阅读说明：本技术 旋喷扩径螺旋挤土组合灌注桩及其成桩方法 (Rotary-spraying expanding spiral soil-squeezing combined cast-in-place pile and pile forming method thereof ) 是由 王吉强 武娜 薛桂海 杨红杰 武腾飞 邢洪真 何道圆 李洪利 于 2021-09-22 设计创作，主要内容包括：本发明提供旋喷扩径螺旋挤土组合灌注桩及其成桩方法,涉及建筑施工技术领域。该旋喷扩径螺旋挤土组合灌注桩及其成桩方法,包括以下步骤：第一步,施工地地质检测；第二步、钻具偏移理论校正；第三步,模拟装入钢筋笼；第四步,模拟灌注。本发明中通过对施工地的地质进行充分分析,并将地质特征结合计算机技术进行实况模拟,并且通过发明步骤中的解决方案,可以有效避免钻偏、钢筋上浮、堵管、桩体断裂以及孔坍塌等问题,在模拟达到相关施工规范后再进行实施,防止了返工情况的产生。(The invention provides a jet grouting expanded diameter spiral soil squeezing combined cast-in-place pile and a pile forming method thereof, relating to the technical field of building construction. The jet grouting expanding spiral soil-squeezing combined cast-in-place pile and the pile forming method thereof comprise the following steps: firstly, geological detection of a construction site; secondly, correcting the drilling tool offset theory; step three, simulating and loading the steel reinforcement cage; and fourthly, simulating perfusion. According to the invention, the geology of the construction site is fully analyzed, the geological characteristics are combined with the computer technology for live simulation, and the problems of drilling deviation, steel bar floating, pipe blocking, pile body fracture, hole collapse and the like can be effectively avoided through the solution in the steps of the invention, and the simulation is implemented after reaching the relevant construction specifications, so that the occurrence of rework condition is prevented.)

1. The jet grouting expanding spiral soil-squeezing combined cast-in-place pile and the pile-forming method thereof are characterized in that: the method comprises the following steps:

the first step is as follows: construction site geology detection

The method comprises the steps of detecting geological features of a construction site, analyzing soil layer distribution of drilling positions from top to bottom, generating geological feature simulation images of the drilling positions according to obtained data, then drilling holes on a computer by using a simulated drilling machine in combination with the geological features, analyzing the positions of deviation of the drilling tool in the process, and stripping the geological features from the positions, wherein a rotating rod part of the drilling machine is double-layered, the drilling tool of the drilling machine is characterized in that a spiral lug is arranged on the side wall of a drill bit connecting the drilling rod position, two symmetrical rotary spray holes are arranged between the intervals of the spiral lugs, a rotary adjusting sleeve is rotatably connected between the head of the drill bit and the spiral lug on the side wall of the drill bit, the lower side surface of the rotary adjusting is inclined outwards, and a spray adjusting hole is arranged at the inclined plane;

the second step is that: theoretical correction of drilling tool offset

Whether the hole wall position meets the rock is obtained from the stripped geological feature simulation image, the type, the block size and the coincidence degree of the rock and the drilled hole are obtained after analysis, then, a drilling tool is used for reducing the jet grouting radius from the side with the maximum coincidence degree with the rock, and the jet grouting adjusting hole jets air downwards from the side with the small coincidence degree, the position of the jet grouting adjusting hole is kept unchanged after the jet grouting adjusting hole is drilled below the rock, the jet pressure of the jet grouting hole on the side coincident with the rock is increased, the jet grouting adjusting hole is lowered, so that the diameter expansion can be completed below the rock, and the radius in the range of the jet grouting height on the other side is reduced;

the third step: simulated loading reinforcement cage

The method comprises the steps of sucking soil scraps from the middle part of a drilling tool, finishing hole cleaning, moving up the drilling tool from a rotary jet hole to spray slurry, moving a reinforcement cage down the top of a hole to be brought into the drilled hole, selecting whether to spray the slurry for the second time according to the thickness of the slurry sprayed last time in the process, thickening the slurry in the 30-45-degree range of a deviation side by the drilling tool to spray the slurry if the reinforcement cage deviates in the process, and stopping spraying the rotary jet hole on the other side until the reinforcement cage returns to the vertical state to return to the initial working state;

the fourth step: simulated perfusion

And (3) spraying concrete from the bottom of the drilling tool, gradually moving the drilling tool upwards in the process, sucking air from the bottoms of the two rotary spraying holes upwards in a mode of gradually descending the suction force, and performing field construction after the simulation is completed.

2. The jet grouting and expanding spiral soil-squeezing combined cast-in-place pile and the pile forming method thereof as claimed in claim 1, wherein: and the two rotary spraying holes are respectively connected with a pipeline, and the pipeline is positioned between the two layers of the rotating rod.

3. The jet grouting and expanding spiral soil-squeezing combined cast-in-place pile and the pile forming method thereof as claimed in claim 1, wherein: the inside of the rotation adjusting sleeve is provided with a channel connected with the ejection adjusting hole, and the inside of the rotation adjusting sleeve is provided with power for rotating the rotation adjusting sleeve.

4. The jet grouting and expanding spiral soil-squeezing combined cast-in-place pile and the pile forming method thereof as claimed in claim 1, wherein: the drilling tool rotating rod is internally provided with a pipeline for spraying high-pressure gas, and the lower end of the pipeline is connected with a channel in the rotating adjusting sleeve and is positioned between the two layers of the rotating rod.

5. The jet grouting and expanding spiral soil-squeezing combined cast-in-place pile and the pile forming method thereof as claimed in claim 1, wherein: and the end part of the drilling tool is strictly prevented from moving out of the concrete surface during the pouring, and the ejection adjusting hole is controlled to be positioned at a position of 1-3 mm of the concrete surface.

6. The jet grouting and expanding spiral soil-squeezing combined cast-in-place pile and the pile forming method thereof as claimed in claim 1, wherein: and the top of the drill hole is filled into the protective cylinder during downward rotation, and the protective cylinder is pulled out after the completion of pouring.

Technical Field

The invention relates to the technical field of building construction, in particular to a jet grouting expanded diameter spiral soil-squeezing combined cast-in-place pile and a pile forming method thereof.

Background

The cast-in-place pile is a pile formed by forming a hole in place and pouring concrete or reinforced concrete. Commonly used are: (1) drilling a cast-in-place pile: the pile is formed by using a spiral drilling machine, a diving drilling machine and the like to form holes on site and pouring concrete, and the construction has no vibration and does not squeeze soil, but the settlement amount of the pile is slightly larger. The large-diameter cast-in-situ bored pile popularized and applied in large-scale projects such as high-rise buildings, bridges and the like is constructed by the method, the diameter of the pile is more than 1m, the bottom of the pile can be expanded, and the bearing capacity of a single pile can reach thousands of tons. (2) Sinking a pipe and pouring a pile: the steel pipe with reinforced concrete pile shoe (pile tip) or valve type pile shoe is sunk into the soil by hammering or vibration, then concrete is poured in and the pipe is pulled out simultaneously to form the pile. Hammering the cast-in-place pile by a hammer for sinking and pulling the pipe; the vibrating pipe sinking and pipe drawing of the vibration exciter is called a vibrating cast-in-place pile. The method is easy to cause the defects of pile breaking, necking, foot hanging pile, pile shoe water inlet, mud inlet and the like, and the inspection and the timely treatment are noticed during the construction. In addition, explosive expanding cast-in-place piles are provided, which are formed by expanding the bottom of a pile hole with explosive to increase the bearing capacity.

Due to the geological reasons of specific construction sites, the drilling deviation condition is inevitably generated in the drilling process, the later-stage construction engineering is greatly influenced once the drilling deviation occurs, and the situations of steel bar floating, pipe blockage, pile body fracture and hole collapse can also occur in the daily construction process, so that the problems are urgently needed to be solved.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a jet grouting expanding spiral soil-squeezing combined cast-in-place pile and a pile forming method thereof, which solve the problems that the deviation of drilling, the upward floating of reinforcing steel bars, the pipe blockage, the breakage of a pile body and the collapse of holes are generated in the construction process and cannot be effectively avoided in the construction process.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme: a jet grouting expanding spiral soil-squeezing combined cast-in-place pile and a pile forming method thereof comprise the following steps:

the first step is as follows: construction site geology detection

The method comprises the steps of detecting geological features of a construction site, analyzing soil layer distribution of drilling positions from top to bottom, generating geological feature simulation images of the drilling positions according to obtained data, then drilling holes on a computer by using a simulated drilling machine in combination with the geological features, analyzing the positions of deviation of the drilling tool in the process, and stripping the geological features from the positions, wherein a rotating rod part of the drilling machine is double-layered, the drilling tool of the drilling machine is characterized in that a spiral lug is arranged on the side wall of a drill bit connecting the drilling rod position, two symmetrical rotary spray holes are arranged between the intervals of the spiral lugs, a rotary adjusting sleeve is rotatably connected between the head of the drill bit and the spiral lug on the side wall of the drill bit, the lower side surface of the rotary adjusting is inclined outwards, and a spray adjusting hole is arranged at the inclined plane;

the second step is that: theoretical correction of drilling tool offset

Whether the hole wall position meets the rock is obtained from the stripped geological feature simulation image, the type, the block size and the coincidence degree of the rock and the drilled hole are obtained after analysis, then, a drilling tool is used for reducing the jet grouting radius from the side with the maximum coincidence degree with the rock, and the jet grouting adjusting hole jets air downwards from the side with the small coincidence degree, the position of the jet grouting adjusting hole is kept unchanged after the jet grouting adjusting hole is drilled below the rock, the jet pressure of the jet grouting hole on the side coincident with the rock is increased, the jet grouting adjusting hole is lowered, so that the diameter expansion can be completed below the rock, and the radius in the range of the jet grouting height on the other side is reduced;

the third step: simulated loading reinforcement cage

After soil scraps are sucked out from the middle part of the drilling tool and hole cleaning is completed, then, slurry is sprayed out from the rotary spraying hole along with the drilling tool, then the reinforcement cage moves downwards along with the drilling tool from the top of the hole and is brought into the drilled hole, whether the slurry is sprayed out for the second time or not is selected according to the thickness of the slurry sprayed out last time in the process, if the reinforcement cage deviates in the process, the slurry is thickened and sprayed out by the drilling tool in the range of 30-45 degrees of the deviation side, and the rotary spraying hole on the other side stops spraying until the reinforcement cage returns to the vertical state and returns to the initial working state;

the fourth step: simulated perfusion

And (3) spraying concrete from the bottom of the drilling tool, gradually moving the drilling tool upwards in the process, sucking air from the bottoms of the two rotary spraying holes upwards in a mode of gradually descending the suction force, and performing field construction after the simulation is completed.

Preferably, the two rotary spraying holes are respectively connected with a pipeline, and the pipeline is positioned between the two layers of the rotating rod.

Preferably, a channel connected with the ejection adjusting hole is arranged in the rotation adjusting sleeve, and power for rotation of the rotation adjusting sleeve is arranged in the rotation adjusting sleeve.

Preferably, a pipeline for spraying high-pressure gas is arranged inside the rotating rod of the drilling tool, and the lower end of the pipeline is connected with a channel in the rotating adjusting sleeve and is positioned between the two layers of the rotating rod.

Preferably, the end part of the drilling tool is strictly prevented from moving out of the concrete surface during the pouring, and the ejection adjusting hole is controlled to be located 1-3 mm away from the concrete surface.

Preferably, the top of the drill hole is filled into the casing during downward rotation, and the casing is pulled out after the completion of pouring.

(III) advantageous effects

The invention provides a jet grouting expanding spiral soil squeezing combined cast-in-place pile and a pile forming method thereof. The method has the following beneficial effects:

according to the invention, the geology of the construction site is fully analyzed, the geological characteristics are combined with the computer technology for live simulation, and the problems of drilling deviation, steel bar floating, pipe blocking, pile body fracture, hole collapse and the like can be effectively avoided through the solution in the steps of the invention, and the simulation is implemented after reaching the relevant construction specifications, so that the occurrence of rework condition is prevented.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example (b):

the embodiment of the invention provides a jet grouting expanded diameter spiral soil-squeezing combined cast-in-place pile and a pile forming method thereof, wherein the method comprises the following steps:

the first step is as follows: construction site geology detection

The geological features of a construction site are detected, the soil layer distribution of the drilling positions from top to bottom is analyzed, the obtained data is generated into a geological feature simulation image of the drilling positions, the distribution of soil and rocks at the drilling positions of the construction site can be analyzed according to the geological feature simulation image, then the drilling is carried out on a computer by using a simulated drilling machine in combination with the geological features, the position of a drilling tool for deviation is analyzed in the process and is stripped through the geological features at the position, the deviation is generated because of the resistance effect of the rocks on the drilling tool, the rotating rod part of the drilling machine is double-layer and is divided into an outer pipe and an inner pipe, the inner pipe is used for absorbing soil scraps and pouring concrete, the drilling tool of the drilling machine is provided with a spiral lug on the side wall of the position where a drill bit is connected with the drilling rod, two symmetrical rotary spray holes are arranged between the intervals of the spiral lugs, and are respectively connected with a pipeline, the pipeline is positioned between the two layers of the rotating rod, a rotating adjusting sleeve is rotatably connected between the side wall of the drill bit and the head of the drill bit and the spiral convex block, the lower side surface of the rotating adjusting sleeve inclines outwards, the inclined surface is provided with a spraying adjusting hole, a channel connected with the spraying adjusting hole is arranged in the rotating adjusting sleeve, power for self rotation is arranged in the rotating adjusting sleeve, the spraying adjusting hole can rotate along with the rotating adjusting sleeve after the rotating adjusting sleeve rotates, but the spraying adjusting hole is still connected with the channel, the rotating rod of the drilling tool is internally provided with a pipeline for spraying high-pressure gas, the lower end of the pipeline is connected to the channel in the rotating adjusting sleeve and positioned between the two layers of the rotating rod, and after the spraying of the spraying adjusting hole, the air pressure in the inner pipe is increased due to the blocking effect of the bottom of the drill hole, and the suction of soil scraps can be promoted;

the second step is that: theoretical correction of drilling tool offset

Whether the hole wall position meets the rock is obtained from the stripped geological feature simulation image, the type, block particle size and coincidence degree with a drilled hole are obtained after analysis, if the rock is small and the large diameter is larger than the diameter of the inner pipe, a drilling tool is arranged to hover for 2-3 minutes, the rock and the spiral bump are changed into small particles, so that the rock and the spiral bump are convenient to suck out, the pipe blocking is avoided, then the rotary jetting radius is reduced from the side with the largest coincidence degree with the rock by using the drilling tool, the jetting adjusting hole rotates to the side with the small coincidence degree under the action of the internal power of the rotary adjusting sleeve, then the gas is jetted downwards, the position of the jetting adjusting hole is kept unchanged after the rock is drilled, the jetting pressure of the rotary jetting hole at the side coincident with the rock is improved, the other side is reduced, so that the hole expansion can be completed under the rock, the radius in the range of the jetting height at the other side is reduced, due to the change of the radius of the rock position, the resistance of the rock pushes the steel reinforcement cage to float upwards, the space under the rock after expanding diameter can contain concrete, and the space can also be a yielding space in which the solidified concrete and the rock deform after being vibrated;

the third step: simulated loading reinforcement cage

After soil scraps are sucked out from an inner pipe in the middle of a drilling tool to complete hole cleaning, the inner pipe is sucked in from the middle of a drill bit, then slurry is sprayed out from a rotary spraying hole along with the drilling tool, a reinforcement cage moves downwards along with the drilling tool from the top of the hole and is brought into the drilled hole, whether the slurry is sprayed out for the second time or not is selected according to the thickness of the slurry sprayed out last time in the process, the slurry is sprayed for the second time after the thickness of the slurry does not meet related construction requirements, if the reinforcement cage deviates in the process, the slurry is thickened and sprayed out by the drilling tool within a range of 30-45 degrees of the deviated side, the rotary spraying hole on the other side stops spraying until the reinforcement cage returns to the vertical state to return to the initial working state;

the fourth step: simulated perfusion

The concrete is sprayed out of the bottom of the drilling tool, the drilling tool gradually moves upwards in the process, air suction is performed at the two rotary spraying holes from the bottom of the hole upwards in a mode of gradually descending the suction force, accordingly, air in the concrete can be promoted to be discharged, the end portion of the drilling tool is strictly moved out of the surface of the concrete during pouring, the spraying adjusting hole is controlled to be located at a position 1-3 mm away from the surface of the concrete, and field construction is performed after simulation is completed.

And (4) loading the top of the drill hole into a protective cylinder during downward rotation, and pulling out the protective cylinder after the completion of pouring.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.