CN213014258U - Drilling and filling structure for flow-plastic sludge layer - Google Patents
Drilling and filling structure for flow-plastic sludge layer Download PDFInfo
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- CN213014258U CN213014258U CN202021504390.3U CN202021504390U CN213014258U CN 213014258 U CN213014258 U CN 213014258U CN 202021504390 U CN202021504390 U CN 202021504390U CN 213014258 U CN213014258 U CN 213014258U
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Abstract
The utility model provides a flow and mould form silt layer drilling and filling structure belongs to the construction field, be in including drilling and setting bored concrete pile body in the drilling, the cover is equipped with on the bored concrete pile body and protects a section of thick bamboo, it is located the flow and moulds the form silt layer to protect a section of thick bamboo, just the tip that protects a section of thick bamboo is worn out the flow and is moulded the form silt layer. The utility model adopts the method that the protective cylinder passes through the flow-plastic sludge layer to protect the wall, has simple process, can improve the construction effect, further shortens the construction period and reduces the cost; after the pile casing is adopted for protecting the wall, the volume of the poured concrete meets the design requirement, abnormal phenomena such as waste holes and sudden uplift of surrounding buildings caused by difficulty in descending of a reinforcement cage do not occur after hole forming, and the detection result shows that the shape of the pile body is cylindrical through on-site pile foundation PDA detection, the pile body is regular, the integrity of the pile body is excellent, and the bearing capacity of the pile foundation meets the design and use requirements.
Description
Technical Field
The utility model belongs to the building construction field, concretely relates to flow and mould form silt layer drilling and filling structure.
Background
The cast-in-situ bored pile is formed through mechanical or artificial hole forming, steel bar setting and concrete pouring. Compared with the precast pile, the cast-in-place pile has the characteristics of no limitation of stratum change, no need of pile extension and pile cutting, strong adaptability, relatively stable stress and the like. The cast-in-place pile has the advantages of no negative soil squeezing effect, capability of penetrating through various hard interlayers, rock embedding and entering various hard bearing layers, large adjustable space of the geometric dimension of the pile and the bearing capacity of a single pile and the like, so that the cast-in-place pile is used as a pile foundation for high-rise buildings, important buildings and the like at home and abroad at present, namely the cast-in-place pile has a wide application range.
The cast-in-situ bored pile is formed by immediately putting down a reinforcement cage after pore forming and pouring concrete, but when the geological condition is a thick flow-plastic sludge layer, the phenomenon of wall protection failure after pore forming is often encountered, so that the problems of hole collapse, necking and expanding, serious concrete pouring square exceeding the design requirement, abnormal pile body shape and other construction quality are caused.
The existing retaining wall method comprises the following steps: the method for carrying out foundation precipitation curing treatment on the flow-plastic sludge layer and adopting special chemical primary pulp for wall protection, but the method for carrying out foundation precipitation curing treatment on the flow-plastic sludge layer has the defects of high investment cost and long construction period; the method of chemical pulp wall protection can lead the whole construction period to be seriously delayed sometimes because of shortage of chemical pulping materials.
SUMMERY OF THE UTILITY MODEL
Based on the above background problem, the utility model aims at providing a flow and mould form silt layer drilling and filling structure sinks into a protective barrel in drilling and makes it pass and flow and mould form silt layer and carry out the dado, under the prerequisite of guaranteeing engineering quality, time limit for a project, safety and saving cost, has solved the construction quality problem that present drilling bored concrete pile exists.
In order to achieve the above object, on the one hand, the embodiment of the present invention provides a technical solution:
the cast-in-place pile structure comprises a cast-in-place pile body in the drill hole, wherein a protective cylinder is sleeved on the cast-in-place pile body and is located on the flow-plastic sludge layer, and the end part of the protective cylinder penetrates out of the flow-plastic sludge layer.
In one embodiment, the inner diameter of the casing is the same as the designed diameter of the cast-in-place pile body.
In one embodiment, the ratio of the outer diameter of the casing to the inner diameter of the borehole is 0.95-0.97: 1.
In one embodiment, the length of the casing exit flow-plastic sludge layer is 0.8 to 1.2 m.
In one embodiment, a reinforcement cage is radially arranged in the casing, and the reinforcement cage extends to the bottom end of the cast-in-place pile body.
In one embodiment, the wall thickness of the casing is 4-6 mm.
In one embodiment, the casing is made of steel.
Compared with the prior art, the embodiment of the utility model provides a have following effect at least:
1. the utility model discloses a filling structure establishes a section of thick bamboo including protecting a section of thick bamboo, the cover promptly on the bored concrete pile body protects a section of thick bamboo, protects a section of thick bamboo and is located the flow and moulds the form silt layer, the utility model discloses a protect a section of thick bamboo and pass the method that the flow was moulded the form silt layer and carry out the dado, the process is simple, can improve the construction effect, and then reduction of erection time, reduce cost.
2. The utility model discloses a protect a dado after, the volume of concrete poured accords with the design requirement, the steel reinforcement cage that does not appear after the pore-forming transfers the difficulty and leads to unusual phenomena such as useless hole, building on every side do not appear suddenly uplift to detect through on-the-spot pile foundation PDA, testing result shows that pile body shape is cylindrical, pile body rule, and pile body integrality is good, and pile foundation bearing capacity accords with the design operation requirement.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below.
FIG. 1 is a schematic view of a flow-plastic type sludge layer drilling and grouting structure in embodiment 1 of the present invention;
fig. 2 is a diagram of the PDA detection result of the bored concrete pile according to embodiment 3 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", "outer", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings of the specification, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. It should be further noted that the description of the terms "first," "second," etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated.
In order to solve the defect that current dado method exists, the utility model discloses an immerse the casing in the hole to make the casing pass the method that flows the plastic form silt layer and carry out the dado, under the prerequisite of guaranteeing engineering quality, time limit for a project, safety and saving cost, solved the construction quality problem that present drilling bored concrete pile exists.
The present invention will be described in detail with reference to the following embodiments.
Example 1
The utility model provides a form silt layer drilling perfusion structure is moulded to flow, as shown in figure 1, including drilling, the bored concrete pile body 1 of setting in the drilling, the cover is equipped with on the bored concrete pile body 1 and protects a section of thick bamboo 2, it is located the form silt layer 100 is moulded to flow to protect a section of thick bamboo 2, just the tip of protecting a section of thick bamboo 2 wears out the form silt layer 100 is moulded to flow, wear to be equipped with steel reinforcement cage 3 along the axial in the bored concrete pile body 1, steel reinforcement cage 3 extends to the bottom of bored concrete pile body 1.
In this embodiment, the inner diameter of the casing 2 is the same as the designed diameter of the cast-in-place pile body, the ratio of the outer diameter of the casing 2 to the inner diameter of the drilled hole is 0.95:1, the length of the casing 2 penetrating out of the flow-plastic sludge layer is 1.2m, the casing 2 is made of steel, and the wall thickness of the casing 2 is 4 mm.
It should be noted that, in the present embodiment, the parameters of the casing 2 are described by way of example only, and are not limited to the parameters of specific use, and the outer diameter, the wall thickness and the length of the flow-out plastic sludge layer of the casing 2 can be adjusted according to the use condition.
This embodiment is through protecting 2 dado of a section of thick bamboo, can guarantee that the pile body shape of bored concrete pile body 1 is cylindrical, and pile body rule, pile body integrality are good, and pile foundation bearing capacity accords with design operation requirement.
Example 2
The construction method of the flow-plastic sludge layer drilling and pouring structure in the embodiment 1 comprises the following steps:
(1) determining the position and depth of the flow-plastic sludge layer
And (4) judging the specific position of the flow-plastic sludge layer according to the site survey report and the problems of the current cast-in-place pile.
(2) Drilling holes
The diameter that this embodiment designed bored concrete pile is 800mm, and in order to guarantee to become the drill way and sink smoothly into the casing, this embodiment changes the drill bit of original 730mm into 780mm when drilling, and the pore-forming diameter is about 840 mm.
(3) After the hole is formed, the protective cylinder is used for protecting the wall
Firstly, determining specification model and material of protective cylinder
The material of the protective cylinder is Q235-B, the thickness is 5mm, the protective cylinder is too thin and is easy to deform due to the pressure of lateral pressure generated when the protective cylinder penetrates through a flow-plastic sludge layer, so that the diameter of the pile does not meet the requirement, and the splicing speed and the lifting of the protective cylinder are influenced if the protective cylinder is too thick. The protective cylinder is rolled and welded by steel plates on site, and all the protective cylinders are sealed and welded. The inner diameter of the pile casing is 800mm consistent with the designed diameter of the cast-in-place pile, the length of the pile casing is determined according to geological conditions, and the placement depth of the pile casing is preferably about 1m from the flow-plastic sludge layer to the clay layer.
Selection of construction machinery
The 55t crawler crane is used, the protective cylinder is timely sunk after the hole is formed by utilizing the characteristics of convenient movement and lifting, and the protective cylinder can be repeatedly lifted and then sunk to ensure that the protective cylinder is placed at a specified position if the protective cylinder is blocked in the sinking process.
Quality control during sinking of protective cylinder
After the bored concrete pile is formed into a hole, a guide immersed tube support is installed in a backfill soil area, a preformed hole is reserved on the guide immersed tube support, a protective cylinder is immersed into a flow-plastic sludge layer through the preformed hole at one time, the perpendicularity and concentricity of the protective cylinder need to be guaranteed in the process of immersing the protective cylinder, and the perpendicularity of a pile body of the bored concrete pile after the bored concrete pile is formed is guaranteed by whole-process monitoring of two theodolites.
(4) And after the wall protection cylinder is successfully placed, timely placing a reinforcement cage and pouring concrete.
Example 3
The cast-in-place structure of embodiment 1 is applied to the construction of concrete cast-in-place piles of a turbine foundation and a main plant A row column foundation of a certain project, the diameter of the designed pile is phi 800mm, the length of the designed effective pile is not less than 33m, the depth of a pile end holding layer is not less than 7m, a reinforcing cage which is phi 650mm and matched with the pile is designed, the type of concrete is K-300 (which is equal to domestic C30), the thickness of a pile body concrete protective layer is 65mm, the pile body is a friction end layer pile, and the total number of piles is 39. The actual pile length is 34m-36m, and the depth of the cast-in-place pile (calculated by the elevation of the designed excavated earthwork being-5.1 m) is 33m-35 m.
(1) Geological conditions
The original landform is a pond and a marshland, the elevation of the original terrace is about +1.00-1.50m, and the elevation of the designed field is +6.0 m.
According to the preliminary field exploration, the ground on the lower part of the site planned in a factory can be roughly divided into four layers, and the conditions of all layers from the ground to the bottom are roughly as follows:
the first layer, sludge layer, is yellow brown, very soft, and has fine sand locally, the standard penetration number NSPT is about 1 hit, and the thickness is about 1 m.
The second layer, a sludge layer, is gray, rich in organic matters, very soft, and partially filled with fine sand, the standard penetration number NSPT is less than 1 impact, the depth is 11-21m, and the thickness is about 10-20 m.
The third layer, clay layer, is yellow brown, and has fine sand in part, penetration number NSPT of about 6-16, depth of 12-27m, and thickness of 3-4 m.
And the fourth layer is a weathered rock layer, is gray and partially shale, has a standard penetration number NSPT of about 30-50 impact and a depth of 24-33m, is a pile foundation support layer, and has a thickness which is not drilled through in the exploration of the time. Individual boreholes revealed that the formation was found to be medium grit with a penetration number NSPT of about 30-50 strokes, dense.
The soil body is softer within the depth range of twenty meters or more in a plant area, the characteristic value of the bearing capacity of the foundation is 40-50KPa, the original geological condition is a swamp silt land, and the soil belongs to a silt soft foundation, and because of engineering requirements, the original foundation of the whole plant is fully filled with yellow clay, and the height is 4 meters.
(2) Perfusion method
a. Determining the position and depth of the flow-plastic sludge layer
According to the site survey report and the problems of the existing cast-in-place pile, the specific position of the flow-plastic sludge layer is judged to be about-4.9 m to-25.9 m in elevation and the thickness is about 18 m to 21 m.
(2) Drilling holes
The diameter that this embodiment designed bored concrete pile is 800mm, and in order to guarantee to become the drill way and sink smoothly into the casing, this embodiment changes the drill bit of original 730mm into 780mm when drilling, and the pore-forming diameter is about 840 mm.
(3) After the hole is formed, the protective cylinder is used for protecting the wall
Firstly, determining specification model and material of protective cylinder
The material of the protective cylinder is Q235-B, the thickness is 5mm, the protective cylinder is too thin and is easy to deform due to the pressure of lateral pressure generated when the protective cylinder penetrates through a flow-plastic sludge layer, so that the diameter of the pile does not meet the requirement, and the splicing speed and the lifting of the protective cylinder are influenced if the protective cylinder is too thick. The protective cylinder is rolled and welded by steel plates on site, and all the protective cylinders are sealed and welded. The inner diameter of the pile casing is 800mm consistent with the designed diameter of the cast-in-place pile, the length of the pile casing is determined according to geological conditions, the placement depth of the pile casing is preferably about 1m when the pile casing penetrates through a flow-plastic sludge layer and enters a clay layer, and the length of the pile casing is 23m according to actual geological conditions on site.
Selection of construction machinery
The 55t crawler crane is used, the protective cylinder is timely sunk after the hole is formed by utilizing the characteristics of convenient movement and lifting, and the protective cylinder can be repeatedly lifted and then sunk to ensure that the protective cylinder is placed at a specified position if the protective cylinder is blocked in the sinking process.
Quality control during sinking of protective cylinder
After the cast-in-place pile is formed into a hole, a guide immersed tube support is installed in a backfill area at an elevation of-4.9 m, a reserved hole is reserved on the guide immersed tube support, a pile casing is immersed into the position with the elevation of-26.9 m from the reserved hole at one time, the perpendicularity and concentricity of the pile casing need to be guaranteed in the process of immersing the pile casing, and the perpendicularity of a pile body after the cast-in-place pile is formed is guaranteed through whole-process monitoring by two theodolites.
(4) And after the wall protection cylinder is successfully placed, timely placing a reinforcement cage and pouring concrete.
(5) Pile foundation detection
After the construction of the cast-in-place pile is completed and the maintenance period of the concrete reaches 28 days, 100% of PDA (personal digital assistant) detection of the pile foundation (pile body integrity and pile foundation bearing capacity detection) is carried out so as to detect the pile forming quality of the cast-in-place pile after the pile casing is adopted for wall protection. The shape of the pile body is mainly detected because whether the shape of the pile body is regular or not is one of key indexes for judging the success of the retaining wall.
(6) The result of the detection
After the pile casing penetrates through the flow-plastic sludge layer to perform wall protection, the volume of poured concrete meets the design requirement, abnormal phenomena such as waste holes caused by the fact that a steel reinforcement cage is difficult to descend and sudden uplift of surrounding buildings do not occur after hole forming, PDA (personal digital assistant) detection is performed on four poured piles formed by the wall protection method randomly in a site and in regions, the detection method is conventional operation in the field, the detection structure is shown in figure 2, the detection result shows that the pile body is cylindrical, the pile body is regular, the integrity of the pile body is excellent, the bearing capacity of the pile foundation exceeds the preset design requirement, the service performance is met, and the detection result is specifically shown in table 1.
TABLE 1 summary table for wall protection situation of pile casing in cast-in-place pile construction
Comparative example
Comparative example unlike example 3, which used a conventional slurry retaining wall, the pouring results were as follows:
the volume of concrete poured in the interval from the clay layer to the weathered rock stratum from the elevation of minus 25.9m to minus 38.9m is 7.5m3-8.3m3Meets the design requirement (the design concrete volume is 7m3)。
The volume of concrete pouring in the range of elevation of-11 m to-25.9 m of the flow plastic sludge layer is 17.1m3-23m3The volume of concrete poured is seriously over-standard (the designed volume of concrete is 8.2 m)3) The volume of concrete pouring in the interval of-4.9 m to-11 m of the elevation of the flow plastic sludge layer is 19.7m3-28.7m3The volume of concrete poured is seriously beyond the standard (the designed volume of concrete is 3.2 m)3)。
And (3) the clay layer with the elevation of-25.9 m to-38.9 m reaches a weathered rock stratum, the wall protection condition of the area is complete due to the hard and fixed geology of the area, and the concrete pouring amount meets the design requirement.
The flow-plastic sludge layer with the elevation ranging from-4.9 m to-25.9 m is extremely unstable, the volume of concrete seriously exceeds the design requirement, and particularly in the range from-4.9 m to-11 m, because the dead weight of the top concrete exceeds the critical value which can be borne by the hole wall after the concrete is poured into the hole to a certain height, the concrete is seriously lost and diffused, so that the volume of the poured concrete exceeds the design requirement by 6-8 times, and the hole wall is easy to collapse after the concrete is poured, so that the concrete is diffused, and therefore, the protection of the wall in the area is unsuccessful.
Meanwhile, through the PDA detection of the on-site pile foundation, the detection result shows that the pile body is irregular, the sectional area of the pile body is variable, and the phenomenon of neck expansion and shrinkage is caused, and the details are shown in the table 2.
TABLE 2 summary table of conventional mud wall protection conditions for cast-in-place pile construction
Comparative example 3 and comparative example can see out, the utility model discloses a method dado in the casing counter bore can make bored concrete pile body shape be cylindrically, and pile body rule, pile body integrality are good, and pile foundation bearing capacity accords with design operation requirement.
It should be noted that, for those skilled in the art, without departing from the inventive concept, several variations and modifications can be made, which are within the scope of the present invention.
Claims (7)
1. The flow-plastic sludge layer drilling and pouring structure comprises a drilling hole and a pouring pile body arranged in the drilling hole, and is characterized in that a protective cylinder is sleeved on the pouring pile body and is positioned on the flow-plastic sludge layer, and the end part of the protective cylinder penetrates out of the flow-plastic sludge layer.
2. The cast-in-situ sludge blanket drilling and grouting structure as claimed in claim 1, wherein the inner diameter of the casing is the same as the designed diameter of the cast-in-situ pile body.
3. The flow-plastic sludge layer drilling and grouting structure as claimed in claim 2, wherein the ratio of the outer diameter of the casing to the inner diameter of the drilled hole is 0.95-0.97: 1.
4. The drilling and grouting structure for a flow-plastic sludge layer as claimed in claim 1, wherein the length of the casing penetrating out of the flow-plastic sludge layer is 0.8-1.2 m.
5. The cast-in-situ bored concrete structure of a flowing plastic sludge layer according to claim 1, wherein a reinforcement cage is radially provided in the casing, the reinforcement cage extending to the bottom end of the cast-in-situ pile body.
6. The flow-plastic sludge layer drilling and grouting structure as claimed in claim 1, wherein the wall thickness of the casing is 4-6 mm.
7. The flow-plastic sludge layer drilling and pouring structure as claimed in claim 1, wherein the casing is made of steel.
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| CN202021504390.3U CN213014258U (en) | 2020-07-27 | 2020-07-27 | Drilling and filling structure for flow-plastic sludge layer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111764378A (en) * | 2020-07-27 | 2020-10-13 | 中国电建集团江西省电力建设有限公司 | Drilling and wall protecting method, pouring method and pouring structure for flow-plastic sludge layer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111764378A (en) * | 2020-07-27 | 2020-10-13 | 中国电建集团江西省电力建设有限公司 | Drilling and wall protecting method, pouring method and pouring structure for flow-plastic sludge layer |
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