting piece used to connect the wire mesh layer 3 to the steel cage 5.

[0024] By providing the steel wire mesh layer 3 and covering the outer periphery of the steel cage 5, during the subsequent concrete pouring of the bored pile, it is prevented that the concrete leaks into the cave 1 from the gap between the steel cage 5 and the cave 1, causing the loss of concrete, resulting in a large amount of material waste and affecting the quality of the bored pile.

[0025] Preferably, the connecting member is a stirrup 4 , which is passed through the steel mesh layer 3 and is hooped around the outer periphery of the steel cage 5 .

[0026] Specifically, there are multiple stirrups 4, which are spaced apart along the axial direction of the steel cage 5 and do not exceed the range where the wire mesh layer 3 is covered.

[0027] Preferably, the wire mesh layer 3 extends upwardly at least 1 m above the top elevation of the cave 1 , and extends downwardly at least 1 m below the bottom elevation of the cave 1 .

[0028] By limiting the coverage of the steel wire mesh layer 3 , the anti-leakage capability of the cast-in-place pile in the karst cave 1 is further improved.

[0029] Preferably, the outer periphery of the steel mesh layer 3 is covered with a layer of geotextile 2 .

[0030] By setting the geotextile 2, the slurry can be further prevented from leaking out and it can also serve as the concrete protective layer of the cast-in-place pile.

[0031] Specifically, the mesh of the steel mesh layer 3 satisfies the requirement that the steel mesh layer 3 has elasticity.

[0032] Since the steel mesh layer 3 is elastic, the steel mesh layer 3 will expand outwards under the lateral pressure of the concrete, thereby preventing the steel mesh layer 3 from being damaged due to excessive lateral pressure.

[0033] A construction method for a steel wire mesh composite structure of a cast-in-place pile karst cave, comprising the steps of:

[0034] Step 1: Conduct geological survey at the location where the cast-in-place pile is to be constructed to determine the top elevation and bottom elevation of the cave 1;

[0035] Step 2: Prefabricate a steel wire mesh composite structure according to the measured depth of the cave 1;

[0036] Step 3: Drill until the designed height to generate the pile hole;

[0037] Step 4: Connect the wire mesh composite structure to the steel cage 5 and lower it into the pile hole;

[0038] Step 5: Casting of cast-in-place piles.

[0039] Specifically, when pouring to the location of the cave 1, the pouring speed is reduced to avoid excessively high pouring speed causing a sudden increase in lateral pressure on the wire mesh layer 3, which affects the structural stability and improves the quality of the pile.

[0040] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of the present specification are only used to match the contents disclosed in the specification for people familiar with the technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present utility model, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present utility model, should still fall within the scope of the technical contents disclosed by the present utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in the present specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present utility model. The change or adjustment of the relative relationship, without substantial change of the technical contents, should also be regarded as the scope of the implementation of the present utility model.

[0041] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with the profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A wire mesh composite structure for treating cast-in-place pile karst caves, characterized in that: include: A steel mesh layer for preventing concrete from leaking out, the steel mesh layer being coated on the outer periphery of the steel cage of the cast-in-place pile, and when the steel cage is inserted, the steel mesh layer is directly opposite to the location of the karst cave and is adapted to the height of the karst cave; A connector for connecting the wire mesh layer to the reinforcement cage.

2. The steel wire mesh composite structure for treating cast-in-place pile karst caves according to claim 1, characterized in that: The connecting piece is a stirrup, which is passed through the steel wire mesh layer and is hooped around the outer periphery of the steel cage.

3. The steel wire mesh composite structure for treating cast-in-place pile karst caves according to claim 1, characterized in that: The wire mesh layer extends upwardly at least 1 m above the top elevation of the cave, and extends downwardly at least 1 m below the bottom elevation of the cave.

4. The steel wire mesh composite structure for treating cast-in-place pile karst caves according to claim 1, characterized in that: The outer periphery of the steel wire mesh layer is covered with a layer of geotextile.

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