CN211228467U - Circular cross section concrete precast pile cap - Google Patents
Circular cross section concrete precast pile cap Download PDFInfo
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- CN211228467U CN211228467U CN201921800484.2U CN201921800484U CN211228467U CN 211228467 U CN211228467 U CN 211228467U CN 201921800484 U CN201921800484 U CN 201921800484U CN 211228467 U CN211228467 U CN 211228467U
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Abstract
The utility model relates to a circular section concrete precast pile cap; comprises a pile cap body which is prefabricated and formed by concrete, and is characterized in that the section of the pile cap body has a diameter D1The center of the pile cap body is provided with an assembly hole, and the assembly hole is of an equal-diameter hole structure; diameter D of the assembly hole2Larger than the outer diameter D of the cross section of the cylindrical pile foundation3Or the diagonal length D of the cross section of the square pile foundation4(ii) a Pile capTwo pieces of profile steel which are arranged in parallel are pre-embedded in the lower end part of the body, and the profile steel penetrates through the assembly hole; the top surface of the pile cap body is embedded with three hanging rings, the included angle between each hanging ring and the circle center connecting line is 120 degrees, and the hanging rings are embedded in (D)1‑D2) The/2 position; the rings are recessed into the pile cap body, and the tops of the rings are flush with the top surface of the pile cap. The utility model has the advantages of practice thrift the template, improve pile cap construction speed, guarantee pile cap construction quality, save the cost.
Description
Technical Field
The utility model belongs to the water conservancy project field is applicable to high pile wharf structure, especially relates to a prefabricated pile cap of circular cross section concrete.
Background
The pile cap is a reinforced concrete member applied to a high-pile wharf structure, and when a pile platform of the high-pile wharf is a prefabricated mounting structure, the pile cap is required to be arranged at the top end of a pile in order to facilitate the mounting of a prefabricated beam or a prefabricated plate, namely, the pile cap is a reinforced concrete member for connecting the pile and the beam (or the prefabricated plate). Since the pile driving on water is much more deviated than on land, another important function of the pile cap is to adjust the deviation of the pile top elevation and position generated when driving the pile.
The pile cap is made of cast-in-place reinforced concrete, the plane size of the pile cap is mainly determined by the arrangement form of the foundation pile, the section size of the pile and the deviation of the pile, and the requirements of the laying length of the precast beam and the slab and the width of the joint are met. But cast-in-place reinforced concrete pile caps need construction on water, and the main steps are that the piles are used as supporting structures, construction platforms are erected on the supporting structures, templates are installed, reinforcing steel bars are bound, concrete is poured, and the templates are removed after maintenance for a certain time. The construction steps of cast-in-place reinforced concrete pile caps of the high-pile wharf are complicated, the requirement on water stop of the template is high, if the template does not stop water, water enters the template when the water level rises, the concrete strength of the pile caps is obviously reduced, and the 'bean curd residue' pile caps are formed.
In recent years, with the progress of offshore piling and positioning technology, the deviation error of piling is effectively controlled, and with the popularization and application of an assembly type structure, a prefabricated reinforced concrete pile cap is also proposed.
The plane form of the pile cap is generally square, when a prestressed concrete pipe pile or a steel pipe pile is adopted, the pile cap can be made into a round shape, and when a plurality of rows of piles are adopted, the pile cap can be made into a polygon or other forms so as to save the manufacturing cost. At present, in the construction of a high-pile wharf, a template of a square pile cap is convenient to process, install and disassemble, and has high repeated utilization rate, so that the application is wide, and the application of a circular pile cap is very little. But the circular pile cap has the advantages of raw material saving, no corner falling defect and the like.
The defects of the prior art mainly comprise the following points:
(1) the construction steps of the cast-in-place reinforced concrete pile cap are complicated, the construction speed is reduced, the requirement on water stop of the template is high, and the construction difficulty is increased.
(2) When the prefabricated pile cap is constructed, the hoisting in-place precision is poor, the elevation and the inclination of the pile cap cannot be accurately controlled, and slurry leakage is easy to occur when the node between the pile cap and the pile top is poured, so that the engineering application of the prefabricated pile cap is limited.
(3) The circular pile cap is limited by high requirement on the processing precision of the template, low repeated utilization rate and the like, and the engineering application is few.
The applicant designs and develops a circular section steel reinforced concrete precast pile cap which solves the problems.
For the cast-in-place reinforced concrete pile cap, the installation steps are mainly as follows: the upper part of a pile foundation is provided with a supporting structure, a steel pipe pile is generally welded with a steel bracket or a bracket, and a reinforced concrete pile is provided with a reverse hoisting device and the like; installing a steel template or a combined template on the supporting structure; after pile cap reinforcing steel bars are bound in two layers, commercial concrete is poured on site by using a ground pump or a pump truck. The prefabricated pile cap is applied to few projects at present.
In summary, the problems of the existing installation method are as follows:
(1) the construction steps of the cast-in-place reinforced concrete pile cap are complicated, and the construction speed is slow.
(2) On-site construction is susceptible to weather.
(3) Construction steps on water are multiple, and risks are high.
In order to solve the technical problem the utility model provides a practice thrift the template, improve pile cap construction speed, guarantee pile cap construction quality, save the circular cross section concrete precast pile cap of cost.
Disclosure of Invention
Aiming at the problems in the prior art, the utility model provides a circular section concrete precast pile cap which saves templates, improves the construction speed of the pile cap, ensures the construction quality of the pile cap and saves the manufacturing cost,
the utility model is realized in such a way that a circular section concrete precast pile cap; comprises a pile cap body which is prefabricated and formed by concrete, and is characterized in that the section of the pile cap body has a diameter D1The center of the pile cap body is provided with an assembly hole, and the assembly hole is of an equal-diameter hole structure; diameter D of the assembly hole2Larger than the outer diameter D of the cross section of the cylindrical pile foundation3Or the diagonal length D of the cross section of the square pile foundation4(ii) a Two pieces of profile steel which are arranged in parallel are pre-embedded in the lower end part of the pile cap body, and the profile steel penetrates through the assembly hole; the top surface of the pile cap body is embedded with three hanging rings, the included angle between each hanging ring and the circle center connecting line is 120 degrees, and the hanging rings are embedded in (D)1-D2) The/2 position; the rings are recessed into the pile cap body, and the tops of the rings are flush with the top surface of the pile cap.
Above-mentioned technical scheme is preferred, the diameter ratio of pilot hole is 5 ~ 15cm big than cylinder pile foundation cross section external diameter or square pile foundation cross section diagonal length, and the upper end cartridge of the pile foundation of being convenient for is in the pilot hole of prefabricated pile cap.
Preferably, the section steel is I-shaped steel or channel steel, and plays a role of a carrying pole beam to transfer the dead weight of the pile cap to the pile foundation, so that the overwater construction step of arranging a support structure at the upper part of the pile foundation is avoided; the section steel mark is determined by calculation according to stress.
The technical scheme is preferable, and the distance L between the bottom surface of the section steel and the bottom surface of the pile cap1The thickness is 50mm, and the integrity of the pile and the pile cap is increased; spacing L of two sections2Is D3/2 (cylindrical pile) or D4And/2 (square pile foundation) to maintain the stability of the pile cap when it is installed on the pile top.
According to the technical scheme, the edge of the lower end part of the pile cap body is provided with the chamfer, so that collision is prevented, and the consumption of concrete is saved.
The utility model has the advantages and technological effect: compared with the prior art, the utility model have following advantage:
(1) the pile cap with the circular section is adopted, so that the raw materials can be saved, and the defects of concrete corner drop and the like of the pile cap in the service life can be avoided.
(2) The pile cap is prefabricated in a prefabrication factory, so that construction under severe weather conditions is avoided, and the quality of the pile cap is ensured.
(3) The process of installing the template on water is omitted, the template is saved, the construction speed is increased, and the manufacturing cost is obviously saved.
Drawings
Fig. 1 is a schematic structural view of the prefabricated pile cap of the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a schematic view of a precast pile cap installation structure;
FIG. 4 is a top view of FIG. 3;
FIG. 5 is a view of a ferrule construction;
FIG. 6 is a top view of FIG. 5;
in the figure, 1, a pile cap body; 1-1, assembling holes; 2. section steel; 3. a pile foundation; 3-1, reinforcing steel bars; 4. a hoisting ring; 5. a ferrule; 6. a wood template; 7. a rubber water stop strip.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The pile cap is an indispensable reinforced concrete member for prefabricating, installing and constructing a high-pile wharf structure, plays a role in connecting piles and beams (or plates), and can also adjust the elevation and position deviation of the pile top generated during piling. However, the existing pile cap construction has some defects, such as: the reinforced concrete pile cap construction steps of cast-in-place construction are complicated, the water stop of the template is high, the difficulty is high, the installation precision of the prefabricated pile cap is poor, slurry leakage is easy to occur in node pouring, the requirement on the machining precision of the circular pile cap template is high, and the repeated utilization rate is low. Therefore, the utility model provides a circular section concrete precast pile cap and an installation method which can save templates, improve the construction speed of the pile cap, ensure the construction quality of the pile cap and save the manufacturing cost,
referring to fig. 1 to 6, a circular cross-section concrete precast pile cap and an installation method thereof; comprises a pile cap body 1 which is prefabricated and formed by concrete, wherein the diameter of the cross section of the pile cap body is D1The center of the pile cap body is provided with an assembly hole 1-1, and the assembly hole is of an equal-diameter hole structure; diameter D of the assembly hole2Larger than the outer diameter D of the cross section of the cylindrical pile foundation3Or the diagonal length D of the cross section of the square pile foundation4(ii) a Two parallel section steels 2 are pre-embedded in the lower end part of the pile cap body, and the section steels penetrate through the assembly holes; the top surface of the pile cap body is embedded with lifting rings 4, three lifting rings are arranged, the included angle between each lifting ring and the circle center connecting line is 120 degrees, and the lifting rings are embedded in the pile cap body (D)1-D2) The/2 position; the rings are recessed into the pile cap body, and the tops of the rings are flush with the top surface of the pile cap.
According to the technical scheme, the diameter of the assembly hole is 5-15 cm larger than the outer diameter of the cross section of the cylindrical pile foundation or the diagonal length of the cross section of the square pile foundation, and the steel bar 3-1 at the upper end of the pile foundation 3 is conveniently inserted into the assembly hole of the prefabricated pile cap.
Preferably, in the technical scheme, the section steel is I-shaped steel or C-shaped channel steel, and plays a role of a carrying pole beam to transfer the dead weight of the pile cap to the pile foundation, so that the overwater construction step of arranging a support structure at the upper part of the pile foundation is avoided; the section steel mark is determined by calculation according to stress.
The technical scheme is preferable, and the distance L between the bottom surface of the section steel and the bottom surface of the pile cap150mm or other values required by design, and the integrity of the pile and the pile cap is improved; spacing L of two sections2Is D3/2 (cylindrical pile) or D4And/2 (square pile foundation) to maintain the stability of the pile cap when it is installed on the pile top.
According to the technical scheme, the edge of the lower end part of the pile cap body is provided with the chamfer, so that collision is prevented, and the consumption of concrete is saved.
The utility model discloses still with disclosing an installation method based on above-mentioned circular cross section concrete precast pile cap, its characterized in that: the method comprises the following steps:
s1, manufacturing a concrete precast pile cap with a circular section according to the structure, maintaining for 28 days, and transporting to a high-pile wharf construction site;
s2, pile head processing: adopting a chiseling or lengthening mode to enable the elevation of the pile top to reach the designed elevation and enable the pile top surface to be smooth;
s3, mounting a ferrule: installing a hoop on the pile foundation at the joint of the prefabricated pile cap and the pile foundation, and sticking a rubber water stop strip at the position where the hoop is contacted with the pile; a wood template is arranged on the hoop, and the distance between the top surface of the template and the pile top is L1(ii) a A rubber water stop strip is adhered to the wood template in advance; plugging a gap between the prefabricated pile cap and the pile foundation through a wood template; stopping water by using a rubber water stop strip;
s4, lifting the precast pile cap to a specified height by using lifting equipment, then installing the precast pile cap, and during installation, firstly inserting the external extending ribs on the upper surface of the pile foundation into the assembly holes of the precast pile cap; then the upper end part of the pile foundation is inserted into the assembly hole of the prefabricated pile cap until the upper surface of the pile foundation is abutted against the lower surface of the section steel; when necessary, finely adjusting the elevation and the inclination angle of the top of the prefabricated pile cap in a mortar leveling mode; after the elevation of the top of the pile cap is adjusted to meet the design requirement and the inclination angle of the pile cap meets the standard limit value, removing the hoisting equipment;
s5, after the hoop and the prefabricated pile cap are installed in place, pouring concrete into the assembly hole from the upper end face of the prefabricated sleeve and vibrating the concrete tightly; the strength of the concrete is not lower than that of the concrete of the prefabricated pile cap and meets the design requirements; after the concrete pouring construction is finished, covering a plastic film for water retention, then covering a concrete heat preservation quilt for heat preservation, and removing the hoop, the heat preservation quilt and the plastic film after 28 days of maintenance, namely finishing the connection and installation of the precast pile cap and the pile foundation.
In conclusion, the utility model aims of practice thrift the template, improve pile cap construction speed, guarantee pile cap construction quality, save the cost are reached. Particularly, the utility model has the advantages that:
(1) the pile cap with the circular section is adopted, so that the raw materials can be saved, and the defects of concrete corner drop and the like of the pile cap in the service life can be avoided.
(2) The pile cap is prefabricated in a prefabrication factory, so that construction under severe weather conditions is avoided, and the quality of the pile cap is ensured.
(3) The process of installing the template on water is omitted, the template is saved, the construction speed is increased, and the manufacturing cost is obviously saved.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention, such as the change of the shape steel model, the change of the size of the pile cap, the change of the water stop manner, the change of the concrete mixing ratio, etc., should be included in the protection scope of the present invention.
Claims (5)
1. A concrete prefabricated pile cap with a circular section comprises a pile cap body which is prefabricated and formed by concrete, and is characterized in that the diameter of the section of the pile cap body is D1The center of the pile cap body is provided with an assembly hole, and the assembly hole is of an equal-diameter hole structure; diameter of the assembly holeD2Larger than the outer diameter D of the cross section of the cylindrical pile foundation3Or the diagonal length D of the cross section of the square pile foundation4(ii) a Two pieces of profile steel which are arranged in parallel are pre-embedded in the lower end part of the pile cap body, and the profile steel penetrates through the assembly hole; the top surface of the pile cap body is embedded with three hanging rings, the included angle between each hanging ring and the circle center connecting line is 120 degrees, and the hanging rings are embedded in (D)1-D2) The/2 position; the rings are recessed into the pile cap body, and the tops of the rings are flush with the top surface of the pile cap.
2. The circular-section concrete precast pile cap according to claim 1, wherein when the pile cap is installed on top of the cylindrical pile foundation, the diameter of the assembly hole is 5-15 cm larger than the outer diameter of the cross-section of the cylindrical pile foundation; when the pile cap is installed at the top of the square pile foundation, the diameter of the assembly hole is 5-15 cm larger than the diagonal length of the cross section of the square pile foundation.
3. The circular cross-section concrete precast pile cap according to claim 1, wherein the section steel is an i-steel or a channel steel.
4. The circular cross-section concrete precast pile cap according to claim 1, wherein the distance L between the bottom surface of the section steel and the bottom surface of the pile cap1Is 50 mm; spacing L of two sections2Is D3[ 2 ] or D4/2。
5. The circular cross-section concrete precast pile cap according to claim 1, characterized in that the lower end edge of the pile cap body is provided with a chamfer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921800484.2U CN211228467U (en) | 2019-10-24 | 2019-10-24 | Circular cross section concrete precast pile cap |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921800484.2U CN211228467U (en) | 2019-10-24 | 2019-10-24 | Circular cross section concrete precast pile cap |
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| CN211228467U true CN211228467U (en) | 2020-08-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110644473A (en) * | 2019-10-24 | 2020-01-03 | 天津市交通运输工程质量安全监督总站 | Circular-section concrete prefabricated pile cap and installation method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110644473A (en) * | 2019-10-24 | 2020-01-03 | 天津市交通运输工程质量安全监督总站 | Circular-section concrete prefabricated pile cap and installation method |
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