Manual hole digging pile assembly type supporting system and construction method

Abstract

The invention discloses a manual hole digging pile assembly type supporting system and a construction method, the manual hole digging pile assembly type supporting system comprises a plurality of corrugated pipes, the corrugated pipes are sequentially and coaxially arranged and connected through flange plate bolts, corrugations on the corrugated pipes are of a variable corrugation structure, and the corrugated pipes are composed of a plurality of corrugated pipe pieces; the corrugated pipe pieces are sequentially connected through the bolts to form a ring in a surrounding mode, a permanent reinforced concrete supporting system is replaced with an assembly type supporting system, the material consumption can be reduced, construction is efficient, and the cost is low.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to an assembled support system of artificial bored piles and a construction method. Background Art

[0002] Manual bored pile is a method of pile foundation construction, which is to form a hole by manually digging the soil, and then pour concrete into the hole to form the pile body. The construction process includes determining the pile position, digging the soil in sections, pouring the retaining wall in sections, repeating the digging in sections, building the retaining wall to the designed depth, expanding the head at the bottom of the hole, hanging the steel cage, and pouring concrete to form the pile. The pile retaining wall usually uses C25 concrete with steel bars inserted. The first section is about one meter deep and the concrete casing is poured. When constructing downward, each section is regarded as a construction cycle. In order to ensure the verticality of the pile, it is required to check the center position and verticality of the pile once after pouring three sections of the retaining wall. Manual bored pile underground working conditions are poor, the environment is harsh, and the labor intensity is high. Safety and quality are of vital importance.

[0003] The current artificial bored pile construction support has the following problems:

[0004] 1. The construction environment of manual bored piles is poor, the work is heavy and the efficiency is low;

[0005] 2. The reinforced concrete wall protection project is large in quantity, high in strength, and wastes materials;

[0006] 3. The overall integrity of bored pile support is poor, quality control is difficult, and the safety risk is high. Summary of the invention

[0007] In view of the above-mentioned technical problems existing in the existing reinforced concrete wall protection, the purpose of the present invention is to provide an assembled support system and construction method for bored piles. The assembled support system is used to replace the permanent reinforced concrete support system, which can save material consumption, and has efficient construction and low cost.

[0008] In order to achieve the above-mentioned purpose, the present invention provides an assembled support system for bored piles, comprising a plurality of corrugated pipes, which are coaxially arranged in sequence and connected by flange bolts, the corrugations on the corrugated pipes adopt a variable corrugation structure, and the corrugated pipes are composed of a plurality of corrugated pipe segments, which can be connected in sequence by bolts to form a ring.

[0009] Furthermore, the corrugated pipe segment is in the shape of an arc-shaped pipe segment, and connecting plates are respectively provided at both ends of the corrugated pipe segment along the height direction. The connecting plates are sequentially provided with a plurality of connecting holes, and two adjacent corrugated pipe segments are connected and fixed by the connecting plates at the ends.

[0010] Furthermore, it is characterized in that the connection between the two adjacent corrugated pipe sheets is evenly coated with waterproof sealant.

[0011] Furthermore, the top and bottom of the bellows segments are provided with arc-shaped flange sections, and a number of bolt holes are equidistantly arranged on the flange sections. By connecting a number of bellows segments into a ring, the flange sections on the bellows segments can cooperate to form a flange, and adjacent bellows are connected via the flanges formed at the ends.

[0012] Furthermore, the inner wall of the corrugated tube is provided with a plurality of hanging rings.

[0013] Furthermore, the corrugated pipe segments are formed by hot pressing of steel materials, and the surface of the corrugated pipe segments is galvanized.

[0014] Furthermore, the corrugations on the bellows may be circular corrugations or flat corrugations. The circular corrugations are formed by a plurality of circular rings interlaced in sequence to form a ring shape, and the flat corrugations are formed by a plurality of elliptical rings interlaced in sequence to form a ring shape.

[0015] In order to achieve the above object, the construction method of the manual bored pile prefabricated support system provided by the present invention is used for any one of the above items, and the construction method comprises:

[0016] S1: Prefabricate corrugated pipes of different depths according to the soil pressure changes at the corresponding pile points in the geological survey report;

[0017] S2: According to the design drawings and actual site conditions, use measuring instruments to accurately lay out the center line of the pile position and set up guard piles for verification during the construction process;

[0018] S3: Use pickaxes, shovels and other tools to perform manual hole digging. During the hole digging process, the diameter and verticality of the pile hole should be controlled according to the design requirements, and the hole wall support should be carried out in time every 1m of digging;

[0019] S4: After the first meter of excavation is completed, the corrugated pipe segments are placed and assembled piece by piece. The verticality of each segment needs to be checked. After the first section of the corrugated pipe is assembled, the overall verticality is checked again, and the flange screw is flexibly used to adjust the verticality. After the adjustment is completed, the gap is sealed with sealing and waterproof materials;

[0020] S5: After the first section of excavation is completed, the wall protection work needs to be done in time, and the thickness should be increased on the basis of the standard thickness. A concrete protection ring for the hole mouth should be set above the ground elevation to prevent rainwater from flowing back into the hole. A vertical transport rack, buckets, lighting, movable covers, water pumps and ventilators, etc. should be installed;

[0021] S6: Check the corresponding depth corrugation selection, repeat S4 steps, hoist matching corrugated pipe prefabricated components piece by piece, connect adjacent corrugated pipes through flanges, excavate layer by layer and complete support, repeat the operation until the designed depth, check the bearing layer and expand the bottom;

[0022] S7: During the concrete pouring process, the prefabricated support system needs to be dismantled in sections. During the pouring process, the corrugated pipe is hoisted at the same time, and the hoisting points are fixed on the two symmetrical hoisting rings of the uppermost corrugated pipe. When pouring the bottom section of concrete, the support system is lifted 1m, and two more hoisting points are added and fixed on the symmetrical hoisting rings of the second section of the corrugated pipe to dismantle the first section of the corrugated pipe. Continue to pour the pile body concrete and repeat this process until the prefabricated support system is dismantled.

[0023] S8: Maintain the pile concrete.

[0024] The artificial bored pile prefabricated support system and construction method provided by the present invention adopts the prefabricated support system to replace the permanent reinforced concrete support system, which can save material consumption, and has high construction efficiency and low cost.

[0025] In addition, corrugated steel has higher strength than traditional steel, and the use of variable corrugation configuration can minimize the amount of steel used compared to uniform corrugation configuration, and can adapt to different lateral soil pressures and geological conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0027] Figure 1 A schematic diagram of the overall structure of the artificial bored pile assembly support system provided by the present invention;

[0028] Figure 2 A schematic diagram of the top view of the assembled support system of the artificial bored pile provided by the present invention;

[0029] Figure 3 A schematic diagram of the structure of the lifting ring in the assembled support system of the artificial bored pile provided by the present invention;

[0030] Figure 4 A schematic diagram of circular corrugations in the prefabricated support system of bored piles provided by the present invention;

[0031] Figure 5 A schematic diagram of the structure of the flat corrugations in the prefabricated support system of bored piles provided by the present invention.

[0032] Illustration Description:

[0033] Bellows 100;

[0034] Bellows segment 110 , connecting plate 111 , flange segment 112 , bolt hole 112 a , lifting ring 120 , circular corrugation 130 , circular ring 131 , flat corrugation 140 , elliptical ring 141 . DETAILED DESCRIPTION

[0035] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below with reference to specific diagrams.

[0036] See also Figure 1 , which is a schematic diagram of the structure of the artificial bored pile prefabricated support system provided by the present invention.

[0037] According to the figure, the prefabricated support system of the artificial bored pile provided by the present invention includes a plurality of corrugated pipes 100, which are used to be installed in each section of the pile hole excavated by the artificial bored pile to support the inner wall of the pile hole and prevent the inner wall soil from collapsing. After a section of the pile hole is excavated, a section of the corrugated pipe 100 should be installed in time, and then the next section of the pile hole can be excavated downward.

[0038] Several bellows 100 are coaxially arranged in sequence and connected by flange bolts, and the corrugations on the bellows 100 adopt a variable corrugation structure;

[0039] The bellows 100 is composed of a plurality of bellows sheets 110, and the plurality of bellows sheets 110 are connected in sequence by bolts to form a ring;

[0040] Specifically, the corrugated pipe segment 110 is in the shape of an arc-shaped pipe segment, and connecting plates 111 are respectively provided at both ends of the corrugated pipe segment 110 along the height direction. The connecting plates 111 are provided with a plurality of connecting holes in sequence. By docking the connecting plates 111 at the ends of two adjacent corrugated pipe segments 110, the plurality of connecting holes on the two connecting plates 111 correspond in sequence, and a plurality of fasteners are passed through the connecting holes on the two connecting plates 111 in sequence to connect and fix the two adjacent corrugated pipe segments 110.

[0041] After the connection is completed, the connection between two adjacent corrugated pipe segments 110 is evenly coated with waterproof sealant to seal the two and prevent large leakage points from occurring during the construction process.

[0042] In actual application, in the pile hole excavated manually, several corrugated pipe sheets 110 are sequentially butted and detachably connected through the connecting plate 111 to realize the assembly of the corrugated pipe 100, and the outer wall of the corrugated pipe 100 abuts against the inner wall of the pile hole to support the pile hole;

[0043] Furthermore, the top and bottom of the bellows segment 110 are both provided with an arc-shaped flange section 112, and a plurality of bolt holes 112a are sequentially and equidistantly provided on the flange section 112. By connecting a plurality of bellows segments 110 into a ring, the flange sections 112 on the plurality of bellows segments 110 can cooperate to form a flange, so that when the bellows 100 are vertically butt-jointed, the adjacent bellows 100 are connected through the flanges formed at the ends;

[0044] In actual application, the corrugated pipe 100 is installed in the first pile hole, and then the next pile hole is excavated downwards. After the next pile hole is excavated, the corrugated pipe 100 is installed in the pile hole and docked with the corrugated pipe 100 in the first pile hole and connected through a flange.

[0045] Furthermore, in order to facilitate the installation and disassembly of the bellows 100, a plurality of lifting rings 120 are provided on the inner wall of the bellows 100. In this embodiment, four lifting rings 120 are preferably installed symmetrically for use in assembly-type lifting and disassembly construction.

[0046] Furthermore, in this example, the outer diameter of the corrugated pipe 100 is preferably 1200 mm, and the thickness is preferably 35 mm. The outer diameter and thickness can be adjusted according to the diameter of the bored pile; each ring of the pipe segment is 1 m deep, which can ensure a safe working space under the excavation depth;

[0047] The variable corrugated structure on the surface of the bellows 100 can be flexibly set to adapt to different burial depths and surrounding rock conditions. The waveform at a location with a shallow burial depth and low ground stress should be designed to be relatively gentle to save steel. The cross section of the bellows at a location with a large burial depth and high ground stress should be adjusted to a larger waveform to resist a greater active earth pressure. The waveform design should be specifically calculated according to different working conditions.

[0048] For example, in actual conditions, a relatively gentle waveform or even a non-corrugated steel pipe may be suitable for the 0-8-meter range; however, at the 9-meter level, the waveform needs to be adjusted to a larger value due to the presence of hard rock with large lateral earth pressure; at the 10-meter level, the waveform can be adjusted to a relatively gentle state due to the return to a clay layer with relatively uniform lateral pressure.

[0049] Furthermore, in this example, the corrugated pipe segment 110 is made of Q235 steel by hot pressing. After the material is formed, the corrugated pipe segment 110 is galvanized to extend the service life of the support structure.

[0050] In terms of mechanical properties, the bellows support structure can adjust and disperse the local yield of the material caused by the concentration of soil pressure stress due to the existence of its axial corrugations, thereby enhancing the bending and compression resistance of the overall support structure. According to different burial depths and surrounding rock characteristics, the corrugation configuration can be estimated according to the magnitude of the soil pressure acting on the support structure. The surface corrugations of the bellows 100 can be circular corrugations 130 or flat corrugations 140. The circular corrugations 130 are formed by a plurality of circular rings 131 interlaced in sequence to form a ring shape, and the flat corrugations 140 are formed by a plurality of elliptical rings 141 interlaced in sequence to form a ring shape.

[0051] For the circular corrugation 130 form, such as Figure 4 ,

[0052]

[0053] Wherein, F is the earth pressure load value (unit: N); dn is the inner diameter of the circular ring 131 (unit: mm).

[0054] For the flat corrugated 140 form, such as Figure 5 ,

[0055]

[0056] Where, de is the equivalent inner diameter of the flat corrugation,

[0057]

[0058] Wherein, b and h are the nominal inner major axis and minor axis of the elliptical ring 141, respectively.

[0059] Therefore, for the bored pile support structure in the shallow buried depth section, it is appropriate to use a flat corrugated configuration; while for the corrugated configuration under the deep buried depth or high ground stress state, it is appropriate to use a circular or partially circular corrugated configuration. The use of variable corrugated corrugated pipe support can minimize the amount of steel used while ensuring construction safety.

[0060] Based on the artificial bored pile prefabricated support system formed by the above scheme, this scheme also provides a construction method, and the construction steps are as follows:

[0061] S1: Prefabricate corrugated pipes 100 of different depths according to the soil pressure changes at the corresponding pile points in the geological survey report;

[0062] S2: According to the design drawings and actual site conditions, use measuring instruments to accurately lay out the center line of the pile position and set up guard piles for verification during the construction process;

[0063] S3: Use pickaxes, shovels and other tools to perform manual hole digging. During the hole digging process, the diameter and verticality of the pile hole should be controlled according to the design requirements, and the hole wall support should be carried out in time every 1m of digging;

[0064] S4: After the excavation of the first meter is completed, the corrugated pipe segments 110 are put in and assembled piece by piece. The verticality of each segment needs to be checked. After the first segment of the corrugated pipe 100 is assembled, the overall verticality is checked again, and the flange screw is flexibly used to adjust the verticality. After the adjustment is completed, the gap is sealed with a sealing waterproof material;

[0065] S5: After the first section of excavation is completed, the wall protection work must be done in time, and the thickness must be increased by 10 to 15 cm on the basis of the standard thickness. A hole mouth concrete protection ring is set 20 to 30 cm above the ground elevation, and it has a locking function to prevent rainwater from flowing back into the hole. Install the vertical transport frame, bucket, lighting, movable cover, water pump ventilator, etc.;

[0066] S6: Check the corresponding depth corrugation selection, repeat S4 step, hoist the matching corrugated pipe 100 prefabricated components piece by piece, connect the adjacent corrugated pipes 100 through flanges, excavate layer by layer and complete the support, cycle the operation until the designed depth, check the bearing layer and expand the bottom;

[0067] S7: During the concrete pouring process, the prefabricated support system needs to be dismantled in sections. During the pouring process, the corrugated pipe 100 is hoisted at the same time, and the hoisting points are fixed on the two symmetrical lifting rings 120 of the uppermost corrugated pipe 100. When pouring the lowest section of concrete, the support system is lifted 1m, and two more lifting points are added and fixed on the symmetrical lifting rings 120 of the second section of the corrugated pipe 100 to dismantle the first section of the corrugated pipe 100. Continue to pour the pile body concrete and repeat this process until the prefabricated support system is dismantled.

[0068] S8: Maintain the pile concrete.

[0069] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A prefabricated support system of bored piles, characterized in that: It comprises a plurality of bellows, which are coaxially arranged in sequence and connected by flange bolts. The corrugations on the bellows adopt a variable corrugation structure. The bellows are composed of a plurality of bellows sheets, which are connected in sequence by bolts to form a ring.

2. The artificial bored pile prefabricated support system according to claim 1 is characterized in that: The corrugated pipe sheet is in the shape of an arc-shaped pipe sheet. Both ends of the corrugated pipe sheet are respectively provided with connecting plates along the height direction. The connecting plates are sequentially provided with a plurality of connecting holes. Two adjacent corrugated pipe sheets are connected and fixed by the connecting plates at the ends.

3. The artificial bored pile prefabricated support system according to claim 1 is characterized in that: The connection between the two adjacent corrugated pipe segments is evenly coated with waterproof sealant.

4. The artificial bored pile prefabricated support system according to claim 1 is characterized in that: The top and bottom of the bellows sheet are both provided with arc-shaped flange sections, and a number of bolt holes are equidistantly arranged on the flange sections. By connecting a number of bellows sheets into a ring, the flange sections on the bellows sheets can cooperate to form a flange, and adjacent bellows are connected through the flanges formed at the ends.

5. The artificial bored pile prefabricated support system according to claim 1 is characterized in that: The inner wall of the corrugated pipe is provided with a plurality of hanging rings.

6. The artificial bored pile prefabricated support system according to claim 1 is characterized in that: The corrugated pipe sheet is formed by hot pressing of steel, and the surface of the corrugated pipe sheet is galvanized.

7. The artificial bored pile prefabricated support system according to claim 1 is characterized in that: The corrugations on the bellows may be circular corrugations or flat corrugations. The circular corrugations are formed by a plurality of circular rings interlaced in sequence to form a ring shape, and the flat corrugations are formed by a plurality of elliptical rings interlaced in sequence to form a ring shape.

8. A construction method for a prefabricated support system of artificial bored piles, characterized in that: include: S1: Prefabricate corrugated pipes of different depths according to the soil pressure changes at the corresponding pile points in the geological survey report; S2: According to the design drawings and actual site conditions, use measuring instruments to accurately lay out the center line of the pile position and set up guard piles for verification during the construction process; S3: Use pickaxes, shovels and other tools to perform manual hole digging. During the hole digging process, the diameter and verticality of the pile hole should be controlled according to the design requirements, and the hole wall support should be carried out in time every 1m of digging; S4: After the first meter of excavation is completed, the corrugated pipe segments are placed and assembled piece by piece. The verticality of each segment needs to be checked. After the first section of the corrugated pipe is assembled, the overall verticality is checked again, and the flange screw is flexibly used to adjust the verticality. After the adjustment is completed, the gap is sealed with sealing and waterproof materials; S5: After the first section of excavation is completed, the wall protection work needs to be done in time, and the thickness should be increased on the basis of the standard thickness. A concrete protection ring for the hole mouth should be set above the ground elevation to prevent rainwater from flowing back into the hole. A vertical transport rack, buckets, lighting, movable covers, water pumps and ventilators, etc. should be installed; S6: Check the corresponding depth corrugation selection, repeat S4 steps, hoist matching corrugated pipe prefabricated components piece by piece, connect adjacent corrugated pipes through flanges, excavate layer by layer and complete support, repeat the operation until the designed depth, check the bearing layer and expand the bottom; S7: During the concrete pouring process, the prefabricated support system needs to be dismantled in sections. During the pouring process, the corrugated pipe is hoisted at the same time, and the hoisting points are fixed on the two symmetrical hoisting rings of the uppermost corrugated pipe. When pouring the bottom section of concrete, the support system is lifted 1m, and two more hoisting points are added and fixed on the symmetrical hoisting rings of the second section of the corrugated pipe to dismantle the first section of the corrugated pipe. Continue to pour the pile body concrete and repeat this process until the prefabricated support system is dismantled. S8: Maintain the pile concrete.

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