Bridge pile foundation reaming construction method

Abstract

The application discloses a bridge pile foundation reaming construction method, and relates to the technical field of building engineering, which comprises the steps of reserving a hole position, positioning and simulating, grouting and reaming, hole cleaning and fixing a pile body; the position and depth of the prefabricated hole can be accurately determined and a reaming scheme can be generated by using laser positioning and simulating the whole reaming process. In the reaming process, the rotary digging reamer is used for reaming, and the hole wall and the hole bottom are washed by using special mud and a high-pressure water gun, so that the reaming can be quickly and accurately completed, and the construction efficiency is greatly improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of building engineering, and particularly relates to a bridge pile foundation reaming construction method. BACKGROUND

[0002] The pile foundation reaming technology is an important technology in modern building engineering. In some engineering projects requiring foundation reinforcement, due to deep soil layers, problems such as long consolidation time and low bearing capacity are caused, and therefore the pile foundation reaming technology needs to be used to improve the bearing capacity of the foundation.

[0003] In the traditional bridge pile foundation construction method, a rotary drilling rig or a drilling machine is usually used to drill a hole, then a pile body is placed in the hole, and finally a steel sleeve and the pile body are grouted to complete pouring. During the drilling process, due to the complex stratum conditions, some problems that are difficult to handle often occur, such as the presence of brick slag and other debris that are difficult to clean. The brick slag is difficult to remove, which will directly affect the installation of the steel sleeve and the grouting of cement.

[0004] Therefore, the application provides a bridge pile foundation reaming construction method to solve the problems in the background technology. SUMMARY

[0005] The application aims to provide a bridge pile foundation reaming construction method to solve at least one aspect of the problems and defects in the background technology.

[0006] According to one aspect of the application, a bridge pile foundation reaming construction method is provided, comprising the following steps:

[0007] S1, Reserving a hole position: when the pile foundation is prefabricated, a prefabricated hole for reaming is reserved, and the diameter of the prefabricated hole is half of the diameter of the pile foundation;

[0008] S2, Positioning and simulation: the position and depth of the prefabricated hole are determined by laser positioning, the entire reaming process is simulated by using the position and depth data of the prefabricated hole, and a reaming scheme is generated;

[0009] S3, Grouting and reaming: according to the reaming scheme, a rotary drilling reamer is used to ream the hole, the rotary drilling reamer rotates to gradually expand the hole diameter along the hole wall of the prefabricated hole until the required hole diameter size is reached; during the reaming process, a mud pump is used to inject prepared mud into the hole, the rotary drilling reamer rotates to form a high-speed vortex of the injected mud, the hole wall is washed, and the debris generated in the reaming process is suspended; the mud is special mud;

[0010] S4, Hole cleaning: under the washing of the mud, a high-pressure water gun is used to clean the hole wall and the hole bottom, after the reaming is completed, the mud pump is used to pump out the mud, the cleaned soil and the suspended debris together;

[0011] S5, fixing the pile body: after the hole is expanded, the steel sleeve is pressed down along the pile body until it is completely inserted into the hole, and cement is poured between the steel sleeve and the pile body to complete pouring.

[0012] According to another exemplary embodiment of the present application, the preparation method of the special mud is as follows:

[0013] A1, preparing a polymer solution: according to mass fraction, 0.02-0.05 parts of polymer is added to 3 parts of water, stirred uniformly until completely dissolved, forming a polymer melt;

[0014] A2, preparing a clay mixture: according to mass fraction, 0.20-0.40 parts of clay is added to 3 parts of water, stirred uniformly, and left to stand for 5-10 hours until the clay particles are completely water-swollen to form a clay mixture;

[0015] A3, preparing a calcium carbonate suspension: according to mass fraction, 0.02-0.05 parts of calcium carbonate is added to 3 parts of water, stirred uniformly to form a calcium carbonate suspension;

[0016] A4, the polymer solution, clay mixture and calcium carbonate suspension are added to a mixing barrel and stirred uniformly;

[0017] A5, the mixed mud is placed in a blender, 1 part of water is added, and the stirring and mixing are continued uniformly;

[0018] A6, clay and calcium carbonate particles are added according to the size ratio, stirred and mixed uniformly to obtain the final special mud.

[0019] According to another exemplary embodiment of the present application, the average diameter of the clay particles is 10um, accounting for 80% of the total mass of the special mud, and the average diameter of the calcium carbonate particles is 50um, accounting for 20% of the total mass of the special mud.

[0020] According to another exemplary embodiment of the present application, the type of clay is bentonite or illite or a mixture of both.

[0021] According to another exemplary embodiment of the present application, the polymer is made of a mixture of polyvinyl alcohol and polyacrylamide.

[0022] According to another exemplary embodiment of the present application, the mass ratio of polyvinyl alcohol and polyacrylamide is 1:3.

[0023] According to another exemplary embodiment of the present application, the steel sleeve is a prefabricated reinforced concrete sleeve, and the outer diameter of the steel sleeve is between 110-140mm.

[0024] According to another exemplary embodiment of the present application, the cleaning pressure of the high-pressure water gun is 150-200 Mpa.

[0025] Compared with the prior art, the present application has the following advantages:

[0026] 1. The present application can accurately determine the position and depth of the preformed hole and generate a reaming plan by using laser positioning and simulating the entire reaming process. During the reaming process, a rotary reamer is used to ream the hole, and a high-pressure water gun is used to flush the hole wall and hole bottom, so that the reaming can be quickly and accurately completed, and the construction efficiency is greatly improved.

[0027] 2. The present application uses a mud pump to inject the prepared special mud into the hole, and the rotary reamer rotates to form a high-speed vortex of the injected mud, flushes the hole wall, and suspends the debris generated during the reaming process. Through the hole cleaning process, the mud, the cleaned soil, and the suspended debris are extracted together, ensuring that the hole wall is clean and smooth after reaming, thereby improving the construction quality. DETAILED DESCRIPTION

[0028] The present application will be further described below through specific embodiments:

[0029] The viscosity of the special mud is measured by a viscometer, and the specific gravity of the special mud is measured by a specific gravity bottle method.

[0030] A bridge pile foundation reaming construction method, comprising the following steps:

[0031] S1, reserving a hole position: when the pile foundation is preformed, a preformed hole for reaming is reserved, and the diameter of the preformed hole is half of the diameter of the pile foundation;

[0032] S2, positioning and simulation: the position and depth of the preformed hole are determined by laser positioning, and the entire reaming process is simulated by using the position and depth data of the preformed hole to generate a reaming plan;

[0033] S3, grouting and reaming: according to the reaming plan, a rotary reamer is used to ream the hole, the rotary reamer rotates to gradually expand the hole diameter along the hole wall of the preformed hole until the required hole diameter is reached; during the reaming process, a mud pump is used to inject the prepared mud into the hole, the rotary reamer rotates to form a high-speed vortex of the injected mud, flushes the hole wall, and suspends the debris generated during the reaming process; the mud is a special mud;

[0034] S4, hole cleaning: under the flushing of the mud, a high-pressure water gun is used to clean the hole wall and hole bottom, and after the reaming is completed, the mud pump extracts the mud, the cleaned soil, and the suspended debris together;

[0035] S5, fixing the pile body: after the hole is expanded, the steel sleeve is pressed down along the pile body until it is completely inserted into the hole, and cement is poured between the steel sleeve and the pile body to complete pouring.

[0036] Example 1

[0037] The preparation method of the special mud is as follows:

[0038] A1, preparing a polymer solution: 0.02 kg of polymer is added to 3 kg of water and stirred until completely dissolved to form a polymer melt;

[0039] A2, preparing a clay mixture: 0.20 kg of clay is added to 3 kg of water and stirred until completely dissolved to form a clay mixture;

[0040] A3, preparing a calcium carbonate suspension: 0.02 kg of calcium carbonate is added to 3 kg of water and stirred until completely dissolved to form a calcium carbonate suspension;

[0041] A4, the polymer solution, clay mixture and calcium carbonate suspension are added to a mixing barrel and stirred until completely dissolved;

[0042] A5, the mixed mud is placed in a blender and 1 kg of water is added and stirred until completely dissolved;

[0043] A6, clay and calcium carbonate particles are added according to the size ratio and stirred until completely dissolved to obtain the final special mud.

[0044] The average diameter of the clay particles is 10 um, accounting for 80% of the total mass of the special mud, and the average diameter of the calcium carbonate particles is 50 um, accounting for 20% of the total mass of the special mud.

[0045] In this embodiment, the type of clay is bentonite.

[0046] Preferably, the polymer is made of polyvinyl alcohol and polyacrylamide mixed in a mass ratio of 1:3.

[0047] Preferably, the steel sleeve is a reinforced concrete sleeve with a diameter of 110.

[0048] Preferably, the cleaning pressure of the high-pressure water gun is 150 Mpa.

[0049] The relative density of this experiment is 1.08 and the viscosity is 21.6 pa·s.

[0050] Example 2

[0051] The preparation method of the special mud is as follows:

[0052] A1, preparing polymer solution: 0.03 kg of polymer is added into 3 kg of clean water, and stirred until completely dissolved to form a polymer solution;

[0053] A2, preparing clay mixture: 0.30 kg of clay is added into 3 kg of clean water, and stirred until completely dissolved to form a clay mixture;

[0054] A3, preparing calcium carbonate suspension: 0.03 kg of calcium carbonate is added into 3 kg of clean water, and stirred until completely dissolved to form a calcium carbonate suspension;

[0055] A4, the polymer solution, clay mixture and calcium carbonate suspension are added into a mixing barrel, and stirred until completely dissolved;

[0056] A5, the mixed mud is put into a blender, and 1 kg of clean water is added, and stirred until completely dissolved;

[0057] A6, clay and calcium carbonate particles are added according to the size ratio, and stirred until completely dissolved to obtain the final special mud.

[0058] Among them, the average diameter of the clay particles is 10 um, and the mass percentage of the special mud is 80%; the average diameter of the calcium carbonate particles is 50 um, and the mass percentage of the special mud is 20%.

[0059] In this embodiment, the type of clay is illite.

[0060] Preferably, the polymer is made of polyvinyl alcohol and polyacrylamide mixed, and the mass ratio of polyvinyl alcohol and polyacrylamide is 1:3.

[0061] Preferably, the steel pipe sleeve is a reinforced concrete sleeve with a diameter of 120.

[0062] Preferably, the cleaning pressure of the high-pressure water gun is 180 Mpa.

[0063] The relative density of this experiment is 1.12, and the viscosity is 22.8 pa·s.

[0064] Example 3

[0065] The preparation method of the above special mud is as follows:

[0066] A1, preparing polymer solution: 0.05 kg of polymer is added into 3 kg of clean water, and stirred until completely dissolved to form a polymer solution;

[0067] A2, preparing clay mixture: 0.40 kg of clay is added into 3 kg of clean water, and stirred until completely dissolved to form a clay mixture;

[0068] A3, preparing calcium carbonate suspension: 0.05 kg of calcium carbonate is added into 3 kg of clean water, and stirred to form calcium carbonate suspension;

[0069] A4, the polymer solution, clay mixture and calcium carbonate suspension are added into a mixing barrel, and stirred to mix uniformly;

[0070] A5, the mixed mud is put into a blender, 1 kg of clean water is added, and stirred to mix uniformly;

[0071] A6, clay and calcium carbonate particles are added according to the particle size ratio, and stirred to mix uniformly to obtain the final special mud.

[0072] In the embodiment, the average diameter of the clay particles is 10 um, and the clay particles account for 80% of the total mass of the special mud; the average diameter of the calcium carbonate particles is 50 um, and the calcium carbonate particles account for 20% of the total mass of the special mud.

[0073] In the embodiment, the type of the clay is illite.

[0074] Preferably, the polymer is made of polyvinyl alcohol and polyacrylamide mixed, and the mass ratio of the polyvinyl alcohol and the polyacrylamide is 1:3.

[0075] Preferably, the steel pipe sleeve is a reinforced concrete sleeve with a diameter of 140.

[0076] Preferably, the cleaning pressure of the high-pressure water gun is 200 Mpa.

[0077] The relative density of the experiment is 1.24, and the viscosity is 24.3 pa·s.

[0078] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above description is only for specific embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A method for bridge pile foundation reaming construction, characterized in that, The method comprises the following steps: S1, reserving hole position: reserving a prefabricated hole for hole expansion when the pile foundation is prefabricated, the diameter of the prefabricated hole being half of the diameter of the pile foundation; S2, positioning and simulation: determining the position and depth of the prefabricated hole through laser positioning, simulating the whole hole expansion process by using the position and depth data of the prefabricated hole, and generating a hole expansion scheme; S3, grouting and hole expansion: expanding the hole according to the hole expansion scheme by using a rotary drilling hole expander, the rotary drilling hole expander rotating and excavating along the hole wall of the prefabricated hole to gradually expand the hole diameter until the required hole diameter is reached; during the hole expansion process, a mud pump is used to inject prepared mud into the hole, the rotary drilling hole expander rotates to form a high-speed vortex of the injected mud, the hole wall is washed, and the debris generated in the hole expansion process is suspended; the mud is special mud; S4, hole cleaning: under the washing of the mud, the hole wall and the hole bottom are cleaned by using a high-pressure water gun, after the hole expansion is completed, the mud pump is used to pump the mud, the cleaned soil and the suspended debris away; S5, fixing the pile body: after the hole expansion is completed, a steel pipe sleeve is pressed down along the pile body until it is completely inserted into the hole, cement is poured between the steel pipe sleeve and the pile body, and pouring is completed; The preparation method of the special mud is as follows: A1, preparing a polymer solution: according to the mass fraction, 0.02-0.05 parts of polymer is added to 3 parts of water, stirred uniformly until completely dissolved, and a polymer melt is formed; A2, preparing a clay mixture: according to the mass fraction, 0.20-0.40 parts of clay is added to 3 parts of water, stirred uniformly, and left to stand for 5-10 hours until the clay particles are completely water-swollen to form a clay mixture; A3, preparing a calcium carbonate suspension: according to the mass fraction, 0.02-0.05 parts of calcium carbonate is added to 3 parts of water, stirred uniformly, and a calcium carbonate suspension is formed; A4, the polymer solution, the clay mixture and the calcium carbonate suspension are added to a mixing barrel and stirred uniformly; A5, the mixed mud is put into a blender, 1 part of water is added, and the mixing is continued until it is uniform; A6, clay and calcium carbonate particles are added according to the particle size ratio, stirred and mixed uniformly, and the final special mud is obtained; The polymer is made of a mixture of polyvinyl alcohol and polyacrylamide.

2. The method according to claim 1, wherein, The average diameter of the clay particles is 10 um, and the clay particles account for 80% of the total mass of the special mud; the average diameter of the calcium carbonate particles is 50 um, and the calcium carbonate particles account for 20% of the total mass of the special mud.

3. The method according to claim 1, wherein, The type of clay is bentonite or illite or a mixture of the two.

4. The method according to claim 3, wherein, The mass ratio of polyvinyl alcohol to polyacrylamide is 1:

3.

5. The method according to claim 1, wherein, The steel pipe sleeve is a prefabricated reinforced concrete sleeve, and the outer diameter of the steel pipe sleeve is between 110-140 mm.

6. The method according to any one of claims 1-5, characterized in that, The cleaning pressure of the high-pressure water gun is 150-200 Mpa.