Multi-layer karst cave grouting device for pile side of drilling pile in karst area

Abstract

The utility model discloses a karst area bored pile side multi-layer karst cave grouting device which comprises at least three sets of positioning steel bars, stiffening stirrups, steel bar protection ribs and grouting pipes, the three sets of positioning steel bars are distributed in a circle, the steel bar protection ribs are arranged on the side walls of the positioning steel bars, and the stiffening stirrups are arranged on the side walls of the reinforcing steel bars. The stiffening stirrups are arranged among the three sets of positioning steel bars, the grouting pipes are arranged on the stiffening stirrups and comprise the first layer of grouting pipes, the second layer of grouting pipes and the third layer of grouting pipes, and the first layer of grouting pipes, the second layer of grouting pipes and the third layer of grouting pipes are sequentially arranged at intervals. The first-layer grouting pipe, the second-layer grouting pipe and the third-layer grouting pipe sequentially correspond to three layers of karst caves. The grouting pipe can be rapidly and efficiently installed, uniform grouting is conducted on multiple layers of karst caves, the side friction resistance of the bored pile is effectively improved, the bearing capacity and pulling resistance of a pile foundation are improved, and the engineering cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of bored cast-in-place pile engineering, in particular to a grouting device for multi-layer karst caves on the side of bored piles in karst areas. Background Technique

[0002] When carrying out bored cast-in-place pile engineering in karst areas, the situation of multiple karst caves existing underground is often encountered. If these karst caves are not properly treated, it may seriously affect the stability and bearing capacity of the pile foundation. The traditional treatment method is to fill the karst caves before pouring the concrete of the bored cast-in-place pile, but this method often has problems such as incomplete filling and difficult control of filling quality, resulting in a reduction in the side friction resistance of the pile and insufficient bearing capacity and uplift resistance of the pile foundation. Content of the Utility Model

[0003] The purpose of the utility model is to solve the above technical problems, thereby providing a grouting device for multi-layer karst caves on the side of bored piles in karst areas;

[0004] To solve the above technical problems, the utility model provides the following technical solutions:

[0005] The utility model provides a grouting device for multi-layer karst caves on the side of bored piles in karst areas,

[0006] including positioning steel bars, stirrup reinforcement, steel bar protection bars, and grouting pipes. The positioning steel bars are set to at least three groups, and the three groups of positioning steel bars are circularly distributed. The steel bar protection bars are arranged on the side walls of the positioning steel bars. The stirrup reinforcement is arranged between the three groups of positioning steel bars. The grouting pipes are arranged on the stirrup reinforcement. The grouting pipes include a first-layer grouting pipe, a second-layer grouting pipe, and a third-layer grouting pipe. The first-layer grouting pipe, the second-layer grouting pipe, and the third-layer grouting pipe are arranged at intervals in sequence. The first-layer grouting pipe, the second-layer grouting pipe, and the third-layer grouting pipe respectively correspond to three layers of karst caves.

[0007] Optionally, the first-layer grouting pipe, the second-layer grouting pipe, and the third-layer grouting pipe are all set to two groups, and the two groups of the first-layer grouting pipe, the second-layer grouting pipe, and the third-layer grouting pipe are all located on the left and right sides of the bored pile.

[0008] Optionally, a plurality of grouting holes are arranged on the first-layer grouting pipe, the second-layer grouting pipe, and the third-layer grouting pipe. The grouting holes are evenly distributed along the length directions of the first-layer grouting pipe, the second-layer grouting pipe, and the third-layer grouting pipe, so as to uniformly grout the multi-layer karst caves.

[0009] Optionally, the stirrup reinforcement is set to several groups, and the several groups of stirrup reinforcement are arranged at intervals from top to bottom in sequence.

[0010] Optionally, a plurality of groups of the steel bar protection bars are provided, and the plurality of groups of the steel bar protection bars are arranged at intervals from top to bottom in sequence.

[0011] Optionally, the first-layer grouting pipes, the second-layer grouting pipes, and the third-layer grouting pipes in two groups are connected and communicated through connecting pipes to realize grouting into the karst caves on the left and right sides simultaneously or separately.

[0012] Optionally, blocking members are arranged at the ends of the first-layer grouting pipes, the second-layer grouting pipes, and the third-layer grouting pipes to block the first-layer grouting pipes, the second-layer grouting pipes, and the third-layer grouting pipes after grouting is completed to prevent the slurry from flowing back.

[0013] Advantages of the present utility model

[0014] This application can quickly and efficiently complete the installation of the grouting pipes, and uniformly grout the multi-layer karst caves, effectively improving the side friction resistance of the bored pile, increasing the bearing capacity and uplift resistance of the pile foundation, reducing the project cost. Through the application of this application, the construction quality and efficiency of the bored cast-in-place pile project in the karst area can be significantly improved. Description of the drawings

[0015] Figure 1 It is a schematic structural diagram of the present utility model.

[0016] Figure 2 It is a top view of the structure of the present utility model.

[0017] Figure 3 It is a schematic structural diagram of the positioning steel bars of the present utility model.

[0018] Description of the reference numerals: 1 - positioning steel bar, 2 - stirrup, 3 - steel bar protection bar, 4 - first-layer grouting pipe, 5 - second-layer grouting pipe, 6 - third-layer grouting pipe, 7 - bored pile, 8 - karst cave. Specific embodiments

[0019] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0020] Embodiment

[0021] As Figures 1-3 shown, the present utility model provides a multi-layer karst cave grouting device for the side of a bored pile in a karst area,

[0022] It includes positioning steel bars 1, stirrup reinforcement 2, steel bar protection bars 3, and grouting pipes. The positioning steel bars 1 are provided with at least three groups, and the three groups of positioning steel bars 1 are circularly distributed. The steel bar protection bars 3 are arranged on the side walls of the positioning steel bars 1. The stirrup reinforcement 2 is arranged between the three groups of positioning steel bars 1. The grouting pipes are arranged on the stirrup reinforcement 2. The grouting pipes include a first-layer grouting pipe 4, a second-layer grouting pipe 5, and a third-layer grouting pipe 6. The first-layer grouting pipe 4, the second-layer grouting pipe 5, and the third-layer grouting pipe 6 are arranged at intervals in sequence, and the first-layer grouting pipe 4, the second-layer grouting pipe 5, and the third-layer grouting pipe 6 correspond to three layers of karst caves 8 in sequence;

[0023] Both the first-layer grouting pipe 4, the second-layer grouting pipe 5, and the third-layer grouting pipe 6 are provided with two groups, and the two groups of the first-layer grouting pipe 4, the second-layer grouting pipe 5, and the third-layer grouting pipe 6 are both located on the left and right sides of the bored pile 7.

[0024] A plurality of grouting holes are arranged on the first-layer grouting pipe 4, the second-layer grouting pipe 5, and the third-layer grouting pipe 6, and the grouting holes are evenly distributed along the length directions of the first-layer grouting pipe 4, the second-layer grouting pipe 5, and the third-layer grouting pipe 6, so as to uniformly grout the multi-layer karst caves 8.

[0025] The stirrup reinforcement 2 is provided with several groups, and the several groups of stirrup reinforcement 2 are arranged at intervals from top to bottom in sequence.

[0026] The steel bar protection bars 3 are provided with several groups, and the several groups of steel bar protection bars 3 are arranged at intervals from top to bottom in sequence.

[0027] The two groups of the first-layer grouting pipe 4, the second-layer grouting pipe 5, and the third-layer grouting pipe 6 are connected and communicated through connecting pipes, so as to realize grouting into the karst caves 8 on the left and right sides simultaneously or separately.

[0028] Sealing members are arranged at the ends of the first-layer grouting pipe 4, the second-layer grouting pipe 5, and the third-layer grouting pipe 6, and are used to seal the first-layer grouting pipe 4, the second-layer grouting pipe 5, and the third-layer grouting pipe 6 after grouting is completed, so as to prevent the slurry from flowing back.

[0029] This application ensures that the grouting material can be uniformly and accurately injected into each layer of karst cave 8 by precisely positioning and installing the grouting pipes, so as to achieve the purpose of enhancing the side friction resistance of the pile, improving the bearing capacity and uplift resistance of the pile foundation.

[0030] This application includes the following working steps during use:

[0031] Preparation stage:

[0032] According to the geological exploration results, determine the location and geometric dimensions of the karst cave 8, fabricate grouting pipes on the ground, including the first-layer grouting pipe 4, the second-layer grouting pipe 5, and the third-layer grouting pipe 6, ensuring that they can correspond to the three layers of karst caves 8, and prepare components such as positioning steel bars 1, stirrup reinforcements 2, and steel bar protection ribs 3.

[0033] Installation stage:

[0034] Set the positioning steel bars 1 into three groups, distributed circularly, to fix the position of the grouting device. Set steel bar protection ribs 3 on the side walls of the positioning steel bars 1 to prevent the steel bars from being damaged during the grouting process. Set stirrup reinforcements 2 between the three groups of positioning steel bars 1 to enhance the overall stability of the device. Install the grouting pipes, including the first-layer grouting pipe 4, the second-layer grouting pipe 5, and the third-layer grouting pipe 6, on the stirrup reinforcements 2, ensuring that they correspond to the position of the karst cave 8.

[0035] Grouting stage:

[0036] Inject the grouting material into the grouting pipes through a grouting pump. The grouting material is evenly injected into the karst cave 8 along the grouting holes on the grouting pipes. As needed, grouting can be carried out simultaneously or separately to the karst caves 8 on the left and right sides.

[0037] Sealing stage:

[0038] After the grouting is completed, use a sealing member to seal the ends of the grouting pipes to prevent the slurry from flowing back.

[0039] Through the above working steps, this application can effectively grout and reinforce the multi-layer karst caves 8 on the side of the bored pile 7 in the karst area, improve the side friction resistance, bearing capacity, and uplift resistance of the bored pile 7, thereby ensuring the stability and safety of the pile foundation.

[0040] This application realizes a fast and efficient installation process of grouting pipes through precise design and prefabrication of grouting pipes, greatly shortening the construction period. The grouting process can be carried out simultaneously for multiple layers of karst caves 8, avoiding the cumbersome steps of repeated positioning and installation of grouting pipes, and further improving the construction efficiency.

[0041] The multiple grouting holes on the grouting pipes of this application are evenly distributed along the length direction, ensuring that the grouting material can be evenly and accurately injected into each layer of karst cave 8, improving the density and uniformity of grouting. By grouting simultaneously or separately to the karst caves 8 on the left and right sides, comprehensive reinforcement of the complex karst cave 8 structure can be achieved, enhancing the overall quality of grouting.

[0042] In this application, by grouting and strengthening the multi-layer karst caves 8, the side friction resistance of the bored pile 7 is effectively improved, the contact area and friction force between the pile foundation and the surrounding soil are increased, thereby enhancing the bearing capacity of the pile foundation. The grouting reinforcement also increases the uplift resistance of the pile foundation and improves the stability of the pile foundation under vertical load, ensuring the safety of the project.

[0043] This application is applicable to the problem of multi-layer karst caves 8 in bored cast-in-place pile projects in various karst areas. Regardless of how the size, shape, and position of the karst caves 8 change, it can be adapted by adjusting the size and layout of the grouting pipes. This device and method can also be applied to other similar geological conditions, such as karst landforms and karst cave development areas, etc., and has wide popularization and application value.

[0044] This application can quickly and efficiently complete the installation of the grouting pipes and uniformly grout the multi-layer karst caves 8, effectively improving the side friction resistance of the bored pile 7, increasing the bearing capacity and uplift resistance of the pile foundation, and reducing the project cost. Through the application of this application, the construction quality and efficiency of bored cast-in-place pile projects in karst areas can be significantly improved.

[0045] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A multi-layer cave grouting device for bored piles in karst areas, characterized in that: It includes positioning steel bars, reinforcing stirrups, steel bar protection bars, and grouting pipes. The positioning steel bars are arranged in at least three groups, and the three groups of positioning steel bars are distributed in a circular shape. The steel bar protection bars are arranged on the side walls of the positioning steel bars. The reinforcing stirrups are arranged between the three groups of positioning steel bars. The grouting pipes are arranged on the reinforcing stirrups. The grouting pipes include a first layer of grouting pipes, a second layer of grouting pipes, and a third layer of grouting pipes. The first layer of grouting pipes, the second layer of grouting pipes, and the third layer of grouting pipes are arranged in sequence at intervals. The first layer of grouting pipes, the second layer of grouting pipes, and the third layer of grouting pipes correspond to three layers of caves in sequence.

2. A multi-layer cave grouting device for bored piles in karst areas according to claim 1, characterized in that: The first layer grouting pipe, the second layer grouting pipe and the third layer grouting pipe are all arranged in two groups, and the two groups of the first layer grouting pipe, the second layer grouting pipe and the third layer grouting pipe are both located on the left and right sides of the bored pile.

3. A multi-layer cave grouting device for bored piles in karst areas according to claim 2, characterized in that: The first layer of grouting pipe, the second layer of grouting pipe and the third layer of grouting pipe are all provided with a plurality of grouting holes, and the grouting holes are evenly distributed along the length direction of the first layer of grouting pipe, the second layer of grouting pipe and the third layer of grouting pipe so as to evenly grout the multi-layer caves.

4. The multi-layer cave grouting device for bored piles in karst areas according to claim 1 is characterized in that: The reinforcing stirrups are arranged in a plurality of groups, and the plurality of groups of reinforcing stirrups are arranged in sequence from top to bottom.

5. The multi-layer cave grouting device for bored piles in karst areas according to claim 1, characterized in that: The steel bar protection bars are arranged in a plurality of groups, and the plurality of groups of steel bar protection bars are arranged in sequence from top to bottom.

6. The multi-layer cave grouting device for bored piles in karst areas according to claim 2, characterized in that: The two groups of the first layer grouting pipes, the second layer grouting pipes and the third layer grouting pipes are connected through connecting pipes to achieve grouting into the caves on the left and right sides simultaneously or separately.

7. A multi-layer cave grouting device for bored piles in karst areas according to claim 6, characterized in that: The ends of the first layer grouting pipe, the second layer grouting pipe and the third layer grouting pipe are all provided with plugging pieces for plugging the first layer grouting pipe, the second layer grouting pipe and the third layer grouting pipe after grouting is completed to prevent slurry from flowing back.

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