A water seepage prevention system applied to a bite pile of a foundation pit engineering

Abstract

The application discloses a kind of water seepage prevention systems of application in foundation pit engineering bite pile in the technical field of foundation pit supporting structure, including the side of adjacent plain concrete B2 pile of plain concrete B1 pile is opened with bite part, the steel reinforced concrete A pile D position that overlaps with bite part is set on guide wall, steel reinforced concrete A pile is arranged in steel reinforced concrete A pile D position interior, steel reinforced concrete A pile includes steel reinforcement cage and water-blocking structure, water-blocking structure is located in steel reinforced concrete A pile D position interior with steel reinforcement cage, steel reinforced concrete A pile C position includes the area that is not covered by steel reinforced concrete A pile D position is concrete pile E position, concrete pile is provided in concrete pile E position, and the re-bite of plain concrete B1 pile is realized by concrete pile;Under the action of water-blocking structure, it can be in the area that is not covered by steel reinforced concrete A pile D position is concrete pile E position and pours concrete pile, so as to realize the re-bite with the plain concrete B pile that cannot be cut by concrete pile, and the waterproof effect is good, and the cost is low.

Description

Technical Field

[0001] This invention relates to the technical field of foundation pit support structures, and in particular to a seepage prevention system applied to interlocking piles in foundation pit engineering. Background Technology

[0002] With the continuous development of cities and the improvement of construction technology in my country, the utilization of underground space is becoming more and more common. The excavation depth of foundation pits is increasing, and the distance between the sidewalls of foundation pits and surrounding buildings and structures is getting smaller and smaller. The difficulty of foundation pit construction is increasing, and the problems that need to be solved are also increasing. Interlocking piles are widely used in foundation pit construction because they have both support and water-stopping functions and their unit price is lower than that of underground continuous walls.

[0003] The piles are arranged with one reinforced concrete pile (Pile A) and one plain concrete pile (Pile B) alternately. During construction, taking advantage of the super-retarded setting property of concrete, Piles B are constructed first, and Piles A are constructed before the concrete of Piles B solidifies. During the construction of Piles A, a full-casing drilling rig is used to cut away the concrete at the intersection with the adjacent Piles B, achieving interlocking between Piles A and B.

[0004] During the construction of bored interlocking piles, due to unstable quality of the ultra-retarded concrete in pile B, premature setting, or mechanical equipment failure, the construction of the bored interlocking piles could not proceed as required, resulting in piles that had solidified and could not be cut, thus forming accident piles. One current approach to handling accident piles is to shift the position of pile A when one side of pile B cannot be cut, allowing the casing drilling rig to cut the adjacent pile B on one side to construct pile A (removing the original guide wall and strictly controlling the pile position). An additional jet grouting pile is then added outside the uncut piles B and A as a waterproofing treatment. However, using jet grouting piles for waterproofing has drawbacks: firstly, the waterproofing effect of jet grouting piles is inferior to that between piles; secondly, it easily pollutes the environment; and thirdly, it has high work requirements and is costly. Summary of the Invention

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of the invention, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0006] Therefore, the purpose of this invention is to provide a seepage prevention system for interlocking piles in foundation pit engineering. Under the action of the water-blocking structure, a concrete pile can be poured in the area not covered by the reinforced concrete pile D position of pile A for the concrete pile E position. In this way, the concrete pile can re-interlock with the plain concrete pile B, which cannot be cut, so that the waterproof effect is good and the cost is low.

[0007] To solve the above-mentioned technical problems, the present invention provides a seepage prevention system for interlocking piles in foundation pit engineering, adopting the following technical solution: It includes a guide wall, the surface of which has multiple spaced reinforced concrete A pile C positions and plain concrete B2 pile positions. Plain concrete B2 piles are arranged inside the plain concrete B2 pile positions. Plain concrete B2 piles that cannot be cut are designated as plain concrete B1 piles. An interlocking portion is formed on one side of the plain concrete B2 pile adjacent to the plain concrete B1 pile. Reinforced concrete A pile D positions are formed on the guide wall, overlapping with the interlocking portions. Reinforced concrete A piles are arranged inside the reinforced concrete A pile D positions. Each reinforced concrete A pile includes a reinforcing cage and a water-blocking structure. The water-blocking structure is located inside the reinforced concrete A pile D positions along with the reinforcing cage. The area not covered by the reinforced concrete A pile D positions, including the area of ​​the reinforced concrete A pile C position, is designated as a concrete pile E position. A concrete pile is installed within the concrete pile E position, and the plain concrete B1 piles are re-interlocked through the concrete piles.

[0008] Optionally, the reinforced concrete pile C position and the plain concrete pile B2 position of the guide wall are removed, and the reinforced concrete pile D position is opened between the reinforced concrete pile C position and the plain concrete pile B2 position. The reinforced concrete pile C position includes the concrete pile E position that is not covered by the reinforced concrete pile D position.

[0009] Optionally, the water-blocking structure includes a water-retaining pile, with multiple discharge holes on one side wall of the water-retaining pile, the interior of the water-retaining pile being hollow, and a grouting hole being opened at the top of the water-retaining pile, with a sealing cap threaded onto the grouting hole.

[0010] Optionally, the water-retaining piles are arranged along the length of the reinforcing cage, and one side wall of the water-retaining piles is welded to the reinforcing cage.

[0011] Optionally, the water-retaining pile has an arc-shaped structure, the vertical center plane of the plain concrete B1 pile passes through the vertical center plane of the water-retaining pile, and the discharge holes on the water-retaining pile are symmetrically arranged on both sides of the vertical center plane.

[0012] Optionally, the outer diameter of the water-retaining pile and the steel cage after connection is not greater than the inner diameter of the casing, and the outer arc surface of the water-retaining pile fits the inner diameter of the casing.

[0013] The aforementioned seepage prevention system for interlocking piles in foundation pit engineering further includes a seepage prevention method, comprising:

[0014] Step 1: Multiple reinforced concrete piles (A-position C) and plain concrete piles (B2-position B) are spaced along the surface of the guide wall. After the guide wall constructed first reaches the required strength, the casing drilling rig is moved so that the center of the casing drilling rig's pipe reporting device is positioned corresponding to the center of the hole in the guide wall.

[0015] Step 2: First, press the casing into the adjacent plain concrete B2 pile positions on both sides. Then, use a grab bucket to remove soil from inside the casing while pressing the casing down. The bottom of the casing must always be kept at least 2.5 meters above the soil removal surface. During this process, use a hammer ball to check the verticality of the hole. If the verticality deviation exceeds the design value, the hole opening needs to be backfilled and the casing removed for correction. If the verticality meets the design requirements, install the second casing section and continue pressing down to remove soil until the design bottom elevation of the hole is reached. Then, pour ultra-slow-setting concrete into the plain concrete B2 pile positions.

[0016] Step 3: During the drilling of reinforced concrete pile A at position C, if the concrete of plain concrete pile B1 on one side has already solidified, preventing the casing drilling rig from cutting the interlocking plain concrete pile B1 as required, the reinforced concrete pile A at position C and the plain concrete pile B2 at position B2 of the guide wall are removed, and the reinforced concrete pile A at position D is opened between the reinforced concrete pile A at position C and the plain concrete pile B2; thus allowing the casing drilling rig to cut the plain concrete pile B2 on one side.

[0017] Step 4: After the hole is inspected and found to be qualified, the steel cage is hoisted and placed. The water-blocking structure enters the interior of the reinforced concrete pile A at position D along with the steel cage. The steel cage is rotated so that the water-blocking structure is located on one side of the plain concrete pile B1.

[0018] Step 5: After the casing, reinforcing cage, and water-blocking structure are installed in place, immediately carry out the first concrete pouring at position D of reinforced concrete pile A; after the pouring is completed, remove the casing.

[0019] Step 6: Open the sealing cover above the water-retaining pile and carry out the second concrete pouring operation through the grouting hole. The concrete is transported to both sides through the discharge hole of the water-retaining pile and poured into position E of the concrete pile.

[0020] In summary, the present invention has at least one of the following beneficial effects:

[0021] In this invention, when a plain concrete B pile on one side cannot be cut during the construction of a reinforced concrete A pile, an interlocking part is opened on one side of an adjacent plain concrete B pile. A reinforced concrete A pile D position, overlapping the interlocking part, is then opened on the guide wall. A reinforced concrete A pile is arranged inside the reinforced concrete A pile D position, which includes a reinforcing cage and a water-blocking structure. The area of ​​the reinforced concrete A pile C position, which is not covered by the reinforced concrete A pile D position, is designated as the concrete pile E position. Under the action of the water-blocking structure, a concrete pile can be poured into the concrete pile E position. In this way, the concrete pile achieves re-interlocking with the uncut plain concrete B pile, resulting in good waterproofing and low cost. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used 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 those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the reinforced concrete pile A at position C, plain concrete pile B2 at position B2, reinforced concrete pile A at position D, and concrete pile E on the guide wall of the present invention.

[0025] Figure 3 For the present invention Figure 1 The reinforced concrete pile A is a structural schematic diagram before pouring;

[0026] Figure 4 This is a schematic diagram of the water-blocking structure of the present invention.

[0027] Explanation of reference numerals in the attached drawings: 1. Guide wall; 101. Reinforced concrete pile A, position C; 102. Plain concrete pile B2, position; 103. Reinforced concrete pile A, position D; 104. Concrete pile E, position; 2. Plain concrete pile B2; 201. Interlocking part; 3. Plain concrete pile B1; 4. Reinforced concrete pile A; 401. Reinforcing cage; 402. Water-blocking structure; 402a. Water-retaining pile; 402b. Discharge hole; 402c. Grouting hole; 402d. Sealing cap; 5. Concrete pile. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0029] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] Example 1

[0032] Reference Figures 1-3 This invention discloses a seepage prevention system for interlocking piles in foundation pit engineering, including a guide wall 1. The surface of the guide wall 1 has multiple spaced reinforced concrete A-piles C positions 101 and plain concrete B2-piles 102. The plain concrete B2-piles 102 are used to form plain concrete B2 piles 2 by pressing in a casing and injecting super-retarded concrete after soil extraction. If, during construction, one side of the plain concrete B2 pile 2 cannot be cut, this uncut plain concrete B2 pile 2 is designated as a plain concrete B1 pile 3. Then, an interlocking portion 201 is formed on one side of the plain concrete B2 pile 2 adjacent to the plain concrete B1 pile 3. A reinforced concrete A-piles D position 103 overlapping the interlocking portion 201 is formed on the guide wall 1. Reinforced concrete A-piles 4 are arranged inside the reinforced concrete A-piles D position 103. The interlocking portion 201 has a larger interlocking area than the normal interlocking area between reinforced concrete columns and plain concrete piles; however, after pouring, the reinforced concrete A-piles 4 and plain concrete B2 piles 2 can interlock.

[0033] The reinforced concrete pile A 4 includes a reinforcing cage 401 and a water-blocking structure 402. The water-blocking structure 402 is located inside the reinforced concrete pile D position 103 along with the reinforcing cage 401. That is, when the reinforcing cage 401 is hoisted into the casing, the water-blocking structure 402 will also enter the casing along with the reinforcing cage 401. The area of ​​the reinforced concrete pile C position 101 that is not covered by the reinforced concrete pile D position 103 is the concrete pile E position 104. Under the action of the water-blocking structure 402, a concrete pile 5 can be poured in the concrete pile E position 104. In this way, the plain concrete pile B1 3 is re-interlocked through the concrete pile 5, which has a good waterproof effect and low cost.

[0034] When the plain concrete pile B2 on one side cannot be cut, it is necessary to cut the reinforced concrete pile A at position D103, referring to... Figure 2In detail, in this embodiment, the reinforced concrete A pile D position 103 is the reinforced concrete A pile C position 101 and plain concrete B2 pile position 102 that have been removed from the guide wall 1. The reinforced concrete A pile D position 103 is then re-excavated between the reinforced concrete A pile C position 101 and the plain concrete B2 pile position 102. Thus, the reinforced concrete A pile C position 101 is partially covered by the reinforced concrete A pile D position 103. The part not covered by the reinforced concrete A pile D position 103 is the concrete pile E position 104. By pouring a concrete pile 5 in the concrete pile E position 104, the plain concrete B1 pile 3 is re-interlocked through the concrete pile 5.

[0035] Reference Figure 4 In this embodiment, the water-blocking structure 402 includes a water-blocking pile 402a. A plurality of discharge holes 402b are opened on one side wall of the water-blocking pile 402a. The interior of the water-blocking pile 402a is hollow. A grouting hole 402c is opened at the top of the water-blocking pile 402a. A sealing cap 402d is threaded onto the grouting hole 402c. The water-blocking pile 402a is mainly used to pour concrete into the concrete pile E position 104 to form the concrete pile 5. When it is necessary to pour concrete into the concrete pile E position 104, the sealing cap 402d is opened to expose the grouting hole 402c. Then, concrete is injected into the water-blocking pile 402a through an external grouting device. The concrete is then transported to the concrete pile E position 104 through the discharge hole 402b.

[0036] Among them, the water-retaining pile 402a is arranged along the length of the steel cage 401. One side wall of the water-retaining pile 402a is welded to the steel cage 401, so that the water-retaining pile 402a can move with the steel cage 401, and the water-retaining pile 402a itself can also play a part in blocking water.

[0037] Among them, the vertical center plane of plain concrete pile B1 3 can pass through the vertical center plane of water-retaining pile 402a. The discharge holes 402b on the water-retaining pile 402a are symmetrically arranged on both sides of the vertical center plane to realize the rapid pouring of concrete.

[0038] The outer diameter of the water-retaining pile 402a and the reinforcing cage 401 after connection is not greater than the inner diameter of the casing, so that the water-retaining pile 402a and the reinforcing cage 401 can be suspended in the casing after connection. The water-retaining pile 402a has an arc-shaped structure, and the inner arc surface of the water-retaining pile 402a can be fixed with multiple reinforcing bars on the reinforcing cage 401 at the same time. The outer arc surface of the water-retaining pile 402a fits with the inner diameter of the casing, so as to avoid the concrete flowing back into the water-retaining pile 402a through the grouting hole 402c during the first concrete pouring of reinforced concrete pile A at position D 103, which would affect the second concrete pouring of concrete pile E at position 104.

[0039] Example 2

[0040] Based on the same concept as in Embodiment 1 above, this seepage prevention system applied to interlocking piles in foundation pit engineering also includes a seepage prevention method, comprising:

[0041] Step 1: Multiple reinforced concrete piles C position 101 and plain concrete piles B2 position 102 are arranged at intervals along the surface of the guide wall 1. After the guide wall 1 constructed first reaches the required strength, the casing drilling rig is moved so that the center of the casing drilling rig's pipe reporting device is positioned at the center of the hole position in the guide wall 1.

[0042] Step 2: First, press the casing into the adjacent plain concrete B2 pile position 102 on both sides. Then, use a grab bucket to remove soil from the casing while pressing the casing down. The bottom of the casing must always be kept more than 2.5 meters above the soil removal surface. During this process, use a hammer ball to check the verticality of the hole. If the verticality deviation exceeds the design value, the hole opening needs to be backfilled and the casing removed for correction. If the verticality meets the design requirements, install the second casing section and continue pressing down to remove soil until the design bottom elevation of the hole is reached. Then, pour ultra-slow-setting concrete into the plain concrete B2 pile position 102.

[0043] Step 3: During the drilling of reinforced concrete pile A at position C 101, if the concrete of plain concrete pile B1 3 on one side has already solidified, preventing the casing drilling rig from cutting and engaging plain concrete pile B1 3 as required, the reinforced concrete pile A at position C 101 and plain concrete pile B2 at position 102 of the guide wall 1 will be removed, and a reinforced concrete pile A at position D 103 will be opened between the reinforced concrete pile A at position C 101 and plain concrete pile B2 at position 102; this will allow the casing drilling rig to cut plain concrete pile B2 2 on one side.

[0044] Step 4: After the hole is inspected and found to be qualified, the steel cage 401 is hoisted and lowered. The water-blocking structure 402 enters the interior of the reinforced concrete pile A at position D 103 along with the steel cage 401. The steel cage 401 is rotated so that the water-blocking structure 402 is located on one side of the plain concrete pile B1 3.

[0045] Step 5: After the casing, reinforcing cage 401 and water-blocking structure 402 are installed in place, immediately carry out the first concrete pouring of reinforced concrete pile A at position D 103; after the pouring is completed, remove the casing.

[0046] Step 6: Open the sealing cover 402d above the water-retaining pile 402a, and carry out the second concrete pouring operation through the grouting hole 402c. The concrete is transported to both sides through the discharge hole 402b of the water-retaining pile 402a, and the concrete is used to pour concrete into position E 104 of the concrete pile.

[0047] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A seepage prevention system for interlocking piles in foundation pit engineering, comprising a guide wall (1), wherein the surface of the guide wall (1) has multiple spaced reinforced concrete A pile C positions (101) and plain concrete B2 pile positions (102), and plain concrete B2 piles (2) arranged inside the plain concrete B2 pile positions (102), wherein uncut plain concrete B2 piles (2) are designated as plain concrete B1 piles (3), characterized in that: An interlocking part (201) is provided on one side of the plain concrete B2 pile (2) adjacent to the plain concrete B1 pile (3). A reinforced concrete A pile D position (103) overlapping the interlocking part (201) is provided on the guide wall (1). A reinforced concrete A pile (4) is arranged inside the reinforced concrete A pile D position (103). The reinforced concrete A pile (4) includes a steel cage (401) and a water-blocking structure (402). The water-blocking structure (402) is located inside the reinforced concrete A pile D position (103) along with the steel cage (401). The reinforced concrete A pile C position (101) includes a concrete pile E position (104) in the area not covered by the reinforced concrete A pile D position (103). A concrete pile (5) is provided in the concrete pile E position (104). The plain concrete B1 pile (3) is re-interlocked through the concrete pile (5).

2. The seepage prevention system for interlocking piles in foundation pit engineering according to claim 1, characterized in that: Remove the reinforced concrete A pile C position (101) and plain concrete B2 pile position (102) of the guide wall (1), and open the reinforced concrete A pile D position (103) between the reinforced concrete A pile C position (101) and plain concrete B2 pile position (102). The reinforced concrete A pile C position (101) includes the concrete pile E position (104) that is not covered by the reinforced concrete A pile D position (103).

3. The seepage prevention system for interlocking piles in foundation pit engineering according to claim 1, characterized in that: The water-blocking structure (402) includes a water-blocking pile (402a), a plurality of discharge holes (402b) are opened on one side wall of the water-blocking pile (402a), the interior of the water-blocking pile (402a) is hollow, and a grouting hole (402c) is opened on the top of the water-blocking pile (402a), and a sealing cap (402d) is threaded onto the grouting hole (402c).

4. The seepage prevention system for interlocking piles in foundation pit engineering according to claim 3, characterized in that: The water-retaining pile (402a) is arranged along the length of the steel cage (401), and one side wall of the water-retaining pile (402a) is welded to the steel cage (401).

5. A seepage prevention system for interlocking piles in foundation pit engineering according to claim 4, characterized in that: The water-retaining pile (402a) has an arc-shaped structure. The vertical center plane of the plain concrete B1 pile (3) passes through the vertical center plane of the water-retaining pile (402a). The discharge holes (402b) on the water-retaining pile (402a) are symmetrically arranged on both sides of the vertical center plane.

6. A seepage prevention system for interlocking piles in foundation pit engineering according to claim 5, characterized in that: The outer diameter of the water-retaining pile (402a) and the steel cage (401) after connection is not greater than the inner diameter of the casing, and the outer arc surface of the water-retaining pile (402a) fits the inner diameter of the casing.

7. A seepage prevention system for interlocking piles in foundation pit engineering according to any one of claims 1-6, characterized in that: It also includes a water-proofing method, comprising: Step 1: Multiple reinforced concrete A pile C position (101) and plain concrete B2 pile position (102) are arranged at intervals along the surface of the guide wall (1). After the guide wall (1) constructed first reaches the required strength, the casing drilling rig is moved so that the center of the casing drilling rig's pipe reporting device is positioned at the center of the hole position in the guide wall (1). Step 2: First, press the casing into the adjacent plain concrete B2 pile position (102) on both sides. Then, use a grab bucket to remove soil from the casing while pressing the casing down. The bottom of the casing must always be kept more than 2.5 meters away from the soil removal surface. During this period, use a hammer ball to check the verticality of the hole. If the verticality deviation exceeds the design value, the hole opening needs to be backfilled and the casing removed for correction. If the verticality meets the design requirements, install the second section of casing and continue pressing down to remove soil until the design bottom elevation of the hole is reached. Then, pour ultra-slow-setting concrete into the plain concrete B2 pile position (102). Step 3: During the drilling of reinforced concrete pile C position (101), if the concrete of plain concrete pile B1 (3) on one side has solidified, the casing drilling rig cannot cut the interlocking plain concrete pile B1 (3) as required. The reinforced concrete pile C position (101) and plain concrete pile B2 position (102) of the guide wall (1) are removed, and the reinforced concrete pile D position (103) is opened between the reinforced concrete pile C position (101) and plain concrete pile B2 position (102); so that the casing drilling rig can cut plain concrete pile B2 (2) on one side. Step 4: After the hole is inspected and found to be qualified, the steel cage (401) is hoisted and placed. The water-blocking structure (402) enters the interior of the reinforced concrete pile D position (103) along with the steel cage (401). The steel cage (401) is rotated so that the water-blocking structure (402) is located on one side of the plain concrete pile B1 (3). Step 5: After the casing, reinforcing cage (401) and water-blocking structure (402) are installed in place, immediately carry out the first concrete pouring of reinforced concrete pile D position (103); after the pouring is completed, remove the casing. Step 6: Open the sealing cover (402d) above the water-retaining pile (402a), and carry out the second concrete pouring operation through the grouting hole (402c). The concrete is transported to both sides through the discharge hole (402b) of the water-retaining pile (402a), and the concrete is used to pour concrete into position E (104) of the concrete pile.

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