阅读说明：本技术 一种静压沉桩结构的施工装置及其安装方法 (Construction device of static pressure pile sinking structure and installation method thereof ) 是由 何剑锋 曹庆碧 杨波 李磊 朱荣其 *** 于 2020-07-02 设计创作，主要内容包括：本发明公开了一种静压沉桩结构的施工装置及其安装方法,解决了现有的灌注桩由于桩径大以及入土时竖直度不好对地形的挤压变形大,且护筒拆除之后使得混凝土与周边土层的结合力较差的问题,本发明包括静压装置和护筒,所述静压装置用于将护筒压入土层中并且上提所述护筒,所述护筒的外侧壁设置多个内凹部,所述内凹部贯穿所述护筒,所述内凹部朝护筒的外侧壁开口,所述内凹部中设置有注浆管,所述护筒的底部设置有桩靴。本发明实施的静压桩具有减小土层挤压变形,桩体与土层的结合力好等优点。(The invention discloses a construction device of a static pressure pile sinking structure and an installation method thereof, and solves the problems that the existing cast-in-place pile has large pile diameter and bad verticality when entering the soil and has large extrusion deformation to the terrain, and the bonding force between concrete and the peripheral soil layer is poor after a pile casing is removed. The static pressure pile has the advantages of reducing extrusion deformation of the soil layer, having good binding force between the pile body and the soil layer and the like.)

1. The construction device of the static pressure pile sinking structure is characterized by comprising a static pressure device and a pile casing (1), wherein the static pressure device is used for pressing the pile casing (1) into a soil layer and lifting the pile casing (1), a plurality of concave parts (2) are arranged on the outer side wall of the pile casing (1), the concave parts (2) penetrate through the pile casing (1), a grouting pipe (3) is arranged in the concave parts (2), and pile shoes (4) are arranged at the bottom of the pile casing (1).

2. The construction equipment of a static pressure pile sinking structure according to claim 1, wherein the inner concave portion (2) is formed in a circular arc shape, and the size of the inner concave portion (2) in the radial direction of the casing (1) is larger than the diameter of the grouting pipe (3).

3. A static pressure pile driving structure construction apparatus as claimed in claim 1 or 2, wherein the tip of the inner recess (2) is lower than the tip of the casing (1), and the inner recess (2) forms a step (5) inside the casing (1).

4. The construction device of a static pressure pile sinking structure according to claim 3, wherein the static pressure device comprises a bracket (6), a hydraulic cylinder and a holding device, the hydraulic cylinder is connected with the holding device, the hydraulic cylinder comprises a first hydraulic cylinder (7) and a second hydraulic cylinder (8), the holding device comprises a hoop (9) and a pressing plate (10), the hoop (9) is connected with the first hydraulic cylinder (7), the pressing plate (10) is connected with the second hydraulic cylinder (8), when the pile casing (1) is pressed down, the pressing plate (10) is abutted against the step (5) of the pile casing (1), the diameter of the pressing plate (10) is larger than that of the inscribed circle of the inner concave part (2) and smaller than that of the pile casing (1), and the hoop (9) is connected with the side wall of the pile casing (1).

5. A construction apparatus for a static pressure pile sinking structure according to any one of claims 1, 2 or 4, wherein the number of the first hydraulic cylinder (7) and the second hydraulic cylinder (8) is three, and the first hydraulic cylinder (7) and the second hydraulic cylinder (8) are arranged at intervals.

6. A construction apparatus for a static pile driving structure according to any one of claims 1, 2 or 4, further comprising an inner pipe for pressing the concrete in the casing (1).

7. A method of installing a construction apparatus for a static pressure pile-sinking structure, characterized in that the construction apparatus for a static pressure pile-sinking structure as claimed in any one of claims 1 to 6 is installed, comprising the steps of:

step 1: the method comprises the following steps that (1) a pile casing (1) is installed on a hoop (9), a second hydraulic cylinder (8) is adjusted to enable a pressing plate (10) to abut against a step (5) of the pile casing (1), and the pile casing (1) is pressed down to a preset position;

step 2: -inserting a grouting pipe (3) into the inner recess (2);

and step 3: loosening the pile casing (1), moving the anchor ear (9) and the pressing plate (10) upwards, putting a reinforcement cage into the pile casing (1), lifting the pile casing (1) upwards while pouring concrete, and simultaneously pouring elastic concrete into the grouting pipe (3);

and 4, step 4: and after grouting, vibrating the concrete by using a vibrating device to form the pile.

8. The method for installing a construction apparatus for a static pressure pile sinking structure according to claim 7, wherein the rising speed of the elastic concrete is greater than the rising speed of the casing (1) when the grout pipes (3) are grouted in the step 3.

9. The method for installing a construction apparatus for a static pressure driven pile sinking structure as claimed in claim 7 or 8, wherein in the step 3, before the reinforcement cage is inserted, the inner cylinder (11) is installed on the anchor ear (9), concrete is injected into the casing (1), and the inner cylinder (11) is pressed down so that the inner cylinder (11) presses the concrete.

Technical Field

The invention relates to the technical field of static pressure piles, in particular to a construction device of a static pressure pile sinking structure and an installation method thereof.

Background

The static pressure pile is a pile sinking process for pressing a prefabricated pile into the soil by a pile pressing mechanism of a static pressure pile press through the self weight of the pile pressing machine and the counter weight on a frame, the types of the static pressure pile are more, such as a miniature steel pipe pile, a cast-in-place pile and the like, wherein, the miniature steel pipe pile is suitable for flat areas or soft soil terrains because of small pile diameter, but the miniature steel pipe pile often cannot meet the design requirements for terrains with hard soil or uneven soil, but the cast-in-place pile technology is more advantageous, however, the cast-in-place pile has the defects that the pile is large, the extrusion to the peripheral terrain is large, the soil layer around the pile is large in deformation, the inclination of the peripheral pile foundation is easy to cause, particularly in the process of entering the soil layer, under the condition of poor verticality, the influence on peripheral soil layers and pile foundations is larger, and the combination of concrete and peripheral soil is improved mainly by adopting vibration after the pile casing is lifted by the conventional cast-in-place pile, so that the binding force is poorer.

For this reason, there is a need for an improved cast-in-place pile.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the existing cast-in-place pile has large pile diameter and large extrusion deformation to the terrain due to poor verticality when entering the soil, and the binding force between concrete and a peripheral soil layer is poor after the pile casing is dismantled.

The invention is realized by the following technical scheme:

the construction device of the static pressure pile sinking structure comprises a static pressure device and a pile casing, wherein the static pressure device is used for pressing the pile casing into a soil layer and lifting the pile casing, a plurality of concave parts are arranged on the outer side wall of the pile casing and penetrate through the pile casing, the concave parts open towards the outer side wall of the pile casing, a grouting pipe is arranged in each concave part, and a pile shoe is arranged at the bottom of the pile casing.

The design principle of the invention is as follows: to protect and set up interior recess on the section of thick bamboo, the bottom sets up the pile shoe, the setting up of pile shoe can help protecting a section of thick bamboo and get into the stake ground better, the pile shoe drives the section of thick bamboo that protects and gets into the soil layer and makes the section of thick bamboo produce the extrusion to peripheral soil layer, after getting into the soil layer, open-ended interior recess can not extrude the soil layer, thereby can make the soil layer suitably resume deformation, reduce deformation, and after protecting a section of thick bamboo and entering into predetermined soil layer degree of depth, insert the slip casting pipe and carry out the slip casting, also carry out concrete placement in protecting a section of thick bamboo, thereby make the section of thick bamboo periphery of protecting have concrete and soil layer to combine, concrete in protecting a section of thick bamboo is when promoting protecting a section of thick bamboo, the concrete flows gradually and meets with the outer concrete of protecting a section of thick bamboo, make.

According to the construction device of the static pressure pile sinking structure, the inner concave part is in an arc shape, and the size of the inner concave part along the radial direction of the pile casing is larger than the diameter of the grouting pipe, so that the grouting pipe can be inserted conveniently for grouting operation.

The construction device of the static pressure pile sinking structure is preferable, the top end of the concave part is lower than the top end of the pile casing, and the concave part forms a step in the pile casing.

The invention preferably discloses a construction device of a static pressure pile sinking structure, wherein the static pressure device comprises a support, a hydraulic cylinder and a holding and pressing device, the hydraulic cylinder is connected with the holding and pressing device, the hydraulic cylinder comprises a first hydraulic cylinder and a second hydraulic cylinder, the holding and pressing device comprises a hoop and a pressing plate, the hoop is connected with the first hydraulic cylinder, the pressing plate is connected with the second hydraulic cylinder, when a pile casing is pressed down, the pressing plate props against the step of the pile casing, the diameter of the pressing plate is larger than the diameter of an inscribed circle of the concave part and smaller than the diameter of the pile casing, and the hoop is connected with the side wall of the pile casing.

The construction device of the static pressure pile sinking structure is preferably provided with three first hydraulic cylinders and three second hydraulic cylinders, and the first hydraulic cylinders and the second hydraulic cylinders are arranged at intervals.

According to the invention, the vertical fixation of the protective cylinder is realized in a manner of combining the holding and the jacking, on one hand, the holding hoop holds the outer wall of the protective cylinder, on the other hand, the pressing plate supports against the step, and in the process of pressing down the protective cylinder, the first hydraulic cylinder applies force to the holding hoop and the second hydraulic cylinder applies force to the pressing plate simultaneously and downwards to the protective cylinder, so that the verticality of the protective cylinder can be better maintained.

The invention preferably discloses a construction device of a static pressure pile sinking structure, and further comprises an inner pipe, wherein the inner pipe is used for extruding concrete in the pile casing.

An installation method of a construction device of a static pressure pile sinking structure comprises the following steps:

step 1: installing a protective cylinder on the hoop, adjusting a second hydraulic cylinder to enable a pressure plate to abut against the step of the protective cylinder, and pressing the protective cylinder down to a preset position;

step 2: inserting a grout tube into the interior recess;

and step 3: loosening the protective cylinder, moving the anchor ear and the pressing plate upwards, putting a reinforcement cage into the protective cylinder, lifting the protective cylinder upwards while pouring concrete, and simultaneously pouring elastic concrete into the grouting pipe;

and 4, step 4: and after grouting, vibrating the concrete by using a vibrating device to form the pile.

When the pile casing is pressed down, the inward concave part reduces the extrusion deformation of the pile casing to the surrounding soil layer, when the pile casing reaches a preset pile position, the grouting pipe is inserted to inject the elastic concrete, and under the condition of gradually lifting the pile casing, the concrete is poured in the pile casing, so that on one hand, the elastic concrete is favorable for improving the combination with the surrounding soil layer, and the extrusion to the soil layer can be reduced compared with the common concrete, on the other hand, after the pile casing is lifted, the concrete poured in the pile casing is combined with the elastic concrete in a meeting mode, the outer side of the concrete is formed near the inward concave part, the high-strength concrete of the inner layer improves the adaptability of the cast pile to the soil layer, and the deformation effect of the surrounding soil layer is reduced.

According to the installation method of the construction device of the static pressure pile sinking structure, the rising speed of the elastic concrete is higher than that of the pile casing when the grouting pipe is grouted in the step 3, so that the elastic concrete can be filled in the concave part contacting with the soil layer.

In the step 3, before the steel reinforcement cage is placed, the inner cylinder is firstly installed on the hoop, concrete is injected into the pile casing, the inner cylinder is pressed downwards to extrude the concrete in the pile casing from the bottom of the pile casing, and the concrete is diffused to the periphery under the extrusion of the inner cylinder to form a thick pile bottom, so that the anchoring property of the cast-in-place pile is improved.

Compared with the prior art, the invention has the following advantages and beneficial effects:

1. the outer side wall of the pile casing is provided with the plurality of vertical concave parts, so that the extrusion to the peripheral soil layer can be reduced in the process of feeding the pile casing into the soil layer, and during pouring, the elastic concrete is poured into the inner concave part through the grouting pipe, and the extrusion deformation to the peripheral soil layer can be relieved after pile forming.

2. During grouting, the elastic concrete outside the pile casing and the concrete inside the pile casing are simultaneously grouted, so that the concrete of the pile body is more uniformly and fully distributed, and the binding force with a soil layer is increased.

3. The invention forms steps at the bottom of the pile casing through the concave part, and adopts the modes of holding the pile casing and propping against the steps when the pile casing is put into the ground, thereby effectively ensuring the verticality of the soil under the pile casing.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

fig. 1 is a schematic structural view of the casing of the present invention when soil is discharged.

FIG. 2 is a schematic view of the inner barrel of the present invention when pressed down.

Fig. 3 is a schematic perspective view of the casing of the present invention.

Fig. 4 is a schematic end structure view of the casing of the present invention.

Reference numbers and corresponding part names in the drawings:

1-pile casing, 2-concave part, 3-grouting pipe, 4-pile shoe, 5-step, 6-bracket, 7-first hydraulic cylinder, 8-second hydraulic cylinder, 9-hoop, 10-pressing plate and 11-inner cylinder.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.