CN114045840B - Soft soil deep foundation pit combined supporting structure and construction method - Google Patents
Soft soil deep foundation pit combined supporting structure and construction method Download PDFInfo
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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
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
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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
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- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
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Abstract
The utility model relates to a soft soil deep foundation pit combined supporting structure and a construction method, which are applied to the field of foundation pit supporting technology and comprise a double-row pile body, wherein the double-row pile body comprises a front row pile and a rear row pile which are arranged in parallel, the front row pile is arranged along the periphery of the foundation pit, the rear row pile is positioned on one side of the front row pile, which is back to the foundation pit, a pile top connecting beam is connected between the pile tops of the front row pile and the rear row pile, soft soil is filled between the front row pile and the rear row pile, water-stop curtain piles which are mutually meshed are arranged between the pile bodies of the adjacent front row pile, a plurality of supporting boxes are arranged in the foundation pit and are fixed in the soft soil at the bottom of the foundation pit, inclined supporting columns are arranged between the supporting boxes and the front row pile, and the supporting boxes and the inclined supporting columns are arranged in a one-to-one correspondence; one end of each inclined strut is hinged to the corresponding front row pile, the other end of each inclined strut is located in the supporting box, a supporting mechanism used for pushing each inclined strut to tightly support the corresponding front row pile is arranged in the foundation pit, and the supporting mechanism is fixed to the supporting box. This application has the effect that improves foundation ditch supporting construction's stability.
Description
Technical Field
The application relates to the technical field of foundation pit supporting, in particular to a soft soil deep foundation pit combined supporting structure and a construction method.
Background
The foundation pit support is a supporting, blocking, reinforcing and protecting measure adopted for the side wall of the foundation pit and the surrounding environment in order to ensure the safety of the construction of an underground structure and the surrounding environment of the foundation pit. The common foundation pit supporting modes comprise row pile supporting, underground continuous wall supporting, pile or wall supporting system, reinforced concrete row pile and other forms, can be selected after comprehensively evaluating the working conditions of the depth, soil quality and the like of the foundation pit, or can be reasonably combined by various supporting modes.
Chinese patent with publication number CN209443473U discloses a double-row pile supporting structure of a foundation pit, which comprises a front row of piles and a rear row of piles, wherein the front row of piles are inserted into a soil layer to a depth smaller than that of the rear row of piles; the top parts of the front row of piles and the rear row of piles are provided with cap beams; a cover plate is fixedly connected between the cap beam of the front row of piles and the cap beam of the rear row of piles; and soil among piles is filled between the front row of piles and the rear row of piles.
In view of the above related technologies, the inventor believes that in a soft soil foundation pit, due to the strong soft soil rheological property, the double-row pile supporting structure is prone to deformation when being squeezed by the soft soil, and therefore the whole foundation pit supporting structure is prone to deformation and damage.
Disclosure of Invention
In order to solve the problem that a double-row pile supporting structure is easy to deform and damage, the application provides a soft soil deep foundation pit combined supporting structure and a construction method.
In a first aspect, the application provides a soft soil deep foundation pit combined supporting structure, adopts following technical scheme:
a soft soil deep foundation pit combined supporting structure comprises double-row pile bodies arranged along the periphery of a foundation pit, wherein each double-row pile body comprises a front row pile and a rear row pile which are arranged in parallel, each front row pile is arranged along the periphery of the foundation pit, each rear row pile is positioned on one side, back to the foundation pit, of each front row pile, a pile top connecting beam is connected between pile tops of the front row piles and the pile tops of the rear row piles, soft soil is filled between the front row piles and the back row piles, waterproof curtain piles which are mutually occluded are arranged between adjacent pile bodies of the front row piles, a plurality of supporting boxes are arranged in the foundation pit and fixed in the soft soil at the bottom of the foundation pit, inclined supporting columns are arranged between the supporting boxes and the front row piles, and the supporting boxes and the inclined supporting columns are arranged in a one-to-one correspondence manner; one end of each inclined strut is hinged to the corresponding front row pile, the other end of each inclined strut is located in the corresponding support box, a tight supporting mechanism used for pushing the inclined struts to tightly support the front row piles is arranged in the foundation pit, and the tight supporting mechanism is fixed to the corresponding support box.
Through adopting above-mentioned technical scheme, the stagnant water curtain stake is used for the foundation ditch stagnant water, can form the support to double row pile body through bracing column and support tight mechanism to reduce double row pile body and take place to warp and lead to foundation ditch supporting structure to take place the possibility of deformation damage, thereby can improve foundation ditch supporting structure's stability. The support box increases the contact area of the diagonal brace and the soft soil in the foundation pit, so that the diagonal brace can more stably support the double-row pile body.
Optionally, the abutting mechanism comprises an abutting plate, a first linear driving assembly and a mounting seat, the abutting plate is sleeved on the diagonal brace and connected with the diagonal brace, the mounting seat is fixed at the top of the abutting box, one end of the first linear driving assembly is fixed on the mounting seat, and the other end of the first linear driving assembly is fixed on the abutting plate.
Through adopting above-mentioned technical scheme, promote through sharp drive assembly and support the fagging, make the bracing post can support tight front row pile to form more stable the strutting to the double row pile body, and then improve the effect of strutting of double row pile body to the foundation ditch.
Optionally, the support mechanism includes an auxiliary support assembly, a linear driving assembly ii, a mounting assembly, and a pair of brackets for fixing the mounting assembly, the diagonal brace is located between the pair of brackets, the brackets are fixed to the support box, and one end of each bracket, which is far away from the support box, is not fixed to the front row of piles; the mounting assembly is arranged on the support and slides in a reciprocating mode along the support, the mounting assembly is connected with the inclined strut and slides in a reciprocating mode along the inclined strut, the linear driving assembly II is fixed to the mounting assembly, one end of the auxiliary strut assembly is tightly supported to the front row of piles, the other end of the auxiliary strut assembly is sleeved with the inclined strut and slides in a reciprocating mode along the inclined strut, and the linear driving assembly II is tightly supported to the auxiliary strut assembly.
Through adopting above-mentioned technical scheme, the installation component is used for fixed sharp drive assembly two, and the support is used for the fixed mounting subassembly, promotes through sharp drive assembly two and assists the subassembly that props, makes to assist and props the subassembly and support the double row pile body tightly on the preceding row pile, also can make the bracing strut further tightly the preceding row pile through sharp drive assembly two simultaneously to make the double row pile body can strut the foundation ditch more steadily. In addition, the installation component can drive the second linear driving component to slide along the diagonal brace, and the auxiliary supporting component can also slide along the diagonal brace, so that the auxiliary supporting component can be abutted to any position of the front row of piles, the position of the auxiliary supporting component abutted to the front row of piles is adjusted according to the excavation depth of the foundation pit, the double-row pile bodies are supported more stably, and the double-row pile bodies are supported more stably on the foundation pit.
Optionally, the auxiliary supporting assembly comprises an auxiliary supporting plate, a straight supporting column and a supporting block, the supporting block is sleeved on the inclined supporting column and slides back and forth along the inclined supporting column, the second linear driving assembly is tightly supported on the supporting block, the supporting block is back to one side of the second linear driving assembly and is connected with the straight supporting column, the straight supporting column is far away from one end of the supporting block and is connected with the auxiliary supporting plate, and the auxiliary supporting plate is tightly supported on the front row of piles.
Through adopting above-mentioned technical scheme, the support point that the bracing subassembly has increased the bracing column to the front row pile forms two support points "upper", "lower", promotes through sharp drive assembly two and supports the kicking block, can make and assist the fagging and support tightly on the front row pile, also can make the bracing column further support tightly the front row pile simultaneously to make the bracing column can support the double row pile body more steadily.
Optionally, the straight supporting column includes a fixed column and a movable column slidably disposed in the fixed column, the fixed column is connected to the supporting block, the movable column is connected to the auxiliary supporting plate, and the fixed column is connected to the movable column through a connecting bolt; the movable column is provided with a plurality of connecting holes I along the length direction, the movable column is provided with a plurality of connecting holes II along the length direction, and the connecting bolts penetrate through the connecting holes I and the connecting holes II at the same time.
Through adopting above-mentioned technical scheme, straight dagger comprises fixed column and the movable column that mutual slip cup jointed, make straight dagger have flexible function, when supporting the kicking block, installation component and straight line drive assembly two remove assigned position and fixed back, adjust the movable column and make and assist the fagging and support tightly on the front row pile, make and support the kicking block and offset tightly with the bracing column, then pass connecting hole one and connecting hole two simultaneously with connecting bolt, make and assist fagging and straight dagger and support and can support on the front row pile, restart straight line drive assembly two and make and assist fagging and straight dagger and can further support the double row pile on the front row pile tightly.
Optionally, the installation component includes the mounting panel and connects the slider in the mounting panel both sides, the mounting panel cover is established just follow the reciprocal slip of bracing column on the bracing column, straight line drive assembly two is fixed on the mounting panel, it is in to support the bracer butt on the mounting panel, the slider is with a pair of leg joint just follows the reciprocal slip of support.
Through adopting above-mentioned technical scheme, the mounting panel is used for fixed sharp drive assembly two, and the slider just can slide along the support with leg joint to make mounting panel and sharp drive assembly two can follow the raking prop and slide, and can be fixed by the support after adjusting the position.
Optionally, the support includes a main rod, a plurality of auxiliary rods, and a clamping plate for fixing the mounting plate, the main rod is obliquely arranged along the diagonal bracing column and fixed on the supporting box, one end of the main rod, which is far away from the supporting box, is not fixed to the front row pile, the auxiliary rods are tightly propped against the main rod, and one end of the auxiliary rods, which is far away from the main rod, is inserted into soft soil at the bottom of the foundation pit; the clamping device is characterized in that a sliding hole for the sliding block to pass through in a matched mode is formed in the main rod, the sliding block can slide along the sliding hole, one side, back to the mounting plate, of the main rod is located on two sides of the sliding hole, a plurality of bearing plates are arranged on two sides of the sliding hole, the clamping plate is arranged on the bearing plates, and the sliding block is abutted to the clamping plate tightly.
Through adopting above-mentioned technical scheme, the slider can slide along the slide opening, makes the mounting panel can slide along the bracing post, through joint board bearing slider, bearing board bearing joint board to can be fixed the mounting panel.
Optionally, at least one blade is arranged on the part, located in the support box, of the diagonal bracing column.
Through adopting above-mentioned technical scheme, the blade can increase the bracing column and support the area of contact of incasement pouring, makes the bracing column can be more stable support double row pile body.
In a second aspect, the application provides a construction method for applying a soft soil deep foundation pit combined supporting structure, which adopts the following technical scheme:
a construction method for applying a soft soil deep foundation pit combined supporting structure comprises the following steps:
s1, calibrating pile positions of a front row of piles, a rear row of piles and a waterproof curtain pile on a construction site according to construction drawings, guiding holes by using a drilling machine according to the calibrated position of the waterproof curtain pile, spraying grouting by using a jet grouting machine, and forming the waterproof curtain pile after construction is finished;
s2, constructing double-row piles and pile top connecting beams, manufacturing pile body reinforcement cages, starting pile drilling according to the calibration positions of the front row piles and the rear row piles, placing the pile body reinforcement cages into the pile holes, pouring concrete, forming the front row piles and the rear row piles after the concrete is solidified, arranging a pile top connecting beam template between the front row piles and the rear row piles, pouring the concrete into the pile top connecting beam template, and forming the pile top connecting beams after the concrete is solidified;
s3, excavating soft soil to preliminarily form a foundation pit, reserving the soft soil on the side wall of the foundation pit to form a reserved soil slope while excavating the soft soil, wherein the distance between the top of the reserved soil slope and the bottom of the foundation pit is not less than 1/2 of the depth of the foundation pit;
s4, excavating soft soil along the periphery of the reserved soil slope in the foundation pit to form a plurality of pits for accommodating the supporting boxes;
s5, horizontally placing the support box into the pit, enabling the top of the support box to be located outside the pit, backfilling a gap between the support box and the pit with soil, and compacting;
s6, hoisting the diagonal brace into the foundation pit, enabling one end of the diagonal brace to be supported on the front row of piles, enabling the other end of the diagonal brace to be located in the supporting box, and then hinging the diagonal brace on the front row of piles;
s7, fixing a mounting seat on the top of the side wall of any supporting box;
s8, fixing one end of the first linear driving assembly on the mounting seat, fixing the other end of the first linear driving assembly on the supporting plate, and starting the first linear driving assembly to enable the inclined supporting columns to tightly support the front row of piles;
s9, pouring concrete into the supporting box, and enabling the inclined supporting columns to wrap the parts, located in the supporting box, of the inclined supporting columns;
s10, after the concrete is solidified, stopping the linear driving assembly I or the linear driving assembly I from continuously working to prop against the inclined strut;
s11, removing the reserved soil slope and finishing excavation of the foundation pit.
By adopting the technical scheme, the foundation pit is supported, and the eleven steps are summarized into three stages in total. The first stage is a waterproof curtain pile construction stage, and the waterproof curtain pile plays a role in stopping water of the foundation pit; the second stage is a double-row pile body construction stage, and the double-row pile bodies play roles in retaining soil and supporting the foundation pit; the third stage is the double row pile bearing diagonal construction stage, and it makes the bracing strut further support tightly the double row pile body to promote to support the fagging through sharp drive assembly one, can reduce the possibility that the double row pile body takes place to warp, and then the possibility that reducible whole foundation ditch supporting construction takes place to warp the damage.
In a third aspect, the application further provides a construction method applying the soft soil deep foundation pit combined supporting structure, and the following technical scheme is adopted:
a construction method applying a soft soil deep foundation pit combined supporting structure comprises the following steps:
s1, calibrating the pile positions of a front row of piles, a rear row of piles and a waterproof curtain pile on a construction site according to a construction drawing, guiding holes by using a drilling machine according to the marked position of the waterproof curtain pile, spraying grouting by using a jet grouting machine, and forming the waterproof curtain pile after construction is completed;
s2, constructing double-row piles and pile top connecting beams, manufacturing pile body reinforcement cages, starting pile drilling according to the calibration positions of the front row piles and the rear row piles, placing the pile body reinforcement cages into the pile holes, pouring concrete, forming the front row piles and the rear row piles after the concrete is solidified, arranging a pile top connecting beam template between the front row piles and the rear row piles, pouring the concrete into the pile top connecting beam template, and forming the pile top connecting beams after the concrete is solidified;
s3, excavating soft soil to initially form a foundation pit, reserving the soft soil on the side wall of the foundation pit to form a reserved soil slope while excavating the soft soil, wherein the distance between the top of the reserved soil slope and the bottom of the foundation pit is not less than 1/2 of the depth of the foundation pit;
s4, excavating soft soil along the periphery of the reserved soil slope in the foundation pit to form a plurality of pits for accommodating the supporting boxes;
s5, horizontally placing the support box into the pit, enabling the top of the support box to be located outside the pit, backfilling a gap between the support box and the pit with soil, compacting, and pouring concrete into the support box;
s6, sleeving the mounting plate on the inclined strut, sleeving the support block on the inclined strut, binding the mounting plate and the straight strut on the inclined strut, hoisting the inclined strut into the foundation pit, supporting one end of the inclined strut on the front row of piles, supporting the other end of the inclined strut on the bottom surface of the support box, and hinging the inclined strut on the front row of piles;
s7, fixing the two linear driving assemblies on the mounting plate through bolts;
s8, uniformly inserting a plurality of auxiliary rods on the reserved soil slope, enabling one ends of the auxiliary rods to penetrate through the reserved soil slope and be inserted into soft soil at the bottom of the foundation pit, and enabling the other ends of the auxiliary rods to be located outside the reserved soil slope;
s9, hanging the main rod into the foundation pit, fixing one end of the main rod on the side wall of the support box, extending the other end of the main rod to the front row of piles along the diagonal support column and abutting against the front row of piles, supporting the auxiliary rod on the main rod at the moment, simultaneously detaching the mounting plate from the diagonal support column, penetrating the sliding block through the sliding hole, adjusting the position of the mounting plate, placing the clamping plate on a bearing plate below the mounting plate, and fixing the mounting plate;
s10, after the length of the straight supporting column is adjusted, the connecting bolt penetrates through the first connecting hole and the second connecting hole and is screwed, so that the auxiliary supporting plate is tightly propped against the front row of piles, and the propping block is tightly propped against the inclined supporting column;
s11, starting the second linear driving assembly to enable the second linear driving assembly to push the support block towards the front row of piles;
and S12, removing the reserved soil slope and completing foundation pit excavation.
By adopting the technical scheme, the foundation pit is supported, and the twelve steps are totally summarized into three stages. The first stage is a waterproof curtain pile construction stage, and the waterproof curtain pile plays a role in stopping water of the foundation pit; the second stage is a double-row pile body construction stage, and the double-row pile bodies play roles in retaining soil and supporting a foundation pit; the third stage is the double row pile bearing diagonal construction stage, supports the double row pile body through bracing post and supplementary subassembly, and can promote to assist through sharp drive assembly two and prop the subassembly and support the double row pile body, and the bracing post also further supports tight double row pile body under the effect of sharp drive assembly two simultaneously to can further reduce the possibility that the double row pile body takes place to warp, and then the possibility that reducible whole excavation supporting structure takes place to warp and damages.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the supporting plate is pushed by the first linear driving assembly, so that the inclined supporting columns can further tightly support the front row piles, the double-row pile bodies are supported more stably, and the supporting effect of the double-row pile bodies on the foundation pit is improved;
2. the auxiliary supporting component is additionally provided with supporting points of the inclined supporting columns for the piles in the front row to form an upper supporting point and a lower supporting point, the supporting blocks are pushed by the linear driving component II, the auxiliary supporting plates can be tightly supported on the piles in the front row, and meanwhile the inclined supporting columns can be further tightly supported on the piles in the front row, so that the inclined supporting columns can more stably support the double-row pile bodies;
3. the reserved soil slope can support the double-row pile bodies when the inclined supporting columns are tightly abutted to the front row piles without starting the linear driving assembly, so that the possibility of deformation of the double-row pile bodies can be reduced.
Drawings
Fig. 1 is a schematic view of a soft soil deep foundation pit combined supporting structure in an embodiment of the present application.
FIG. 2 is a cross-sectional view of a support box according to an embodiment of the present disclosure.
Fig. 3 is a schematic position diagram of a reserved soil slope in the first embodiment of the present application.
Fig. 4 is a schematic view of a soft soil deep foundation pit combined supporting structure in the second embodiment of the present application.
Fig. 5 is a schematic view of the abutting mechanism in the second embodiment of the present application.
Fig. 6 is a schematic position diagram of a reserved soil slope in the second embodiment of the present application.
Reference numerals: 1. a double row pile body; 101. front row piles; 102. back row of piles; 103. connecting the pile top with a beam; 2. waterproof curtain piles; 3. supporting the box; 4. a diagonal bracing column; 5. a tightening mechanism; 51. supporting plates; 52. a first linear driving component; 53. a mounting seat; 54. a secondary support assembly; 541. auxiliary supporting plates; 542. a straight support column; 5421. fixing a column; 54211. a first connecting hole; 5422. a movable post; 54221. a second connecting hole; 543. a support block; 55. a second linear driving assembly; 56. mounting the component; 561. mounting a plate; 562. a slider; 57. a support; 571. a main rod; 5711. a slide hole; 572. an auxiliary rod; 573. a clamping plate; 58. a connecting bolt; 6. a bearing plate; 7. a blade; 8. and reserving a soil slope.
Detailed Description
The present application is described in further detail below with reference to figures 1-6.
The first embodiment is as follows:
the embodiment of the application discloses soft soil deep basal pit combination supporting construction.
Referring to fig. 1, soft soil deep foundation pit combined supporting structure comprises double-row pile bodies 1 arranged along the periphery of a foundation pit, wherein each double-row pile body 1 is composed of front-row piles 101, rear-row piles 102 and pile top connecting beams 103, the front-row piles 101 and the rear-row piles 102 are arranged in parallel, the front-row piles 101 are uniformly distributed along the periphery of the foundation pit, the rear-row piles 102 are distributed in soft soil outside the foundation pit, the pile top connecting beams 103 are connected between the pile tops of the front-row piles 101 and the pile tops of the rear-row piles 102, and the double-row pile bodies 1 play roles in retaining soil and supporting the foundation pit. Waterproof curtain piles 2 which are mutually occluded are arranged among pile bodies of the front row piles 101, and the waterproof curtain piles 2 play a role in stopping water of the foundation pit.
Referring to fig. 2, a plurality of supporting boxes 3 are uniformly distributed in the foundation pit along the periphery of the front row of piles 101, the supporting boxes 3 are fixed in soft soil at the bottom of the foundation pit, each supporting box 3 is internally provided with one diagonal brace 4, one end of each diagonal brace 4 is positioned in each supporting box 3, and the other end of each diagonal brace 4 is hinged to the front row of piles 101. Support and be fixed with on the case 3 and be used for promoting the bracing column 4 and support tight mechanism 5 that supports of front row of pile 101, support tight mechanism 5 by supporting fagging 51, linear drive subassembly 52 and mount pad 53 constitute, it cup joints and fixes on bracing column 4 to support the fagging 51, mount pad 53 is fixed on supporting the lateral wall of case 3, the one end of linear drive subassembly 52 is fixed on mount pad 53, the other end supports tightly on supporting the board 51, linear drive subassembly 52 can adopt hydraulic push rod, the jack, the screw rod etc. in this embodiment, linear drive subassembly 52 adopts the jack. The first linear driving assembly 52 is started to enable the inclined strut 4 to further abut against the front row of piles 101, so that the stability of the double-row pile body 1 can be further improved, and the stability of a foundation pit supporting structure can be further improved.
In addition, support case 3 and be the stereoplasm uncovered box, can increase the area of contact of bracing column 4 and foundation ditch bottom weak soil on the one hand through supporting case 3, make bracing column 4 can support double row pile body 1 more steadily. On the other hand, after the first linear driving assembly 52 pushes the inclined supporting columns 4 to further abut against the front row of piles 101, concrete is poured into the abutting box 3, after the concrete is completely solidified, the first linear driving assembly 52 can be stopped in consideration of energy conservation, and if the energy conservation is not considered, the first linear driving assembly 52 can be continuously used for assisting in abutting against the inclined supporting columns 4, so that the inclined supporting columns 4 can more stably support the double-row pile body 1.
Referring to fig. 2, in addition, the part that the bracing column 4 is located to support the case 3 is connected with at least one blade 7, can increase the area of contact between bracing column 4 and the concrete through blade 7, further improves the support effect of bracing column 4 to double row pile body 1, and then improves the effect of strutting of double row pile body 1 to the foundation ditch.
The implementation principle of the soft soil deep foundation pit combined supporting structure provided by the embodiment of the application is as follows: the inclined supporting columns 4 are pushed to tightly abut against the double-row pile bodies 1 through the linear driving assemblies 52, so that the possibility that the deformation damage of the foundation pit supporting structure caused by the deformation of the double-row pile bodies 1 can be reduced.
The embodiment of the application also discloses a construction method applying the soft soil deep foundation pit combined supporting structure.
Referring to fig. 1, 2 and 3, a construction method for applying a soft soil deep foundation pit combined supporting structure includes the following steps:
s1, calibrating pile positions of a front row pile 101, a rear row pile 102 and a waterproof curtain pile 2 on a construction site according to construction drawings, guiding holes by using a drilling machine according to the calibration position of the waterproof curtain pile 2, spraying and grouting by using a jet grouting machine, forming the waterproof curtain pile 2 after construction is finished, and achieving the purpose of foundation pit water stopping through the waterproof curtain pile 2;
s2, constructing double-row piles and pile top connecting beams 103, manufacturing pile body reinforcement cages, starting pile drilling according to the calibration positions of front-row piles 101 and rear-row piles 102, placing the pile body reinforcement cages into the pile holes, pouring concrete, forming the front-row piles 101 and the rear-row piles 102 after the concrete is solidified, arranging pile top connecting beam 103 templates between the front-row piles 101 and the rear-row piles 102, then pouring the concrete into the pile top connecting beam 103 templates, forming the pile top connecting beams 103 after the concrete is solidified, and realizing soil retaining and supporting on the foundation pit by the double-row pile bodies 1;
s3, excavating soft soil to preliminarily form a foundation pit, reserving the soft soil on the side wall of the foundation pit to form a reserved soil slope 8 while excavating the soft soil, wherein the distance between the top of the reserved soil slope 8 and the bottom of the foundation pit is not less than 1/2 of the depth of the foundation pit, and the reserved soil slope 8 can support the double-row pile bodies 1, so that the possibility of deformation of the double-row pile bodies 1 can be reduced;
s4, excavating soft soil along the periphery of the reserved soil slope 8 in the foundation pit to form a plurality of pits for accommodating the supporting boxes 3;
s5, horizontally placing the support box 3 into the pit, enabling the top of the support box 3 to be located outside the pit, backfilling a gap between the support box 3 and the pit with soil and compacting, and enabling the support box 3 to be stably fixed in soft soil;
s6, hoisting the diagonal bracing column 4 into the foundation pit, enabling one end of the diagonal bracing column 4 to be supported on the front row of piles 101 in a propping manner, enabling the other end of the diagonal bracing column 4 to be located in the propping box 3, and then hinging the diagonal bracing column 4 to the front row of piles 101;
s7, fixing a mounting seat 53 at the top of the side wall of any supporting box 3;
s8, fixing one end of the first linear driving assembly 52 on the mounting seat 53, fixing the other end of the first linear driving assembly 52 on the supporting plate 51, and starting the first linear driving assembly 52 to enable the inclined supporting columns 4 to tightly support the front row of piles 101;
s9, pouring concrete into the supporting box 3, enabling the inclined supporting columns 4 to wrap the parts, located in the supporting box 3, of the inclined supporting columns and the blades 7, increasing the contact area of the inclined supporting columns 4 and the concrete through the blades 7, and enabling the inclined supporting columns 4 to stably support the double-row pile bodies 1;
s10, after the concrete is solidified, stopping the linear driving assembly I52, and only tightly abutting against the front row of piles 101 through the inclined supporting columns 4 to achieve the energy-saving effect; or the first linear driving assembly 52 continues to work to assist in propping against the diagonal bracing column 4, so that the diagonal bracing column 4 can more stably support the front row pile 101 body;
s11, removing the reserved soil slope 8 and finishing excavation of the foundation pit.
The second embodiment:
referring to fig. 4 and 5, the difference between the first embodiment and the second embodiment is that the soft soil deep foundation pit combined supporting structure, the abutting mechanism 5 includes a secondary supporting component 54, a second linear driving component 55, a mounting component 56 and a pair of brackets 57 for fixing the mounting component 56, wherein one bracket 57 is fixed on one side of the bracing column 4, and the other bracket 57 is fixed on the other side of the bracing column 4. The mounting assembly 56 is composed of a mounting plate 561 and sliders 562 fixed on two sides of the mounting plate 561, the mounting plate 561 is slidably sleeved on the diagonal support 4, the sliders 562 are slidably connected with the support 57, the mounting plate 561 can move along the diagonal support 4, and the support 57 can fix the sliders 562 after the position of the mounting plate 561 is adjusted. The second linear driving assembly 55 is fixed on the mounting plate 561, and the second linear driving assembly 55 may adopt a jack, a push rod, a screw rod, and the like, in this embodiment, the second linear driving assembly 55 adopts an electric push rod. One end of the auxiliary supporting component 54 is tightly supported on the front row of piles 101, the other end of the auxiliary supporting component 54 is connected with the inclined supporting column 4 in a sliding mode, the second linear driving component 55 is tightly supported at one end, far away from the front row of piles 101, of the auxiliary supporting component 54, the second linear driving component 55 pushes the auxiliary supporting component 54, the auxiliary supporting component 54 is tightly supported on the front row of piles 101 to support the double-row pile bodies 1, meanwhile, the inclined supporting column 4 can be further tightly supported on the front row of piles 101 through the second linear driving component 55, and therefore the double-row pile bodies 1 can stably support a foundation pit.
Referring to fig. 4 and 5, the auxiliary supporting assembly 54 includes an auxiliary supporting plate 541, a straight supporting column 542 and a supporting block 543, the straight supporting column 542 includes a fixed column 5421 and a movable column 5422 which are slidably sleeved with each other, the movable column 5422 is connected with the auxiliary supporting plate 541, the fixed column 5421 is connected with the supporting block 543, and the movable column 5422 is disposed in the fixed column 5421 and connected by the connecting bolt 58, so that the straight supporting column 542 can extend and retract. One side of the auxiliary supporting plate 541 back to the movable column 5422 abuts against the piles 101 in the front row, the abutting block 543 is slidably sleeved on the inclined supporting column 4, and the second linear driving assembly 55 pushes the straight supporting column 542 and the auxiliary supporting plate 541 to further abut against the piles 101 in the front row to support the double-row pile bodies 1. Because supporting block 543 can be followed the bracing column 4 and slided, mounting panel 561 drives two 55 of sharp drive assembly and slides along the bracing column 4, and straight bracing column 542 is scalable to make and assist the optional position that props subassembly 54 can support tightly at front row pile 101, so that excavate the position that degree of depth adjustment was assisted to prop subassembly 54 tightly on front row pile 101 according to the foundation ditch, thereby support double row pile body 1 more steadily, and then make double row pile body 1 support the foundation ditch more steadily.
Referring to fig. 5, the fixed post 5421 is provided with a plurality of first connection holes 54211 along its length direction, the movable post 5422 is provided with a plurality of second connection holes 54221 along its length direction, and the movable post 5422 and the fixed post 5421 can be fixed by inserting the connection bolt 58 into the first connection holes 54211 and the second connection holes 54221 at the same time and tightening the connection bolt 58.
Referring to fig. 5, the bracket 57 includes a main rod 571, a plurality of auxiliary rods 572, and a clamping plate 573 for fixing the mounting plate 561, the main rod 571 is obliquely disposed along the direction of the diagonal brace 4 and fixed on the top of the sidewall of the supporting box 3, one end of the main rod 571, which is far away from the supporting box 3, abuts against the front row of piles 101, a sliding hole 5711 for the slider 562 to pass through in a matching manner is disposed on the main rod 571, and the slider 562 can move stably after passing through the sliding hole 5711. The side of the main rod 571, which is opposite to the mounting plate 561, on the two sides of the sliding hole 5711 is connected with a plurality of supporting plates 6, after the mounting plate 561 is moved to a designated position by a linear driving device, a suspension device or a manual operation, the clamping plate 573 is placed on two supporting plates 6 at the same horizontal height below the slider 562, and the slider 562 is abutted against the clamping plate 573, so that the mounting plate 561 is fixed.
The implementation principle of the soft soil deep foundation pit combined supporting structure in the embodiment of the application is as follows: the supporting points of the inclined supporting columns 4 on the front row piles 101 are added to the auxiliary supporting plates 541 to form two supporting points of an upper supporting point and a lower supporting point, the supporting blocks 543 are pushed through the second linear driving assembly 55, the straight supporting columns 542 can push the auxiliary supporting plates 541 to be tightly abutted to the front row piles 101, meanwhile, the inclined supporting columns 4 can be further tightly abutted to the front row piles 101, and therefore the inclined supporting columns 4 can more stably support the double-row pile bodies 1. In addition, the mounting plate 561 can drive the second linear driving assembly 55 to slide along the diagonal brace 4, and the supporting block 543 can also slide along the diagonal brace 4, so that the auxiliary bracing plate 541 and the straight brace 542 can be abutted against any position on the front row pile 101, and the position where the auxiliary bracing plate 541 is abutted against the front row pile 101 can be adjusted according to the excavation depth of the foundation pit, so that the double row pile body 1 is more stably supported, and the double row pile body 1 is more stably supported for the foundation pit.
The embodiment of the application also discloses a construction method applying the soft soil deep foundation pit combined supporting structure.
Referring to fig. 4, 5 and 6, a construction method for applying a soft soil deep foundation pit combined supporting structure includes the following steps:
s1, calibrating pile positions of a front row pile 101, a rear row pile 102 and a waterproof curtain pile 2 on a construction site according to construction drawings, guiding holes by using a drilling machine according to the calibration position of the waterproof curtain pile 2, spraying and grouting by using a jet grouting machine, forming the waterproof curtain pile 2 after construction is finished, and achieving the purpose of foundation pit water stopping through the waterproof curtain pile 2;
s2, constructing double-row piles and pile top connecting beams 103, manufacturing pile body reinforcement cages, starting pile drilling according to the calibration positions of front-row piles 101 and rear-row piles 102, placing the pile body reinforcement cages into the pile holes, pouring concrete, forming the front-row piles 101 and the rear-row piles 102 after the concrete is solidified, arranging pile top connecting beam 103 templates between the front-row piles 101 and the rear-row piles 102, then pouring the concrete into the pile top connecting beam 103 templates, forming the pile top connecting beams 103 after the concrete is solidified, and realizing soil retaining and supporting on the foundation pit by the double-row pile bodies 1;
s3, excavating soft soil to preliminarily form a foundation pit, reserving the soft soil on the side wall of the foundation pit to form a reserved soil slope 8 while excavating the soft soil, wherein the distance between the top of the reserved soil slope 8 and the bottom of the foundation pit is not less than 1/2 of the depth of the foundation pit, and the reserved soil slope 8 can support the double-row pile bodies 1, so that the possibility of deformation of the double-row pile bodies 1 can be reduced;
s4, excavating soft soil along the periphery of the reserved soil slope 8 in the foundation pit to form a plurality of pits for accommodating the supporting boxes 3;
s5, horizontally placing the supporting box 3 into the pit, enabling the top of the supporting box 3 to be located outside the pit, backfilling a gap between the supporting box 3 and the pit with soil, compacting, pouring concrete into the supporting box 3 at the same time, enabling the supporting box 3 to be stably fixed in soft soil, and enabling the inclined supporting columns 4 to more stably support the front row pile 101 body;
s6, sleeving a mounting plate 561 on the inclined strut 4, sleeving a support block 543 on the inclined strut 4, binding the mounting plate 561 and the straight strut 542 on the inclined strut 4, hoisting the inclined strut 4 into a foundation pit, enabling one end of the inclined strut 4 to support against the front row of piles 101, enabling the other end of the inclined strut 4 to support against the bottom surface of the support box 3, and then hinging the inclined strut 4 on the front row of piles 101;
s7, fixing the second linear driving assembly 55 on the mounting plate 561 through bolts, so that the second linear driving assembly 55 can stably push the supporting block 543 and can move together with the mounting plate 561;
s8, uniformly inserting a plurality of auxiliary rods 572 on the reserved soil slope 8, so that one ends of the auxiliary rods 572 penetrate through the reserved soil slope 8 and are inserted into soft soil at the bottom of the foundation pit, and the other ends of the auxiliary rods 572 are positioned outside the reserved soil slope 8;
s9, hanging the main rod 571 into the foundation pit, fixing one end of the main rod 571 on the side wall of the support box 3, extending the other end of the main rod 571 to the front row pile 101 along the diagonal brace 4 and abutting against the front row pile 101, supporting the auxiliary rod 572 on the main rod 571, and supporting the main rod 571 through the auxiliary rod 572 to increase the stability of the main rod 571, so that the main rod 571 can more stably fix the mounting plate 561; meanwhile, the mounting plate 561 is separated from the diagonal bracing column 4, the slide block 562 passes through the slide hole 5711, the position of the mounting plate 561 is adjusted, and then the clamping plate 573 is placed on the supporting plate 6 below the mounting plate 561 to fix the mounting plate 561;
s10, after the length of the straight supporting columns 542 is adjusted, the connecting bolts 58 penetrate through the connecting holes 54211 and the connecting holes 54221 and are screwed tightly, so that the auxiliary supporting plates 541 are abutted against the front row of piles 101, and the abutting blocks 543 are abutted against the inclined supporting columns 4, so that the double-row pile bodies 1 are supported;
s11, starting the second linear driving assembly 55 to enable the second linear driving assembly 55 to push the supporting block 543 towards the front row of piles 101, enabling the auxiliary supporting plate 541 to be tightly supported on the front row of piles 101, and enabling the inclined supporting columns 4 to be further tightly supported on the front row of piles 101, so that the inclined supporting columns 4 can more stably support the double-row pile bodies 1;
and S12, removing the reserved soil slope 8 and finishing excavation of the foundation pit.
The above are preferred embodiments of the present application, and the scope of protection of the present application is not limited thereto, so: equivalent changes in structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (3)
1. The utility model provides a weak soil deep basal pit combination supporting construction, include double row pile body (1) that sets up along the foundation ditch periphery, double row pile body (1) is including front row pile (101) and back row pile (102) of mutual parallel arrangement, front row pile (101) set up along the foundation ditch periphery, back row pile (102) are located one side of front row pile (101) foundation ditch dorsad, be connected with pile bolck even roof beam (103) between the pile bolck of front row pile (101) and back row pile (102), the weak soil is filled between front row pile (101) and back row pile (102), its characterized in that: waterproof curtain piles (2) which are mutually meshed are arranged between pile bodies of adjacent front row piles (101), a plurality of supporting boxes (3) are arranged in a foundation pit, the supporting boxes (3) are fixed in soft soil at the bottom of the foundation pit, inclined supporting columns (4) are arranged between the supporting boxes (3) and the front row piles (101), and the supporting boxes (3) and the inclined supporting columns (4) are arranged in a one-to-one correspondence manner; one end of each inclined strut (4) is hinged to the front row of piles (101), the other end of each inclined strut (4) is located in the supporting box (3), a supporting mechanism (5) used for pushing the inclined struts (4) to tightly support the front row of piles (101) is arranged in the foundation pit, and the supporting mechanism (5) is fixed on the supporting box (3);
the supporting mechanism (5) comprises an auxiliary supporting assembly (54), a linear driving assembly II (55), a mounting assembly (56) and a pair of supports (57) for fixing the mounting assembly (56), the inclined supporting column (4) is positioned between the pair of supports (57), the supports (57) are fixed on the supporting box (3), and one end, far away from the supporting box (3), of each support (57) is not fixed with the front row of piles (101); the mounting assembly (56) is arranged on the support (57) and slides in a reciprocating manner along the support (57), the mounting assembly (56) is connected with the inclined strut (4) and slides in a reciprocating manner along the inclined strut (4), the linear driving assembly II (55) is fixed on the mounting assembly (56), one end of the auxiliary strut assembly (54) is tightly propped against the front row of piles (101), the other end of the auxiliary strut assembly (54) is sleeved on the inclined strut (4) and slides in a reciprocating manner along the inclined strut (4), and the linear driving assembly II (55) is tightly propped against the auxiliary strut assembly (54);
the auxiliary supporting assembly (54) comprises an auxiliary supporting plate (541), a straight supporting column (542) and a supporting block (543), the supporting block (543) is sleeved on the inclined supporting column (4) and slides along the inclined supporting column (4) in a reciprocating mode, the second linear driving assembly (55) is tightly supported on the supporting block (543), one side, back to the second linear driving assembly (55), of the supporting block (543) is connected with the straight supporting column (542), one end, far away from the supporting block (543), of the straight supporting column (542) is connected with the auxiliary supporting plate (541), and the auxiliary supporting plate (541) is tightly supported on the front row of piles (101);
the straight supporting column (542) comprises a fixed column (5421) and a movable column (5422) which is arranged in the fixed column (5421) in a sliding mode, the fixed column (5421) is connected with the supporting block (543), the movable column (5422) is connected with the auxiliary supporting plate (541), and the fixed column (5421) and the movable column (5422) are connected through a connecting bolt (58); a plurality of first connecting holes (54211) are formed in the fixed column (5421) along the length direction of the fixed column, a plurality of second connecting holes (54221) are formed in the movable column (5422) along the length direction of the movable column, and the connecting bolts (58) penetrate through the first connecting holes (54211) and the second connecting holes (54221) simultaneously;
the mounting assembly (56) comprises a mounting plate (561) and sliders (562) connected to two sides of the mounting plate (561), the mounting plate (561) is sleeved on the inclined strut (4) and slides in a reciprocating mode along the inclined strut (4), the linear driving assembly II (55) is fixed on the mounting plate (561), the support supporting blocks (543) abut against the mounting plate (561), and the sliders (562) are connected with the pair of supports (57) and slide in a reciprocating mode along the supports (57);
the support (57) comprises a main rod (571), a plurality of auxiliary rods (572) and a clamping plate (573) for fixing the mounting plate (561), the main rod (571) is obliquely arranged along the direction of the diagonal brace (4) and fixed on the support box (3), one end, far away from the support box (3), of the main rod (571) is not fixed with the front row of piles (101), the auxiliary rods (572) are tightly propped against the main rod (571), and one end, far away from the main rod (571), of the auxiliary rod (572) is inserted into soft soil at the bottom of a foundation pit;
the main rod (571) is provided with a sliding hole (5711) through which the sliding block (562) can penetrate in a matching mode, the sliding block (562) can slide along the sliding hole (5711), one side, back to the mounting plate (561), of the main rod (571) is provided with a plurality of supporting plates (6) on two sides of the sliding hole (5711), the clamping plate (573) is arranged on the supporting plates (6), and the sliding block (562) abuts against the clamping plate (573).
2. The soft soil deep foundation pit combined supporting structure of claim 1, wherein: the part of the inclined supporting column (4) located in the supporting box (3) is provided with at least one blade (7).
3. A construction method for applying the soft soil deep foundation pit combined supporting structure of claim 1, wherein the construction method comprises the following steps: the method comprises the following steps:
s1, calibrating pile positions of a front row of piles (101), a rear row of piles (102) and a waterproof curtain pile (2) on a construction site according to construction drawings, guiding holes by using a drilling machine according to the calibration position of the waterproof curtain pile (2), spraying and grouting by using a jet grouting machine, and forming the waterproof curtain pile (2) after construction is completed;
s2, constructing double-row piles and a pile top connecting beam (103), manufacturing a pile body reinforcement cage, starting pile drilling according to the calibration positions of front row piles (101) and rear row piles (102), placing the pile body reinforcement cage into pile holes, pouring concrete, forming the front row piles (101) and the rear row piles (102) after the concrete is solidified, arranging a pile top connecting beam (103) template between the front row piles (101) and the rear row piles (102), pouring the concrete into the pile top connecting beam (103) template, and forming the pile top connecting beam (103) after the concrete is solidified;
s3, excavating soft soil to initially form a foundation pit, reserving the soft soil on the side wall of the foundation pit to form a reserved soil slope (8) while excavating the soft soil, wherein the distance between the top of the reserved soil slope (8) and the bottom of the foundation pit is not less than 1/2 of the depth of the foundation pit;
s4, excavating soft soil along the periphery of the reserved soil slope (8) in the foundation pit to form a plurality of pits for accommodating the supporting boxes (3);
s5, horizontally placing the supporting box (3) into the pit, enabling the top of the supporting box (3) to be located outside the pit, backfilling a gap between the supporting box (3) and the pit with soil, compacting, and pouring concrete into the supporting box (3);
s6, sleeving a mounting plate (561) on the inclined strut (4), sleeving a support block (543) on the inclined strut (4), binding the mounting plate (561) and the straight strut (542) on the inclined strut (4), hoisting the inclined strut (4) into a foundation pit, supporting one end of the inclined strut (4) on the front row of piles (101), supporting the other end of the inclined strut (4) on the bottom surface of the support box (3), and hinging the inclined strut (4) on the front row of piles (101);
s7, fixing the second linear driving assembly (55) on the mounting plate (561) through bolts;
s8, uniformly inserting a plurality of auxiliary rods (572) into the reserved soil slope (8), enabling one ends of the auxiliary rods (572) to penetrate through the reserved soil slope (8) and be inserted into soft soil at the bottom of the foundation pit, and enabling the other ends of the auxiliary rods (572) to be located outside the reserved soil slope (8);
s9, hanging the main rod (571) into the foundation pit, fixing one end of the main rod (571) on the side wall of the support box (3), extending the other end of the main rod (571) to the front row of piles (101) along the diagonal brace (4) and abutting against the front row of piles (101), supporting the auxiliary rod (572) on the main rod (571), simultaneously disconnecting the mounting plate (561) from the diagonal brace (4), penetrating the sliding block (562) through the sliding hole (5711), adjusting the position of the mounting plate (561), placing the clamping plate (573) on the supporting plate (6) below the mounting plate (561), and fixing the mounting plate (561);
s10, after the length of the straight supporting column (542) is adjusted, the connecting bolt (58) penetrates through the connecting hole I (54211) and the connecting hole II (54221) and is screwed tightly, so that the auxiliary supporting plate (541) is tightly pressed on the front row of piles (101), and the supporting block (543) is tightly pressed on the inclined supporting column (4);
s11, starting the second linear driving assembly (55) to enable the second linear driving assembly (55) to push the supporting block (543) towards the front row of piles (101);
s12, removing the reserved soil slope (8) and finishing excavation of the foundation pit.
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| CN117947791B (en) * | 2024-03-21 | 2024-05-28 | 天津滨海新区轨道交通投资发展有限公司 | Foundation pit supporting structure and pile pressing device |
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| JP2002227204A (en) * | 2001-01-29 | 2002-08-14 | Maeda Corp | Earth retaining method of excavation section |
| CN106013172A (en) * | 2016-07-01 | 2016-10-12 | 杭州江润科技有限公司 | Double row pile and diagonal brace combined soft soil deep foundation pit supporting structure and construction method |
| CN110820763A (en) * | 2019-11-29 | 2020-02-21 | 兰州理工大学 | Truss type cast-in-situ bored pile supporting method for mucky soil deep foundation pit |
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| JP2002227204A (en) * | 2001-01-29 | 2002-08-14 | Maeda Corp | Earth retaining method of excavation section |
| CN106013172A (en) * | 2016-07-01 | 2016-10-12 | 杭州江润科技有限公司 | Double row pile and diagonal brace combined soft soil deep foundation pit supporting structure and construction method |
| CN110820763A (en) * | 2019-11-29 | 2020-02-21 | 兰州理工大学 | Truss type cast-in-situ bored pile supporting method for mucky soil deep foundation pit |
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