CN112081118A - Pile-anchor supporting foundation pit deepening reinforcing and supporting structure and construction method thereof - Google Patents
Pile-anchor supporting foundation pit deepening reinforcing and supporting structure and construction method thereof Download PDFInfo
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- CN112081118A CN112081118A CN202011045839.9A CN202011045839A CN112081118A CN 112081118 A CN112081118 A CN 112081118A CN 202011045839 A CN202011045839 A CN 202011045839A CN 112081118 A CN112081118 A CN 112081118A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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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
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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
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
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Abstract
The invention relates to a pile-anchor supporting foundation pit deepening reinforcing and supporting structure and a construction method thereof, wherein the reinforcing and supporting structure comprises an original supporting pile (1), a waist beam (3) and an original prestressed anchor cable in an original pile-anchor supporting system, a newly-increased supporting pile (2), a newly-increased prestressed anchor cable (4) and a newly-arranged crown beam (5); the newly-increased supporting piles (2) are arranged among the original supporting piles (1), the newly-increased supporting piles (2) penetrate through the new excavation depth of the whole foundation pit, the top parts of the newly-increased supporting piles are flush with the top parts of the original supporting piles (1), and the newly-increased supporting piles are connected into a whole through newly-arranged crown beams (5) in a pouring mode; the newly added prestressed anchor cables (4) are distributed between the new pile and the old pile, and the outer ends of the newly added prestressed anchor cables are fixed on the wale (3). The invention adopts a reinforcing mode of inserting long supporting piles and prestressed anchor cables between the original supporting piles, and forms a unified whole with the original supporting structure through the connection of the waist beam, the anchor cable and the newly-arranged crown beam, thereby effectively increasing the integral rigidity and the cooperative deformation capability of the enclosure structure and enhancing the bearing capacity of the enclosure structure.
Description
Technical Field
The invention relates to the technical field of foundation pit engineering support reinforcement, in particular to a pile-anchor support foundation pit deepening and reinforcing support structure and a construction method thereof.
Background
With the rapid development of economy and urbanization, the available construction land is less and less, and in order to meet various requirements of life and working space of people, the utilization and development of urban underground space become hot spots concerned by more and more people. The excavation scale and depth of the foundation pit are larger and larger, and the difficulty of foundation pit support and the complex situation of the surrounding environment are increased. When the foundation pit supporting structure is constructed or will be constructed, the foundation pit needs to be deeply excavated on the basis of the original design due to the modification of the design plan, such as the storey-adding design of a basement.
And the internal force value of the foundation pit caused by the deepening excavation of the foundation pit can exceed the internal force value design value of the original foundation pit supporting scheme, so that the original foundation pit supporting design can not meet the supporting strength requirement, and the influence on the overall safety and stability of the foundation pit is great. This makes the existing foundation pit face two options: one method is to give up the existing foundation pit to carry out support design again, and then or carry out design reinforcement on the original support foundation. For a construction unit, the safety and economic benefits of the foundation pit are the main considerations. Obviously, if the existing foundation pit supporting structure is abandoned, a large amount of resources are wasted, the engineering cost is increased, but if the existing foundation pit supporting structure can be utilized for design and reinforcement, meanwhile, reasonable design and transformation are carried out, the manufacturing cost is reduced, and good benefits are necessarily obtained for engineering. Therefore, the design and the reinforcement of the supporting structure are carried out on the original supporting structure, the safety and the stability of the foundation pit in the construction process are ensured, and the method has important value.
In the prior art, the method is mainly a mode of reinforcing the anchor cable layer, namely, aiming at a mode of reinforcing the supporting structure after the whole deepened excavation of the foundation pit supported by the pile anchor in the original supporting mode: after the construction of the support pile and the prestressed anchor cable in the original design is finished, a layer of prestressed anchor cable is added at a proper position. Wherein, traditional stake anchor support system mainly contains: support piles, anchor cables, waist beams, crown beams and the like. Vertically driving a support pile into a soil layer on the side wall of the foundation pit; the crown beam and the support pile are cast together at the pile top; the prestressed anchor cable penetrates through the waist beam and is driven into the soil layer, and the waist beam is arranged along the side wall of the foundation pit, so that the anchor cable, the support pile and the crown beam form a whole body which can deform in a coordinated mode.
Although the anchor cable layer-adding reinforcing mode can make up for the situation that the original supporting system has insufficient load capacity due to insufficient embedded depth of the original supporting pile caused by deepening and excavating the foundation pit to a certain extent, the anchor cable layer-adding reinforcing mode has the following defects:
(1) the anchor cable is additionally arranged to strengthen the connection strength between the pile body of the support pile and the pit wall soil body, the displacement of the pit wall soil body is indirectly limited through the support pile, the overlarge displacement of the embedded end at the bottom of the support pile can be reduced, the problem that the bearing capacity of the support pile is weakened is solved, but the problem that the embedded depth of the original support pile is not enough is not fundamentally solved, and in some working conditions, for example, when the excavation depth is deepened to be larger in a foundation pit and the lateral soil pressure of the foundation pit is larger, the reinforcing method is very easy to lose efficacy, and great potential safety hazards are caused to construction.
Disclosure of Invention
The invention aims to solve the technical problem of providing a pile-anchor supporting foundation pit deepening reinforcing and supporting structure with better reinforcing effect and a construction method thereof, so as to solve the problem of insufficient supporting strength of a pile-anchor supporting system due to foundation pit deepening excavation.
In order to solve the problems, the deepening and reinforcing support structure for the pile-anchor support foundation pit comprises an original support pile in an original pile-anchor support system, a waist beam arranged on the original support pile, an original prestressed anchor cable of which the outer end is fixed on the waist beam, a newly-increased support pile, a newly-increased prestressed anchor cable and a newly-arranged crown beam; the newly-increased supporting piles are arranged among the original supporting piles and are kept on the same plane, the newly-increased supporting piles penetrate through the new excavation depth of the whole foundation pit, the top parts of the newly-increased supporting piles are flush with the top parts of the original supporting piles, and the newly-increased supporting piles are connected into a whole through the newly-arranged crown beams in a pouring mode; the newly increased prestressed anchor cables are distributed between the original supporting piles and the newly increased supporting piles, and the outer ends of the newly increased prestressed anchor cables are fixed on the waist beam.
Preferably, the pile diameter of the newly-increased supporting pile is equal to or larger than that of the original supporting pile.
Preferably, the newly-increased supporting piles are arranged at intervals of one or two or more original supporting piles.
The invention also correspondingly provides a construction method of the pile-anchor supporting foundation pit deepening and reinforcing supporting structure, which comprises the following steps:
breaking an original crown beam in an original pile anchor supporting system, and avoiding breaking main ribs of an original supporting pile as much as possible in the breaking process;
inserting and implementing newly-increased supporting piles according to requirements;
and after all the newly-increased support piles are implemented, completing construction of a newly-increased prestressed anchor cable and pouring of a newly-arranged crown beam, straightening main reinforcements of the original support piles as far as possible in the pouring process, and anchoring and pouring the main reinforcements in the newly-arranged crown beam in a nearby principle.
Compared with the prior art, the invention has the following advantages:
1. the invention adopts a reinforcing mode of inserting long supporting piles and prestressed anchor cables between the original supporting piles, the newly-increased supporting piles penetrate through the excavation depth of the whole foundation pit, and the newly-arranged top beams and the original supporting structure form a unified whole through the connection of the waist beams and the newly-arranged top beams, so that the integral rigidity and the cooperative deformation capability of the enclosure structure can be effectively increased, and the bearing capacity of the enclosure structure is enhanced. The reinforcement form of the invention proves that the foundation pit deformation control effect is better through numerical simulation, field test and monitoring. 2. The invention utilizes the existing foundation pit supporting structure to carry out design reinforcement, carries out reasonable design transformation and construction, reduces the cost of construction and obtains good benefit for engineering.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Fig. 1 is a schematic view of a reinforcing and supporting structure provided in an embodiment of the present invention.
Fig. 2 is a top view of inter-post distribution provided by an embodiment of the present invention.
FIG. 3 is a cross-sectional view illustrating a prestressed anchorage cable according to an embodiment of the present invention.
In the figure: 1-original supporting pile, 2-newly increased supporting pile, 3-waist beam, 4-newly increased prestressed anchor cable and 5-newly arranged crown beam.
Detailed Description
It should be noted that, although the long and short pile supporting system is well known in the prior art, the long and short pile supporting system is a foundation pit supporting method, the invention provides a pile anchor supporting foundation pit deepening and reinforcing supporting structure, which is a foundation pit supporting reinforcing method.
Referring to fig. 1 and 2, an embodiment of the present invention provides a pile-anchor supporting foundation pit deepening and reinforcing supporting structure, which mainly includes an original supporting pile 1 in an original pile-anchor supporting system, a wale 3 arranged on the original supporting pile 1, an original prestressed anchor rope whose outer end is fixed on the wale 3, a newly-increased supporting pile 2, a newly-increased prestressed anchor rope 4, and a newly-arranged crown beam 5.
Newly-increased fender pile 2 lays between former fender pile 1 stake, and both inboard parallel and level just keep at the coplanar, and newly-increased fender pile 2 runs through the new excavation degree of depth of whole foundation ditch, and its top is as an organic whole with the top parallel and level of former fender pile 1 and pour through establishing hat roof beam 5 newly and connect. Wherein, newly-increased fender pile 2 keeps the coplanar with former fender pile 1, can not cause the influence to foundation ditch excavation working face.
The newly-increased prestressed anchor cables 4 are distributed between the original support piles 1 and the newly-increased support piles 2, and the outer ends of the newly-increased prestressed anchor cables are fixed on the wale 3. In practical application, the specific arrangement form, the distance and the number of the prestressed anchor cables and the applied load are determined according to the specific requirements of engineering.
The pile diameter of the newly increased support pile 2 is equal to or larger than that of the original support pile 1. In practical application, the newly-increased support pile 2 can increase the section size according to the design to strengthen the rigidity of the pile body while meeting the enough embedding depth.
The newly increased supporting piles 2 are arranged at intervals of one or two or more original supporting piles 1. In practical application, according to the actual conditions of the foundation pit, the safety and the economic benefit of the foundation pit are comprehensively considered, and different arrangement intervals are selected, for example: the arrangement of one original supporting pile or the arrangement of two original supporting piles can be selected, and the density can be increased appropriately at the weak part of the bearing capacity. Fig. 1 shows the case of "one long supporting pile is added every two original supporting piles".
Based on the reinforced supporting structure disclosed by the embodiment, the embodiment of the invention correspondingly provides a construction method, and the construction method mainly comprises the following steps:
1. and breaking the original crown beam in the original pile anchor supporting system, and avoiding breaking the main rib of the original supporting pile 1 as much as possible in the breaking process.
2. And inserting the newly-increased support piles 2 as required.
3. After all the newly-increased support piles 2 are implemented, the construction of the newly-increased prestressed anchor cables 4 and the pouring of the newly-arranged crown beams 5 are completed, and the main reinforcements of the original support piles 1 are straightened as far as possible in the pouring process and are anchored and poured in the newly-arranged crown beams 5 in the principle of near.
In addition to the above-mentioned points and emphasis, the prior art may be referred to for the construction process of the newly-increased support piles 2 in the step 2, the newly-increased prestressed anchor cables 4 in the step 3 and the newly-installed crown beams 5. However, to facilitate understanding of the present solution by those skilled in the art, detailed implementation is given below.
In the above step 2, reference may be made to the following for implementing the newly grown support pile 2:
firstly, pore-forming process and technical requirements
(1) The hole can be formed by adopting a slurry wall protection machine;
(2) preparation work is fully done before drilling, hole forming construction is finished uninterruptedly at one time, and drilling stopping cannot be caused; the time between hole forming and pouring should not exceed 24 hours;
(3) controlling the drilling speed during hole opening to prevent hole collapse and hole inclination;
(4) the deviation of the pile position is less than or equal to 50mm, the deviation of the verticality is less than 1%, and the thickness of the sediment at the bottom of the pile is less than or equal to 200 mm;
② manufacturing reinforcement cage
(1) The overall dimension of the reinforcement cage is required to meet the design requirement, and the allowable deviation is as follows:
main rib spacing: and the stirrup spacing of +/-10 mm: plus or minus 20mm
Diameter of the steel reinforcement cage: the total length of the steel reinforcement cage is +/-10 mm: plus or minus 100mm
Protecting the reinforcement cage: plus or minus 20mm
(2) The main reinforcement of the reinforcement cage can be connected by lap welding, when the lap welding is adopted, the lap length is welded in a single face mode, the length of a welding line is not less than 10 times of the diameter of the reinforcement, the length of a welding line in the double face welding is not less than 5 times of the diameter of the reinforcement, the reinforcing rib in the reinforcement cage is connected with the main reinforcement in a welding mode, and the stirrup is connected with the main reinforcement by binding or spot welding;
(3) the reinforcement cage is preferably manufactured in whole sections, measures are taken to prevent deformation in hoisting, transportation and installation, an outer hoop or inner hoop reinforcing steel bar is arranged at a hoisting point, welding is adopted for connection of longitudinal bars when the reinforcement cage is placed in sections, special attention is paid to welding quality, the number of joints on the same section is not more than 50%, and the distance between adjacent joints is 35d and is not less than 500 mm; the placing direction of the reinforcement cage is consistent with the design direction.
Thirdly, pouring concrete into pile body
(1) When the drilled pile reaches the designed elevation of the hole bottom, checking and accepting in time, and pouring pile body concrete in time after the checking and accepting are qualified;
(2) the concrete mixing proportion is determined by calculation or trial assembly;
(3) the used material has a quality certificate and can be used after passing the inspection;
(4) when the concrete is mixed, the concrete is strictly measured according to the mixing proportion;
(5) pouring concrete of the pile body by adopting a guide pipe method, wherein the concrete has good workability and fluidity, the slump is generally 180-220 mm, the concrete is poured continuously once, and the compactness is ensured;
(6) the pouring guide pipe is buried in the concrete surface, the guide pipe is strictly prevented from being lifted out of the concrete surface, the dismounting time of the guide pipe is strictly controlled, the concrete pouring is continuously carried out, a vibrator is fixed at the bottom of the guide pipe, the pile body concrete is tamped, and the pile body is vibrated while pouring. When pouring concrete, special personnel should record the buried depth of the guide pipe and the height difference between the inner concrete surface and the outer concrete surface of the guide pipe so as to lift and dismantle the guide pipe in time.
(7) Before the construction of the crown beam, the floating slurry on the pile top is chiseled and cleaned, and the length of the exposed reinforcing steel bar above the pile top meets the anchoring requirement.
In the step 3, reference may be made to the following contents for implementing the new prestressed anchor rope 4:
forming hole of prestressed anchor cable
The prestressed anchor cable adopts mechanical hole forming, the inclination angle of an anchor hole is 12-20 degrees in the horizontal direction, and the hole forming of the anchor hole needs to adopt a pipe following drilling construction process to prevent collapse in the hole; considering the influence of sediment, in order to ensure the depth of the anchor cable, the actual drilling depth is 0.50m greater than the designed depth. After the anchor hole is formed, sediment in the anchor hole must be cleaned, and the cleaning is strived to be clean.
② prestressed anchor cable arrangement
Before the prestressed anchor cable rod body is used, straightening, derusting and deoiling are carried out, and blanking is carried out according to the designed size strictly; removing residual and disturbed waste soil in the hole as far as possible before the prestressed anchor cable is placed into the anchor hole; the prestressed anchor cable and the grouting pipe are placed into the anchor hole along the center line of the anchor hole, so that the disturbance collapse of a soil body on the hole wall is avoided, and if the soil body on the hole wall collapses, the anchor cable is pulled out to remove the collapsed soil body; and after the prestressed anchor cable is placed into the anchor hole, plugging and grouting are carried out in time.
Grouting prestressed anchor cable
The grouting body should be prepared strictly according to the design requirements and should not be changed at will. During grouting, the grouting pipe is inserted 50-100mm away from the bottom of the hole, the grouting pressure reaches 0.60MPa, the pressure is stabilized for 2 minutes until the grout overflows from the orifice, and otherwise, the grout is supplemented. After grouting, the anchor cable is not disturbed until the strength of the slurry does not reach the design requirement.
Tensioning and locking prestressed anchor cable
And when the slurry strength reaches 85% of the design strength, tensioning and locking are carried out, and after no abnormity exists in tensioning and locking, the exposed prestressed tendons cannot be cut off, so that force supplementing tensioning can be carried out at the later stage.
Practical case
A certain deepened excavation foundation pit engineering in Lanzhou, this engineering has adopted the stake anchor support system, because later stage design change (basement increases the layer), through the discussion, will consolidate the design to former supporting construction, adopt among the prior art commonly used "anchor rope to increase the layer and consolidate the design", but the deformation control of foundation ditch is whether effectual important index of test supporting construction, and this reinforcement mode does not gain ideal effect: after the reinforcing method is used, the foundation pit deformation indexes such as horizontal displacement, vertical displacement and deep soil displacement of the support piles of the foundation pit all meet the requirements, and the reinforcing scheme is not suitable for the conditions that some foundation pits are deeply excavated and the lateral soil pressure of the foundation pit is large.
Therefore, based on the actual condition of the foundation pit (the foundation pit is excavated deeply and the lateral soil pressure of the foundation pit is high), the essence that the problem occurs is that the embedment depth of the original support pile is not enough, and a reinforcing scheme capable of providing larger bearing capacity is adopted after the research, namely the reinforcing scheme of 'inserting the long support pile and the prestressed anchor cable between the piles of the original support pile': in the early stage, rigorous numerical simulation analysis is firstly carried out, and the result shows that the deformation indexes of the foundation pit all meet the requirements of relevant standards of the foundation pit, and the indexes are in a safety range. The field test, namely the field construction, is carried out at the later stage, the field monitoring of the deformation of the foundation pit is matched, the reinforcing effect of the reinforcing mode is further verified through monitoring data, and the reinforcing effect is compared with the early-stage simulation result, so that the conclusion is reached; the reinforcing structure of inserting the long supporting piles and the prestressed anchor cables between the piles of the original supporting piles can well control the deformation of the foundation pit and can provide powerful guarantee for the deepening and reinforcing of the foundation pit supported by the pile anchors.
The technical solution provided by the present invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (4)
1. A pile anchor supporting foundation pit deepening reinforcing and supporting structure is characterized by comprising an original supporting pile (1) in an original pile anchor supporting system, a waist beam (3) arranged on the original supporting pile (1), an original prestressed anchor cable of which the outer end is fixed on the waist beam (3), a newly-lengthened supporting pile (2), a newly-added prestressed anchor cable (4) and a newly-arranged crown beam (5); the new growth supporting piles (2) are arranged among the original supporting piles (1) and are kept on the same plane, the new growth supporting piles (2) penetrate through the new excavation depth of the whole foundation pit, the tops of the new growth supporting piles are flush with the tops of the original supporting piles (1), and the new growth supporting piles are connected into a whole through the newly arranged crown beams (5) in a pouring mode; the newly-added prestressed anchor cables (4) are distributed between the original supporting pile (1) and the newly-increased supporting pile (2) and are fixed on the wale (3) at the outer ends.
2. The reinforced supporting construction according to claim 1, characterized in that the diameter of the newly lengthened supporting pile (2) is equal to or greater than the diameter of the original supporting pile (1).
3. Reinforcing and supporting structure as claimed in claim 1, characterized in that said new extension piles (2) are laid one by one or two or more of said original piles (1).
4. The construction method for the pile-anchor supporting foundation pit deepening, reinforcing and supporting structure according to claim 1, wherein the construction method comprises the following steps:
breaking an original crown beam in an original pile anchor supporting system, and avoiding breaking main ribs of an original supporting pile (1) as much as possible in the breaking process;
inserting and implementing a newly-increased supporting pile (2) as required;
and after the implementation of all the newly-increased support piles (2) is finished, completing the construction of a newly-increased prestressed anchor cable (4) and the pouring of a newly-arranged crown beam (5), straightening the main reinforcement of the original support pile (1) as far as possible in the pouring process, and anchoring and pouring the main reinforcement in the newly-arranged crown beam (5) according to the principle of proximity.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011045839.9A CN112081118A (en) | 2020-09-29 | 2020-09-29 | Pile-anchor supporting foundation pit deepening reinforcing and supporting structure and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011045839.9A CN112081118A (en) | 2020-09-29 | 2020-09-29 | Pile-anchor supporting foundation pit deepening reinforcing and supporting structure and construction method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114076418A (en) * | 2021-10-27 | 2022-02-22 | 中交第二公路勘察设计研究院有限公司 | Heat exchange system based on deep buried pipe energy support pile and construction process |
| CN114197489A (en) * | 2021-12-31 | 2022-03-18 | 中国煤炭地质总局水文地质局 | Method for reinforcing slope protection pile during deepening of foundation pit |
-
2020
- 2020-09-29 CN CN202011045839.9A patent/CN112081118A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114076418A (en) * | 2021-10-27 | 2022-02-22 | 中交第二公路勘察设计研究院有限公司 | Heat exchange system based on deep buried pipe energy support pile and construction process |
| CN114076418B (en) * | 2021-10-27 | 2024-04-23 | 中交第二公路勘察设计研究院有限公司 | Heat exchange system based on deep buried pipe energy support pile and construction process |
| CN114197489A (en) * | 2021-12-31 | 2022-03-18 | 中国煤炭地质总局水文地质局 | Method for reinforcing slope protection pile during deepening of foundation pit |
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