Rotary drilling cast-in-place pile and construction process thereof

文档序号：1857378 发布日期：2021-11-19 浏览：33次中文

阅读说明：本技术 一种旋挖钻孔灌注桩及其施工工艺 (Rotary drilling cast-in-place pile and construction process thereof ) 是由王佳孟凡东孟彬陈建松于 2021-08-23 设计创作，主要内容包括：本发明涉及灌注桩施工领域,具体公开了一种旋挖钻孔灌注桩及其施工工艺。旋挖钻孔灌注桩的施工工艺,包括：步骤1),在施工处埋设护筒；步骤2),通过泥浆护壁进行旋挖钻孔,形成桩孔；步骤3),对桩孔进行清孔；步骤4),桩孔内放入补强管并沉入钢筋笼,补强管由玻璃纤维网制成,补强管的外径为桩孔内径的99.5-99.8%；步骤5),安装注浆管并在桩孔内注入混凝土拌和料至与桩孔顶部平齐；步骤6),拆卸护筒与注浆管；步骤7),再次向桩孔内注入混凝土拌和料至与桩孔顶部平齐,养护得旋挖钻孔灌注桩。旋挖钻孔灌注桩,由旋挖钻孔灌注桩的施工工艺制成。本发明的施工工艺具有减少材料的浪费的优点,本发明的旋挖钻孔灌注桩具有节能环保的优点。(The invention relates to the field of cast-in-place pile construction, and particularly discloses a rotary drilling cast-in-place pile and a construction process thereof. The construction process of the rotary drilling bored concrete pile comprises the following steps: step 1), embedding a pile casing at a construction position; step 2), carrying out rotary drilling through the slurry retaining wall to form a pile hole; step 3), cleaning the pile hole; step 4), placing a reinforcing pipe into the pile hole and sinking a reinforcement cage, wherein the reinforcing pipe is made of glass fiber mesh, and the outer diameter of the reinforcing pipe is 99.5-99.8% of the inner diameter of the pile hole; step 5), installing a grouting pipe and injecting concrete mixture into the pile hole until the concrete mixture is flush with the top of the pile hole; step 6), disassembling the protective sleeve and the grouting pipe; and 7) injecting concrete mixture into the pile hole again until the concrete mixture is flush with the top of the pile hole, and curing to obtain the rotary drilling cast-in-place pile. The rotary drilling bored concrete pile is manufactured by the construction process of the rotary drilling bored concrete pile. The construction process has the advantage of reducing material waste, and the rotary drilling bored concrete pile has the advantages of energy conservation and environmental protection.)

1. The construction process of the rotary drilling cast-in-place pile is characterized by comprising the following steps of: the method comprises the following steps:

step 1), embedding a pile casing at a construction position;

step 2), carrying out rotary drilling through the slurry retaining wall to form a pile hole;

step 3), cleaning the pile hole;

step 4), placing a reinforcing pipe into the pile hole and sinking a reinforcement cage, wherein the reinforcing pipe is made of glass fiber mesh, and the outer diameter of the reinforcing pipe is 99.5-99.8% of the inner diameter of the pile hole;

step 5), installing a grouting pipe and injecting concrete mixture into the pile hole until the concrete mixture is flush with the top of the pile hole;

step 6), disassembling the protective sleeve and the grouting pipe;

and 7) injecting concrete mixture into the pile hole again until the concrete mixture is flush with the top of the pile hole, and curing to obtain the rotary drilling cast-in-place pile.

2. The construction process of the rotary drilling bored concrete pile according to claim 1, characterized in that: in the step 4), the aperture of the mesh of the reinforcing pipe is 8-10 mm.

3. The construction process of the rotary drilling bored concrete pile according to claim 2, characterized in that: in the step 4), the length of the reinforcing pipe is 90-95% of the depth of the pile hole.

4. The construction process of the rotary drilling bored concrete pile according to claim 1, characterized in that: in the step 2), the specific gravity of the wall protection slurry is controlled to be 1.3-1.4.

5. The construction process of the rotary drilling bored concrete pile according to any one of claims 1 to 4, characterized in that: the concrete mixture comprises the following components in parts by weight:

100 parts of water;

350 portions and 352 portions of cement;

34-36 parts of fly ash;

455-460 parts of sand;

775 and 780 parts;

3.3-3.6 parts of sodium chromate;

1.1-1.2 parts of sodium stannate.

6. The construction process of the rotary drilling bored concrete pile according to claim 5, characterized in that: the concrete mixture also comprises the following components in parts by weight:

10-11 parts of silicon micropowder.

7. The construction process of the rotary drilling bored concrete pile according to claim 6, characterized in that: the concrete mixture also comprises the following components in parts by weight:

3-5 parts of carbon fiber.

8. The utility model provides a dig bored concrete pile soon which characterized in that: the construction process of the rotary excavating drilling cast-in-place pile is manufactured according to any one of claims 1 to 7.

Technical Field

The invention relates to the field of cast-in-place pile construction, in particular to a rotary drilling cast-in-place pile and a construction process thereof.

Background

Along with social progress, buildings are more and more, the scale of the buildings is larger and larger, in order to guarantee the stability of the buildings, a foundation pile foundation is a very critical ring, the pile foundation is provided with a plurality of construction methods, the number of required workers is small due to the fact that the rotary drilling cast-in-place pile is operated mechanically, a large amount of labor cost can be saved, and therefore more and more projects adopt the rotary drilling cast-in-place pile to construct the pile foundation.

When the rotary drilling bored concrete pile is constructed, firstly, a pile hole needs to be constructed through equipment, then a reinforcement cage is sunk into the pile hole, then concrete is poured into the pile hole, and maintenance is carried out to form the rotary drilling bored concrete pile.

Disclosure of Invention

In order to reduce the waste of materials, the application provides a rotary drilling bored concrete pile and a construction process thereof.

In a first aspect, the application provides a construction process for a rotary drilling cast-in-place pile, which adopts the following technical scheme:

a construction process of a rotary drilling bored concrete pile comprises the following steps:

step 1), embedding a pile casing at a construction position;

step 2), carrying out rotary drilling through the slurry retaining wall to form a pile hole;

step 3), cleaning the pile hole;

step 5), installing a grouting pipe and injecting concrete mixture into the pile hole until the concrete mixture is flush with the top of the pile hole;

step 6), disassembling the protective sleeve and the grouting pipe;

and 7) injecting concrete mixture into the pile hole again until the concrete mixture is flush with the top of the pile hole, and curing to obtain the rotary drilling cast-in-place pile.

By adopting the technical scheme, the reinforcing pipe made of the glass fiber net is placed in the pile hole after hole cleaning, and the outer diameter of the reinforcing pipe is 99.5-99.8% of the inner diameter of the pile hole, so that the reinforcing pipe is close to the outer edge of the rotary drilling bored pile, the outer edge of the rotary drilling bored pile is reinforced, the inner part of the rotary drilling bored pile is reinforced by matching with a reinforcement cage, so that the inner part and the outer part of the rotary drilling bored pile have stronger tensile force reinforcing effects, the rotary drilling bored pile is not easy to break when stressed, the anti-cracking performance is obviously improved, the rotary drilling bored pile can reduce the condition of improving the structural stability by increasing the size, the rotary drilling bored pile can adopt smaller size and less pile number under the same bearing requirement, and the effect of reducing material waste can be realized.

Preferably, in the step 4), the aperture of the mesh of the reinforcing pipe is 8-10 mm.

By adopting the technical scheme, the reinforcing pipe is provided with the specific mesh aperture, so that the coarse aggregate in the concrete mixture can not pass through the reinforcing pipe, the reinforcing pipe is completely unfolded by the pressure of the coarse aggregate, the wrinkle phenomenon is not easy to occur, the glass fiber of the reinforcing pipe is better in a stretching state, the glass fiber is not required to be greatly deformed when being stressed, the glass fiber can be stressed more quickly to resist the tensile stress under the action of external force, the effect of the tensile stress provided by the reinforcing pipe is better, the fine aggregate can partially pass through the reinforcing net through the specific mesh aperture, so that the surface of the rotary drilling cast-in-place pile is tightly attached to the wall of the pile hole, the attaching part has better strength, and the fine aggregate can be embedded into the soil under the action of the pressure, so that the friction force between the rotary drilling cast-in-place pile and the hole wall is stronger, the adhesive force is larger, and the stability of the rotary drilling cast-in-place pile is higher, the pile foundation quality is better.

Preferably, in the step 4), the length of the reinforcing pipe is 90% -95% of the depth of the pile hole.

Through adopting above-mentioned technical scheme, through the length of restriction reinforcement pipe, guarantee that the reinforcement pipe reinforcement is dug the drilling bored concrete pile soon the scope enough big to make the whole root dig the drilling bored concrete pile soon all have stronger anti-crack performance, difficult fracture, the quality preferred.

Preferably, in the step 2), the specific gravity of the wall protection slurry is controlled to be 1.3-1.4.

By adopting the technical scheme, the pile hole stability is higher by controlling the mud proportion, the hole collapse phenomenon is not easy to occur, the construction is smooth, the engineering difficulty is reduced, and the construction quality is improved.

Preferably, the concrete mixture comprises the following components in parts by weight:

100 parts of water;

350 portions and 352 portions of cement;

34-36 parts of fly ash;

455-460 parts of sand;

775 and 780 parts;

3.3-3.6 parts of sodium chromate;

1.1-1.2 parts of sodium stannate.

By adopting the technical scheme, ammonium chromate and sodium stannate are added into concrete mixture, so that the manufactured rotary drilling bored concrete pile has stronger compressive property and cracking resistance, the bearing capacity of the rotary drilling bored concrete pile is stronger, the structure is more stable, the required size of the rotary drilling bored concrete pile is smaller under the same strength requirement, the material consumption is reduced, and the rotary drilling bored concrete pile is energy-saving and environment-friendly.

In addition, due to the existence of the chromate and the stannic acid radical, calcium hydroxide is not easy to enrich at the interface between the set cement and the aggregate, but is easy to mix and dope with the set cement, the situation of forming a weak spot between the set cement and the aggregate is reduced, and the set cement and the aggregate are not easy to strip, thereby showing that the prepared concrete has stronger crack resistance.

Preferably, the concrete mixture further comprises the following components in parts by weight:

10-11 parts of silicon micropowder.

By adopting the technical scheme, the silicon powder is added to fill the gaps of the concrete, so that the concrete is more compact, the rotary drilling bored concrete pile has stronger seepage-proofing capability, the corrosion of underground moisture to the rotary drilling bored concrete pile is reduced, and the rotary drilling bored concrete pile is longer in service life and safer.

Preferably, the concrete mixture further comprises the following components in parts by weight:

3-5 parts of carbon fiber.

By adopting the technical scheme, the anti-cracking performance of the concrete is further improved by adding the carbon fibers, so that the manufactured rotary drilling bored concrete pile is less prone to fracture, better in quality and better in safety.

In a second aspect, the present application provides a rotary drilling bored concrete pile, which adopts the following technical scheme:

a rotary drilling bored concrete pile is manufactured by the construction process of the rotary drilling bored concrete pile.

By adopting the technical scheme, the manufactured rotary drilling cast-in-place pile has stronger compression resistance and crack resistance, can relatively reduce the size of the rotary drilling cast-in-place pile under the same engineering requirement, reduces the material consumption, and is energy-saving and environment-friendly.

In summary, the present application has the following beneficial effects:

1. according to the method, the reinforcing pipe made of the glass fiber net is placed in the pile hole after hole cleaning, the outer diameter of the reinforcing pipe is 99.5-99.8% of the inner diameter of the pile hole, the reinforcing pipe is close to the outer edge of the rotary drilling bored pile, the outer edge of the rotary drilling bored pile is reinforced, the inner portion of the rotary drilling bored pile is reinforced through matching with a steel reinforcement cage, the inner portion and the outer portion of the rotary drilling bored pile have stronger tensile force reinforcing effects, the rotary drilling bored pile is not prone to breaking when stressed, the anti-cracking performance is remarkably improved, the rotary drilling bored pile can be reduced by increasing the size so as to improve the structural stability, the rotary drilling bored pile can adopt smaller size and fewer piles under the same bearing requirement, and the effect of reducing material waste can be achieved.

2. In the application, the reinforcing pipe is preferably provided with a specific mesh aperture, so that coarse aggregate in concrete mixture can not pass through the reinforcing pipe, the reinforcing pipe is completely unfolded by the pressure of the coarse aggregate, the wrinkle phenomenon is not easy to occur, the glass fiber of the reinforcing pipe is better in a stretching state, a large amount of deformation is not needed when the glass fiber is stressed, the glass fiber can be stressed quickly to resist tensile stress under the action of external force, the effect of tensile stress provided by the reinforcing pipe is better, fine aggregate can partially pass through the reinforcing net through the specific mesh aperture, the surface of the rotary drilling cast-in-place pile is tightly attached to the wall of a pile hole, the attaching part has better strength, and the fine aggregate can be embedded into soil under the action of pressure, so that the friction force between the rotary drilling cast-in-place pile and the hole wall is stronger, the adhesive force is larger, and the stability of the rotary drilling cast-in-place pile is higher, the pile foundation quality is better.

3. Preferentially in this application through add ammonium chromate and sodium stannate in concrete mixture for the drilling bored concrete pile soon that makes has stronger compressive property and anti fracture performance, makes to dig the drilling bored concrete pile bearing capacity soon stronger, and the structure is more stable, and under the same intensity requirement, it is littleer to dig the required size of drilling bored concrete pile soon, reduces material consumption, energy-concerving and environment-protective.

Detailed Description

The present application will be described in further detail with reference to examples.

The information on the source of the raw materials used in the following preparations, comparative preparations and examples is shown in Table 1.

TABLE 1

Raw materials	Source information
		Cement	Superfine Portland cement 42.5, a new type of Shandong Tegu building materials Co., Ltd
Fly ash	Lingshou county Ningbo mineral products Co., Ltd, first grade fly ash
		Sand	Hebei Baoding engineering construction Co., Ltd, river sand, average particle size 6mm
Stone (stone)	Yaotai mineral products Ltd, Lingshu county, gravel, average particle diameter 12mm
		Sodium chromate	Wuhan Fuxin Yuanjin Tech Co Ltd, content 99%
Sodium stannate	Jinan Hui Jinchuan chemical company Limited, content 98%
		Silicon micropowder	800 mesh flying mineral processing factory in Lingshou county
Carbon fiber	Dongguan City oil antistatic plastic technology company, 5mm in length

Preparation examples 1 to 3

A concrete mix comprising the following components:

water, cement, fly ash, sand, stone, sodium chromate and sodium stannate.

The specific amounts (in kg) of the individual components used in preparation examples 1 to 3 are specified in Table 2.

TABLE 2

	Preparation example 1	Preparation example 2	Preparation example 3
				Water (W)	100	100	100
Cement	350	352	351
				Fly ash	34	36	35
Sand	455	460	458
				Stone (stone)	775	780	778
Sodium chromate	3.3	3.6	3.5
				Sodium stannate	1.1	1.2	1.18

In preparation examples 1 to 3, the concrete mixture was prepared as follows:

putting water, cement, fly ash, sodium chromate and sodium stannate into a stirring kettle, stirring for 5min at the rotating speed of 120r/min, then putting sand and stone at the rotating speed of 80r/min, and stirring for 15min to obtain the concrete mixture.

Preparation examples 4 to 6

A concrete mixture differs from preparation example 3 only in that:

also comprises silicon micropowder.

In preparation examples 4 to 6, the specific amount (in kg) of the fine silica powder to be charged is shown in Table 3.

TABLE 3

	Preparation example 4	Preparation example 5	Preparation example 6
				Silicon micropowder	10	11	10.5

In preparation examples 4 to 6, the fine silica powder was put into a stirred tank together with sand and stone and mixed uniformly.

Preparation examples 7 to 9

A concrete mixture differs from preparation 6 only in that:

also included are carbon fibers.

In preparation examples 7 to 9, the specific amount (in kg) of the fine silica powder to be charged is shown in Table 4.

TABLE 4

	Preparation example 7	Preparation example 8	Preparation example 9
				Carbon fiber	3	5	4

In preparation examples 7 to 9, carbon fibers were put into a stirring vessel together with sand, stone, and fine silica powder and mixed uniformly.

Comparative preparation example 1