Miniature steel pipe pile and cast-in-place pile combined enclosure structure
Through the combined design of the micro steel pipe pile and cast-injected pile combination enclosure structure, the connection between the steel cage and the partition plate is used to form an integral part, which solves the problems of insufficient rigidity and construction complexity of steel pipe piles in foundation pit support, and reduces the problem of The cost and efficiency improvement effect are suitable for scenarios with limited support space.
Patent Information
- Application Number
- CN202420378788.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-28
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-02-28
AI Technical Summary
During the foundation pit support process, the traditional micro-steel pipe piles are insufficiently rigid and the construction of cast-injected piles is complicated, resulting in an extended construction period, an increase in construction cost, and limited support space, making it difficult to meet the needs of construction.
A combination of micro steel pipe piles and cast-in piles is adopted to form an integrated structure through vertically arranged steel cages and partition plates to achieve one-time molding, reducing construction costs and improving efficiency, and optimizing the construction process with positioning ribs and lubricating layers. , avoid problems of insufficient stiffness and construction complexity.
It effectively avoids the problem of insufficient rigidity of steel pipe piles, reduces construction processes and cost, and ensures construction safety and efficiency, and is suitable for scenarios with limited support space.
Smart Images
Figure CN222183368U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of building construction, in particular to a combined enclosure structure of micro steel pipe piles and cast-in-place piles. Background Art
[0002] Micro steel pipe piles and cast-in-place piles are currently one of the most widely used forms of foundation pit support. Micro steel pipe piles have strong environmental adaptability, flexible settings, small space occupation, and are economical and applicable, but their rigidity is relatively low; cast-in-place piles are relatively expensive, but they have high rigidity and strong deformation control capabilities. In addition, if the piles reach the top, there is a risk of broken piles during the construction of small municipal pipelines in the later stage.
[0003] With the acceleration of urbanization, land resources are becoming more and more precious. Building structures are making more and more full use of the space within the red line, and some underground mezzanines have structures such as cantilevered skylight wells, which further compresses the space for foundation pit support and makes it impossible to construct the crown beam. In this situation where the surrounding environmental conditions of the foundation pit are limited and there is no slope space, the traditional soil nail wall and anchor spraying support cannot meet the needs of the project; if the traditional pile anchor support is used, the support piles will conflict with local cantilevered structures such as skylight wells, and in the later small municipal construction, the support piles of a certain depth must be broken, which to a certain extent leads to greater construction difficulties, extended construction period, increased cost, etc. How to better solve the above problems has become the primary task at this stage.
[0004] There are three commonly used solutions at this stage: 1. Use micro steel pipe pile composite soil nail wall support: 1. This support form requires a large fertilizer trough to be reserved, and the amount of earth excavation and backfilling increases, which leads to an increase in construction cost; 2. This support form is suitable for situations where the stratum is good, the foundation pit depth is shallow, and the deformation requirements of the surrounding environment are low. 2. Use a support form that combines pile anchor support with retaining wall: There are greater safety risks during the construction of the retaining wall, the process is more complicated, the construction period is longer, the cost is higher, and the retaining wall must be temporarily sloped during the masonry process. The amount of earth excavation and backfilling is large, and it must occupy a larger space.
[0005] It can be seen from this that due to the limited support space, when carrying out support construction on the foundation pit side facing the soil, the existing construction methods have problems such as extended construction period, increased cost, and more processes. Utility Model Content
[0006] The utility model provides a combined enclosure structure of micro steel pipe piles and cast-in-place piles, which can avoid the problem of insufficient rigidity of steel pipe piles, reduce construction procedures, lower construction costs, and ensure safety at the same time.
[0007] The technical solution of the utility model to solve the above technical problems is as follows:
[0008] A combined enclosure structure of micro steel pipe piles and cast-in-place piles, comprising a vertically arranged steel cage, a steel pipe whose lower end extends into the upper end of the steel cage (1) and is fixed to the inner wall of the upper end of the steel cage, and a partition plate, wherein the partition plate is fixed to the top end of the steel cage, and one side of the partition plate is fixed to the side surface of the steel pipe.
[0009] The beneficial effects of the utility model are as follows: the steel cage and the steel pipe are connected into one body through the partition plate, which can be formed in one go during the bored pile construction, avoiding secondary construction on the top after the bored pile is formed, thereby reducing costs and improving efficiency; and the steel pipe pile itself is relatively short, which greatly avoids the problem of insufficient rigidity caused by incomplete grouting during construction, thereby avoiding the problem of insufficient rigidity of the steel pipe pile, reducing construction procedures, reducing construction costs, and ensuring safety at the same time.
[0010] On the basis of the above technical solution, the present invention can also be improved as follows.
[0011] Furthermore, a positioning rib is fixed to the top end of the steel pipe, and the length direction of the positioning rib extends along the radial direction of the steel pipe.
[0012] The beneficial effect of adopting the above further solution is that when constructing multiple retaining pile structures, the linearity of the multiple retaining pile structures can be ensured by using multiple positioning ribs located on the same straight line.
[0013] Furthermore, the positioning rib is parallel to the partition plate.
[0014] The beneficial effect of adopting the above further scheme is that during construction, the steel pipe is closer to the soil side of the supporting structure relative to the partition plate, and the side closer to the soil side is the pit side; through this arrangement, it is ensured that after the pile is formed, the steel pipes of each steel pipe pile remain neatly in a straight line and are all on the soil side of the foundation pit, ensuring the smooth construction of the top beam of the micro steel pipe pile while ensuring the bottom cast-in-place pile cap beam.
[0015] Furthermore, a lubricating layer is provided on the other side of the partition plate relative to the steel pipe (2).
[0016] The beneficial effect of adopting the above further scheme is that it can prevent the over-cast concrete of the bored pile from firmly adhering to the partition plate, thereby avoiding the unevenness of the partition plate due to the adhesion of concrete when the pile head is broken, which affects the size of the crown beam of the supporting pile.
[0017] Furthermore, the steel pipe is filled with gravel, and both ends of the steel pipe are closed ends.
[0018] The beneficial effects of adopting the above further solution are: using crushed stone to improve the structural strength of the steel pipe, and setting the upper end of the steel pipe as a closed end to prevent mud, debris, etc. from entering the steel pipe.
[0019] Furthermore, the lower end of the steel pipe is an inclined structure.
[0020] The beneficial effect of adopting the above further solution is to prevent the guide tube from getting stuck during the pouring of the bored pile.
[0021] Furthermore, the connection position between the steel pipe and the partition plate (3) is located in the middle of the partition plate.
[0022] The beneficial effect of adopting the above further scheme is: ensuring that after the pile is formed, the steel pipes of each steel pipe pile remain neatly in a straight line and are all on the soil side of the foundation pit, ensuring the smooth construction of the top beam of the micro steel pipe pile while ensuring the bottom cast-in-place pile cap beam.
[0023] Furthermore, the steel cage includes multiple main bars and multiple stirrups, the multiple main bars are vertically arranged and circumferentially spaced to form a circle, the multiple stirrups are spaced along the length direction of the main bars, and the stirrups simultaneously surround and are fixed to the multiple main bars, and the partition plate is fixed to the main bars.
[0024] The beneficial effect of adopting the above further solution is that a plurality of main bars are fixed to each other to form a steel cage.
[0025] Furthermore, the steel pipe is fixed to the main reinforcement and / or the stirrups.
[0026] The beneficial effect of adopting the above further solution is to ensure the structural strength between the steel pipe and the steel cage.
[0027] Furthermore, the main reinforcement fixed to the partition plate is located on the other side of the partition plate relative to the steel pipe.
[0028] The beneficial effect of adopting the above further scheme is that during construction, the other side of the partition plate relative to the steel pipe 2 is the pit side, and the above arrangement method is adopted to ensure the number of main bars anchored in the steel cage in the crown beam during the construction of the crown beam. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] Figure 1 It is a front view of the utility model;
[0030] Figure 2 It is a top view of the utility model.
[0031] In the accompanying drawings, the components represented by the reference numerals are listed as follows:
[0032] 1. Steel cage; 11. Main reinforcement; 12. Stirrups;
[0033] 2. Steel pipe;
[0034] 3. Separator;
[0035] 4. Positioning ribs. DETAILED DESCRIPTION
[0036] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.
[0037] Example 1
[0038] like Figure 1 and Figure 2 A combined enclosure structure of micro steel pipe piles and cast-in-place piles includes a vertically arranged steel cage 1, a steel pipe 2 whose lower end extends into the upper end of the steel cage 1 and is fixed to the inner wall of the upper end of the steel cage 1, and a partition plate 3, wherein the partition plate 3 is fixed to the top of the steel cage 1, and one side of the partition plate 3 is fixed to the side of the steel pipe 2.
[0039] The beneficial effects of this embodiment are as follows: the reinforcement cage 1 and the steel pipe 2 are connected into one body through the partition plate 3, which can be formed in one go during the construction of the bored pile, avoiding secondary construction on the top after the bored pile is formed, thereby reducing costs and improving efficiency; and the steel pipe pile itself is relatively short, which greatly avoids the problem of insufficient rigidity caused by incomplete grouting during construction, thereby avoiding the problem of insufficient rigidity of the steel pipe pile, reducing construction procedures, reducing construction costs, and ensuring safety at the same time.
[0040] As a specific solution of the above embodiment, the partition plate 3 is a steel plate, the plate surface direction of which extends along the radial direction of the steel pipe 2, and a steel plate with a thickness of 2 cm can be used.
[0041] Among them, the steel pipe 2 can be a steel pipe with an inner diameter of 150mm and a wall thickness of 4.5mm.
[0042] During the specific production, the steel pipe 2 is anchored into the steel cage 1 and welded to the steel cage 1, and a partition plate 3 with a thickness of 2 mm is welded on the top of the steel cage 1 to connect the steel cage 1, the steel pipe 2 and the partition plate 3 into one body.
[0043] During the specific installation, the steel cage 1 is hoisted in the pile hole, and the steel pipe 2 is located on the soil side of the steel cage 1 relative to the partition plate 3. Conversely, the partition plate 3 is located on the pit side relative to the steel pipe 2. After pouring, the steel cage 1 and the steel pipe 2 are connected to form a whole, and are formed at one time during the construction of the cast-in-place pile. After that, the crown beam construction can be carried out.
[0044] During the entire construction process, the micro steel pipe pile steel pipe 2 and the steel cage 1 are connected into a whole by welding. The micro steel pipe pile steel pipe 2 is integrated with the steel cage 1 and is consistent with the pile spacing to ensure a pile spacing distance.
[0045] Example 2
[0046] like Figure 1 and Figure 2On the basis of Example 1, a positioning rib 4 is fixed to the top end of the steel pipe 2, and the length direction of the positioning rib 4 extends along the radial direction of the steel pipe 2.
[0047] The beneficial effect of adopting the preferred solution in the above embodiment is that when constructing multiple retaining pile structures, the linearity of the multiple retaining pile structures can be ensured by using multiple positioning ribs 4 located on the same straight line.
[0048] In this embodiment, the positioning rib 4 can be made of steel bars and welded to the top end of the steel pipe 2 .
[0049] The measurement, positioning and layout of the supporting piles must be ensured to be more accurate on the basis of the allowable deviation range required by the design specifications. The verticality must be strictly controlled during the rotary drilling process. At the same time, when lowering the steel cage 1, the angle of the positioning rib 4 welded on the top of the steel pipe 2 is adjusted to make the positioning rib 4 on the top of the micro-steel pipe pile steel pipe 2 in the same plane position parallel to the center connecting line of the supporting pile, thereby ensuring that the partition plate 3 is in an aligned state to ensure the smooth installation and binding of the main reinforcement of the crown beam, and at the same time ensure that the construction size of the top crown beam of the micro-steel pipe pile steel pipe 2 meets the requirements of the design specifications.
[0050] Example 3
[0051] like Figure 1 and Figure 2 Based on embodiments 1 and 2, the positioning rib 4 is parallel to the partition plate 3.
[0052] The beneficial effect of adopting the preferred scheme in the above embodiment is that during construction, the steel pipe 2 is closer to the soil side of the supporting structure relative to the partition plate, and is closer to the pit side relative to the soil side; through this arrangement, it is ensured that after the pile is formed, the steel pipe 2 of each steel pipe pile remains neatly in a straight line and is all on the soil side of the foundation pit, ensuring the smooth construction of the top crown beam of the bottom cast-in-place pile while ensuring the smooth construction of the top crown beam of the micro steel pipe pile.
[0053] Example 4
[0054] like Figure 1 and Figure 2 On the basis of Embodiment 1-3, a lubricating layer is provided on the other side of the partition plate 3 relative to the steel pipe 2.
[0055] The beneficial effect of adopting the preferred solution in the above embodiment is that it can prevent the over-cast concrete of the bored pile from firmly adhering to the partition plate 3, thereby avoiding the unevenness of the partition plate 3 due to the adhesion of concrete when the pile head is broken, thereby avoiding the impact on the size of the supporting pile crown beam.
[0056] As a specific solution of the above embodiment, the lubricating layer can be made of lubricating oil or wrapped with transparent tape. Lubricating oil (or wrapped with transparent tape) is applied to the pit surface of the partition plate 3. This method can prevent the over-filled concrete of the cast-in-place pile from firmly adhering to the partition plate 3, thereby avoiding the unevenness of the steel plate due to the adhesion of concrete when the pile head is broken, which affects the size of the crown beam of the supporting pile.
[0057] Example 5
[0058] like Figure 1 and Figure 2 On the basis of Examples 1-4, the steel pipe 2 is filled with gravel, and both ends of the steel pipe 2 are closed ends.
[0059] The beneficial effect of adopting the preferred solution in the above embodiment is that crushed stone is used to improve the structural strength of the steel pipe 2, and the upper end of the steel pipe 2 is set as a closed end to prevent mud, slag, etc. from entering the steel pipe 2.
[0060] The crushed stone may have a particle size of 5-10 mm. When the upper end of the steel pipe 2 is sealed, cement slurry with a grade of PO 42.5 may be used for grouting and filling, and the cement slurry in the steel pipe 2 may be filled fully by multiple grouting to ensure the rigidity of the steel pipe 2 of the micro steel pipe pile.
[0061] Example 6
[0062] like Figure 1 and Figure 2 On the basis of Embodiment 1-5, the lower end of the steel pipe 2 is an inclined structure.
[0063] The beneficial effect of adopting the preferred solution in the above embodiment is to prevent the pipe from being stuck during the pouring of the bored pile. The inclined surface structure can be a 45° inclined surface, and is inclined toward the side of the partition plate 3 away from the steel pipe 2.
[0064] Example 7
[0065] like Figure 1 and Figure 2 Based on Examples 1-6, the connection position between the steel pipe 2 and the partition plate 3 is located in the middle of the partition plate 3.
[0066] The beneficial effect of adopting the preferred scheme in the above embodiment is to ensure that after the pile is formed, each steel pipe 2 of the steel pipe pile remains neatly in a straight line and is located on the soil side of the foundation pit, ensuring the smooth construction of the top beam of the micro steel pipe pile while ensuring the bottom cast-in-place pile cap beam.
[0067] Example 8
[0068] like Figure 1 and Figure 2On the basis of Examples 1-7, the steel cage 1 includes a plurality of main bars 11 and a plurality of stirrups 12, the plurality of main bars 11 are vertically arranged and circumferentially spaced to form a circle, the plurality of stirrups 12 are spaced along the length direction of the main bars 11, and the stirrups 12 simultaneously surround and are fixed to the plurality of main bars 11, and the partition plate 3 is fixed to the main bars 11.
[0069] The beneficial effect of adopting the preferred solution in the above embodiment is that a plurality of main bars 11 are fixed to each other to form a steel cage 1 .
[0070] Specifically, the stirrups 12 can be made of two kinds of round steel bars with different diameters, which are clamped on the main bars 11 and tied together by wires to form the steel cage 1.
[0071] Example 9
[0072] like Figure 1 and Figure 2 On the basis of Examples 1-8, the steel pipe 2 is fixed to the main reinforcement 11 and / or stirrups 12. Figure 2 In the figure, only the state where the steel pipe 2 is fixed to the stirrup 12 is shown.
[0073] The beneficial effect of adopting the preferred solution in the above embodiment is to ensure the structural strength between the steel pipe 2 and the steel cage 1.
[0074] Example 10
[0075] like Figure 1 and Figure 2 On the basis of Examples 1-9, the main reinforcement 11 fixed to the partition plate 3 is located on the other side of the partition plate 3 relative to the steel pipe 2.
[0076] The beneficial effect of adopting the preferred solution in the above embodiment is that during construction, the partition plate 3 is on the pit side relative to the other side of the steel pipe 2, and the above arrangement method is adopted to ensure the number of main bars 11 anchored in the steel cage 1 in the crown beam during the crown beam construction.
[0077] After the cement slurry in the steel pipe 2 of the micro steel pipe pile solidifies and reaches a certain strength, the steel pipe pile is excavated to construct the micro crown beam on the top of the micro steel pipe pile. After the micro crown beam reaches a certain strength, the micro steel pipe pile is excavated to the crown beam elevation of the cast-in-place pile. The area above the effective pile top elevation of the cast-in-place pile and below the bottom elevation of the micro crown beam is supported by soil nails (anchor rods), steel mesh and sprayed anchors.
[0078] When breaking the cast-in-place pile head, only the concrete on the side of the partition plate 3 facing the pit surface needs to be broken. During earth excavation, it is strictly forbidden to knock against the steel pipe 2 of the micro steel pipe pile to prevent damage to it and affect the rigidity of the steel pipe pile. After the cast-in-place pile head is broken, the cast-in-place pile crown beam is constructed.
[0079] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0080] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0081] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it 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 the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0082] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0083] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.
[0084] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.
Claims
1. A combined enclosure structure of micro steel pipe piles and cast-in-place piles, characterized in that: It comprises a vertically arranged steel cage (1), a steel pipe (2) whose lower end extends into the upper end of the steel cage (1) and is fixed to the inner wall of the upper end of the steel cage (1), and a partition plate (3), wherein the partition plate (3) is fixed to the top end of the steel cage (1), and one side of the partition plate (3) is fixed to the side surface of the steel pipe (2).
2. The micro steel pipe pile and cast-in-place pile combined enclosure structure according to claim 1, characterized in that: A positioning rib (4) is fixed to the top end of the steel pipe (2), and the length direction of the positioning rib (4) extends along the radial direction of the steel pipe (2).
3. The micro steel pipe pile and cast-in-place pile combined enclosure structure according to claim 2, characterized in that: The positioning rib (4) is parallel to the partition plate (3).
4. The micro steel pipe pile and cast-in-place pile combined enclosure structure according to claim 1, characterized in that: A lubricating layer is provided on the other side of the partition plate (3) relative to the steel pipe (2).
5. The micro steel pipe pile and cast-in-place pile combined enclosure structure according to claim 1, characterized in that: The steel pipe (2) is filled with crushed stones, and both ends of the steel pipe (2) are closed ends.
6. The micro steel pipe pile and cast-in-place pile combined enclosure structure according to claim 1, characterized in that: The lower end of the steel pipe (2) is an inclined structure.
7. The micro steel pipe pile and cast-in-place pile combined enclosure structure according to claim 1, characterized in that: The connection position between the steel pipe (2) and the partition plate (3) is located in the middle of the partition plate (3).
8. The micro steel pipe pile and cast-in-place pile combined enclosure structure according to claim 1, characterized in that: The steel cage (1) comprises a plurality of main bars (11) and a plurality of stirrups (12); the plurality of main bars (11) are arranged vertically and are circumferentially spaced to form a circle; the plurality of stirrups (12) are spaced along the length direction of the main bars (11); and the stirrups (12) simultaneously surround and are fixed to the plurality of main bars (11); and the partition plate (3) is fixed to the main bars (11).
9. A micro steel pipe pile and cast-in-place pile combined enclosure structure according to claim 8, characterized in that: The steel pipe (2) is fixed to the main reinforcement (11) and / or the stirrup (12).
10. A micro steel pipe pile and cast-in-place pile combined enclosure structure according to claim 8, characterized in that: The main rib (11) fixed to the partition plate (3) is located on the other side of the partition plate (3) relative to the steel pipe (2).