CN113622435B - Multistage expansion supporting device and construction method thereof - Google Patents
Multistage expansion supporting device and construction method thereof Download PDFInfo
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- CN113622435B CN113622435B CN202111096044.5A CN202111096044A CN113622435B CN 113622435 B CN113622435 B CN 113622435B CN 202111096044 A CN202111096044 A CN 202111096044A CN 113622435 B CN113622435 B CN 113622435B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
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- Life Sciences & Earth Sciences (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a multistage expansion supporting device which comprises pile rows, steel plates and anchor rods, wherein the pile rows are connected with the steel plates, the anchor rods are connected with the steel plates through anchors, each anchor rod comprises a rod body, tie bars, flexible rods and a displacement blocking device are arranged on the rod body, and the tie bars are pulled to enable the parts, connected with the rod body, of the flexible rods to penetrate through the displacement blocking devices and be clamped with the displacement blocking devices. The invention also discloses a construction method of the multistage expanding support device. For the section seriously affected by the space effect of the foundation pit, the multi-stage expansion supporting device is adopted, and the anchor rod, the row piles and the steel plate in a special structural form are combined to form a whole, so that the supporting rigidity of the enclosure structure can be effectively improved, and the enclosure structure deformation can be better controlled; in the anchor rod pulling construction process, the flexible rod expands, the conical tip body pierces the soil body around the drill hole under the action of the displacement blocking device, and meanwhile, the anchor rod pulling rod can provide larger frictional resistance because the tip of the end part of the rod body is located in the soil body at the bottom of the drill hole.
Description
Technical Field
The invention belongs to a supporting device and a construction method thereof, and particularly relates to a multi-stage expansion supporting device and a construction method thereof.
Background
In recent years, urban construction land is continuously increased, and excavation of deep foundation pits is more and more difficult due to complex geographic positions, construction conditions, irregularity of foundation pits, excavation depth and other uncertain factors. The deep foundation pit is of a three-dimensional space structure and has a space effect characteristic, and a large number of engineering practices prove that the soil pressure and the displacement value in the central range of the pit wall of the deep foundation pit are both larger than those in a certain range of the two pit walls, because the two end walls of the deep foundation pit have obvious space effects, the development of the soil pressure and the displacement in the adjacent areas of the deep foundation pit is inhibited.
Chinese patent with application number CN201610508578.7 discloses a consider soil arch and warp double row pile supporting structure of space effect, be equipped with arch stirring stake stagnant water curtain between front-row fender pile and back-row fender pile, be equipped with reinforced cement soil wall between front-row fender pile and back-row fender pile, be equipped with grid formula stirring stake before the hole, cover connection front-row fender pile and back-row fender pile, constitute the common bearing structure in space, but the problem lies in: the whole width of this supporting construction form is great, and the construction is more complicated, and is comparatively complicated when the design, can produce great economic cost simultaneously.
Chinese patent with application number CN202021119109.4 discloses a double row pile supporting construction, including two rows of campshed, the campshed all sets up the hat beam around, sets up the steel frame roof beam between the hat beam, and the campshed is staggered around and is arranged, sets up simultaneously and connects the web member, sets up the front stall web member between the adjacent pile body of front stall pile to a plurality of space triangle truss column structures have been formed between the front stall pile, but the problem lies in: although the supporting mode adopts a plurality of rows of piles and connects the rows of piles, the lateral rigidity of the supporting structure is simply increased, the main stress direction of the soil body deflects along with the excavation of the soil body in the pit, the soil body outside the enclosure structure tends to move towards the inside of the pit, at the moment, the supporting structure cannot provide more force to resist deformation, meanwhile, the form of the supporting structure is too complex, and too many web members can increase economy.
Generally speaking, the prior art can not fully consider the space effect of foundation ditch, can not realize carrying out the effect of secondary enhancement to supporting construction through simple operation. Although the middle displacement of the pit wall of the foundation pit can not be overlarge to a certain extent by the existing supporting mode, the problem that the horizontal displacement of the enclosure structure near the excavation surface of the foundation pit is the largest is still not solved.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects of the prior art, the invention aims to provide the multistage expansion supporting device with high supporting rigidity and adjustable frictional resistance, and the invention also aims to provide the construction method of the multistage expansion supporting device with simple construction, energy conservation and environmental protection.
The technical scheme is as follows: the invention relates to a multistage expansion supporting device which comprises row piles, steel plates and anchor rods, wherein the row piles are connected with the steel plates through concrete to form a row pile-steel plate enclosure wall, the anchor rods are connected with the steel plates through anchors, each anchor rod comprises a rod body, tie bars, flexible rods and displacement blocking devices are arranged on the rod body, and the tie bars can be pulled to enable the parts, connected with the rod body, of the flexible rods to penetrate through the displacement blocking devices and be clamped with the displacement blocking devices. Due to the action of the rigidity of the steel plate, the pile spacing can be properly increased and the using amount of the piles is reduced during the design calculation of the row piles.
Further, the displacement blocking device comprises a tip portion, a first transition section, a first circular table portion, a second transition section, a second circular table portion and a third transition section which are sequentially connected, and the diameters of the first transition section, the second transition section and the third transition section are gradually increased. The maximum circumference diameter of the tip part is larger than the diameter of the first transition section, the maximum circumference diameter of the first circular table part is larger than the diameter of the second transition section, and the maximum circumference diameter of the second circular table part is larger than the diameter of the third transition section.
Further, the one end that the body of rod kept away from the steel sheet sets up the pointed end, and the pointed end inserts the soil body, can increase the body of rod to the side frictional resistance of this place soil body.
Furthermore, the end of the flexible rod far away from the rod body is provided with a cone tip body, and the tie bar is used for enabling the cone tip body to be reversely inserted into a soil body. The included angle between the cone tip body and the rod body is 30-60 degrees. The cone point body is connected with the flexible rod through a hoop and is made of metal materials. The number of the flexible rods, the tie bars and the hoops is equal. Under the condition that the rod body is kept motionless, an outward pulling force is applied to the tie bar, the flexible rod can expand under the action of the displacement blocking device, so that the cone tip body expands outwards to pierce the soil body around the drill hole, and meanwhile, due to the action of the displacement blocking device and the tie bar, the cone tip body cannot generate overlarge displacement.
Furthermore, the flexible rods are uniformly distributed at intervals along the circumferential direction of the rod body, and the plurality of flexible rods are connected through connecting rings. When the soil body around the foundation pit tends to move towards the inside of the pit, the foundation pit supporting device consisting of the anchor rods, the row piles and the steel plates can effectively control the deformation problem of the foundation pit better, the process of constructing the top beams in the conventional foundation pit supporting can be omitted, the anchor rods in a special structural form are combined with the row piles and the top beams, and the rigidity of the whole supporting structure of the foundation pit can be improved.
The construction method of the multistage expansion supporting device comprises the following steps:
arranging row piles and steel plates at the side line of a foundation pit;
step two, after excavating to an excavation surface and overetching for 0.5-1 m, preferably for 0.5m, positioning, drilling and cleaning holes on a steel plate;
step three, placing the anchor rod into the drill hole, keeping the anchor rod still after ensuring that the anchor rod is inserted into soil mass at the bottom of the drill hole, and applying tension to the tie bars to enable the flexible rods to be inserted into the soil mass around the drill hole;
fixing the tension anchor rod on the steel plate through an anchorage device;
and step five, monitoring, and when the strain exceeds a preset alarm value, tensioning the tie bar again to clamp the flexible rod at the next position of the displacement blocking device, so that the flexible rod is inserted into the soil at a larger angle, and the effect of multistage expansion is achieved.
The working principle is as follows: the row piles are connected with the steel plates through concrete, and the function of the anchor rod is matched to form a whole support. The anchor rod is inserted into the soil body at the bottom of the drilled hole to provide certain frictional resistance, and the other end of the anchor rod is connected with the steel plate under the action of the anchor device, so that the anchor rod, the drilled hole and the steel plate are integrated, and the supporting rigidity can be greatly improved.
The arrangement position of the anchor rod is determined according to the position of the excavation surface. Considering that the maximum value of the horizontal displacement of the enclosure structure generally appears near the excavation surface in the foundation pit engineering, after the enclosure structure is excavated to the excavation surface and is over-excavated by 0.5-1 m, the anchor rod is constructed at the excavation surface, so that the function of the supporting structure can be exerted to a greater extent.
Through applying outside pulling force to the drawknot muscle, make flexible rod take place the expansion deformation under displacement blocking device's effect to reach the effect that the awl point body pierces the soil body around the drilling, simultaneously because there is the pulling force of displacement blocking device and drawknot muscle again, can avoid the awl point body to drilling bottom direction reverse movement, the condition that can't provide frictional resistance takes place. The tie bar is fixed through the anchorage device, and the tension can be maintained.
In the monitoring process of later stage to supporting construction deformation, reach or when closing on the alarm value of settlement when the monitoring warp, through applying the pulling force once more to the drawknot muscle, make flexible pole further expansion, the awl point can be enough darker the soil body of pricking, provides bigger supporting counter-force, reaches the secondary and consolidates, ensures overall structure safety's effect.
Has the advantages that: compared with the prior art, the invention has the following remarkable characteristics:
1. for the section seriously affected by the space effect of the foundation pit, a multistage expansion supporting device is adopted, and a pull anchor rod, a row pile and a steel plate in a special structural form are combined to form a whole, so that the supporting rigidity of the enclosure structure can be effectively improved, and the enclosure structure can be better controlled to deform;
2. in the construction process of the anchor rod pulling, the flexible rod is expanded, the conical tip body is enabled to pierce into soil around the drill hole under the action of the displacement blocking device, and meanwhile, the tip end of the rod body is located in the soil at the bottom of the drill hole, so that the anchor rod pulling can provide larger frictional resistance;
3. the steel plates are arranged to connect the row piles together, and meanwhile, due to the existence of the anchor rods, the enclosure structure can be provided with larger deformation resistance, so that compared with a conventional row pile wall supporting structure, the step and the cost for constructing the crown beam are saved, larger supporting acting force can be provided, and the whole supporting structure is safer;
4. in the excavation process of the foundation pit, a pulling anchor rod with the length of 0.5-1 m is over-excavated at the excavation surface every time, so that the horizontal deformation of the enclosure structure can be effectively inhibited;
5. multistage expansion supporting device can ensure to carry out many times reinforcement to the slope body when later stage soil body warp too big, improves overall structure's stability, security.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic structural view of the anchor rod 3 in a non-working state;
fig. 3 is a structural schematic diagram of the anchor rod 3 in a working state;
FIG. 4 is a schematic view of the structure of the clamp 5 of the present invention;
fig. 5 is a semi-perspective view of the displacement blocking device 34 of the present invention.
Detailed Description
As shown in fig. 1, the multi-stage expansion supporting device comprises row piles 1, steel plates 2, anchor rods 3 and anchors 4, wherein the row piles 1 are connected with the steel plates 2 to form a foundation pit enclosure wall, the anchor rods 3 are fixed on the steel plates 2 through the anchors 4, and the formed foundation pit enclosure structure can have larger supporting rigidity to resist the action of external force, so that the horizontal displacement of the enclosure structure is reduced, and the safety of foundation pit engineering is ensured.
As shown in fig. 2 to 4, the tie-bolt rod 3 includes a rod body 31, a tie bar 32, a flexible rod 33, a displacement blocking device 34, a tip 35 and a cone 36. The end part of the rod body 31 far away from the steel plate 2 is provided with a tip 35, and the conical tip body 36 is made of metal materials and is connected with the flexible rod 33 through a clamp 5. The included angle between the cone tip body 36 and the rod body 31 is 30-60 degrees. The flexible rods 33 are uniformly spaced along the circumference of the rod body 31, and a plurality of flexible rods 33 are connected by connecting rings. The flexible rod 33 is sleeved with the rod body 31 and can move freely relative to the rod body, when the rod body 31 is conveyed into a drill hole, the tip 35 is ensured to be partially penetrated into soil at the bottom of the drill hole, and at the moment, the tip 35 can generate certain frictional resistance with the soil. Keep the body of rod 31 motionless, exert the outside pulling force of drilling to the drawknot muscle 32, make flexible rod 33 drive the awl point body 36 and produce relative motion with the body of rod 31, simultaneously under the effect of displacement blocking device 34, flexible rod 33 produces the expansion and makes the awl point body 36 can effectively pierce the soil body around the drilling, further increase whole anchor rod 3's resistance, simultaneously because the effect of displacement blocking device 34 and drawknot muscle 32, anchor rod 3 inside can not produce great relative motion. The number of flexible rods 33, tie bars 32 and clips 5 is equal.
And because the soil body excavation unloading in the foundation pit, the main stress direction of soil deflects, and the soil body outside the enclosure structure tends to move towards the inner side of the foundation pit, but the cone tip body 36 can better play a role at the moment, so that the rigidity of the whole supporting structure can be further improved, and the horizontal displacement generated by the enclosure structure is reduced. The arrangement position of the anchor rod 3 is determined according to the position of the excavation surface of the foundation pit, so that the problem that the horizontal displacement of the enclosure structure is the largest at the excavation surface of the foundation pit can be effectively solved, and the risk of instability of the enclosure structure of foundation pit engineering is reduced. In addition, in order to guarantee foundation ditch engineering's safety, reply supporting construction and carry out periodic monitoring, when monitoring deformation value reachd or close on the alarm value of setting for, reply lacing wire 32 and apply bigger pulling force for flexible rod 33 passes bigger displacement blocking device 34, and further expansion makes the more dark better and soil body contact of awl point body 36, increases the resistance, improves supporting construction's withdrawal resistance, guarantees foundation ditch engineering's safety and stability.
As shown in fig. 5, the displacement blocking means 34 includes a tip portion 341, a first transition section 342, a first circular table portion 343, a second transition section 344, a second circular table portion 345 and a third transition section 346 connected in sequence, and the diameters of the first transition section 342, the second transition section 344 and the third transition section 346 are gradually increased. The tip portion 341 has a maximum circumferential diameter larger than the diameter of the first transition section 342, the first boss portion 343 has a maximum circumferential diameter larger than the diameter of the second transition section 344, and the second boss portion 345 has a maximum circumferential diameter larger than the diameter of the third transition section 346. When the flexible rod 33 is clamped in the first transition section 342, the included angle between the conical tip body 36 and the rod body 31 is 30 degrees; when the flexible rod 33 is clamped at the second transition section 344, the included angle between the conical tip 36 and the rod body 31 is 45 degrees; when the flexible rod 33 is caught in the third transition section 346, the angle between the conical tip 36 and the rod body 31 is 60 °.
The construction method of the foundation pit supporting structure comprises the following steps:
arranging a row pile 1 and a steel plate 2 at the side line of a foundation pit;
step two, after excavating to an excavation surface and overetching for 0.5-1 m, positioning on the steel plate 2, and drilling and cleaning holes;
step three, the anchor rod 3 is placed into the drill hole, the rod body 31 is kept still after the tip 35 is ensured to be inserted into the soil body at the bottom of the drill hole, and the cone tip body 36 is enabled to be penetrated into the soil body around the drill hole under the action of the pulling force, the flexible rod 33 and the displacement blocking device 34 by applying the pulling force to the tie bar 32;
fixing the whole anchor rod 3 on the steel plate 2 through an anchorage device 4;
and step five, monitoring the supporting structure in the later stage, and when the strain exceeds a preset alarm value, tensioning the tie bar 32 again to enable the cone tip body 36 to further penetrate into the soil, so that the effect of multistage expansion is achieved.
Claims (6)
1. The utility model provides a multistage expansion supporting device which characterized in that: the pile row pile pulling device comprises a pile row (1), a steel plate (2) and a pulling anchor rod (3), wherein the pile row (1) is connected with the steel plate (2), the pulling anchor rod (3) is connected with the steel plate (2) through an anchorage device (4), the pulling anchor rod (3) comprises a rod body (31), a tie bar (32), a flexible rod (33) and a displacement blocking device (34) are arranged on the rod body (31), and the flexible rod (33) and the rod body (31) can penetrate through the displacement blocking device (34) and be clamped with the displacement blocking device by pulling the tie bar (32);
the displacement blocking device (34) comprises a tip part (341), a first transition section (342), a first circular truncated cone part (343), a second transition section (344), a second circular truncated cone part (345) and a third transition section (346) which are connected in sequence, and the diameters of the first transition section (342), the second transition section (344) and the third transition section (346) are gradually increased;
the maximum circumferential diameter of the tip portion (341) is larger than the diameter of the first transition section (342), the maximum circumferential diameter of the first boss portion (343) is larger than the diameter of the second transition section (344), and the maximum circumferential diameter of the second boss portion (345) is larger than the diameter of the third transition section (346);
one end of the flexible rod (33) far away from the rod body (31) is provided with a cone tip body (36), and the tie bar (32) is used for enabling the cone tip body (36) to be reversely inserted into a soil body; the included angle between the cone tip body (36) and the rod body (31) is 30-60 degrees.
2. The multi-stage expandable support device of claim 1, wherein: one end of the rod body (31) far away from the steel plate is provided with a tip (35), and the tip (35) is inserted into a soil body.
3. The multi-stage expandable support device of claim 1, wherein: the cone tip body (36) is connected with the flexible rod (33) through a hoop (5).
4. A multi-stage expandable support device according to claim 3, wherein: the number of the flexible rods (33), the tie bars (32) and the clamps (5) is equal.
5. The multi-stage expandable support device of claim 1, wherein: the flexible rods (33) are uniformly distributed at intervals along the circumferential direction of the rod body (31), and the flexible rods (33) are connected through connecting rings.
6. The construction method of a multistage expansion supporting device according to claim 1, comprising the steps of:
firstly, arranging row piles (1) and steel plates (2) at the side line of a foundation pit;
step two, after excavating to an excavation surface and overetching for 0.5 to 1m, positioning, drilling and cleaning holes on the steel plate (2);
step three, the anchor rod (3) is placed into the drilled hole, the rod body (31) is kept still after the rod body (31) is inserted into soil at the bottom of the drilled hole, and the flexible rod (33) is inserted into the soil around the drilled hole by applying pulling force to the tie bar;
fixing the anchor rod (3) on the steel plate (2) through an anchorage device (4);
and step five, monitoring, when the strain exceeds a preset alarm value, tensioning the tie bar (32) again to enable the flexible rod (33) to be clamped at the next position of the displacement blocking device (34) and to be inserted into the soil at a larger angle.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111096044.5A CN113622435B (en) | 2021-09-17 | 2021-09-17 | Multistage expansion supporting device and construction method thereof |
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| CN202111096044.5A CN113622435B (en) | 2021-09-17 | 2021-09-17 | Multistage expansion supporting device and construction method thereof |
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| CN113622435A CN113622435A (en) | 2021-11-09 |
| CN113622435B true CN113622435B (en) | 2023-02-28 |
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| CN114673186B (en) * | 2022-04-25 | 2023-09-22 | 华煜建设集团有限公司 | TRD construction method pile waterproof curtain for penetrating round gravel layer |
| CN114892675B (en) * | 2022-05-30 | 2024-03-26 | 文华工程咨询股份有限公司 | Foundation pit supporting structure with function of measuring foundation pit construction parameters |
Citations (4)
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| CN1332296A (en) * | 2001-08-16 | 2002-01-23 | 吕怀民 | Construction process of retaining wall with inner anchoring wall |
| CN107059882A (en) * | 2017-04-17 | 2017-08-18 | 燕山大学 | Arch anchor net and Anchor-Pile Retaining Structure structure |
| CN113047881A (en) * | 2021-05-07 | 2021-06-29 | 南京博联特光电科技有限公司 | GFRP intelligent combined anchor rod suitable for subway tunnel support and construction method |
| CN113136875A (en) * | 2021-04-29 | 2021-07-20 | 江苏科技大学 | Foundation pit supporting structure and construction method thereof |
-
2021
- 2021-09-17 CN CN202111096044.5A patent/CN113622435B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1332296A (en) * | 2001-08-16 | 2002-01-23 | 吕怀民 | Construction process of retaining wall with inner anchoring wall |
| CN107059882A (en) * | 2017-04-17 | 2017-08-18 | 燕山大学 | Arch anchor net and Anchor-Pile Retaining Structure structure |
| CN113136875A (en) * | 2021-04-29 | 2021-07-20 | 江苏科技大学 | Foundation pit supporting structure and construction method thereof |
| CN113047881A (en) * | 2021-05-07 | 2021-06-29 | 南京博联特光电科技有限公司 | GFRP intelligent combined anchor rod suitable for subway tunnel support and construction method |
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