CN213417846U - Foundation pit supporting structure adjacent to high-speed rail - Google Patents

Abstract

The application discloses underground structure of neighbouring high-speed railway, foundation ditch are located the below or one side of high-speed railway bridge, supporting structure includes supporting part, enclosure and reinforcement. The supporting part is arranged around the foundation pit, and at least part of the supporting part is positioned in the stable stratum; the enclosure part is connected between the supporting parts and integrally formed with the supporting parts to bear load together; the reinforcing part is arranged in the foundation pit and is close to the supporting part, and at least part of the reinforcing part is positioned below the bottom of the foundation pit and used for reinforcing the supporting part and the soil body. The utility model provides a foundation ditch supporting construction of neighbouring high-speed railway has the advantage that the deformation capacity is good of preapring for an unfavorable turn of events to foundation ditch and operation high-speed railway.

Description

Foundation pit supporting structure adjacent to high-speed rail

Technical Field

The application relates to the field of civil engineering, in particular to a foundation pit supporting structure adjacent to a high-speed rail.

Background

At present, foundation pit projects adjacent to an operating high-speed rail are increased day by day, the foundation pit excavation condition under the operating high-speed rail is more and more, the requirements of the operating high-speed rail on displacement and settlement are extremely strict, relevant specifications and railway departments only allow millimeter-grade deformation, the deformation of the operating high-speed rail is extremely easy to exceed the standard due to foundation pit excavation and later-stage road traffic load, and how to guarantee the stability of the foundation pit under the operating high-speed rail and the safety of the operating high-speed rail is very important. The deformation of the operating high-speed rail is difficult to meet the millimeter-scale deformation required by the specifications and railway departments strictly due to the conventional foundation pit supporting mode and the later-stage road traffic load, so that the foundation pit engineering beside the operating high-speed rail cannot pass the approval and cannot be started after a delay. And once the deformation of the operating high-speed rail exceeds the standard, the risk of influencing the driving safety is generated. The foundation pit supporting structure adjacent to the operation high-speed rail in the prior art has the problem of poor deformation prevention capability on the foundation pit and the operation high-speed rail.

SUMMERY OF THE UTILITY MODEL

In view of this, the embodiment of the present application is expected to provide a foundation pit supporting structure adjacent to a high-speed railway, so as to solve the problem that the deformation prevention capability of the foundation pit supporting structure adjacent to a high-speed railway for operation is poor for the foundation pit and the high-speed railway for operation.

In order to achieve the above object, an embodiment of the present application provides a supporting structure for a foundation pit adjacent to a high-speed railway, where the foundation pit is located below or on one side of a bridge of the high-speed railway, including:

the supporting part is arranged around the foundation pit, and at least part of the supporting part is positioned in the stable stratum;

the enclosure parts are connected among the supporting parts and form a whole with the supporting parts to bear load together; and

the reinforcing part is arranged in the foundation pit and is close to the supporting part, at least part of the reinforcing part is positioned below the bottom of the foundation pit, and the supporting part and the soil body are reinforced.

Further, the reinforcement portion includes:

a first mixing pile; and

and a jet grouting pile formed between the first mixing pile and the supporting part and connected with the first mixing pile and the supporting part.

Further, the length of the jet grouting pile is greater than or equal to that of the first stirring pile.

Furthermore, the cement mixing amount of the part of the first stirring pile below the bottom of the foundation pit is more than 20%, and the cement mixing amount of the part of the first stirring pile above the bottom of the foundation pit is more than 10%.

Further, the foundation pit comprises a pile distribution area with first stirring piles and a non-pile distribution area without the first stirring piles, at least two non-pile distribution areas are formed in the length direction of the foundation pit, each non-pile distribution area is rectangular, the width of each non-pile distribution area is 2-4 m, the net distance between every two adjacent non-pile distribution areas is 2-4 m, and the distance between each non-pile distribution area and the supporting part is 3-5 m.

Further, the supporting part includes:

the supporting piles are arranged around the foundation pit, are close to the reinforcing part and are at least partially positioned in the stable stratum; and

keep apart the stake, set up the pile foundation of bridge and between the fender pile, the enclosure connects at least the fender pile with keep apart the stake, it is right the pile foundation of bridge plays the guard action.

Furthermore, the supporting part also comprises a second stirring pile which is arranged on one side of the supporting pile close to the isolation pile and is close to the supporting pile, and at least part of the second stirring pile is positioned in a waterproof stratum below the bottom of the foundation pit.

And furthermore, the isolation piles are arranged in the range which is more than or equal to 10m away from the bridge bearing platform along the length direction of the foundation pit.

Further, the distance between the isolation pile and the pile foundation of the bridge is more than or equal to six times of the pile diameter of the pile foundation of the bridge.

Further, the enclosure includes:

a crown beam connected to the top of the supporting part;

the connecting beam is connected between the supporting piles and the crown beams on the isolation piles; and

and the connecting plate is arranged on the connecting beam and integrally bears the load together with the supporting part.

Further, the enclosure portion still includes one row at least bearing structure, bearing structure connects the foundation ditch both sides on the fender pile, for bearing structure provides the holding power, bearing structure includes:

a support bar;

the servo support axial force system is arranged at the end part of the support rod; and

and one end of the connecting rod is fixed on the servo supporting axial force system, and the other end of the connecting rod is fixed on the supporting pile, so that the supporting rod is connected to the supporting piles on two sides of the foundation pit.

The utility model provides a foundation ditch supporting construction of neighbouring high-speed railway, foundation ditch are located the below or one side of high-speed railway bridge, and supporting construction includes supporting part, enclosure and reinforcement. The supporting part is arranged around the foundation pit and used for supporting and reinforcing the foundation pit structure; the enclosure part is connected between the supporting parts and integrally bears load together with the supporting parts, so that the bearing capacity of the supporting structure is improved; the reinforcing part is arranged in the foundation pit and is close to the supporting part, so that the supporting part and the soil body are reinforced, and the strength of the supporting structure is improved. The supporting type of the supporting part, the enclosing part and the reinforcing part is adopted, the strength and the bearing capacity of the supporting structure adjacent to the high-speed rail are improved, the anti-deformation capacity of the foundation pit and the operation high-speed rail pier is good, meanwhile, the later-period permanent road traffic load is borne, and the permanent use of the temporary supporting structure of the foundation pit is realized.

Drawings

Fig. 1 is a schematic top view of a supporting structure of a foundation pit applied in an embodiment of the present application;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1; and

fig. 3 is a sectional view taken in the direction B-B in fig. 2.

Description of the reference numerals

1. A support structure; 2. a support section; 3. a containment part; 4. a reinforcing portion; 5. a bridge bearing platform; 6. a bridge pile foundation; 7. a high-speed rail bridge pier; 8. pile arrangement areas; 9. a non-pile-laying area; 10. a tunnel frame; 20. supporting piles; 21. isolating piles; 22. a second mixing pile; 30. a crown beam; 31. a connecting beam; 32. a connecting plate; 33. a support structure; 34. supporting in the concrete; 35. a tie-beam; 40. a first mixing pile; 41. carrying out jet grouting pile; 330. a support bar; 331. a servo support axial force system; 332. a connecting rod.

Detailed Description

It should be noted that, in the present application, technical features in examples and embodiments may be combined with each other without conflict, and the detailed description in the specific embodiment should be understood as an explanation of the gist of the present application and should not be construed as an improper limitation to the present application.

The directional terms used in the description of the present application are intended only to facilitate the description of the application and to simplify the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered limiting of the application.

The embodiment of the application provides a foundation pit supporting structure adjacent to a high-speed rail, and as shown in fig. 1-3, a foundation pit is located below or on one side of a high-speed rail bridge, and the supporting structure 1 comprises a supporting part 2, a surrounding part 3 and a reinforcing part 4. The supporting part 2 is arranged around the foundation pit and at least partially positioned in the stable stratum; the enclosure part 3 is connected between the supporting parts 2 and integrally formed with the supporting parts 2 to bear load together; the reinforcing part 4 is arranged in the foundation pit and is close to the supporting part 2, and at least part of the reinforcing part 4 is positioned below the bottom of the foundation pit to reinforce the supporting part 2 and the soil body.

According to the foundation pit supporting structure adjacent to the high-speed rail, as shown in fig. 1-3, the supporting part 2 is arranged around the foundation pit to support and reinforce the foundation pit structure; the enclosure parts 3 are connected between the supporting parts 2 and form a whole with the supporting parts 2 to bear load together, so that the bearing capacity of the supporting structure 1 is improved; the reinforcing part 4 is arranged in the foundation pit and is close to the supporting part 2, so that the supporting part 2 and the soil body are reinforced, and the strength of the supporting structure 1 is improved. The support type of the support part 2, the enclosure part 3 and the reinforcing part 4 is adopted, the strength and the bearing capacity of the support structure 1 adjacent to the high-speed rail are improved, and the support structure has the advantage of good deformation prevention capacity for a foundation pit and an operation high-speed rail pier 7.

In an embodiment, the reinforcement 4 comprises a first mixing stub 40. The first mixing pile 40 is arranged close to the supporting part 2, so that the strength of the supporting part 2 is increased, and the strength of the supporting structure 1 is improved.

In one embodiment, referring to fig. 2, the reinforcement 4 includes a first mixing stub 40 and a jet grouting stub 41. The jet grouting pile 41 is formed between the first mixing pile 40 and the supporting part 2, and is connected to the first mixing pile 40 and the supporting part 2. Through set up jet grouting pile 41 between first stirring stake 40 and support portion 2, jet grouting pile 41 makes first stirring stake 40, jet grouting pile 41 and support portion 2 zonulae occludens, consolidates support portion 2, improves excavation of foundation ditch face lower part soil body resistance, improves the anti-deformation ability of supporting construction 1 to foundation ditch and operation high-speed railway.

In one embodiment, the mixing pile is an effective form of soft foundation treatment, and cement is used as a main agent of a curing agent, and is sprayed into soil by using a mixing pile machine and is sufficiently mixed, so that the cement and the soil generate a series of physical and chemical reactions, and soft soil is hardened to improve the foundation strength. The cement mixing pile is divided into single-shaft, double-shaft and three-shaft mixing piles according to the construction method mainly used. Specifically, the first mixing pile 40 of the present application is a triaxial mixing pile.

Specifically, the first mixing pile 40 is a triaxial mixing pile, the diameter of the triaxial mixing pile is 850mm, and the pile-to-pile overlap is 250 mm. Can guarantee the intensity of triaxial stirring stake, can also control cost. The unconfined compressive strength of the triaxial mixing pile is more than 1.0Mpa, and the impermeability coefficient is less than 10^-7cm/s。

In one embodiment, referring to fig. 2, the length of the jet grouting pile 41 is equal to or greater than the length of the first mixing pile 40. The jet grouting pile 41 is arranged between the first stirring pile 40 and the supporting part 2, so that the first stirring pile 40, the jet grouting pile 41 and the supporting part 2 are tightly connected, the supporting part 2 is reinforced, and the resistance of the soil body at the lower part of the excavation surface of the foundation pit is improved. Therefore, the length of the jet grouting pile 41 is ensured to be larger than or equal to that of the first stirring pile 40, the first stirring pile 40 can be connected with the jet grouting pile 41 in the length direction, the connection among the first stirring pile 40, the jet grouting pile 41 and the supporting part 2 is ensured to be tighter, and further the resistance of the soil body at the lower part of the excavation surface of the foundation pit and the reliability of the supporting structure 1 are ensured.

In one embodiment, the cement content of the first mixing pile 40 is greater than 20% at the part below the bottom of the foundation pit, and the cement content of the first mixing pile is greater than 10% at the part above the bottom of the foundation pit. In the excavation process of foundation ditch, first stirring stake 40 plays the supporting effect to the foundation ditch. The first stirring stake 40 of the following part in foundation ditch bottom can continuously strengthen supporting construction 1, prevents that foundation ditch and operation high-speed railway pier 7 from taking place deformation, so cement mixing volume is greater than 20%, guarantees the intensity of first stirring stake 40. The first stirring stake 40 of part above the foundation ditch bottom is strengthened supporting construction 1 at the foundation ditch excavation in-process, prevents that foundation ditch and operation high-speed railway pier 7 from taking place deformation, and the first stirring stake 40 of part above the foundation ditch bottom can be dug along with the foundation ditch excavation together, just can satisfy the strength requirement when cement mixing volume is greater than 10%, and can practice thrift the cost.

In one embodiment, referring to fig. 3, the foundation pit bottom soil body is reinforced by a first mixing pile 40 through stripping or skirt reinforcement. The reinforcing method comprises the following steps that (1) the reinforcing of the strips and the reinforcing of the skirt edges refer to the horizontal arrangement form of foundation pit reinforcing measures, the reinforcing of the strips is to perform an intermittent reinforcing mode on the bottom of a foundation pit besides the reinforcing of the periphery of the foundation pit in the internal treatment of the foundation pit, and the reinforcing measures are arranged on the plane of the whole foundation pit to be similar to a grate; and the skirt edge reinforcement is to arrange reinforcement measures only around the foundation pit, and is similar to a circle of skirt edge with wide width. Specifically, the foundation pit bottom soil body is reinforced by a first stirring pile 40 through stripping.

In one embodiment, the foundation pit comprises the pile arrangement area 8 provided with the first stirring piles 40 and the pile non-arrangement area 9 not provided with the first stirring piles 40, at least two pile non-arrangement areas 9 are formed along the length direction of the foundation pit, and the arrangement of the pile non-arrangement areas 9 can save cost and does not influence the reinforcement of the foundation pit by the first stirring piles 40. It will be appreciated that the non-pile areas 9 may be of various shapes, such as irregular, parallelogram, rectangular, etc.

In one embodiment, referring to fig. 3, the foundation pit comprises a pile distribution area 8 distributed with first stirring piles 40 and a pile non-distribution area 9 not distributed with the first stirring piles 40, at least two pile non-distribution areas 9 are formed along the length direction of the foundation pit, each pile non-distribution area 9 is rectangular, the width of each pile non-distribution area 9 is 2 m-4 m, the net distance between two adjacent pile non-distribution areas 9 is 2 m-4 m, and the distance between the pile non-distribution areas 9 and the supporting part 2 is 3 m-5 m. Specifically, the width of each non-pile-laying area 9 is 3m, the net distance between two adjacent non-pile-laying areas 9 is 3m, and the distance between each non-pile-laying area 9 and the supporting part 2 is 4 m.

In one embodiment, as shown in fig. 1-3, the supporting part 2 includes supporting piles 20 and isolation piles 21. The support piles 20 are arranged around the foundation pit, are close to the reinforcing part 4 and are at least partially positioned in the stable stratum; the isolation pile 21 is arranged between the pile foundation of the bridge and the support pile 20, and the enclosure part 3 is at least connected with the support pile 20 and the isolation pile 21 and plays a role in protecting the pile foundation of the bridge. The support piles 20 are arranged around the foundation pit, so that the bearing capacity of the support structure 1 is improved, and the foundation pit is reinforced. Set up the fender pile 21 between foundation ditch fender pile 20 and high-speed railway bridge pile foundation 6, the foundation ditch that will excavate is kept apart with high-speed railway pier 7 pile foundation, and the protection has operated high-speed railway pier 7, reduces the pier deformation that foundation ditch fender pile 20 construction and foundation ditch excavation arouse.

Specifically, the isolation pile 21 is an isolation drilled pile, the support pile 20 is a support drilled pile, the pile diameters, the pile lengths, the pile distances, the support distances, the sizes and the like of the isolation drilled pile and the support drilled pile are determined by calculation through an elastic foundation beam method and three-dimensional finite element software, the pile diameters of the isolation drilled pile and the support drilled pile are 800 mm-1500 mm, and the clear distance between piles is 200 mm-500 mm. Because the isolation pile 21 is closer to the high-speed rail pier 7, the isolation bored pile adopts a full sleeve follow-up pile forming process, and the influence of the construction of the isolation pile 21 on the high-speed rail pier 7 is reduced.

In one embodiment, referring to fig. 1 to 3, the supporting part 2 further includes a second mixing pile 22 disposed on one side of the supporting pile 20 close to the isolation pile 21 and adjacent to the supporting pile 20, and the second mixing pile 22 is at least partially located in the impermeable ground layer below the bottom of the foundation pit. Because underground water is strictly forbidden to be pumped beside a high-speed rail, a second stirring pile 22 is arranged behind the foundation pit supporting pile 20 to form a water-stopping curtain for stopping water, underground water seepage in foundation pit excavation is prevented, the second stirring pile 22 on the plane forms a closed structure, and the second stirring pile 22 is inserted into a water-impermeable stratum at the lower part of the bottom of the foundation pit. Specifically, the second mixing pile 22 is a triaxial mixing pile, the diameter of the triaxial mixing pile is 850mm, and the pile-to-pile overlap is 250 mm. Can guarantee the intensity of triaxial stirring stake, can also control cost. The unconfined compressive strength of the mixing pile is more than 1.0Mpa, the impermeability coefficient is less than 10^-7cm/s, and the cement mixing amount is more than 20 percent.

In one embodiment, referring to fig. 1 and 3, the spacer piles 21 are arranged in a range of 10m or more from the bridge platform 5 in the length direction of the foundation pit. Set up the fender pile 21 between foundation ditch fender pile 20 and high-speed railway bridge pile foundation 6, the foundation ditch that will excavate is kept apart with high-speed railway pier 7 pile foundation, is in order to protect the high-speed railway pier 7 of having operated, reduces foundation ditch fender pile 20 construction and foundation ditch excavation and arouses the pier to warp. Therefore, the isolation piles 21 are arranged in the range which is more than or equal to 10m away from the bridge bearing platform 5 along the length direction of the foundation pit, the effect of reducing the deformation of the bridge pier caused by the construction of the foundation pit support piles 20 and the excavation of the foundation pit is achieved, and the construction efficiency and the control cost are also ensured. Specifically, the isolation piles 21 are arranged in the range of 10m away from the bridge bearing platform 5 in the length direction of the foundation pit.

In one embodiment, the distance between the isolation pile 21 and the bridge pile foundation is greater than or equal to six times of the pile diameter of the bridge pile foundation 6. When the distance between the isolation pile 21 and the bridge pile foundation is too small, the bridge pier may be directly deformed during the construction of the isolation pile 21. Therefore, it is required to ensure that the distance between the isolation piles 21 and the pile foundation of the bridge is sufficient, and the deformation of the bridge pier caused by the construction of the isolation piles 21 is prevented.

In one embodiment, as shown in fig. 1-3, the enclosure 3 includes a crown beam 30, a connecting beam 31, and a connecting plate 32. The crown beam 30 is connected to the top of the supporting part 2; the connecting beam 31 is connected between the supporting piles 20 and the crown beams 30 on the isolation piles 21; the connecting plate 32 is provided on the connecting beam 31 and receives a load together with the supporting part 2 as a whole. The supporting structure 1 for supporting a foundation pit supports and reinforces the foundation pit by a pile-slab supporting structure formed by supporting piles 20, isolation piles 21, crown beams 30, connection beams 31, and connection plates 32.

In an embodiment, referring to fig. 2, after a highway tunnel penetrating a high-speed rail is built, the upper road surface is used as a highway at the same time, the high-speed rail is operated to not allow highway loads to act on the ground and a bridge pile foundation 6 so as not to deform a high-speed rail bridge, the supporting structure 1 uses a pile plate supporting structure formed by a supporting pile 20, an isolation pile 21, a crown beam 30, a connecting beam 31 and a connecting plate 32 of a front-stage supporting foundation pit, the front-stage pile plate supporting structure is used for foundation pit supporting and bears soil pressure and water pressure loads in the horizontal direction, the later-stage pile plate supporting structure bears vertical road traffic loads, the road traffic loads are transmitted to a supporting soil layer in the lower part of the foundation pit, and the ground loads around a high-speed rail pier 7 and the deformation of the high-speed rail pier. The supporting construction of this application both had undertaken the permanent road surface traffic load in later stage again as foundation ditch temporary support in earlier stage, played dual function, had realized the permanent use of interim foundation ditch supporting construction 1.

In one embodiment, the isolation piles 21 and the support piles 20 are connected through the crown beams 30, the connecting beams 31 and the connecting plates 32 to form a double-row pile-slab supporting structure, and after the highway tunnel penetrating through the high-speed rail is built, the highway tunnel bears vertical road traffic load, the road traffic load is transmitted to a supporting soil layer in the lower deep part of the foundation pit, and the ground load around the high-speed rail pier 7 and the deformation of the high-speed rail pier 7 are reduced. Specifically, the thickness of the connecting plate 32 is 500mm, so that the bearing capacity and the overall strength of the supporting structure 1 are improved. The gap between the connecting beams 31 is 6m to 8 m.

In one embodiment, referring to fig. 2, the enclosure 3 further includes at least one row of support structures 33, the support structures 33 are connected to the piles 20 at both sides of the foundation pit to provide support force for the supporting structure 1, and the support structures 33 include support rods 330, a servo support axial force system 331 and a connecting rod 332. The servo support axial force system 331 is arranged at the end of the support rod 330; one end of the connecting rod 332 is fixed on the servo support axial force system 331, and the other end is fixed on the support pile 20, so that the support rod 330 is connected to the support piles 20 on both sides of the foundation pit. The servo supporting axial force system 331 is composed of a plurality of groups of jacks, oil channels, a control system and the like, is arranged at the end part of the supporting rod 330, can control the supporting axial force in real time, compensates the supporting axial force when the axial force is low, automatically gives an alarm when the axial force is high, can monitor the displacement of the supporting pile 20 in real time, and gives an alarm if the displacement of the supporting pile 20 exceeds a control value. The supporting structure 33 of the application is arranged, so that the supporting strength and the reliability of the supporting structure 1 are improved. The supporting construction of this application is strutted and is out of shape for a short time, the construction is convenient, through on-the-spot monitoring, and is obvious to the high-speed railway protection effect, can guarantee the high-speed railway safe operation at the millimeter level with high-speed railway deformation control, has very strong engineering practicality.

In an embodiment, the support structure 33 may be a steel support structure 33 or other metal support structure 33. Specifically, the support structure 33 is a steel support structure 33, the support rod 330 is a steel support rod 330, the connecting rod 332 is a steel waist beam, and the steel waist beam connects and fixes the steel support rod 330 fixed with the servo support axial force system 331 and the bored pile.

Specifically, as shown in fig. 2, the support structures 33 are arranged in a row at intervals of 3m to 4m along the length direction of the foundation pit, and in a row at intervals of 3m to 4m along the depth direction of the foundation pit. The cost and the construction time are saved while enough supporting force is provided for the foundation pit.

In an embodiment, referring to fig. 2, the enclosure 3 further includes a concrete inner support 34 connected to the top beam 30 of the support pile 20 on both sides of the foundation pit to provide a supporting force for the support pile 20, improve the supporting strength of the supporting structure 1, and prevent the foundation pit from deforming. Specifically, the distance between the concrete inner supports 34 along the length direction of the foundation pit is 6m to 8m, and the support structure 33 is arranged below the concrete inner supports 34.

In one embodiment, referring to fig. 1, the enclosure 3 further includes a tie beam 35 connected to at least two concrete inner supports 34 to increase the integrity of the supporting structure 1 and thus the strength and reliability of the supporting structure 1. Specifically, the tie beams 35 are made of concrete and are disposed at the middle of the concrete inner supports 34, and each tie beam 35 connects three concrete inner supports 34. A concrete cushion is laid at the bottom of the foundation pit, and a tunnel frame 10 of a highway tunnel passing a high-speed rail thereunder is formed above the concrete cushion.

The various embodiments/implementations provided herein may be combined with each other without contradiction.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. A supporting construction for a foundation pit adjacent to a high-speed railway, wherein the foundation pit is located below or on one side of a high-speed railway bridge, the supporting construction comprising:

the supporting part is arranged around the foundation pit, and at least part of the supporting part is positioned in the stable stratum;

the enclosure parts are connected among the supporting parts and form a whole with the supporting parts to bear load together; and

the reinforcing part is arranged in the foundation pit and is close to the supporting part, at least part of the reinforcing part is positioned below the bottom of the foundation pit, and the supporting part and the soil body are reinforced.

2. The supporting structure according to claim 1, wherein the reinforcing portion includes:

a first mixing pile; and

and a jet grouting pile formed between the first mixing pile and the supporting part and connected with the first mixing pile and the supporting part.

3. The support structure of claim 2, wherein the length of the jet grouting pile is equal to or greater than the length of the first mixing pile.

4. The supporting structure according to claim 2, wherein the foundation pit includes a pile distribution area in which the first mixing piles are distributed and a non-pile distribution area in which the first mixing piles are not distributed, at least two non-pile distribution areas are formed along a length direction of the foundation pit, each non-pile distribution area is rectangular, a width of each non-pile distribution area is 2m to 4m, a clear distance between two adjacent non-pile distribution areas is 2m to 4m, and a distance between the non-pile distribution area and the supporting part is 3m to 5 m.

5. The supporting structure according to claim 1, wherein the supporting portion includes:

the supporting piles are arranged around the foundation pit, are close to the reinforcing part and are at least partially positioned in the stable stratum; and

keep apart the stake, set up at the bridge pile foundation and between the fender pile, the enclosure connects at least the fender pile with keep apart the stake, it is right the bridge pile foundation plays the guard action.

6. The supporting structure of claim 5, wherein the supporting part further comprises a second mixing pile disposed on a side of the supporting pile adjacent to the isolation pile and abutting against the supporting pile, and the second mixing pile is at least partially located in a water-impermeable ground layer below the bottom of the foundation pit.

7. The supporting structure of claim 5, wherein the isolation piles are arranged within a distance of 10m or more from the bridge bearing platform in the length direction of the foundation pit.

8. The support structure of claim 5, wherein the distance between the isolation pile and the bridge pile foundation is greater than or equal to six times the diameter of the bridge pile foundation.

9. The support structure of claim 5, wherein the enclosure comprises:

a crown beam connected to the top of the supporting part;

the connecting beam is connected between the supporting piles and the crown beams on the isolation piles; and

and the connecting plate is arranged on the connecting beam and integrally bears the load together with the supporting part.

10. The support structure of claim 5, wherein the enclosure further comprises at least one row of support structures connected to the support piles on both sides of the foundation pit to provide support for the support structure, the support structures comprising:

a support bar;

the servo support axial force system is arranged at the end part of the support rod; and

and one end of the connecting rod is fixed on the servo supporting axial force system, and the other end of the connecting rod is fixed on the supporting pile, so that the supporting rod is connected to the supporting piles on two sides of the foundation pit.

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