CN205242385U - Stake of prefabricated back slip casting abnormal shape root - Google Patents
Stake of prefabricated back slip casting abnormal shape root Download PDFInfo
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- CN205242385U CN205242385U CN201521068667.1U CN201521068667U CN205242385U CN 205242385 U CN205242385 U CN 205242385U CN 201521068667 U CN201521068667 U CN 201521068667U CN 205242385 U CN205242385 U CN 205242385U
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Abstract
The utility model provides a stake of prefabricated back slip casting abnormal shape root, includes the concrete pile body, the cross section of concrete pile body is heterotypic cross -section, concrete pile body center is equipped with the steel pipe, the length of steel pipe with the length of pile body equals, be equipped with the reinforcing bar around the steel pipe, the reinforcing bar is fixed in the concrete pile body, the reinforcing bar with the steel pipe forms 33 symmetrical formulas jointly and arranges. The root stake is heterotypic cross -section, can increase with the area of contact of the soil body, improved the side friction resistance of root stake, set up the steel pipe at concrete pile body center to through steel pipe slip casting in to the soil body, the soil body around can the consolidation pile end, to a great extent has improved the bearing capacity of stake end, and steel bar arrangement improves the intensity of root stake in the concrete pile body. The utility model discloses the root stake can restrict according to the condition in different places, makes the pile body of different length, is applicable to the ground of the various soil bodys, and the range of application is wide.
Description
Technical field
The utility model relates to building foundation field, particularly relates to the special-shaped root pile of a kind of prefabricated grouting behind shaft or drift lining.
Background technology
Mini pile is little with its construction area area, speed of application is fast, cost is low, can repair or reinforcing etc. existing buildingAdvantage rapidly at home various places be widely used and promote. Since reform and opening-up, China is constantly in ground base enforcement technologyAspect makes new breakthroughs. A lot of new technologies are also arisen at the historic moment in the process of industry development, for example: anchor jacked pile, root pile,Hole formula static pressed pile, grouting and reinforcing method etc., it is rather extensive that these methods are applied aspect existing building ground base enforcement.
Along with the fast development of China's real estate domain, the problem that building self produces is also comed one after another, in real life,Have many buildings with again building and change can be found everywhere of existing issue, to run into such situation, reinforcing is not undoubtedlyA good method making the best of both worlds, it both can be to the reinforcement and strengthening that carries out of existing building, can avoid again existing buildingThe reconstruction of removing brings economical and temporal waste. Since 2008, China is existing exceed 40% building need to safeguard,Reinforce and transformation, meanwhile, along with the raising of China to antidetonation grade, the set up defences related specifications such as standard, requirement, believe this numberWord is surmounted far away.
When existing root pile is reinforced building, need to build at the scene, the root pile intensity of building rear formation is not high, holdsThe power of carrying is inadequate, therefore, is necessary the special-shaped root pile of a kind of better prefabricated grouting behind shaft or drift lining of design, to address the above problem.
Utility model content
The problem existing for prior art, the utility model provides a kind of prefabricated grouting behind shaft or drift lining that improves a side and bearing capacity of pile tip differentType root pile.
To achieve these goals, the utility model adopts following technical scheme:
The special-shaped root pile of a kind of prefabricated grouting behind shaft or drift lining, comprises concrete pile body, and the cross section of described concrete pile body is profiled-cross-section,Described concrete pile body center is provided with steel pipe, and the length of described steel pipe is more than or equal to the length of described pile body, the week of described steel pipeBe arranged with reinforcing bar, described reinforcing bar is fixed on described concrete pile body, and described reinforcing bar and described steel pipe form 3*3 symmetrical expression row jointlyRow.
Further, described profiled-cross-section is concavo-convex undulations, has the recess setting to the concave and the protuberance being outwards convexly equipped with, described inRecess and described protuberance are all curved, and the forming a circle of space.
Further, the top of described concrete pile body is provided with steel plate, for adjacent described root pile welding, the corresponding institute of described steel plateStating the position of steel pipe offers porose.
Further, the bottom of described concrete pile body is also provided with described steel plate.
Further, the bottom of described steel pipe is provided with grouting gun head, and described grouting gun head stretches out described concrete pile body, described slip castingRifle head is provided with multiple injected holes around.
Further, described injected hole outside is provided with non-return valve.
Further, described reinforcing bar, described steel pipe and the moulding of described concrete pile body one-time-concreting.
Further, the diameter of described root pile is Φ 200mm～Φ 350mm.
The beneficial effects of the utility model:
Root pile is profiled-cross-section, can increase and the contact area of the soil body, has improved the side friction of stake, at concrete pile bodyCenter arranges steel pipe, and by steel pipe to native internal injection, can consolidation pile end the soil body around, improved the bearing capacity of stake end,Reinforcing bar is arranged in concrete pile body, improves the intensity of stake. The utility model root pile can be according to the condition restriction in different places,Make the pile body of different length, be applicable to the ground of the various soil bodys, applied range.
Brief description of the drawings
Fig. 1 is the sectional view of the special-shaped root pile of the prefabricated grouting behind shaft or drift lining of the utility model;
Fig. 2 is the cutaway view of the special-shaped root pile of the prefabricated grouting behind shaft or drift lining of the utility model with the first segment stake of grouting gun head;
Fig. 3 is the cutaway view that in the special-shaped root pile of the prefabricated grouting behind shaft or drift lining of the utility model, two ends arrange the second section stake of steel plate;
In figure, 1-concrete pile body, 11-recess, 12-protuberance, 2-reinforcing bar, 3-steel pipe, 4-grouting gun head, 5-steelPlate.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the utility model embodiment, to the technical scheme in the utility model embodiment carry out clear,Intactly describe, obviously, described embodiment is only a part of embodiment of the present utility model, instead of whole enforcementExample. Based on the embodiment in the utility model, those of ordinary skill in the art obtain not making under creative work prerequisiteEvery other embodiment, all belong to the scope of the utility model protection.
Need explanation, in the utility model embodiment, all directionality are indicated (such as up, down, left, right, before and after ...)Only relative position relation, the motion conditions etc. between the lower each parts of a certain particular pose (as shown in drawings) for explanation, asWhen this particular pose of fruit changes, directionality instruction also correspondingly changes thereupon.
First, concrete precast pile vertical ultimate bearing capacity of single pile standard value formula in technical code for building pile foundation is analyzed asUnder:
Quk＝Qsk+Qpk＝μ∑qsikli+αpskAp
In formula: Qsk---total limit collateral resistance standard value;
Qpk---total extreme end resistance standard value;
μ---pile body length;
qsik---with the limit collateral resistance of all i layer soil of stake of static cone penetration resistance value estimation;
li---the thickness of all i layer soil of stake;
α---modification factor of pile tip resistance, refers to specification;
psk---near the static sounding specific penetration resistance standard value (mean value) stake end;
Ap---stake end area.
Known according to above-mentioned formula, the main and pile side resistance of the size of vertical bearing capacity of single pile and end resistance are closely bound up, thereforeIn the situation that keeping original numerical value constant, improve any one numerical value, all can improve vertical bearing capacity of single pile.
Based on above-mentioned theory basis, the utility model provides a kind of prefabricated grouting behind shaft or drift lining special-shaped root pile, by changing the cross section shape of stakeFormula, has increased the contact area between stake side and the soil body, and then improves the side friction of stake. Meanwhile, after burying, pile top reachesWhen designed elevation, push up the reserved steel pipe in center by stake and pump into water under high pressure mud or other slurries, consolidation pile end week to stake end placeEnclose the soil body in certain limit, thereby improve the bearing capacity of stake end.
As Fig. 1 to Fig. 3, the special-shaped root pile of prefabricated grouting behind shaft or drift lining comprises concrete pile body 1, and the cross section of concrete pile body 1 is differentType cross section, profiled-cross-section is concavo-convex undulations, has the recess 11 setting to the concave and the protuberance 12 being outwards convexly equipped with, recess 11All curved with protuberance 12, and the forming a circle of space, make concrete-pile tool 1 have profiled-cross-section, change the cross section of stakeForm, has increased the contact area between stake side and the soil body, and then improves the side friction of stake side, and with circular cross-section solid pileCompare, saved 10%～15% concrete amount, reduced the cost of manufacture of stake.
Concrete pile body 1 center is provided with steel pipe 3, and the length of steel pipe 3 is more than or equal to the length of pile body 1, and steel pipe 3 aroundBe provided with reinforcing bar 2, reinforcing bar 2 has 8, and reinforcing bar 2 is arranged with the common 3*3 of formation symmetrical expression of steel pipe 3, and employing reinforcing bar 2 canIncrease the intensity of root pile, and reinforcing bar 2 and steel pipe 3 symmetrical expressions arrangements, can carry uniformly strength. Reinforcing bar 2, steel pipe 3With concrete-pile 1 body one-time-concreting moulding, concrete is 8 reinforcing bars 2 and steel pipe 3 by stirrup and wiring colligation after, aroundProp up good template, adopt the moulding of high-strength concrete one-time-concreting.
As Fig. 2 and Fig. 3, the top of concrete pile body 1 is provided with steel plate 5, for adjacent root pile welding, the corresponding steel pipe of steel plate 53 position is offered porose. The utility model root pile is divided into two kinds, and wherein a kind of is first segment stake with grouting gun head 4,With the second section stake without grouting gun head 4. The top of first segment stake is provided with steel plate 5, and its bottom is passed for steel pipe 3, steel pipe 3Length is greater than the length of concrete pile body 1, and the bottom of steel pipe 3 is provided with grouting gun head 4 and stretches out concrete pile body 1, grouting gun head 4Become pointed, the surrounding of grouting gun head 4 is provided with multiple injected holes, and mud injects from the top of steel pipe 3, in injected hole, flow out,With soil solidifying, the outside of injected hole is provided with non-return valve, and non-return valve adopts rubber to make, and non-return valve can prevent piling processThe middle soil body enters in grouting gun head 4. Second section stake is to be equipped with steel plate 5 on the top of concrete pile body 1 and bottom, forAdjacent root pile welding, now the length of steel pipe 3 and concrete pile body 1 is equal in length. First segment stake is installed in foundation soilThe least significant end of body, second section stake is positioned at the top of first segment stake.
The construction method that adopts the special-shaped root pile of above-mentioned prefabricated grouting behind shaft or drift lining to reinforce is as follows:
Step 1: piling. After pile-forming machine perching, play the first segment stake of suspender belt grouting gun head 4, as shown in Figure 2, grouting gun head 4After most advanced and sophisticated aligned position, stake machine enters first segment stake static pressure in foundation soil body, in the time that stake top is depressed into apart from ground 0.5m～1.0mStop piling;
Step 2: pile extension. Before pile extension, the steel plate 5 use wire brushes of upper and lower stake end are removed to floating rust and dirt, will not be with grouting gun head4 second section stake, as shown in Figure 3, after aiming at, welds by steel plate with first segment stake, then second section stake is pressed intoIn ground, in the time that second section stake is depressed into apart from ground 0.5m～1.0m, stop piling, carry out successively the pile extension operation of next joint stake.Enter supporting course or reach after designed elevation until stake end, stake machine can off-load.
Step 3: slip casting. After pile extension completes, by the steel pipe 3 at Zhuan Ding center, from up to down continuous high-pressure injected water mud,Cement mortar flows downward and is flowed out by injected hole from steel pipe 3, with soil solidifying, has improved to a great extent the bearing capacity of stake end.Slip casting reaches after design grouting pressure and grouting amount, i.e. slip casting from bottom to top, to design height, stops slip casting, extracts Grouting Pipe,Slip casting finishes. So far, just complete formation of the special-shaped root pile of prefabricated grouting behind shaft or drift lining.
By changing section form and the grouting behind shaft or drift lining means of stake, can improve significantly pile side resistance and end resistance, and thenEffectively improve vertical bearing capacity of single pile. The special-shaped root pile of the prefabricated grouting behind shaft or drift lining of the utility model can be according to difference in work progressThe condition restriction in place, makes the pile body of different length type, and the diameter of the utility model root pile is Φ 200mm～Φ 350mm,Good effect is brought into play in existing building foundation stabilization aspect, be applicable to sand, silt, mud, muck soil, cohesive soil,The ground in the soils such as artificial earth fill, applied range. And adopt grouting behind shaft or drift lining means that cement mortar is flowed out and the soil body from steel pipe 3 bottomsFixed, improve to a great extent the bearing capacity that stake is held.
Above embodiment is only unrestricted in order to the technical solution of the utility model to be described, although with reference to preferred embodiment to this practicalityNovel having been described in detail, it will be appreciated by those skilled in the art that can modify to the technical solution of the utility model orPerson is equal to replacement, and does not depart from aim and the scope of the technical program, and it all should be encompassed in claim scope of the present utility modelIn.
Claims (8)
1. the special-shaped root pile of prefabricated grouting behind shaft or drift lining, is characterized in that, comprising: concrete pile body, the horizontal stroke of described concrete pile bodyCross section is profiled-cross-section, and described concrete pile body center is provided with steel pipe, and the length of described steel pipe is more than or equal to the length of described pile bodyDegree, the surrounding of described steel pipe is provided with reinforcing bar, and described reinforcing bar is fixed on described concrete pile body, and described reinforcing bar and described steel pipe are commonForming 3*3 symmetrical expression arranges.
2. the special-shaped root pile of prefabricated grouting behind shaft or drift lining according to claim 1, is characterized in that: described profiled-cross-section is concavo-convex fluctuatingShape, has the recess setting to the concave and the protuberance being outwards convexly equipped with, and described recess and described protuberance are all curved, and spaceForm a circle.
3. the special-shaped root pile of prefabricated grouting behind shaft or drift lining according to claim 1, is characterized in that: establish on the top of described concrete pile bodyHave steel plate, for adjacent described root pile welding, the position of the corresponding described steel pipe of described steel plate is offered porose.
4. the special-shaped root pile of prefabricated grouting behind shaft or drift lining according to claim 3, is characterized in that: the bottom of described concrete pile body alsoBe provided with described steel plate.
5. the special-shaped root pile of prefabricated grouting behind shaft or drift lining according to claim 3, is characterized in that: the bottom of described steel pipe is provided with slip castingRifle head, described grouting gun head stretches out described concrete pile body, and described grouting gun head is provided with multiple injected holes around.
6. the special-shaped root pile of prefabricated grouting behind shaft or drift lining according to claim 5, is characterized in that: described injected hole outside is provided with contraryOnly valve.
7. the special-shaped root pile of prefabricated grouting behind shaft or drift lining according to claim 1, is characterized in that: described reinforcing bar, described steel pipe and instituteState the moulding of concrete pile body one-time-concreting.
8. the special-shaped root pile of prefabricated grouting behind shaft or drift lining according to claim 1, is characterized in that: the diameter of described root pile isΦ200mm～Φ350mm。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521068667.1U CN205242385U (en) | 2015-12-17 | 2015-12-17 | Stake of prefabricated back slip casting abnormal shape root |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521068667.1U CN205242385U (en) | 2015-12-17 | 2015-12-17 | Stake of prefabricated back slip casting abnormal shape root |
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| Publication Number | Publication Date |
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| CN205242385U true CN205242385U (en) | 2016-05-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201521068667.1U Active CN205242385U (en) | 2015-12-17 | 2015-12-17 | Stake of prefabricated back slip casting abnormal shape root |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105401571A (en) * | 2015-12-17 | 2016-03-16 | 中冶沈勘工程技术有限公司 | Precast post-grouting special-shaped root pile and construction method thereof |
| CN112095588A (en) * | 2020-09-22 | 2020-12-18 | 上海市基础工程集团有限公司 | Section steel or steel pipe cast-in-situ bored pile and construction method thereof |
-
2015
- 2015-12-17 CN CN201521068667.1U patent/CN205242385U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105401571A (en) * | 2015-12-17 | 2016-03-16 | 中冶沈勘工程技术有限公司 | Precast post-grouting special-shaped root pile and construction method thereof |
| CN112095588A (en) * | 2020-09-22 | 2020-12-18 | 上海市基础工程集团有限公司 | Section steel or steel pipe cast-in-situ bored pile and construction method thereof |
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