CN111733894A - Anti-floating system of deep foundation pit underground structure and construction process - Google Patents
Anti-floating system of deep foundation pit underground structure and construction process Download PDFInfo
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- CN111733894A CN111733894A CN202010521971.6A CN202010521971A CN111733894A CN 111733894 A CN111733894 A CN 111733894A CN 202010521971 A CN202010521971 A CN 202010521971A CN 111733894 A CN111733894 A CN 111733894A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/10—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against soil pressure or hydraulic pressure
- E02D31/12—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against soil pressure or hydraulic pressure against upward hydraulic pressure
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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
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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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
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
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- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
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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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Abstract
The invention relates to an anti-floating system of an underground structure of a deep foundation pit and a construction process, which comprises anchor pulling piles, a net spraying structure arranged between the anchor pulling piles and a U-shaped water guiding groove arranged at the end of the anchor pulling piles, wherein a water drain pipe is arranged on the net spraying structure and penetrates through a soil body, so that water is guided to the U-shaped water guiding groove through the water drain pipe and is collected to a water collecting well for pumping and drainage along the water guiding groove; waterproof layers are arranged at the bottoms of the anchor pulling piles and the raft, one end of a water stop screw is anchored on the anchor pulling piles or is sprayed on a soil body through a net, the bottom plate is connected with the anchor pulling piles, and the side wall plate is also connected with the anchor pulling piles. The method effectively enhances the anti-floating capacity, reduces the damage possibility of the bottom plate and the side wall plate, avoids the narrow backfill construction and the template construction of the space at the outer side of the side wall plate, avoids the waste of the supporting structure, reduces the earthwork excavation and the side modulus, reduces the temporary one-time investment of the supporting structure, and better controls and solves the problems of narrow construction space outside the side wall, insufficient structure pulling resistance, excessive side wall water pressure expansion crack damage and the like.
Description
Technical Field
The invention relates to the technical field of underground structure anti-floating, in particular to an anti-floating system of an underground structure of a deep foundation pit and a construction process, which realize that a deep foundation pit supporting structure adopts an anti-floating anchor rod as an anchor rope for drawknot to stabilize the foundation pit, and simultaneously connect the anti-floating anchor rod with a side wall plate, thereby enhancing the anti-floating capacity and effect, reducing earthwork excavation, side modulus and temporary one-time investment of the supporting structure, and greatly reducing the construction cost.
Background
In underground structure engineering such as deep foundation pit basement, underground sewage treatment plant, because the ground water level is high, it is big to receive the rainy season influence, often need do anti floating consideration, nevertheless discover in actual construction, receive cost and design professional restriction, often need face following problem:
(1) the underground structure is close to the deep foundation pit support pile structure, the construction space is narrow, the backfill quality cannot be guaranteed, or expensive materials such as sand inclusion stones, plain concrete, modified soil and the like are required to be used for backfill.
(2) When the side wall plate of the underground structure is large and thin and insufficient in reinforcing bars, the water level rises under the conditions of rainy season and the like, and the side wall plate is large in water pressure, bent and deformed and easily subjected to expansion cracking and water leakage.
(3) Aiming at the anchor pulling pile supporting structure, the temporary support has high input cost, is considered too little as a subsequent permanent use structure, and has low economic applicability.
(4) Aiming at a deep foundation pit, an underground structure is only tied by an anti-floating anchor rod arranged on a floor, is influenced by fluctuation of water level, causes certain drawing fatigue damage to a bottom plate, even cracks bottom plate concrete, and has great influence on anti-floating stability of the structure.
(5) The formwork erecting construction space of the outer wall of the underground structure is narrow, formwork erecting operation and waterproof construction are difficult, and the construction cost can be greatly increased.
Disclosure of Invention
The technical problem of the invention is mainly solved by the following technical scheme:
an anti-floating system of an underground structure of a deep foundation pit is characterized by comprising anchor pulling piles, a net-spraying structure arranged between the anchor pulling piles and a U-shaped water guiding groove arranged at the end of the anchor pulling pile, wherein a water drain pipe is arranged on the net-spraying structure and penetrates through a soil body, so that water is guided to the U-shaped water guiding groove through the water drain pipe and is collected to a water collecting well for pumping and drainage along the water guiding groove; waterproof layers are arranged at the bottoms of the anchor pulling piles and the raft plates, one end of a water stop screw is anchored on the anchor pulling piles or sprayed on a soil body through a net, the bottom plate is connected with the anchor pulling piles, the side wall plate is also connected with the anchor pulling piles, the water stop screw further comprises a water permeable pipe and a water sealing leveling layer, the water permeable pipe is arranged along the bottom of the foundation pit support pile and is arranged at a position 30-50cm below the base, capillary broken stones are adopted to fill the periphery of the water permeable pipe, the diameter is 20-30cm, and a grouting pipe is arranged at the top in the pipe; the thickness of the water sealing leveling layer is flush with the inner vertical surface of the crown beam, the water sealing leveling layer is arranged on the outer layer of the vertical surface net spraying structure outside the support pile, the waterproof non-sticky surface of the waterproof layer is adhered with the surface of the water sealing leveling layer by adopting a vertical brushing adhesive line, and the sticky surfaces face the side wall plate side.
The invention creatively:
1) the anchor pulling structure of the anchor pulling pile adopts the anti-floating anchor pile, and the temporary supporting structure is reasonably combined with the permanent structure, so that the use efficiency of the supporting structure is effectively improved, and the cost and the time delay are reduced;
2) the anti-floating anchor rods are added on the side wall plate, so that the side wall plate can be pulled and tied by the anti-floating anchor rod piles to offset lateral stress when being subjected to strong lateral water pressure, and the anti-floating performance of the whole underground structure in the deep foundation pit is enhanced;
3) the anchor pulling pile structure is in direct contact with an underground structure, so that the earth excavation amount and the backfill amount between two originally designed structures are reduced, and the construction of a formwork and an outer scaffold of the outer vertical surface of the side wall can be reduced.
In the anti-floating system of deep foundation pit underground structure, the anchor pulling pile comprises a support pile, a crown beam and an anti-floating anchor rod, the anti-floating anchor rod adopts an anchor plate to anchor the anti-floating anchor rod on the support pile, the anchor plate and the anti-floating anchor rod are welded during the anchor pulling test of the anti-floating anchor rod, and the crown beam is arranged at the top end of the support pile to be connected with the support pile.
In foretell deep basal pit underground structures anti floating system, the net spouts the structure setting between the fender pile, and the net spouts the structure and adopts the bar planting anchoring with the fender pile, and the net spouts the thickening of structure and spouts the thick liquid and make its survey surface and pile body parallel and level.
In foretell deep basal pit underground structures anti-floating system, the U type guiding gutter is laid on anti-floating anchor rod end and is pressed close to a fender pile, and the waterproof layer sets up in fender pile surface and raft bottom, and stagnant water screw rod one end anchor is on a fender pile or wear the net to spout in the soil body, and the bottom plate is connected with anti-floating anchor rod, and the side wall board also is connected with the anti-floating anchor rod of anchor on a fender pile.
In the anti-floating system of the deep foundation pit underground structure, the waterproof layer is made of SBS modified asphalt coiled materials, the double layers are paved and pasted and arranged between the support piles and the side wall plate, and the side wall concrete layer is poured after the surface of the support piles are paved and pasted.
A construction process of an anti-floating system of an underground structure of a deep foundation pit is characterized by comprising the following steps:
step 1, supporting piles and crown beam construction: preparing materials according to requirements, accurately measuring and setting out the pile position of a support pile, constructing the support pile and the crown beam according to design requirements, and performing next procedure construction after the support pile and the crown beam are detected to be qualified;
step 2, earthwork, net spraying structure and anti-floating anchor rod construction: carrying out earth excavation while carrying out net-spraying structure and anti-floating anchor rod construction until the bottom elevation of the foundation pit is reached; wherein the mesh spraying structure is subjected to one-time binding and installation of the reinforcing steel bar mesh pieces and mesh sand-blasting slurry construction after the earth excavation depth is 3-5 m; the anti-floating anchor rod is subjected to pore-forming construction after earth is excavated to the elevation, an anti-pulling force test is carried out after the strength meets the requirement, an anchor plate is sleeved on an anchor rod reinforcing steel bar before the test, and the anchor plate is tightly attached to a support pile for welding and anchoring after the test is carried out to an index value by pulling; the U-shaped water guide groove is installed before the anti-floating anchor rod construction and the net sand blasting slurry are completed, and the net sand blasting slurry is ensured to fill a gap between the U-shaped water guide groove and the side wall of the supporting structure;
step 3, constructing a foundation anti-floating anchor rod and a water permeable pipe: digging a groove at the pile bottom edge of the support pile with the distance of 20-50cm, embedding a water permeable pipe, and filling by adopting capillary macadam; meanwhile, constructing a foundation anti-floating anchor rod pile;
and 4, constructing a cushion layer, a waterproof layer and a bottom plate: after the anti-floating anchor rod construction and detection, sequentially performing cushion layer, waterproof, protective layer, bottom plate steel bar binding, side wall and bottom plate post-cast strip water-stop steel plate and concrete construction; the construction method comprises the following steps of constructing an outer side wall of a structure in a waterproof manner, firstly performing water sealing leveling layer construction on a bottom section of the side wall of a support pile and placing a water-stopping steel plate section at the bottom, wherein a waterproof non-sticky surface is bonded with the surface of the water sealing leveling layer by adopting a vertical brushing adhesive line, the brushing position is required to avoid plugging a water outlet, sticky surfaces face the side wall plate, and a sticky surface protective layer is torn off from a coiled material before concrete pouring;
step 5, sealing the water leveling layer, sealing the water screw rod and performing waterproof construction: the outer side face formed by the support piles is subjected to water sealing and leveling layer construction according to the construction section of the side wall of the basement in a layered mode, the U-shaped water guide groove is removed while construction is carried out, after the strength of the water sealing and leveling layer reaches 75% of the strength of concrete of the water sealing and leveling layer, holes are drilled between the pile body and the piles according to the design of measuring and calculating intervals, anchoring construction of the anti-pulling water stop screw rods and the bar planting water stop screw rods is carried out, the anti-pulling water stop screw rods are inserted after hole grouting is carried out, and the bar planting water stop screw rods are inserted after; then, performing waterproof construction, wherein a waterproof non-sticky surface is adhered to the surface of the water sealing leveling layer by adopting a vertical brushing adhesive line, a brushing position is required to avoid blocking a water outlet, the side wall water flows to a base screw to be guided out through an insertion pipe, sticky surfaces face the side wall plate, and a sticky surface protection layer is torn off from a coiled material before concrete pouring;
step 6, side wall plate construction: binding the reinforcing steel bars of the side wall plate, and installing and reinforcing the inner side film; and (4) extracting the insertion pipe at the base screw, plugging the opening of the insertion pipe and immediately pouring concrete on the side wall plate.
Therefore, the invention has the following advantages: the invention reasonably adds the side wall anti-floating structure to the structures such as basement, sewage plant and the like in the deep foundation pit with the support piles, and is embodied in the following concrete steps:
(1) the underground structure side wall structure is directly connected with the deep foundation pit anchoring pile supporting structure, so that an external scaffold is effectively saved, the backfill of a narrow space is avoided, the risk of uneven settlement of gaps among structures is guaranteed, and the cost is greatly saved.
(2) The supporting pile anchor pulling structure adopts the anti-floating anchor rods, the anti-floating anchor rods are used for obliquely pulling the side walls, the side walls can be pulled firmly, the anti-floating effect is achieved, the damage possibility of the bottom plate and the side wall plate is reduced, narrow backfill construction and formwork construction of the outer side space of the side wall plate are avoided, deformation of the side wall plate is effectively avoided, and the anti-floating performance of a structure is enhanced.
(3) This structure combines together the temporary support effect and the permanent anchor structure of drawing anchor pile supporting construction, improves supporting construction's use utility, effective reduce cost and time delay.
(4) Practice thrift the template of side wall board with draw anchor pile contact surface, the stagnant water screw rod has one end to set up the anchor section, makes stagnant water screw rod stable anchoring at pile body or soil body, forms stable anchor structure that draws, simple and practical easy operation practices thrift the cost greatly.
(5) Aiming at precipitation, a water permeable pipe is embedded at the bottom of the edge of the foundation pit to form a pit bottom precipitation structure; a U-shaped water guiding groove is arranged at the joint of the anti-floating anchor rod on the anchor pulling pile, and the seepage water on the side wall is guided to the construction excrement channel and discharged from the water collecting well, so that a stable water descending and discharging system is formed.
Drawings
Figure 1 is a cross-sectional view of the inventive foundation pit support structure.
Fig. 2 is a cross-sectional view of the anti-floating structure of the present invention.
Fig. 3 is a schematic structural diagram of the foundation pit anchor structure of the invention.
Fig. 4 is a schematic view of the anti-floating structure of the present invention.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
Example (b):
the invention discloses an anti-floating system of an underground structure of a deep foundation pit, which comprises an anti-floating anchor rod, an anchor plate, a support pile, a crown beam, a net spray, a water drain pipe, a U-shaped water guide groove, a waterproof and water-sealing leveling layer, a water permeable pipe, a water stop screw rod, a bottom plate, a side wall plate and the like. The structure adopts an anti-floating anchor rod as a pulling anchor structure of a pulling anchor pile, the anti-floating anchor rod is anchored on a support pile by adopting an anchor plate, the anchor plate and the anti-floating anchor rod are welded during the pulling anchor test of the anti-floating anchor rod, and a crown beam is arranged at the top end of the support pile to be connected with the support pile; the net spraying structure is arranged between the supporting piles, the net spraying structure and the supporting piles are anchored in a bar planting mode, the net spraying needs thickening and guniting to enable the measuring surface of the net spraying structure to be flush with the pile body, and manual trowelling is carried out; the U-shaped water guiding groove is arranged on the end head of the anti-floating anchor rod and is close to the support pile, the drain pipe is arranged on the net spraying structure and penetrates through the soil body, so that water is guided to the U-shaped water guiding groove through the drain pipe and is collected to the water collecting well along the water guiding groove for pumping and draining; waterproof setting is in supporting construction surface and raft bottom, and stagnant water screw rod one end anchor is on a fender pile or wear the net to spout in the soil body, and the bottom plate is connected with anti-floating anchor, and the lateral wall board also is connected with the anti-floating anchor of anchor on a fender pile, forms stable, safe and reliable's deep basal pit underground structures anti-floating structure. Meanwhile, the invention also discloses a construction method applied to the structure system, which comprises the following specific steps: a. constructing a supporting pile and a crown beam; b. constructing earthwork, net spraying and anti-floating anchor rods; c. constructing a foundation anti-floating anchor rod and a water permeable pipe; d. constructing a cushion layer, a waterproof layer and a bottom plate; e. sealing a water leveling layer, sealing a water screw rod and performing waterproof construction; f. and (5) constructing the side wall plate. This anti use of structure that floats, increase anti floating anchor structure at the side wall, effectively strengthen anti floating ability, reduce the destruction possibility of bottom plate and side wall board, avoid the narrow construction and the template construction of backfilling of side wall board outside face side space, reduce earthwork excavation and side modulus and supporting construction and once drop into temporarily, make the outside construction space of side wall narrow, the structure withdrawal resistance is not enough, the too big spalling of side wall water pressure destroys scheduling problem obtains better control and solution, have structure safety and stability, construction process is simpler, the cost is practiced thrift more, have more characteristics such as low energy high efficiency.
The utility model provides an anti structure that floats of deep basal pit underground structure which characterized in that:
(1) the anchor pulling pile comprises a support pile, a crown beam and an anti-floating anchor rod, wherein the anti-floating anchor rod is adopted as an anchor pulling structure, the distance and angle setting of the anchor pulling pile needs to consider the stress of the support construction stage and the stress of the anti-floating anchor pulling stage, and the final selection is based on the maximum design, wherein the support construction stage needs to meet the condition that the stress F is not less than the anchor pulling force F1 of the support pile to the soil body and the anchor pulling force F2 of the outer side wall plate concrete pouring, namely F is not less than F1+ F2; the anti-floating anchor rod end adopts the anchor plate to install and weld when pulling the anchor test, makes on its anchor pile body, and the anchor rod end stretches out reinforcing bar bending position and preferably is close to the lateral wall board outside reinforcing bar, makes it form and pulls the anchor structure between the reinforcing bar.
(2) The permeable pipe is arranged along the bottom of the foundation pit support pile and is arranged 50cm below the base, the periphery of the permeable pipe is filled with capillary macadam, the diameter of the permeable pipe is 20-30cm, and a grouting pipe is arranged at the top in the permeable pipe.
(3) The water stop screw is divided into an anti-pulling water stop screw and a bar-planting water stop screw in a conical shape, and one end of the anti-pulling water stop screw is welded with a barb section for anchoring the soil body; one end of the bar-planting water-stopping screw is provided with a rib and is used for planting bars on a pile body of a support pile, and the anchoring length of the bar-planting water-stopping screw is designed to meet the stress of a template when side wall concrete is poured.
(4) The waterproof structure is characterized in that the waterproof structure is double-layer and is arranged between the side wall face formed by the side wall plate and the supporting pile, the outer wall face formed by the supporting pile is a water sealing leveling layer formed by leveling waterproof mortar after the net is sprayed, the convex water drain pipe is cut flat, and the waterproof mortar cannot cover the water drain pipe opening. The waterproof non-sticky surface is adhered to the surface of the water sealing leveling layer by adopting a vertical brushing adhesive line, the brushing position is required to avoid plugging a water outlet, and the sticky surface faces the side wall plate side.
(5) The U-shaped water guide groove is 10-25cm in depth, the caliber of an upper opening is 8-12cm, the caliber is preferably not more than a steel bar elbow, the U-shaped water guide groove is made of polyethylene or glass fiber reinforced plastic and the like, is placed on a steel bar extending out of the end of the anti-floating anchor rod, an opening eave on one side is abutted against a supporting pile body, a middle gap is blocked by net sand-blasting slurry, and the U-shaped water guide groove is reasonably arranged according to the distance between the anti-floating anchor rods and the water quantity, and is arranged at a.
(6) And the water sealing leveling layer is coated and leveled by adopting waterproof mortar, and the thickness of the water sealing leveling layer is flush with the inner vertical surface of the crown beam.
A construction method of an anti-floating structure of an underground structure of a deep foundation pit comprises the following specific steps:
step 1, supporting piles and crown beam construction: preparing materials according to requirements, accurately measuring and setting out the pile position of the support pile, constructing the support pile and the crown beam according to design requirements, and performing next procedure construction after the support pile and the crown beam are detected to be qualified.
Step 2, earthwork, net spraying and anti-floating anchor rod construction: and (5) carrying out earth excavation while carrying out net spraying and anti-floating anchor rod construction until the bottom elevation of the foundation pit. Wherein the mesh spraying structure is subjected to one-time binding and installation of the reinforcing steel bar mesh pieces and mesh sand-blasting slurry construction after the earth excavation depth is 3-5 m; the anti-floating anchor rod is subjected to pore-forming construction after earth is excavated to the elevation, an anti-pulling force test is carried out after the strength meets the requirement, an anchor plate is sleeved on an anchor rod reinforcing steel bar before the test, and the anchor plate is tightly attached to a support pile for welding and anchoring after the test is drawn to an index value; the U-shaped water guide groove is installed before the anti-floating anchor rod construction is completed and the net sand blasting slurry is sprayed, and the fact that the net sand blasting slurry fills a gap between the U-shaped water guide groove and the side wall of the supporting structure is guaranteed.
Step 3, constructing a foundation anti-floating anchor rod and a water permeable pipe: digging a groove at the pile bottom edge of the support pile with the distance of 20-50cm, embedding a water permeable pipe, and filling by adopting capillary macadam; and meanwhile, constructing the foundation anti-floating anchor rod pile.
And 4, constructing a cushion layer, a waterproof layer and a bottom plate: and after the anti-floating anchor rod construction and detection, sequentially performing cushion layer, waterproof, protective layer, bottom plate steel bar binding, side wall and bottom plate post-cast strip water stop steel plate and concrete construction. The construction method comprises the following steps of constructing a water-sealing leveling layer on the bottom section of the side wall of the support pile, placing a water-stopping steel plate section at the bottom, wherein the waterproof non-sticky surface is adhered to the surface of the water-sealing leveling layer by adopting a vertical brushing adhesive line, a brushing position is required to avoid plugging a water outlet, sticky surfaces face the side wall plate, and a sticky surface protective layer is torn off from a coiled material before concrete pouring.
Step 5, sealing the water leveling layer, sealing the water screw rod and performing waterproof construction: the outer side face formed by the support piles is subjected to water sealing and leveling layer construction according to the construction section of the side wall of the basement in a layered mode, the U-shaped water guide groove is removed while construction is conducted, after the strength of the water sealing and leveling layer reaches 75% of the strength of water sealing and leveling layer concrete (if water sealing and leveling layer concrete is set to be C30, the maintenance strength needs to reach 30Kpa after 28 days, namely 30 75% =22.5 kPa), drilling is conducted between the pile body and the pile according to the measurement and calculation interval design, anchoring construction of the uplift water stop screw and the bar planting water stop screw is conducted, hole grouting is conducted on the uplift water stop screw, and then inserting is conducted on the bar planting water stop screw after bar planting glue is smeared. And then carrying out waterproof construction, wherein the surface of the waterproof non-sticky surface is adhered with the surface of the water sealing leveling layer by adopting a vertical brushing adhesive line, the brushing position is required to avoid plugging a water outlet, the side wall water is ensured to flow to the base screw rod for guiding out through an insertion pipe, sticky surfaces face the side wall plate, and a sticky surface protective layer is torn off from the coiled material before concrete pouring.
Step 6, side wall plate construction: binding the reinforcing steel bars of the side wall plate, and installing and reinforcing the inner side film; and (4) extracting the insertion pipe at the base screw, plugging the opening of the insertion pipe and immediately pouring concrete on the side wall plate.
The invention has the following distinctive characteristics besides the traditional functions:
1) the anchor pulling structure of the anchor pulling pile adopts the anti-floating anchor pile, and the temporary supporting structure is reasonably combined with the permanent structure, so that the use efficiency of the supporting structure is effectively improved, and the cost and the time delay are reduced;
2) the anti-floating anchor rods are added on the side wall plate, so that the side wall plate can be pulled and tied by the anti-floating anchor rod piles to offset lateral stress when being subjected to strong lateral water pressure, and the anti-floating performance of the whole underground structure in the deep foundation pit is enhanced;
3) the anchor pulling pile structure is in direct contact with an underground structure, so that the earth excavation amount and the backfill amount between two originally designed structures are reduced, and the construction of a formwork and an outer scaffold of the outer vertical surface of the side wall can be reduced.
4) The structure is simple, safe and stable, the used material is single, the construction cost is low, the efficiency is high and the effect is good.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (6)
1. An anti-floating system of an underground structure of a deep foundation pit is characterized by comprising anchor pulling piles, a net-spraying structure arranged between the anchor pulling piles and a U-shaped water guiding groove arranged at the end of the anchor pulling pile, wherein a water drain pipe is arranged on the net-spraying structure and penetrates through a soil body, so that water is guided to the U-shaped water guiding groove through the water drain pipe and is collected to a water collecting well for pumping and drainage along the water guiding groove; waterproof layers are arranged at the bottoms of the anchor pulling piles and the raft plates, one end of a water stop screw is anchored on the anchor pulling piles or sprayed on a soil body through a net, the bottom plate is connected with the anchor pulling piles, the side wall plate is also connected with the anchor pulling piles, the water stop screw further comprises a water permeable pipe and a water sealing leveling layer, the water permeable pipe is arranged along the bottom of the foundation pit support pile and is arranged at a position 30-50cm below the base, capillary broken stones are adopted to fill the periphery of the water permeable pipe, the diameter is 20-30cm, and a grouting pipe is arranged at the top in the pipe; the thickness of the water sealing leveling layer is flush with the inner vertical surface of the crown beam, the water sealing leveling layer is arranged on the outer layer of the vertical surface net spraying structure outside the support pile, the waterproof non-sticky surface of the waterproof layer is adhered with the surface of the water sealing leveling layer by adopting a vertical brushing adhesive line, and the sticky surfaces face the side wall plate side.
2. The anti-floating system of an underground structure of a deep foundation pit as claimed in claim 1, wherein the anchor pulling pile comprises a support pile, a crown beam and an anti-floating anchor rod, the anti-floating anchor rod is anchored on the support pile by using an anchor plate, the anchor plate and the anti-floating anchor rod are welded during an anti-floating anchor rod anchor pulling test, and the crown beam is arranged at the top end of the support pile to connect the support pile.
3. The anti-floating system of an underground structure of a deep foundation pit as claimed in claim 1, wherein the net-jet structure is arranged between the support piles, the net-jet structure and the support piles are anchored by using embedded bars, and the net-jet structure thickens the guniting to enable the measuring surface to be flush with the pile body.
4. An anti-floating system for an underground structure of a deep foundation pit as claimed in claim 1, wherein the U-shaped water guiding chute is arranged at the end of the anti-floating anchor rod and close to the support pile, the waterproof layer is arranged on the outer surface of the support pile and the bottom of the raft, one end of the water stopping screw rod is anchored on the support pile or sprayed on the soil body through a net, the bottom plate is connected with the anti-floating anchor rod, and the side wall plate is also connected with the anti-floating anchor rod anchored on the support pile.
5. The anti-floating system of an underground structure of a deep foundation pit as claimed in claim 1, wherein the waterproof layer is made of SBS modified asphalt coiled material, the double layers are paved and arranged between the support piles and the side wall plates, and the side wall concrete layer is poured after the surface of the support piles are paved.
6. A construction process of an anti-floating system of an underground structure of a deep foundation pit is characterized by comprising the following steps:
step 1, supporting piles and crown beam construction: preparing materials according to requirements, accurately measuring and setting out the pile position of a support pile, constructing the support pile and the crown beam according to design requirements, and performing next procedure construction after the support pile and the crown beam are detected to be qualified;
step 2, earthwork, net spraying structure and anti-floating anchor rod construction: carrying out earth excavation while carrying out net-spraying structure and anti-floating anchor rod construction until the bottom elevation of the foundation pit is reached; wherein the mesh spraying structure is subjected to one-time binding and installation of the reinforcing steel bar mesh pieces and mesh sand-blasting slurry construction after the earth excavation depth is 3-5 m; the anti-floating anchor rod is subjected to pore-forming construction after earth is excavated to the elevation, an anti-pulling force test is carried out after the strength meets the requirement, an anchor plate is sleeved on an anchor rod reinforcing steel bar before the test, and the anchor plate is tightly attached to a support pile for welding and anchoring after the test is carried out to an index value by pulling; the U-shaped water guide groove is installed before the anti-floating anchor rod construction and the net sand blasting slurry are completed, and the net sand blasting slurry is ensured to fill a gap between the U-shaped water guide groove and the side wall of the supporting structure;
step 3, constructing a foundation anti-floating anchor rod and a water permeable pipe: digging a groove at the pile bottom edge of the support pile with the distance of 20-50cm, embedding a water permeable pipe, and filling by adopting capillary macadam; meanwhile, constructing a foundation anti-floating anchor rod pile;
and 4, constructing a cushion layer, a waterproof layer and a bottom plate: after the anti-floating anchor rod construction and detection, sequentially performing cushion layer, waterproof, protective layer, bottom plate steel bar binding, side wall and bottom plate post-cast strip water-stop steel plate and concrete construction; the construction method comprises the following steps of constructing an outer side wall of a structure in a waterproof manner, firstly performing water sealing leveling layer construction on a bottom section of the side wall of a support pile and placing a water-stopping steel plate section at the bottom, wherein a waterproof non-sticky surface is bonded with the surface of the water sealing leveling layer by adopting a vertical brushing adhesive line, the brushing position is required to avoid plugging a water outlet, sticky surfaces face the side wall plate, and a sticky surface protective layer is torn off from a coiled material before concrete pouring;
step 5, sealing the water leveling layer, sealing the water screw rod and performing waterproof construction: the outer side face formed by the support piles is subjected to water sealing and leveling layer construction according to the construction section of the side wall of the basement in a layered mode, the U-shaped water guide groove is removed while construction is carried out, after the strength of the water sealing and leveling layer reaches 75% of the strength of concrete of the water sealing and leveling layer, holes are drilled between the pile body and the piles according to the design of measuring and calculating intervals, anchoring construction of the anti-pulling water stop screw rods and the bar planting water stop screw rods is carried out, the anti-pulling water stop screw rods are inserted after hole grouting is carried out, and the bar planting water stop screw rods are inserted after; then, performing waterproof construction, wherein a waterproof non-sticky surface is adhered to the surface of the water sealing leveling layer by adopting a vertical brushing adhesive line, a brushing position is required to avoid blocking a water outlet, the side wall water flows to a base screw to be guided out through an insertion pipe, sticky surfaces face the side wall plate, and a sticky surface protection layer is torn off from a coiled material before concrete pouring;
step 6, side wall plate construction: binding the reinforcing steel bars of the side wall plate, and installing and reinforcing the inner side film; and (4) extracting the insertion pipe at the base screw, plugging the opening of the insertion pipe and immediately pouring concrete on the side wall plate.
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