CN112921962A - Pile foundation reinforcing method - Google Patents
Pile foundation reinforcing method Download PDFInfo
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- CN112921962A CN112921962A CN202110098168.0A CN202110098168A CN112921962A CN 112921962 A CN112921962 A CN 112921962A CN 202110098168 A CN202110098168 A CN 202110098168A CN 112921962 A CN112921962 A CN 112921962A
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- pile
- reinforcing
- foundation
- pile cap
- foundation pit
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/64—Repairing piles
Abstract
The application relates to a pile foundation reinforcing method which comprises the following steps of S1, excavating a foundation pit, excavating to form the foundation pit, wherein the pit bottom of the foundation pit is lower than the lower surface of a pile cap, and a construction space is formed between the pit bottom of the foundation pit and the lower surface of the pile cap. S2, constructing a reinforcing structure, S2-1, constructing a reinforcing pile, and constructing the reinforcing pile at the bottom of the foundation pit and at one side of the vertical projection of the pile cap at the bottom of the foundation pit. And S2-2, constructing a reinforcing plate, constructing on the lower surface of the pile cap to form the reinforcing plate, and fixedly connecting the reinforcing plate with the reinforcing pile. And S3, backfilling the foundation pit, S3-1, filling the first filler layer, and filling the first filler between the lower surface of the reinforcing plate and the bottom of the foundation pit to form the first filler layer. And S3-2, filling the second filler layer, filling the side wall of the first filler layer to form the second filler layer, and vibrating and sealing the second filler layer from the upper surface of the second filler layer, wherein the upper surface of the second filler layer is higher than the lower surface of the reinforcing plate. This application has the effect to the damage of pile cap when reducing the pile foundation and consolidating.
Description
Technical Field
The application relates to the technical field of foundation reinforcement, in particular to a pile foundation reinforcement method.
Background
At present, a pile foundation structure is a short name for a deep foundation consisting of piles and pile bearing platforms connected with pile tops.
In industrial plants, there may occur an independent foundation designed and constructed separately at the bottom end of the equipment due to the excessive mass of the equipment. But when the factory building has changed and has compared the bigger new installation of former equipment quality, for the bearing capacity of the independent basis of guarantee, can consolidate the pile foundation usually.
After the equipment is disassembled, referring to fig. 1, the existing pile foundation reinforcement method is as follows: step one, excavating a foundation pit 3. And excavating to form a foundation pit 3, wherein the bottom of the foundation pit 3 is lower than the upper surface of the pile cap 1, and excavating the pile cap 1.
And step two, positioning the opening. And (3) setting out the position of the reinforcing pile 5 on the pile cap 1 according to the design, and then forming a vertical through hole on the pile cap 1. And the wall of the through hole is implanted with a plurality of tie bars which are arranged around the axis of the through hole.
And step three, constructing the reinforcing pile 5. And forming a pile hole of the reinforcing pile 5 by adopting a method of drilling a cast-in-place pile, then hoisting a reinforcement cage, and welding and fixing the tie bars and the reinforcement cage to form a whole. And finally, pouring concrete to form the reinforcing pile 5.
In view of the above-mentioned related technologies, the inventor believes that the integrity of the pile cap will be damaged by the method of first forming a through hole in the pile cap and then planting a rib on the wall of the through hole, which will reduce the bearing capacity of the pile cap and is disadvantageous for reinforcing the pile foundation.
Disclosure of Invention
In order to reduce the damage to a pile cap when a pile foundation is reinforced, the application provides a pile foundation reinforcing method.
The application provides a pile foundation reinforcement method, adopts following technical scheme:
s1, excavating the foundation pit, and excavating to form the foundation pit, wherein the pit bottom of the foundation pit is lower than the lower surface of the pile cap, and a construction space formed by a gap is formed between the pit bottom of the foundation pit and the lower surface of the pile cap;
s2, constructing a reinforcing structure, S2-1, constructing a reinforcing pile, constructing at the bottom of the foundation pit and at one side of the vertical projection of the pile cap at the bottom of the foundation pit to form the reinforcing pile, wherein the top end of the reinforcing pile is higher than the bottom of the foundation pit;
and S2-2, constructing a reinforcing plate, constructing the lower surface of the pile cap to form the reinforcing plate, and fixedly connecting the lower surface of the reinforcing plate to the reinforcing pile.
S3, backfilling the foundation pit, S3-1, filling a first filler layer, filling the first filler layer between the lower surface of the reinforcing plate and the bottom of the foundation pit to form the first filler layer, and vibrating and sealing the first filler layer on the side wall of the first filler layer;
and S3-2, filling a second filler layer, filling a second filler material on the side wall of the first filler layer to form the second filler layer, and vibrating and sealing the second filler layer from the upper surface of the second filler layer, wherein the upper surface of the second filler layer is higher than the lower surface of the reinforcing plate.
Through adopting above-mentioned technical scheme, form the construction space that supplies the activity of on-the-spot personnel to operate under the pile foundation to constructor construction gusset plate when increase pile cap thickness, makes the load on the pile cap pass through gusset plate and transmits for the reinforcement stake, thereby reduces to add the reinforcement stake under the circumstances of original pile cap destruction, thereby improves the holistic bearing capacity of pile foundation. And the first packing layer is filled between the gusset plate and the bottom of the foundation pit, and the second packing layer is filled between the side wall of the first packing layer and the wall of the foundation pit, so that the supporting strength between the gusset plate and the wall of the foundation pit is improved, and the settlement of the reinforced pile foundation is reduced.
Optionally, in step S1, a support pillar is disposed on the lower surface of the pile cap, the top end of the support pillar abuts against the lower surface of the pile cap, and the bottom end of the support pillar abuts against the bottom of the foundation pit.
Through adopting above-mentioned technical scheme, the support column can support between pile cap and the foundation ditch pit bottom to reduce because the foundation ditch excavation leads to the lower surface of pile cap to come to nothing and the settlement volume that produces.
Optionally, in step S2-2, a plurality of support ribs are implanted into the outer side wall of the original pile in a rib-implanting manner, and one end of each support rib, which is away from the original pile, extends into the reinforcing plate.
Through adopting above-mentioned technical scheme, the brace rod can improve the connection performance between original post and the gusset plate to improve the connection performance of gusset plate and pile foundation.
Optionally, the edge of the upper surface of the reinforcing plate is fixedly connected with a reinforcing part, the top end of the reinforcing part is higher than the lower surface of the pile cap, and the corresponding reinforcing piles of the reinforcing plate are arranged.
Through adopting above-mentioned technical scheme, the upper surface is higher than the rib of pile cap lower surface, can increase the thickness size at reinforcing plate edge, reduces the reinforcing plate and leads to the marginal cracked probability that appears of reinforcing plate because the load transmits for the reinforcing pile to improve the connection stability ability of reinforcing pile and reinforcing plate, the guarantee is to the reinforcement effect of pile foundation.
Optionally, the rib sets up around the upper surface edge a week of gusset plate, one side that the rib is close to pile cap is provided with the splice bar, the splice bar has a plurality of roots around pile cap a week interval distribution, splice bar one end fixed connection is in the pile cap, the other end that the splice bar is relative stretches into in to the rib and with rib fixed connection.
Through adopting above-mentioned technical scheme, the splice bar can improve the connection performance of rib and pile cap to improve the vertical connection performance of gusset plate and pile cap.
Optionally, the one side that the rib is close to the pile cap forms the holding tank with the upper surface middle part of gusset plate, the pile cap inlays and locates in the holding tank, the lateral wall of pile cap and the cell wall fixed connection of holding tank.
Through adopting above-mentioned technical scheme, the holding tank that the rib formed can also carry out the restraint on the level to the pile cap to improve the connection stability ability of pile cap and gusset plate.
Optionally, the gusset plate includes the reinforcing bar net piece of parallel pile cap and the concrete layer of parcel reinforcing bar net piece, the reinforcing bar net piece includes horizontal muscle and indulges the muscle, the horizontal muscle of reinforcing bar net piece or indulge muscle fixed connection in the upper surface of brace rod.
Through adopting above-mentioned technical scheme, when horizontal muscle and indulge the muscle ligature and form the reinforcing bar net piece, the support muscle that is located on original stake can also provide the support for horizontal muscle or indulge the muscle, reduces horizontal muscle and indulges the muscle and receive the action of gravity and bending deformation when the ligature. The concrete layer and the reinforcing mesh form a reinforced concrete structure with better strength, rigidity and stability.
Optionally, in step S1, the bottom of the foundation pit is tamped, and then the supporting pillars are formed by building blocks.
By adopting the technical scheme, the foundation pit bottom is tamped to provide a solid supporting surface for the supporting column. Adopt the building block to build and form the support column, compare in concrete placement formation support column, adopt the building block can form vertical support for pile cap excessively fast. And compared with the support column made of metal, the support column formed by building the building blocks can avoid the support column from being rusted.
Optionally, in step S3-2, the second filler is gravel with a particle size of 20-50 mm, and the gravel is compacted and compacted after being spread for 20-30 cm.
By adopting the technical scheme, the second filler layer can be layered and paved, and then the compactness of the second filler layer can be improved by vibration compaction, so that the stability of the first filler layer between the second filler layers is reduced.
Optionally, in step S3-2, after the second packing layer is constructed, a coagulant is poured from the upper surface of the second packing layer.
By adopting the technical scheme, the coagulant is cement paste, the coagulant is poured on the second filler layer, and the coagulant can enter the position of the first filler along the space between the second fillers, so that the coagulant can improve the bonding performance between the second fillers and the connection performance between the first filler layer and the second filler layer.
In summary, the present application includes at least one of the following beneficial technical effects:
1. through the reinforcing plate, the thickness of the pile cap is increased, meanwhile, the load transmitted by the pile cap can be transmitted to the reinforcing pile, and the reinforcing pile is additionally arranged under the condition that the original pile cap is damaged, so that the integral bearing capacity of the pile foundation is improved;
2. when the transverse bars and the longitudinal bars are bound to form a reinforcing mesh, the supporting bars on the original pile can also provide support for the transverse bars or the longitudinal bars, so that the bending deformation of the transverse bars and the longitudinal bars under the action of gravity during binding is reduced;
3. through layering paving, the second filler of vibration density for the second filler layer is closely knit, thereby improves the constraint performance to first filler layer.
Drawings
Fig. 1 is a schematic view of the overall structure of a reinforcing structure in the background art.
Fig. 2 is a schematic view of the overall structure of the reinforcing structure according to the embodiment of the present application.
Fig. 3 is an enlarged schematic view of the reinforcing part of fig. 2.
Description of reference numerals: 1. a pile cap; 2. original pile; 3. a foundation pit; 4. a support pillar; 5. reinforcing piles; 6. a reinforcing plate; 7. supporting ribs; 8. reinforcing mesh sheets; 9. reinforcing the mesh sheet; 10. a reinforcing part; 11. connecting ribs; 12. a first filler layer; 13. a second packing layer; 14. and (5) stretching the ribs.
Detailed Description
The present application is described in further detail below with reference to figures 2-3.
Demolish the equipment in will original factory building, then carry out the reinforcement of pile foundation, refer to fig. 2, the pile foundation includes pile cap 1 and is used for supporting original stake 2 of pile cap 1.
The embodiment of the application discloses a pile foundation reinforcing method. Referring to fig. 2 and 3, the method for reinforcing the foundation pit 3 includes the following steps: and S1, excavating the foundation pit 3, excavating on the ground corresponding to the independent foundation, wherein the bottom of the excavated foundation pit 3 is lower than the lower surface of the pile cap 1, a construction space formed by a gap is formed between the bottom of the foundation pit 3 and the pile cap 1, and the height interval of the construction space is larger than 120 cm. The construction space is convenient for field personnel to move and operate at the bottom of the foundation pit 3.
The excavation of foundation ditch 3 is accomplished, carries out the tamping process to the bottom of the hole of foundation ditch 3, if 3 soil property of foundation ditch is soft soil layer when, can pour a layer plain concrete bed course at the bottom of the hole of foundation ditch 3. In the embodiment of the application, the bottom of the foundation pit 3 can be used after being tamped.
And then building blocks on the bottom of the foundation pit 3 to form a support column 4, wherein the top end of the support column 4 is abutted against the lower surface of the pile cap 1. The building blocks are concrete blocks of MU 7.5. The support columns 4 will provide vertical support for the pile cap 1, thereby reducing the settling due to the emptying of the lower surface of the pile cap 1.
And S2, reinforcing the structure construction. And S2-1, constructing a reinforcing pile 5. The construction forms reinforcing pile 5 on the bottom of foundation ditch 3 pot holes, and reinforcing pile 5 is provided with a plurality of around the pile foundation in 3 vertical projection a week at the bottom of the foundation ditch 3 pot holes, and the pile bolck of reinforcing pile 5 is higher than 3 pot holes at the bottom of foundation ditch, and reinforcing pile 5 is the bored concrete pile.
S2-2, constructing the reinforcing plate 6. S2-2-1, planting support ribs 7, drilling holes on the outer side wall of the original pile 2 horizontally, injecting a rib planting glue, and then horizontally embedding one end of each support rib 7 into the rib planting glue, so that the support ribs 7 are fixedly connected with the original pile 2. Each original stake 2 all has two support bars 7 along 2 axial interval distributions of original stake, and two support bars 7 are close to pile cap 1 and set up, and every support bar 7 of being listed as has four at least around the axis interval and the equidistance distribution of original stake 2.
And S2-2-2, binding the steel bars in the reinforcing plate 6. The reinforcing bar includes that two are parallel to each other and the reinforcement net piece 9 at 8 marginal reinforcement net pieces 9 that are located higher one deck reinforcing bar net piece 8 that the height set up, reinforcing bar net piece 8 parallel pile cap 1 in gusset plate 6. Reinforcing bar net piece 8 all includes horizontal muscle and indulges the muscle, and reinforcing bar net piece 8's horizontal muscle or indulge the axial middle part butt of muscle at the upper surface of brace rod 7, and reinforcing bar net piece 8 indulges the muscle butt and adopt welded fastening on brace rod 7 in this application embodiment. The lower surface of the layer of reinforcing mesh 8 at the lower position is abutted against the top end of the reinforcing pile 5. The edges of the two reinforcing mesh sheets 8 are fixedly connected with each other through a reinforcing mesh sheet 9.
A plurality of connecting ribs 11 are arranged on the periphery of the side wall of the pile cap 1 at intervals and equidistantly in a penetrating mode, one end of each connecting rib 11 is fixedly connected to the pile cap 1, and the other end, opposite to the connecting rib 11, of each connecting rib is cantilevered.
The top end of the reinforcing mesh 9 is higher than the lower surface of the pile cap 1, and the reinforcing mesh 9 comprises bent ribs and lap ribs. The bent ribs are distributed at intervals around the two reinforcing mesh sheets 8 at equal intervals, and two ends of the bent ribs are respectively bound and fixed with the edges of the two reinforcing mesh sheets 8. The middle part of the bent rib in the length direction is upwards protruded after the bent rib is bent for four times, and one side of the bent rib, which is close to the pile cap 1, is fixedly connected to the connecting rib 11. The lap joint ribs are distributed at intervals along the length direction of the bent ribs.
And then, weaving the template, wherein the upper surface of the template is lower than the bottom end of the reinforcing pile 5, and the size of the distance between the upper surface of the template and the top end of the reinforcing pile 5 is not less than 5 cm.
S2-2-3, pouring concrete for the reinforcing plate 6, and pouring concrete for wrapping the two reinforcing mesh sheets 8 and the reinforcing mesh sheet 9 on the template.
After the concrete is hardened, the concrete, the two reinforcing mesh sheets 8 and the reinforcing mesh sheet 9 form a reinforcing plate 6, and the thickness of the middle part of the reinforcing plate 6 is 20 cm.
And after the concrete is hardened, removing the template. Be formed with the rib along a week reinforcing upper surface, the rib is close to one side of pile cap 1 and forms the holding tank, and the groove lateral wall of holding tank and the lateral wall of pile cap 1 laminate each other and fixed connection, and 11 one end of splice bar stretches into to the rib in from the pile cap this moment. The holding tank forms the level spacing to pile cap 1 to the rib can form mutual vertical spacing through splice bar 11 and pile cap 1, thereby has improved gusset plate 6 and pile cap 1's overall connection performance.
And S3, backfilling the foundation pit 3. S3-1, constructing a first filler layer 12. Paving a first filler between the pile cap 1 and the bottom of the foundation pit 3 to form a first filler layer 12, wherein the first filler is a rock block with the particle size of 50-70 mm, and the edge of the first filler layer 12 is subjected to slope releasing treatment. After the first filler is filled, the peripheral side wall of the first filler layer 12 is firstly vibrated and compacted by adopting a vibrating rod insertion type, and then the outer side wall of the first filler layer 12 is vibrated and compacted by adopting a flat plate vibrator.
S3-2, constructing a second filler layer 13. And filling a second filler material on the side wall of the first filler material layer 12 to form a second filler material layer 13, wherein the upper surface of the second filler material layer 13 is higher than the lower surface of the pile cap 1.
The second filler is gravel with the particle size of 20-50 mm, and is paved in a layered mode and compacted in a layered mode. The paving thickness of each layer is 20-30 cm, and a flat plate vibrator is adopted for vibration compaction.
After the paving of the second packing layer 13 is completed, a coagulant is poured into the second packing layer 13 until the coagulant liquid level is higher than the upper surface of the reinforcing plate 6. The coagulant is cement paste.
The cement paste fills the gap between the first filler and the second filler, thereby improving the strength and the adhesive property of the first filler layer 12 and the second filler layer 13.
S3-3, covering soil and backfilling. A layer of soil is spread on the second packing layer 13.
The implementation principle of the pile foundation reinforcing method in the embodiment of the application is as follows: add at the lower surface of pile cap 1 and establish gusset plate 6, give reinforcing pile 5 through gusset plate 6 with vertical load transfer, compare in the direct reinforcing pile 5 of being under construction on pile cap 1, reduced the step of vertical open-ended on pile cap 1 to the integrality of pile cap 1 has been ensured.
The reinforcing part pair on the reinforcing plate 6 is positioned on the reinforcing pile 5, so that the strength of the edge position of the reinforcing plate 6 is improved, and the stability of the reinforcing plate 6 is guaranteed.
The supporting columns 4 formed by building blocks after the foundation pit 3 is excavated can improve the stability of the pile cap 1 during the reinforcing construction and reduce the settlement of the pile cap 1.
The first filler layer 12 on the reinforcing plate 6 has higher filling strength than soil layer filling, and is more environment-friendly and economical than concrete pouring and backfilling.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. A pile foundation reinforcing method is characterized in that: s1, excavating a foundation pit (3) to form the foundation pit (3), wherein the pit bottom of the foundation pit (3) is lower than the lower surface of the pile cap (1), and a construction space formed by a gap is formed between the pit bottom of the foundation pit (3) and the lower surface of the pile cap (1);
s2, constructing a reinforcing structure, S2-1, constructing a reinforcing pile (5), constructing at the bottom of the foundation pit (3) and at one side of the vertical projection of the pile cap (1) at the bottom of the foundation pit (3) to form the reinforcing pile (5), wherein the top end of the reinforcing pile (5) is higher than the bottom of the foundation pit (3);
s2-2, constructing a reinforcing plate (6), constructing the lower surface of the pile cap (1) to form the reinforcing plate (6), and fixedly connecting the lower surface of the reinforcing plate (6) to a reinforcing pile (5);
s3, backfilling the foundation pit (3), S3-1, filling the first filler layer (12), filling the first filler between the lower surface of the reinforcing plate (6) and the bottom of the foundation pit (3) to form the first filler layer (12), and vibrating and sealing the first filler layer (12) on the side wall of the first filler layer (12);
s3-2, filling a second filler layer (13), filling a second filler material on the side wall of the first filler layer (12) to form the second filler layer (13), and vibrating and sealing the second filler layer (13) from the upper surface of the second filler layer (13), wherein the upper surface of the second filler layer (13) is higher than the lower surface of the reinforcing plate (6).
2. The pile foundation reinforcing method according to claim 1, wherein: in step S1, a support pillar (4) is disposed on the lower surface of the pile cap (1), the top end of the support pillar (4) abuts against the lower surface of the pile cap (1), and the bottom end of the support pillar (4) abuts against the bottom of the foundation pit (3).
3. The pile foundation reinforcing method according to claim 1, wherein: in step S2-2, a plurality of support ribs (7) are implanted on the outer side wall of the original pile (2) in a rib-implanting manner, and one end of each support rib (7) departing from the original pile (2) extends into the reinforcing plate (6).
4. The pile foundation reinforcing method according to claim 1, wherein: the edge of the upper surface of the reinforcing plate (6) is fixedly connected with a reinforcing part, the top end of the reinforcing part is higher than the lower surface of the pile cap (1), and the corresponding reinforcing piles (5) of the reinforcing plate (6) are arranged.
5. The pile foundation reinforcing method according to claim 4, wherein: the utility model discloses a pile cap, including reinforcing plate (6), rib (11), pile cap (1), splice bar (11) one side that reinforcing plate (6) is around last surface edge a week setting, one side that reinforcing plate is close to pile cap (1) is provided with splice bar (11), splice bar (11) a week interval distribution has a plurality of roots around pile cap (1), splice bar (11) one end fixed connection is in pile cap (1), the other end that splice bar (11) is relative stretches into in the reinforcing plate and with reinforcing plate fixed connection.
6. The pile foundation reinforcing method according to claim 4, wherein: one side that the rib is close to pile cap (1) forms the holding tank with the upper surface middle part of gusset plate (6), pile cap (1) inlays and locates in the holding tank, the lateral wall of pile cap (1) and the cell wall fixed connection of holding tank.
7. The pile foundation reinforcing method according to claim 1, wherein: the reinforcing plate (6) comprises a steel bar mesh (8) of the parallel pile cap (1) and a concrete layer wrapping the steel bar mesh (8), the steel bar mesh (8) comprises transverse bars and longitudinal bars, and the transverse bars or the longitudinal bars of the steel bar mesh (8) are fixedly connected to the upper surface of the supporting bars (7).
8. The pile foundation reinforcing method according to claim 2, wherein: in step S1, the bottom of the foundation pit (3) is tamped, and then the support column (4) is formed by building blocks.
9. The pile foundation reinforcing method according to claim 1, wherein: in step S3-2, the second filler is gravel with a particle size of 20-50 mm, and the gravel is vibrated to be dense and compacted after being spread for 20-30 cm.
10. The pile foundation reinforcing method according to claim 1, wherein: in step S3-2, after the second packing material layer 13 is constructed, a coagulant is poured from the upper surface of the second packing material layer 13.
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| CN202110098168.0A CN112921962A (en) | 2021-01-25 | 2021-01-25 | Pile foundation reinforcing method |
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| CN202110098168.0A CN112921962A (en) | 2021-01-25 | 2021-01-25 | Pile foundation reinforcing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113373936A (en) * | 2021-06-10 | 2021-09-10 | 浙江鹏盛建设集团有限公司 | Assembly type structure and construction method thereof |
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Application publication date: 20210608 |