Deep foundation pit occlusion cast-in-place pile type foundation pit supporting structure

Abstract

The invention belongs to the technical field of occluded cast-in-place pile construction, and particularly relates to a deep foundation pit occluded cast-in-place pile type foundation pit supporting structure which comprises a plurality of plain holes and reinforced holes, the adjacent plain holes and reinforced holes are occluded with each other, a reinforcement cage is mounted in an inner cavity of each reinforced hole, and the reinforcement cage and the reinforced holes are meshed with each other. The anti-collapse pile is characterized in that an anti-collapse piece used for preventing the pile hole from collapsing is detachably installed in an inner cavity of one pile hole, and a sludge layer or a sand layer in the pile hole can be blocked through the anti-collapse piece. According to the anti-collapse pile, the anti-collapse piece can be tightly attached to the inner wall of the pile hole, horizontal pressure is provided for the silt layer or the sand layer in the pile hole, the situation that the silt layer or the sand layer collapses or shrinks is prevented, the silt layer or the sand layer is prevented from being mixed with concrete being poured to form a silt inclusion layer or a sand inclusion layer, and the pile body is prevented from being of a sectional structure; the overall strength of the pile body is improved, and pile body cracking caused by stress concentration generated by pile body stress is avoided.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of construction of bite cast-in-place piles, in particular to a deep foundation pit bite cast-in-place pile type foundation pit support structure. BACKGROUND

[0002] The deep foundation pit bite cast-in-place pile type foundation pit support structure is a support form that forms a continuous and seamless underground wall by cutting and interlocking adjacent reinforced concrete piles (divided into "plain piles" and "meat piles") to realize the dual functions of retaining soil and stopping water during foundation pit excavation. The core feature is that the piles are tightly connected through the construction process, replacing the traditional combination of underground continuous walls or pile rows + water stopping curtain, and it is suitable for deep foundation pit engineering under complex geological conditions such as soft soil and water-rich conditions.

[0003] At present, the deep foundation pit bite pile faces a series of interrelated challenges during construction, especially in unstable strata such as silt and sand layers. After the pile hole for installing the "plain pile" is punched, it is necessary to promptly fill the pile hole with concrete. When the concrete is filled into the pile hole, the concrete will impact the inner wall of the pile hole (forming horizontal extrusion force on the silt layer and sand layer of the hole wall), which can easily cause the inner wall of the pile hole to collapse or shrink. If the silt layer or sand layer collapses or shrinks locally, a large amount of soil and sand will flow into the pile hole and mix with the concrete being poured. These impurities cannot be completely wrapped or discharged by the concrete, and will form a silt layer or sand layer in the pile body. This defect will make the pile body become a "segmented" structure, not only reducing the overall strength, but also causing stress concentration when stressed, which can easily cause the pile body to crack.

[0004] Therefore, the present application provides a deep foundation pit bite cast-in-place pile type foundation pit support structure. SUMMARY

[0005] In order to make up for the deficiencies of the prior art and solve at least one technical problem raised in the background art.

[0006] The technical scheme adopted by the present application to solve its technical problems is: the deep foundation pit bite cast-in-place pile type foundation pit support structure of the present application comprises a plurality of "plain holes" and "meat holes", wherein adjacent "plain holes" and "meat holes" interlock with each other, and a steel cage is installed in the inner cavity of the "meat hole", characterized in that: the inner cavity of one of the pile holes is detachably installed with an anti-collapse piece for preventing the pile hole from collapsing, which can block the silt layer or sand layer inside the pile hole to prevent the silt layer or sand layer from collapsing when the concrete is poured. The anti-collapse piece comprises an assembly plate one and a connecting plate, the two ends of the assembly plate one are symmetrically fixedly installed with the connecting plates, the ends of the adjacent two connecting plates away from the assembly plate one are fixedly installed with an assembly plate two, and the assembly plate one and the assembly plate two are arranged in the inner cavity of the "plain hole".

[0007] Both assembly plate one and assembly plate two are bent, and their central axes coincide. The sides of assembly plate one and assembly plate two that are far apart from each other are attached to the inner wall of the "plain hole".

[0008] The anti-collapse components also include threaded steel bars and baffles. One end of both assembly plate one and assembly plate two is provided with a ring-shaped distribution of through holes that communicate with the other end of the assembly plate. Threaded steel bars can be detachably installed in the inner cavity of the multiple through holes. Baffles can be detachably installed on the side of assembly plate one and assembly plate two that are far apart from each other.

[0009] The baffle is bent and the curvature of the baffle is the same as that of the assembly plate. Multiple fixing rings are fixedly installed on one side of the baffle, and deformation grooves that are compatible with the threaded steel bars are opened on the side of the fixing rings away from the baffle.

[0010] The threaded steel bar is slidably sleeved with multiple assembly plates one and two along its own axis. Each pair of adjacent assembly plates one and two assembly plates two can be detachably installed with a baffle. Limiting blocks are fixedly installed at both the upper and lower ends of the baffle. Each pair of adjacent assembly plates one and two assembly plates two have symmetrically opened limiting grooves that are adapted to the limiting blocks on one side.

[0011] Each of the two adjacent connecting plates can be detachably installed with a partition. Positioning blocks are fixedly installed at both the upper and lower ends of the partition. Each of the two adjacent connecting plates has a positioning groove that matches the positioning block on one side. The positioning block has an installation hole on one side. A limit bolt can be detachably installed in the inner cavity of the installation hole. The inner wall of the positioning groove has a threaded hole that matches the limit bolt.

[0012] The connecting plate is bent towards the central axis of the assembly plate, and the curvature of the partition and the connecting plate is the same.

[0013] The bottom of the threaded steel bar is located in the bottom of the assembly plate 1 and the top of the assembly plate 2. The inner cavity of the assembly plate 1 is fixedly installed with a fixed tube. The inner cavity of the multiple fixed tubes is fixedly installed with multiple elastic plates in a ring. The bottom of the multiple elastic plates is fixedly installed with a compression plate. The multiple fixed tubes and multiple elastic plates are bent and have the same curvature.

[0014] Multiple extrusion plates are fixedly installed in a ring on one side of the fixed tube, and multiple blocking blocks are installed on the side of the multiple blocking blocks away from the extrusion plates in a direction away from the extrusion plates.

[0015] The beneficial effects of this invention are as follows: 1. The anti-collapse component can fit tightly against the inner wall of the pile hole and provide horizontal pressure to the silt or sand layer inside the pile hole, preventing the silt or sand layer from collapsing or shrinking. It also prevents the silt or sand layer from mixing with the concrete being poured to form a mud or sand layer, prevents the pile from becoming a "segmented" structure, improves the overall strength of the pile, and avoids stress concentration in the pile that could lead to cracking.

[0016] 2. When one end of the threaded steel bar is inserted into the inner cavity of the fixed pipe, the free ends of multiple blocking blocks abut against the outer surface of the threaded steel bar, thereby playing a unidirectional limiting role on the threaded steel bar, preventing the threaded steel bar from being pulled out of the fixed pipe, and preventing multiple sets of assembly plates one and two from detaching from the outside of the threaded steel bar, so that the threaded steel bar and assembly plates one and two can be smoothly lowered into the pile hole. Attached Figure Description

[0017] The invention will now be further described with reference to the accompanying drawings.

[0018] Figure 1 This is a perspective view of the present invention; Figure 2 This is an assembly drawing of the baffle and assembly plate one of the present invention; Figure 3 This is an assembly diagram of the fixing tube and the extrusion plate of the present invention; Figure 4 This is an assembly drawing of the baffle and limiting block of the present invention; Figure 5 This is an assembly drawing of the partition and positioning block of the present invention; Figure 6 This is an assembly drawing of the extrusion plate and the blocking block of the present invention; Figure 7 This is the present invention. Figure 2 Enlarged view of the structure at point A in the middle; Figure 8 This is the present invention. Figure 2 Enlarged view of the structure at point B in the middle.

[0019] In the picture: 1. Assembly plate 1; 2. Baffle; 3. Partition; 4. Connecting plate; 5. Fixing tube; 6. Elastic plate; 7. Extrusion plate; 8. Limiting block; 9. Fixing ring; 10. Limiting groove; 11. Positioning groove; 12. Positioning block; 13. Blocking block. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0021] like Figures 1-8As shown, the embodiments of the present invention include multiple "plain holes" and "interlocking holes," wherein adjacent "plain holes" and "interlocking holes" interlock with each other. A reinforcing cage is installed inside the cavity of each "interlocking hole." When drilling pile holes in the ground, a "plain hole" is first drilled using foundation piles. Then, two partition plates (with bent end faces) are symmetrically placed inside the "plain hole." Concrete is then poured into the "plain hole." After the concrete has solidified for a period of time, the two partition plates are removed from the "plain hole," creating a cavity with the same shape as the partition plates inside. Next, an "interlocking hole" is drilled next to the "plain hole," communicating with the cavity formed by the partition plates. After the "interlocking hole" is drilled, the reinforcing cage is lowered into the cavity of the "interlocking hole" until its bottom contacts the bottom of the cavity. Then, concrete is poured into the "interlocking hole" until the concrete completely encloses the reinforcing cage, thus achieving the interlocking of the "plain pile" and the "interlocking pile" (e.g., ...). Figure 1 As shown), a continuous and seamless underground wall is ultimately formed to achieve a support form that serves the dual functions of retaining soil and stopping water during foundation pit excavation (this is existing technology and will not be elaborated on here).

[0022] A connecting plate 4 is symmetrically fixed at both ends of the assembly plate 1. An assembly plate 2 is fixedly installed at the end of each of the two adjacent connecting plates 4 away from the assembly plate 1. The assembly plates 1 and 2 are set in the inner cavity of the "plain hole". The assembly plates 1 and 2 are both curved and their central axes coincide. The side of the assembly plates 1 and 2 that is away from each other is in contact with the inner wall of the "plain hole". After the "plain hole" is opened, the assembly plates 1 and 2 are lowered to the bottom of the inner cavity of the "plain hole". At the same time, the side of the assembly plates 1 and 2 that is away from each other is in contact with the inner wall of the "plain hole". The assembly plates 1 and 2 can provide horizontal extrusion force to the inner wall of the "plain hole" to prevent the soil on the inner wall of the "plain hole" from falling off and mixing with the concrete.

[0023] Both Assembly Plate 1 and Assembly Plate 2 have a ring-shaped distribution of through holes at one end, which are connected to the other end of the assembly plate. Threaded steel bars can be detachably installed in the inner cavity of multiple through holes. Baffles 2 can be detachably installed on the opposite sides of Assembly Plate 1 and Assembly Plate 2. Multiple Assembly Plates 1 and Assembly Plate 2 are slidably sleeved along their own axis. Baffles 2 can be detachably installed between two adjacent Assembly Plates 1 and Assembly Plate 2. Multiple threaded steel bars are symmetrically arranged with the central axis of Assembly Plates 1 and Assembly Plate 2 as the center of symmetry. The outer surfaces of the symmetrically arranged multiple threaded steel bars are slidably sleeved with Assembly Plates 1 and Assembly Plate 2 respectively. Then, baffles 2 are placed between two adjacent Assembly Plates 1 and Assembly Plate 2. Under the action of baffles 2, the area of ​​the inner wall of the "plain hole" can be increased.

[0024] Multiple fixing rings 9 are fixedly installed on one side of the baffle 2. The side of the fixing rings 9 away from the baffle 2 has a deformation groove adapted to the threaded steel bars. When the baffle 2 is placed between two adjacent assembly plates 1 and two assembly plates 2, the multiple fixing rings 9 installed on one side of the baffle 2 are sleeved on the outside of the multiple threaded steel bars through the deformation groove. At the same time, the inner wall of the fixing ring 9 is in contact with the outer wall of the threaded steel bars, which can achieve the purpose of limiting the position of the baffle 2, so that the baffle 2 can be stably installed between two adjacent assembly plates 1 and two assembly plates 2.

[0025] The baffle 2 is curved, and the curvature of the baffle 2 is the same as that of the assembly plate 1. When the baffle 2 enters the "plain hole" along with the assembly plate 1 and the assembly plate 2, the outer surface of the baffle 2 and the inner wall of the "plain hole" are completely in contact. The inner wall of the "plain hole" can be squeezed by multiple baffles 2 to prevent the silt layer or sand layer from collapsing or shrinking. It also prevents the silt layer or sand layer from mixing with the concrete being poured to form a mud layer or sand layer, prevents the pile from becoming a "segmented" structure, improves the overall strength of the pile, and avoids stress concentration in the pile body, which can lead to cracking.

[0026] Limiting blocks 8 are fixedly installed at both the upper and lower ends of the baffle 2. Each of the two adjacent assembly plates 1 and 2 has a limiting groove 10 that matches the limiting block 8. After the baffle 2 is installed between the two adjacent assembly plates 1 and 2, the two sides of the baffle 2 are flush with the two sides of the assembly plates 1 and 2. The limiting blocks 8 installed at the top and bottom of the multiple baffles 2 enter the inner cavity of the limiting groove 10, thereby limiting the baffle 2 and preventing the baffle 2 from moving upward when it moves downward in the "plain hole", thus improving the stability of the baffle 2.

[0027] Each pair of adjacent connecting plates 4 is detachably fitted with a partition 3. Positioning blocks 12 are fixedly installed at both the upper and lower ends of the partition 3. Each pair of adjacent connecting plates 4 has a positioning groove 11 on one side that matches the positioning block 12. One side of the positioning block 12 has a mounting hole, in which a limit bolt can be detachably installed. The inner wall of the positioning groove 11 has a threaded hole that matches the limit bolt. The connecting plates 4 are bent towards the central axis of the assembly plate 1. The partition 3 and the connecting plates 4 have the same curvature. After the baffle 2 is installed, the partition 3 is installed between each pair of adjacent connecting plates 4. At this time, the positioning blocks 12 at both ends of the partition 3 are inserted... Insert the bolts into the inner cavity of the positioning groove 11 until the central axes of the multiple mounting holes and multiple threaded holes coincide. Then, insert the small ends of the multiple limit bolts into the inner cavity of the mounting holes until the small ends of the multiple limit bolts enter the inner cavity of the threaded holes. Then, continuously rotate the large ends of the limit bolts until the large ends of the limit bolts are in contact with the outer wall of the positioning block 12. This will fix the partition 3 between two adjacent connecting plates 4. When the reinforcing cage is lowered into the "hole", the outer wall of the reinforcing cage and the outer wall of the partition 3 are in contact. When concrete is poured into the "hole", the poured concrete adheres to the outer surface of the partition 3, thus achieving the interlocking of the "plain pile" and the "impure pile".

[0028] In this assembly, fixing tubes 5 are fixedly installed in the interpenetration holes at the bottom of the threaded steel bars and at the top of the assembly plates 1 and 2. Multiple elastic plates 6 are fixedly installed in a ring-shaped arrangement in the inner cavity of the fixing tubes 5. Extrusion plates 7 are fixedly installed at the bottom of the multiple elastic plates 6. The multiple fixing tubes 5 and multiple elastic plates 6 are bent and have the same curvature. When the bottom of multiple threaded steel bars is simultaneously inserted into the inner cavity of the fixing tubes 5 installed at the bottom of the assembly plates 1 and 2, the outer surface of the threaded steel bars contacts the outer surface of the multiple extrusion plates 7 and compresses the extrusion plates 7, thereby increasing the friction between the extrusion plates 7 and the outer wall of the threaded steel bars.

[0029] Both the elastic plate 6 and the compression plate 7 are made of metal spring sheets. At the same time, the ends of the multiple elastic plates 6 and the compression plate 7 are connected to each other and move closer to the central axis of the fixed tube 5, so that the compression plate 7 is suspended. This allows the elastic plates 6 and the compression plate 7 to deform after being compressed by the threaded steel bar, so that one end of the threaded steel bar can be smoothly inserted into the inner cavity of the fixed tube 5, reducing the smoothness of the threaded steel bar insertion into the fixed tube 5.

[0030] Multiple extrusion plates 7 are arranged in a ring on one side near the central axis of the fixed pipe 5, and multiple blocking blocks 13 are fixedly installed. The side of the multiple blocking blocks 13 away from the extrusion plates 7 is inclined away from the extrusion plates 7. When one end of the threaded steel bar is inserted into the inner cavity of the fixed pipe 5, the free ends of the multiple blocking blocks 13 abut against the outer surface of the threaded steel bar, thereby playing a unidirectional limiting role for the threaded steel bar, preventing the threaded steel bar from being pulled out from the inside of the fixed pipe 5, and preventing multiple sets of assembly plates 1 and 2 from detaching from the outside of the threaded steel bar, so that the threaded steel bar and assembly plates 1 and 2 can be smoothly lowered into the pile hole.

[0031] The assembly plate 1, assembly plate 2, baffle 2, threaded steel bar, connecting plate 4, and partition 3 constitute the anti-collapse component. The anti-collapse component can fit tightly with the inner wall of the pile hole and provide horizontal pressure to the silt or sand layer inside the pile hole, preventing the silt or sand layer from collapsing or shrinking, avoiding the silt or sand layer from mixing with the concrete being poured to form a mud or sand layer, preventing the pile body from becoming a "segmented" structure, improving the overall strength of the pile body, and avoiding stress concentration in the pile body that could lead to cracking.

[0032] The terms "front," "back," "left," "right," "top," and "bottom" all refer to the figures in the accompanying drawings. Figure 1 Based on the perspective of the observer, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0033] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and 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 limiting the scope of protection of this invention.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A deep foundation pit interlocking cast-in-place pile type foundation pit support structure, comprising multiple "plain holes" and "interlocking holes", wherein adjacent "plain holes" and "interlocking holes" interlock with each other, and wherein a reinforcing cage is installed in the inner cavity of the "interlocking hole", characterized in that: One of the pile holes has a detachable anti-collapse component installed in its inner cavity to prevent the pile hole from collapsing. The anti-collapse component can block the silt or sand layer inside the pile hole to prevent the silt or sand layer from collapsing during concrete pouring. The anti-collapse component includes an assembly plate (1) and a connecting plate (4). The connecting plates (4) are symmetrically fixed at both ends of the assembly plate (1). An assembly plate (2) is fixedly installed at the end of each of the two adjacent connecting plates (4) away from the assembly plate (1). The assembly plate (1) and the assembly plate (2) are located in the inner cavity of the "plain hole".

2. The deep foundation pit interlocking cast-in-place pile type foundation pit support structure according to claim 1, characterized in that: Both assembly plate one (1) and assembly plate two are bent, and the central axes of assembly plate one (1) and assembly plate two coincide with each other. The side of assembly plate one (1) and assembly plate two that is far apart from each other is attached to the inner wall of the "plain hole".

3. The deep foundation pit interlocking cast-in-place pile type foundation pit support structure according to claim 1, characterized in that: The anti-collapse component also includes threaded steel bars and baffles (2). One end of the assembly plate 1 (1) and the assembly plate 2 are provided with through holes that are connected to the other end of the assembly plate 2 in a ring. Threaded steel bars can be detachably installed in the inner cavity of the multiple through holes. Baffles (2) can be detachably installed on the side of the assembly plate 1 (1) and the assembly plate 2 that are far apart from each other.

4. The deep foundation pit interlocking cast-in-place pile type foundation pit support structure according to claim 3, characterized in that: The baffle (2) is bent and the curvature of the baffle (2) is the same as that of the assembly plate (1). A plurality of fixing rings (9) are fixedly installed on one side of the baffle (2). The fixing rings (9) have deformation grooves that are compatible with the threaded steel bars on the side away from the baffle (2).

5. The deep foundation pit interlocking cast-in-place pile type foundation pit support structure according to claim 4, characterized in that: The threaded steel bar is slidably sleeved with multiple assembly plates one (1) and assembly plates two along its own axis. Each of the two adjacent assembly plates one (1) and the two assembly plates two can be detachably installed with a baffle (2). Both the upper and lower ends of the baffle (2) are fixedly installed with limit blocks (8). Each of the two adjacent assembly plates one (1) and the two assembly plates two has a symmetrically opened limit groove (10) that matches the limit block (8).

6. The deep foundation pit interlocking cast-in-place pile type foundation pit support structure according to claim 1, characterized in that: Each of the two adjacent connecting plates (4) can be detachably installed with a partition (3). The upper and lower ends of the partition (3) are fixedly installed with positioning blocks (12). Each of the two adjacent connecting plates (4) has a positioning groove (11) adapted to the positioning block (12) on one side. The positioning block (12) has an installation hole on one side. The inner cavity of the installation hole can be detachably installed with a limit bolt. The inner wall of the positioning groove (11) has a threaded hole adapted to the limit bolt.

7. The deep foundation pit interlocking cast-in-place pile type foundation pit support structure according to claim 6, characterized in that: The connecting plate (4) is bent toward the central axis of the assembly plate (1), and the curvature of the partition plate (3) and the connecting plate (4) is the same.

8. The deep foundation pit interlocking cast-in-place pile type foundation pit support structure according to claim 3, characterized in that: In the assembly plate 1 (1) at the bottom of the threaded steel bar and the top of the assembly plate 2, a fixed tube (5) is fixedly installed in the cavity of the through hole. In the cavity of the multiple fixed tubes (5), multiple elastic plates (6) are fixedly installed in a ring. A compression plate (7) is fixedly installed at the bottom of the multiple elastic plates (6). The multiple fixed tubes (5) and multiple elastic plates (6) are all bent, and the curvature of the multiple fixed tubes (5) and multiple elastic plates (6) is the same.

9. The deep foundation pit interlocking cast-in-place pile type foundation pit support structure according to claim 8, characterized in that: Multiple extrusion plates (7) are fixedly installed in a ring on one side of the central axis of the fixed tube (5) with multiple blocking blocks (13). The side of the multiple blocking blocks (13) away from the extrusion plates (7) is inclined away from the extrusion plates (7).

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