阅读说明：本技术 纤维高韧性水泥土复合桩的施工方法 (Construction method of fiber high-toughness cement soil composite pile ) 是由 沙焕焕 邓亚光 于 2019-10-16 设计创作，主要内容包括：本发明公开了一种纤维高韧性水泥土复合桩的施工方法,(1)先在土中打入砂石桩、排水板或排水带,且砂石桩或排水板中混合有水溶性包装袋包装的纤维材料；(2)排水完成后再在同一位置进行水泥土桩或水泥砂土桩的搅拌施工,水溶性包装袋遇地下水或水泥浆软化,所述纤维材料被搅拌到水泥土或水泥砂土中；(3)在水泥未硬凝时再在同一位置打入预制芯桩,芯桩截面小于水泥土桩或水泥砂土桩截面,打入的芯桩挤密、挤扩了外围的纤维水泥土或水泥砂土,芯桩与外围桩共同构成了纤维高韧性水泥土复合桩。本发明施工方便,复合桩的外围桩韧性高、强度大、抗弯抗折抗裂性能好,桩身抗水平力高。(The invention discloses a construction method of a fiber high-toughness cement soil composite pile, which comprises the following steps of (1) driving a sand-gravel pile, a drainage plate or a drainage belt into soil, wherein a fiber material packaged by a water-soluble packaging bag is mixed in the sand-gravel pile or the drainage plate; (2) after the drainage is finished, stirring construction of a cement soil pile or a cement sand soil pile is carried out at the same position, the water-soluble packaging bag is softened when meeting underground water or cement paste, and the fiber material is stirred into cement soil or cement sand soil; (3) when cement is not hardened, a prefabricated core pile is driven into the same position, the section of the core pile is smaller than that of the cement-soil pile or the cement-sand-soil pile, the driven core pile is compacted and expands peripheral fiber cement soil or cement-sand soil, and the core pile and the peripheral pile jointly form the fiber high-toughness cement-soil composite pile. The invention has the advantages of convenient construction, high toughness, high strength, good bending resistance, breaking resistance and cracking resistance of the peripheral pile of the composite pile and high horizontal resistance of the pile body.)

1. A construction method of a fiber high-toughness cement soil composite pile is characterized by comprising the following steps: comprises the following steps:

(1) firstly, driving a sand-stone pile, a drainage plate or a drainage belt into soil, and mixing a fiber material packaged by a water-soluble packaging bag into the sand-stone pile or the drainage plate;

(2) the gravel pile, the drainage plate or the drainage belt is used as a drainage channel to drain most of underground water, stirring construction of a cement-soil pile or a cement-sand-soil pile is carried out at the same position after drainage is finished, the water-soluble packaging bag is softened when meeting the underground water or cement paste, and the fiber material is stirred into the cement soil or the cement-sand soil;

(3) when cement is not hardened, a prefabricated core pile is driven into the same position, the section of the core pile is smaller than that of the cement-soil pile or the cement-sand-soil pile, the driven core pile is compacted and expands peripheral fiber cement soil or cement-sand soil, and the core pile and the peripheral pile jointly form the fiber high-toughness cement-soil composite pile.

2. The construction method of the fiber high-toughness cement-soil composite pile according to claim 1, characterized in that: the sand-stone pile is firstly driven into the soil by a vibrating pipe sinking method or a long spiral soil taking and recharging method, and the drain plate or the drain belt is driven into the soil by a hammering method.

3. The construction method of the fiber high-toughness cement-soil composite pile according to claim 1, characterized in that: the stirring construction of the cement soil pile or the cement sand soil pile refers to that a cement stirring pile machine is adopted to spray cement powder or cement paste while stirring, and one or more times of drilling and lifting are carried out; when the ground water content is high, the cement powder is sprayed, and when the ground water content is low, the cement slurry is sprayed.

4. The construction method of the fiber high-toughness cement-soil composite pile according to claim 1, characterized in that: the water-soluble packaging bag is manufactured by adopting a water-soluble high polymer material as a film forming substrate, adding a plasticizer, a softening agent, a surfactant and a dispersant auxiliary material and adopting a film forming process.

5. The construction method of the fiber high-toughness cement-soil composite pile according to claim 1, characterized in that: the fiber material is one or more of metal fiber, natural mineral fiber, artificial mineral fiber, synthetic fiber and plant fiber.

6. The method for constructing a fiber high-toughness cement-soil composite pile according to claim 1 or 3, wherein: and (3) spraying air at high pressure to discharge the underground water out of the ground while spraying the cement powder and stirring in the step (2).

Technical Field

The invention relates to a construction method of a fiber high-toughness cement soil composite pile.

Background

The existing cement-soil composite pile construction is generally carried out by adopting common cement and a stirring method, the constructed cement-soil pile has low tensile strength, small ultimate elongation and brittle property, and the defects are not obvious when the cement-soil composite pile is used as a compression-resistant pile, but the material performance is insufficient when the cement-soil composite pile is used as an uplift pile or a support pile, and further improvement is needed.

Disclosure of Invention

The invention aims to provide a construction method of a fiber high-toughness cement soil composite pile with convenient construction and good bending resistance, fracture resistance and crack resistance.

The technical solution of the invention is as follows:

a construction method of a fiber high-toughness cement soil composite pile is characterized by comprising the following steps: comprises the following steps:

(1) firstly, driving a sand-stone pile, a drainage plate or a drainage belt into soil, and mixing a fiber material packaged by a water-soluble packaging bag into the sand-stone pile or the drainage plate;

(2) the gravel pile, the drainage plate or the drainage belt is used as a drainage channel to drain most of underground water, stirring construction of a cement-soil pile or a cement-sand-soil pile is carried out at the same position after drainage is finished, the water-soluble packaging bag is softened when meeting the underground water or cement paste, and the fiber material is stirred into the cement soil or the cement-sand soil;

(3) when cement is not hardened, a prefabricated core pile is driven into the same position, the section of the core pile is smaller than that of the cement-soil pile or the cement-sand-soil pile, the driven core pile is compacted and expands peripheral fiber cement soil or cement-sand soil, and the core pile and the peripheral pile jointly form the fiber high-toughness cement-soil composite pile.

The sand-stone pile is firstly driven into the soil by a vibrating pipe sinking method or a long spiral soil taking and recharging method, and the drain plate or the drain belt is driven into the soil by a hammering method.

The stirring construction of the cement soil pile or the cement sand soil pile refers to that a cement stirring pile machine is adopted to spray cement powder or cement paste while stirring, and one or more times of drilling and lifting are carried out; when the ground water content is high, the cement powder is sprayed, and when the ground water content is low, the cement slurry is sprayed.

The water-soluble packaging bag is manufactured by adopting a water-soluble high polymer material as a film forming substrate, adding a plasticizer, a softening agent, a surfactant and a dispersant auxiliary material and adopting a film forming process.

The fiber material is one or more of metal fiber, natural mineral fiber, artificial mineral fiber, synthetic fiber and plant fiber.

And (3) spraying air at high pressure to discharge the underground water out of the ground while spraying the cement powder and stirring in the step (2).

The invention has the advantages of convenient construction, high toughness, high strength, good bending resistance, breaking resistance and cracking resistance of the peripheral pile of the composite pile and high horizontal resistance of the pile body.

The present invention will be further described with reference to the following examples.

Detailed Description

A construction method of a fiber high-toughness cement soil composite pile comprises the following steps:

(1) the water-soluble polymer material is used as a film forming substrate, a plasticizer, a softening agent, a surfactant and a dispersing agent auxiliary material are added, a water-soluble packaging bag is manufactured through a film forming process, basalt fiber is filled in the packaging bag, and the basalt fiber is continuous fiber drawn from natural basalt and belongs to natural mineral fiber. Firstly, driving sand, stones and the packaging bags into soil by using a vibrating pipe-sinking pile driver;

(2) discharging most of underground water through a gravel pile drainage channel, spraying cement powder while stirring at the same position by using a cement stirring pile machine after the drainage is finished, drilling down and lifting twice, simultaneously spraying air at high pressure to discharge the underground water out of the ground, softening a water-soluble packaging bag when meeting the underground water, and stirring basalt fibers into cement sandy soil;

(3) when the cement is not hardened, the prefabricated core pile is driven into the same position, the section of the core pile is smaller than that of the cement sand soil pile, the driven core pile is compacted and expands the peripheral fiber cement sand soil, and the core pile and the peripheral pile jointly form the fiber high-toughness cement soil composite pile.