Base composite structure, internal supporting structure and foundation pit support system
By adopting the base composite structure and elastomeric structure in the foundation pit enclosure system, and using existing engineering piles to jointly withstand soil pressure, the problem of insufficient economics of the existing foundation pit enclosure system is solved, and the project cost and material waste are reduced effect.
Patent Information
- Application Number
- CN202420778040.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-16
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-04-16
AI Technical Summary
The existing foundation pit enclosure system has great economic shortcomings, resulting in high project cost and high material waste, which affects the economic effect of construction.
The base composite structure is adopted, including the existing engineering piles, the first and second elastomeric structures between the enclosure piles and the engineering piles, and the skirt reinforcement structure to form a foundation pit enclosure system that works in concert.
By using existing engineering piles to jointly withstand soil pressure, the safety and stability of the foundation pit enclosure system will be improved, the use of materials and engineering costs will be reduced, and the requirements of green construction and building protection will be met.
Smart Images
Figure CN222456114U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of building foundation pit enclosure construction, in particular to a base composite structure, an internal supporting structure and a foundation pit enclosure system. Background Art
[0002] Foundation pit support plays the role of retaining soil, stabilizing the pit bottom and intercepting water in engineering construction, ensuring the safety of the surrounding environment and the safety of engineering construction. At present, there are various forms of deep foundation pit support, and the applicability and economy of different support systems are different. The selection of a reasonable support system requires comprehensive consideration based on engineering geological conditions and economy. Conventional foundation pit support systems are usually designed separately. Such support system designs have high redundancy in safety and stability, but in order to ensure design performance, more materials are consumed, which increases the engineering cost of the foundation pit support project, resulting in poor economic results.
[0003] In view of the disadvantages of poor economic effect of the foundation pit retaining system in the prior art, technical personnel in this field have been looking for solutions. Utility Model Content
[0004] The utility model aims to provide a base composite structure, an internal supporting structure and a foundation pit retaining system to solve the problem of poor economic effect of using the existing foundation pit retaining system.
[0005] In order to solve the above technical problems, the utility model provides a base composite structure, which includes: existing engineering piles of a foundation pit, a first elastomeric structure arranged between the retaining piles of the foundation pit and adjacent existing engineering piles, and a second elastomeric structure arranged between two adjacent existing engineering piles.
[0006] Optionally, the base composite structure further includes a skirt reinforcement structure, which is arranged between the retaining pile and the first elastomeric structure to bond the retaining pile to the first elastomeric structure.
[0007] The utility model also provides an internal support structure, which comprises: a bottom support structure and an upper support structure located above the bottom support structure, and the bottom support structure is the base composite structure as described above.
[0008] Optionally, in the internal supporting structure, the upper supporting structure is a concrete support.
[0009] The utility model also provides a foundation pit retaining system, which comprises: an external retaining structure and the internal supporting structure as described above which is arranged inside the external retaining structure.
[0010] Optionally, in the foundation pit retaining system, the external retaining structure is retaining piles.
[0011] In the base composite structure, internal support structure, and foundation pit retaining system provided by the utility model, the base composite structure includes: existing engineering piles of the foundation pit, a first elastic body structure arranged between the retaining piles of the foundation pit and adjacent existing engineering piles, and a second elastic body structure arranged between two adjacent existing engineering piles. The base composite structure of the utility model can meet the safety and stability of the foundation pit retaining system during the foundation pit construction process by utilizing the existing engineering piles to jointly bear the active earth pressure, and correspondingly reduces the engineering cost of the foundation pit retaining project, reduces the waste of materials, and meets the requirements of green construction and building protection.
[0012] On the other hand, when constructing the foundation pit maintenance system, before excavating the foundation pit, the existing engineering piles are used to form a base composite structure as the bottom support structure of the base to provide lateral support for the base, effectively improving the anti-overturning capacity of the foundation pit retaining system, while also improving the bearing capacity of the foundation and the ability to resist uneven settlement. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] The above and other objects, features and advantages of the present disclosure will become more apparent through a more detailed description of exemplary embodiments of the present disclosure in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present disclosure.
[0014] Figure 1 is a cross-sectional schematic diagram of a base composite structure in one embodiment of the utility model;
[0015] Figure 2 It is a cross-sectional schematic diagram of a first elastic structure formed between a retaining pile and an adjacent existing engineering pile in one embodiment of the utility model;
[0016] Figure 3 is Figure 2 A schematic cross-sectional view of a skirt reinforcement structure formed between the retaining pile and the first elastic body structure;
[0017] Figure 4 It is a cross-sectional schematic diagram of the reinforcement of the soil reinforcement portion between the retaining pile and the adjacent existing engineering pile in one embodiment of the utility model;
[0018] Figure 5 It is a schematic diagram of the plan view when the soil between the retaining piles and the adjacent existing engineering piles is reinforced by double-tube high-pressure rotary jet grouting reinforcement method;
[0019] Figure 6 It is a schematic diagram of the plan view when the soil between the retaining piles and the adjacent existing engineering piles is reinforced by using the double-tube directional swing jet grouting reinforcement method;
[0020] Figure 7 It is a plane diagram of the construction of the base composite structure by using the strip reinforcement method when the existing engineering pile group is evenly distributed;
[0021] Figure 8 It is a schematic diagram of the plane when the existing engineering pile group is arranged in a plum blossom shape and the base composite structure is constructed by the strip reinforcement method;
[0022] Fig. 9 It is a cross-sectional diagram of the soil between piles when sandwich composite reinforcement is used;
[0023] Fig.10 It is a cross-sectional schematic diagram of the existing engineering pile when the pile top is expanded and grouting is performed for reinforcement;
[0024] Fig.11 It is a flow chart of the construction method of the foundation pit retaining system in one embodiment of the utility model.
[0025] In the figure:
[0026] 1-first elastic body structure; 2-existing engineering pile; 3-second elastic body structure; 4-skirt reinforcement structure; 5-guard pile; 61-double-tube high-pressure rotary jet grouting; 62-double-tube directional swing jet grouting; 11-upper soil reinforcement; 12-middle soil reinforcement; 13-lower soil reinforcement; 21-pile top hole expansion grouting. DETAILED DESCRIPTION
[0027] The following is a further detailed description of the base composite structure, internal support structure, and foundation pit enclosure system proposed by the utility model in combination with the accompanying drawings and specific embodiments. The advantages and features of the utility model will become clearer according to the following description and claims. It should be noted that the drawings are all in a 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 utility model.
[0028] Please refer to Figure 1 , which is a cross-sectional schematic diagram of a substrate composite structure in one embodiment of this embodiment. Figure 1 As shown, the base composite structure includes: an existing engineering pile 2 of a foundation pit, a first elastic structure 1 arranged between a retaining pile 5 of the foundation pit and an adjacent existing engineering pile 2, and a second elastic structure 3 arranged between two adjacent existing engineering piles 2.
[0029] Specifically, when constructing the base composite structure, it is necessary to use grouting reinforcement between the piles (referring to: between the retaining pile 5 and the adjacent existing engineering pile 2, and between two adjacent existing engineering piles 2) before excavating the foundation pit, increase the grouting parameters, strengthen the soil between the piles, and form an elastic structure with a certain strength (i.e., the first elastic structure 1 and the second elastic structure 3). The elastic structure has a better bite effect with the engineering piles and can better transfer the soil pressure to the engineering piles. The existing engineering piles 2 are bored and cast-in-place piles with higher lateral bending and shear resistance. In other words, through the elastic structure formed between the piles, the existing engineering piles 2 and the retaining piles 5 can be synergistically stressed and jointly exert the synergistic working performance of the two components, so that when the base composite structure is used as the bottom support structure of the foundation pit, the anti-overturning ability, anti-slip ability and anti-uplift ability of the retaining system during the foundation pit excavation process can be effectively improved.
[0030] Please refer to Figure 2 and Figure 3 The base composite structure also includes: a skirt reinforcement structure 4, which is arranged between the retaining pile 5 and the first elastomer structure 1 to bond the retaining pile 5 to the first elastomer structure 1.
[0031] In another embodiment, the utility model further provides an internal support structure, which includes: a bottom support structure and an upper support structure located above the bottom support structure, wherein the bottom support structure is the base composite structure in the above embodiment; and the upper support structure is a concrete support.
[0032] In another embodiment, the utility model further provides a foundation pit retaining system, the foundation pit retaining system comprising: an external retaining structure and an internal support structure as described in the above embodiment arranged on the inner side of the external retaining structure. That is: the internal support structure used in the foundation pit retaining system is divided into an upper part and a bottom part, the upper part is a conventional reinforced concrete support, which mainly provides axial force and improves the stability of the retaining system; the bottom is a bottom support structure (i.e., a base composite structure) to form an effective force transmission path to transfer the soil pressure to the engineering piles 2. Based on the high strength of the base composite structure, the anti-overturning ability of the retaining system can be further improved, ensuring the stability and safety during the foundation pit excavation process. It is further explained that when the engineering geology is poor or the additional load in the active earth pressure zone is large, it is necessary to further strengthen the retaining system of the utility model and increase the thickness of the first elastic structure 1 and the skirt reinforcement 4. The purpose is to increase the cross-sectional area of the first elastic structure 1 to improve the bearing capacity. Specifically, Figure 4 shown.
[0033] In this embodiment, the external retaining structure is preferably retaining piles.
[0034] It can be understood that the above examples are merely examples listed for a better understanding of the technical solutions of the embodiments of the present application, and are not intended to be the sole limitation to the embodiments.
[0035] Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.
[0036] Accordingly, this embodiment also provides a construction method for a foundation pit retaining system. Figures 1 to 10 and Fig.11 The construction method of the foundation pit retaining system described in this embodiment is described in detail.
[0037] First, step S1 is performed. Before excavating the foundation pit, the soil at the bottom between the external retaining structure and the adjacent existing engineering piles 2 is constructed to form a first elastic body structure 1. Specifically, the soil between the external retaining structure and the adjacent existing engineering piles 2 is reinforced by a sampling reinforcement method to form the first elastic body structure 1.
[0038] Next, execute step S2, and perform skirt reinforcement construction along the four sides of the foundation pit in close contact with the external retaining structure to form a skirt reinforcement structure 4 between the external retaining structure and the first elastomeric structure 1. Specifically, the grouting method for the skirt reinforcement construction is: high-pressure rotary jet grouting method. The soil is hardened by grouting, and the hardening thickness is greater than the soil reinforcement between the piles. Its purpose (i.e., the role of the skirt reinforcement structure 4) is to strengthen the bonding effect between the external retaining structure and the first elastomeric structure, and at the same time form an effective force transmission path.
[0039] Next, step S3 is executed to construct the soil at the bottom between two adjacent existing engineering piles 2 to form a second elastomeric structure 3. The first elastomeric structure 1 and the second elastomeric structure 3 together constitute the bottom lateral support inside the external enclosure structure.
[0040] The soil at the bottom between two adjacent existing engineering piles 2 is reinforced by sampling reinforcement to form a second elastic body structure 3 .
[0041] Please refer to Figure 5 and Figure 6, soil reinforcement between piles (referring to the space between the external enclosure structure 5 and the existing engineering piles 2, and between the existing engineering piles 2 and the existing engineering piles 2) (i.e., referring to the construction of the first elastic body structure 1 and the second elastic body structure 3) is obtained by sampling reinforcement, and the specific reinforcement construction grouting method is: using double-tube high-pressure rotary jet grouting 61 or double-tube directional swing jet grouting 62. Among them, the advantage of double-tube high-pressure rotary jet grouting 61 is that the cement slurry penetrates into the soil along the grouting pipe to the surrounding area, the penetration area is large, the reinforcement speed is faster, and a better bite can be formed with the engineering pile 2. The advantage of directional swing jet grouting is that the cement slurry penetration area is controlled so that the cement slurry can be fully utilized without causing waste of materials, and it can also form an effective bite with the existing engineering pile 2. Further explanation, the grouting method of the utility model includes but is not limited to the two methods of double-tube high-pressure rotary jet grouting 61 and double-tube directional swing jet grouting 62. The specific grouting method needs to be selected according to the engineering requirements and engineering geological conditions. Preferably, the reinforcement form of the soil between piles is high-pressure rotary jet grouting reinforcement or biaxial cement mixing reinforcement. It should be further explained that the grouting parameters during the reinforcement construction are 1.2 times that of conventional high-pressure rotary jet reinforcement. The purpose of such setting is to further increase the cohesion and internal friction angle of the soil between piles, form the first elastic body structure 1 and the second elastic body structure 3 that can resist large loads, and have stronger bearing performance compared with conventional reinforcement.
[0042] Please refer to Figure 7 In this embodiment, the first elastomer structure 1 and the second elastomer structure 3 in the construction base composite structure adopt a symmetrical strip-type soil reinforcement. The symmetrical strip-type soil reinforcement is more suitable for projects with uniform and dense pile groups, and can give full play to the bearing capacity of the pile group. Compared with the traditional full-span reinforcement form, the advantage of this reinforcement method is that the project volume is small, the project cost is greatly reduced, the structural advantages are fully utilized, the waste of materials is avoided, the construction period can be shortened, and the requirements of green construction are met.
[0043] Please refer to Figure 8 When the existing engineering pile groups are arranged in a plum blossom shape, they can be reinforced by symmetrically pulling out bars at oblique angles to enhance the anti-deformation capacity of the corners of the foundation pit and further ensure the safety during the foundation pit excavation process.
[0044] Please refer to Fig. 9 In this embodiment, the soil reinforcement method of the first elastomer structure 1 and the second elastomer structure 3 in the construction base composite structure can also adopt a sandwich composite reinforcement method, that is, three-layer reinforcement, namely upper soil reinforcement 11, middle soil reinforcement 12 and lower soil reinforcement 13, wherein the upper and lower cement grouting parameters and thickness are the same, and the reinforcement thickness range is 0.5m to 1m; the grouting parameters of the middle area are lower than those of the upper and middle areas, but the reinforcement thickness is greater than that of the upper and lower areas.
[0045] Please refer to Fig.10 During the construction of the base composite structure, the top of the existing engineering pile can be expanded (i.e. Fig.10 The purpose of the middle pile top hole expansion grouting 21) is to increase the cross-sectional size of the top of the existing engineering pile 2 after the soil is grouting reinforced, so as to further improve the supporting effect of the base composite structure and the resistance to soil uplift.
[0046] Next, step S4 is performed to construct an upper supporting structure on the upper part of the interior of the external enclosure structure to form an upper lateral support.
[0047] In summary, in the base composite structure, internal support structure, and foundation pit retaining system provided by the utility model, the base composite structure includes: existing engineering piles of the foundation pit, a first elastic body structure arranged between the retaining piles of the foundation pit and adjacent existing engineering piles, and a second elastic body structure arranged between two adjacent existing engineering piles. The base composite structure of the utility model can meet the safety and stability of the foundation pit retaining system during the foundation pit construction process by utilizing the existing engineering piles to jointly bear the active earth pressure, and correspondingly reduces the engineering cost of the foundation pit retaining project, reduces the waste of materials, and meets the requirements of green construction and building protection.
[0048] On the other hand, when constructing the foundation pit maintenance system, before excavating the foundation pit, the existing engineering piles are used to form a base composite structure as the bottom support structure of the base to provide lateral support for the base, effectively improving the anti-overturning capacity of the foundation pit retaining system, while also improving the bearing capacity of the foundation and the ability to resist uneven settlement.
[0049] The above description is only a description of the preferred embodiment of the utility model, and is not any limitation on the scope of the utility model. Any changes and modifications made by ordinary technicians in the field of the utility model based on the above disclosure shall fall within the scope of protection of the claims.
Claims
1. A substrate composite structure, characterized in that: include: An existing engineering pile (2) of a foundation pit, a first elastic body structure (1) arranged between a retaining pile (5) of the foundation pit and an adjacent existing engineering pile (2), and a second elastic body structure (3) arranged between two adjacent existing engineering piles (2).
2. The substrate composite structure according to claim 1, characterized in that: It also includes a skirt reinforcement structure (4) which is arranged between the retaining pile (5) and the first elastomeric structure (1) so as to bond the retaining pile (5) and the first elastomeric structure (1).
3. An internal support structure, characterized in that: include: A bottom supporting structure and an upper supporting structure located above the bottom supporting structure, wherein the bottom supporting structure is the base composite structure as claimed in claim 1 or 2.
4. The internal support structure according to claim 3, characterized in that: The upper supporting structure is a concrete support.
5. A foundation pit retaining system, characterized in that: include: An external enclosure structure and an internal support structure as claimed in claim 3 or 4 arranged inside the external enclosure structure.
6. The foundation pit retaining system according to claim 5, characterized in that: The external enclosure structure is enclosure piles.