Small-diameter pile slurry wall forming process

Abstract

The present application discloses a small-diameter pile mud wall protection hole-forming process, fills desert soil, and the geological loose sand pebble is loose, the hole wall will collapse when the drill rod is pulled out, the hole collapses when the drill rod is pulled out, the desert soil is filled in the collapsed hole with a shovel, the desert soil is filled to the level of the hole mouth, the desert soil is immersed in water, the hole is treated by immersion after being filled with desert soil, water in the water cart is introduced into the hole by using a fine tube, the soil in the hole and the surrounding soil is fully infiltrated, secondary impact drilling is carried out, the drill rod on the forearm clamp seat is replaced after the water is completely absorbed, secondary reaming is carried out, and the pile hole with mud wall protection is formed; the mud wall protection structure can effectively avoid the collapse of the pile foundation structure of the sand pebble geology, reinforce the inner wall of the pile hole, facilitate the subsequent installation of the cage and the concrete pouring operation, according to the permeable characteristics of the sand pebble geology, the filling of desert soil and the water injection are adopted, the soil viscosity in the hole is improved, the hole wall mud is formed, and the construction difficulty of the pile foundation is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of building construction technology, more particularly to a small-diameter pile mud wall forming process. BACKGROUND

[0002] At present, the main forms of photovoltaic support foundation are micro-hole cast-in-place pile foundation, spiral steel pile foundation, reinforced concrete strip foundation and precast pile foundation. The small-diameter pile mud wall forming process is a process for performing foundation construction operation on the photovoltaic support, which can sequentially form a foundation structure for fixing the photovoltaic support.

[0003] The northwest region has good light resource conditions, but most of the northwest region is sandy pebble geology. The conventional spiral drilling operation is prone to hole collapse, and it is difficult to form a pile foundation hole, which makes the drilled foundation hole prone to collapse, increasing the operation difficulty during the construction of the sandy pebble geological structure foundation. The traditional construction process cannot form a wall structure during pile foundation drilling operation, and the sandy pebble geological structure is difficult to be formed at one time. After the drill rod structure used for punching is pulled out, the inner wall of the foundation hole is prone to collapse, which makes it impossible to install the cage in the foundation hole, thereby increasing the difficulty of pouring the small-diameter pile. SUMMARY

[0004] The purpose of the present application is to provide a small-diameter pile mud wall forming process, which can solve the existing problems.

[0005] The problem solved by the present application is:

[0006] 1. When performing construction operation on sandy pebble geology, the conventional spiral drilling operation is prone to hole collapse, and it is difficult to form a pile foundation hole, which makes the drilled foundation hole prone to collapse, increasing the operation difficulty during the construction of the sandy pebble geological structure foundation.

[0007] 2. The traditional construction process cannot form a wall structure during pile foundation drilling operation, and the sandy pebble geological structure is difficult to be formed at one time. After the drill rod structure used for punching is pulled out, the inner wall of the foundation hole is prone to collapse, which makes it impossible to install the cage in the foundation hole, thereby increasing the difficulty of pouring the small-diameter pile.

[0008] The purpose of the present application can be achieved by the following technical solutions:

[0009] The small-diameter pile mud wall forming process comprises the following steps:

[0010] Step 1, construction preparation, leveling the site, and checking the measuring instruments;

[0011] Step 2, measurement and positioning, rechecking the site control points, and confirming that there is no error before using GPS to measure and position the foundation pile;

[0012] Step three, once impact drilling, the drill rod is installed in the excavator's forearm card seat position, using the principle of hydraulic impact to drill the foundation pile position once;

[0013] Step four, fill the desert soil, sand and gravel geology is loose, the hole wall will collapse when the drill rod is pulled out, the hole collapses when the drill rod is pulled out, fill the desert soil in the collapsed hole with a shovel, so that the desert soil is filled to the level of the hole;

[0014] Step five, water immersion desert soil, after filling the hole with desert soil, water immersion treatment is carried out, using a fine tube to guide the water in the water cart into the hole, ensuring that the soil around the hole is fully saturated;

[0015] Step six, the foundation hole is left to stand, by filling the desert soil and water immersion treatment, the mud is formed in the hole, using the characteristics of sand and gravel geology, the water is quickly lost, after two hours of standing, the hole is filled with soil with viscosity and plasticity;

[0016] Step seven, second impact drilling, after the water is completely absorbed, replace the drill rod on the forearm card seat, and perform the second reaming, forming a mud wall pile hole;

[0017] Step eight, foundation pouring, after placing the reinforcement cage in the hole, pouring concrete, and after the concrete solidifies, the foundation pile is formed.

[0018] During the first impact drilling operation, the operating machine aligns the head of the drill rod with the center of the pile foundation point, and uses the hydraulic principle to impact the pile foundation point to drill once. During the construction process, two workers respectively perform the checking operation in the vertical direction, so that the drill rod always maintains the vertical direction, and the center position of the pile foundation is accurate.

[0019] During the first impact drilling operation, the hydraulic oil energy and nitrogen compression energy of the excavator hydraulic device are used to drive the oil cylinder rod to hammer the drill rod, so that the drill rod completes the drilling work on the foundation pile position. When the drill rod reaches the predetermined depth, the drill rod is pulled out vertically, thereby completing the first drilling operation of the foundation hole.

[0020] During the second impact drilling operation, the diameter of the replaced drill rod is greater than the diameter of the hole drilled the first time. When the replaced drill rod is inserted into the foundation hole, the hole wall is subjected to an extrusion force from the inside to the outside. Because the hole wall is attached with fully moistened desert soil, the insertion of the drill rod causes the desert soil to be extruded outward, thereby increasing the diameter of the foundation hole. Therefore, during the second reaming process, the hole wall will not collapse, and the reaming operation can be performed again to make the thickness of the hole wall mud uniform, thereby ensuring the qualified quality of the hole.

[0021] The base pouring operation pours concrete to the hole position, and then a handheld vibrator is used to vibrate and compact the concrete in the hole, and after the concrete pouring construction is completed, the exposed part of the pile body is wrapped with a film and water is sprayed for maintenance.

[0022] When the drill rod is replaced, the steel drill lock pin and the steel drill flat pin on the forearm holder are removed, the drill rod is pulled out of the forearm holder, after the corresponding drill rod is replaced, the butt joint of the drill rod is inserted into the butt joint slot, and the steel drill lock pin and the steel drill flat pin are used for fixation.

[0023] In the secondary impact drilling operation, by replacing the drill rod larger than the hole diameter, when the drill rod is inserted into the hole, the hole wall is subjected to extrusion force, the surface strength of the hole wall is increased, and after the soil on the hole wall is naturally dried, a dry mud skin protection wall is formed.

[0024] The beneficial effects of the present application are:

[0025] 1. When the user performs pile foundation construction on sandy pebble geology, by filling and irrigating desert soil, a mud slurry protection wall structure is formed on the inner wall of the hole in the secondary impact drilling operation, so as to improve the internal structure strength of the hole and avoid the collapse of the hole.

[0026] According to the permeable characteristics of sandy pebble geology, the filling and irrigating of desert soil is adopted to improve the soil viscosity in the hole and form a hole protection mud slurry, so as to reduce the construction difficulty of the pile foundation.

[0027] 2、In the user in the sand gravel pile foundation construction operation, by replacing the hole in the secondary impact drilling operation, the drill rod structure is greater than the hole, so that the drill rod is inserted into the hole, and the hole wall is extruded, the hole wall surface strength is increased, the soil on the hole wall is naturally dried, and the dry mud skin protection wall is formed, when operating, the steel drill lock pin and the steel drill flat pin on the forearm card seat are removed, the drill rod is pulled out from the forearm card seat, the corresponding drill rod is replaced, the butt joint of the drill rod is inserted into the butt joint slot, and the steel drill lock pin and the steel drill flat pin are used for fixing, the double fixing structure of the steel drill lock pin and the steel drill flat pin is used, the installation operation of the drill rod is more firm, and the flexibility during the replacement operation of the drill rod is improved. By secondary impact drilling, the hole wall is extruded, the hole wall becomes more solid, and when the soil of the protection wall is naturally dried, a solid dry mud skin protection wall is formed, so that the subsequent pouring pile reinforcement cage installation and concrete pouring can be satisfied, so that the protection wall structure can be formed during the small-diameter pile foundation construction operation, and the construction effect is improved. BRIEF DESCRIPTION OF DRAWINGS

[0028] The application will be further described below in combination with the drawings.

[0029] Fig. 1 is the flowchart of the application;

[0030] Fig. 2 is the installation structure diagram of the drill rod in the application.

[0031] In the figure: 1, drill rod; 2, forearm card seat; 3, steel drill lock pin; 4, steel drill flat pin; 5, butt joint slot; 6, butt joint. DETAILED DESCRIPTION

[0032] In order to further illustrate the technical means and effects adopted by the application to achieve the predetermined application purpose, the specific embodiments, structures, features and effects according to the application will be described in detail below in combination with the drawings and preferred embodiments.

[0033] As shown in Figs. 1-2 , the small-diameter pile mud protection wall hole forming process comprises the following steps:

[0034] Step one, construction preparation, leveling operation is performed on the site, measurement instruments are checked, corresponding construction machinery is selected, drawings and related technical requirements are understood, a construction scheme is prepared, and a safety technical briefing book is prepared;

[0035] Step two, measurement and positioning, the control points of the site are rechecked, and the foundation pile position is measured and positioned using GPS after it is confirmed to be correct. The model of the GPS equipment is T23T.

[0036] Step three, primary impact drilling, the drill rod 1 is installed at the forearm card seat 2 position of the excavator, and the primary drilling of the foundation pile position is performed by using the hydraulic impact principle.

[0037] Step four, fill the desert soil, sand and gravel geology loose, the hole wall will collapse when the drill rod 1 is pulled out, the hole collapses when the drill rod 1 is pulled out, and the desert soil is filled in the collapsed hole with a shovel to make the desert soil fill to the same level as the hole;

[0038] Step five, water immersion desert soil, the hole is filled with desert soil and immersed in water, and the water in the water cart is introduced into the hole using a fine tube to ensure that the soil in the hole and around the hole is fully immersed;

[0039] Step six, the foundation hole is left to stand, the hole is filled with mud by filling the desert soil and immersion treatment, and the water is quickly lost by using the characteristics of the sand and gravel geology. After the hole is left to stand for two hours, the hole is filled with soil with viscosity and plasticity.

[0040] Step seven, secondary impact drilling, after the water is completely absorbed, the drill rod 1 on the forearm holder 2 is replaced, secondary reaming is performed, and a pile hole with mud wall protection is formed.

[0041] Step eight, foundation pouring, after the steel reinforcement cage is placed in the hole, the concrete is poured, and the foundation pile is formed after the concrete is solidified.

[0042] During the first impact drilling operation, the head of the drill rod 1 is aligned with the center of the pile foundation point by the operating machine, the pile foundation point is impacted by using hydraulic principle, the drill rod 1 is always kept in vertical direction by two workers in vertical direction, the center position of the pile foundation is accurate, and the first impact drilling operation is completed.

[0043] During the second impact drilling operation, the diameter of the replaced drill rod 1 is greater than the diameter of the hole drilled in the first time. When the replaced drill rod 1 is inserted into the foundation hole, the hole wall is subjected to extrusion force from inside to outside. Since the hole wall is attached with fully wet desert soil, the drill rod 1 is inserted to extrude the desert soil outward, the hole is reamed, the diameter of the foundation hole is increased, and therefore the hole wall will not collapse during the second reaming. The hole wall mud thickness is uniform during the reaming operation, and the hole quality is ensured to be qualified.

[0044] The base pouring operation pours concrete to the hole position, and then a handheld vibrator is used to vibrate and compact the concrete in the hole. After the concrete pouring construction is completed, the exposed part of the pile body is wrapped with a film and water is sprayed for maintenance. When the drill rod 1 is replaced, the steel drill lock pin 3 and the steel drill flat pin 4 on the forearm holder 2 are removed, the drill rod 1 is pulled out of the forearm holder 2, and after the corresponding drill rod 1 is replaced, the butt joint 6 of the drill rod 1 is inserted into the butt joint slot 5, and the steel drill lock pin 3 and the steel drill flat pin 4 are used to fix it.

[0045] In the secondary impact drilling operation, by replacing the drill rod 1 larger than the hole diameter, when the drill rod 1 is inserted into the hole, the hole wall is subjected to extrusion force, increasing the surface strength of the hole wall. After the soil on the hole wall naturally dries, a dry mud skin wall is formed;

[0046] When the user performs pile foundation construction work on sandy pebble geology, by filling and irrigating desert soil, a mud wall structure is formed on the inner wall of the hole during the secondary impact drilling operation, so as to improve the internal structural strength of the hole and avoid the collapse of the hole. During operation, the drill rod 1 is installed in the forearm holder 2 position of the excavator, and the hydraulic impact principle is used to drill the foundation pile position once. Because the sandy pebble geology is loose, the hole wall will collapse when the drill rod 1 is pulled out. After the drill rod 1 is pulled out, the hole collapses, and the desert soil is filled in the collapsed hole with a shovel, so that the desert soil is filled to the same level as the hole, and the hole is filled with desert soil. After the hole is filled with desert soil, water is used to treat the hole, and water in the water cart is introduced into the hole using a thin tube to ensure that the soil in the hole and around the hole is fully irrigated. After the water is completely absorbed, the drill rod 1 on the forearm holder 2 is replaced, and the hole is expanded again. The diameter of the replaced drill rod 1 is larger than the diameter of the hole drilled the first time. When the replaced drill rod 1 is reinserted into the foundation hole, the hole wall is subjected to extrusion force from the inside to the outside. Because the hole wall is attached with fully moistened desert soil, the drill rod 1 insertion causes the desert soil to extrude outward, expanding the hole. The diameter of the foundation hole is increased, so the hole wall will not collapse during the secondary expansion process. The hole wall mud thickness can be uniformed again during the expansion operation to ensure that the hole quality is qualified, and a pile hole with a mud wall is formed. The mud wall structure can effectively prevent the pile foundation structure from collapsing in sandy pebble geology, and can reinforce the inner wall of the pile hole, facilitating subsequent installation of the cage and concrete pouring operation;

[0047] According to the easy permeability characteristics of sandy pebble geology, the filling and irrigating desert soil method is used to improve the soil adhesion in the hole and form a hole wall mud to reduce the construction difficulty of the pile foundation.

[0048] In the user in the sand pebble geology pile foundation construction work, by replacing the hole in the secondary impact drilling operation, the drill rod 1 structure is greater than the hole, so that the drill rod 1 is inserted into the hole, the hole wall is subjected to extrusion force, the hole wall surface strength is increased, the soil on the hole wall is naturally dried to form a dry mud skin wall, when operating, the steel drill lock pin 3 and the steel drill flat pin 4 on the forearm clamp seat 2 are removed, the drill rod 1 is pulled out from the forearm clamp seat 2, after replacing the corresponding drill rod 1, the butt joint 6 of the drill rod 1 is inserted into the butt joint slot 5, and the steel drill lock pin 3 and the steel drill flat pin 4 are used to fix it, the double fixing structure of the steel drill lock pin 3 and the steel drill flat pin 4 makes the installation operation of the drill rod 1 more firm, and the flexibility of the drill rod 1 when the operation is changed is improved, through secondary impact drilling, the hole wall is extruded, the hole wall will become more solid, when the soil of the wall is naturally dried to form a solid dry mud skin wall, the subsequent pouring pile reinforcement cage installation and concrete pouring can be satisfied, so that the small diameter pile foundation construction work can form a wall structure, and the construction effect is improved.

[0049] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Although the preferred embodiment of the present application has been disclosed as above, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes, without departing from the scope of the technical scheme of the present application. Any modification, equivalent change and modification of the above embodiments made according to the technical essence of the present application, without departing from the technical scheme content of the present application, still belongs to the scope of the technical scheme of the present application.

Claims

1. A process for forming a hole with a small-diameter pile slurry wall, characterized by, The method comprises the following steps: Step 1, construction preparation, leveling the site, checking the measuring instruments; Step 2, measurement and positioning, rechecking the site control points, and using GPS to measure and position the foundation pile position after confirming that there is no error; Step 3, one-time impact drilling, installing the drill rod (1) in the front arm card seat (2) position of the excavator, and using the hydraulic impact principle to drill the foundation pile position once; Step 4, filling and filling desert soil, pulling out the drill rod (1) when the hole collapses, and filling the desert soil in the collapsed hole with a shovel, so that the desert soil is filled to the same level as the hole; Step 5, water immersion and desert soil, after filling the hole with desert soil, water immersion treatment is carried out, a thin tube is used to guide the water in the water cart into the hole, and the soil in the hole and around is fully soaked; Step 6, foundation hole standing, through filling and water immersion treatment, mud is formed in the hole, and the water is quickly lost due to the characteristics of the sandstone geology, and after the collapsed hole is left standing for two hours, the hole is filled with soil with viscosity and plasticity; Step 7, two-time impact drilling, after the water is completely absorbed, the drill rod (1) on the front arm card seat (2) is replaced, and the diameter of the replaced drill rod (1) is greater than that of the first-time drilled hole, when the replaced drill rod (1) is inserted into the foundation hole, the hole wall is subjected to an extrusion force from the inside to the outside, and due to the sufficient wetting of the desert soil attached to the hole wall, the drill rod (1) is inserted to extrude the desert soil outward, expanding the hole, and in the two-time impact drilling operation, by replacing the drill rod (1) with a diameter greater than that of the hole, when the drill rod (1) is inserted into the hole, the hole wall is subjected to an extrusion force, the surface strength of the hole wall is increased, and after the soil on the hole wall naturally dries, a dry mud skin is formed to protect the wall, and two-time expansion is carried out to form a mud skin protected pile hole; Step 8, foundation pouring, pouring concrete into the hole after placing the reinforcement cage, and forming the foundation pile after the concrete solidifies.

2. The slim hole piling slurry wall forming process according to claim 1, characterized in that, In the one-time impact drilling operation, the head of the drill rod (1) is aligned with the center of the pile foundation point, the hydraulic principle is used to impact the pile foundation point, and one-time drilling is carried out, and two workers respectively perform rechecking operations in the vertical direction during the construction process, so that the drill rod (1) always maintains a vertical direction.

3. The slim hole piling slurry wall forming process according to claim 2, characterized in that, In the one-time impact drilling operation, the hydraulic oil inlet energy and nitrogen compression energy of the hydraulic device of the excavator are used to drive the oil cylinder rod to hammer the drill rod (1), so that the drill rod (1) completes the drilling work on the foundation pile position, and when the drill rod (1) reaches the predetermined depth, the drill rod (1) is pulled out vertically, thereby completing the one-time drilling operation of the foundation hole.

4. The slim hole piling slurry wall forming process according to claim 1, characterized in that, In the foundation pouring operation, the concrete is poured into the hole position, and then a handheld vibrator is used to vibrate and compact the concrete in the hole, and after the concrete pouring construction is completed, the exposed part of the pile body is wrapped with a film and watered for maintenance.

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