CN113123345B - Collapsible loess area foundation pit excavation supporting structure and process thereof - Google Patents
Collapsible loess area foundation pit excavation supporting structure and process thereof Download PDFInfo
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- CN113123345B CN113123345B CN202110342421.2A CN202110342421A CN113123345B CN 113123345 B CN113123345 B CN 113123345B CN 202110342421 A CN202110342421 A CN 202110342421A CN 113123345 B CN113123345 B CN 113123345B
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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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Abstract
The utility model relates to a collapsible loess area foundation pit excavation supporting structure and a process thereof, belonging to the technical field of foundation pit excavation supporting, comprising drilling piles which are embedded and fixed in the ground, a plurality of drilling piles are arranged, all the drilling piles surround a foundation pit excavation area, each drilling pile is fixedly provided with a bracket, adjacent brackets are all provided with profile steel, the profile steel is abutted against the top surface of the bracket and is abutted against the outer wall of the drilling pile, a positioning block is arranged on the profile steel in a sliding way, the positioning block is positioned on the side wall of the profile steel deviating from the inner wall of the foundation pit, the positioning block slides along the length direction of the profile steel, the positioning block is abutted against the outer wall of the drilling pile, all the profile steels are arranged for a circle along the inner wall of the foundation pit, supporting components are respectively arranged between the profile steels on two opposite side walls of the foundation pit, the end parts of the supporting components are fixedly connected with the profile steels correspondingly close to and abutted against the top surfaces of the brackets, the foundation pit supporting structure is fast in construction, the construction period is saved.
Description
Technical Field
The application relates to the technical field of foundation pit excavation supporting, in particular to a collapsible loess area foundation pit excavation supporting structure and a process thereof.
Background
The collapsible loess is soil which is subjected to significant additional deformation due to structural damage of immersed soil under the action of self-weight stress of an upper soil layer or under the combined action of the self-weight stress and additional stress, and belongs to special soil. Some miscellaneous fill soils also have a collapsibility. Loess widely distributed in northeast, northwest, China and east China has a plurality of collapsibility.
In the existing foundation pit supporting structure, an inner supporting structure is usually of an enclosing purlin structure, and the enclosing purlin is a cross beam arranged at the upper part of a supporting pile and mainly plays a role in keeping the assembled plane shape of a template and connecting the template with a lifting frame into a whole. Commonly used reinforced concrete enclosing purlin is used as a supporting structure for excavation of a foundation pit in a collapsible loess region.
Aiming at the related technologies, the inventor thinks that the reinforced concrete purlin needs maintenance time, and has the defects of long construction period and unsmooth construction.
Disclosure of Invention
In order to achieve the effects of quickly constructing the foundation pit supporting structure and saving the construction period, the application provides the collapsible loess area foundation pit excavation supporting structure and the process thereof.
First aspect, this application provides a collapsible loess regional foundation ditch excavation supporting construction, adopts following technical scheme:
The utility model provides a regional excavation supporting construction of collapsible loess foundation ditch, including bored pile, in bored pile is embedded to be fixed in the ground, bored pile is provided with a plurality ofly, it is regional that all bored piles enclose into the excavation of foundation ditch, every all fixed bracket that is provided with on the bored pile, shaped steel has all been erect on the adjacent bracket, shaped steel and bracket top surface butt, simultaneously with bored pile outer wall butt, it is provided with the locating piece to slide on the shaped steel, the locating piece is located the lateral wall that shaped steel deviates from the foundation ditch inner wall, the locating piece slides along shaped steel length direction, locating piece and bored pile outer wall butt, all shaped steel set up a week along the foundation ditch inner wall, it is just to being provided with supporting component between the shaped steel on the lateral wall to be located the foundation ditch respectively two, supporting component tip and the shaped steel fixed connection that corresponds to be close to and with bracket top surface butt
By adopting the technical scheme, the foundation pit excavation area is determined by the drilled piles, when the foundation pit is excavated, the brackets are fixed on the drilled piles, the profile steels are erected on the brackets, the adjacent profile steels are butted with the inner wall of the foundation pit in a circle in a head-to-tail mode, the positioning blocks are slid to enable the positioning blocks to be butted with the outer wall of the drilled piles, the stability after the reinforced steels are placed is enhanced, the profile steels positioned on two opposite side walls of the foundation pit are horizontally supported by the supporting components, the enclosing purlins formed by the profile steels are erected and supported by the brackets in the vertical direction, and the connectivity of the supporting components and the drilled piles is kept; in the horizontal direction, along shaped steel length direction by locating piece and foundation ditch turn department common spacing, all the other directions carry on spacing fixedly by supporting component cooperation bored concrete pile to shaped steel to the purlin that encloses that makes shaped steel form replaces cement concrete to enclose the purlin and plays the effect that supports the protection to the foundation ditch, does not have the maintenance time, reaches the swift construction of excavation supporting structure, saves construction period's effect.
Optionally, the support assembly comprises a plurality of steel pipes, and the end parts of the adjacent steel pipes are connected through flanges.
Through adopting above-mentioned technical scheme, supporting component adopts a plurality of steel pipes to form through the flange assembly, can make supporting component adapt to different foundation ditch spans, increases supporting component application range, promotes the convenience of use.
Optionally, the supporting component tip is provided with a roll adjustment section of thick bamboo, the roll adjustment section of thick bamboo is located inside the steel pipe, roll adjustment section of thick bamboo outer wall and steel pipe inner wall butt have been seted up on the roll adjustment section of thick bamboo, the rectangular hole is seted up along roll adjustment section of thick bamboo length direction, be provided with loading system between roll adjustment section of thick bamboo and the supporting component, loading system includes pressure components and locking Assembly, pressure components includes the connecting rod, gear and rack, locking Assembly includes hand wheel and gag lever post, gear and rack all are located the roll adjustment section of thick bamboo, the rack is fixed in on the roll adjustment section of thick bamboo inner wall along roll adjustment section of thick bamboo length direction, after running through steel pipe and rectangular hole connecting rod one end with gear fixed connection, wheel and rack meshing, the connecting rod other end is located the steel pipe outside and hand wheel fixed connection, gag lever post one end is inserted with the hand wheel and is inlayed fixedly, the other end is inserted and is inlayed fixedly with the steel pipe.
Through adopting above-mentioned technical scheme, when the setting up of rectangular hole made the relative steel pipe of roll adjustment section of thick bamboo to move, did not take place to obstruct with the connecting rod, rotated the hand wheel, hand wheel drive gear rotates, thereby gear and meshing promote the roll adjustment section of thick bamboo and move to the steel pipe outside, when roll adjustment section of thick bamboo and shaped steel support tightly, inserted the gag lever post with the steel pipe and inlayed, the gag lever post was spacing with the hand wheel during time, avoided the hand wheel gyration, reached and will be located the effect that supporting component both ends shaped steel supported tightly.
Optionally, the stop piece is arranged on the limiting rod and fixed at the end of the limiting rod, two stop pieces are arranged, the stop piece is perpendicular to the limiting rod, and the stop piece cannot penetrate through the hand wheel.
Through adopting above-mentioned technical scheme, setting up of separation blade makes the gag lever post can't break away from the hand wheel, when the hand wheel needs to rotate, to keeping away from the steel pipe and going out the twitch gag lever post, the gag lever post replaces the hand wheel and becomes the stress point, drives the gag lever post and can rotate the hand wheel, has prolonged the arm of force, and is more comfortable and laborsaving when making the rotation hand wheel.
Optionally, the steel pipe is provided with a plurality of positioning holes, the adjacent positioning holes are circularly distributed with the position where the connecting rod penetrates through the steel pipe as a circle center, and the stop piece on the limiting rod, which is close to the positioning hole, is fixedly inserted into the corresponding positioning hole.
By adopting the technical scheme, all the positioning holes form a circle, so that when the hand wheel rotates to a proper position, the nearest positioning hole can be found for limiting and fixing, and convenience is provided for limiting after the distance adjusting cylinder moves.
Optionally, the fixed crown plate that is provided with on the roll adjustment section of thick bamboo, the crown plate is the arc, and the crown plate ring cover is fixed on roll adjustment section of thick bamboo axial outer wall, and the crown plate is close to the lateral wall of shaped steel and the terminal surface coplane that the roll adjustment section of thick bamboo is close to shaped steel with the roll adjustment section of thick bamboo, and when steel pipe and bracket butt, crown plate tip and bracket top surface butt, the crown plate with correspond the shaped steel fixed connection who is close to.
Through adopting above-mentioned technical scheme, the setting of crown plate makes the even moment adjusting section of thick bamboo of supporting component place stability on the bracket in the time, avoids the even phenomenon that the supporting component of moment adjusting section of thick bamboo rolls from the bracket, and the operation when making a moment adjusting section of thick bamboo and shaped steel fixed is more smooth and easy.
Optionally, a ring is arranged on the steel pipe, the ring is sleeved on the outer wall of the steel pipe in the circumferential direction, a reinforcing component is arranged between the ring plate and the ring, the reinforcing component comprises a first reinforcing rod, a second reinforcing rod and a tension rope, one end of the first reinforcing rod is hinged to the ring plate, the other end of the first reinforcing rod is hinged to one end of the second reinforcing rod, which is far away from the first reinforcing rod, is hinged to the ring, the three hinged shafts are horizontally arranged, one end of the tension rope is fixedly connected with the first reinforcing rod, the joint is located at the position, which is close to one end of the second reinforcing rod, of the first reinforcing rod, the other end of the tension rope is fixedly connected with the drilled pile above the ring plate, and the total length of the first reinforcing rod and the second reinforcing rod is greater than the distance from the distance adjusting cylinder to the end of the steel pipe.
By adopting the technical scheme, the arrangement of the ring rings and the matching of the ring plates provide a fixed position for the reinforcing assembly, when an opening of an included angle formed by the first reinforcing rod and the second reinforcing rod is upward, the first reinforcing rod is pulled by the tensile rope, the tensile rope shares the pressure of the bracket, the gravity of the supporting assembly is converted by the tensile rope, so that the ring rings and the ring plates are pushed by the first reinforcing rod and the second reinforcing rod of the first reinforcing rod in the direction away from each other, and the effect that the distance adjusting cylinder is further abutted against the section steel is achieved; when the opening of the included angle formed by the first reinforcing rod and the second reinforcing rod faces downwards, the tensile rope can also play a role in sharing the pressure of the bracket.
Optionally, a positioning piece is arranged on the second reinforcing rod and located at the joint of the second reinforcing rod and the first reinforcing rod, one end of the positioning piece is fixedly connected with the outer wall of the bottom of the second reinforcing rod, and the other end of the positioning piece is arranged in a cantilever mode close to the first reinforcing rod along the length direction of the second reinforcing rod.
Through adopting above-mentioned technical scheme, the setting up of spacer makes the contained angle that first stiffener and second stiffener formed only probably up, makes the effect maximize that the subassembly produced of strengthening.
Optionally, the section steel adopts i-steel, has seted up the spout on the locating piece, and the i-steel pterygoid lamina is located the spout, is provided with the bolt on the locating piece, and the bolt runs through locating piece and i-steel pterygoid lamina butt.
Through adopting above-mentioned technical scheme, the I-steel is construction commonly used and founds, and the facility of drawing materials, and the spout provides convenience for the slip of locating piece, through the bolt fastening, constructor simple operation and understandability.
The second aspect, this application provides a collapsible loess regional foundation ditch excavation supporting construction's construction process, adopts following technical scheme:
a construction process of a collapsible loess area foundation pit excavation supporting structure comprises the following steps:
s1, forming the drilled pile and constructing the crown beam;
S2, removing a road surface in the foundation pit, excavating the foundation pit, and constructing a bracket when excavating to 0.5m below the design position of the profile steel, wherein the design position of the profile steel can be divided into a plurality of parts along the vertical direction;
s3, erecting section steel on the bracket, sliding the positioning block to a proper position and fixing;
s4, hoisting the supporting assembly, operating the pressurizing mechanism to adjust the position of the distance adjusting cylinder and fixing the distance adjusting cylinder;
s5, adjusting the reinforcing component and fixing the tension rope.
Through adopting above-mentioned technical scheme, construction in proper order accords with the construction order from top to bottom to adopt the construction process of multistage layering excavation, carried out multistage bearing structure in vertical direction, further strengthened the stability to excavation supporting.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the supporting component can be adjusted to achieve the effect of being suitable for different foundation pit spans, the supporting component is matched with the profile steel to achieve the effect of quickly supporting the foundation pit, the procedure of enclosing purlin by cement concrete is replaced, and the construction period is saved;
2. the distance adjusting cylinder is matched with the pressurizing mechanism to further tightly support the section steel at two ends of the supporting assembly, so that the supporting effect of the section steel on the drilled pile is enhanced;
3. the setting of strengthening the subassembly has further strengthened the tight degree of supporting of roll adjustment section of thick bamboo to shaped steel, has shared the pressure of bracket simultaneously.
Drawings
FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present application;
FIG. 2 is a schematic view of a portion of a support assembly;
FIG. 3 is a schematic view of a part of the structure of a pressurizing mechanism;
FIG. 4 is a partially enlarged schematic view of portion A of FIG. 2;
FIG. 5 is a schematic view of a portion of a reinforcement assembly.
Description of the reference numerals: 1. drilling a pile; 2. a bracket; 3. section steel; 31. positioning blocks; 311. a chute; 4. a support assembly; 41. a steel pipe; 411. positioning holes; 412. a loop; 5. a distance adjusting cylinder; 51. a strip hole; 52. a ring plate; 6. a pressurizing mechanism; 61. a pressurizing assembly; 611. a connecting rod; 612. a gear; 613. a rack; 62. a locking assembly; 621. a hand wheel; 622. a limiting rod; 7. a baffle plate; 8. a reinforcement assembly; 81. a first reinforcement bar; 82. a second reinforcement bar; 821. positioning plates; 83. a tension rope.
Detailed Description
The present application is described in further detail below with reference to figures 1-5.
The embodiment of the application discloses collapsible loess regional foundation ditch excavation supporting construction.
Referring to fig. 1, bored pile 1 has been filled in the ground, bored pile 1 has been filled a plurality ofly, all bored piles 1 enclose into the foundation ditch excavation region, all fixed bracket 2 that is provided with on every bored pile 1, all erect shaped steel 3 on the adjacent bracket 2, it is provided with supporting component 4 to be located the foundation ditch two just to being provided with between the shaped steel 3 on the pit wall, 4 tip framves of supporting component are established on corresponding shaped steel 3 place's bracket 2, supporting component 4 will be located the foundation ditch two just to supporting tightly shaped steel 3 on the pit wall simultaneously, the purlin that encloses that makes shaped steel 3 form replaces cement concrete to enclose the purlin and plays the effect of supporting the protection to the foundation ditch, there is not maintenance time, reach the swift construction of excavation supporting structure, save construction period's effect.
Referring to fig. 1 and 2, two opposite brackets 2 on the pit wall of the foundation pit are located at the same horizontal elevation, and the brackets 2 on the adjacent pit wall of the foundation pit are located at different horizontal elevations. The section steel 3 is made of I-shaped steel in the embodiment, and the end parts of the section steel 3 are all erected on the bracket 2. Sliding arrangement is provided with locating piece 31 on shaped steel 3, locating piece 31 is provided with two on a shaped steel 3, locating piece 31 slides along shaped steel 3 length direction, locating piece 31 is located shaped steel 3 top, spout 311 has been seted up on locating piece 31, spout 311 is seted up on locating piece 31 bottom surface, spout 311 is seted up and is opened two vertical lateral walls of locating piece 31 along shaped steel 3 length direction, the pterygoid lamina of shaped steel 3 is located spout 311, be provided with the bolt on the locating piece 31, the bolt runs through locating piece 31 and deepens in the spout 311 and with the pterygoid lamina butt, thereby it is fixed with locating piece 31. After the section steel 3 is erected on the bracket 2, the positioning block 31 is slid to make the positioning block 31 abut against the bored pile 1. Two locating pieces 31 are located the both ends of same root shaped steel 3 to with the 1 butt of bored pile that corresponds, strengthened being connected between shaped steel 3 and bored pile 1 and spacing effect each other.
Referring to fig. 1, a supporting component 4 is arranged between two opposite pit walls of the foundation pit, the end portions of the supporting components 4 are erected on corresponding brackets 2, each supporting component 4 comprises a plurality of steel pipes 41, the steel pipes 41 can be cylindrical, and the adjacent steel pipes 41 are connected by flanges end to form the complete supporting component 4, so that the length of each supporting component 4 can be adjusted at any time according to construction conditions.
Referring to fig. 2 and 3, the end portions of the supporting assemblies 4 are provided with distance adjusting cylinders 5, the shapes of the distance adjusting cylinders 5 are cylindrical along with the shapes of the steel pipes 41, the distance adjusting cylinders 5 are located inside the steel pipes 41, the outer walls of the distance adjusting cylinders 5 are abutted to the inner walls of the steel pipes 41, strip holes 51 are formed in the distance adjusting cylinders 5, the strip holes 51 are formed in the length direction of the distance adjusting cylinders 5, pressurizing mechanisms 6 are arranged between the distance adjusting cylinders 5 and the steel pipes 41, and the pressurizing mechanisms 6 are used for moving the distance adjusting cylinders 5 in the length direction of the steel pipes 41 to enable the distance adjusting cylinders 5 to stretch out of the steel pipes 41 and abut against the adjacent section steel 3.
Referring to fig. 3 and 4, the pressing mechanism 6 includes a pressing assembly 61 and a locking assembly 62, the pressing assembly 61 includes a connecting rod 611, a gear 612 and a rack 613, and the locking assembly 62 includes a hand wheel 621 and a limiting rod 622; the gear 612 and the rack 613 are both positioned inside the distance adjusting cylinder 5, one end of the connecting rod 611 sequentially penetrates through the steel pipe 41 and the elongated hole 51 and then is fixedly connected with the gear 612, the rack 613 is fixedly connected with the inner wall of the distance adjusting cylinder 5, the length direction of the rack 613 is arranged along the length direction of the distance adjusting cylinder 5, and the gear 612 is meshed with the rack 613; the other end of the connecting rod 611 is located outside the steel pipe 41 and is fixedly connected with the hand wheel 621, a plurality of positioning holes 411 are formed in the steel pipe 41, and all the positioning holes 411 are distributed in a circular shape with the position, where the connecting rod 611 penetrates through the steel pipe 41, as the center of circle. The gag lever post 622 runs through the setting of hand wheel 621, gag lever post 622 end fixing has separation blade 7, separation blade 7 is provided with two promptly, separation blade 7's setting makes the gag lever post 622 can't break away from hand wheel 621, to keeping away from 41 directions twitching of steel pipe gag lever post 622, thereby the hand wheel 621 is rotated to direct drive gag lever post 622, through gear 612 and rack 613 meshing drive, accomplish the displacement of a roll adjustment section of thick bamboo 5, after hand wheel 621 rotates suitable position, insert the separation blade 7 that is close to 41 one end of steel pipe with gag lever post 622 and inlay in corresponding locating hole 411, accomplish the spacing of hand wheel 621.
Referring to fig. 5, a reinforcing component 8 is arranged between the distance adjusting cylinder 5 and the steel pipe 41, and the reinforcing component 8 is used for sharing the pressure of the bracket 2 and further enabling the distance adjusting cylinder 5 to be tightly abutted against the section steel 3. Be provided with the crown plate 52 on the roll adjustment section of thick bamboo 5, crown plate 52 is arc platelike, crown plate 52 ring cover is on the outer wall of roll adjustment section of thick bamboo 5, crown plate 52 opening is down, crown plate 52 and roll adjustment section of thick bamboo 5 department of contact fixed connection, crown plate 52 tip vertical extension downwards, when roll adjustment section of thick bamboo 5 was placed on bracket 2, crown plate 52 tip and 2 top surfaces butt of bracket, crown plate 52 deviates from the lateral wall of steel pipe 41 and is located the coplanar with the terminal surface that roll adjustment section of thick bamboo 5 deviates from steel pipe 41, crown plate 52 further supports the back with shaped steel 3, can be fixed crown plate 52 with shaped steel 3 through the reinforcing bolt. The outer wall of the steel pipe 41 is fixedly sleeved with a ring 412, the ring 412 is arranged perpendicular to the steel pipe 41, the ring 412 is located close to the end of the steel pipe 41 and is spaced from the end of the steel pipe 41, and the reinforcing assembly 8 is located between the ring plate 52 and the ring 412.
Referring to fig. 5, reinforcing assembly 8 includes first stiffener 81, second stiffener 82 and tensile cord 83, first stiffener 81 one end is articulated with ring plate 52, the other end is articulated with second stiffener 82 one end, second stiffener 82 keeps away from first stiffener 81 one end and articulates with ring 412, and three articulated shafts all set up horizontally, the contained angle opening that forms between first stiffener 81 and the second stiffener 82 is up, second stiffener 82 bottom is provided with locating piece 821, locating piece 821 one end and second stiffener 82 fixed connection, the other end is along second stiffener 82 length direction, set up to encorbelmenting to being close to first stiffener 81, when first stiffener 81 and second stiffener 82 become horizontal state, locating piece 821 strides across first stiffener 81 and second stiffener 82 articulated shaft, make first stiffener 81 and second stiffener 82 unable upward rotation again. Wherein, the total length of the first reinforcing rod 81 and the second reinforcing rod 82 is larger than the distance that the distance adjusting cylinder 5 extends out of the end part of the steel pipe 41. Tensile rope 83 one end and first stiffener 81 top fixed connection, the junction is located and is close to first stiffener 81 and second stiffener 82 articulated shaft department, and the tensile rope 83 other end and the bored pile 1 fixed connection of first stiffener 81 top can adopt reinforcing bolt fixed, and tensile rope 83 can adopt the reinforcing bar rope with fixed mode.
The implementation principle of collapsible loess regional foundation ditch excavation supporting construction of this application embodiment does: excavating a foundation pit to a specified elevation, erecting a bracket 2 on the bored pile 1 after the bored pile 1 leaks out, erecting profile steel 3 on the adjacent bracket 2, sliding a positioning block 31 to enable the positioning block 31 to be abutted against the bored pile 1, fixing the positioning block 31 through a bolt, flange-connecting adjacent steel pipes 41 to enable the whole length of a supporting component 4 to accord with the span of the foundation pit, hoisting the supporting component 4, erecting the steel pipes 41 at the end parts of the supporting component 4 on the corresponding bracket 2, rotating a hand wheel 621 to enable a distance adjusting cylinder 5 to drive a ring plate 52 to tightly support the profile steel 3, inserting a limiting rod 622 into a corresponding positioning hole 411 after adjustment, fixing the ring plate 52 and the profile steel 3 through a reinforcing bolt, fixing one end of a tension rope 83, which is far away from a first reinforcing rod 81, with the bored pile 1 to enable the tension rope 83 to be tightened to complete the supporting of the foundation pit, enabling an enclosing purlin formed by the profile steel 3 to replace a cement concrete enclosing purlin to play a supporting protection role in supporting the foundation pit, the maintenance time is not available, the foundation pit supporting structure is constructed quickly, and the construction period is shortened.
The embodiment of the application also discloses a construction process of the collapsible loess area foundation pit excavation supporting structure.
The method comprises the following steps:
s1, after the drilled pile 1 is formed, picking and chiseling a pile head and performing crown beam construction;
s2, after the maintenance of the top beam is finished, removing the road surface in the foundation pit, excavating the foundation pit, when the excavation is 0.5m below the design position of the section steel 3, constructing the bracket 2, fixing the bracket 2 and the drilled pile 1, wherein the design position of the section steel 3 can be divided into a plurality of positions along the vertical direction, and the embodiment can be divided into four positions, namely the excavation of the foundation pit is divided into five parts;
s3, erecting the section steel 3 on the bracket 2, sliding the positioning block 31 to a proper position and fixing;
s4, hoisting the supporting component 4, operating the pressurizing mechanism 6 to adjust the position of the distance adjusting cylinder 5 and fixing the distance adjusting cylinder 5;
s5, adjusting the reinforcing component 8, fixing the tension rope 83, continuing excavation of the foundation pit after the whole supporting structure of the layer is finished, repeating the step S2 when excavation is carried out to 0.5m below the design position of the next layer of section steel 3, so that four supporting structures are arranged in total in a reciprocating mode, and manually cleaning the groove after the fifth part is excavated.
The implementation principle of the construction process of the collapsible loess area foundation pit excavation supporting structure is as follows: the foundation pit is layered stage by stage in the excavation process, and the excavation of the next layer is carried out after the support of each layer is finished, so that the foundation pit is more stable, the support of the foundation pit is more sufficient, and the safety of foundation pit excavation personnel is protected.
The embodiments of the present invention are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby, so: equivalent changes in structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (7)
1. The utility model provides a regional excavation of foundation ditch supporting construction of collapsible loess, includes bored pile (1), and in bored pile (1) embedded being fixed in the ground, bored pile (1) was provided with a plurality ofly, and all bored piles (1) enclose into the foundation ditch excavation region, its characterized in that: every all be fixed on bored pile (1) and be provided with bracket (2), all erect shaped steel (3) on adjacent bracket (2), shaped steel (3) and bracket (2) top surface butt, simultaneously with bored pile (1) outer wall butt, it is provided with locating piece (31) to slide on shaped steel (3), locating piece (31) are located shaped steel (3) and deviate from the lateral wall of foundation ditch inner wall, locating piece (31) slide along shaped steel (3) length direction, locating piece (31) and bored pile (1) outer wall butt, all shaped steel (3) set up a week along the foundation ditch inner wall, it is provided with supporting component (4) respectively to be located between the shaped steel (3) on the lateral wall just to the foundation ditch two, supporting component (4) tip and shaped steel (3) fixed connection that correspond to be close to and with bracket (2) top surface butt; the end part of the supporting component (4) is provided with a distance adjusting cylinder (5), the distance adjusting cylinder (5) is positioned inside the steel pipe (41), and the outer wall of the distance adjusting cylinder (5) is abutted against the inner wall of the steel pipe (41); the distance adjusting cylinder (5) is fixedly provided with a ring plate (52), the ring plate (52) is an arc-shaped plate, the ring plate (52) is sleeved on the axial outer wall of the distance adjusting cylinder (5) in a ring mode, the side wall, close to the section steel (3), of the ring plate (52) is coplanar with the end face, close to the section steel (3), of the distance adjusting cylinder (5), when the steel pipe (41) abuts against the bracket (2), the end portion of the ring plate (52) abuts against the top face of the bracket (2), and the ring plate (52) is fixedly connected with the section steel (3) which is correspondingly close to; the steel pipe (41) is provided with a ring (412), the ring (412) is annularly sleeved on the circumferential outer wall of the steel pipe (41), a reinforcing component (8) is arranged between the ring plate (52) and the ring (412), the reinforcing component (8) comprises a first reinforcing rod (81), a second reinforcing rod (82) and a tension rope (83), one end of the first reinforcing rod (81) is hinged to the ring plate (52), the other end of the first reinforcing rod is hinged to one end of the second reinforcing rod (82), far away from the first reinforcing rod (81), is hinged to the ring (412), three hinged shafts are arranged horizontally, one end of the tension rope (83) is fixedly connected with the first reinforcing rod (81), the joint is located at the position, close to one end of the second reinforcing rod (82), of the first reinforcing rod (81), the other end of the tension rope (83) is fixedly connected with a bored pile (1) above the ring plate (52), and the total length of the first reinforcing rod (81) and the second reinforcing rod (82) is larger than the distance between the distance adjusting barrel (5) and extending out of the end of the steel pipe (41) (ii) a Be provided with spacer (821) on second stiffener (82), spacer (821) are located second stiffener (82) and first stiffener (81) handing-over department, spacer (821) one end and second stiffener (82) bottom outer wall fixed connection, and the other end is along second stiffener (82) length direction, and the setting of encorbelmenting is located to being close to first stiffener (81).
2. The collapsible loess area foundation pit excavation supporting construction of claim 1, characterized in that: the supporting assembly (4) comprises a plurality of steel pipes (41), and the end parts of the adjacent steel pipes (41) are connected through flanges.
3. The collapsible loess area foundation pit excavation supporting construction of claim 2, characterized in that: the distance adjusting cylinder (5) is provided with a strip hole (51), the strip hole (51) is formed along the length direction of the distance adjusting cylinder (5), a pressurizing mechanism (6) is arranged between the distance adjusting cylinder (5) and the supporting component (4), the pressurizing mechanism (6) comprises a pressurizing component (61) and a locking component (62), the pressurizing component (61) comprises a connecting rod (611), a gear (612) and a rack (613), the locking component (62) comprises a hand wheel (621) and a limiting rod (622), the gear (612) and the rack (613) are both positioned in the distance adjusting cylinder (5), the rack (613) is fixed on the inner wall of the distance adjusting cylinder (5) along the length direction of the distance adjusting cylinder (5), one end of the connecting rod (611) penetrates through the steel pipe (41) and the strip hole (51) and then is fixedly connected with the gear (612), the gear (612) is meshed with the rack (613), the other end of the connecting rod (611) is positioned outside the steel pipe (41) and is fixedly connected with the hand wheel (621), one end of the limiting rod (622) is fixedly inserted into the hand wheel (621), and the other end of the limiting rod is fixedly inserted into the steel pipe (41).
4. The collapsible loess area excavation supporting structure of claim 3, characterized in that: be provided with separation blade (7) on gag lever post (622), separation blade (7) are fixed in gag lever post (622) tip department, and separation blade (7) are provided with two promptly, and separation blade (7) perpendicular gag lever post (622) sets up, and separation blade (7) can't run through hand wheel (621).
5. The collapsible loess area foundation pit excavation supporting structure of claim 4, characterized in that: the steel pipe (41) is provided with a plurality of positioning holes (411), the positioning holes (411) are arranged, the adjacent positioning holes (411) are distributed in a circular shape by taking the position of the connecting rod (611) penetrating through the steel pipe (41) as the center of a circle, and the blocking piece (7) on the limiting rod (622) close to the positioning holes (411) is fixedly inserted into the corresponding positioning holes (411).
6. The collapsible loess area foundation pit excavation supporting structure of claim 1, characterized in that: the section steel (3) is made of I-shaped steel, a sliding groove (311) is formed in the positioning block (31), the I-shaped steel wing plate is located in the sliding groove (311), a bolt is arranged on the positioning block (31), and the bolt penetrates through the positioning block (31) and abuts against the I-shaped steel wing plate.
7. A construction process for applying the collapsible loess area foundation pit excavation supporting structure as set forth in any one of claims 1 to 6, characterized in that: the method comprises the following steps:
s1, forming the drilled pile (1) and constructing the crown beam;
s2, removing a road surface in the foundation pit, excavating the foundation pit, constructing the corbel (2) when the ground is excavated to 0.5m below the design position of the section steel (3), and dividing the design position of the section steel (3) into a plurality of parts along the vertical direction;
s3, erecting the section steel (3) on the bracket (2), and sliding the positioning block (31) to a proper position and fixing;
S4, hoisting the supporting component (4), operating the pressurizing mechanism (6) to adjust the position of the distance adjusting cylinder (5) and fixing the distance adjusting cylinder (5);
s5, adjusting the reinforcing component (8) and fixing the tension rope (83).
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| CN113931195A (en) * | 2021-10-21 | 2022-01-14 | 韶关市鹏成建筑工程有限公司 | Foundation pit supporting structure and construction method thereof |
| CN114059559B (en) * | 2021-12-16 | 2023-05-23 | 陕西建工第十三建设有限公司 | Collapsible loess area foundation pit excavation supporting structure and technology thereof |
| CN114837196B (en) * | 2022-05-26 | 2023-05-02 | 中铁建设集团有限公司 | Active foundation pit supporting device and construction method thereof |
| CN115059092B (en) * | 2022-08-01 | 2023-11-14 | 北京城建八建设发展有限责任公司 | Supporting structure in foundation pit |
| CN115450205B (en) * | 2022-09-24 | 2024-01-26 | 贾龙国 | Construction structure and construction process for inserting pre-stress pipe pile into triaxial stirring pile |
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| KR20040079350A (en) * | 2004-07-28 | 2004-09-14 | 주식회사 한유건설 | Screw mobile jack or construction structures |
| CN204530719U (en) * | 2015-03-17 | 2015-08-05 | 南京水务集团有限公司 | A kind of quick assembled type suspension device for Support of Foundation Pit Excavation |
| CN108086330B (en) * | 2017-12-06 | 2020-06-30 | 中国船舶重工集团应急预警与救援装备股份有限公司 | Rapid supporting device for pipeline emergency repair and using method |
| CN208152051U (en) * | 2018-04-11 | 2018-11-27 | 江苏省地质矿产局第三地质大队 | Foundation pit supporting structure with loose end |
| CN209260723U (en) * | 2018-11-27 | 2019-08-16 | 张利均 | A kind of foundation pit enclosure structure |
| CN210712862U (en) * | 2019-07-15 | 2020-06-09 | 王涛 | Easy dismouting formula underground structure |
| CN110700277A (en) * | 2019-10-28 | 2020-01-17 | 中建三局基础设施建设投资有限公司 | Freely telescopic inner support for covering and digging station construction |
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