阅读说明：本技术 一种生根增强型灌注桩施工工艺 (Construction process of rooting enhanced cast-in-place pile ) 是由 张增胜 韩石修 刘洋 孙立彬 康伟 张硕 于 2021-09-24 设计创作，主要内容包括：本发明是一种生根增强型灌注桩施工工艺,在灌注桩成孔工序后或下放钢筋笼后增加此工艺,具体步骤如下：a成孔工序后：在桩身不同的标高处,从桩身向外伸出长条形构件,随后进行下钢筋笼、清孔等常规灌注桩施工工序,在浇筑灌注桩混凝土时,长条形构件在桩身方向预留的钢筋或其他连接构造与桩基混凝土、钢筋笼连接为一个整体,最终在地层中形成一个类似狼牙棒状的灌注桩；b下放钢筋笼工序后：利用钢结构形式,预制长条形构件,在下放钢筋笼后,放置此钢结构构件,随后再进行混凝土浇筑等后续工序。本发明通过依靠桩体与四周土体间的摩擦力外加长条形构件压入土体的反作用力,极大的提高摩擦桩桩基承载力。(The invention relates to a construction process of a rooting enhanced cast-in-place pile, which is added after a cast-in-place pile hole forming procedure or after a steel reinforcement cage is put down, and comprises the following specific steps: a, after a pore-forming process: the method comprises the following steps that (1) strip-shaped components extend outwards from a pile body at different elevation positions of the pile body, then conventional cast-in-place pile construction procedures such as steel reinforcement cage laying, hole clearing and the like are carried out, when cast-in-place pile concrete is poured, steel reinforcements or other connection structures reserved in the direction of the pile body of the strip-shaped components are connected with pile foundation concrete and the steel reinforcement cage into a whole, and finally a cast-in-place pile similar to a wolf tooth rod shape is formed in the stratum; b, after the procedure of putting the reinforcement cage downwards: the steel structure form is utilized, the strip-shaped member is prefabricated, after the reinforcement cage is placed downwards, the steel structure member is placed, and then follow-up procedures such as concrete pouring are carried out. The invention greatly improves the pile foundation bearing capacity of the friction pile by depending on the friction force between the pile body and the surrounding soil body and additionally adding the reaction force of the strip-shaped member pressed into the soil body.)

1. The construction process of the rooting enhanced cast-in-place pile is characterized in that the process is added after a cast-in-place pile hole forming procedure or after a steel reinforcement cage is placed, and the concrete steps are as follows:

a, after a pore-forming process: the method comprises the following steps that (1) strip-shaped components extend outwards from a pile body at different elevation positions of the pile body, then conventional cast-in-place pile construction procedures such as steel reinforcement cage laying, hole clearing and the like are carried out, when cast-in-place pile concrete is poured, steel reinforcements or other connection structures reserved in the direction of the pile body of the strip-shaped components are connected with pile foundation concrete and the steel reinforcement cage into a whole, and finally a cast-in-place pile similar to a wolf tooth rod shape is formed in the stratum;

b, after the procedure of putting the reinforcement cage downwards: the steel structure form is utilized, the strip-shaped member is prefabricated, after the reinforcement cage is placed downwards, the steel structure member is placed, and then follow-up procedures such as concrete pouring are carried out.

2. The rooting-enhanced cast-in-place pile construction process according to claim 1, wherein the cross section of the elongated member is T-shaped, I-shaped, circular or polygonal.

3. The rooting-enhanced cast-in-place pile construction process according to claim 2, wherein one or more layers can be arranged at different heights of the pile body according to calculation, design conditions and the like, and each layer is provided with two or more elongated members along the circumference of the pile body.

4. The rooting-enhanced cast-in-place pile construction process according to claim 3, wherein each layer of elongated members is evenly distributed around the pile body.

5. The rooting-enhanced cast-in-place pile construction process according to claim 4, wherein the elongated member can be pressed into the soil after the hole is formed, or can be pressed into the soil upwards or downwards at a certain angle.

Technical Field

The invention relates to the field of pile foundation construction of cast-in-place piles in civil engineering construction, in particular to a rooting enhanced cast-in-place pile construction process.

Background

The cast-in-place pile is a pile formed by in-situ pore forming and pouring concrete or reinforced concrete. For different geology, the common cast-in-place pile forms are as follows: the pile is formed by vibrating pipe sinking, spirally drilling and grouting.

The piles can be divided into two types of end bearing piles and friction piles according to the stress property:

end bearing pile: the load of the building is transmitted to the hard soil layer or rock stratum through the pile, most of the load on the pile is born by the bearing force of the pile end, and the friction force of the soil around the pile plays a little role.

And (3) friction pile: the load of the building is transferred to the soil around the pile and the soil under the pile end through the pile, most of the load on the pile is supported by the friction force between the pile surface and the soil, and the supporting force of the pile end is small and can be ignored slightly.

The sliding friction of the entity with the soil is much less than the force required for the entity to cut into the soil, given the same volume and without regard to the failure of the body. Therefore, the friction pile is changed from the original sliding friction force between the pile body and the soil body into the sliding friction force between the pile body and the soil body and the cut-in soil body with other structures, and the bearing capacity of the pile foundation is greatly improved.

Disclosure of Invention

The invention aims to solve the problem of small bearing capacity of a pile foundation in the prior art, and provides a rooting enhanced cast-in-place pile construction process.

In order to achieve the purpose, the invention adopts the following technical scheme: a rooting enhanced cast-in-place pile construction process is added after a cast-in-place pile hole forming procedure or after a steel reinforcement cage is placed down, and comprises the following specific steps:

a, after a pore-forming process: the method comprises the following steps that (1) strip-shaped components extend outwards from a pile body at different elevation positions of the pile body, then conventional cast-in-place pile construction procedures such as steel reinforcement cage laying, hole clearing and the like are carried out, when cast-in-place pile concrete is poured, steel reinforcements or other connection structures reserved in the direction of the pile body of the strip-shaped components are connected with pile foundation concrete and the steel reinforcement cage into a whole, and finally a cast-in-place pile similar to a wolf tooth rod shape is formed in the stratum;

b, after the procedure of putting the reinforcement cage downwards: the steel structure form is utilized, the strip-shaped member is prefabricated, after the reinforcement cage is placed downwards, the steel structure member is placed, and then follow-up procedures such as concrete pouring are carried out.

In particular, the elongate member may be T-shaped, i-shaped, circular or polygonal in cross-section.

Particularly, one or more layers can be arranged at different heights of the pile body according to calculation, design conditions and the like, and each layer is provided with two or more long strip-shaped components along the circumference of the pile body.

In particular, the circumference of each layer of the long strip-shaped components is uniformly distributed around the pile body.

Particularly, the strip-shaped member can be horizontally pressed into the soil body after the hole is formed, and can also be pressed into the soil body upwards or downwards at a certain angle.

The invention has the beneficial effects that: the invention greatly improves the pile foundation bearing capacity of the friction pile by depending on the friction force between the pile body and the surrounding soil body and additionally adding the reaction force of the strip-shaped member pressed into the soil body. Under the condition of certain design bearing capacity, the length of the cast-in-place pile can be greatly shortened, the using amount of concrete and steel is reduced, the consumption of engineering on resources such as sand, stone, cement and the like is saved, and the purposes of saving cost, low carbon and environmental protection are achieved.

Drawings

FIG. 1 is a schematic view of a state that a strip-shaped member is pressed into a soil body;

the following detailed description will be made in conjunction with embodiments of the present invention with reference to the accompanying drawings.

Detailed Description

The invention is further illustrated by the following examples in conjunction with the accompanying drawings:

as shown in figure 1, the process is added after the hole forming process of the cast-in-place pile or after a steel reinforcement cage is put down, and the specific steps are as follows:

a, after a pore-forming process: the method comprises the following steps that (1) strip-shaped components extend outwards from a pile body at different elevation positions of the pile body, then conventional cast-in-place pile construction procedures such as steel reinforcement cage laying, hole clearing and the like are carried out, when cast-in-place pile concrete is poured, steel reinforcements or other connection structures reserved in the direction of the pile body of the strip-shaped components are connected with pile foundation concrete and the steel reinforcement cage into a whole, and finally a cast-in-place pile similar to a wolf tooth rod shape is formed in the stratum;

b, after the procedure of putting the reinforcement cage downwards: the steel structure form is utilized, the strip-shaped member is prefabricated, after the reinforcement cage is placed downwards, the steel structure member is placed, and then follow-up procedures such as concrete pouring are carried out.

In particular, the elongate member may be T-shaped, i-shaped, circular or polygonal in cross-section.

Particularly, one or more layers can be arranged at different heights of the pile body according to calculation, design conditions and the like, and each layer is provided with two or more long strip-shaped components along the circumference of the pile body.

In particular, the circumference of each layer of the long strip-shaped components is uniformly distributed around the pile body.

Particularly, the strip-shaped member can be horizontally pressed into the soil body after the hole is formed, and can also be pressed into the soil body upwards or downwards at a certain angle.

Example 1

A construction process of a rooting enhanced cast-in-place pile comprises the following specific steps:

after the hole forming process: the method comprises the following steps that (1) strip-shaped components extend outwards from a pile body at different elevation positions of the pile body, then conventional cast-in-place pile construction procedures such as steel reinforcement cage laying, hole clearing and the like are carried out, when cast-in-place pile concrete is poured, steel reinforcements or other connection structures reserved in the direction of the pile body of the strip-shaped components are connected with pile foundation concrete and the steel reinforcement cage into a whole, and finally a cast-in-place pile similar to a wolf tooth rod shape is formed in the stratum;

particularly, the cross section of the long strip-shaped member can be T-shaped, I-shaped, circular or polygonal, the form with larger bending-resistant section coefficient is preferably adopted, and the form with smaller outside and larger inside is preferably adopted for the longitudinal section.

Particularly, one or more layers can be arranged at different heights of the pile body according to calculation, design conditions and the like, and each layer is provided with two or more long strip-shaped components along the circumference of the pile body.

In particular, the circumference of each layer of the long strip-shaped components is uniformly distributed around the pile body.

Particularly, the strip-shaped member can be horizontally pressed into the soil body after the hole is formed, and can also be pressed into the soil body upwards or downwards at a certain angle.

In particular, the strip-shaped member can be a prefabricated reinforced concrete structure, a steel structure or other high-strength materials, mainly aims at bearing shearing force and bending moment applied when cutting into a soil body, and has certain corrosion resistance. The soil body cutting comprises downward cutting and upward cutting, and the soil body cutting can be used as a bearing pile and an uplift pile.

After the hole is formed by the traditional process, the device containing the strip-shaped component is placed into the hole at a specific height after being leveled by utilizing leveling equipment. After the device is placed to a specified elevation, the device is started, the strip-shaped member is pressed into the soil body in a hydraulic mode, a mechanical mode and other power modes, and the angle of the strip-shaped member can be adjusted according to the requirement. The pre-cut rebar or other structure at the tail of the elongated member remains in the hole. And then carrying out traditional cast-in-place pile construction steps of hole cleaning, steel reinforcement cage lowering, → secondary hole cleaning … … and the like. Finally, the elongated member and the cast-in-place pile form a whole, and a cast-in-place pile similar to a wolf tooth rod is formed in the stratum.

Example 2

A construction process of a rooting enhanced cast-in-place pile comprises the following specific steps:

after the procedure of lowering the steel reinforcement cage: the steel structure form is utilized, the strip-shaped member is prefabricated, after the reinforcement cage is placed downwards, the steel structure member is placed, and then follow-up procedures such as concrete pouring are carried out.

Particularly, the cross section of the long strip-shaped member can be T-shaped, I-shaped, circular or polygonal, the form with larger bending-resistant section coefficient is preferably adopted, and the form with smaller outside and larger inside is preferably adopted for the longitudinal section.

Particularly, one or more layers can be arranged at different heights of the pile body according to calculation, design conditions and the like, and each layer is provided with two or more long strip-shaped components along the circumference of the pile body.

In particular, the circumference of each layer of the long strip-shaped components is uniformly distributed around the pile body.

Particularly, the strip-shaped member can be horizontally pressed into the soil body after the hole is formed, and can also be pressed into the soil body upwards or downwards at a certain angle.

In particular, the strip-shaped member can be a prefabricated reinforced concrete structure, a steel structure or other high-strength materials, mainly aims at bearing shearing force and bending moment applied when cutting into a soil body, and has certain corrosion resistance. The soil body cutting comprises downward cutting and upward cutting, and the soil body cutting can be used as a bearing pile and an uplift pile.

After the steel reinforcement cage is placed through the traditional process, the prefabricated steel structure strip-shaped component is installed to the position with a specific height in the hole, and the prefabricated steel structure strip-shaped component is pressed into the soil body through power modes such as pressing and machinery. And then carrying out traditional cast-in-place pile construction steps of 'secondary hole cleaning' → 'concrete pouring' … … and the like. Finally, the prefabricated steel structure strip-shaped component and the cast-in-place pile form a whole, and the cast-in-place pile similar to a wolf tooth rod is formed in the stratum.

The invention greatly improves the pile foundation bearing capacity of the friction pile by depending on the friction force between the pile body and the surrounding soil body and additionally adding the reaction force of the strip-shaped member pressed into the soil body. Under the condition of certain design bearing capacity, the length of the cast-in-place pile can be greatly shortened, the using amount of concrete and steel is reduced, the consumption of engineering on resources such as sand, stone, cement and the like is saved, and the purposes of saving cost, low carbon and environmental protection are achieved.

The invention has been described in connection with the accompanying drawings, it is to be understood that the invention is not limited to the specific embodiments disclosed, but is intended to cover various modifications, adaptations or uses of the invention, and all such modifications and variations are within the scope of the invention.