Obstacle removing method for post-construction of pile foundation on one side of double-plot common-wall structure
By extending the anchoring length of the bottom plate stressed steel bars on the first application plot and combining the block design, a dense blocking space is formed, which solves the impact of the first application plot on the later application plot construction, ensuring that the post-application plot piles are The smooth progress of foundation construction and construction safety have achieved savings in construction costs and time.
Patent Information
- Application Number
- CN202411889339.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2025-02-18
AI Technical Summary
In the case of tight land resources in the core area and different construction time, the first land application plot has a significant impact on the construction of the later land application plot, increasing the difficulty of construction, including the occupation of the construction area by exterior wall scaffolding, the lack of protective soil, and the impact on the first land application plot Safety of scaffolding outside the block and pollution and damage of reserved steel bars and waterproof layers.
By optimizing the reserved length of the steel bars on the base of the plot as lateral support, and combining the retaining system (blocking body) design to form a dense blocking space, organizing backfill outside the blocking area to ensure the work of the pile foundation construction of the subsequent blocking plot. surface and protect soil integrity.
Effectively solve the problems of lack of protective soil during dense pile foundation construction, lack of construction surface of large machinery, safety hazards of scaffolding outside the plot, pollution and burial of steel bars and waterproof layers on the base plate, optimization of construction processes, saving construction labor and cost.
Smart Images
Figure CN119466042A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of obstacle clearing during construction of adjacent plots of public buildings, and more particularly to an obstacle clearing method for construction after pile foundation on one side of a double-plot common wall structure. Background Art
[0002] With the acceleration of urbanization and the demand for economic growth, large public buildings and commercial office buildings continue to emerge in cities, especially in the core areas of cities. These construction projects are often restricted by regional conditions. In order to efficiently utilize underground space, most adjacent plots adopt the design of integrated bottom plate inner wall / exterior wall sharing to achieve interconnection and intercommunication of underground space. However, due to the differences in construction time of each project, the construction of the first plot has a significant impact on the construction of subsequent plots. Specifically, it is manifested in the following aspects:
[0003] 1. Tight land resources and tight pile foundation design: Tight land resources in the core area lead to tight pile foundation design, which increases the difficulty of construction.
[0004] 2. The external wall scaffolding occupies the construction area: the external wall scaffolding of the first construction plot occupies the pile foundation construction area of the later construction plot, resulting in the lack of protective soil for the pile foundation construction at the edge of the later construction plot and the lack of a working surface.
[0005] 3. Construction impact and protection requirements: The edge piles of the later construction plot are adjacent to the reserved steel bars and waterproof layer of the bottom plate of the earlier construction plot. It is necessary to ensure that the pile foundation construction of the later construction plot does not pollute or damage the reserved anchor steel bars and waterproof layer of the earlier construction plot.
[0006] 4. Safety considerations for external scaffolding: Scaffolding should be set up on the outer wall area of the site first, and its safety should not be affected during construction.
[0007] In this case, when the pile foundation design is relatively dense and the bottom plate and outer wall of the first-place plot have been cast, how to scientifically and efficiently organize the pile foundation construction of the subsequent plot so that it does not affect the safety of the external frame of the adjacent first-place plot and avoids pollution and damage to the reserved steel bars and the constructed waterproof layer of the first-place plot has become a difficult problem in engineering construction and a problem that technical personnel in this field urgently need to solve. Summary of the invention
[0008] To this end, the purpose of the present invention is to solve the problem that due to the shortage of land resources in the core area, there are differences in the construction time of each project, the construction of the first construction plot has a significant impact on the construction of the later construction plot, and increases the difficulty of construction.
[0009] The technical solution of the present invention is an obstacle removal method for the post-construction of the pile foundation on one side of the double-plot common wall structure, which analyzes the working conditions of the first plot and the second plot, and formulates construction steps according to the analysis results, specifically including the following steps:
[0010] S1. Optimize the node design of the first-place land, extend the anchorage length of the stress-bearing steel bars on the bottom plate of the first-place land, and extend the waterproof layer of the first-place land;
[0011] S2, making the blocking body, taking materials on site to make the blocking body;
[0012] S3. Protect the waterproof layer of the first-applied land. Before the construction of the barrier body, use covering materials to cover the joints of the waterproof layer of the first-applied land;
[0013] S4, installation of the blocking body, using the reserved steel bars in S1 as lateral supports to set up the blocking body;
[0014] S5. Backfill and compact the over-excavation area outside the baffle of the baffle body;
[0015] S6. Carry out pile foundation construction on the subsequent plot, level the construction site, and bury the steel casing after measurement and positioning.
[0016] According to the method of the present invention, the working condition analysis of the first-implementation plot and the later-implementation plot includes: the completion status of the first-implementation plot, the design density of the pile foundation of the later-implementation plot, the construction working surface and the lack of protective soil, and the use of a model to simulate adverse working conditions.
[0017] According to the method of the present invention, in S1, the anchorage length of the reserved steel bars is extended to 200-300 mm outside the scaffolding, and a primary joint is provided to ensure that the anchorage lengths of the upper and lower steel bars are unified, and the steel bars are used as lateral supporting horse stool bars for the blocking body.
[0018] According to the method of the present invention, the on-site materials in S2 at least include: wooden formwork, wooden beams, and round steel pipes, the wooden formwork is used as a retaining plate, the wooden beams are used as supporting keels, and the round steel pipes are used as auxiliary top supports.
[0019] According to the method of the present invention, the blocking body is installed in S4, and a 10-20 mm thick wooden template is installed at the end of the reserved steel bar. The top of the wooden template is 90-110 mm higher than the pile driving surface to prevent mud overflow during the hole forming process.
[0020] According to the method of the present invention, the wooden formworks are overlapped with each other, and the overlap width is 190-210mm; support keels are vertically arranged at the joints of the wooden formworks and fixed to the wooden formworks, and round steel pipes are used as auxiliary top supports, with one end of the round steel pipe obliquely pressing against the support keel, and the other end pressing against the bottom plate of the first applied plot.
[0021] According to the method of the present invention, the covering in S3 is a wooden formwork.
[0022] According to the method of the present invention, after the installation of the blocking body in S5 is completed, the backfill construction of the pile head protection soil is organized, the original soil in the site is used for backfilling, the garbage and debris on the base are cleaned, the accumulated water is removed, the backfill is layered, and it is compacted.
[0023] According to the method of the present invention, the compaction coefficient reaches above 0.85.
[0024] According to the method of the present invention, in the pile foundation construction of the post-implementation plot S6, the engineering piles are constructed by underwater pouring of concrete after drilling with a rotary drilling rig. During the drilling process of the rotary drilling rig, the steel casing maintains the stability of the pile hole, and its top surface is 190-210 mm above the ground.
[0025] It can be seen from the above technical solutions that, compared with the prior art, the present invention has the following technical effects:
[0026] The present invention optimizes the length of the reserved steel bars in the bottom slab of the first-stage plot as lateral support, and combines it with the design of a retaining system (blocking body) to form a dense blocking space, and then organizes backfilling outside the blocking area to solve a series of engineering problems such as the lack of pile foundation protection soil in dense pile foundation construction, lack of construction working surface for large machinery, safety hazards of scaffolding outside the first-stage plot, and pollution and burial of the reserved steel bars and waterproof layer in the bottom slab.
[0027] The present invention solves the problems of close distance between pile foundations of adjacent plots, lack of working surface for pile foundation construction, protection of soil, safety of external scaffolding of the first plot, quality of reserved steel bars and waterproof layer through reasonable design scheme, optimization of pile foundation construction and obstacle clearing during the construction of pile foundation at the edge of the project.
[0028] The invention optimizes the construction process, saves construction manpower, has a simple process principle, is easy to construct, occupies less resources, and greatly saves construction costs. At the same time, the materials used in the design of the space barrier clearance are common, easy to process, and reusable, and the cost is controllable. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.
[0030] Figure 1 A construction flow chart of an obstacle removal method for post-construction of a pile foundation on one side of a double-plot common wall structure provided by the present invention;
[0031] Figure 2 It is a structural diagram of the optimization process of Xianshi plot nodes;
[0032] Figure 3 A schematic diagram of the structure for setting a temporary protective layer for waterproof joints;
[0033] Figure 4 The structural diagram of the blocking body is shown;
[0034] Figure 5 The schematic diagram after the installation of the blocking body is shown;
[0035] Figure 6 The schematic diagram shows the aftermath of the construction of the subsequent body. DETAILED DESCRIPTION
[0036] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.
[0037] In the prior art, due to the shortage of land resources in the core area and the differences in the construction time of each project, the construction of the first-applied plot X has a significant impact on the construction of the later-applied plot H, increasing the difficulty of construction. For example, when the pile foundation at the edge of the later-applied plot H is about to be constructed, the first-applied plot X has completed the pouring of the bottom plate and the construction of part of the exterior wall. The scaffolding X3 of the first-applied plot erected in the exterior wall area occupies a certain width of the later-applied plot H. Affected by this, the local protective soil is missing during the pile foundation construction of the later-applied plot H and the pile-making machinery cannot enter. In addition, the pile foundation design of the project is relatively tight, and the pile body at the edge of the later-applied plot H is close to the external scaffolding, steel bars and waterproof layer X5 of the first plot. Through the analysis of this working condition, it can be seen that if the pile foundation construction of the later-applied plot H is to be carried out smoothly, the problems of lack of construction working surface and lack of protective soil must be solved, and during the pile foundation construction of the later-applied plot H, the rotary drilling rig shall not affect the safety of the external frame of the first-applied plot X, and the bottom plate steel bars and waterproof outer part shall be well protected.
[0038] In view of this, the technical solution of the present invention adopts a method of clearing obstacles by constructing the pile foundation on one side of the double-plot common wall structure, analyzes the working conditions of the first plot X and the later plot H, and formulates construction steps according to the analysis results, see the attached Figure 1 , specifically including the following steps:
[0039] S1. Optimize the design of the X node of the first-place land, extend the anchorage length of the stress-bearing steel bars of the X bottom plate of the first-place land, and extend the X5 extension of the X waterproof layer of the first-place land;
[0040] S2, making the blocking body, taking materials on site to make the blocking body;
[0041] S3, protect the waterproof layer X5 of the first applied land, and use covering materials to cover the joint of the waterproof layer X of the first applied land before the construction of the barrier body;
[0042] S4, installation of the blocking body, using the reserved steel bars in S1 as lateral supports to set up the blocking body;
[0043] S5. Backfill and compact the over-excavation area outside the baffle of the baffle body;
[0044] S6. After the construction of Pile Foundation of Block H, the construction site shall be leveled and the steel casing shall be buried after measurement and positioning.
[0045] The above construction steps of the present invention are: advance simulation of adverse working conditions through BIM technology, combined with the ideas of green energy saving and recycling of materials on site, and designing a comprehensive blocking system to form a dense protection space at the bottom of the external wall scaffolding of the first-implemented plot, so as to achieve the finished product protection of the joint part of the bottom plate of the first-implemented plot, ensure the safety of the external frame, and provide a working surface for the pile foundation construction of the subsequent plot.
[0046] Advantageously, the working condition analysis of the first-construction plot X and the later-construction plot H includes: the completion status of the first-construction plot X, the design tightness of the pile foundation of the later-construction plot H, and the lack of construction working surface and protective soil, and a model is used to simulate adverse working conditions, wherein the model simulation adopts BIM technology.
[0047] In order to facilitate the description and help those skilled in the art to understand the construction process, the present invention provides the following Figure 2-6 Further explanation: In order to prevent the names that may not be mentioned from affecting the understanding of the scheme, the attached Figure 2-6 The tags in are described as follows:
[0048] H post-implementation plot, H1 wooden formwork, H2 wooden beam, H3 round steel pipe, H4 temporary protective layer of waterproof joint, HT steel casing, HT0 position of steel casing to be installed, HY original foundation soil, HQ pile foundation protection soil backfill area, HQ0 pile foundation protection soil to be backfilled area, H0 designed position of cast-in-place pile;
[0049] X is the first plot, X1 is the first plot raft, X2 is the first plot exterior wall, X3 is the first plot scaffolding, X4 is the first plot reserved steel bars, X5 is the waterproof layer;
[0050] Z is the site line, W is the working position of the rotary drilling rig.
[0051] Those skilled in the art can clearly understand the specific implementation process of the present invention based on the description of the drawings and marks.
[0052] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0053] See attached Figure 2In S1, the anchorage length of the reserved steel bar X4 of the first-implementation plot is extended to 200-300mm outside the scaffolding, and a first-level joint is set to ensure the uniform length of the upper and lower iron bars, which are used as lateral supporting horse stool bars for the blocking body.
[0054] The configuration of the reserved steel bars X4 in the Xianshi plot can be designed as 32@200. Based on its large diameter, high strength and small spacing, 32 refers to the diameter of the steel bar, in millimeters (mm). Here, it means that the steel bar with a diameter of 32 mm is used. @200 is the steel bar spacing, which means that one such steel bar is placed every 200 mm along a certain direction (usually longitudinal or transverse).
[0055] Advantageously, see Appendix Figure 4 In the embodiment of the present invention, the on-site materials in S2 at least include: wooden formwork H1, wooden beam H2, and round steel pipe H3. The wooden formwork H1 is used as a retaining plate, the wooden beam H2 is used as a supporting keel, and the round steel pipe H3 is used as an auxiliary top support.
[0056] In the specific embodiments of the present invention, see the attached Figure 5 , S4 middle blocking body installation, install 10-20mm thick wooden template H1 at the end of the reserved steel bar X4 in the first construction block, the top of the wooden template H1 is 90-110mm higher than the piling surface to prevent mud overflow during the drilling process.
[0057] The wooden formwork is overlapped, see attached. Figure 4 The overlap width is 190-210mm, and 50×100mm vertical wooden beam keels are set at the overlapping joints between the wooden formworks and nailed together with the wooden formworks; vertical supporting keels are set at the joints of the wooden formwork H1 and fixed to the wooden formwork H1. At the same time, round steel pipe H3 is used as an auxiliary top support. One end of the round steel pipe is obliquely pressed against the supporting keel, and the other end is pressed against the bottom plate of the first-applied plot X.
[0058] In the embodiment of the present invention, the covering in S3 is a wooden formwork H1. Before the construction of the blocking system, the wooden formwork H1 is preferentially used to cover and protect the joints of the waterproof layer to avoid damaging the waterproof layer X5 during the setting of the blocking space and the construction of the pile foundation, thereby affecting the quality of the subsequent joint construction of the waterproof layer X5.
[0059] After the installation of the blocking body in S5 is completed, the backfill construction of the pile head protection soil is organized, the original soil in the site is used for backfilling, the garbage and debris at the base are cleaned, the accumulated water is removed, and the original foundation soil HY is transported to the backfill site for backfilling in layers. Each backfill layer does not exceed 300mm and can be compacted by manual compaction. Ensure that the compaction is repeated three times to achieve a compaction coefficient of more than 0.85, and the preferred compaction coefficient is 0.9. After the backfill is completed, the compaction degree is tested by test methods such as the ring knife method.
[0060] See attached Figure 6In the H pile foundation construction of the S6 middle and rear construction plot, the engineering piles are constructed by underwater pouring of concrete after drilling holes with a rotary drilling rig. The construction site is first leveled, and the steel casing is buried after measurement and positioning. The top surface of the steel casing is 190-210mm above the ground.
[0061] Among them, the rotary drilling rig drilling is to dig a pile hole in the foundation using a rotary drilling rig. Underwater concrete pouring construction refers to pouring concrete into the pile hole by pumping or other means after the pile hole is dug, ensuring that the concrete can evenly and densely fill the entire pile hole. During the process of rotary drilling rig drilling, a steel casing is usually installed around the pile hole to maintain the stability of the pile hole and prevent collapse. This casing can effectively support the surrounding soil and prevent the pile hole from deforming or collapsing during construction. The top surface of the steel casing is 190-210mm above the ground to prevent surface water from flowing into the pile hole, and it is also convenient for construction personnel to carry out subsequent operations and management.
[0062] During the above process, the overflow port needs to be set on the side away from the external frame to reduce the intrusion of mud on the blocking system. Due to the close distance to the scaffolding X3 of the first-place land, pay attention to the swing control of the rotary drilling rig during the drilling rig positioning and pile foundation construction to avoid contact with the scaffolding X3 of the first-place land during the rotation of the drilling rig.
[0063] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "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 one; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.
[0064] The present invention is applicable to similar working conditions and similar types of projects with integrated design of multiple plots, time difference in construction, tight pile foundation design, and large mutual influence between plots, so as to solve the situation that there is no operation surface for pile foundation construction of the later plots and the protection of finished products of each process affected by pile foundation construction is difficult. It is also applicable to similar projects with ultra-long structure construction and tight pile foundation design.
[0065] During the construction of pile foundations at the edge of the project, the present invention solves the problems of close distance between pile foundations of adjacent plots, lack of working surface for pile foundation construction, protection of soil and safety of scaffolding outside the first construction plot, reserved steel bars and waterproof layer quality through reasonable design scheme, optimization of pile foundation construction ideas and innovative obstacle removal technology. The present invention optimizes the construction process and saves construction manpower. It has simple process principle, simple construction and less resource occupation, which greatly saves construction costs. At the same time, the materials used in the design of obstacle removal in the blocking space are common, easy to process, reusable and cost-controllable. In the statistics of experimental construction, the main cost saving items of the application of this technology are as follows: saving 24,000 yuan in labor costs (300 yuan / day × 10 days × 8 people), saving 50,000 yuan in other measures, and saving a total of about 74,000 yuan in costs. The economic benefits are relatively significant and have good application value for similar working conditions and similar types of projects.
[0066] The present invention provides theoretical and technical support for projects of the same type and working conditions. It has strong applicability and promotion, and solves the problems of close distance between pile foundations of adjacent plots, lack of working surface for construction, protection of soil, safety of scaffolding outside the first construction plot, and quality of reserved steel bars and waterproof layers. This obstacle removal construction technology saves time and space during implementation, uses local materials, is simple and fast in construction, and is safe and environmentally friendly, which is of great significance to all participating units.
[0067] 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 present invention. 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 different embodiments or examples described in this specification.
[0068] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.
Claims
1. The obstacle removal method for the construction after the pile foundation on one side of the double-plot common wall structure is characterized by: Analyze the working conditions of the first and last plots, and formulate construction steps based on the analysis results, which specifically include the following steps: S1. Optimize the node design of the first-place plot, extend the anchorage length of the stress-bearing steel bars on the bottom plate of the first-place plot, and extend the waterproof layer of the first-place plot; S2, making the blocking body, taking materials on site to make the blocking body; S3. Protect the waterproof layer of the first-applied land. Before the construction of the barrier body, use covering materials to cover the joints of the waterproof layer of the first-applied land; S4, installation of the blocking body, using the reserved steel bars in S1 as lateral supports to set up the blocking body; S5. Backfill and compact the over-excavation area outside the baffle of the baffle body; S6. Carry out pile foundation construction on the subsequent plot, level the construction site, and bury the steel casing after measurement and positioning.
2. The obstacle removal method for post-construction of pile foundation on one side of a double-plot common wall structure according to claim 1 is characterized in that: The working condition analysis of the first-implementation plot and the later-implementation plot includes: the completion status of the first-implementation plot, the design tightness of the pile foundation of the later-implementation plot, the construction working surface and the lack of protective soil, and the use of models to simulate adverse working conditions.
3. The obstacle removal method for post-construction of pile foundation on one side of a double-plot common wall structure according to claim 1 is characterized in that: In S1, the reserved steel bar anchorage length is extended to 200-300mm outside the scaffolding, and a primary joint is set to ensure the uniform anchorage length of the upper and lower steel bars, which are used as lateral support horse stool bars for the blocking body.
4. The obstacle removal method for post-construction of pile foundation on one side of a double-plot common wall structure according to claim 1 is characterized in that: The materials obtained on site in S2 include at least: wooden formwork, wooden beams, and round steel pipes. The wooden formwork is used as a retaining wall, the wooden beams are used as supporting keels, and the round steel pipes are used as auxiliary top supports.
5. The obstacle clearing method for post-construction of pile foundation on one side of a double-plot common wall structure according to claim 4 is characterized in that: During the installation of the S4 blocking body, a 10-20mm thick wooden formwork is installed at the end of the reserved steel bars. The top of the wooden formwork is 90-110mm higher than the pile driving surface to prevent mud overflow during the drilling process.
6. The obstacle clearing method for post-construction of pile foundation on one side of a double-plot common wall structure according to claim 5, characterized in that: The wooden formworks are overlapped with each other, and the overlap width is 190-210mm. Support keels are vertically arranged at the joints of the wooden formworks and fixed to the wooden formworks. At the same time, round steel pipes are used as auxiliary top supports. One end of the round steel pipe is tilted to tighten the support keel, and the other end is tightened to the bottom plate of the first construction plot.
7. The obstacle clearing method for post-construction of pile foundation on one side of a double-plot common wall structure according to claim 4, characterized in that: The covering in S3 is wooden formwork.
8. The obstacle clearing method for post-construction of pile foundation on one side of a double-plot common wall structure according to claim 1, characterized in that: After the installation of the blocking body in S5 is completed, the backfill construction of the pile head protection soil is organized, the original soil on site is used for backfilling, the garbage and debris on the base are cleaned up, the accumulated water is removed, the backfill is layered, and it is compacted.
9. The obstacle clearing method for post-construction of pile foundation on one side of a double-plot common wall structure according to claim 8, characterized in that: The compaction coefficient reaches above 0.
85.
10. The obstacle clearing method for post-construction of pile foundation on one side of a double-plot common wall structure according to claim 8, characterized in that: For the pile foundation construction of the S6 middle and rear land, the engineering piles are drilled with a rotary drilling rig and then poured with concrete underwater. During the drilling process, the steel casing keeps the pile hole stable, and its top surface is 190-210mm above the ground.