阅读说明：本技术 一种静压预应力管桩施工方法 (Static pressure prestressed pipe pile construction method ) 是由 袁肖 何家亮 何传志 施正阳 姜坤 刘璇 左海宏 周雨婷 覃鹤 张思斌 赵红霞 于 2021-08-04 设计创作，主要内容包括：本发明提供了一种静压预应力管桩施工方法,包括以下步骤：制备多根单元管桩；测量放线并确定桩位；在桩位中心钻攻导引孔；压桩机就位对中；将前置管桩压入地下土体；通过销杆接桩；接桩焊接；重复前述步骤若干次后,施工结束。采用本发明的技术方案,通过在地面上预先设置导引孔作为导向,通过在接桩时使用销杆定位,保证了相邻两根管桩对正,将接桩连接处设置于离地面0.5m-1m的高度,便于进行焊接操作,也便于调整管桩相对于地面的垂直度,有效防止压入管桩时出现偏斜,在接桩焊接前,对焊丝烘培、预热处理后,防止在焊接后形成的焊缝内出现气孔,防止焊缝出现裂纹,提升焊缝的机械性能和强度,提高了焊接质量,避免出现断桩。(The invention provides a construction method of a static pressure prestressed pipe pile, which comprises the following steps: preparing a plurality of unit tubular piles; measuring and paying off and determining pile positions; drilling a guide hole in the center of the pile position; the pile pressing machine is positioned and centered; pressing the preposed tubular pile into an underground soil body; pile splicing is carried out through a pin rod; pile splicing and welding; and repeating the steps for a plurality of times, and finishing the construction. By adopting the technical scheme of the invention, the guide holes are preset on the ground as a guide, the pin rods are used for positioning during pile splicing, the alignment of two adjacent tubular piles is ensured, the pile splicing joint is arranged at the height of 0.5-1 m from the ground, the welding operation is convenient, the verticality of the tubular pile relative to the ground is also convenient to adjust, the deviation during the pressing in of the tubular pile is effectively prevented, air holes are prevented from being formed in a welding seam formed after welding after the welding and cracks are prevented after the welding wire is baked and preheated before the pile splicing is welded, the mechanical property and the strength of the welding seam are improved, the welding quality is improved, and the pile breaking is avoided.)

1. A construction method of a static pressure prestressed pipe pile is characterized by comprising the following steps: the method comprises the following steps:

the method comprises the following steps: preparing a plurality of unit tubular piles, wherein flange rings are fixedly connected to two ends of each unit tubular pile, and a plurality of positioning holes are formed in the flange rings;

step two: and (3) measurement and paying-off: carrying out measurement and setting-out and rechecking according to a design drawing, and determining a pile position;

step three: drilling a guide hole in the center of the pile position in the second step;

step four: providing a pile pressing machine, moving the pile pressing machine to the pile position in the second step to enable the drill rod to be aligned with the pile position, wherein the alignment error is not more than 50 mm;

step five: taking the unit tubular pile in the first step, starting a pile pressing machine, pressing one end of the unit tubular pile into underground soil along the guide hole in the third step through the pile pressing machine, stopping the pile pressing machine when the relative height of the other end of the unit tubular pile and the ground at the pile position is smaller than the preset pile suspension height, and taking the unit tubular pile pressed into the underground soil as a front-mounted tubular pile;

step six: taking a plurality of pin rods, taking another unit tubular pile, placing one end of the unit tubular pile on the preposed tubular pile in the fifth step through the pin rods, extending the other end of the unit tubular pile upwards along the vertical direction, taking a welding wire, melting the welding wire by adopting a carbon dioxide gas shielded welding mode, condensing to form a welding line, and welding the unit tubular pile and the preposed tubular pile in the fifth step to form a combined tubular pile;

step seven: starting a pile pressing machine, applying acting force to the combined tubular pile in the step six through the pile pressing machine, pressing one end of the combined tubular pile into underground soil along the guide hole in the step three, stopping the pile pressing machine when the relative height of the other end of the combined tubular pile and the ground at the pile position is smaller than the preset pile suspension height, and taking the combined tubular pile pressed into the underground soil as a new front-mounted tubular pile;

step eight: and repeating the sixth step to the seventh step for a plurality of times, and finishing the construction.

2. The construction method of the static pressure prestressed pipe pile according to claim 1, characterized in that: and in the fifth step or the seventh step, the suspension height of the pile is 0.5m-1 m.

3. The construction method of the static pressure prestressed pipe pile according to claim 1, characterized in that: and fifthly, the ratio of the depth of the guide hole to the length of the unit tubular pile is not less than 2: 3.

4. The construction method of the static pressure prestressed pipe pile according to claim 1, characterized in that: in step six, the welding wire is of model CJ 556N.

5. The construction method of the static pressure prestressed pipe pile according to claim 1, characterized in that: the construction method of the static pressure prestressed pipe pile further comprises the following steps: and in the sixth step, after the welding seam formed between the unit tubular pile and the preposed tubular pile is naturally cooled for at least 10 minutes, the seventh step is carried out.

6. The construction method of the static pressure prestressed pipe pile according to claim 1, characterized in that: in the sixth step, a groove is polished between the unit tubular pile and the front tubular pile, and then the unit tubular pile and the front tubular pile are welded to form a combined tubular pile.

7. The construction method of the static pressure prestressed pipe pile as claimed in claim 6, wherein: the width of the groove is not less than 3 mm.

8. The construction method of the static pressure prestressed pipe pile according to claim 1, characterized in that: in the sixth step, the welding wires are sequentially baked and preheated, and then the unit tubular pile and the front tubular pile are welded to form the combined tubular pile.

9. The construction method of the static pressure prestressed pipe pile as claimed in claim 8, characterized in that: the baking temperature of the welding wire is 300-350 ℃, and the baking duration of the welding wire is not less than 1.5 h.

10. The construction method of the static pressure prestressed pipe pile as claimed in claim 8, characterized in that: the preheating temperature of the welding wire is 100-150 ℃, and the preheating duration is not less than 30 min.

Technical Field

The invention belongs to the technical field of constructional engineering, and particularly relates to a construction method of a static pressure prestressed pipe pile.

Background

In the field of building engineering, precast piles are a pile type which is frequently adopted in foundation treatment at present, particularly prestressed pipe piles, have the characteristics of controllable quality, low price and the like, are developed very quickly, have large social demand and are produced by manufacturers in large and medium cities across the country. At present, the prestressed pipe pile mainly adopts two modes of diesel hammer striking and static pressure of a static pile machine at home to forcibly strike the pipe pile into a foundation soil body, and has the advantages of simple construction process, high speed and relatively low cost. However, in the construction process of the prestressed pipe pile, due to uneven soil quality of the underground soil body, the prestressed pipe pile is subjected to uneven frictional resistance from the underground soil body around the prestressed pipe pile in the process of pressing the prestressed pipe pile into the soil body, so that the pipe pile is pressed into the soil body to be inclined, the verticality and the quality of the formed pipe pile are influenced, in addition, the pile connecting part of the prestressed pipe pile is contacted with sludge in the deep layer of the soil body after being pressed into the soil body, if the welding quality is not good, the pile breaking phenomenon is easy to occur, and the construction process is influenced.

Disclosure of Invention

In order to solve the technical problem, the invention provides a construction method of a static pressure prestressed pipe pile.

The invention is realized by the following technical scheme.

The invention provides a construction method of a static pressure prestressed pipe pile, which comprises the following steps:

the method comprises the following steps: preparing a plurality of unit tubular piles, wherein flange rings are fixedly connected to two ends of each unit tubular pile, and a plurality of positioning holes are formed in the flange rings;

step two: and (3) measurement and paying-off: carrying out measurement and setting-out and rechecking according to a design drawing, and determining a pile position;

step three: drilling a guide hole in the center of the pile position in the second step;

step four: providing a pile pressing machine, moving the pile pressing machine to the pile position in the second step to enable the drill rod to be aligned with the pile position, wherein the alignment error is not more than 50 mm;

step five: taking the unit tubular pile in the first step, starting a pile pressing machine, pressing one end of the unit tubular pile into underground soil along the guide hole in the third step through the pile pressing machine, stopping the pile pressing machine when the relative height of the other end of the unit tubular pile and the ground at the pile position is smaller than the preset pile suspension height, and taking the unit tubular pile pressed into the underground soil as a front-mounted tubular pile;

step six: taking a plurality of pin rods, taking another unit tubular pile, placing one end of the unit tubular pile on the preposed tubular pile in the fifth step through the pin rods, extending the other end of the unit tubular pile upwards along the vertical direction, taking a welding wire, melting the welding wire by adopting a carbon dioxide gas shielded welding mode, condensing to form a welding line, and welding the unit tubular pile and the preposed tubular pile in the fifth step to form a combined tubular pile;

step seven: starting a pile pressing machine, applying acting force to the combined tubular pile in the step six through the pile pressing machine, pressing one end of the combined tubular pile into underground soil along the guide hole in the step three, stopping the pile pressing machine when the relative height of the other end of the combined tubular pile and the ground at the pile position is smaller than the preset pile suspension height, and taking the combined tubular pile pressed into the underground soil as a new front-mounted tubular pile;

step eight: and repeating the sixth step to the seventh step for a plurality of times, and finishing the construction.

And in the fifth step or the seventh step, the suspension height of the pile is 0.5m-1 m.

And fifthly, the ratio of the depth of the guide hole to the length of the unit tubular pile is not less than 2: 3.

In step six, the welding wire is of model CJ 556N.

The construction method of the static pressure prestressed pipe pile further comprises the following steps: and in the sixth step, after the welding seam formed between the unit tubular pile and the preposed tubular pile is naturally cooled for at least 10 minutes, the seventh step is carried out.

In the sixth step, a groove is polished between the unit tubular pile and the front tubular pile, and then the unit tubular pile and the front tubular pile are welded to form a combined tubular pile.

The width of the groove is not less than 3 mm.

In the sixth step, the welding wires are sequentially baked and preheated, and then the unit tubular pile and the front tubular pile are welded to form the combined tubular pile.

The baking temperature of the welding wire is 300-350 ℃, and the baking duration of the welding wire is not less than 1.5 h.

The preheating temperature of the welding wire is 100-150 ℃, and the preheating duration is not less than 30 min.

The invention has the beneficial effects that: by adopting the technical scheme of the invention, the pipe piles are effectively prevented from being pressed into an underground soil body to be deflected by arranging the reasonable guide holes on the ground in advance, the alignment of two adjacent pipe piles is ensured by using the pin rods for positioning during pile splicing, the joint of the pile splicing is arranged at the height of 0.5-1 m away from the ground, the welding operation is convenient, the verticality of the pipe piles relative to the ground is also convenient to adjust, a foundation is laid for the pipe piles to be pressed into the underground soil body along the vertical downward direction all the time, in addition, before the pile splicing welding, after the baking and preheating treatment of the welding wires, the moisture contained in the welding wires can be fully evaporated, pores are prevented from being formed in the welding seams formed after the welding, cracks are prevented from being formed in the welding seams, the mechanical performance and the strength of the welding seams are improved, the mechanical performance, the structural strength and the bearing capacity of the welded pipe piles are further improved, and the welding wires are welded after the preheating treatment, effectively prevent moisture in the ambient air from causing the erosion to the welding wire, improved welding quality, avoid appearing disconnected stake.

Drawings

FIG. 1 is a flow chart of the construction process of the present invention.

Detailed Description

The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.

As shown in fig. 1, the invention provides a construction method of a static pressure prestressed pipe pile, which comprises the following steps of 1, and is characterized in that: the method comprises the following steps:

the method comprises the following steps: preparing a plurality of unit tubular piles, wherein flange rings are fixedly connected to two ends of each unit tubular pile, and a plurality of positioning holes are formed in the flange rings;

step two: and (3) measurement and paying-off: carrying out measurement and setting-out and rechecking according to a design drawing, and determining a pile position;

step three: drilling a guide hole in the center of the pile position in the second step;

step four: providing a pile pressing machine, moving the pile pressing machine to reach the pile position in the step two, and centering the drill rod with the pile position, wherein the centering error is not more than 50 mm;

step five: taking the unit tubular pile in the first step, starting a pile pressing machine, pressing one end of the unit tubular pile into underground soil along the guide holes in the third step by the pile pressing machine, stopping the pile pressing machine when the relative height of the other end of the unit tubular pile and the ground at the pile position is less than the preset pile suspension height, and taking the unit tubular pile pressed into the underground soil as a preposed tubular pile; and in the fifth step, the ratio of the depth of the guide holes to the length of the unit tubular piles is not less than 2: 3.

Step six: taking a plurality of pin rods, taking another unit tubular pile, placing one end of the unit tubular pile on the preposed tubular pile in the fifth step through the pin rods, extending the other end of the unit tubular pile upwards along the vertical direction, taking a welding wire, melting the welding wire by adopting a carbon dioxide gas shielded welding mode, condensing to form a welding line, and welding the unit tubular pile and the preposed tubular pile in the fifth step to form a combined tubular pile; further, in step six, the welding wire is model number CJ 556N. The construction method of the static pressure prestressed pipe pile further comprises the following steps: and in the sixth step, after the welding seam formed between the unit tubular pile and the preposed tubular pile is naturally cooled for at least 10 minutes, the seventh step is carried out. In the sixth step, a groove is polished between the unit tubular pile and the front tubular pile, and then the unit tubular pile and the front tubular pile are welded to form the combined tubular pile. The width of the groove is not less than 3 mm. In the sixth step, the welding wires are sequentially baked and preheated, and then the unit tubular pile and the preposed tubular pile are welded to form the combined tubular pile. The baking temperature of the welding wire is 300-350 ℃, and the baking duration of the welding wire is not less than 1.5 h. The preheating temperature of the welding wire is 100-150 ℃, and the preheating duration is not less than 30 min. The welding seam is in a closed ring shape surrounding the outer peripheral surface of the combined pipe pile.

Step seven: starting a pile pressing machine, applying acting force to the combined tubular pile in the step six through the pile pressing machine, pressing one end of the combined tubular pile into the underground soil body along the guide hole in the step three, stopping the pile pressing machine when the relative height of the other end of the combined tubular pile and the ground at the pile position is smaller than the preset pile suspension height, and taking the combined tubular pile pressed into the underground soil body as a new preposed tubular pile; further, the pile suspension height in the fifth step or the seventh step is 0.5m-1 m.

Step eight: and repeating the sixth step to the seventh step for a plurality of times, and finishing the construction.

By adopting the technical scheme of the invention, the pipe piles are effectively prevented from being pressed into an underground soil body to be deflected by arranging the reasonable guide holes on the ground in advance, the alignment of two adjacent pipe piles is ensured by using the pin rods for positioning during pile splicing, the joint of the pile splicing is arranged at the height of 0.5-1 m away from the ground, the welding operation is convenient, the verticality of the pipe piles relative to the ground is also convenient to adjust, a foundation is laid for the pipe piles to be pressed into the underground soil body along the vertical downward direction all the time, in addition, before the pile splicing welding, after the baking and preheating treatment of the welding wires, the moisture contained in the welding wires can be fully evaporated, pores are prevented from being formed in the welding seams formed after the welding, cracks are prevented from being formed in the welding seams, the mechanical performance and the strength of the welding seams are improved, the mechanical performance, the structural strength and the bearing capacity of the welded pipe piles are further improved, and the welding wires are welded after the preheating treatment, effectively prevent moisture in the ambient air from causing the erosion to the welding wire, improved welding quality, avoid appearing disconnected stake.