CN218263840U - Precast pile for increasing positive resistance and reducing negative resistance - Google Patents
Precast pile for increasing positive resistance and reducing negative resistance Download PDFInfo
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- CN218263840U CN218263840U CN202222686436.3U CN202222686436U CN218263840U CN 218263840 U CN218263840 U CN 218263840U CN 202222686436 U CN202222686436 U CN 202222686436U CN 218263840 U CN218263840 U CN 218263840U
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Abstract
A precast pile for increasing positive resistance and reducing negative resistance comprises a first precast pile and a second precast pile; the first precast pile and the second precast pile are connected through a connecting piece, and the second precast pile is arranged at one end close to the ground. The production equipment and the production method of the pile body main body are completely consistent with those of a common precast pile, the field pile sinking construction equipment and the operation method are not changed greatly, the large pile and the small pile can be used together only through simple connecting pieces, and the material strength of the precast pile can be fully exerted.
Description
Technical Field
The utility model belongs to the building field especially relates to precast pile construction technical field.
Background
In the design and construction of a pile foundation, the situation that the pile penetrates through an unconsolidated soil layer or the ground is piled in a large area is often met, in the situation, the settlement of a soil layer above a pile neutral point (a position where the settlement of the pile and soil around the pile is consistent) is larger than that of the pile, and therefore a downward friction force, namely the negative friction resistance of the pile, is generated around the pile. The cross section size of the common precast pile in the whole length range is kept consistent, the periphery of the pile is in direct contact with a soil body, no resistance reduction measure is provided, when the soil layer above a neutral point is settled, the negative friction resistance is very large, and under the condition that the positive resistance of the pile is not increased, the effective bearing capacity of the pile is greatly reduced. Therefore, it is very important to provide a precast pile with increased positive resistance and decreased negative resistance.
Disclosure of Invention
An object of the utility model is to provide an increase positive resistance and reduce precast pile of negative resistance to increase positive resistance and reduce the negative resistance, improve the effective bearing capacity of precast pile.
In order to solve the technical problem, the utility model discloses an increase positive resistance and reduce negative resistance's precast pile's concrete technical scheme as follows:
the utility model provides an increase precast pile of positive resistance reduction negative resistance which characterized in that: comprises a first precast pile and a second precast pile; the first precast pile and the second precast pile are connected through a connecting piece, and the second precast pile is arranged at one end close to the ground.
Further, the joint of the first precast pile and the second precast pile is located at a pile neutral point.
Further, the second precast pile is wrapped with a plastic film.
Furthermore, the plastic film is a double layer, and the total thickness is 0.1-0.3mm.
Further, a steel sleeve is sleeved outside the second precast pile, and the outer diameter of the steel sleeve is smaller than that of the first precast pile.
Further, the outer diameter of the steel sleeve is smaller than the diameter of the first precast pile by 10-20mm.
Further, the wall thickness of the steel sleeve is 6-12mm.
Furthermore, fine medium sand is filled between the plastic film and the steel sleeve, and the average particle size of the fine medium sand is 0.125-0.5 mm.
The technical scheme of the utility model has following advantage:
(1) The utility model discloses a precast pile, the production facility of its pile body main part, production method are unanimous completely with ordinary precast pile, and on-the-spot pile sinking construction equipment, operation method also change little, just can realize big, little stake through simple connecting piece and use in mixture, the material strength of fully playing precast pile.
(2) The utility model discloses a precast pile adopts major diameter stake below the neutral point, can play the effect of similar club-footed pile, and its end resistance and just frictional resistance can all obtain great increase to improve the bearing capacity of stake.
(3) The utility model discloses a precast pile except that the second precast pile who adopts the minor diameter above the neutral point can reduce the burden friction and hinder, and the burden friction of stake has all further been reduced to the plastic film of stake in stake outer winding and the pouring, and such multiple drag reduction measure can reduce the burden friction of stake to almost negligible degree, greatly improves the effective bearing capacity of stake.
Drawings
FIG. 1 is a sectional view of the precast pile after completion of fine sand filling construction;
fig. 2 is a cross-sectional view of the precast pile in use;
the notation in the figure is: 1-first precast pile, 2-second precast pile, 3-connecting piece, 4-plastic film, 5-steel sleeve, 6-medium fine sand, 7-neutral point, 8-end resistance, 9-positive frictional resistance, 10-negative frictional resistance and 11-effective bearing capacity.
Detailed Description
In order to better understand the purpose, structure and function of the present invention, the following description is made in detail with reference to the accompanying drawings for a precast pile with increased positive resistance and decreased negative resistance.
Example 1
As shown in fig. 1, a precast pile for increasing positive resistance and reducing negative resistance comprises a first precast pile 1 and a second precast pile 2. The diameter of first precast pile 1 is greater than second precast pile 2, and first precast pile 1 and second precast pile 2 pass through connecting piece 3 to be connected, and second precast pile 2 sets up the one end near ground after the connection. The connecting piece 3 is in the shape of a trapezoidal cylinder and is respectively connected with the ends of the first precast pile 1 and the second precast pile 2.
The connection of the first precast pile 1 and the second precast pile 2 is located at the pile neutral point 7. The plastic film 4 is wound outside the second precast pile 2, and the plastic film 4 can further reduce the friction coefficient between the pile and the soil body in the area above the neutral point, so that the overall negative friction resistance of the precast pile is reduced.
Example 2
In the embodiment, the soil stabilization precast pile is not easy to collapse when penetrating through the soil layer, the plastic film 4 is double-layer, and the total thickness is 0.1-0.3mm. And medium fine sand 6 is filled between the plastic film 4 and the hole wall, so that the negative frictional resistance is further reduced while the stability of the precast pile and the pile hole is maintained. The average grain diameter of the medium and fine sand 6 is 0.125 to 0.5mm.
Example 3
In this embodiment, the steel sleeve 5 is sleeved outside the second precast pile 2 to prevent hole collapse, the outer diameter of the steel sleeve 5 is smaller than that of the first precast pile 1, and the steel sleeve 5 is convenient to install after the first precast pile 1 is driven into the ground to form a pile hole.
The outer diameter of the steel sleeve 5 is 10-20mm smaller than the diameter of the first precast pile 1.
The wall thickness of the steel sleeve 5 is 6-12mm, and the use strength is guaranteed.
After the precast pile is integrally driven into the ground, medium fine sand 6 is filled between the plastic film 4 and the steel sleeve 5. The steel casing 5 is then pulled out.
As shown in fig. 2, in this embodiment, since the second precast pile 2 with a small diameter is adopted above the neutral point, and two layers of drag reduction materials, namely a plastic film 4 and medium fine sand 6, are arranged between the second precast pile and the soil body, the negative frictional resistance 10 is greatly reduced. The first precast pile 1 below the neutral point 7 is completely under the action of the positive friction force 9 and the end resistance force 8, and the supporting force is provided to the maximum extent, so that the effective bearing capacity 11 of the precast pile is greatly improved.
Example 4
In this embodiment, the soil layer is relatively stable.
A construction process of a precast pile for increasing positive resistance and reducing negative resistance comprises the following steps:
step 1: leveling a field, constructing and paying off, putting a pile machine in place, and driving or pressing a first precast pile 1 into the pile machine;
step 2: connecting a second precast pile 2 which is wound with a plastic film 4 in advance with the first precast pile 1 through a connecting piece 3;
and step 3: continuously driving or pressing the pile into the soil until the designed depth is reached;
and 4, step 4: and (4) pouring dry medium fine sand 6 between the plastic film 4 and the pile hole while implementing the step 3 until the space is filled with the dry medium fine sand, and finishing the pile construction.
Example 5
A construction process of a precast pile for increasing positive resistance and reducing negative resistance comprises the following steps:
step 1: leveling a field, constructing and paying off, putting a pile machine in place, and driving or pressing a first precast pile 1 into the pile machine;
step 2: connecting a second precast pile 2 which is wound with a plastic film 4 in advance with the first precast pile 1 through a connecting piece 3;
and step 3: sleeving a steel sleeve 5 outside the second precast pile 2;
and 4, step 4: continuously driving or pressing the pile and the steel sleeve into the soil until the designed depth is reached;
and 5: pouring medium fine sand 6 between the plastic film 4 and the steel sleeve 5;
step 6: and (5) pulling out the steel sleeve 5 to finish the pile construction.
Examples of the experiments
According to the geological condition of a certain actual engineering filling site, 3 pile types are respectively adopted, and comparison is carried out under the condition that the total pile length is the same:
scheme 1: the diameter of the first precast pile is 600mm, and the diameter of the second precast pile is 400mm; (technical solution of the present invention)
Scheme 2: the whole length adopts a precast pile with the diameter of 600 mm;
scheme 3: the whole length adopts a precast pile with the diameter of 400 mm.
According to the current relevant national standard, the results are as follows through calculation and comparison:
the effective bearing capacity of the single pile is as follows:
scheme 1 is 1.45 fold as compared to scheme 2;
scheme 1 is 3.98 fold higher than scheme 3.
Single pile engineering cost:
scheme 1 is 1.06 times as much as scheme 2;
scheme 1 is 2.18 fold higher than scheme 3.
Effective bearing capacity obtained per unit investment:
scheme 1 is 1.37 times as high as scheme 2;
scheme 1 is 1.83 times as large as scheme 3.
Therefore, under specific geological conditions, the utility model discloses can greatly save engineering pile foundation expense.
It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes or equivalents may be substituted for elements thereof by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application are intended to be covered by the present invention.
Claims (8)
1. The utility model provides an increase precast pile of positive resistance reduction negative resistance which characterized in that: comprises a first precast pile (1) and a second precast pile (2); the first precast pile (1) and the second precast pile (2) are connected through a connecting piece (3), and the second precast pile (2) is arranged at one end close to the ground.
2. A precast pile that increases positive resistance and decreases negative resistance according to claim 1, characterized in that: the joint of the first precast pile (1) and the second precast pile (2) is located at a pile neutral point (7).
3. A precast pile that increases positive resistance and decreases negative resistance according to claim 2, characterized in that: and a plastic film (4) is wound outside the second precast pile (2).
4. A precast pile that increases positive resistance and decreases negative resistance according to claim 3, characterized in that: the plastic film (4) is a double layer, and the total thickness is 0.1-0.3mm.
5. A precast pile that increases positive resistance and decreases negative resistance according to claim 3, characterized in that: a steel sleeve (5) is sleeved outside the second precast pile (2), and the outer diameter of the steel sleeve (5) is smaller than that of the first precast pile (1).
6. A pre-formed pile for increasing positive resistance and decreasing negative resistance as defined in claim 5, wherein: the outer diameter of the steel sleeve (5) is smaller than the diameter of the first precast pile (1) by 10-20mm.
7. A pre-pile with increased positive resistance and decreased negative resistance as claimed in claim 5 or 6, wherein: the wall thickness of the steel sleeve (5) is 6-12mm.
8. A precast pile that increases positive resistance and decreases negative resistance according to claim 7, wherein: and medium fine sand (6) is filled between the plastic film (4) and the steel sleeve (5), and the average particle size of the medium fine sand (6) is 0.125-0.5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222686436.3U CN218263840U (en) | 2022-10-12 | 2022-10-12 | Precast pile for increasing positive resistance and reducing negative resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222686436.3U CN218263840U (en) | 2022-10-12 | 2022-10-12 | Precast pile for increasing positive resistance and reducing negative resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218263840U true CN218263840U (en) | 2023-01-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222686436.3U Active CN218263840U (en) | 2022-10-12 | 2022-10-12 | Precast pile for increasing positive resistance and reducing negative resistance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218263840U (en) |
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2022
- 2022-10-12 CN CN202222686436.3U patent/CN218263840U/en active Active
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