Special simple pile casing for pile foundation to pass through karst cave

Abstract

The utility model discloses a special simple pile casing for a pile foundation to pass through a karst cave, which comprises a connecting net sleeved on the outer side of a pile foundation reinforcement cage; the protective layer is connected to the inner side of the connecting net to form a protective cylinder side wall; the connecting rings are connected to the two ends and the middle of the connecting net respectively; one ends of the connecting rods are connected to the inner sides of the connecting rings at the two ends respectively; wherein the other end of the connecting rod is connected with the pile foundation reinforcement cage. The pile foundation filling coefficient can be effectively reduced, the concrete consumption is reduced, the construction cost is reduced, the pile foundation filling coefficient is basically not limited by construction site conditions, the pile foundation can be directly machined, manufactured and installed on a construction site, batch manufacturing can be achieved, other construction procedures do not need to be additionally added during hole forming and concrete pouring, the construction period is not affected, and the construction efficiency is improved. By using the pile casing, it can be guaranteed that the pile diameter of a formed pile foundation and the thickness of a concrete protective layer reach the standard according to design requirements, the risk of diameter expansion and diameter shrinkage at a karst cave is reduced, and the pile forming quality of the pile foundation under the karst landform is effectively improved.

Description

Technical Field

[0001] The utility model relates to a simple casing, in particular to a special simple casing for a pile foundation passing through a karst cave. The utility model is mainly used as a device for controlling the pouring of pile body concrete into the karst cave when the pile foundation passes through the karst cave during the construction of an end-bearing pile, and belongs to the technical field of construction processing of building pile foundations. Background Art

[0002] Generally speaking, pile foundation construction has always been a difficult point in karst landforms. At present, this construction problem is mainly solved by three solutions: steel casing construction, direct pouring of pile body concrete, or pouring of low-grade concrete and secondary drilling. If steel casing construction is adopted, the construction cost is high and the construction is more complicated. If the pile body concrete is directly poured or low-grade concrete is poured and secondary drilling is performed, more concrete is used and the cost is high. Direct pouring of pile body concrete will lead to a larger pile foundation filling coefficient, more difficult to collect settlement processing information, greater settlement audit risks, unsatisfactory pile quality, and more difficult to evaluate the project.

[0003] Therefore, the key to solving the above technical problems is to develop a special simple casing for pile foundations passing through caves that is practical, easy to manufacture and install on site, and simple to operate. Summary of the Invention

[0004] In view of the many defects and shortcomings in the above-mentioned background technology, the present invention has made improvements and innovations thereto, with the aim of providing a practical, reliable and easy-to-operate special simple casing for pile foundations passing through caves, which can effectively reduce the pile foundation filling coefficient, reduce the amount of concrete used and reduce construction costs.

[0005] Another invention purpose of the utility model is that it is simple to manufacture. It can use common construction materials to simplify the steel casing. It has a simple structure and is basically not restricted by construction site conditions. It can be directly processed, manufactured and installed at the construction site. It can be produced in batches and does not require additional construction processes when drilling holes and pouring concrete, which does not affect the construction period.

[0006] Another purpose of the utility model is to ensure that the pile diameter and concrete protective layer thickness of the formed pile foundation meet the design requirements by using the casing, reduce the risk of diameter expansion and contraction in the cave, and effectively improve the quality of pile foundation in karst landforms.

[0007] In order to solve the above problems and achieve the above invention objectives, the utility model is a special simple casing for pile foundation passing through a cave by adopting the following design structure and the following technical solutions:

[0008] As an improvement of a special simple casing for a pile foundation passing through a karst cave, the utility model comprises:

[0009] A connecting net (1), the connecting net (1) is sleeved on the outside of the pile foundation reinforcement cage (5);

[0010] A protective layer (2), the protective layer (2) is connected to the inner side of the connecting net (1) to form a side wall of the casing;

[0011] Connecting rings (3), the connecting rings (3) are respectively connected to both ends and the middle of the connecting net (1);

[0012] A connecting rod (4), one end of which is connected to the inner sides of the connecting rings (3) at both ends;

[0013] The other end of the connecting rod (4) is connected to the pile foundation reinforcement cage (5).

[0014] As an improvement of the above-mentioned utility model, the connecting net (1) is formed by connecting mutually interwoven steel wires.

[0015] As a further improvement of the above-mentioned utility model, the mesh of the connecting net (1) is square or diamond-shaped.

[0016] As a further improvement of the above-mentioned utility model, the protective layer (2) is connected to the connecting net (1) through iron wire.

[0017] As a further improvement of the above-mentioned utility model, the protective layer (2) is a geotextile.

[0018] As a further improvement of the above-mentioned utility model, the connecting ring (3) is a circular or ring-shaped structure formed by galvanized round steel.

[0019] As a further improvement of the above-mentioned utility model, the connecting rod (4) is a rod-shaped component.

[0020] As a further improvement of the above-mentioned utility model, the connecting rod (4) is galvanized round steel.

[0021] As a further improvement of the above-mentioned utility model, there are at least two connecting rods (4).

[0022] As a further improvement of the above-mentioned utility model, the connecting net (1) is also sprayed with a corrosion-resistant polymer or an anti-corrosion coating.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] 1. The utility model is practical, reliable, and easy to operate. It can reduce the amount of concrete poured into the cave, improve the quality of pile foundation construction, reduce the risk of pile foundation expansion or contraction, control the pile foundation filling coefficient, reduce the amount of concrete used, and reduce construction costs.

[0025] 2. The utility model has a simple structure and is easy to manufacture. It can use common construction materials to simplify the steel casing. It is basically not restricted by construction site conditions and can be directly processed, manufactured and installed on the construction site. It can be produced in batches and does not require additional construction processes when forming holes and pouring concrete, which does not affect the construction period.

[0026] 3. The utility model can ensure that the pile diameter and the thickness of the concrete protective layer of the formed pile foundation meet the design requirements, reduce the risk of diameter expansion and contraction in the cave, and effectively improve the quality of pile foundation in karst landforms. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, wherein:

[0028] Figure 1 This is one of the usage state diagrams of the utility model;

[0029] Figure 2 This is the second diagram of the use state of the utility model;

[0030] Figure 3 This utility model Figure 2 Cross-sectional view at AA;

[0031] Figure 4 This is the third diagram of the use state of the utility model;

[0032] Figure 5 It is an exploded view of the utility model;

[0033] Among them, the numbers in the figure are: 1—connection network;

[0034] 2—protective layer;

[0035] 3—Connecting ring;

[0036] 4—connecting rod;

[0037] 5—Pile foundation reinforcement cage;

[0038] 6—Cave. DETAILED DESCRIPTION

[0039] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the technical solution of the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other unless there is a conflict. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0040] As the instruction manual Figure 1 To the instruction manual Figure 5A special simple casing for a pile foundation passing through a karst cave is shown, which comprises:

[0041] Connecting net 1, which is sleeved on the outside of the pile foundation reinforcement cage 5;

[0042] Protective layer 2, which is connected to the inner side of the connecting net 1 to form the side wall of the casing;

[0043] Connecting rings 3, which are respectively connected to both ends and the middle of the connecting net 1;

[0044] A connecting rod 4, one end of which is connected to the inner side of the connecting rings 3 at both ends;

[0045] The other end of the connecting rod 4 is connected to the pile foundation reinforcement cage 5 .

[0046] Further, such as Figure 1 As shown, the connection net 1 is formed by interconnected steel wires.

[0047] Specifically, such as Figure 4 and Figure 5 As shown, the meshes of the connecting net 1 are square or diamond-shaped.

[0048] Further, such as Figure 4 and Figure 5 As shown, the protective layer 2 is connected to the connecting net 1 through iron wire.

[0049] Specifically, the protective layer 2 is a geotextile.

[0050] More specifically, the connecting ring 3 is a circular or ring-shaped structure made of galvanized round steel.

[0051] Further, such as Figure 5 As shown, the connecting rod 4 is a rod-shaped component.

[0052] More specifically, the connecting rod 4 is made of galvanized round steel.

[0053] More specifically, there are at least two connecting rods 4 .

[0054] Furthermore, the connection net 1 is sprayed with corrosion-resistant polymer or anti-corrosion paint.

[0055] In the present invention, the surface of the connecting net 1 is sprayed with anti-corrosion paint, which can improve durability and service life.

[0056] At the same time, in the present invention, the connections referred to are all fixed connections, movable connections or detachable connections, among which the fixed connection is a welding connection or is directly processed into an one-piece molded structure; the movable connection or detachable connection is a hinged connection, a threaded connection, a bayonet connection, a plug-in connection or a bolt assembly connection or a screw connection.

[0057] In summary, the more specific implementation methods of the present invention are:

[0058] Before using the special simple casing for a pile foundation of the above-mentioned design structure passing through a karst cave, it is necessary to install it as a backup.

[0059] The specific steps are:

[0060] Step 1: The construction personnel first survey each pile one by one according to the geological survey report, find out the location of the pile foundation to be constructed, the vertical height of the cave 6, and the elevation of the cave 6, and mark the corresponding position of the pile foundation steel cage 5 with red paint;

[0061] Step 2: Prepare the materials. The width of the connecting mesh 1 and the protective layer 2 is equal to the vertical height of the cave 6 + 2m. This ensures that after the cylinder is placed in the pile hole, the width of each end is 1m wider than the vertical height of the cave 6. The length of the connecting mesh 1 and the protective layer 2 is equal to the circumference of the pile diameter + 20mm. This ensures that when rolled into the side wall of the cylinder, there is a 20mm overlap. The diameter of the connecting ring 3 is equal to the pile diameter. The connecting rod 4 is equal to the thickness of the concrete protective layer + 20mm. This ensures that there is a certain welding length at both ends.

[0062] Step 3: Casing production: construction workers first lay the protective layer 2 on the connecting mesh 1; then, construction workers fix the protective layer 2 on the connecting mesh 1 with wire to form the side wall of the casing; then, construction workers place the connecting ring 3 on top of the protective layer 2. If the width of the connecting mesh 1 is too large, add a connecting ring 3 in the middle. The distance between adjacent connecting rings 3 is ≤ 5m. The connecting mesh 1 and the protective layer 2 are rolled into the casing along the connecting ring 3. Subsequently, the connecting ring 3 is firmly connected to the connecting mesh 1 and the protective layer 2 with wire to form a cylindrical casing;

[0063] Step 4: The construction workers place the casing at the position of the pile foundation reinforcement cage 5 corresponding to the cave 6, and use the lifting equipment to hang the pile foundation reinforcement cage 5 into the casing of the design structure of the utility model. Then, the connecting rings 3 at both ends are welded to the pile foundation reinforcement cage 5 with connecting rods 4, with no less than four connecting rods 4 at each end;

[0064] Step 5: The construction workers hoist the pile foundation reinforcement cage 5 with the casing fixed into the pile hole. After the pile foundation reinforcement cage 5 is stabilized, the pile body concrete is poured. After the concrete pouring is completed, the casing and the pile foundation reinforcement cage 5 are buried in the foundation together.

[0065] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and does not constitute any other limitation to the present invention. Any person skilled in the art may utilize the above-disclosed technical content to modify or remodel the present invention into equivalent embodiments. However, any simple modifications, equivalent variations, and modifications to the above embodiments that do not depart from the technical content of the present invention and are based on the technical essence of the present invention shall still fall within the scope of protection of the present invention.

Claims

1. A special simple casing for pile foundation passing through a cave, characterized in that it include: A connecting net (1), the connecting net (1) is sleeved on the outside of the pile foundation reinforcement cage (5); A protective layer (2), the protective layer (2) is connected to the inner side of the connecting net (1) to form a side wall of the casing; Connecting rings (3), the connecting rings (3) are respectively connected to both ends and the middle of the connecting net (1); A connecting rod (4), one end of which is connected to the inner sides of the connecting rings (3) at both ends; The other end of the connecting rod (4) is connected to the pile foundation reinforcement cage (5).

2. The special simple casing for pile foundation passing through a karst cave according to claim 1, characterized in that: The connecting net (1) is formed by connecting mutually interwoven steel wires.

3. The special simple casing for pile foundation passing through a cave according to claim 2, characterized in that: The meshes of the connecting net (1) are square or diamond-shaped.

4. The special simple casing for pile foundation passing through a karst cave according to claim 1, characterized in that: The protective layer (2) is connected to the connecting net (1) via iron wire.

5. The special simple casing for pile foundation passing through a karst cave according to claim 4, characterized in that: The protective layer (2) is a geotextile.

6. The special simple casing for pile foundation passing through a karst cave according to claim 1, characterized in that: The connecting ring (3) is a circular or ring-shaped structure formed by being surrounded by galvanized round steel.

7. The special simple casing for pile foundation passing through a karst cave according to claim 1, characterized in that: The connecting rod (4) is a rod-shaped component.

8. The special simple casing for pile foundation passing through a karst cave according to claim 7, characterized in that: The connecting rod (4) is made of galvanized round steel.

9. The special simple casing for pile foundation passing through a karst cave according to claim 8, characterized in that: There are at least two connecting rods (4).

10. The special simple casing for pile foundation passing through a karst cave according to claim 1, characterized in that: The connecting net (1) is also sprayed with corrosion-resistant polymer or anti-corrosion paint.

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