CN108330981B

CN108330981B - Cast-in-place pile concrete vibrating device and vibrating method thereof

Info

Publication number: CN108330981B
Application number: CN201711423794.2A
Authority: CN
Inventors: 刘思谋
Original assignee: Mcc Communication Construction Group Co Ltd
Current assignee: Mcc Communication Construction Group Co Ltd
Priority date: 2017-12-25
Filing date: 2017-12-25
Publication date: 2020-02-11
Anticipated expiration: 2037-12-25
Also published as: CN108330981A

Abstract

A concrete vibrator for pouring pile and its vibrating method are disclosed, the vibrator includes: a vibrating ring; one or more motors arranged on the periphery of the vibration ring along the circumferential direction, wherein the rotating shafts of the motors penetrate through the vibration ring inwards along the radial direction of the vibration ring; the positioning cylinder is a hollow pipe body and is coaxially arranged in the center of the vibration ring; the vibrating sleeve, one or more vibrating sleeve connect between a location section of thick bamboo and vibration ring, have the vibration axle in the vibration sleeve, the one end of vibration axle with the rotation axis connection of motor is equipped with eccentric block on the other end of vibration axle, and this eccentric block constantly bumps with the inner wall of the circumference of vibration sleeve when making the vibration axle rotatory, and then drives the vibration ring and produce high-frequency vibration. The concrete vibrated by the cast-in-place pile concrete vibrating device of the invention fills the compact pile foundation, and the bond strength between the concrete and the reinforcement cage is better. The pile body concrete is more firmly solidified with the surrounding soil body. The conduit vibrates under the action of the vibrating device, so that the concrete in the conduit is accelerated to flow, and the phenomenon of pipe blockage caused by poor workability of the concrete is prevented.

Description

Cast-in-place pile concrete vibrating device and vibrating method thereof

Technical Field

The invention relates to the field of building construction, in particular to a cast-in-place pile concrete vibrating device and a vibrating method thereof.

Background

Currently, concrete is an integrally dense engineering composite material formed by binding aggregates with cementitious materials (cement). Has been widely applied to the field of foundation construction such as building engineering, bridge engineering, traffic engineering and the like. In general, the bored pile does not adopt a mechanical vibration pouring mode, namely dense concrete, but certain air is mixed into concrete mixture in the stirring, transporting and pouring processes, bubbles are increased after the concrete is added with an additive, the porosity of the concrete is increased after the concrete is condensed and hardened, and the phenomena of bubbles, sand inclusion, cracks and segregation are found on the surface of a concrete core sample by coring the concrete of the bored pile.

The non-compact concrete will cause the weakening of the section of the pile and the reduction of the bearing capacity. Moreover, since the concrete is not dense, there are fine holes and cracks, and external moisture, salt and gas easily invade the interior of the concrete, so as to corrode the reinforcing steel bars, resulting in premature damage to the structure and affecting the service life of the structure. The prior inserted concrete vibrating device can not effectively vibrate the concrete of the cast-in-situ bored pile, so the prior concrete vibrating device needs to be further improved to avoid the harm of incompact concrete vibration.

Disclosure of Invention

A cast-in-place pile concrete vibrating device comprises: a vibrating ring; one or more motors arranged on the periphery of the vibration ring along the circumferential direction, and the rotating shaft of each motor penetrates through the vibration ring inwards along the radial direction of the vibration ring; the positioning cylinder is a hollow pipe body and is coaxially arranged in the center of the vibration ring; the vibration cover, one or more vibration cover are connected between a location section of thick bamboo and vibration ring to, have the vibration axle in the vibration cover, the one end of vibration axle with the rotation axis connection of motor is provided with the eccentric block on the other end of vibration axle, makes and is passing through this eccentric block constantly bumps with the inner wall of the circumference of vibration cover when motor drive vibration axle is rotatory, and then drives the vibration ring and produce high-frequency vibration.

Preferably, the at least one vibration sleeve is fixedly connected to the inner side of the vibration ring by a spring.

Preferably, the periphery of the spring is sleeved with a rubber tube with two sealed ends, so that cement paste is prevented from entering.

Preferably, the vibration ring is provided with a suspension ring on the upper surface thereof symmetrically.

Preferably, the individual vibration sleeves are distributed uniformly in the radial direction of the vibration ring.

Preferably, the motor is a miniature submersible motor.

Preferably, the cables for supplying power to the motors are built into the vibrating ring.

Preferably, at least one vibration shaft is connected with a rotating shaft of a corresponding motor by a universal joint.

The invention also provides a method for vibrating cast-in-place pile concrete by using the cast-in-place pile concrete vibrating device, which comprises the following steps:

1) forming pile holes at the pile positions, and arranging reinforcement cages in the pile holes;

2) placing a conduit string formed by connecting a plurality of sections of conduits into the reinforcement cage, and connecting the bottom end of the lowest section of conduit with the positioning cylinder of the concrete vibrating device;

3) after the guide pipe string sinking pile is arranged at the bottom of the pile hole, the distance lower than the pouring height of the first batch of concrete is lifted, and a funnel for pouring the concrete is arranged at the upper end of the guide pipe;

4) pouring concrete, after the first batch of concrete is poured, starting the vibrating device, and gradually lifting the guide pipe along with the rising of the concrete pouring surface to enable the vibrating device to vibrate the concrete of all the pile bodies until the concrete is poured to the designed height.

Preferably, the upper end of the positioning cylinder is connected with the guide pipe by threads or a flange.

The concrete vibrated by the cast-in-place pile concrete vibrating device of the invention fills the compact pile foundation, and the bond strength between the concrete and the reinforcement cage is better. The pile body concrete is more firmly solidified with the surrounding soil body. And the guide pipe vibrates under the action of the vibrating device, so that concrete in the guide pipe flows at an accelerated speed, the phenomenon of pipe blockage caused by poor workability of the concrete is prevented, the smooth concrete pouring is ensured, quality accidents are avoided, and more serious pile breakage accidents are avoided.

Drawings

The above features and technical advantages of the present invention will become more apparent and readily appreciated from the following description of the embodiments thereof taken in conjunction with the accompanying drawings.

Fig. 1 is a plan view showing a cast-in-place pile concrete vibrating device according to an embodiment of the present invention;

FIG. 2 is a sectional view taken along line A-A of FIG. 1;

FIG. 3 is a sectional view taken along line A-A of FIG. 1;

FIG. 4 is a schematic construction diagram of a cast-in-place pile concrete vibrating device according to an embodiment of the present invention;

FIG. 5 is a schematic diagram illustrating another form of vibration in accordance with an embodiment of the present invention.

Detailed Description

Embodiments of a cast-in-place pile concrete vibrating device and a vibrating method thereof according to the present invention will be described below with reference to the accompanying drawings. Those of ordinary skill in the art will recognize that the described embodiments can be modified in various different ways, or combinations thereof, without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims. Furthermore, in the present description, the drawings are not to scale and like reference numerals refer to like parts.

A cast-in-place pile concrete vibrating device is shown in figures 1 and 2 and comprises a motor 101, a vibrating ring 102, a cable 103, a vibrating sleeve 106 and a positioning barrel 107. The vibration ring 102 is in a ring shape, one or more motors 101 are disposed outside an outer circumference of the vibration ring 102, a cable 103 supplies power to each motor 101, and a rotation shaft 1010 of the motor 101 penetrates the vibration ring 102 inward in a radial direction of the vibration ring 102. Preferably, to make the transmission smoother, the rotating shaft 1010 is supported in the vibration ring 102 by a first bearing 109. A positioning cylinder 107 with the axis coaxial with the axis of the vibration ring 102 is arranged at the center of the vibration ring 102, and the positioning cylinder 107 is used for connecting with an upper guide pipe and has a positioning function when the vibrating device is inserted into concrete. For each motor 101, a vibration sleeve 106 is connected between the positioning cylinder 107 and the motor 101. And, the sealed connection between motor 1 and vibration ring 102 prevents the grout from soaking into motor 101. In fig. 1, 8 motors are used, and correspondingly, 8 vibrating sleeves 106 are provided, one end of each vibrating sleeve is fixedly connected with the outer side of a positioning cylinder 107, and the other end of each vibrating sleeve is fixedly connected with the inner side of a vibrating ring 102. The above-mentioned fixed connection can adopt the fixed connection mode such as welding, bonding, riveting, bolted connection, adopts welded mode in this embodiment. And a vibration shaft 108 is provided in the vibration housing 106, and one end of the vibration shaft 108 is connected to a rotation shaft 1010 of the motor 101. And an eccentric mass 1081 is provided on the vibration shaft 108, and the eccentric mass 1081 has a predetermined gap with the inner wall of the vibration sleeve 106 in the radial direction. When the vibrating shaft 108 rotates, the vibrating shaft collides with the circumferential inner wall of the vibrating sleeve 106 under the action of centrifugal force, so that the vibrating sleeve 106 generates high-frequency vibration. The preset gap is related to the generated vibration magnitude, the larger the preset gap is, the larger the generated vibration magnitude is, and the smaller the preset gap is, the smaller the generated vibration magnitude is. Each of the vibration sleeves 106 generates vibration in respective radial directions around the outer circumference thereof, thereby enabling the vibration ring 102 to generate both vibration in the up-down direction and vibration in the radial direction of the vibration ring 102. This can produce a good vibrating effect on the concrete around the vibrating ring. Since the pile hole and the reinforcement cage are cylindrical in the construction of the cast-in-place pile, the vibration ring 102 with a circular ring shape can better transmit the radial vibration to the concrete around the reinforcement cage.

In addition, a transmission (not shown) may be disposed between the motor output shaft 1010 and the vibration shaft 108, and the motor speed may be adjusted to a suitable speed by using stepless speed change. If a transmission is used, the output shaft of the transmission is connected to the vibration shaft 108.

The form of the vibrating shaft in fig. 2 is merely exemplary, mainly so that one end of the vibrating shaft 108 collides with the inner wall of the vibrating sleeve 106 by means of an eccentric mass while rotating. As shown in fig. 3, it is also possible to connect the small diameter end of a conical tube 1012 with the rotating shaft 1010 of the motor 101, and to cut off part of the tube body in a direction forming an angle with the axial direction of the conical tube 1012, so that the large diameter end thereof forms an eccentric mass. While rotating, the large diameter end of the tapered tube constantly collides with the inner wall of the vibrating sleeve 106.

The cast-in-place pile concrete vibrating device of the embodiment can enable each section of concrete in the cast-in-place pile to be vibrated compactly. And moreover, the concrete around the reinforcement cage can be vibrated, so that the acting force of the concrete to the outer periphery is increased, and the concrete and the soil body around the pile can be well solidified. The cast-in-place pile concrete vibrating device is used for vibrating cast-in-place pile concrete, and the bearing capacity of a pile foundation is effectively improved.

In an alternative embodiment, at least one vibratory shaft 108 is gimbaled to a rotating shaft 1010 of a corresponding motor.

In an alternative embodiment, at least one vibrating sheath 106 is connected to vibrating ring 102 by a spring 105. Specifically, the vibrating sleeve 106 is fixedly connected to one end of the spring 105, and the other end of the spring 105 is fixedly connected to the inner side of the vibrating ring 102.

In an alternative embodiment, a rubber tube 104, preferably a high fiber rubber tube 104, is sleeved around the outer circumference of the spring 105. The two ends of the rubber tube 104 extend to cover the length range of the spring respectively, and the two ends of the rubber tube 104 are sealed to prevent cement paste from entering.

In an alternative embodiment, at least one hanging ring mounting hole 1011 is formed on the upper surface of the vibration ring 102, and the hanging ring is mounted on the vibration ring 102 through the hanging ring mounting hole 1011, so as to facilitate the hoisting of the concrete vibrating device.

In an alternative embodiment, the upper end of the positioning sleeve 107 has a connection structure for connecting to a conduit for casting concrete, for example, a screw thread, or a flange. Preferably, internal threads are used.

In an alternative embodiment, at least one of the motors 101 is a miniature submersible motor.

In an alternative embodiment, the cables 103 may be embedded in the vibration ring 102, and the vibration ring may be provided with threading holes in the circumferential direction thereof, so that the cables 103 are all threaded through the threading holes.

In an alternative embodiment, the vibration mode of the vibration housing may be as shown in fig. 5, the vibration shaft 108 in the vibration housing 106 is connected to the rotation shaft 1010 of the motor, and both ends of the vibration shaft 108 are coaxially supported in the vibration housing 106 by the second bearings 1015. The eccentric mass 1081 is provided on a portion of the vibration shaft 108 between the two second bearings, and the eccentric mass 1081 generates eccentric vibration while the vibration shaft 108 rotates, and is transmitted to the vibration housing 106 via the second bearings 1015 at both ends.

The invention also provides a method for vibrating the cast-in-place pile concrete by using the cast-in-place pile concrete vibrating device.

1) And measuring the pile position, forming a pile hole in the pile position, preferably drilling the pile hole by using a percussion drill, and cleaning the hole after the hole is formed.

2) And hoisting the reinforcement cage, and placing the reinforcement cage in the pile hole. Preferably, the reinforcement cage is arranged and then subjected to secondary hole cleaning.

3) And a guide pipe string formed by connecting a plurality of sections of guide pipes is arranged in the reinforcement cage, and a concrete vibrating device is arranged at the bottom end of the lowest section of guide pipe, specifically, the lower end screw thread of the guide pipe is screwed with the inner screw thread of a positioning cylinder 7 of the vibrating device.

4) After the guide pipe string sinking pile is sunk to the bottom of the pile hole, the distance lower than the pouring height of the first batch of concrete is lifted, and a funnel for pouring the concrete is installed at the upper end of the guide pipe.

5) Pouring concrete, after the first batch of concrete is poured, starting the vibrating device, and slowly lifting the guide pipe along with the continuous rising of the concrete pouring surface to enable the vibrating device to vibrate the concrete of the whole pile body until the concrete is poured to the designed height.

The construction process is described in detail with reference to fig. 4. The size of the vibrating device is as follows: the positioning cylinder 107 has an inner diameter of 32cm and an outer diameter of 34 cm. The height of the positioning cylinder 107 was 30 cm. The vibrating ring 102 has an outer diameter of 2.3m and an inner diameter of 2.1 m. The vibrating device adopts 12 motors in total, and the motor power of the vibrating device is 80 w. The vibrating sleeve has an outer diameter of 10cm and an inner diameter of 8 cm. The spring 105 has an outer diameter of 10cm, a wire diameter of 8mm and a length of 15cm at rest. In addition, in the case of no power supply on site, each electric device may be powered by the generator 204, and the power of the generator 204 is 50 kw.

1) And measuring the pile position, embedding the steel pile casing 205, drilling a pile hole by using a percussion drill, and cleaning the hole after the hole is formed.

2) Hoisting the reinforcement cage 201, placing the reinforcement cage 201 in the pile hole, and cleaning the hole for the second time.

3) A conduit string formed by connecting a plurality of sections of conduits is arranged in the reinforcement cage 201, and the inner diameter of the conduit 202 is 30cm, and the outer diameter is 32 cm. And the concrete vibrating device 10 is arranged at the bottom end of the lowest section of the guide pipe, and particularly, the lower end screw thread of the guide pipe 202 is screwed and connected with the inner screw thread at the upper end of the positioning cylinder 107 of the vibrating device 10. And, in order to prevent the screw thread from loosening due to vibration, an anti-drop fastener is installed at the screw thread connection part to prevent the vibrating device from dropping.

4) And (3) after the guide pipe string is sunk to the bottom of the hole, lifting the guide pipe string by 30-50 cm, preferably 40 cm. A funnel 207 for concrete pouring is installed at the upper end of the guide pipe 202. The valve of the funnel is closed, the pump truck 203 injects concrete (the concrete with the strength grade of c30 is used for sealing the bottom) into the funnel 207, after the funnel is filled with concrete, the valve is opened, and the first batch of concrete flows to the bottom of the pile hole through the conduit 202. At the moment, the distance between the concrete vibrating device 10 and the bottom of the hole is 40cm, and the poured concrete surface 206 is measured to rise to 1 meter by using a measuring rope 2013, namely the concrete burial depth reaches 1 m. Wherein raising and lowering of the conduit 202 is effected by means of a hoist 209. Specifically, a steel support 2014 is erected above the pile hole, a fixed pulley 2015 is installed at the top end of the steel support 2014, and a steel wire rope 208 of the winch 209 is connected with the top end of the funnel through the fixed pulley 2015.

5) The starter generator 204 supplies power to each motor 101 and current flows through the cable 103 to the drive motor 101 of the tamper assembly 10 to start the tamper assembly 10. The vibration shaft 108 continuously collides with the vibration sleeve 106 when rotating and rolling, and high-frequency vibration is formed. The vibrating sleeve 106 and the vibrating ring 102 are brought into resonance by the spring 105. The vibration time is determined according to the concrete slump test, and the vibration is stopped 15 seconds after the first vibration. The concrete continues to be poured, the guide pipe 202 is slowly lifted up along with the rising of the concrete surface 206, and the vibration is continuously carried out, so that the vibration of each section is ensured to be not less than 5 seconds. During the process of lifting the catheter 202, the catheter 202 is lifted upward by the hoist 209. The lifting speed of the guide pipe 202 is determined according to the lifting speed of the concrete surface 206, the concrete surface 206 is measured by the measuring rope 2013 at any time, and the lifting speed and the lifting height of the guide pipe 202 are controlled to prevent pile breaking accidents caused by the fact that the guide pipe 202 is pulled out by mistake and exceeds the concrete surface 206. The pipe 202 lifted above the ground needs to be removed, and when the pipe 202 is removed, the switch of the motor 101 is turned off to stop vibrating. The concrete surface 206 rises to the design height and stops pouring concrete. And continuously lifting the guide pipe 202 to enable the vibrating device 10 to vibrate the concrete of the whole pile body. The vibrating device is then lifted out of the hole, cleaned, and the steel casing 205 is pulled out. The concrete compressive strength can reach C35 after two days, and the concrete compressive strength is improved. And detecting the pile to be an A-type pile by ultrasonic waves, and finishing construction. And the pile can be tested after 15 days.

In an alternative embodiment, the spring 105 is coated on its outer circumference with a rubber tube 104, preferably of a high fiber material. One end of the rubber tube 104 extends to the outer periphery of the vibration sleeve 106, and the other end extends to the inner side of the vibration ring 102, and both ends of the rubber tube 104 are sealed to prevent cement paste and the like from entering and blocking the movement of the spring 105 and the vibration shaft 108.

In an alternative embodiment, a safety mechanism is provided on the tamper apparatus 10. Specifically, as shown in fig. 4, a horizontal cross bar 2017 is further fixed to the wire rope 208, the upper end of the safety rope 2016 is connected to the two ends of the cross bar 2017, and the lower end of the safety rope 2016 is connected to a suspension ring of the vibrating device 10. Even in the event that the wire rope 208 breaks due to an accident, the safety line 2016 still protects the conduit string and the tamper from falling.

By adopting the cast-in-place pile concrete vibrating device and the vibrating method thereof, the vibrated concrete fills the compact pile foundation, and the bond stress between the concrete and the reinforcement cage is better. The pile body concrete is more firmly solidified with the surrounding soil body. And the guide pipe vibrates under the action of the vibrating device, so that the concrete in the guide pipe flows at an accelerated speed, the phenomenon of pipe blockage caused by poor workability of the concrete is prevented, and the smooth pouring of the concrete is ensured.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A bored concrete pile concrete vibrator, characterized by, includes:

a vibrating ring;

one or more motors arranged on the periphery of the vibration ring along the circumferential direction, and the rotating shaft of each motor penetrates through the vibration ring inwards along the radial direction of the vibration ring;

the positioning cylinder is a hollow pipe body and is coaxially arranged in the center of the vibration ring;

one or more vibration sleeves are connected between the positioning cylinder and the vibration ring, and,

the vibrating sleeve is internally provided with a vibrating shaft, one end of the vibrating shaft is connected with a rotating shaft of the motor, and the other end of the vibrating shaft is provided with an eccentric block, so that the eccentric block continuously collides with the circumferential inner wall of the vibrating sleeve when the motor drives the vibrating shaft to rotate, and then the vibrating ring is driven to generate high-frequency vibration.

2. The cast-in-place pile concrete vibrating device according to claim 1, wherein at least one vibrating sleeve is fixedly connected with the inner side of the vibrating ring through a spring.

3. The cast-in-place pile concrete vibrating device according to claim 2, characterized in that a rubber tube with two sealed ends is sleeved on the periphery of the spring to prevent cement slurry from entering.

4. The cast-in-place pile concrete vibrating device according to claim 1, characterized in that lifting rings are symmetrically arranged on the upper surface of the vibrating ring.

5. The cast-in-place pile concrete vibrating device according to claim 1, wherein each vibrating sleeve is uniformly distributed along a radial direction of the vibrating ring.

6. The cast-in-place pile concrete vibrating device according to claim 1, wherein the motor is a micro submersible motor.

7. The cast-in-place pile concrete vibrating device according to claim 1, wherein cables for supplying power to each motor are built in the vibrating ring.

8. The cast-in-place pile concrete vibrating device according to claim 1, wherein at least one vibrating shaft is connected with a rotating shaft of a corresponding motor by a universal joint.

9. A method for vibrating cast-in-place pile concrete by using the cast-in-place pile concrete vibrating device of any one of claims 1 to 8, which is characterized by comprising the following steps:

10. The method for vibrating cast-in-place pile concrete according to claim 9, wherein the upper end of the positioning cylinder is connected with the guide pipe by a thread or a flange.