Double-row pile enclosure structure and construction method thereof
Through the double-row pile enclosure structure and its construction method, combined with the anchor cable system and waist beam support, the construction difficulty and interference problems of traditional foundation pit support technology under depth and complex geological conditions are solved, and internal support is achieved without setting up Provides stability and high waterproof performance in the case of strict space and high waterproofing requirements, suitable for underground projects.
Patent Information
- Application Number
- CN202411118685.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-15
- Publication Date
- 2024-12-06
AI Technical Summary
Traditional foundation pit support technology requires a lot of internal support when facing large depths and complex geological conditions, which affects the construction progress and increases construction difficulty and risks. Especially in areas with limited space or dense underground pipelines, construction interference is greater.
The double-row pile enclosure structure and its construction method are adopted. Through the combination of front and rear piles, the anchor cable system and waist beam support is combined to form a cantilever enclosure structure, reducing internal support and improving waterproof performance, suitable for strict spaces Required underground engineering.
Provide sufficient stability without setting up internal support, reduce construction interference, shorten construction period, significantly improve waterproof performance, and is suitable for engineering with high waterproofing requirements and complex underground environments.
Smart Images
Figure CN119083447A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of foundation pit retaining, in particular to a double-row pile retaining structure and a construction method thereof. Background Art
[0002] Under the background of the rapid development of underground space engineering, the scale of foundation pit engineering is constantly expanding. In order to ensure the safety and stability of construction, the design and implementation of support structures are particularly important. Although traditional foundation pit support technologies such as pile rows, soil nail walls and underground continuous walls can meet the engineering needs to a certain extent, these traditional methods also have some shortcomings as the depth of the foundation pit increases and the complexity of the surrounding environment increases.
[0003] In the existing technology, common foundation pit support methods include pile row, soil nail wall, anchor support, etc. These methods often require a large number of internal support structures when facing large foundation pit depths and complex geological conditions, affecting the construction progress and the use of underground space. Especially in areas with limited space or dense underground pipelines, traditional support methods are prone to cause construction interference, increasing construction difficulty and risk. Summary of the invention
[0004] In order to solve the above problems, the present invention provides a double-row pile enclosure structure and a construction method thereof. The technology provides sufficient stability without setting internal support by combining the front row and the rear row of piles, cooperating with the anchor cable system and the waist beam support. The method is particularly suitable for underground projects with strict requirements on internal space, and can effectively reduce construction interference and shorten the construction period. At the same time, by optimizing the configuration of steel sheet piles and steel pipe piles, the double-row pile enclosure structure can also significantly improve the waterproof performance and meet the engineering needs with high waterproof requirements.
[0005] In order to achieve the above object, the technical solution of the present invention is as follows:
[0006] A double-row pile enclosure structure comprises a front row of steel pipe piles, a front row of steel sheet piles, a front row of pile waist beams, a front row of waist beam supporting corbels, anchor cables, a front row of anchor heads, a rear row of anchor heads, a rear row of steel sheet piles, a rear row of steel pipe piles, a rear row of pile waist beams, and a plain concrete force transmission belt, wherein a front row of steel pipe piles are arranged between the front row of steel sheet piles, the front row of steel sheet piles are connected to the rear row of piles by anchor cables, the two ends of the anchor cables are respectively fixed to the outside of the front row of pile waist beams and the rear row of pile waist beams by the front row of anchor heads and the rear row of anchor heads, the front row of pile waist beams are supported and fixed by the front row of waist beam supporting corbels, and the whole forms a cantilever enclosure structure.
[0007] Furthermore, the rear row of piles can be steel sheet piles or steel pipe piles according to engineering requirements.
[0008] Furthermore, the spacing between the front row of steel sheet piles and the rear row of steel sheet piles is greater than or equal to one times the excavation depth of the foundation pit.
[0009] Furthermore, the front row of steel pipe piles and the front row of steel sheet piles are constructed on the same vertical plane, and the two are connected by the tongue and groove of the steel pipe piles.
[0010] Furthermore, a plain concrete force transfer belt is arranged between the front row of steel sheet piles and the proposed structure to support the front row of steel sheet piles; pit bottom reinforcement is constructed below the plain concrete force transfer belt and the proposed structure.
[0011] Furthermore, the anchor cable structure may be made of prestressed steel strands or steel bars; the front row and rear row steel sheet piles may be made of hot-rolled U-shaped steel sheet piles, which are driven in with a small lock.
[0012] Furthermore, the rear row of steel sheet piles are arranged continuously or multiple groups of rear row steel sheet piles are arranged at intervals; preferably, the rear row of steel sheet piles can be constructed in a continuous manner or in a manner of two groups of steel sheet piles, three groups of steel sheet piles, or four groups of steel sheet piles at equal intervals. The rear row of steel pipe piles are arranged at equal intervals. A single group or several groups of front row steel sheet piles are arranged between the rows of steel pipe piles, and the front row of steel sheet piles and the front row of steel pipe piles can be constructed in a manner of one group of steel pipe piles separated by one group of steel sheet piles, or one group of steel pipe piles separated by two groups (or multiple groups) of steel sheet piles.
[0013] Correspondingly, the present solution also provides a double-row pile retaining structure construction method, which is used to construct the above-mentioned double-row pile retaining structure, comprising the following steps:
[0014] S 1 : Use piling machinery to put the front row steel pipe piles, front row steel sheet piles and rear row steel sheet piles in place;
[0015] S 2 : At the bottom of the foundation pit, a pit bottom reinforcement of a certain depth and width is constructed in front of the front row of steel pipe piles and the front row of steel sheet piles; the pit bottom reinforcement can be achieved by using cement-soil mixing piles, high-pressure rotary jet piles, and compaction grouting.
[0016] S 3 : Set up the front row pile waist beam and the rear row pile waist beam at the corresponding positions of the front row steel sheet piles and the rear row steel sheet piles;
[0017] S 4 : A front row waist beam support corbel is arranged under the front row pile waist beam for fixing;
[0018] S 5 : Set up anchor cables and fix the front row anchor heads;
[0019] S 6 : The anchor cable is prestressed and fixed with the rear row anchor head;
[0020] S 7 : Carry out foundation pit excavation construction, and construct the internal main structure after the foundation pit is excavated to the bottom. When constructing the internal main structure, a plain concrete force transfer belt can be constructed.
[0021] Furthermore, after the construction of the front and rear steel sheet piles is completed, C 20 The gap between the steel sheet piles and the waist beam is filled with early-strength fine stone concrete, and the filling height is the same as the waist beam of the front row of piles and the waist beam of the rear row of piles.
[0022] Furthermore, the anchor cable may pass through the front row of steel sheet piles and the rear row of steel sheet piles by drilling holes in the front row of steel sheet piles and the rear row of steel sheet piles or by lowering the height of the steel sheet piles at the corresponding crossing position.
[0023] The present invention has the following beneficial effects:
[0024] In this scheme, the enclosure structure formed by the front row of steel sheet piles and the front row of steel pipe piles is supported by the front row of pile waist beams and the front row of waist beam supporting corbels, and the rear row of piles is connected to the front row of pile waist beams and the rear row of pile waist beams through anchor cables. This structural form can provide sufficient stability without setting up internal supports, and is particularly suitable for underground projects with strict requirements on internal space. The steel sheet piles and steel pipe piles in the double-row pile structure can effectively prevent the penetration of groundwater. By adopting materials and construction processes with good waterproof performance (such as plain concrete force transfer belts), it can ensure that the structure has good waterproof properties and meet the needs of projects with high waterproof requirements.
[0025] The anchor cable system used in this solution can be flexibly adjusted, and the layout of the anchor cables does not require too much space, which is particularly suitable for places with many surrounding pipelines. Traditional anchor rod construction may conflict with or interfere with surrounding pipelines, but the anchor cable system in this solution solves this problem by connecting the front and rear row pile waist beams. The rear row piles can be selected from steel sheet piles or steel pipe piles according to actual needs, and the spacing between the front and rear row steel sheet piles can be adjusted, providing a flexible construction solution that helps avoid complex underground pipelines and facilities.
[0026] The double-row pile enclosure structure of the present invention is convenient to construct and does not require maintenance, which can greatly reduce the construction period; it has the advantages of reliable water stopping, green and recyclable, and does not require the installation of internal supports and anchor rods, which will not affect the construction of internal structures and surrounding pipelines. The enclosure structure of the present invention is suitable for underground structures with high waterproof requirements where it is inconvenient to install internal supports and for water supply and drainage station foundation pit enclosure projects with many surrounding pipelines where it is inconvenient to install anchor rods. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Figure 1 is a cross-sectional view of the enclosure structure of Example 1 of the present invention;
[0028] Figure 2 It is a plan view of the enclosure structure of Example 1 of the present invention;
[0029] Figure 3 A three-dimensional diagram of the enclosure structure of Example 1 of the present invention;
[0030] Figure 4 It is a cross-sectional view of the enclosure structure of Example 2, Example 3 and Example 4 of the present invention;
[0031] Figure 5 It is a plan view of the enclosure structure of Example 2 of the present invention;
[0032] Figure 6 A three-dimensional diagram of the enclosure structure of Example 2 of the present invention;
[0033] Figure 7 It is a plan view of the enclosure structure of Example 3 of the present invention;
[0034] Figure 8 A three-dimensional diagram of the enclosure structure of Example 3 of the present invention;
[0035] Fig. 9 It is a plan view of the enclosure structure of Example 4 of the present invention;
[0036] Fig.10 A three-dimensional diagram of the enclosure structure of Example 4 of the present invention;
[0037] Fig.11 This is a structural diagram of a steel pipe pile of the present invention;
[0038] Fig.12 This is the rear row steel sheet pile anchoring diagram of the present invention;
[0039] Fig.13 This is the anchoring diagram of the front row of steel sheet piles of the present invention.
[0040] Numbers in the figure:
[0041] 1. Front row steel pipe piles; 2. Rear row steel sheet piles; 3. Anchor cables; 4. Front row pile waist beams; 5. Rear row pile waist beams; 6. Front row anchor heads; 7. Rear row anchor heads; 8. Plain concrete force transfer belts; 9. Pit bottom reinforcement; 10. Planned structure; 11. Front row steel sheet piles; 12. Front row waist beam support corbels; 13. Steel pipe pile tongue and groove; 14. Rear row steel pipe piles. DETAILED DESCRIPTION
[0042] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description and claims. It should be noted that the drawings are all in very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.
[0043] Example 1
[0044] Please refer to Figure 1 , Figure 2-3 , Figure 11 to Figure 13The present embodiment discloses a double-row pile enclosure structure and a construction method thereof, including a front row steel pipe pile 1, an anchor cable 3, a front row pile waist beam 4, a rear row pile waist beam 5, a front row anchor head 6, a rear row anchor head 7, a plain concrete force transmission belt 8, a front row steel sheet pile 11, a rear row steel pipe pile 14, and a front row waist beam supporting corbel 12.
[0045] A pile driving machine is used to construct the front row steel pipe piles 1, the front row steel sheet piles 11, and the rear row steel pipe piles 14 in place; a pit bottom reinforcement 9 of a certain depth and width is constructed at the bottom of the foundation pit, in front of the front row steel pipe piles 1 and the front row steel sheet piles 11; a front row pile waist beam 4 and a rear row pile waist beam 5 are erected at the corresponding positions of the front row steel sheet piles 11 and the rear row steel pipe piles 14; the front row pile waist beam 4 is fixed with a front row waist beam supporting corbel 12; an anchor cable 3 is erected and fixed with a front row anchor head 6; a prestressed anchor cable 3 is applied and fixed with a rear row anchor head 7 to form a cantilever retaining structure; foundation pit excavation construction is carried out, and an internal main structure 10 is constructed after the foundation pit is excavated to the bottom, and a plain concrete force transfer belt 8 can be constructed during the construction of the internal main structure 10.
[0046] Furthermore, the front row of steel pipe piles 1 and the front row of steel sheet piles 11 are installed alternately at intervals, and the front row of steel pipe piles 1 and the front row of steel sheet piles 11 are connected by a steel pipe pile tongue and groove.
[0047] Furthermore, the distance between the front row of steel pipe piles 1 and the front row of steel sheet piles 11 and the rear row of steel pipe piles 14 is greater than or equal to one time of the foundation pit excavation depth.
[0048] Furthermore, a plain concrete force transmission belt 8 may be provided between the front row of steel pipe piles 1 and the front row of steel sheet piles 11 and the proposed structure 10 to support the front row of steel sheet piles.
[0049] Furthermore, the anchor cable 3 should be prestressed when connected, and the bare soil should be backfilled after the front pile waist beam 4, the rear pile waist beam 5, the front anchor head 6, and the rear anchor head 7 are fixed at both ends.
[0050] Furthermore, the anchor cable 3 structure may be made of prestressed steel strands or steel bars.
[0051] Furthermore, the front row of steel sheet piles 11 are hot-rolled U-shaped steel sheet piles, which are driven in with a small lock.
[0052] Further, after the construction of the front row steel sheet piles 11 and the rear row steel pipe piles 14 is completed, C 20 The gap between the steel sheet piles and the waist beam is filled with early-strength fine stone concrete, and the filling height is the same as the front row pile waist beam 4 and the rear row steel pipe pile waist beam 5.
[0053] Furthermore, the anchor cable 3 passes through the front row steel sheet piles 11 and the rear row pipe sheet piles 14, which can be achieved by drilling holes in the front row steel sheet piles 11 or lowering the height of the steel sheet piles at the corresponding passing position.
[0054] Furthermore, the rear row of steel pipe piles 2 are constructed at equal intervals.
[0055] Furthermore, according to the soil conditions and the requirements for controlling the deformation of the foundation pit, a pit bottom reinforcement 9 of a certain depth and width can be constructed at the bottom of the foundation pit, in front of the front row of steel pipe piles 1 and the front row of steel sheet piles 11. The pit bottom reinforcement 9 can be made of cement soil mixing piles, high-pressure rotary jet piles, and compaction grouting.
[0056] The construction method of this embodiment includes the following but not limited to the following steps: using a pile driving machine to construct the front row steel pipe piles 1, the front row steel sheet piles 11, and the rear row steel pipe piles 2 in place; constructing a pit bottom reinforcement 9 of a certain depth and width in front of the foundation pit bottom, the front row steel pipe piles 1, and the front row steel sheet piles 11; erecting the front row pile waist beams 4 and the rear row pile waist beams 5 at the corresponding positions of the front row steel sheet piles 11 and the rear row steel pipe piles 2, and the front row pile waist beams 4 are fixed with the front row waist beam support corbels 12; erecting the anchor cable 3, and fixing the front row anchor head 6; applying prestress to the anchor cable 3, and fixing it with the rear row anchor head 7 to form a cantilever retaining structure; carrying out foundation pit excavation construction, and constructing the internal main structure 10 after the foundation pit is excavated to the bottom, and a plain concrete force transmission belt 8 can be constructed during the construction of the internal main structure 10.
[0057] Example 2
[0058] See also Figures 4 to 6 , Figure 11 to Figure 13 , the rear row of steel sheet piles 2 adopts a continuous construction method. The anchor cable 3 passes through the front row of steel sheet piles 11 and the rear row of steel sheet piles 2, which can be achieved by drilling holes in the front row of steel sheet piles 11 and the rear row of steel sheet piles 2 or lowering the height of the steel sheet piles at the corresponding crossing position. The rest is the same as in Example 1.
[0059] Example 3
[0060] See also Figure 4 , Figure 6 , Figure 8 , Figure 11 to Figure 13 The front row construction adopts a group of steel pipe piles 1 and two groups of steel sheet piles 11. The rest is the same as in Example 2.
[0061] Example 4
[0062] See also Figure 4 , Fig. 9 , Fig.10 , Figure 11 to Figure 13 Furthermore, the rear row of steel sheet piles 2 is constructed in a manner of three groups of steel sheet piles at intervals. The rest is the same as in Example 2.
Claims
1. A double-row pile enclosure structure, characterized in that: The utility model comprises a front row steel pipe pile (1), a front row steel sheet pile (11), a front row pile waist beam (4), a front row waist beam supporting corbel (12), an anchor cable (3), a front row anchor head (6), a rear row anchor head (7), a rear row steel sheet pile (2), a rear row steel pipe pile (14), a rear row pile waist beam (5), and a plain concrete force transmission belt (8), characterized in that a front row steel pipe pile (1) is arranged between the front row steel sheet piles (11), the front row steel sheet piles (11) and the rear row piles are connected by an anchor cable (3), the two ends of the anchor cable (3) are respectively fixed to the outside of the front row pile waist beam (4) and the rear row pile waist beam (5) by the front row anchor head (6) and the rear row anchor head (7), the front row pile waist beam (4) is supported and fixed by the front row waist beam supporting corbel (12), and the whole forms a cantilever type enclosure structure.
2. The double-row pile enclosure structure according to claim 1 is characterized in that: The rear row of piles can be steel sheet piles (2) or steel pipe piles (14) according to engineering requirements.
3. The double-row pile enclosure structure according to claim 2 is characterized in that: The distance between the front row of steel sheet piles (11) and the rear row of steel sheet piles (2) is greater than or equal to one times the excavation depth of the foundation pit.
4. The double-row pile enclosure structure according to claim 1 is characterized in that: The front row of steel pipe piles (1) and the front row of steel sheet piles (11) are constructed on the same vertical plane, and the two are connected by a steel pipe pile tongue and groove (13).
5. The double-row pile enclosure structure according to claim 1 is characterized in that: A plain concrete force transmission belt (8) is arranged between the front row of steel sheet piles (11) and the proposed structure (10) to support the front row of steel sheet piles (11); and a pit bottom reinforcement (9) is constructed below the plain concrete force transmission belt (8) and the proposed structure (10).
6. The double-row pile enclosure structure according to claim 1, characterized in that: The anchor cable (3) structure may be made of prestressed steel strands or steel bars; the front row steel sheet piles (11) and the rear row steel sheet piles (2) are made of hot-rolled U-shaped steel sheet piles, which are driven in with a small lock.
7. The double-row pile enclosure structure according to claim 1 is characterized in that: The rear row steel sheet piles (2) are arranged continuously or multiple groups of rear row steel sheet piles (2) are arranged at intervals; the rear row steel pipe piles (14) are arranged at equal intervals; and a single group or multiple groups of front row steel sheet piles (11) are arranged between the rows of steel pipe piles (1).
8. A method for constructing a double-row pile retaining structure, used for constructing a double-row pile retaining structure as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: S1: Use a pile driving machine to construct the front row steel pipe piles (1), the front row steel sheet piles (11), and the rear row steel sheet piles (2) in place; S2: At the bottom of the foundation pit, a pit bottom reinforcement (9) of a certain depth and width is constructed before the front row of steel pipe piles (1) and the front row of steel sheet piles (11); the pit bottom reinforcement (9) can be made of cement soil mixing piles, high pressure jet grouting piles, or compaction grouting. S3: erecting a front row pile waist beam (4) and a rear row pile waist beam (5) at corresponding positions of the front row steel sheet piles (11) and the rear row steel sheet piles (2); S4: A front row waist beam support bracket (12) is arranged below the front row pile waist beam (4) for fixing; S5: erecting anchor cables (3) and fixing the front row anchor heads (6); S6: The anchor cable (3) is prestressed and fixed with the rear row anchor head (7); S7: Excavation of the foundation pit is carried out, and after the foundation pit is excavated to the bottom, the internal main structure (10) is constructed. During the construction of the internal main structure (10), a plain concrete force transmission belt (8) may be constructed.
9. The double-row pile enclosure structure construction method according to claim 8, characterized in that: After the construction of the front row steel sheet piles (11) and the rear row steel sheet piles (2) is completed, the gap between the steel sheet piles and the waist beams shall be filled with C20 early strength fine stone concrete, and the filling height shall be the same as that of the front row pile waist beams (4) and the rear row pile waist beams (5).
10. The double-row pile enclosure structure construction method according to claim 8, characterized in that: The anchor cable (3) passes through the front row of steel sheet piles (11) and the rear row of steel sheet piles (2), which can be achieved by drilling holes in the front row of steel sheet piles (11) and the rear row of steel sheet piles (2) or lowering the height of the steel sheet piles at the corresponding crossing position.