阅读说明：本技术 装配式地螺丝基础桩施工方法 (Construction method of assembly type ground screw foundation pile ) 是由 苏青峰 董洋洋 王剑 周珂 李斌 孙潇 李小星 于 2021-08-27 设计创作，主要内容包括：本发明公开了一种装配式地螺丝基础桩施工方法,包括：对土层经清理整平,将现场内地的渣土、工程废料、宿根性杂草、树根及其他有害污染物清除干净；根据设计图纸要求,放线人员现场定点放线；安装电动旋紧机主机,将电动旋紧机主机安放在地螺丝法兰盘上,用配套螺栓进行固定旋紧；固定电动旋紧机主机；启动电动旋紧机开关,确保地螺丝垂直钻进土层；拆除电动旋紧机；安装地螺丝基础桩的上部连接件。本发明地螺丝桩结构简单、成本低,施工速度快,不需水泥浇注,避免污染环境,并且可回收利用,对地表破坏少,易于恢复原地形地貌,还可解决管线复杂、空间狭小传统桩基工艺施工困难的问题。(The invention discloses a construction method of an assembly type ground screw foundation pile, which comprises the following steps: cleaning and leveling a soil layer, and removing dregs, engineering waste, perennial weeds, tree roots and other harmful pollutants in an in-situ land; paying off at a fixed point on site by paying-off personnel according to the requirements of design drawings; installing a main machine of the electric screwing machine, placing the main machine of the electric screwing machine on a ground screw flange plate, and fixedly screwing by using a matched bolt; fixing the main machine of the electric screwing machine; starting a switch of the electric screwing machine to ensure that the ground screw vertically drills into a soil layer; dismantling the electric screwing machine; and installing an upper connecting piece of the foundation pile of the ground screw. The ground screw pile has the advantages of simple structure, low cost, high construction speed, no need of cement pouring, environmental pollution avoidance, recycling, less damage to the ground surface, easy recovery of the original landform and landform, and capability of solving the problem of difficult construction of the traditional pile foundation process with complex pipeline and narrow space.)

1. The construction method of the assembly type ground screw foundation pile is characterized by comprising the following steps:

carrying out geotechnical engineering investigation on a construction site, finding out the type, depth, distribution and engineering characteristics of foundation soil in a site, cleaning and leveling a soil layer, and removing dregs, engineering waste, perennial weeds, tree roots and other harmful pollutants in the site;

according to the requirements of design drawings, paying off personnel pay off at fixed points on site to ensure accurate position;

firstly, positioning a ground screw, manually screwing the ground screw into a soil layer by 5-6cm at a measuring point to perform temporary fixation, then installing a main electric screwing machine, placing the main electric screwing machine on a ground screw flange plate, and fixedly screwing by using a matched bolt;

one person holds up the well-installed electric screwing machine main engine stably, the other person fixes the support arm pipe through a buckle on an extension rod of the main engine, fixes the two side foot forks by the u-shaped steel bar, and strikes the u-shaped steel bar into the stratum by the hammer to ensure that the support arm pipe is firmly installed;

starting a switch of the electric screwing machine, controlling the drilling speed of the ground screw to be 20-30cm/min, and during the operation of the machine, holding the main machine of the screwing machine by one person, and stepping the stable supporting arm pipes by two persons respectively to ensure that the ground screw vertically drills into a soil layer;

dismantling the electric screwing machine, namely dismantling the foot fork, pressing the buckle plate, dismantling the support arm pipe, dismantling the foot fork and the support arm pipe, loosening the screw, dismantling the flange plate of the main machine and removing the main machine;

and installing an upper connecting piece of the foundation pile of the ground screw.

2. The assembly-type ground screw foundation pile construction method according to claim 1, wherein the soil layer comprises silt, mucky soil, plain filling soil, plastic cohesive soil, medium dense fine sand, medium dense fine soil, slightly dense medium coarse sand, gravel sand and loess.

3. The assembly type ground screw foundation pile construction method according to claim 1, wherein an elevation deviation is controlled to be 50mm, a position deviation single row pile is controlled to be 10mm, and pile group is controlled to be 20mm when a fixed point is set out.

4. The assembly type ground screw foundation pile construction method according to claim 1, wherein before connecting a power supply, a machine starting switch is ensured to be in a closed state, and before starting the main machine, the two side foot forks are confirmed to be firmly fixed again, and the level is adjusted.

5. The assembly type ground screw foundation pile construction method of claim 1, wherein the transition to the low speed is made when the top surface of the ground screw is 20cm from the designed elevation, and the stop operation is made during the transition and stopped when the ground screw is installed at a designated height.

6. The assembly type ground screw foundation pile construction method according to claim 1, wherein the ground screw comprises a drill bit and a drill rod, the surface of the drill bit is provided with threads, the drill rod is a hot-forged pipe body, and the top end of the drill rod is provided with a flange.

Technical Field

The invention relates to a construction method of an assembled ground screw foundation pile, and belongs to the technical field of building construction.

Background

The pile foundation construction process adopted in the current engineering mainly comprises a cast-in-place pile, a dynamic compaction, a vibration pipe sinking cast-in-place pile, a guide hole pipe sinking cast-in-place pile, a spiral drilling mud jacking pile, a manual hole digging cast-in-place pile and the like, and the traditional construction processes have the defects of difficulty in construction quality control, pollution to the environment caused by slurry overflow, complex working procedures and the like. Meanwhile, the problems of long construction period and high dismantling difficulty also exist in the construction of small pile foundations or temporary facility pile foundations adopted in light steel structure buildings, billboards, wooden trestles and the like, and the practicability of the scene is not strong.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a construction method of an assembly type ground screw foundation pile, which has the advantages of simple structure, low cost, high construction speed, no need of cement pouring, environmental pollution avoidance, recycling, less damage to the ground surface, easiness in recovering the original landform and configuration and capability of solving the problem of difficult construction of the traditional pile foundation process with complex pipeline and narrow space.

In order to solve the technical problem, the invention provides a construction method of an assembly type ground screw foundation pile, which comprises the following steps:

carrying out geotechnical engineering investigation on a construction site, finding out the type, depth, distribution and engineering characteristics of foundation soil in a site, cleaning and leveling a soil layer, and removing dregs, engineering waste, perennial weeds, tree roots and other harmful pollutants in the site;

according to the requirements of design drawings, paying off personnel pay off at fixed points on site to ensure accurate position;

firstly, positioning a ground screw, manually screwing the ground screw into a soil layer by 5-6cm at a measuring point to perform temporary fixation, then installing a main electric screwing machine, placing the main electric screwing machine on a ground screw flange plate, and fixedly screwing by using a matched bolt;

one person holds up the well-installed electric screwing machine main engine stably, the other person fixes the support arm pipe through a buckle on an extension rod of the main engine, fixes the two side foot forks by the u-shaped steel bar, and strikes the u-shaped steel bar into the stratum by the hammer to ensure that the support arm pipe is firmly installed;

starting a switch of the electric screwing machine, controlling the drilling speed of the ground screw to be 20-30cm/min, and during the operation of the machine, holding the main machine of the screwing machine by one person, and stepping the stable supporting arm pipes by two persons respectively to ensure that the ground screw vertically drills into a soil layer;

dismantling the electric screwing machine, namely dismantling the foot fork, pressing the buckle plate, dismantling the support arm pipe, dismantling the foot fork and the support arm pipe, loosening the screw, dismantling the flange plate of the main machine and removing the main machine;

and installing an upper connecting piece of the foundation pile of the ground screw.

Further, the soil layer comprises silt, mucky soil, plain filling soil, plastic clay soil, medium dense fine sand, medium dense silt soil, slightly dense medium coarse sand, gravel sand and loess.

Furthermore, when fixed-point setting-out is carried out, the elevation deviation is controlled to be 50mm, the position deviation single-row piles are controlled to be 10mm, and pile group is controlled to be 20 mm.

Further, before connecting the power, ensure that the machine starting switch is in the off state, before starting the host computer, confirm again that both sides fork is fixed firm, the level of adjustment.

Further, when the top surface of the ground screw is 20cm away from the designed elevation, the speed is switched to the low speed, and during the switching, the operation is stopped, and the ground screw is stopped when being installed at the designated height.

Further, the ground screw comprises a drill bit and a drill rod, wherein the surface of the drill bit is provided with a spiral sheet, the drill rod is a hot forging pipe body, and the top end of the drill rod is provided with a flange plate.

The invention achieves the following beneficial effects:

(1) the invention does not need to damage the surrounding environment, does not need to dig the land and pour cement, and the ground screw pile foundation is directly driven into the stratum by the screwing machine, thereby having low construction noise, no mud pollution, no slag and soil outward transportation and no building dust. After the device is used as a temporary facility, the device can be pulled out only by reverse rotation, the reuse rate of 100 percent can be realized, and the device conforms to the concept of energy conservation and environmental protection.

(2) The pile foundation adopts professional mechanical equipment, construction speed is fast, and the upper member can be immediately installed after piling is finished. The construction only occupies very little space, to the pipeline complicacy, in the narrow and small urban area in space, after professional detection instrument surveys, can follow the narrow and small space screw in ground pile of pipeline, compares traditional cement pile foundation and need excavate etc. and simple high-efficient, the advantage is obvious.

(3) The equipment required by the installation of the ground screw can be simple and is more convenient to operate, only two persons can independently complete the operation after simple explanation and training, the operation period is short, and the dependence on water resources is small.

(4) The whole process of manufacturing the ground screw pile body is completed in a factory, automatic welding is adopted in the processes of welding and the like, the defects of manual welding are reduced, and compared with the traditional cement pile foundation, the ground screw pile body is completed by semi-manual prefabrication or is poured underground, and the quality is stable and controllable.

Drawings

FIG. 1 is a schematic view of the structure of the screw of the present invention.

Detailed Description

The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

As shown in figure 1, the ground screw comprises a drill bit 1 and a drill rod 2, wherein the surface of the drill bit 1 is provided with threads so as to improve the frictional resistance of the ground screw. The drill rod 2 is a hot-forged pipe body, a flange plate 3 is arranged at the top end of the drill rod 2, and the whole hot galvanizing treatment is carried out. The ground screw is drilled into the stratum to the designed elevation through the electric screwing machine, and a pile foundation with certain bearing capacity is formed. The working principle is the same as that of a self-tapping screw, and soil is tapped, drilled, extruded and pressed into corresponding threads to be tightly matched with each other.

The invention provides a construction method of an assembly type ground screw foundation pile, which comprises the following steps:

1. site preparation

(1) Carrying out geotechnical engineering investigation on a construction site, finding out the type, depth, distribution and engineering characteristics of foundation soil in the site, and cleaning and leveling soil layers such as silt, mucky soil, plain filling soil, soft-plastic cohesive soil, loose-medium dense silty fine sand, slightly-medium dense silty soil, loose-slightly dense medium coarse sand, gravel sand, loess and the like to construct a ground screw pile foundation; for the soil layer which contains a lot of boulders or obstacles and is difficult to remove, hard plastic and hard cohesive soil, dense sand soil and soil layer with groundwater seepage influencing the pile forming quality, the soil body at the position of the ground screw pile foundation can be filled and compacted again by machines such as a digging machine, and the ground screw pile foundation is constructed after the bearing requirements are met.

(2) The method is characterized in that dregs, engineering waste, perennial weeds, tree roots and other harmful pollutants in the in-situ land are removed completely, the earthwork balance of a leveling area is considered, a bulldozer and a mini excavator can be matched for construction operation, and the control of the ground elevation needs to be paid attention to at any time during construction.

2. Measuring line

According to the requirements of design drawings, paying-off personnel pay off at fixed points on site to ensure that the position is accurate, the elevation deviation is controlled to be 50mm, the position deviation single-row piles are controlled to be 10mm, the group piles are controlled to be 20mm, the accuracy of the paying-off position is checked before ground screw piles are constructed, and the position and the elevation of the ground screw pile foundation after construction meet the design requirements.

3. Main unit installation of electric screw machine

Firstly, positioning a ground screw, matching two persons, manually screwing the ground screw into a soil layer by about 5cm at a measuring point to perform temporary fixation, and before the next step, righting the ground screw by one person to prevent the ground screw from overturning; and then installing the main machine of the electric screwing machine, placing the main machine of the electric screwing machine on a ground screw flange plate by matching two persons due to the fact that the main machine is heavy, and fixedly screwing by using a matched bolt.

4. Arm pipe mounting

The supporting arm pipe mainly plays the roles of supporting stably, keeping ground screws vertical and the like in the construction process, one person holds up the just installed electric screwing host machine stably, one person fixes the supporting arm pipe through the buckle on the host machine extension rod, fixes the two-side foot forks by the u-shaped steel bar with phi 120mm, and knocks the u-shaped steel bar into the stratum by the hammer to ensure that the supporting arm pipe is firmly installed.

5. Starting ground screw tightening machine

Before connecting the power supply, ensuring that a machine starting switch is in a closed state, before starting the main machine, confirming that two side foot forks are firmly fixed again, adjusting the level, starting a screwing machine switch, and controlling the drilling speed of a ground screw to be 20-30 cm/min. During the operation of the machine, one person holds the main machine of the screwing machine stably, and two persons respectively step on the stable supporting arm pipes to ensure that the ground screws vertically drill into the soil layer.

When the top surface of the ground screw is 20cm away from the designed elevation, the speed is switched to the low speed, and the operation must be stopped during the switching process, and the ground screw is stopped when being installed at the designated height. During the working period of the ground screw tightening machine, a specially-assigned person needs to operate the ground screw tightening machine in the whole process, and the ground screw tightening machine cannot be separated from a post.

6. Removal of electric screwing machines

Firstly, the foot fork is dismantled, then the buckle plate is pressed, the supporting arm pipe is dismantled, the foot fork and the supporting arm pipe are dismantled, and a person should hold up the electric screwing machine main machine stably to prevent and control overturning. And finally, loosening the screws, detaching the lower flange of the main machine and removing the main machine. When the screwing machine is dismantled, the ground screw pile foundation cannot be disturbed.

7. Ground screw test pile (pulling resistance detection)

According to the regulation of technical Specifications of building pile foundations (JGJ94-2008), when a new pile type or a new process is adopted, the detection number is not less than 3 under the same condition, and is not less than 1% of the total pile number; when the total number of the engineering piles is within 50, the number of the engineering piles is not less than 2.

In geological field exploration and climate investigation in various places such as Heilongjiang, Shandong, Jiangsu, Hubei and the like, a new pile type or a new process adopted in the local area calculates the tensile design value of the ground screw to be not less than 20KN, namely the design requirement is met, and the maximum tensile value of the ground screw reaches 22.17KN through pile test detection, so that the design requirement is met.

8. Upper attachment fitting

According to different upper structures of foundation of the ground screw pile, the connecting piece is selected reasonably.

The invention does not need to damage the surrounding environment, does not need to dig the land and pour cement, and the ground screw pile foundation is directly driven into the stratum by the screwing machine, thereby having low construction noise, no mud pollution, no slag and soil outward transportation and no building dust. After the device is used as a temporary facility, the device can be pulled out only by reverse rotation, the reuse rate of 100 percent can be realized, and the device conforms to the concept of energy conservation and environmental protection.

The pile foundation adopts professional mechanical equipment, construction speed is fast, and the upper member can be immediately installed after piling is finished. The construction only occupies very little space, to the pipeline complicacy, in the narrow and small urban area in space, after professional detection instrument surveys, can follow the narrow and small space screw in ground pile of pipeline, compares traditional cement pile foundation and need excavate etc. and simple high-efficient, the advantage is obvious.

The equipment required by the installation of the ground screw can be simple and is more convenient to operate, only two persons can independently complete the operation after simple explanation and training, the operation period is short, and the dependence on water resources is small.

The whole process of manufacturing the ground screw pile body is completed in a factory, automatic welding is adopted in the processes of welding and the like, the defects of manual welding are reduced, and compared with the traditional cement pile foundation, the ground screw pile body is completed by semi-manual prefabrication or is poured underground, and the quality is stable and controllable.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.