阅读说明：本技术 一种钢板桩施工方法 (steel sheet pile construction method ) 是由 陈古龙 孙会峰 邱永钦 陈家棋 黄杰 潘宗华 熊舟 吴艺聪 郝裕祺 张仕鹏 蒋昊 于 2019-08-20 设计创作，主要内容包括：本发明涉及基坑支护工程技术领域,公开了一种钢板桩施工方法,包括以下步骤：步骤一、在施工地面标记各个桩位的位置；步骤二、将旋挖钻机移动至对应的桩位的位置并进行旋转钻孔,钻至预设的引孔深度后,将旋挖钻机的钻头回旋上提至施工地面,以形成引孔位；其中,旋挖钻机安装的钻头为螺旋钻头；步骤三、将静压桩机移动至引孔位的位置,通过静压桩机将钢板桩对准引孔位进行施打嵌入。通过在桩位旋转钻进并回旋上提的方式,实现非全出土引孔,一方面减少密实土层与钢板桩之间的摩擦力,另一方面避免引孔插桩后的回填桩孔作业,提高钢板桩的施打效率又能保证钢板桩的嵌入深度。(The invention relates to the technical field of foundation pit supporting engineering, and discloses a steel sheet pile construction method, which comprises the following steps: marking the position of each pile position on the construction ground; moving the rotary drilling rig to the position of the corresponding pile position, performing rotary drilling, and lifting a drill bit of the rotary drilling rig to the construction ground in a rotary manner after drilling to a preset guide hole depth to form a guide hole position; wherein, the drill bit arranged on the rotary drilling rig is a spiral drill bit; and step three, moving the static pressure pile machine to the position of the guide hole position, and aligning the steel plate pile to the guide hole position through the static pressure pile machine for driving and embedding. Through the mode of drilling in the pile position rotation and lifting that circles round, realize the guide hole that does not go out of the earth entirely, reduce the frictional force between closely knit soil layer and the steel sheet pile on the one hand, on the other hand avoids the backfill pile hole operation behind the guide hole stake insertion, improves the efficiency of beating of executing of steel sheet pile and can guarantee the embedding depth of steel sheet pile again.)

1. A steel sheet pile construction method is characterized by comprising the following steps:

Marking the position of each pile position on the construction ground;

moving the rotary drilling rig to the corresponding pile position, performing rotary drilling, and lifting a drill bit of the rotary drilling rig to the construction ground in a rotary manner after drilling to a preset guide hole depth to form a guide hole position; the drill bit installed on the rotary drilling rig is a spiral drill bit;

And step three, moving a static pressure pile machine to the position of the guide hole position, aligning a steel plate pile to the center of the guide hole position through the static pressure pile machine, and driving and embedding to complete embedding construction of the steel plate pile.

2. The steel sheet pile construction method according to claim 1, wherein in the step one, specifically:

Firstly, lofting and positioning each pile position on the construction ground, marking the positions of guide holes on the pile positions according to the guide hole intervals, leveling the construction site, and paving a steel plate on the construction site.

3. The steel sheet pile construction method according to claim 2, wherein in the first step, the hole guiding distance S is not more than 50 cm.

4. the steel sheet pile construction method according to claim 1, wherein in the second step, after the rotary drilling rig moves to the corresponding pile position, when a spiral drill bit of the rotary drilling rig is aligned with the pile position, the perpendicularity of the spiral drill bit is measured, the position of the spiral drill bit is adjusted so that the perpendicularity deviation of the spiral drill bit is within the perpendicularity deviation range of the pilot hole position, and then rotary drilling is performed.

5. the steel sheet pile construction method according to claim 4, wherein in the second step, the verticality β of the pilot hole site is less than or equal to 0.5% H, wherein H is the pilot hole depth.

6. The steel sheet pile construction method according to claim 1, wherein in the second step, a rotation speed of the auger bit at an upper half of the pilot hole site is less than a rotation speed at a lower half of the pilot hole site.

7. The steel sheet pile construction method according to claim 1, wherein in the second step, the depth H of the lead hole is not more than L-H, wherein L is the length of the steel sheet pile and H is the embedment depth of the steel sheet pile.

8. the steel sheet pile construction method according to any one of claims 1 to 7, wherein the rotary drilling rig is configured to keep a distance between the static pressure pile machine and the rotary drilling rig at or above a preset safety distance when a hole is led at each pile position;

Enabling the static pile machine to be closely arranged behind the rotary drilling rig and embedding the steel sheet pile;

the preset safety distance is a distance which meets the requirement of a normal working space of the rotary drilling rig and the static pressure pile machine.

Technical Field

The invention relates to the technical field of foundation pit supporting engineering, in particular to a steel sheet pile construction method.

background

Classifying according to different soil characteristics, wherein the third soil is defined as firming, and the firming concept is as follows: moderately dense cohesive soil or loess, moist soil containing crushed stones, pebbles or building material chips.

At present, in the construction of foundation pit engineering ground of an underground comprehensive pipe gallery, most of the foundation pit engineering ground can touch a solid soil layer, and the geological lithology of the foundation pit engineering ground comprises an artificial filling layer (the average layer thickness is about 3m), silty clay (the average layer thickness is about 5m), a sand layer (the average layer thickness is about 4m), limestone and limestone (the average layer thickness is about 2.5 m). The steel sheet pile penetrates through an artificial filling layer with the thickness of about 3m on the surface layer, then enters compact clay, coarse sand and a part of weathered mud rock stratum, is difficult to continuously penetrate through the compact coarse sand layer and the weathered mud rock stratum after being beaten to 6-8 m according to a conventional method, namely is difficult to beat and embed in a hard soil layer, and needs to continuously beat and pull out a disturbed soil body to reduce the density of the soil body, so that the steel sheet pile is easy to damage, the embedding depth cannot be met, the construction difficulty is high, and the efficiency is low.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: how to realize the embedding depth of the steel sheet pile in the solid soil layer and improve the driving efficiency of the steel sheet pile.

in order to solve the technical problem, the invention provides a steel sheet pile construction method, which comprises the following steps:

Marking the position of each pile position on the construction ground;

Moving the rotary drilling rig to the corresponding pile position, performing rotary drilling, and lifting a drill bit of the rotary drilling rig to the construction ground in a rotary manner after drilling to a preset guide hole depth to form a guide hole position; the drill bit installed on the rotary drilling rig is a spiral drill bit;

And step three, moving a static pressure pile machine to the position of the guide hole position, aligning a steel plate pile to the center of the guide hole position through the static pressure pile machine, and driving and embedding to complete embedding construction of the steel plate pile.

as a preferred scheme, in the step one, specifically:

firstly, lofting and positioning each pile position on the construction ground, marking the positions of guide holes on the pile positions according to the guide hole intervals, leveling the construction site, and paving a steel plate on the construction site.

Preferably, in the first step, the lead hole spacing S is less than or equal to 50 cm.

Preferably, in the second step, after the rotary drilling rig moves to the corresponding pile position, when the auger bit of the rotary drilling rig is aligned with the pile position, the perpendicularity of the auger bit is measured, and the position of the auger bit is adjusted so that the perpendicularity deviation of the auger bit is within the perpendicularity deviation range of the pilot hole position, and then rotary drilling is performed.

Preferably, in the second step, the verticality β of the lead hole position is less than or equal to 0.5% of H, wherein H is the depth of the lead hole.

Preferably, in the second step, the rotation speed of the auger bit in the upper half of the pilot hole site is less than that in the lower half of the pilot hole site.

Preferably, in the second step, the depth H of the lead hole is not greater than L-H, where L is the length of the steel sheet pile, and H is the embedding depth of the steel sheet pile.

As a preferred scheme, when the rotary drilling rig conducts hole guiding at each pile position, the distance between the static pressure pile machine and the rotary drilling rig is kept at or above a preset safety distance;

Enabling the static pile machine to be closely arranged behind the rotary drilling rig and embedding the steel sheet pile;

the preset safety distance is a distance which meets the requirement of a normal working space of the rotary drilling rig and the static pressure pile machine.

compared with the prior art, the steel sheet pile construction method provided by the embodiment of the invention has the beneficial effects that:

According to the embodiment of the invention, the rotary drilling rig is matched with the spiral drill bit to assemble the hole guiding equipment, the non-full-unearthed hole guiding is realized in a mode of rotary drilling and rotary lifting at the pile position, then the steel sheet pile is driven and embedded by aiming at the hole guiding position, on one hand, the non-full-unearthed hole guiding can reduce the compactness of a solid soil layer and reduce the friction force between the compact soil layer and the steel sheet pile, so that the steel sheet pile is embedded into the solid soil layer more quickly and better, and the embedding depth of the steel sheet pile is ensured, on the other hand, the earth regulation is not needed to carry out secondary leveling on a construction site, the operation of backfilling pile holes after the hole guiding and pile inserting is avoided, the practical operability is strong, the operation is flexible, the driving efficiency of the steel sheet pile can be improved, and the embedding.

Drawings

Fig. 1 is a flow chart of a steel sheet pile construction method according to a preferred embodiment of the present invention.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

As shown in fig. 1, a steel sheet pile construction method according to a preferred embodiment of the present invention includes the following steps:

marking the position of each pile position on the construction ground;

Moving the rotary drilling rig to the corresponding pile position, performing rotary drilling, and lifting a drill bit of the rotary drilling rig to the construction ground in a rotary manner after drilling to a preset guide hole depth to form a guide hole position; the drill bit installed on the rotary drilling rig is a spiral drill bit;

And step three, moving a static pressure pile machine to the position of the guide hole position, aligning a steel plate pile to the center of the guide hole position through the static pressure pile machine, and driving and embedding to complete embedding construction of the steel plate pile.

According to the steel sheet pile construction method based on the technical characteristics, the spiral drill bit is matched with the rotary drilling rig to assemble hole guiding equipment, non-full-unearthed guide holes are realized in a mode of rotary drilling and rotary lifting at the pile positions, then the steel sheet piles are driven and embedded by aiming at the guide hole positions, the non-full-unearthed guide holes can reduce the compactness of a solid soil layer and reduce the friction force between the solid soil layer and the steel sheet piles, so that the steel sheet piles are embedded into the solid soil layer more quickly and better, the embedding depth of the steel sheet piles is ensured, on the other hand, the earth moving direction does not need to be adjusted to carry out secondary leveling on a construction field, the backfilling pile hole operation after the guide hole pile insertion is avoided, the steel sheet pile construction method is an economic, safe and environment-friendly operation mode, is strong in practicability and flexible in operation, the driving efficiency of the steel sheet piles can be improved, the embedding depth of the steel sheet piles can be ensured, and, The construction cost is saved, the construction period is shortened, and good economic and social benefits are achieved.

The rotary drilling rig adopts a triple-I rotary drilling rig with the model number of SR250R, and is provided with a phi 500 bolt drill bit to assemble a hole guiding machine.

in this embodiment, in the step one, specifically: firstly, lofting and positioning each pile position on the construction ground, marking the positions of guide holes on the pile positions according to the guide hole intervals, clearing tree heads, concrete blocks and stones on the positions of the guide holes, leveling the construction site, and paving steel plates on the construction site to ensure construction safety. In addition, prior to hole drilling, geological data needs to be familiar and the hole drilling depth needs to be determined.

further, in the first step, the hole guiding distance S is not more than 50cm, and the hole guiding distance is controlled within 50cm, so that the compactness of a peripheral soil layer is prevented from being influenced.

In this embodiment, in the second step, after the rotary drilling rig moves to the corresponding position of the pile position, when the auger bit of the rotary drilling rig is aligned with the pile position, the perpendicularity of the auger bit is measured, and the position of the auger bit is adjusted, so that the perpendicularity deviation of the auger bit is within the range of the perpendicularity deviation of the pilot hole position, and after all parameters are modulated to be qualified, the perpendicularity of the auger bit needs to be controlled, and the pilot hole position after pilot hole is prevented from excessively inclining.

Further, in the second step, the verticality β of the pilot hole position is less than or equal to 0.5% of H, wherein H is the pilot hole depth, and the pilot hole position is guaranteed to have a good guiding effect on the steel sheet pile in the vertical direction.

in this embodiment, in the second step, the rotation speed of the auger bit in the upper half of the pilot hole site is less than that in the lower half of the pilot hole site, so that pilot holes are performed in a slow-first and fast-second manner, and situations such as offset when pilot holes start are avoided, so as to ensure the accuracy of the pilot hole site, wherein the upper half and the lower half are based on the vertical position relationship after the pilot hole site is completed, which is only for convenience of simplifying the description of the present invention, and therefore, the present invention is not limited thereto.

In this embodiment, in the second step, the depth H of the hole is not greater than L-H, where L is the length of the steel sheet pile, and H is the embedding depth of the steel sheet pile, and when determining the depth of the hole, a certain embedding depth needs to be reserved, so as to prevent the hole from affecting the compactness of the soil layer on the embedding part, and ensure that the steel sheet pile has a better embedding effect.

In this embodiment, when the rotary drilling rig conducts hole guiding at each pile position, the distance between the static pressure pile machine and the rotary drilling rig is kept at or above a preset safety distance; enabling the static pile machine to be closely arranged behind the rotary drilling rig and embedding the steel sheet pile; the steel sheet pile driving construction method is characterized in that the preset safety distance is the distance meeting the normal working space of the rotary drilling rig and the static pressure pile driver, the preset safety distance is specifically 10m, after hole leading is carried out and the compactness of a solid soil layer is reduced, the static pressure pile driver is used immediately in the preset safety distance to drive the steel sheet pile, the situation that the hole leading position recovers certain compactness under the action of gravity is avoided, the driving effect of the steel sheet pile is guaranteed, continuous construction is achieved, and the steel sheet pile driving construction method has the advantages of being environment-friendly and high in continuity.

To sum up, the embodiment of the invention provides a steel sheet pile construction method which has the following advantages: (1) the rotary drilling rig is adopted to be matched with the spiral drill bit to conduct hole leading, so that the assembly is simple and easy, and the disassembly and the assembly are convenient. The device can be easily operated in complex soil layers such as a hard soil layer and the like, and has the characteristic of simple mechanical modification; (2) the rotary drilling rig is matched with the spiral drill bit to realize hole leading in a non-full-unearthing mode, so that the friction force between a hard soil layer and the steel sheet pile is reduced, the influence on the compactness around the hard soil layer is low, and hole collapse is prevented; the operation of backfilling pile holes after hole guiding and pile inserting is avoided, the embedding depth driving efficiency of the steel sheet pile is ensured, and the steel sheet pile driving device has the characteristics of safety and quality and quantity guarantee; (3) according to the construction method, only a small amount of earthwork needs to be taken out, the earthwork does not need to be adjusted and transported for secondary field leveling, the static pile machine is constructed next to the rear surface of the rotary drilling rig, and after hole guiding is completed, the static pile machine is immediately used for driving the steel sheet pile within a preset safety distance, so that continuous construction is realized, and the construction method has the characteristics of environmental protection and high continuity; (4) the construction method is greatly improved from the conventional method, and the key steps of the construction process are summarized, so that technical support is provided for the support construction of the steel sheet pile in the solid soil layer. The construction efficiency can be greatly improved, the construction period is shortened, good social and economic benefits are achieved, a wide application space is provided in foundation pit supporting engineering construction, and the popularization value is high.

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