CN213448440U

CN213448440U - Construction molding equipment of controllable undergauge of soft soil layer CFG stake

Info

Publication number: CN213448440U
Application number: CN202022159598.2U
Authority: CN
Inventors: 张予强; 宋晓松; 张俊征; 许华青; 仝元通; 贾富利; 郝以顺
Original assignee: Zhonghua Geotechnical Zhengzhou Geotechnical Engineering Co ltd
Current assignee: Sinochem geology Henan Bureau Group Co.,Ltd.
Priority date: 2020-09-28
Filing date: 2020-09-28
Publication date: 2021-06-15
Anticipated expiration: 2030-09-28

Abstract

The utility model relates to a CFG pile construction field, in particular to a construction forming device for a soft soil layer CFG pile with controllable hole shrinkage, which comprises a CFG pile driver and an auger mechanism, wherein the CFG pile driver comprises a vehicle-mounted platform, a rotating frame, a power head and a concrete pipe; the auger mechanism comprises a hollow auger stem and a drill bit, a controllable necking mechanism is arranged on the auger mechanism, the controllable necking mechanism comprises a telescopic pile casing, a stopping mechanism and a triggering mechanism, and the telescopic pile casing is sleeved at the rear side section of the drill bit; the blocking mechanism is arranged at the lower part of the drill bit and plays a role in limiting and blocking the bottom end of the nested casing in a folded state; the trigger mechanism is connected with the stopping mechanism through the transmission rope, the construction forming equipment can stabilize the pressure-grouting concrete space, prevent the secondary damage of high pump pressure to the soil body, effectively prevent the diameter shrinkage, effectively avoid the air suction effect to form the phenomenon that the pile body clamps the mud, and effectively guarantee the pressure-grouting integrity and continuity.

Description

Construction molding equipment of controllable undergauge of soft soil layer CFG stake

Technical Field

The utility model relates to a CFG stake construction field specifically says so a construction former of controllable undergauge of soft soil layer CFG stake.

Background

The CFG pile is also called cement fly ash gravel pile, is made up by mixing broken stone, fly ash, sand and cement with water and making pile by using various construction machines or modes. The CFG pile has the characteristics and advantages of small environmental pollution, low manufacturing cost and convenient construction, and the single concrete provides high bearing capacity, and is widely applied to composite foundations of industrial and civil buildings. In the CFG pile construction, a plurality of construction areas widely have soft soil layers, the soft soil comprises silt, mucky soil, peat and peat soil, most of the physical characteristics are saturated, the soil contains organic matters, and the natural water content is greater than the liquid limit; (2) the shear strength is very low; (3) the compressibility is high; (4) the permeability is very small; (5) has obvious structural property. Soft soils are generally of a flocculent structure, which, once disturbed, have a significantly reduced strength and even a flowing state. The sensitivity of soft soil is generally 4-10, and the soft soil belongs to high-sensitivity soil. Therefore, foundation treatment is carried out in the soft soil layer, if the structure of disturbance soil is not avoided, soil deformation is aggravated, the strength of foundation soil is reduced, and the foundation treatment effect is influenced; (6) has obvious rheological property. Under the action of load, the soft soil bears the action of shear stress to generate slow shear deformation, and possibly to cause the attenuation of shear strength, considerable secondary consolidation settlement can be generated after the primary consolidation settlement is finished, and in conclusion, during the construction of the CFG pile, the shrinkage or pile breakage of the pile body of the soft soil layer section is easy to happen, the bearing capacity of a single pile is influenced, the CFG pile is an engineering root engineering item, the bearing capacity of the single pile does not meet the requirement, and the whole engineering quality is influenced badly, according to the statistical data of the past company project data, the total unqualified rate of the CFG pile is 19.84 percent, the diameter-reducing unqualified rate is 16.50 percent, wherein the diameter-reducing defective rate accounts for 83.17% of the total defective rate, therefore, the probability of generating the diameter-reducing defect of the CFG pile is very high, therefore, how to overcome the above technical problems and defects becomes a problem which is urgently needed and needs to be solved in the industry.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an invention aim at overcomes the defect that describes in the background art to realize the construction former of the controllable undergauge of soft soil layer CFG stake, this construction former can stabilize pressure concrete filling space, prevent that high pump pressure from to the secondary destruction of the soil body, effectively prevent the undergauge, can also effectively avoid the air suction effect to form the pile body and press from both sides the mud phenomenon, guarantee effectively that pressure is irritated wholeness, continuity, finally can show improvement pile-forming quality, guarantee single pile bearing capacity and compound ground bearing capacity eigenvalue requirement.

In order to achieve the purpose of the invention, the technical scheme of the utility model is as follows: a construction forming device capable of controlling hole shrinkage of a CFG pile in a soft soil layer comprises a CFG pile driver and an auger mechanism, wherein the CFG pile driver comprises a vehicle-mounted platform, a rotating frame, a power head and a concrete pipe, the rotating frame is arranged at the tail end of the vehicle-mounted platform in a turnover and hinged mode, the vehicle-mounted platform of the CFG pile driver is preferably a crawler-type engineering platform, the power head is arranged on the rotating frame in a sliding mode, and the tail end of the concrete pipe is communicated with the top end of the auger mechanism in a rotating mode; the spiral drilling mechanism comprises a hollow spiral drilling rod and a drill bit, the upper end of the spiral drilling rod is fixedly connected with the power head, the lower end of the spiral drilling rod is fixed and communicated with the drill bit, a controllable necking mechanism is arranged on the spiral drilling mechanism, the controllable necking mechanism comprises a nesting protective cylinder, a stopping mechanism and a triggering mechanism, the nesting protective cylinder is sleeved at the rear side section of the drill bit and is formed by nesting a plurality of concentric cylinders, and the minimum inner diameter of the nesting protective cylinder is larger than the outer diameter of the drill bit; the blocking mechanism is arranged at the lower part of the drill bit and plays a role in limiting and blocking the bottom end of the nested casing in a folded state; the trigger mechanism is arranged at an exhaust pipe opening of the power head, the trigger mechanism is connected with the blocking mechanism through a transmission rope, and the transmission rope is realized by a steel wire rope in the embodiment.

Further, the trigger mechanism comprises a telescopic drive, the telescopic drive is a winding motor or an electric telescopic rod, the telescopic drive is fixedly arranged at an exhaust pipe opening of the power head and is connected with the top end of a transmission rope, and the telescopic drive drives the blocking mechanism to act through the transmission rope.

Furthermore, the blocking mechanism comprises blocking turning plates which are uniformly distributed on the side wall of the drill bit in the circumferential direction, the middle parts of the blocking turning plates are hinged, the outer ends of the blocking turning plates extend out of the side wall of the drill bit, the inner ends of the blocking turning plates are hinged with the tail end of the transmission rope, and the length of the outer ends of the blocking turning plates, which extend out of the drill bit, is not less than the total thickness of the nested protective cylinder in the nested state.

Further, the intussusception protects a section of thick bamboo and includes a plurality of nestification concentric metal drum together, and sets up spacing arch in the juncture after two adjacent sleeves expand, the innermost side drum of intussusception protecting a section of thick bamboo fixed set up in the drill bit rear side section.

Further, the intussusception pile casing contains 3-4 metal cylinders, and the height of individual metal cylinder is not more than 30cm, the total length of the intussusception pile casing after being unfolded completely is not less than 80cm, and the thickness of the soft soil layer can be completely covered after the intussusception pile casing is unfolded.

The utility model discloses a construction former's of controllable undergauge of soft soil layer CFG stake beneficial effect:

1. the utility model discloses a construction former of the controllable undergauge of soft soil layer CFG stake can guarantee soft soil layer CFG stake pile body quality, effectively prevents the undergauge, stops because of the unqualified stake that the necking down leads to, reduces and mends a stake probability, reduces engineering cost, because of once forming a stake, has also accelerated engineering efficiency greatly.

2. The utility model discloses a construction former of controllable undergauge of soft soil layer CFG stake improves the drill bit structure, and the side adds establishes the intussusception and protects a section of thick bamboo, and the intussusception protects a section of thick bamboo and opens the back at soft soil layer, can effectively prevent to take place on the basis of undergauge, can also stabilize and press the concrete space of pouring into, prevents that the secondary that spun concrete caused the soil body in the concrete pipe from destroying.

3. The utility model discloses a construction former of controllable undergauge of soft soil layer CFG stake can effectively prevent to take place on the basis of undergauge, can also effectively avoid the air suction effect to form the pile body and press from both sides mud phenomenon, guarantees effectively to press and irritates wholeness, continuity, finally can show to improve and become the stake quality, guarantees single stake bearing capacity and composite foundation bearing capacity eigenvalue requirement.

Drawings

Fig. 1 is a schematic view of the working state of the diameter-reducing controllable construction forming equipment for the soft soil layer CFG pile of the present invention;

fig. 2 is a schematic structural diagram of a power head part of the construction forming equipment for controlling the diameter reduction of the soft soil layer CFG pile of the invention;

FIG. 3 is one of the schematic structural diagrams of the drill part of the construction forming equipment for diameter-reducing controllable soft soil CFG pile of the present invention;

fig. 4 is a second schematic structural diagram of the drill part of the construction forming equipment for controlling the diameter reduction of the soft soil layer CFG pile of the present invention.

In the figure: 1-vehicle platform, 2-rotating frame, 3-power head, 4-concrete pipe, 5-auger stem, 6-drill bit, 7-controllable necking mechanism, 701-intussusception casing, 702-stopping mechanism, 703-triggering mechanism, 8-transmission rope and 9-pile hole.

Detailed Description

The construction forming equipment for the controllable reducing of the soft soil layer CFG pile of the present invention is described in more detail with reference to the accompanying drawings and specific embodiments.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Referring to fig. 1, the construction forming equipment for diameter-controllable reducing of a soft soil layer CFG pile of the embodiment can stabilize a pressure-poured concrete space, prevent secondary damage of a high pump pressure to a soil body, effectively prevent diameter reduction, effectively avoid a pile body mud clamping phenomenon formed by an air suction effect, effectively ensure the integrity and continuity of pressure pouring, finally remarkably improve pile-forming quality, and ensure the requirements of a single pile bearing capacity and a composite foundation bearing capacity characteristic value, which mainly comprises a CFG pile driver and an auger mechanism, wherein the CFG pile driver comprises a vehicle-mounted platform, a rotating frame, a power head and a concrete pipe, the rotating frame can be hinged at the tail end of the vehicle-mounted platform in a turnover mode, the vehicle-mounted platform of the CFG pile driver is preferably a crawler-type engineering platform, the power head is arranged on the rotating frame in a sliding mode, and the tail end of the concrete pipe is rotationally communicated with the top end of the spiral drilling mechanism and is used for pumping liquid concrete into the drilled pile pit.

Referring to fig. 3 and 4, in the present embodiment, the auger mechanism includes a hollow auger stem and a drill bit, an upper end of the auger stem is fixedly connected to the power head, a lower end of the auger stem is fixedly communicated with the drill bit, and the auger mechanism is provided with a controllable necking mechanism. The controllable necking mechanism comprises a telescopic pile casing, a blocking mechanism and a triggering mechanism, the telescopic pile casing is sleeved at the rear side section of the drill bit, the telescopic pile casing is formed by nesting a plurality of concentric cylinders, and the minimum inner diameter of the telescopic pile casing is larger than the outer diameter of the drill bit. Because the actual diameter of the drilled hole is obviously larger than that of the auger rod due to factors such as verticality, shaking of a vehicle-mounted platform and a rotating frame and the like when the auger drills downwards, the gap is just used for arranging the telescopic casing, and redundant gaps are left. The nested pile casing comprises a plurality of concentric metal cylinders which are nested together, a limiting bulge is arranged at the junction of two adjacent sleeves after being unfolded, the innermost cylinder of the nested pile casing is fixedly arranged at the rear side section of the drill bit, the innermost pile casing can be fixed through a hollowed-out support, the gap width of the support is larger than the thickness of the drill bit spiral, and soil can be conveniently discharged upwards; the intussusception protects a section of thick bamboo and includes 3 metal drum, and single metal drum's height is 30cm, total length after the intussusception protects a section of thick bamboo and expand completely is not less than 85cm, guarantees that the intussusception protects a thickness that can cover the soft soil layer after the section of thick bamboo expands completely.

In this embodiment, referring to fig. 3, the blocking mechanism is disposed at the lower portion of the drill bit, and the blocking mechanism plays a role of limiting and blocking the bottom end of the nested casing in a folded state, specifically, in this embodiment, the blocking mechanism includes blocking turning plates uniformly circumferentially disposed at the side wall of the drill bit, the middle portions of the blocking turning plates are hinged, the outer ends of the blocking turning plates extend out of the side wall of the drill bit, the inner ends of the blocking turning plates are hinged with the end of the transmission rope, the length of the outer ends of the blocking turning plates extending out of the drill bit is not less than the total thickness of the nested casing in the nested state, of course, the structure of the blocking mechanism can be multiple and various, as long as the blocking of the bottom of the nested casing is achieved, the openable and the limiting of the bottom of the nested casing is a simple deformation of the structure, and.

Referring to fig. 2, in the present embodiment, the triggering mechanism is disposed at an exhaust pipe port of the power head, and the triggering mechanism and the blocking mechanism are connected by a transmission rope. The trigger mechanism comprises a telescopic drive, the telescopic drive is a winch motor or an electric telescopic rod, the telescopic drive is fixedly arranged at an exhaust pipe opening of the power head and is connected with the top end of a transmission rope, and the telescopic drive drives the blocking mechanism to act through the transmission rope.

The utility model discloses a construction former's of controllable undergauge of soft soil layer CFG stake theory of operation: according to the mechanical structure and the construction principle of CFG equipment, the wall protection process is adopted when a long spiral drill sinks, the process is difficult to achieve, but when the drill is lifted and the pressure is poured, the nested casing is arranged on the side of a drill bit, the concrete can be stably poured and the diameter can be expanded, when the drill bit and a drill rod drill to the designed depth, the drill bit mechanism starts to be lifted upwards, and meanwhile, the concrete pipe starts to inject the rapid-setting concrete into a pile hole through a hollow spiral drill rod, namely, the drill lifting stage is started, when the action of the trigger mechanism is controlled at a certain position away from the bottom of a soft soil layer, the trigger mechanism drives the arresting mechanism to act, and finally, a plurality of segmented casing of the nested casing is opened, and in the lifting process of the spiral drill rod, the nested casing is also rubbed with the inner wall of the pile hole, so that; at the moment, pressure-grouting quick-setting concrete is sent into the pile casing, the drill lifting speed is reduced, the CFG pile is solidified while pressure-grouting until the soft soil layer completely passes through, and finally, an auger mechanism with the expanded, nested and pile casing is lifted out of a pile hole, so that the pile forming operation is completed. And (4) washing the inside and the outside of the spiral drilling mechanism and the telescopic protection barrel, recovering the telescopic protection barrel to the telescopic state, and circularly constructing when the next pile is drilled.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of the terms "a" or "an" and the like in the description and in the claims of this application do not necessarily denote a limitation of quantity. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

The exemplary embodiments of the present invention have been described in detail with reference to the preferred embodiments, however, it will be understood by those skilled in the art that various modifications and changes may be made to the specific embodiments without departing from the concept of the present invention, and various combinations of the technical features and structures of the present invention may be implemented without departing from the scope of the present invention.

Claims

1. A construction forming device capable of controlling diameter shrinkage of a CFG pile in a soft soil layer comprises a CFG pile driver and an auger mechanism, wherein the CFG pile driver comprises a vehicle-mounted platform, a rotating frame, a power head and a concrete pipe, the rotating frame is arranged at the tail end of the vehicle-mounted platform in a turnover and hinged mode, the power head is arranged on the rotating frame in a sliding mode, and the tail end of the concrete pipe is communicated with the top end of the auger mechanism in a rotating mode; the auger mechanism comprises a hollow auger stem and a drill bit, the upper end of the auger stem is fixedly connected with the power head, and the lower end of the auger stem is fixed and communicated with the drill bit, and is characterized in that: the controllable necking mechanism is arranged on the auger mechanism and comprises a telescopic pile casing, a stopping mechanism and a triggering mechanism, the telescopic pile casing is sleeved at the rear side section of the drill bit and is formed by nesting a plurality of concentric cylinders, and the minimum inner diameter of the telescopic pile casing is larger than the outer diameter of the drill bit; the blocking mechanism is arranged at the lower part of the drill bit and plays a role in limiting and blocking the bottom end of the nested casing in a folded state; the trigger mechanism is arranged at an exhaust pipe opening of the power head, and the trigger mechanism is connected with the blocking mechanism through a transmission rope.

2. The soft soil layer CFG pile diameter-reducing-controllable construction forming equipment as claimed in claim 1, wherein: the trigger mechanism comprises a telescopic drive, the telescopic drive is a winch motor or an electric telescopic rod, the telescopic drive is fixedly arranged at an exhaust pipe opening of the power head and is connected with the top end of a transmission rope, and the telescopic drive drives the blocking mechanism to act through the transmission rope.

3. The soft soil layer CFG pile diameter-reducing-controllable construction forming equipment as claimed in claim 1, wherein: the stopping mechanism comprises stopping turning plates which are uniformly distributed on the side wall of the drill bit in the circumferential direction, the middle parts of the stopping turning plates are hinged, the outer side ends of the stopping turning plates extend out of the side wall of the drill bit, the inner side ends of the stopping turning plates are hinged with the tail end of the transmission rope, and the length of the outer side ends of the stopping turning plates extending out of the drill bit is not less than the total thickness of the nested protective cylinder in the nested state.

4. The soft soil layer CFG pile diameter-reducing-controllable construction forming equipment as claimed in claim 1, wherein: the intussusception protects a section of thick bamboo and includes a plurality of nestification concentric metal drums together, and the juncture after two adjacent sleeves expand sets up spacing arch, the intussusception protects the inboard drum of a section of thick bamboo and fixes and set up in drill bit rear side section.

5. The soft soil layer CFG pile diameter-reducing-controllable construction forming equipment as claimed in claim 4, wherein: the nested casing comprises 3-4 metal cylinders, the height of each metal cylinder is not more than 30cm, and the total length of the nested casing after complete expansion is not less than 80 cm.

6. The construction forming equipment for the controllable reducing of the soft soil layer CFG pile according to any one of claims 1 to 5, which is characterized in that: the vehicle-mounted platform of the CFG pile driver is a crawler-type engineering platform.