CN117738486A - Reinforcing method of high-rise building structure layer-added pile foundation - Google Patents
Reinforcing method of high-rise building structure layer-added pile foundation Download PDFInfo
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- CN117738486A CN117738486A CN202311651501.1A CN202311651501A CN117738486A CN 117738486 A CN117738486 A CN 117738486A CN 202311651501 A CN202311651501 A CN 202311651501A CN 117738486 A CN117738486 A CN 117738486A
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- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 115
- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000008093 supporting effect Effects 0.000 claims abstract description 66
- 230000002787 reinforcement Effects 0.000 claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- 230000005484 gravity Effects 0.000 claims description 4
- 210000001503 joint Anatomy 0.000 claims description 2
- 238000005553 drilling Methods 0.000 claims 1
- 238000009435 building construction Methods 0.000 abstract description 2
- 238000010276 construction Methods 0.000 description 13
- 230000000694 effects Effects 0.000 description 12
- 238000005728 strengthening Methods 0.000 description 7
- 238000005266 casting Methods 0.000 description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
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Abstract
The application relates to the technical field of building construction, in particular to a reinforcing method of a high-rise building structure layer-added pile foundation. The reinforcing method of the high-rise building structure layer pile foundation comprises the following steps: pressure relief of basement water pressure; piling; applying reinforcing piles on the ground; the top of the reinforcing pile is higher than the ground; supporting; a supporting structure is erected between the pile foundation and the reinforcing pile; the support structure includes a support beam; the top of the reinforcing pile is connected with the pile foundation through a supporting beam; pressurizing; the load of the pile foundation is transmitted to the reinforcing pile through the supporting beam, so that the reinforcing pile is pressurized; laying a foundation slab; the foundation slab adopts raft, and reinforcing piles and raft form a pile-raft foundation. The reinforcement pile and the support beam are used for reinforcing the existing pile foundation of the building, so that the stability of the existing pile foundation of the building can be effectively improved, the integrity of the building foundation can be effectively improved by adopting a newly-built raft foundation mode, the strength is high, and the building foundation has good waterproof and moistureproof performances.
Description
Technical Field
The application relates to the technical field of building construction, in particular to a reinforcing method of a high-rise building structure layer-added pile foundation.
Background
At present, before the storey-adding construction of a building, pile foundations of the building are required to be reinforced so as to improve the bearing capacity of the pile foundations, thereby meeting the requirement of the stability of the building.
In the common reinforcement technology, the pile is most commonly pressed by adopting an anchor rod static pressure pile, namely, the pile is pressed by adopting counter force provided by an anchor rod anchored in the original foundation, and the pile is generally a small-section pile. The machine tool is simple and easy to operate.
However, since the pile to be driven is a pile with a small cross section, the pile to be driven has a limited bearing capacity, and it is difficult to satisfy pile foundation reinforcement requirements for high-rise buildings.
Disclosure of Invention
The application provides a reinforcement method of high-rise building structure layer pile foundation, can provide sufficient bearing capacity to the pile foundation of building to do not have the influence to the waterproof nature of basis, adopt following technical scheme:
a reinforcement method of a layer-added pile foundation of a high-rise building structure comprises the following steps:
pressure relief of basement water pressure; the original foundation slab of the building is provided with a hole, a dewatering well is constructed, and the water level of the basement is lowered below the foundation slab;
piling; applying reinforcing piles on the ground; the top of the reinforcing pile is higher than the ground;
supporting; a supporting structure is erected between the pile foundation and the reinforcing pile;
the support structure includes a support beam; the top of the reinforcing pile is connected with the pile foundation through a supporting beam;
pressurizing; the load of the pile foundation is transmitted to the reinforcing pile through the supporting beam, so that the reinforcing pile is pressurized;
laying a foundation slab; the foundation slab adopts raft, the reinforcing piles and the raft form a pile-raft foundation.
By adopting the technical scheme, the basement water pressure is relieved by opening holes in the original foundation slab of the building, so that the pressurized water can be effectively controlled, and a dry working environment can be created in advance.
Adopt to consolidate stake and supporting beam to the current pile foundation of building, can promote the stability of the current pile foundation of building effectively to consolidate the stake and also can directly play the supporting role to the building, thereby further promote the steadiness of building. The method of chiseling the original foundation slab and newly building the raft foundation is adopted, so that the integrity of the building foundation can be effectively improved, the strength is high, and the building foundation has good waterproof and moistureproof performances. The weight of the building can be acted on the reinforcing piles through the pressurizing step, so that the supporting effect of the reinforcing piles on the building can be improved.
Preferably, the reinforcing piles are arranged in a plurality and uniformly distributed on two opposite sides of the pile foundation; the pile foundation comprises a pile cap; the supporting beam passes through the pile cap, and two ends of the supporting beam are respectively connected with two reinforcing piles positioned on two opposite sides of the pile foundation.
Through adopting above-mentioned technical scheme, adopt a supporting beam to carry out the bearing to the pile cap of pile foundation to make a supporting beam be connected with the reinforcement stake, thereby make the reinforcement stake provide holding power to the pile foundation, in order to realize the purpose of pile foundation reinforcement.
Preferably, the reinforcement piles are arranged between two adjacent pile foundations of the building; and the two ends of the supporting beam are respectively connected with two pile foundations, and the central position of the supporting beam is connected with the reinforcing piles.
Through adopting above-mentioned technical scheme, consolidate the stake and also can set up between two pile foundations of building for consolidate the stake and consolidate two pile foundations simultaneously, both realized the reinforcement effect, also can practice thrift construction cycle, and help practicing thrift construction cost.
Preferably, the top of the reinforcement pile is provided with a pressurizing oil cylinder; and the cylinder body and the output end of the pressurizing cylinder are respectively connected with the top end of the reinforcing pile and the supporting beam.
Through adopting above-mentioned technical scheme, the pressurized cylinder is when the jacking, and the reaction force of building is through pressurized cylinder effect to strengthening on the stake to make strengthening the stake can be more stable, and make strengthening the stake and can directly share the weight of building, thereby promote the reinforcement effect.
Preferably, the supporting beam is a steel beam; the steel beam is provided with a support column, the support column vertically penetrates through the steel beam, and the bottom of the support column is in butt joint with the reinforcing pile;
in the pressurizing process, the support column and the reinforcing pile keep an abutting relationship under the action of self gravity; and after the pressurization is finished, welding the support column and the support beam.
Through adopting above-mentioned technical scheme, when the pressurization, because the self weight effect of building is to the reinforcement stake on, the reinforcement stake can slightly sag, and the support column can follow the reinforcement stake and move down under self gravity effect this moment, keeps the butt relation with the reinforcement stake. After pressurization is completed, the support column and the support beam are welded, and when the pressurizing oil cylinder is disassembled, the weight of the building can be transferred to the reinforcing pile through the support beam and the support column.
Preferably, the reinforcement pile adopts a bored pile, and a pile casing is arranged before the reinforcement pile is applied; the support column and the support beam are welded with the pile casing.
Through adopting above-mentioned technical scheme, the bored concrete pile has the advantage that intensity is high, construction technique is ripe, and the setting of a pile casing is convenient for the smooth construction of bored concrete pile on the one hand, but also can consolidate bored concrete pile, further promotes the intensity and the bearing capacity of reinforcing pile to promote the reinforcement effect to building pile foundation.
Preferably, the support beam is a concrete beam; the pressurizing oil cylinders are provided with a plurality of groups and are distributed on two sides of the reinforcing piles; the pressurizing oil cylinder is connected with the reinforcing pile through a connecting frame;
after pressurization is completed, a pouring template is arranged between the reinforcing piles and the supporting beams, and supporting columns are poured in the pouring template to realize connection of the reinforcing piles and the supporting beams.
Through adopting above-mentioned technical scheme, after the pressurization technique, can realize the connection between reinforcing pile and the supporting beam through the mode of pouring concrete between reinforcing pile and supporting beam, can effectively guarantee that the weight of building can be through supporting beam transfer to consolidate to guarantee to consolidate the effect of bearing of pile to the building.
Preferably, the drill holes are filled with pre-buried anchor rods; the supporting beam is connected with the anchor rod.
Through adopting above-mentioned technical scheme, the setting of pre-buried stock can realize supporting beam and the connection of strengthening the stake, helps promoting the wholeness of supporting beam and strengthening the stake, promotes the stability of two to promote supporting beam and strengthening the stake and to pile foundation and building self supporting effect, improve supporting beam and strengthening the load performance of stake.
Preferably, when the raft reinforcing steel bars are paved, the raft reinforcing steel bars are connected with the supporting beams; and when the raft is poured, pouring the supporting beam into the raft.
Through adopting above-mentioned technical scheme, make raft and supporting beam interconnect, supporting beam can effectively strengthen the intensity of raft to promote the load performance of raft, realize the reinforcement to the building. The reinforcing piles and the raft plates form a pile-raft foundation, and the stability of the building can be effectively improved. Therefore, the reinforcement effect on the building can be greatly enhanced by the mutual combination of the raft, the support beams and the reinforcement piles.
In summary, the present invention includes at least one of the following beneficial technical effects:
1. adopt to consolidate stake and supporting beam to the current pile foundation of building, can promote the stability of the current pile foundation of building effectively to consolidate the stake and also can directly play the supporting role to the building, thereby further promote the steadiness of building. The method of chiseling the original foundation slab and newly building a raft foundation is adopted, so that the integrity of the building foundation can be effectively improved, the strength is high, and the building foundation has good waterproof and moistureproof performances;
2. the pressurizing oil cylinder is adopted, so that the weight of the building acts on the reinforcing pile, the construction strength of the reinforcing pile can be improved, and the reinforcing pile can be conveniently guaranteed to play a good supporting role on the building in the follow-up process; and guarantee the stable connection of reinforcing pile when sinking, supporting beam and reinforcing pile through adopting the mode of movable support column, consequently can still guarantee that the weight of building is steadily passed to the reinforcing pile through supporting beam after the pressurized cylinder demolishs to can effectively reduce the pressurized cylinder and demolish the variation of the reinforcing pile atress around, guarantee the reinforcing pile to the reinforcement effect of pile foundation.
3. The raft and the supporting beam are connected with each other, so that the supporting beam can effectively strengthen the strength of the raft, thereby improving the load performance of the raft and improving the reinforcement effect on the building; the reinforcing piles and the raft plates form a pile-raft foundation, and the stability of the building can be effectively improved. Therefore, the reinforcement effect on the building can be greatly enhanced by the mutual combination of the raft, the support beams and the reinforcement piles.
Drawings
FIG. 1 is a schematic view of one structural form of reinforcing piles, support beams and pile foundations according to embodiment 1 of the present application;
FIG. 2 is a schematic view of another structural form of reinforcing piles, supporting beams and pile foundations according to embodiment 1 of the present application;
FIG. 3 is an enlarged schematic view of a portion A of FIG. 1;
fig. 4 is a schematic structural view of reinforcing piles, supporting beams and pile foundations in example 2 of the present application.
The reference numerals in the drawings: 1. foundation piles; 2. pile cap; 3. reinforcing piles; 4. a support structure; 41. a support beam; 42. a force bearing member; 5. a pressurizing oil cylinder; 6. a force bearing plate; 61. a sleeve; 62. a substrate.
Detailed Description
The invention is described in further detail below with reference to fig. 1-4.
Example 1
The embodiment of the application discloses a reinforcement method of a high-rise building structure layer-adding pile foundation, which is mainly used for layer-adding reinforcement, deviation correction reinforcement and the like of the existing building. And is mainly applied to buildings with non-raft foundations. Referring to fig. 1, a pile foundation of a building includes a foundation pile 1 and a pile cap 2.
The reinforcing method of the high-rise building structure layer pile foundation comprises the following steps:
s1, pressure relief of basement water pressure.
The original foundation slab of the basement of the building is provided with a hole, a dewatering well is constructed, and the water level of the basement is lowered below the foundation slab.
S2, piling.
The reinforced pile in the embodiment of the application adopts a bored pile. As a preferred embodiment of the present application, a static pile or the like may be used. First, a casing is set on the ground. The pile foundation is used as a reference for the position of the pile casing, and the pile casing is arranged in the range of 3m radius with the pile foundation as the center. In order to improve the efficiency of construction, the pile casing can adopt the mode of vibration sinking to carry out the construction.
The number of the pile casings is set according to the number of the reinforcing piles 3 to be applied.
After the pile casing construction is completed, the top of the pile casing is required to be ensured to be higher than the ground. In the embodiment of the application, in order to ensure the normal operation of subsequent construction, the ground at the top of the pile casing is 30-50cm higher.
The pile casing is taken as a reference, and a reinforcing pile 3 is applied to the ground;
the number of reinforcing piles 3 is set based on the reinforcing requirement of pile foundations. One, two, three or more may be provided. It should be noted that, when it is necessary to reinforce a pile foundation, the number of reinforcing piles 3 is preferably even, for example, two, and two reinforcing piles 3 are symmetrically disposed on both sides of the pile foundation. In other cases, for example, when the entire building foundation is reinforced, the number of reinforcing piles 3 is not limited.
Finally, the top of the reinforced pile 3 is required to be provided with an embedded anchor rod. The pre-buried anchor rod extends upwards to the upper part of the reinforcement pile 3.
S3, supporting.
A support structure 4 is erected between the pile foundation and the reinforcing piles 3. The support structure 4 comprises a support beam 41 and a force bearing member 42. In the embodiment of the present application, in order to improve the construction efficiency and to ensure that the support beam 41 has sufficient strength, the support beam 41 is a steel beam. The load bearing members 42 are provided as steel support columns. The support column is inserted on the support beam 41, and the support column is slidable up and down.
The support beam 41 is provided according to the relative positions of the reinforcing piles 3 and pile foundations. The construction method comprises the following two construction conditions:
referring to fig. 1, the first case is: the reinforcing piles 3 are symmetrically distributed on two sides of the pile foundation. In this case, it is necessary to pass the support beam 41 through the bottom of the pile cap (it is necessary to excavate the soil to the lower side of the pile cap in advance in step S1 and leak out the foundation pile 1), and both ends of the support beam 41 are extended to the upper sides of the two reinforcing piles 3, respectively, so that the bottom ends of the support beams are abutted against the top ends of the reinforcing piles 3.
Referring to fig. 2, in the second case, a reinforcing pile 3 is provided between two pile foundations. In this case, it is necessary to provide both ends of the support beam 41 at the bottoms of the two pile caps 2, respectively, and to provide the middle portion of the support beam 41 above the reinforcing pile 3, and it is also necessary to contact the bottom end of the support beam with the top end of the reinforcing pile 3.
In both cases, if soil cannot be excavated to the bottom of the pile cap 2, the support beam 41 and the pile cap 2 may be connected by means of the planting rib anchoring.
The supporting beam 41 is provided with a jack for the pre-buried anchor rod to pass through.
S4, pressurizing.
Referring to fig. 1 and 3, a pressurizing cylinder 5 is provided on the side of the support beam 41, and an output end of the pressurizing cylinder 5 is in contact with the bottom of the support beam 41. A bearing plate 6 is arranged between the pressurizing oil cylinder 5 and the reinforcing pile 3, the bearing plate 6 comprises a base plate 62 and a sleeve 61 arranged on the base plate 62, the sleeve 61 is sleeved with the top of the reinforcing pile 3, and the base plate 62 extends to one side of the sleeve 61 in the horizontal direction. The cylinder body of the pressurizing cylinder 5 is connected to the base plate 62.
The pressurizing oil cylinder 5 is started, so that downward pressure can be applied to the reinforcing pile 3, and the load of the pile foundation is transferred to the reinforcing pile 3, so that the stability and bearing capacity of the reinforcing pile 3 are improved.
In the pressurizing process, when the reinforcing pile 3 slightly moves downwards, the supporting column and the reinforcing pile 3 are kept in abutting relation under the action of self gravity. After the pressurization is finished, the support column is welded with the support beam 41 so that the support column is fixed on the support beam 41, thereby realizing stable connection of the support beam 41 and the reinforcing pile 3.
At the same time, the support columns and the steel beams can be selectively welded with the pile casing to improve the integrity of the reinforcing piles 3 and the support beams 41.
And finally, the pressurizing oil cylinder 5 is removed, and the bearing plate 6 can be left on the reinforcing pile 3 without being removed.
Nuts are arranged on the parts, above the supporting beams 41, of the embedded screws, and after the nuts are screwed, the supporting beams 41 and the reinforcing piles 3 are connected.
S5, paving a foundation slab.
The foundation slab adopts raft, forms the raft foundation. I.e. firstly paving raft steel bars and then pouring post concrete.
When the raft reinforcing bars are laid, the raft reinforcing bars are connected with the supporting beams 41, and connection modes such as welding, steel wire binding and the like can be adopted. And when concrete is poured, the support beam 41 is poured inside the raft, so that the raft foundation and the support beam 41 are connected with each other. The support beams 41 may effectively enhance the loading performance of the raft. The reinforcing piles 3 and the raft plates form a pile-raft foundation, so that the stability of the building can be effectively improved.
Through the steps, the reinforcing structure can be added at the pile foundation of the building, so that the reinforcing effect on the pile foundation and the building foundation is realized.
Example 2
The embodiment of the application discloses a reinforcement method of a high-rise building structure layer-added pile foundation. The difference from embodiment 1 is that the support beam 41 in the embodiment of the present application is provided as a concrete beam.
The support beams 41 can be connected with the pile cap 2 by concrete pouring.
Referring to fig. 4, the load bearing members 42 are provided as post-cast concrete columns. That is, after the pressurization is completed, a casting form is provided between the reinforcing piles 3 and the support beams 41, and casting is performed in the casting form to achieve connection of the reinforcing piles 3 and the support beams 41.
For the connection of the supporting beam 41 and the embedded screw rod, a nut connection mode can be adopted, and concrete can be injected into the jack in a concrete joint filling mode to realize the connection of the supporting beam 41 and the embedded screw rod. In addition, an adhesive connection may be used.
The embodiments of the present invention are all preferred embodiments of the present invention, and are not intended to limit the scope of the present invention in this way, therefore: all equivalent changes in structure, shape and principle of the invention should be covered in the scope of protection of the invention.
Claims (10)
1. A reinforcement method of a layer-added pile foundation of a high-rise building structure is characterized by comprising the following steps: the method comprises the following steps:
pressure relief of basement water pressure; the original foundation slab of the building is provided with a hole, a dewatering well is constructed, and the water level of the basement is lowered below the foundation slab;
piling; applying reinforcing piles (3) on the ground; the top of the reinforcing pile (3) is higher than the ground;
supporting; a supporting structure (4) is erected between the pile foundation and the reinforcing pile (3);
-the support structure (4) comprises a support beam (41); the top of the reinforcing pile (3) is connected with a pile foundation through a supporting beam (41);
pressurizing; the load of the pile foundation is transferred to the reinforcing pile (3) through the supporting beam (41), so that the reinforcing pile (3) is pressurized;
laying a foundation slab; the foundation slab adopts raft, and the reinforcing piles (3) and the raft form a pile-raft foundation.
2. The method for reinforcing a high-rise building structure added layer pile foundation according to claim 1, wherein: the reinforcing piles (3) are arranged on a plurality of opposite sides of the pile foundation and are uniformly distributed on the opposite sides of the pile foundation; the pile foundation comprises a pile cap (2); the support beam (41) passes through the pile cap (2), and two ends of the support beam (41) are respectively connected with two reinforcing piles (3) positioned on two opposite sides of the pile cap.
3. The method for reinforcing a high-rise building structure added layer pile foundation according to claim 2, wherein: the reinforcing piles (3) are arranged between two adjacent pile foundations of the building; two ends of the supporting beam (41) are respectively connected with two pile foundations, and the central position of the supporting beam (41) is connected with the reinforcing pile (3).
4. A method of reinforcing a high-rise building structure added layer pile foundation according to claim 2 or 3, wherein: the top of the reinforcement pile (3) is provided with a pressurizing oil cylinder (5); the cylinder body and the output end of the pressurizing cylinder (5) are respectively connected with the top end of the reinforcing pile (3) and the supporting beam (41).
5. A method of reinforcing a high-rise building structure added pile foundation according to claim 3, wherein: the supporting beam (41) is configured as a steel beam; the steel beam is provided with a support column, the support column vertically penetrates through the steel beam, and the bottom of the support column is in butt joint with the reinforcing pile (3);
in the pressurizing process, the support column and the reinforcing pile (3) keep an abutting relationship under the action of self gravity; after the pressurization is finished, the support column is welded with the support beam (41).
6. The method for reinforcing a high-rise building structure added layer pile foundation according to claim 5, wherein: the reinforced pile adopts a bored pile, and a pile casing is arranged before the reinforced pile (3) is applied; the support column and the support beam are welded with the pile casing.
7. A method of reinforcing a high-rise building structure added layer pile foundation according to claim 2 or 3, wherein: the support beam (41) is provided as a concrete beam; the pressurizing oil cylinders (5) are provided with a plurality of groups and are distributed on two sides of the reinforcing piles (3); the pressurizing oil cylinder (5) is connected with the reinforcing pile (3) through a connecting frame;
after pressurization is completed, a pouring template is arranged between the reinforcing pile (3) and the supporting beam (41), and a supporting column is poured in the pouring template to realize connection of the reinforcing pile (3) and the supporting beam (41).
8. The method for reinforcing a high-rise building structure added layer pile foundation according to claim 7, wherein: a bearing plate (6) is arranged between the pressurizing oil cylinder (5) and the reinforcing pile (3); the bearing plate (6) comprises a base plate (62) and a sleeve (61) arranged on the base plate (62), and the sleeve (61) is sleeved with the top of the reinforcing pile (3); the base plate (62) extends to one side of the sleeve (61) in the horizontal direction; the pressurizing cylinder (5) is connected with the base plate (62).
9. Therefore, the pressurizing oil cylinder (5) can be prevented from occupying the top of the reinforcing pile (3), thereby ensuring the support column and the reinforcing pile (3)
A method of reinforcing a high-rise building structure added layer pile foundation according to claim 2 or 3, wherein: the drilling holes are filled with pre-buried anchor rods; the supporting beam (41) is connected with the anchor rod.
10. The method for reinforcing a high-rise building structure added layer pile foundation according to claim 1, wherein: when the raft steel bars are paved, the raft steel bars are connected with a supporting beam (41); and when the raft is poured, pouring the supporting beam (41) into the raft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311651501.1A CN117738486A (en) | 2023-12-04 | 2023-12-04 | Reinforcing method of high-rise building structure layer-added pile foundation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311651501.1A CN117738486A (en) | 2023-12-04 | 2023-12-04 | Reinforcing method of high-rise building structure layer-added pile foundation |
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| Publication Number | Publication Date |
|---|---|
| CN117738486A true CN117738486A (en) | 2024-03-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311651501.1A Pending CN117738486A (en) | 2023-12-04 | 2023-12-04 | Reinforcing method of high-rise building structure layer-added pile foundation |
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| Country | Link |
|---|---|
| CN (1) | CN117738486A (en) |
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2023
- 2023-12-04 CN CN202311651501.1A patent/CN117738486A/en active Pending
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