River-near narrow space pile foundation construction method
By setting up diversion pipes in the river channel and filling backfill soil to form a piling platform, the safety risks and quality issues in pile foundation construction in narrow spaces near the river were resolved, and safe and efficient pile foundation construction was achieved.
Patent Information
- Application Number
- CN202511083797.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-04
- Publication Date
- 2025-10-17
Smart Images
Figure CN120797714A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of building construction, in particular to a pile foundation construction method for a narrow space along a river. BACKGROUND
[0002] With the process of urbanization, many cities face urban waterlogging problems when the rainy season comes. To solve the problem of waterlogging in the area, many cities need to renovate the flood discharge and drainage facilities at the present stage to enhance the drainage capacity of the flood discharge channel. When constructing the retaining piles on the riverbanks on both sides of the flood discharge channel in the residential area to repair the flood discharge channel, the distance between the pile site and the existing buildings is about 3-5 m. When the river water cannot be cut off during construction, the river side of the pile site does not have a construction site, and the construction is close to the existing buildings. Therefore, the traditional method cannot be used for pile foundation construction in a narrow space along a river. SUMMARY
[0003] To overcome the defects of the prior art, a pile foundation construction method for a narrow space along a river is provided to solve the problem that the traditional method cannot be used for pile foundation construction in a narrow space along a river under the premise that the river water is continuously flowing.
[0004] To achieve the above-mentioned purpose, a pile foundation construction method for a narrow space along a river is provided, which comprises the following steps:
[0005] A diversion pipe is arranged in the river within the construction section of the pile foundation;
[0006] Backfill soil is filled in the river to form a piling platform, and the diversion pipe is buried in the backfill soil to connect the rivers on opposite ends of the piling platform;
[0007] A drilling machine is installed on the piling platform to construct pile foundations on opposite sides of the river;
[0008] After the pile foundation construction, the piling platform is excavated and the diversion pipe is removed, so that the river is connected.
[0009] Further, the backfill soil is filled in the river by using a vertical filling method to form a piling platform.
[0010] Further, the backfill soil is filled in the river by using a mixed filling method to form a piling platform.
[0011] Further, after the backfill soil is filled in the river, the soil is compacted by using a mechanical compaction method, and after the mechanical compaction, a road structure layer is laid.
[0012] Further, when the piling platform is excavated, the backfill soil is excavated layer by layer from top to bottom.
[0013] The beneficial effect of the present application is that the river-proximate narrow-space pile foundation construction method of the present application is due to the filling of the piling platform, the pile foundation construction falls on solid ground, and the distance from the existing building is widened; on the one hand, the risk of falling from the river during the pile foundation construction process is reduced, on the other hand, the influence of the construction machinery vibration on the existing building is reduced, the risk of building cracking is reduced, and the construction safety factor is high.
[0014] The river-proximate narrow-space pile foundation construction method of the present application increases the construction safety distance, reduces the expenditure of house appraisal fee, and reduces the engineering cost.
[0015] The river-proximate narrow-space pile foundation construction method of the present application effectively solves the problems of limited space for river-proximate operation, narrow operation space of the pile machine, difficulty in using machinery for field leveling, narrow space, and difficult adjustment of the drill rod, and improves the overall construction quality of the river-proximate pile foundation.
[0016] The river-proximate narrow-space pile foundation construction method of the present application uses the diversion pipeline to connect the upstream and downstream of the river channel in the construction section range of the pile foundation, so that the river continuously flows during the construction period, and no additional water pumping facilities or diversion facilities are needed, and the influence on the surrounding residents is small. BRIEF DESCRIPTION OF DRAWINGS
[0017] Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments made with reference to the following drawings:
[0018] Figures 1 to 2 The figure is a step schematic diagram of the river-proximate narrow-space pile foundation construction method of the embodiment of the present application.
[0019] Figure 3 The figure is a plan view of excavating the piling platform of the embodiment of the present application.
[0020] Figure 4 The figure is a sectional view of excavating the piling platform of the embodiment of the present application.
[0021] REFERENCE SIGNS:
[0022] Pile foundation 1, diversion pipeline 2, backfill soil 3. DETAILED DESCRIPTION
[0023] The present application will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related application, and are not a limitation on the application. In addition, it should be noted that only the parts related to the application are shown in the drawings for ease of description.
[0024] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and embodiments.
[0025] Referring to Figures 1 to 4 As shown in the drawings, the present application provides a pile foundation construction method for a narrow space along a river, comprising the following steps:
[0026] S1, a diversion pipeline 2 is arranged in the river within the construction section range of the pile foundation 1.
[0027] Specifically, before construction, the construction preparation work should be comprehensively organized according to the drawing requirements, geological exploration report, hydrological conditions and on-site construction environment, including technical preparation, material access acceptance preparation, site preparation and the like.
[0028] Investigate the underground pipelines, existing structures, dangerous houses and the like in the construction site and adjacent areas, according to the geological conditions, hydrological conditions and investigation situation of the construction area, prepare a deep foundation pit support excavation scheme, determine the pipe diameter, position, filling method and the like of the pre-buried pipe, prepare an emergency plan, and perform safety technical briefing to the construction personnel; prepare the quality proof documents, quality inspection reports, construction process test and the like of the related materials and products, such as pipe material inspection report, filling CBR detection report and the like.
[0029] Prepare the related facilities required for construction, such as water supply, power supply, road, drainage and material yard and the like; and prepare the mechanical equipment required for construction, such as self-unloading automobile, excavator, rotary excavator and the like; set necessary safety warning signs, warning lights, protection facilities and the like, and ensure that the on-site construction site has been enclosed.
[0030] Clean the site within the construction range, remove the surface obstacles, including small structures, weeds, tree roots and planting soil layers within the excavation engineering area, provide a clean and flat working environment for subsequent construction activities, and ensure smooth construction.
[0031] According to the river water flow, select a concrete pipeline with a suitable pipe diameter, and use a truck crane to hoist and install it to the river bottom, in order to prevent the filling from blocking the pipe opening, the pipe opening can be wrapped and blocked with a woven bag in advance.
[0032] S2, backfill soil 3 is filled in the river to form a piling platform, and the diversion pipeline 2 is buried in the backfill soil 3 to connect the rivers at opposite ends of the piling platform.
[0033] As a preferred embodiment, the backfill soil 3 is filled in the river to form a piling platform by using a vertical filling method.
[0034] As a preferred embodiment, the backfill soil 3 is filled in the river to form a piling platform by using a mixed filling method.
[0035] The vertical filling method (transverse full height filling) is to fill gradually according to the full height of each cross section from one end of the river channel within the construction section of the pile foundation 1, and is suitable for steep slopes and foundation pits that cannot be filled from bottom to top in layers. When the site conditions permit, the mixed filling method can be used for construction, in which the lower layer is filled transversely and the upper layer is filled horizontally in layers.
[0036] After filling the backfill soil 3 in the river channel, the road surface structure layer is paved after mechanical compaction.
[0037] The backfill soil needs to be compacted by machinery after filling. The compaction degree is implemented according to the design requirements to ensure that the pile foundation construction foundation does not settle, so as to avoid causing the drill pipe to tilt and affect the pile quality. The filling height is flush with the existing road surface.
[0038] S3, the drilling machine is installed on the piling platform to construct the pile foundation 1 on the opposite sides of the river channel.
[0039] When constructing the pile foundation, the total station and the level are used to measure the original ground surface of the site and make a record, and the measurement record and result data are submitted to the supervising engineer for examination and signature approval. According to the design and construction requirements, the position line of the support pile is measured in the river channel, the measurement and setting-out are carried out according to the conventional method, and the pile center is marked with white lime or the "cross intersection method".
[0040] The pile foundation construction is carried out according to the processes of casing embedding, drill rig positioning, drilling, hole forming, steel reinforcement cage lowering, guide pipe lowering, hole cleaning, and underwater concrete pouring.
[0041] When positioning the casing, the pile position should be rechecked first, then a cross control pile line perpendicular to each other is determined with the pile position as the center, and a cross bolt point control is made, the casing hole position is dug, the casing is hoisted and placed, and the casing center and the pile center are corrected with the cross line to make them coincide and consistent, and the deviation between the casing center position and the pile center is ensured to be less than 50 mm.
[0042] Before drilling, the height of the hole mouth casing top is measured with the level to control the drilling depth. When starting drilling, pay attention to the drilling speed and adjust the drilling speed of different strata. During drilling, the drilling speed should be slow at first and then fast. The drilling footage is 40-50 cm at the beginning, and the underground unfavorable stratum is confirmed. After 5 m of drilling footage, the drilling footage can be appropriately increased, and each time the control is in the range of 70-90 cm. During drilling, the drilling bucket size is checked frequently (the size can be determined according to the trial drilling situation). During drilling, the engineering detection ruler is used for observation and inspection at any time to adjust and control the verticality of the drill pipe.
[0043] After the drilling hole reaches the required depth, it is checked by the cast-in-place pile hole diameter monitoring system. After all the indicators meet the requirements, the hole is immediately cleaned. After hole inspection, the hole should be cleaned quickly and not stopped for a long time to avoid difficulties in hole cleaning work or even hole collapse.
[0044] To ensure the quality of reinforcement cage connection and the safety of site construction, the "cross" type four-point lifting appliance and movable rack are used for lifting the reinforcement cage. When the reinforcement cage is lifted into the hole, it should be aligned with the hole diameter and kept vertical, and then gently and slowly put into the hole. After entering the hole, it should be slowly lowered, and it is not suitable to rotate left and right. When the reinforcement cage is lowered, it should be slowly and evenly adjusted according to the depth of the cage, and the verticality of the reinforcement cage into the hole should be adjusted in time to avoid inclination and swing. The sleeve is installed before the reinforcement cage is lowered, and the sleeve is installed on the reinforcement at the top of the pile. The reinforcement at the top of the pile must be straight.
[0045] The pile foundation concrete is transported by tank truck and poured through the guide pipe. After pouring starts, it should be carried out continuously, and it is strictly prohibited to stop work in the middle. During the pouring process, the concrete mixture should be prevented from overflowing from the top of the funnel or falling into the hole bottom from the outside of the funnel, so that the mud contains cement and becomes thick and coagulated, resulting in inaccurate detection. Attention should be paid to the observation of the descending of the concrete in the pipe and the rising of the water level in the hole, and the height of the concrete surface in the hole should be measured in time to correctly guide the lifting and removal of the guide pipe. The buried depth of the guide pipe should be controlled within 2-6m. At the same time, the position of the concrete surface in the hole should be measured frequently, and the buried depth of the guide pipe should be adjusted in time.
[0046] When the guide pipe is lifted, the axis should be kept vertical and the position should be kept in the center, and it should be lifted gradually. If the guide pipe flange is hung on the reinforcement cage, the guide pipe can be rotated to make it separate from the reinforcement cage, and then it can be moved to the center of the hole.
[0047] During the pouring process, the height of the concrete surface rising should be measured every 2m 3 left and right, and the filling coefficient of each pile body should be determined, and it should be recorded carefully, which plays a great role in finding the problem pile in the future or evaluating the quality of the pile. According to the design requirements, the filling coefficient should not be less than 1.00.
[0048] After the construction of the bored pile is completed and the strength reaches, the crown beam soil excavation limit is determined by the surveying and setting out, and the crown beam foundation soil excavation is carried out to the bottom of the crown beam (waist beam) by using the excavator. The position of the pile is cleaned by manual and mechanical methods, and the soil between the pile and the pile is removed to the design bottom elevation of the crown beam and waist beam. Then the formwork is supported, the reinforcement is bound, and the concrete is poured in turn.
[0049] When the concrete is poured, the test piece is cured at the same time and under the same conditions, and the age and strength of the concrete are used as the basis for non-destructive testing of the pile foundation. After the pile foundation construction is completed and the concrete strength meets the detection requirements, the detection unit should be contacted in time for detection. The ultrasonic method is used for detection, and after the detection is completed and qualified, the pile foundation is finally accepted. The following information should be provided when the pile foundation is accepted: pile position surveying and setting out drawing, material test record, pile position completion plan and pile top elevation, pile detection record and conclusion.
[0050] S4, after the construction of the pile foundation 1, the piling platform is excavated and the guide pipe 2 is removed, so that the river is connected.
[0051] As a preferred embodiment, when excavating the piling platform, the backfill soil 3 is excavated in layers from top to bottom.
[0052] In the present embodiment, referring to Figures 2 to 4 , the total earthwork excavation of the piling platform is divided into four stages:
[0053] The first stage is the earthwork excavation from the ground surface to the top of the first concrete support beam of the pile foundation. According to the site conditions, the east side soil and rock is excavated first. During excavation, the pavement structure layer is broken, and then the pavement structure soil and rock is excavated in turn, and the rubble retaining wall is broken. The earthwork is excavated in layers to the bottom of the first concrete support;
[0054] The second stage is the earthwork excavation from the bottom of the first concrete support to 20 cm below the bottom of the second steel support. The earthwork is excavated in layers, and the thickness of each layer is 1.5-2.0 m;
[0055] The third stage is the earthwork excavation from 20 cm below the bottom of the second steel support to 30 cm above the bottom of the foundation pit. The earthwork is excavated in layers, and the thickness of each layer is 1.5-2.0 m;
[0056] The fourth stage is to manually clean the soil layer about 15-30 cm above the bottom of the foundation pit. After the excavation is completed, the foundation pit should be inspected and the cushion concrete should be poured in time to prevent the foundation pit from being soaked.
[0057] The excavation method uses a crawler-type backhoe excavator combined with a self-unloading truck for transportation. The excavation is from top to bottom. First, the topsoil is removed using the excavator. Then, the earthwork to be excavated is exposed. During the excavation process, the following five points should be mastered: layering, step-by-step, symmetry, balance, and time limit. The construction principle of "vertical layering and longitudinal segmentation" should be followed. The excavation space and rate of the foundation pit soil body should be coordinated with each other. The step-by-step excavation length should not be greater than 10 m, and the excavation step height or thickness should not be greater than 2 m.
[0058] The riverfront narrow space pile foundation construction method of the present application has the following advantages: due to the filling of the piling platform, the pile foundation construction falls on solid ground, and the distance from the existing building is widened. On the one hand, it reduces the risk of falling into the river during pile foundation construction, and on the other hand, it reduces the impact of construction machinery vibration on the existing building, reduces the risk of building cracking, and has a high construction safety factor.
[0059] Due to the original mechanical access near the building's water dispersion position, in order to reduce disputes, the cost of building appraisal needs to be increased. The riverfront narrow space pile foundation construction method of the present application increases the construction safety distance, reduces the expenditure of building appraisal cost, and reduces the engineering cost.
[0060] Due to the limited space for operation near the river, the operation area of the pile machine is narrow, the site is difficult to use the machine for site leveling, the space is narrow, the drill rod is difficult to adjust, and the original construction method is prone to cause pile displacement, inclination and other quality problems. The river narrow space pile foundation construction method effectively solves the occurrence of this part of the quality hidden trouble, and improves the overall construction quality of the river pile foundation.
[0061] The river narrow space pile foundation construction method of the application connects the upstream and downstream of the river channel in the construction section range of the pile foundation by using the flow guide pipe, so that the river continuously flows during construction, without the need to increase additional water pumping facilities or flow changing facilities, and has little influence on the surrounding residents.
[0062] The above description is only the preferred embodiment of the application and the explanation of the applied technical principles. Those skilled in the art should understand that the scope of the application involved in the application is not limited to the technical solutions formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features disclosed in the application (but not limited to) having similar functions to form a technical solution.
Claims
1. A method for constructing pile foundations in narrow riverside spaces, characterized in that: The following steps are involved: Set up diversion pipes in the river channel within the construction area of the pile foundation; Backfill soil is built in the river channel to form a piling platform, and the diversion pipe is buried in the backfill soil to connect the rivers at opposite ends of the piling platform; A drilling machine is installed on the piling platform to construct pile foundations on opposite sides of the river channel; After the pile foundation is constructed, the piling platform is excavated and the diversion pipe is removed, so that the river is connected.
2. The method for constructing pile foundations in narrow river spaces according to claim 1, characterized in that: A vertical filling method is adopted to fill backfill soil in the river channel to form a piling platform.
3. The method for constructing pile foundations in narrow river spaces according to claim 1, characterized in that: A mixed filling method is adopted to fill backfill soil in the river channel to form a piling platform.
4. The method for constructing pile foundation in narrow river space according to claim 1 is characterized in that After the backfill soil is filled in the river channel, it is compacted mechanically, and after the mechanical compaction, the road surface structure layer is laid.
5. The method for constructing pile foundations in narrow river spaces according to claim 1, characterized in that: When excavating the piling platform, the backfill soil is excavated layer by layer from top to bottom.