CN117026975A - Low-clearance soft foundation treatment construction device - Google Patents

Abstract

A low clearance soft foundation treatment construction device belongs to the field of soft foundation treatment, a drill rod of the low clearance soft foundation treatment construction device is installed and disassembled at a holding device, a fixed wing provided with a counter force wing is installed in a drill bit connected with the drill rod, the fixed wing is meshed with a conical gear of a rotary cutter shaft, a core rod is connected with the fixed wing through a bearing, a grouting (air) pipe is installed in the core rod, two ends of a shell are respectively connected with the core rod and the fixed wing, and stirring blades are connected to the core rod at the bottom of the drill bit. The invention has the advantages that: the clearance height is lower, and the construction can be performed under the condition of limited height; the mechanical arm automatically loads and unloads the drill rod, the fixed wing is connected with the drill bit through a bearing in a single action mode, the rotary-cut blades and the three-wing stirring blades are subjected to three-dimensional cross stirring under the action of the counter-force wings, and the air pipe performs air explosion into the stirred soil body, so that the soil body and the curing agent are uniformly mixed, the adaptability to complex stratum is improved, the strength and the integrity of a pile body are improved, and the pile forming quality is greatly improved; the mixing amount of the curing agent is small, the construction cost is low, and the engineering cost is obviously reduced.

Description

Low-clearance soft foundation treatment construction device

Technical Field

The invention belongs to the field of building construction, and particularly relates to a low-clearance soft foundation treatment construction device for soft foundation treatment.

Background

The cement mixing pile is suitable for treating soft foundation with saturated soft clay, high water content and other foundation including silt, mucky soil, silt soil, sandy soil, peat soil and other factors. The maximum reinforcement depth of the foundation can reach 30m.

The cement soil reinforcing body formed by the cement soil mixing piles can be used as a composite foundation for vertical bearing, a retaining wall for foundation pit engineering, an impermeable curtain, a large-volume cement stabilized soil and the like, and has simple construction process and low cost.

The construction method has the advantages of no vibration, no noise, no ground bulge, no pollution discharge and no environmental pollution in the construction process, and has no harmful effect on adjacent buildings, thus having better comprehensive economic benefit and social benefit.

The pile frame of the traditional cement mixing pile construction machine is higher, and under some special conditions, certain limitations exist in application:

1. the existing railway line area is adjacent, construction is performed within a certain distance range near the existing railway line due to the regulations of a railway related management method, and the height of the construction machine is limited;

2. in the area near the high-voltage line, the voltage on the high-voltage line is higher, the radiation has a certain distance, and the construction safety distance is ensured, so that the height of the construction machine is also limited;

3. the tunnel and bridge and culvert areas have limitations on the height of the machine to be constructed in the space due to the limitations of the clearance heights of the tunnel and the bridge and culvert.

In addition, the stirring device of the traditional cement-soil stirring pile drill bit is provided with two crossed straight stirring teeth, the rotation number of a drill rod is lower, when the soil with stronger viscosity is encountered, the phenomenon that clay is adhered to the stirring teeth and the drill rod exists, so that the stirring teeth cannot effectively cut soil, slurry (curing agent) and soil cannot be fully mixed, even the phenomenon that the soil cannot be crushed and filled with cement slurry (curing agent) appears in site, the content of cement (curing agent) in a drilling core sample is very small, a formed cement stirring pile does not form a pile, the stirring effect is poor, and the pile body strength cannot meet the design requirement.

Disclosure of Invention

The invention aims to provide a low-clearance soft foundation treatment construction device, and the construction is carried out by the construction device, so that the cement-soil mixing pile process can be implemented under the special environment condition of limited height, and under the cutting and stirring actions of an improved drill bit, the soft foundation and a curing agent can be quickly and fully stirred, and the strength and the quality of a cement-soil mixing pile body are improved.

The invention aims at realizing the following technical scheme: the utility model provides a low headroom soft foundation handles construction equipment which characterized in that: comprises a pile machine main tower, a drill rod and a drill bit; the utility model provides a pile driver main tower is last to be fixed and is used for holding the holding device of drilling rod, the drill bit is connected with the drilling rod, the drill bit includes shell, core bar, slip casting (air) pipe, fixed wing, counter-force wing, rotary cutter arbor and stirring vane, install the fixed wing in the shell, the lower extreme of fixed wing is equipped with the counter-force wing, and the counter-force wing stretches out to the fixed wing bilateral symmetry, and the suit bevel gear on the fixed wing, install multiunit rotary cutter arbor on the shell wall, every group rotary cutter arbor sets up relatively, and adjacent rotary cutter arbor is in different planes, and staggers each other, is equipped with rotary cutter blade on the rotary cutter arbor, the one end that the rotary cutter arbor is located the shell is the bevel gear, and the intermeshing with the bevel gear of outer suit of fixed wing, core bar top-down runs through shell and fixed wing to be connected with the fixed wing through the bearing, install slip casting (air) pipe in the core bar, the upper end and the core bar fixed connection of shell, the lower extreme and the fixed wing of shell are connected through the bearing, the bottom of core bar is equipped with the drill point, connect stirring vane on the core bar apart from the near the core bar of drill point, the lower extreme of core bar be equipped with slip casting (air) export, be located between slip casting (air) and the pipe.

The pile driver main tower is hinged with the mechanical platform.

The drilling rod bin is arranged on the mechanical platform, chains are arranged on two sides of the drilling rod bin and meshed with the gears, the gears are connected with the motor, the chains on the two sides are connected with the supporting plates relatively, and a plurality of drilling rods are placed on the supporting plates.

And the mechanical platform is provided with a mechanical arm for grabbing the drill rod, and the mechanical arm is provided with a hydraulic device.

The lateral length of the counterforce wings is larger than the diameter of the drill bit.

The stirring blades are three-wing stirring blades, cross-shaped stirring blades, straight-line stirring blades or zigzag stirring blades.

And an included angle is formed between the extension line of the three-wing stirring blade and the horizontal plane.

The number ratio of the fixed wing to the bevel gear on the rotary cutter shaft is variable.

And a walking device is arranged below the mechanical platform.

The enclasping device comprises an oil cylinder and a guide device, wherein the guide device is arranged on the opposite surface of the oil cylinder which is arranged oppositely, the pistons of the two oil cylinders respectively penetrate through the guide device, and the end surfaces of the pistons are clamping surfaces for clamping a drill rod.

The beneficial effects of the invention are as follows:

1. the construction device has lower clearance height and can be constructed under the conditions of limited high requirements of existing railway lines, high-voltage lines, tunnels, bridges and culverts and the like.

2. The low-clearance soft foundation treatment stirring device has the advantages that the number ratio of the conical gears on the fixed wings to the conical gears on the rotary cutter shafts is adjusted, the rotary cutter shafts are accelerated and decelerated, stirring construction is carried out by selecting corresponding rotating speeds according to different soil textures, the defects that the rotating speed of a traditional stirring pile is low and the stirring spraying frequency can only be changed to adapt to stratum are overcome, cement soil can be effectively and quickly stirred uniformly by the low-clearance soft foundation treatment stirring device, the phenomena of sticking of clay to stirring teeth, drill rods and the like are overcome, the rotary cutting blades on the rotary cutter shafts can effectively cut soil, the process adaptability to different strata is greatly improved, pile forming quality is guaranteed, and design requirements are met.

3. The mechanical arm automatically loads and unloads the drill rod, so that the construction efficiency and the loading and unloading operation accuracy are improved; the fixed wing is singly connected with the core bar through a bearing, the core bar in the stirring drill bit is meshed with the horizontal rotary cutter shaft with the conical gear through the conical gear, so that rotary cutter blades on the rotary cutter shaft are driven to rotate in the vertical direction and jointly act with horizontal stirring of stirring blades on the stirring drill bit, the stirring function of three-dimensional intersection is realized, in addition, a gas pipe is arranged in the core bar to pump high-pressure gas into a stirring soil body, the gas explosion function is realized in the stirring soil body, three-dimensional intersection stirring is formed, the soil body and a curing agent (cement and the like) are more uniformly mixed, the adaptability to complex stratum is improved, the stirring function on a soft foundation soil body is further enhanced, the stirring efficiency is improved, the strength and the integrity of a pile body are improved, and the pile quality is greatly improved; compared with the common high-pressure rotary spraying technology under the same working condition, the mixing amount of the curing agent (cement and the like) is small, the construction cost is low, and the engineering cost can be obviously reduced.

4. The fixed wings of the low-clearance soft foundation treatment stirring device are meshed with the rotary cutter shaft through the bevel gears, and the mechanical connection mode ensures the high efficiency and reliability of the stirring function.

5. The outer diameter of the counterforce wing is larger than the diameter of the drill bit, the counterforce wing stretches into the soil body at the pile side, the counterforce wing is connected with the drill bit shell through a bearing in a single action mode, the counterforce wing does not rotate under the limiting action of the soil body at the pile side, counterforces are provided for the rotary cutter shaft on the drill bit, the rotary cutter shaft is rotated under the action of the rotary drive of the drill bit and the action of the bevel gear, so that the rotary cutter blade is driven to vertically rotate,

6. the rotary-cut drill bit with the soil counterforce changes the complicated operation of the traditional low clearance equipment that the core rod needs to be replaced.

Drawings

Fig. 1 is a schematic side view of the present invention.

Fig. 2 is a schematic elevational view of the present invention.

Fig. 3 is a schematic view of the structure of the drill bit of the present invention.

Fig. 4 is a side view of the drill rod magazine of the present invention.

Fig. 5 is a schematic elevational cross-section of a drill rod magazine of the present invention.

Fig. 6 is a schematic structural view of the hugging device according to the present invention.

Fig. 7 is a top view of fig. 6.

Wherein:

the drilling machine comprises a 1-power device, a 2-main tower, a 3-mechanical arm, a 4-drill rod bin, a 5-traveling device, a 6-height (H), a 7-enclasping device, an 8-drill bit joint, a 9-grouting, an air pipe, a 10-core rod, an 11-drill bit shell, a 12-1 conical gear 1, a 12-2-conical gear, a 13-bearing 1, a 14-conical gear 2, a 15-rotary cutting blade, a 16-rotary cutting cutter shaft, a 17-bearing 2, a 18-bearing 3, a 19-bearing 4, a 20-counter-force wing, a 21-grouting opening, a 22-three-wing stirring blade, a 23-fixed wing, a 25-mechanical platform, a 26-gear, a 27-motor, a 28-chain, a 29-drill rod, a 30-supporting plate, a 31-oil cylinder, a 32-oil pipe opening, a 33-guide device, a 34-clamping surface, a 35-oil seal, a 36-piston and a 37-connecting end with the drilling machine.

Detailed Description

Examples: the low clearance soft foundation treatment construction device comprises a pile driver main tower 2, a drill rod 29, a holding device 7 and a drill bit; the pile machine main tower 2 has a height (H) of less than 5 meters, is lower than a pile frame of a traditional cement-soil mixing pile construction machine, can be constructed under the conditions of limited high requirements such as an existing railway line, a high-voltage line, a tunnel, a bridge culvert and the like, is provided with a power device 1, the pile machine main tower 2 is hinged with a mechanical platform 25 through a pin shaft, the pile machine main tower 2 is horizontally laid or vertical to the mechanical platform 25 through a hydraulic device, the lower end of the mechanical platform 25 is provided with a travelling device 5, the construction device can be moved to a pile position in a foundation through the travelling device 5, the mechanical platform 25 is provided with a drill rod bin 4 and a holding device 7 which is used for clamping a drill rod 29 and is connected with the pile machine main tower 2, the holding device 7 comprises an oil cylinder 31 and a guide device 33, the opposite surfaces of the oppositely arranged oil cylinders 31 are provided with the guide device 33, and pistons 36 of the two oil cylinders 31 respectively penetrate through the guide device 33, and the end surfaces of the pistons 36 are used for clamping the drill rod 29; annular chains 28 are respectively arranged on two sides of the drill rod bin 4, two ends of the annular chains 28 are respectively meshed with gears 26, the gears 26 are connected with motors 27, supporting plates 30 are respectively connected to the chains 28 on two sides, a plurality of drill rods 29 are placed on the supporting plates 30, the drill rods 29 in the drill rod bin 4 are lifted or lowered through rotation of the chains 28, a mechanical arm 3 is arranged on the mechanical platform 25, a hydraulic device is arranged on the mechanical arm 3, the mechanical arm 3 is used for grabbing the drill rods 29 through the hydraulic device, the drill rods 29 are placed in the drill rod bin 4, or are transferred to a holding device 7 of a drilling machine front stage, the holding device 7 is used for holding or loosening the drill rods 29, mounting or dismounting of the drill rods 29 is achieved, the drill rods 29 are connected with a drill bit through screw threads or flanges of a drill bit joint 8, the drill bit comprises a shell 11, a core rod 10, a fixed wing 23, a counter-force wing 20, a rotary cutter shaft 16 and three-wing stirring blades 22, the fixed wing 23 is arranged in the shell 11, the lower end of the fixed wing 23 is fixedly connected with the shell 11 through a bearing 19, the lower end of the fixed wing 23 is provided with a counter-force wing 20, the counter-force wing 20 symmetrically extends towards the two sides of the fixed wing 23, the transverse length of the counter-force wing 23 is larger than the diameter of a drill bit, the cross section of the counter-force wing 23 is straight or cylindrical, during the stirring drill bit drilling process, the counter-force wing 20 on the fixed wing 23 cuts into a soil body, the fixed wing 23 does not rotate along with the drill bit due to the resistance of the soil body, a plurality of bevel gears 12-1 are sleeved on the fixed wing 23, a plurality of groups of rotary cutter shafts 16 are arranged on the wall of the shell 11, each group of rotary cutter shafts 16 are oppositely arranged, adjacent rotary cutter shafts 16 are positioned on different planes and are staggered mutually, one end of each rotary cutter shaft 16 positioned in the shell 11 is a bevel gear 12-2, the conical gears 12-1 respectively sleeved outside the fixed wings 23 are meshed with each other, the fixed wings 23 and the conical gears 12-1 and 12-2 on the rotary cutter shaft 16 have variable number ratio, play a role in increasing speed and reducing speed, adjust the rotary cutter shaft 16, select corresponding rotating speeds according to different soil properties to perform stirring construction, overcome the defects that the traditional stirring pile is low in rotating speed and can only adapt to stratum by changing stirring spraying times, the rotary cutter shaft 16 is provided with rotary cutter blades 15, the rotary cutter blades 15 are in a straight column shape or a bent column shape, the core rod 10 penetrates through the shell 11 and the fixed wings 23 from top to bottom and is connected with the fixed wings 23 in a single action manner through bearings 18, a grouting (gas) pipe 9 is arranged in the core rod 10, the grouting (gas) pipe 9 can be respectively arranged, a channel can be shared, or the hollow core rod 10 can be directly used as the grouting (gas) pipe 9, the shell 11 is welded with the upper end of the core bar 10 and can be riveted or flanged, the bottom of the core bar 10 is provided with a drill point, the core bar 10 near the drill point is connected with a three-wing stirring blade 22, an extension line of the three-wing stirring blade 22 forms an included angle with the horizontal plane, the length of the counter-force wing 20 is larger than that of the three-wing stirring blade 22, the three-wing stirring blade 22 can also be designed into a cross stirring blade or a straight stirring blade or a zigzag stirring blade, the three-wing stirring blade 22 is perpendicular to the rotary-cut blade 15, the rotary-cut blade 15 on the rotary-cut cutter shaft 16 is driven to rotate in the vertical direction under the action of the rotating force of a drill bit, meanwhile, the rotary-cut cutter shaft and the three-wing horizontal stirring blade 22 on the stirring drill bit act together with each other along with the drill rod 29, so that the rotary-cut blade 15 runs in the pile body in all directions without dead angles, the core bar 10 is provided with a grouting (gas) outlet, which is positioned between the three-wing stirring blade 22 and the drill tip, the grouting (gas) pipe 9 is connected with the grouting (gas) outlet, and the grouting (gas) outlet can be arranged oppositely and is respectively positioned on the core bar between the three-wing stirring blade 22 and the drill tip.

Working principle:

the device is moved to a pile position in a foundation through a travelling device 5, the power device 1 is started to drill to the depth of a designed pile bottom, in the process, three-wing stirring blades 22 cut soil bodies and stir in the horizontal direction, simultaneously under the counter force provided by a drill bit fixing wing 23, the conical gear 12 is meshed to drive a rotary cutting blade 15 to rotate in the vertical direction, the soil bodies are cut and stirred in the vertical direction, high-pressure gas is pumped into the soil bodies through a slurry pipe to form a gas explosion effect, and the soil bodies are stirred in an auxiliary mode, so that the soil bodies in the pile bodies are fully scattered and crushed; and (3) starting a slurry pump to spray slurry and lifting a stirring drill bit, fully and uniformly stirring cement slurry and soil under the interaction of the three-wing stirring blades 22 and the rotary-cut blades 15, lifting the drill bit to the designed pile top height, stopping spraying the slurry, drilling and stirring to the designed pile bottom depth again, and repeating the slurry spraying, stirring and lifting a drill rod to finish the construction of the cement stirring pile.

The device ensures the high efficiency and reliability of the stirring function by the mutual engagement between the conical gear 14 on the fixed wing 23 and the conical gear 12 on the rotary cutter shaft 16 in a mechanical connection mode; the rotation speed of the cutter shaft can be improved by changing the modulus ratio of the bevel gear and the rotation number of the drill rod, so that cement soil is effectively and high-speed stirred uniformly, the phenomena of sticking and stirring teeth of clay and the drill rod are overcome, the rotary cutting blades on the cutter shaft can effectively cut the soil, the process adaptability to different strata is greatly improved, the piling quality is ensured, and the design requirement is met.

The device is used for construction, the effect after construction is compared with that of the traditional process, and the result is shown in the following table:

through the comparison, the device is used for construction, and compared with other devices and methods for construction, the device has the following advantages:

1. the clearance height is low, the environmental adaptability is strong, and the construction efficiency is high

The mechanical height is greatly reduced by a rod connecting and replacing technology, the method is applicable to a clearance limited environment, and the construction can be performed on the sections such as the vicinity of the existing railway line, the vicinity of the high-voltage line, the tunnel, the bridge and culvert and the like; the novel soil counter-force rotary-cut drill bit changes the complicated operation that the core rod needs to be replaced in the traditional low-clearance equipment, and the mechanical arm automatically loads and unloads the drill rod, so that the construction efficiency and the operation accuracy are greatly improved.

2. The mechanical transmission is more advanced, and the reliability is high

The fixed wing in the stirring drill bit is meshed with the rotary cutter shaft fixed on the drill rod shell through the conical gear, and the stirring blades on the rotary cutter shaft are driven to rotate in the vertical direction under the reaction force of the fixed wing and the rotating force of the drill rod, meanwhile, the stirring blades revolve along with the core rod, the power of the stirring drill bit is provided by the pile driver, the rotating speed of the rotary cutter shaft (rotary cutter blade) can be changed through different rotating speeds of the pile driver, and the reliability is high.

3. Innovative stirring process for greatly improving pile forming quality

The counter-force wing, the vertical rotary-cut blade and the three-wing horizontal stirring blade of this device act together to realize the stirring function of three-dimensional cross, simultaneously, pump high-pressure gas into the stirring soil body through the trachea, play the gas explosion effect for soil body and curing agent (cement etc.) mix more evenly, are favorable to improving pile body intensity and integrality, promote into the stake quality by a wide margin.

4. Has stronger adaptability to different stratum

The device can fully crush soil bodies under the combined action of three-dimensional cross mixing and gas explosion, and is uniformly fused with curing agents (cement and the like), stirring is more effective, the problems that the soil bodies are large in viscosity and not easy to crush, the curing agents are unevenly mixed with the soil bodies and the like are solved, and the applicability to complex stratum is enhanced.

5. Greatly reduces engineering cost

Compared with the common high-pressure jet grouting process under the same working condition, the high-pressure jet grouting pile curing agent (cement and the like) has large mixing amount, the curing agent (cement and the like) of the device has small mixing amount, the construction cost is low, and the engineering cost can be obviously reduced.

Claims (10)

1. The utility model provides a low headroom soft foundation handles construction equipment which characterized in that: comprises a pile machine main tower, a drill rod and a drill bit; the utility model provides a pile driver main tower is last to be fixed and is used for holding the holding device of drilling rod, the drill bit is connected with the drilling rod, the drill bit includes shell, core bar, slip casting (air) pipe, fixed wing, counter-force wing, rotary cutter arbor and stirring vane, install the fixed wing in the shell, the lower extreme of fixed wing is equipped with the counter-force wing, and the counter-force wing stretches out to the fixed wing bilateral symmetry, and the suit bevel gear on the fixed wing, install multiunit rotary cutter arbor on the shell wall, every group rotary cutter arbor sets up relatively, and adjacent rotary cutter arbor is in different planes, and staggers each other, is equipped with rotary cutter blade on the rotary cutter arbor, the one end that the rotary cutter arbor is located the shell is the bevel gear, and the intermeshing with the bevel gear of outer suit of fixed wing, core bar top-down runs through shell and fixed wing to be connected with the fixed wing through the bearing, install slip casting (air) pipe in the core bar, the upper end and the core bar fixed connection of shell, the lower extreme and the fixed wing of shell are connected through the bearing, the bottom of core bar is equipped with the drill point, connect stirring vane on the core bar apart from the near the core bar of drill point, the lower extreme of core bar be equipped with slip casting (air) export, be located between slip casting (air) and the pipe.

2. The low headroom soft foundation treatment construction device according to claim 1, wherein: the pile driver main tower is hinged with the mechanical platform.

3. The low headroom soft foundation treatment construction device according to claim 2, wherein: the drilling rod bin is arranged on the mechanical platform, chains are arranged on two sides of the drilling rod bin and meshed with the gears, the gears are connected with the motor, the chains on the two sides are connected with the supporting plates relatively, and a plurality of drilling rods are placed on the supporting plates.

4. A low headroom soft foundation treatment construction device according to claim 3, wherein: and the mechanical platform is provided with a mechanical arm for grabbing the drill rod, and the mechanical arm is provided with a hydraulic device.

5. The low headroom soft foundation treatment construction device according to claim 1, wherein: the lateral length of the counterforce wings is larger than the diameter of the drill bit.

6. The low headroom soft foundation treatment construction device according to claim 1, wherein: the stirring blades are three-wing stirring blades, cross-shaped stirring blades, straight-line stirring blades or zigzag stirring blades.

7. The low headroom soft foundation treatment construction device according to claim 6, wherein: and an included angle is formed between the extension line of the three-wing stirring blade and the horizontal plane.

8. The low headroom soft foundation treatment construction device according to claim 1, wherein: the number ratio of the fixed wing to the bevel gear on the rotary cutter shaft is variable.

9. The low headroom soft foundation treatment construction device according to claim 2, wherein: and a walking device is arranged below the mechanical platform.

10. The low headroom soft foundation treatment construction device according to claim 1, wherein: the enclasping device comprises an oil cylinder and a guide device, wherein the guide device is arranged on the opposite surface of the oil cylinder which is arranged oppositely, the pistons of the two oil cylinders respectively penetrate through the guide device, and the end surfaces of the pistons are clamping surfaces for clamping a drill rod.