阅读说明：本技术 三重管三高压旋喷桩施工方法 (Triple-pipe three-high-pressure jet grouting pile construction method ) 是由 赵建军 于 2018-06-20 设计创作，主要内容包括：本发明涉及一种三重管三高压旋喷桩施工方法,属于建筑工程领域,包括以下步骤：第一步、测量放线定位：根据设计的施工图测量并放出施工轴线；第二步、引钻钻机就位：将钻机安置在设计桩位上,使钻机的钻头对准桩位中心；第三步、钻进护壁成孔：钻机钻进成孔,并利用泥浆护壁,直至孔深达设计标高；第四步、注浆旋喷管的底端分别开设有出浆口、出水口以及出气口,出气口喷出的风的压力值处于1.6～2.2MPa之间,出水口位于出浆口以及出气口的上方,在喷射注浆管进行注浆的同时,旋喷注浆管上的出水口对钻孔进行水洗扩孔；第五步、冲洗；第六步、移动机具。本发明其具使注浆管与孔壁间留有较大间隙,便于孔内压力释放；降低高压水压力。(The invention relates to a construction method of a triple-pipe three-high-pressure jet grouting pile, which belongs to the field of constructional engineering and comprises the following steps: firstly, measuring and setting-out positioning: measuring and releasing a construction axis according to a designed construction drawing; secondly, guiding the drill rig to be in place: arranging a drilling machine on the designed pile position, and aligning a drill bit of the drilling machine to the center of the pile position; thirdly, drilling a protecting wall to form holes: drilling by a drilling machine to form a hole, and protecting the wall by using slurry until the depth of the hole reaches the designed elevation; fourthly, a grout outlet, a water outlet and a gas outlet are respectively formed in the bottom end of the grouting rotary spraying pipe, the pressure value of wind sprayed out of the gas outlet is between 1.6 and 2.2MPa, the water outlet is located above the grout outlet and the gas outlet, and when grouting is carried out on the grouting pipe, the water outlet in the grouting rotary spraying pipe is used for washing and reaming the drilled hole; fifthly, washing; and sixthly, moving the machine tool. The invention can leave a larger gap between the grouting pipe and the hole wall, thereby facilitating the pressure release in the hole; the high pressure water pressure is reduced.)

1. A construction method of a triple-pipe three-high pressure jet grouting pile is characterized by comprising the following steps: the method comprises the following steps:

firstly, measuring and setting-out positioning: measuring and releasing a construction axis according to a designed construction drawing;

secondly, guiding the drill rig to be in place: arranging the drilling machine (1) on a designed pile position, and aligning a drill bit of the drilling machine (1) to the center of the pile position; meanwhile, the drilling machine (1) is horizontally adjusted, so that the axis of a drill rod of the drilling machine (1) is vertically aligned with the center position of a drilled hole;

thirdly, drilling a protecting wall to form holes: drilling by a drilling machine (1) to form a hole, and protecting the wall by using slurry until the hole depth reaches the designed elevation of the hole depth, wherein the hole diameter is larger than the outer diameter of the jet grouting pipe (6);

fourthly, intubation rotary spraying operation: the bottom end of the grouting rotary spray pipe (6) is respectively provided with a grout outlet (61), a water outlet (62) and a gas outlet (63), wherein the grout outlet (61) and the gas outlet (63) are positioned on the same horizontal plane, the water outlet (62) is positioned above the grout outlet (61) and the gas outlet (63), the injection grouting pipe (6) is inserted into a preset depth, an air compressor (4) is started, a high-pressure water pump (7) is started after the air compressor (4) operates normally, air and water are conveyed into a hole, the pressure value of the air is 1.6-2.2 MPa, a high-pressure slurry pump (3) is started for grouting, and when cement slurry flows out of the grout outlet (61), the injection grouting pipe (6) is lifted, and grouting is injected from bottom to top; when the jet grouting pipe (6) performs grouting, a water outlet (62) on the jet grouting pipe (6) performs washing reaming on the drilled hole, so that the aperture of the drilled hole is enlarged, and a space is reserved between the jet grouting pipe (6) and the hole wall;

step five, washing: washing the injection grouting pipe (6) and the machine tool equipment with clean water;

sixthly, moving the machine tool: and transferring the washed injection grouting pipe (6) and the machine tool equipment to the next hole site, and spraying the next hole site.

2. The triple-pipe three-high-pressure jet grouting pile construction method according to claim 1, characterized in that: in the second step of drilling and forming the hole by the protective wall, the diameter of the hole opening of the formed hole does not exceed the pipe outer diameter of the jet grouting pipe (6) by 10cm, and the caliber of the bottom end of the hole is larger than the outer diameter of the jet grouting pipe (6) by 2 cm.

3. The triple-pipe three-high-pressure jet grouting pile construction method according to claim 1, characterized in that: and in the fourth step, the intubation rotary spraying operation adopts a hole jumping construction mode with 2-3 holes at intervals.

4. The triple-pipe three-high-pressure jet grouting pile construction method according to claim 3, characterized in that: and in the fourth step, when the inserting pipe rotary spraying operation is carried out on deep rotary spraying, the inserting pipe rotary spraying operation firstly sprays the slurry and then rotates and lifts, and the sitting spraying time is provided for the pile end.

5. The triple-pipe three-high-pressure jet grouting pile construction method according to claim 4, characterized in that: and in the fourth step, the measurement work of various parameters such as pressure, flow, slurry bleeding and the like is well carried out during the rotary spraying of the plug pipe rotary spraying operation, and the parameters are recorded item by item according to requirements.

6. The triple-pipe three-high-pressure jet grouting pile construction method according to claim 5, characterized in that: and in the fourth step, the elevation of the adjacent ground and underground pipelines is performed in advance in the plug-in rotary spraying operation before the rotary spraying, the elevation is detected in the rotary spraying process, when the variation value of the elevation varies by more than 10mm, the construction is suspended, and the construction is performed after the pressure parameters are adjusted according to actual conditions.

7. The triple-pipe three-high-pressure jet grouting pile construction method according to claim 6, characterized in that: in the fourth step, the plug pipe rotary spraying operation is carried out under the condition that the slurry outflow amount exceeds 20 percent or the slurry does not flow, if the soil layer has larger gaps, the proper amount of accelerating agent is added in the slurry; when the slurry outflow is too large, the injection pressure is increased, the aperture of the nozzle is properly reduced, the lifting and rotating speed is accelerated, and the slurry injection amount is adjusted.

8. The triple-pipe three-high-pressure jet grouting pile construction method according to claim 7, characterized in that: after the operation of the rotary jet of the insert pipe in the fourth step is finished, if the top of the consolidation body (12) is concave, chiseling off the top of the consolidation body (12) after the construction of the rotary jet pile is finished, filling the concave position with concrete or directly injecting grout into the rotary jet hole again; or drilling for 0.5-1 m in the top 0.5-1 m of the consolidated body (12) after the rotary spraying is finished, and grouting and re-spraying once again by the in-situ lifting rod.

9. The triple-pipe three-high-pressure jet grouting pile construction method according to claim 8, characterized in that: and in the fourth step, in the inserted pipe rotary spraying operation, the cement paste is filtered by a screen before being sprayed, and the filtering mesh of the screen is smaller than half of the diameter of a nozzle on the spray head.

10. The triple-pipe three-high-pressure jet grouting pile construction method according to claim 9, characterized in that: stopping the machine for inspection when the grouting pressure suddenly rises in the intubation jet grouting operation in the fourth step, and firstly releasing the pressure; if the nozzle is blocked, the drill rod is lifted and dredged by a copper needle; and loosening the joint for dredging other blockages, and performing rotary spraying after the blockage disappears.

Technical Field

The invention relates to the field of constructional engineering, in particular to a construction method of a triple-pipe three-high-pressure jet grouting pile.

Background

The high-pressure rotary jet pile belongs to the field of high-pressure jet grouting method. On the basis of static pressure grouting, the high-pressure water jet cutting technology is adopted to develop the high-pressure water jet cutting technology. The double high-pressure rotary spraying method utilizes the energy of the movement of the ultrahigh-pressure spraying fluid to destroy the foundation structure, and forms a large-diameter reinforced body by mixing and stirring disturbed soil particles and hardening materials. The technology has the advantages of wide application, convenient construction, simple process, quick effect of foundation reinforcement, good durability, short construction period and the like, and has the advantages of wide material source, low price, low noise, no pollution, no public nuisance, no production safety and the like.

With the development of underground engineering in the depth direction, ultra-deep underground engineering is more and more, and engineering requirements also present diversified trends. The conventional high-pressure jet grouting pile has a series of defects of low working efficiency, small pile forming diameter, large soil squeezing effect and the like, so that the requirement of ultra-deep underground engineering is difficult to meet.

Disclosure of Invention

The invention aims to provide a construction method of a triple-pipe three-high-pressure jet grouting pile, which has the advantage of increasing the diameter of the pile, thereby meeting the requirement of the jet grouting pile in ultra-deep underground engineering.

The technical purpose of the invention is realized by the following technical scheme:

a construction method of a triple-pipe three-high pressure jet grouting pile is characterized by comprising the following steps: the method comprises the following steps:

firstly, measuring and setting-out positioning: measuring and releasing a construction axis according to a designed construction drawing;

secondly, guiding the drill rig to be in place: arranging a drilling machine on the designed pile position, and aligning a drill bit of the drilling machine to the center of the pile position; meanwhile, the drilling machine is horizontally adjusted, so that the axis of a drill rod of the drilling machine is vertically aligned with the center position of a drill hole;

thirdly, drilling a protecting wall to form holes: drilling by a drilling machine to form a hole, and protecting the wall by using slurry until the hole depth reaches the designed hole depth elevation, wherein the hole diameter is larger than the outer diameter of the jet grouting pipe;

fourthly, intubation rotary spraying operation: the bottom end of the grouting rotary spray pipe is respectively provided with a grout outlet, a water outlet and a gas outlet, wherein the grout outlet and the gas outlet are positioned on the same horizontal plane, the water outlet is positioned above the grout outlet and the gas outlet, the grouting pipe is inserted into a preset depth, an air compressor is started, a high-pressure water pump is started after the air compressor runs normally, air and water are conveyed into the hole, the pressure value of the air is 1.6-2.2 MPa, a high-pressure mud pump is started for grouting, the grouting pipe is lifted after grout flows out of the grout outlet, and grouting is performed by spraying from bottom to top; when the jet grouting pipe performs grouting, a water outlet on the jet grouting pipe performs washing and reaming on the drilled hole, so that the aperture of the drilled hole is enlarged, and a space is reserved between the jet grouting pipe and the hole wall;

step five, washing: washing the injection grouting pipe and the machine tool equipment with clear water;

sixthly, moving the machine tool: and transferring the washed injection grouting pipe and the machine tool equipment to the next hole site, and spraying the next hole site.

By adopting the technical scheme, high-pressure air is increased during the intubation jet grouting operation, so that the high-pressure air pushes cement slurry, the cement slurry is pushed towards the inner wall direction of the drilled hole, the depth of the cement slurry extending into the inner wall of the drilled hole is deepened, the diameter of the finally formed jet grouting pile is increased, and the requirement on the diameter of the jet grouting pile in ultra-deep engineering is met.

The invention is further configured to: in the second step, in the drilling and wall protecting hole forming, the diameter of the orifice of the formed hole does not exceed the outer diameter of the jet grouting pipe by 10cm, and the caliber of the bottom end of the hole is larger than the outer diameter of the jet grouting pipe by 2 cm.

By adopting the technical scheme, a large gap is reserved between the injection grouting pipe and the hole wall, so that the pressure in the hole is released conveniently, the high-pressure water pressure is reduced, the water-cement ratio of slurry is increased, and the lifting speed of the grouting pipe is increased.

The invention is further configured to: and in the fourth step, the intubation rotary spraying operation adopts a hole jumping construction mode with 2-3 holes at intervals.

By adopting the technical scheme, the pressure generated in the construction process of the jet grouting pile can be released from the surrounding pile holes, so that the influence on nearby structures is reduced.

The invention is further configured to: and fourthly, the inserting pipe rotary spraying operation is carried out, when deep rotary spraying is carried out, the rotating and lifting are carried out after the guniting, and the sitting spraying time is provided at the pile end.

By adopting the technical scheme, the sitting spraying time is set to ensure the quality of the pile end.

The invention is further configured to: and fourthly, the intermediate pipe rotary spraying operation is implemented by measuring various parameters such as pressure, flow and slurry leakage during rotary spraying, and recording item by item according to requirements.

Through adopting above-mentioned technical scheme, make things convenient for constructor to monitor the intubate and spout the operation soon to ensure that the construction can normally go on, meet unusual can the very first time discovery and in time take measures to solve.

The invention is further configured to: and fourthly, the elevation of the nearby ground and underground pipelines is performed in advance in the pipe inserting rotary spraying operation before the rotary spraying, the elevation is detected in the rotary spraying process, when the variation value of the elevation is changed to be larger than 10mm up and down, the construction is suspended, and the construction is performed after the pressure parameters are adjusted according to actual conditions.

By adopting the technical scheme, the elevation is set, so that the influence on surrounding building structures in the construction process can be reflected, and the large damage to surrounding buildings in the construction process is avoided.

The invention is further configured to: fourthly, in the inserting pipe rotary spraying operation, under the condition that the slurry outflow amount exceeds 20 percent or the slurry does not flow, if the soil layer has larger gaps, the proper amount of accelerating agent is added into the slurry; when the slurry outflow is too large, the injection pressure is increased, the aperture of the nozzle is properly reduced, the lifting and rotating speed is accelerated, and the slurry injection amount is adjusted.

By adopting the technical scheme, the setting accelerator is added, so that the setting time of the cement paste is shortened.

The invention is further configured to: fourthly, after the pipe inserting rotary spraying operation is completed, if the top of the consolidation body is concave, chiseling off the top of the consolidation body after the rotary spraying pile construction is completed, and filling the concave position with concrete or directly injecting grout into the rotary spraying holes again; or drilling for 0.5-1 m in the top 0.5-1 m of the consolidated body after the rotary spraying is finished, and grouting and re-spraying once again in the in-situ lifting rod.

By adopting the technical scheme, the concave part on the top of the consolidation body is repaired, so that the strength of the consolidation body structure is ensured.

The invention is further configured to: and in the fourth step of the plug pipe rotary spraying operation, the cement paste is filtered by a screen before being sprayed, and the filtering mesh of the screen is smaller than half of the diameter of a nozzle on the spray head.

Through adopting above-mentioned technical scheme, through filtering grout in advance to avoid having great granule in the grout, thereby plug up the nozzle on the shower nozzle.

The invention is further configured to: in the fourth step, when the intubation jet grouting operation meets the sudden rise of grouting pressure, the machine is stopped for inspection, and pressure is relieved firstly; if the nozzle is blocked, the drill rod is lifted and dredged by a copper needle; and loosening the joint for dredging other blockages, and performing rotary spraying after the blockage disappears.

Through adopting above-mentioned technical scheme, when the nozzle blockked up, dredge to the nozzle through the copper to ensure the nozzle with the grout blowout, when taking place to block up between the injection slip casting pipe, loosen the joint and dredge, thereby ensure the normal clear of construction.

In conclusion, the invention has the following beneficial effects:

1. the cement slurry is pushed by high-pressure air, so that the direction of the inner wall of the cement slurry phase drilling hole is pushed, the depth of the cement slurry extending into the inner wall of the drilling hole is deepened, the diameter of the finally formed rotary jet pile is increased, and the requirement for the diameter of the rotary jet pile in ultra-deep engineering is met

2. By adopting the slurry retaining wall, the static pressure of the slurry on the wall of the tank and the mud skin formed by the slurry on the wall of the tank can effectively prevent the tank and the wall of the tank from collapsing;

3. the diameter of the hole is increased through the washing reaming, so that a larger distance is reserved between the hole wall and the injection grouting pipe, the pressure in the hole is conveniently released, and the soil squeezing effect is reduced;

4. the machine tool equipment and the injection grouting pipe which are moved to the next hole site are prevented from being blocked by cement slurry by washing the injection grouting pipe and the machine tool equipment;

5. through the hole jumping construction, the pressure generated in the construction process of the jet grouting pile can be released from the surrounding pile holes, so that the influence on nearby structures is reduced;

6. by setting the elevation, the influence on surrounding building structures in the construction process can be reflected, and the large damage to surrounding buildings in the construction process is avoided;

7. through filtering grout in advance to avoid there being great granule in the grout, thereby plug up the nozzle on the shower nozzle.

Drawings

FIG. 1 is a schematic diagram of a triple-tube triple-high pressure jet grouting pile according to an embodiment of the invention;

fig. 2 is a flow chart of a triple-pipe three-high-pressure jet grouting pile construction process according to an embodiment of the invention.

In the figure, 1, a drilling machine; 2. triple-pipe three-high-pressure rotary spraying trolley; 3. a slurry pump; 4. an air compressor; 5. a mortar mixer; 6. a jet grouting pipe; 61. a pulp outlet; 62. a water outlet; 63. an air outlet; 7. a high pressure water pump; 8. a water tank; 9. a cement bin; 10. a pulp barrel; 11. a gas meter; 12. and (5) solidifying the body.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings. In which like parts are designated by like reference numerals. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "bottom" and "top," "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.