CN114319338A - Pile head capable of preventing pile bottom from sinking slag and cast-in-place pile construction method - Google Patents
Pile head capable of preventing pile bottom from sinking slag and cast-in-place pile construction method Download PDFInfo
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- CN114319338A CN114319338A CN202210034710.0A CN202210034710A CN114319338A CN 114319338 A CN114319338 A CN 114319338A CN 202210034710 A CN202210034710 A CN 202210034710A CN 114319338 A CN114319338 A CN 114319338A
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- 238000010276 construction Methods 0.000 title claims abstract description 24
- 239000002893 slag Substances 0.000 title claims description 8
- 239000013049 sediment Substances 0.000 claims abstract description 50
- 230000002787 reinforcement Effects 0.000 claims abstract description 18
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 17
- 239000010959 steel Substances 0.000 claims abstract description 17
- 238000005553 drilling Methods 0.000 claims description 13
- 238000004140 cleaning Methods 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 230000001681 protective effect Effects 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 2
- 238000009417 prefabrication Methods 0.000 claims description 2
- 238000003825 pressing Methods 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims 1
- 239000000725 suspension Substances 0.000 claims 1
- 238000004804 winding Methods 0.000 claims 1
- 239000002689 soil Substances 0.000 abstract description 13
- 230000002411 adverse Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 5
- 238000009434 installation Methods 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 5
- 230000003014 reinforcing effect Effects 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Abstract
The utility model provides a prevent sediment pile head at bottom of stake, includes cylindrical pile head body the up end of pile head body be equipped with a plurality of connecting strips and be used for inserting crisscross each other with the steel reinforcement cage, the lower terminal surface is equipped with a plurality of embedding archs and is used for inserting stereoplasm soil layer through the sediment the pile head body under the terminal surface be equipped with a plurality of filling holes and be used for letting the sediment squeeze into the sediment thickness that makes between the lower terminal surface of pile head body reduce. The cast-in-place pile has the advantages that the pile head is arranged at the bottom of the cast-in-place pile, so that the adverse effect of the sediment on the pile body is effectively eliminated, and the safety performance of the cast-in-place pile is improved. The pile head has simple and reasonable structure, low cost as a prefabricated part and convenient installation and construction.
Description
Technical Field
The invention relates to the technical field of cast-in-place pile construction, in particular to a pile head capable of preventing pile bottom sediment and a cast-in-place pile construction method.
Background
In the construction process of the cast-in-place pile, the slurry wall protection is needed because the hole is easy to collapse after the soft soil is excavated and unloaded. After hole excavation is finished and before concrete is poured, a sediment cleaning process is often needed to avoid that soft soil mud or mud skin is sunk into the bottom of a hole, so that sediment at the bottom of a pile is avoided. The existing clearing technology can not completely clear sediments, so that pile positions with excessive thickness of partial sediments are often found by quality detection of pile foundations of the same batch. The specification GB50202-2018 stipulates that the thickness of end bearing pile sediment is less than or equal to 50mm and the thickness of friction pile sediment is less than or equal to 150mm during construction, and the sediment is allowed to exist in a reasonable range theoretically. The existing sediment cleaning technology has certain uncertainty, which causes great threat to the engineering quality. When sediment thickness exceeded standard requirement, just pour the pile foundation if not clear up, will lead to the fact the pile foundation to sink absolutely, influence the safety of upper portion building. In the prior art, secondary hole cleaning and hole checking are carried out after underwater concrete is poured, but the working difficulty is high, and the site construction is not facilitated.
Disclosure of Invention
The invention provides a pile head capable of preventing pile bottom sediment, aiming at eliminating the adverse effect of the hole bottom sediment on the structure of a pile body.
The second purpose of the invention is to provide a construction method for treating sediment of a cast-in-place pile, which aims at reducing the requirement of clearing holes and avoiding secondary hole clearing during the construction of the cast-in-place pile, solving the adverse effect of sediment on the cast-in-place pile and solving the problem of the adverse effect of sediment on the cast-in-place pile.
The invention is realized by the following technical scheme:
the utility model provides a prevent sediment pile head at bottom of stake, includes cylindrical pile head body the up end of pile head body be equipped with a plurality of connecting strips and be used for inserting crisscross each other with the steel reinforcement cage, the terminal surface supports the stereoplasm special layer for plane accessible sediment down, lower terminal surface is equipped with a plurality of embedding archs and is used for inserting soft soil layer through the sediment the pile head body down the terminal surface be equipped with a plurality of filling holes and be used for letting the sediment squeeze in make the sediment thickness between the lower terminal surface of pile head body reduce.
As the improvement of above-mentioned scheme, still include interior cage, interior cage form through the reinforcing bar coiling, pile head body parcel in cage, a plurality of reinforcing bars of interior cage stretch out from the up end of pile head body and form the connecting strip, its extension length is no less than 20cm in order to guarantee to have good connection performance between pile head and the pile body after inserting each other and pouring concrete with the steel reinforcement cage.
As an improvement of the scheme, the number of the connecting strips is not less than 30.
As the improvement of the scheme, the embedded protrusion is columnar, and the end far away from the pile head body is provided with the conical part, so that the insertion of a hard soil layer is facilitated, and the stability of the pile head is improved.
As an improvement of the scheme, the filling hole is a through hole and penetrates through the upper end face and the lower end face of the pile head body, the volume of the filling hole is increased, and meanwhile, the phenomenon that sediments are not easy to extrude due to the air pressure problem is avoided.
As an improvement of the scheme, the upper end face of the pile head body is provided with a hanging ring, so that the pile head can be hung above the pile hole during construction.
As an improvement of the scheme, the steel bars of the inner cage frame are deformed steel bars, so that the combination degree of the pile head body and the steel bar cage is improved.
As an improvement of the scheme, the pile head body and the embedded bulges are made of concrete.
A construction method of a cast-in-place pile uses the pile head capable of preventing the sediment at the bottom of the pile, and comprises the following specific steps:
s1, construction preparation, namely determining the specification of a cast-in-place pile, a drilling machine and a drilling tool, determining a pile head capable of preventing the bottom of the pile from sinking slag according to the specification of the cast-in-place pile, and performing prefabrication and molding;
s2, positioning and lofting, performing plane measurement, elevation measurement and pile position measurement, and controlling the deviation within a specified range according to the specification of a pile hole;
s3, installing and positioning a drilling machine, embedding a protective cylinder and drilling;
s4, cleaning hole bottom sediment, measuring and inspecting the pile holes, embedding the pile head which is prefabricated in S1 and is used for preventing the pile bottom sediment into the bulge, hanging the pile head downwards into the pile holes, and applying pressure to the pile head from top to bottom;
s5, placing a reinforcement cage, and pouring underwater concrete.
As an improvement of the scheme, the determination condition for determining the pile head capable of preventing the pile bottom from sinking slag according to the specification of the cast-in-place pile is that the outer diameter of the pile head body is the same as that of the cast-in-place pile, and errors in a reasonable range are allowed.
The invention has the following beneficial effects:
1. the pile head is arranged at the bottom of the cast-in-place pile, so that the adverse effect of the sediment on the pile body is effectively eliminated, and the safety performance of the cast-in-place pile is improved. The pile head has simple and reasonable structure, low cost as a prefabricated part and convenient installation and construction.
2. The pile head provided by the invention is arranged during the construction of the cast-in-place pile, so that the requirements on cleaning and detecting sediment can be reduced, the engineering quality is improved, and the working efficiency is improved.
Drawings
Fig. 1 is a perspective view of a pile head for preventing pile bottom from sinking slag in embodiment 1.
Fig. 2 is a perspective view of the pile head for preventing the pile bottom from sinking slag in embodiment 2.
FIG. 3 is another perspective view of the pile head for preventing sinking of the pile bottom in embodiment 2
Fig. 4 is a schematic view of a pile head construction state in a cast-in-place pile construction method according to embodiment 3.
The reference numbers indicate that the pile head body 1, the inner cage 2, the connecting strip 3, the embedding bulge 4, the filling hole 5, the conical part 6, the sediment 7 and the hard soil layer 8.
Detailed Description
Example 1
As shown in fig. 1, a prevent sediment stake head at bottom of stake, including cylindrical stake head body 1, interior cage 2 (part is not shown), stake head body 1 be cylindric, the diameter ratio design stake footpath is slightly littleer the up end of stake head body 1 be equipped with a plurality of connecting strips 3 and be used for inserting crisscross each other with the steel reinforcement cage, the lower terminal surface is used for supporting hard soil layer through the sediment for the plane 1 lower terminal surface of stake head body be equipped with a plurality of filling holes 5 and be used for letting the sediment squeeze in make the sediment thickness between the lower terminal surface of stake head body 1 reduce. The filling hole 5 is a through hole and penetrates through the upper end face and the lower end face of the pile head body 1, so that the volume of the filling hole 5 is increased.
Example 2
As shown in fig. 2 and 3, a pile head for preventing pile bottom sediment is different from embodiment 1 in that a plurality of embedded protrusions 4 are arranged on the lower end surface of the pile head body 1 for inserting soft soil layers through sediment, and a plurality of filling holes 5 are arranged on the lower end surface of the pile head body 1 for enabling the sediment to be squeezed into the pile head body 1 so as to reduce the sediment thickness between the lower end surfaces of the pile head body 1. The filling hole 5 is a through hole and penetrates through the upper end face and the lower end face of the pile head body 1, so that the volume of the filling hole 5 is increased. Interior cage 2 form through the reinforcing bar coiling, pile head body 1 parcel in cage 2, a plurality of reinforcing bars of interior cage 2 stretch out from the up end of pile head body 1 and form connecting strip 3, its extension length is 30mm in order to guarantee to have good connectivity between pile head and the pile body behind inserting each other and the concreting with the steel reinforcement cage. The number of the connecting strips 3 is 30. The embedding protrusion 4 is cylindrical and is provided with a conical part 6 at one end far away from the pile head body 1, so that the insertion of a hard soil layer is facilitated, and the stability of the pile head is improved. Pile head body 1 up end be equipped with rings (not shown) and hang into pile head from pile hole top during convenient construction, the reinforcing bar of interior cage 2 improve the degree of combining of pile head body 1 and steel reinforcement cage for the screw-thread steel. The pile head body 1 and the embedded bulge 4 are made of concrete.
Example 3
As shown in fig. 4, a cast-in-place pile construction method using the pile head for preventing the sediment at the bottom of the pile described in embodiment 1 includes the following specific steps:
s1, construction preparation, namely confirming geology, if the pile head of the embodiment 1 is selected for a hard soil layer, if the pile head of the embodiment 2 is selected for a soft geology, determining that the outer diameter of a cast-in-place pile is 800mm, a drilling machine and a drilling tool, and determining that the outer diameter of a pile head body 1 of the pile head of the pile bottom sediment prevention pile head is 800mm according to the outer diameter of the cast-in-place pile, wherein errors in a reasonable range are allowed.
S2, positioning and lofting, and carrying out plane measurement, elevation measurement and pile position measurement pile position allowable deviation: the diameter is less than 1000mm, and the allowable deviation is 70+0.1 Hmm; the diameter is more than or equal to 1000mm, and the allowable deviation is 100+0.1 Hmm.
S3, installing and positioning a drilling machine, and leveling a field to reach a construction condition; selecting proper mechanical equipment according to the design file; and (5) entering a mechanical device, placing in place according to a planned area, and assembling and overhauling the large-scale device. Embedding a pile casing in advance, wherein the pile casing is accurately, stably and vertically embedded, soil is tamped at the periphery, and the deviation between the center line of the pile casing and the center of a pile position is not more than 30 mm; the top surface of the pile casing is higher than the construction water level or the underground water level by 2m and is higher than the construction ground by 0.5 m; the top surface tolerance of the protective cylinder which is set in place in a sinking way is 50mm, the verticality tolerance is 1%, and during drilling, the hole forming verticality is ensured, and the tolerance is 1%; before drilling, preparing slurry according to design and standard requirements.
S4, cleaning sediment at the bottom of the hole and measuring and checking the pile hole, wherein the sediment cleaning requirement can be equal to or float within an allowable value, and the hole depth is not less than a design value; if rock embedding is needed, the depth is not less than the design value; the perpendicularity deviation is less than or equal to 1 percent, the pile head embedding bulge 4 which is prefabricated for preventing the pile bottom sediment at S1 is hung downwards into the pile hole, pressure is applied to the pile head from top to bottom, sediment 7 at the bottom of the pile hole enters the filling hole 5 due to the extrusion of the pile head, a solid soft soil layer is formed, and the embedding bulge 4 is inserted into the soft soil layer 8 through the sediment.
S5, placing a reinforcement cage, wherein when the reinforcement cage is carried and hoisted, protective measures are needed to be made to avoid deformation of the reinforcement cage. The transportation adopts the flatbed to transport to the job site, hangs the steel reinforcement cage in the hole with the loop wheel machine. The crane operation is directed by a specially-assigned person, two hoisting points are arranged, and the crane needs to be lightly hoisted and lightly placed in the hoisting process. And after the reinforcement cage is completely hoisted, slowly moving the reinforcement cage to the corresponding pile hole. In the steel reinforcement cage hoist and mount income need be downthehole with steel reinforcement skeleton center and stake hole centering back insert, transfer the in-process and will keep the steel reinforcement cage perpendicular, must not touch stake downthehole wall. Due to the existence of the pile head, the working process of secondary hole cleaning and hole checking is omitted, and the working efficiency is improved. And (5) lowering the guide pipe, wherein the joints are tightly connected when the guide pipe is installed. And a sealing ring is arranged at the joint of each joint to prevent the guide pipe from leaking air and water, pouring underwater concrete and pulling out the guide pipe.
The above detailed description is specific to possible embodiments of the present invention, and the embodiments are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the scope of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The pile head capable of preventing pile bottom sediment is characterized by comprising a columnar pile head body, wherein the upper end face of the pile head body is provided with a plurality of connecting strips, the lower end face of the pile head body is a plane, and the lower end face of the pile head body is provided with a plurality of filling holes.
2. The pile head of claim 1, further comprising an inner cage, wherein the inner cage is formed by winding steel bars, the pile head body covers the inner cage, and a plurality of steel bars of the inner cage extend from the upper end face of the pile head body to form the connecting bar, and the length of the connecting bar is not less than 20 cm.
3. The pile head of claim 1, wherein a plurality of protrusions are formed on the lower end surface of the pile head body.
4. The pile head of claim 3, wherein the insert projection is cylindrical and has a tapered portion at an end distal from the pile head body.
5. The pile head of claim 1, wherein the filling hole is a through hole penetrating the upper and lower end faces of the pile head body.
6. The pile head of claim 1, wherein a suspension ring is provided on the upper end of the pile head body.
7. The pile head of claim 2, wherein the reinforcement of the inner cage is a thread steel.
8. The pile head of any one of claims 1 to 7, wherein the pile head body and the embedded protrusions are made of concrete.
9. A method for constructing a cast-in-place pile, which is characterized in that the method uses the pile head capable of preventing the pile bottom from sinking slag as claimed in any one of claims 1 to 8, and comprises the following steps:
s1, construction preparation, namely determining the specification of a cast-in-place pile, a drilling machine and a drilling tool, determining a pile head capable of preventing the bottom of the pile from sinking slag according to the specification of the cast-in-place pile, and performing prefabrication and molding;
s2, positioning and lofting, performing plane measurement, elevation measurement and pile position measurement, and controlling the deviation within a specified range according to the specification of a pile hole;
s3, installing and positioning a drilling machine, embedding a protective cylinder and drilling;
s4, cleaning hole bottom sediment, measuring and inspecting the pile holes, embedding the pile head which is prefabricated in S1 and is used for preventing the pile bottom sediment into the bulge, hanging the pile head downwards into the pile holes, and applying pressure to the pile head from top to bottom;
s5, placing a reinforcement cage, and pouring underwater concrete.
10. The method according to claim 9, wherein the determination condition for determining the pile head for preventing the bottom of the pile from sinking is that the outer diameter of the pile head body is the same as the outer diameter of the cast-in-place pile.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210034710.0A CN114319338A (en) | 2022-01-12 | 2022-01-12 | Pile head capable of preventing pile bottom from sinking slag and cast-in-place pile construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210034710.0A CN114319338A (en) | 2022-01-12 | 2022-01-12 | Pile head capable of preventing pile bottom from sinking slag and cast-in-place pile construction method |
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| CN114319338A true CN114319338A (en) | 2022-04-12 |
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| CN202210034710.0A Pending CN114319338A (en) | 2022-01-12 | 2022-01-12 | Pile head capable of preventing pile bottom from sinking slag and cast-in-place pile construction method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2828143Y (en) * | 2005-06-15 | 2006-10-18 | 吴金水 | Pile shoe special for tubular pile |
| CN204456090U (en) * | 2015-02-09 | 2015-07-08 | 上海三凯建设管理咨询有限公司 | A kind of static pressure pipe pile |
| CN210315506U (en) * | 2019-06-13 | 2020-04-14 | 浙江广屿建设有限公司 | Prefabricated PHC tubular pile |
| CN112554177A (en) * | 2021-02-22 | 2021-03-26 | 中铁九局集团第四工程有限公司 | Construction method of ultra-long small-diameter cast-in-situ bored pile |
| CN214460337U (en) * | 2021-03-30 | 2021-10-22 | 广东腾都建设基础有限公司 | Static pressure pipe pile |
-
2022
- 2022-01-12 CN CN202210034710.0A patent/CN114319338A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2828143Y (en) * | 2005-06-15 | 2006-10-18 | 吴金水 | Pile shoe special for tubular pile |
| CN204456090U (en) * | 2015-02-09 | 2015-07-08 | 上海三凯建设管理咨询有限公司 | A kind of static pressure pipe pile |
| CN210315506U (en) * | 2019-06-13 | 2020-04-14 | 浙江广屿建设有限公司 | Prefabricated PHC tubular pile |
| CN112554177A (en) * | 2021-02-22 | 2021-03-26 | 中铁九局集团第四工程有限公司 | Construction method of ultra-long small-diameter cast-in-situ bored pile |
| CN214460337U (en) * | 2021-03-30 | 2021-10-22 | 广东腾都建设基础有限公司 | Static pressure pipe pile |
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