CN108316331B - A concrete composite pile foundation - Google Patents

Abstract

The invention discloses a concrete composite pile foundation, which comprises a settlement-resistant pile implanted into a soil layer, a pile cap coaxially sleeved on the top of the settlement-resistant pile, and a bearing platform supported on the top of the pile cap; the pile cap is a concrete prefabricated tubular pile, and concrete is filled between the pile cap and the anti-settling pile for fixedly connecting; the anti-settling pile comprises a steel pipe body and an anti-settling mechanism arranged in the pipe body; the anti-settling mechanism comprises four anti-settling rods arranged in a cross shape and four lead screw nut pairs which correspond to the anti-settling rods one by one and are used for driving the anti-settling rods to extend out of the pipe body; a lead screw of each lead screw nut pair is provided with a bevel gear; the pile foundation is reasonable in structure, the pile which resists to sink and pull on soft soil cannot loosen and longitudinally slide, and the sink and pull performance and the dynamic load resistance are improved.

Description

A concrete composite pile foundation

technical field

The invention relates to the field of pile foundations, in particular to a concrete composite pile foundation.

Background technique

At present, a large number of concrete pile foundation structures are used in municipal engineering and house foundations in cities such as plains and seasides. It is difficult to use traditional methods to carry out construction on soft soil. More importantly, traditional cylindrical pile structures are used in soft soil. Loosening and longitudinal sliding are easy to occur in the middle of the building, and there are defects such as a serious lack of anti-sinking force, insufficient lateral shear resistance and insufficient dynamic load resistance, which directly affect the stability and reliability of the building foundation. In the subject of "Research on the Deformation Mechanism and Settlement Control Technology of Railway High Embankment Slope" declared by the inventor of this application (this subject is an open subject of the Ministry of Education's Key Laboratory of Road and Railway Engineering Safety and Security, and the subject number is STKF201718) , It is necessary to use a pile foundation structure with strong anti-settling ability. In traditional construction, in order to improve the stability of the building foundation in soft soil and increase the friction between the pile body and the soil layer, the usual method can only simply increase the depth of the pile body and penetrate as deep as possible to the foundation. Soil, the construction difficulty increases, the construction period is long, resulting in high construction cost, and the increase of the pile body weight is not conducive to the longitudinal stability of the pile body. The settlement is obvious in the soft soil, but the anti-sinking performance and the anti-dynamic load capacity have not been significantly improved, which cannot meet the requirements of actual construction.

SUMMARY OF THE INVENTION

In view of this, the purpose of the present invention is that the existing anti-sinking and pulling-up structure is simple, the piles on the soft soil are prone to loosening and longitudinal sliding, and the anti-sinking and pulling-up performance and dynamic load resistance are insufficient, resulting in the construction foundation. The defects and deficiencies of poor stability and reliability, now provide a reasonable structure, the anti-sinking pile on the soft soil will not appear loosening and longitudinal sliding, and the anti-sinking performance and dynamic load resistance have been improved. A kind of concrete composite pile foundation for soft soil with good stability and reliability of building foundation.

The concrete composite pile foundation of the present invention includes an anti-settlement pile implanted in a soil layer, a pile cap coaxially sheathed on the top of the anti-settlement pile, and a cap supported on the top of the pile cap; the pile cap is made of concrete The prefabricated cylindrical pile, the pile cap and the anti-settlement pile are filled with concrete for fixing; the anti-settlement pile includes a steel pipe body, and an anti-settlement mechanism is arranged in the pipe body; the anti-settlement mechanism includes four Anti-sinking rods arranged in a "cross" shape and four screw nut pairs corresponding to the anti-sinking rods and used to drive the anti-sinking rods out of the pipe body; The screw rods are equipped with bevel gears;

Further, the bottom of the cap is provided with a circular groove for embedding the pile cap;

Further, a pile pad made of flexible foam plastic is arranged above the pile cap, and a plain concrete cushion is arranged between the pile pad and the bearing platform;

Further, the anti-settling mechanism further includes an impact assembly; the impact assembly includes an impact rod that is slidably fitted in the central hole of the anti-sinking rod, and is used to push the impact rod out of the spring for impacting rock and soil, and is fixed at the end of the impact rod The permanent magnet, and the electromagnet arranged in the tube body for attracting the permanent magnet to make the impact rod compress the spring;

Further, the central hole of the anti-sinking rod is provided with a helical groove extending around the axis thereof, and the impact rod is provided with a support rod that is slidably matched with the helical groove.

Further, a cross-shaped chassis is arranged in the tube body; four screw nut pairs are respectively installed on the four lateral wings of the cross-shaped chassis, and the four lateral wings are provided with chute; The nut is fixed with a sliding block slidingly matched with the chute; the anti-sinking rod is fixed on the sliding block;

Further, support arms are integrally formed on both sides of the slider; the lower surface of the support arm is an arc surface, and is cross-armed on the side wings through the arc surface;

Further, the electromagnet includes a cross-shaped iron core and a first coil and a second coil wound on the cross-shaped iron core;

Further, the bottom of the cross-shaped chassis is fixed with a spring seat corresponding to the four impact rods one-to-one; the impact rod fixing jacket is provided with a snap ring, and the spring is arranged between the snap ring and the spring seat;

Further, the spring seat is made of a polymer material, which is provided with a through hole, the iron core is fixed in the through hole, and the outer end of the impact rod forms a drill bit structure.

Beneficial effects of the present invention: For the concrete composite pile foundation of the present invention, during construction, after the pipe body is implanted into the soil layer, the drive rod with the bevel gear plate fixed at the lower end is extended into the pipe body from the upper end of the pipe body, so that the bevel gear The disk meshes with the four bevel gears at the same time, and the drive rod drives the four screw rods to rotate simultaneously through the bevel gear disk. Four through holes should be set to extend the anti-sinking rod, thereby greatly improving the anti-settling capacity of the pile foundation.

Description of drawings

The present invention will be further described below with reference to the accompanying drawings and embodiments.

Fig. 1 is the structural representation of the present invention;

Fig. 2 is the schematic diagram of the anti-settling pile of the present invention;

Fig. 3 is the structural view of the anti-settling mechanism of the present invention;

Fig. 4 is the arrangement schematic diagram of the screw nut pair of the present invention;

5 is a schematic structural diagram of a slider in the present invention;

6 is a schematic diagram of the electromagnet of the present invention.

Detailed ways

1 is a schematic structural diagram of the present invention, as shown in the figure: the concrete composite pile foundation of the present embodiment includes an anti-settlement pile implanted in a soil layer, a pile cap 5 coaxially sheathed on the top of the anti-settlement pile, and a pile cap 5 supported on the top of the anti-settlement pile The cap 1 on the top of the pile cap 5; the pile cap 5 is a concrete prefabricated cylindrical pile, and the concrete 4 is filled between the pile cap 5 and the anti-settlement pile for fixing; the anti-settlement pile includes a pipe body 7, which is provided with The anti-settling mechanism 6 in the pipe body 7; the anti-settling mechanism 6 includes four anti-settling rods 11 arranged in a "cross" shape and one-to-one correspondence with the anti-settling rods 11 for driving the The anti-sinking rod 11 extends out of the four screw nut pairs outside the pipe body 7; the screw rod 20 of each of the screw nut pairs is provided with a bevel gear 22; during construction, after the pipe body 7 is implanted in the soil layer, Extend the drive rod with the bevel gear plate 14 fixed at the lower end into the tube body 7 from the upper end of the pipe body 7, so that the bevel gear plate 14 meshes with the four bevel gears 22 at the same time, and the drive rod drives the four bevel gears 22 simultaneously through the bevel gear plate 14. The screw rod 20 rotates, and the screw rod 20 drives the nut to move outward in the axial direction to drive the anti-sinking rod 11 to extend outward. Greatly improve the anti-settling capacity of the pile foundation.

In this embodiment, the bottom of the cap 1 is provided with a circular groove for embedding the pile cap 5; the pile cap 5 is provided with a pile pad 3 made of flexible foam plastic, and the pile pad 3 is connected to the cap 1 . There is a plain concrete cushion 2 in between.

In this embodiment, the anti-settling mechanism 6 further includes an impact assembly; the impact assembly includes an impact rod 10 slidably fitted in the center hole of the anti-sinking rod 11, and used to push the impact rod 10 out of a spring for impacting rock and soil 15, the permanent magnet fixed on the end of the impact rod 10, and the electromagnet 17 arranged in the pipe body for attracting the permanent magnet to make the impact rod 10 compress the spring 15; in the process of using the screw nut pair to push the pull-out rod out In the middle, the electromagnet 17 can be energized to attract the permanent magnet to drive the impact rod 10 to retract into the tube body and compress the spring 15, and then power off the electromagnet 17. The impact is performed to chisel a hole, so that the anti-sinking rod 11 can extend out of the pipe body and reduce the resistance of the anti-sinking rod 11 .

In this embodiment, the central hole of the anti-sinking rod 11 is provided with a helical groove extending around its axis, and the impact rod 10 is provided with a support rod that slides with the helical groove, and the support rod is integrally formed on the impact rod When the impact rod 10 slides relative to the anti-sinking rod 11 under the push of the spring 15, it will rotate around the axis at the same time, and through this rotation, the impact rod 10 can drill holes in the rock and soil.

In this embodiment, a cross-shaped chassis 19 is provided in the tube body; four screw nut pairs are respectively installed on the four side wings of the cross-shaped chassis 19 (each screw 20 is supported on the chassis 19 by two bearing seats). upper), and the four side wings are provided with chute; the nut of the screw nut pair is fixed with a slider 13 that slides with the chute; the anti-sinking rod 11 is fixed on the slider 13, and the pipe body There are four rails 8 along the axial direction of the inner wall of the cross-shaped chassis 19, and the outer edges of the four flanks of the cross-shaped chassis 19 are slidably matched with the four tracks respectively. The guide bracket 21 is fixed in the middle of the cross-shaped chassis 19, and the guide bracket 21 is provided with a guide cylinder. The inner diameter of the guide cylinder is slightly larger than the outer diameter of the bevel gear plate. Insert the drive rod 5 together with the bevel gear into the guide cylinder and pass through the guide cylinder, the guide cylinder can effectively guide the drive rod, so that the bevel gear can smoothly mesh with the four bevel gears.

In this embodiment, support arms 27 are integrally formed on both sides of the slider 13; the lower surface of the support arm 27 is a circular arc surface, and is cross-armed on the side wings through the circular arc surface, and the circular arc surface and the side wings are A sliding contact is formed between the surfaces. This contact is a line contact, and its frictional resistance is small; the upper body of the slider 13 is fixedly embedded with a nut, and the lower body 28 of the slider is provided with a mounting hole 8 for interference fit with an anti-sinking rod. .

In this embodiment, the electromagnet 17 includes a cross-shaped iron core 25 and a first coil 23 and a second coil 24 wound on the cross-shaped iron core 25. The iron core 25 includes two mutually perpendicular first rods and second coils Two rods, the first coil 23 and the second coil 24 are wound around the first rod and the second rod respectively. When in use, the first coil 23 and the second coil 24 can be energized alternately, and the two pairs of impact rods 10 can be attracted alternately to complete the impact action. .

In this embodiment, the bottom of the cross-shaped chassis 19 is fixed with four spring seats 16 corresponding to the four impact rods 10 one-to-one. Between the ring 18 and the spring seat 16 ; the snap ring 18 is practical as a support surface of the spring 15 on the one hand, and a limit ring on the other hand, which is used to limit the maximum length of the impact rod 10 extending out of the anti-sinking rod 11 .

In this embodiment, the spring seat 16 is made of a polymer material, which is provided with a through hole, and the iron core 25 is fixed in the through hole. After the iron core 25 passes through the through hole, the iron core 25 is fixed by adhesive It is relatively fixed with the spring seat 16 , so the spring seat 16 serves as a support for the electromagnet 17 at the same time.

In this embodiment, the outer end of the impact rod 10 forms the structure of the drill bit 9, that is, the outer end of the impact rod 10 forms the existing drill bit 9 structure for rock crushing to cooperate with the rotating action of the impact rod 10, and the effect of crushing the rock is better. .

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be Modifications or equivalent substitutions without departing from the spirit and scope of the technical solutions of the present invention should be included in the scope of the claims of the present invention.

Claims (7)

1. The utility model provides a concrete composite pile foundation which characterized in that: the anti-settling pile comprises an anti-settling pile implanted into a soil layer, a pile cap coaxially sleeved on the top of the anti-settling pile, and a bearing platform supported on the top of the pile cap; the pile cap is a concrete prefabricated tubular pile, and concrete is filled between the pile cap and the anti-settling pile for fixedly connecting; the anti-settling pile comprises a steel pipe body and an anti-settling mechanism arranged in the pipe body; the anti-settling mechanism comprises four anti-settling rods arranged in a cross shape and four lead screw nut pairs which correspond to the anti-settling rods one by one and are used for driving the anti-settling rods to extend out of the pipe body; a lead screw of each lead screw nut pair is provided with a bevel gear;

the bottom of the bearing platform is provided with a circular groove for embedding the pile cap;

a pile pad made of flexible foamed plastic is arranged above the pile cap, and a plain concrete cushion layer is arranged between the pile pad and the bearing platform;

the anti-settling mechanism further comprises an impact assembly; the impact assembly comprises an impact rod in sliding fit with the center hole of the anti-sinking rod, a spring for pushing the impact rod out to impact rock and soil, a permanent magnet fixed at the tail end of the impact rod, and an electromagnet arranged in the pipe body and used for attracting the permanent magnet to enable the impact rod to compress the spring.

2. The concrete composite pile foundation of claim 1, wherein: the inner circle surface of the center hole of the anti-sinking rod is provided with a spiral groove extending around the axis of the anti-sinking rod, and the impact rod is provided with a support rod in sliding fit with the spiral groove.

3. The concrete composite pile foundation of claim 2, wherein: a cross-shaped chassis is arranged in the pipe body; the four screw rod nut pairs are respectively and correspondingly arranged on four side wings of the cross-shaped chassis, and the four side wings are provided with sliding chutes; a sliding block in sliding fit with the sliding groove is fixed on a nut of the screw-nut pair; the anti-sinking rod is fixed on the sliding block.

4. The concrete composite pile foundation of claim 3, wherein: support arms are integrally formed on two sides of the sliding block; the lower surface of the supporting arm is an arc surface and is crossarm on the side wing through the arc surface.

5. The concrete composite pile foundation of claim 4, wherein: the electromagnet comprises a cross-shaped iron core, and a first coil and a second coil which are wound on the cross-shaped iron core.

6. The concrete composite pile foundation of claim 5, wherein: spring seats which correspond to the four impact rods one by one are fixed at the bottom of the cross-shaped chassis; the fixed overcoat of jump bit has the snap ring, the spring sets up between snap ring and spring holder.

7. The concrete composite pile foundation of claim 6, wherein: the spring holder is made by macromolecular material, and it is equipped with the through-hole, in the iron core is fixed in the through-hole, the outer end of impact rod forms the drill bit structure.

Images