CN114837206A - Active waterproof system of suspension bridge anchorage foundation enclosing structure and construction method - Google Patents
Active waterproof system of suspension bridge anchorage foundation enclosing structure and construction method Download PDFInfo
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- CN114837206A CN114837206A CN202210492321.2A CN202210492321A CN114837206A CN 114837206 A CN114837206 A CN 114837206A CN 202210492321 A CN202210492321 A CN 202210492321A CN 114837206 A CN114837206 A CN 114837206A
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- 238000010276 construction Methods 0.000 title claims abstract description 41
- 239000000725 suspension Substances 0.000 title claims abstract description 33
- 238000009412 basement excavation Methods 0.000 claims abstract description 9
- 238000004078 waterproofing Methods 0.000 claims abstract description 6
- 230000002787 reinforcement Effects 0.000 claims description 34
- 229910000831 Steel Inorganic materials 0.000 claims description 27
- 239000010959 steel Substances 0.000 claims description 27
- 239000011248 coating agent Substances 0.000 claims description 19
- 238000000576 coating method Methods 0.000 claims description 19
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 15
- 229910001220 stainless steel Inorganic materials 0.000 claims description 13
- 239000004567 concrete Substances 0.000 claims description 11
- 238000005253 cladding Methods 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 7
- 238000011065 in-situ storage Methods 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 6
- 239000011247 coating layer Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 23
- 238000005370 electroosmosis Methods 0.000 description 15
- 230000002265 prevention Effects 0.000 description 4
- 230000003014 reinforcing effect Effects 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 239000011380 pervious concrete Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
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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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
-
- 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
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Structural Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
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- General Engineering & Computer Science (AREA)
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Abstract
The invention belongs to the technical field of water proofing and impermeability of deep foundation pits, and particularly relates to an active waterproof system of a suspension bridge anchorage foundation enclosure structure and a construction method of the active waterproof system. The invention provides an active waterproof system and a construction method for a suspension bridge anchorage foundation enclosure structure, which can realize a dry operation environment before excavation and core filling pouring of an anchorage enclosure structure foundation pit and ensure safe and civilized construction of an anchorage.
Description
Technical Field
The invention belongs to the technical field of water proofing and seepage resistance of deep foundation pits, and particularly relates to an active waterproof system and a construction method of a suspension bridge anchorage foundation enclosure structure.
Background
The prior art is as follows:
in recent years, with the rapid development of Chinese economy, civilization results are rapidly and widely spread, and the construction of large-span bridges realizes revolutionary leap. As an important force bearing part of a large-span suspension bridge, the design and construction of an anchorage are very important. For the large-diameter secant pile anchor foundation with the integrated pile wall, the method has the advantages of high construction speed and economical construction cost, and is adopted by more and more projects. This kind of basic form need carry out the bottom plate after the excavation deep basal pit and pour, in order to ensure construction safety, will guarantee that the foundation ditch lateral wall does not have the percolating water. The commonly used water blocking measure is grouting treatment at the occlusion part of the pile wall, but due to the unfavorable factors that the verticality of the pile body, the grouting construction quality, the occlusion degree and the like cannot be ensured, the moisture outside the fender post inevitably permeates into a foundation pit, and a great deal of inconvenience is brought to the construction operation in the anchorage.
The patent (No. CN 214005683U) discloses a waterproof design structure of a foundation pit, wherein a double-layer waterproof layer and a filtering and water absorbing layer are arranged on the inner wall of the foundation pit, rainwater is pumped out after being filtered, and the water pump is prevented from being blocked during precipitation. This patent is mainly to getting rid of rainwater, is difficult to avoid the infiltration of the outer water of envelope to the foundation ditch inner wall.
The invention discloses a foundation pit electroosmosis waterproof wall in a water-rich area and a construction method thereof (publication number: CN 112681351A). The invention excavates a working well at the periphery of a foundation pit, adopts a similar pipe-jacking construction method to jack an electroosmosis plate into the bottom of the foundation pit, and prevents external moisture from entering the pit through the bottom of the foundation pit after electrification. The method can only aim at soft soil areas, for an anchorage foundation, the bottom of the foundation generally can be located on medium and slightly weathered bedrock, and the electroosmosis plate cannot be pushed in.
The invention patent (publication number: CN 105544618A) discloses an electro-osmosis anti-seepage damp-proof method for an earth negative pole type underground space, which is characterized in that holes are drilled on a foundation pit enclosure wall, and a positive pole material is distributed in the holes to form a loop with an earth negative pole area. The water is brought to the area far away from the foundation pit under the action of the electric field, so that the seepage prevention and moisture prevention of the enclosure structure are realized. However, the method needs to be powered on all the time, and if the power is off, water seeps into the foundation pit through the drilled hole at the anode, so that the power consumption is large, and the electrode is easy to corrode. And for anchorage foundation pits, the side walls are mostly strong and medium-aged rocks, and for anchorage foundation pits with the depth of tens of meters, drilling on the side walls of the enclosure structures is difficult, and the operability is poor.
The difficulty and significance for solving the technical problems are as follows:
therefore, based on the problems, the active waterproof system and the construction method for the foundation enclosure structure of the suspension bridge, which can realize a dry working environment before excavation of a foundation pit of the anchor enclosure structure and core filling and pouring and ensure safe and civilized construction of the anchor, have important practical significance.
Disclosure of Invention
The application aims to solve the technical problems in the prior art and provide the active waterproof system and the construction method for the foundation enclosure structure of the suspension bridge anchorage foundation, which can realize dry operation environment before excavation and core filling pouring of the foundation pit of the anchorage enclosure structure and guarantee safe and civilized construction of the anchorage.
The technical scheme adopted by the embodiment of the application to solve the technical problems in the prior art is as follows:
the active waterproof system of the suspension bridge anchorage foundation enclosure structure comprises a reinforcement cage and a cathode dewatering well, wherein at least one reinforcement coating layer reinforcement anode is replaced on the reinforcement cage, the reinforcement cage is a reinforcement cage in a bored pile and/or an enclosure wall, a cathode reinforcement section is arranged in the cathode dewatering well, and the coating reinforcement anode and the cathode dewatering well are connected through a lead.
The embodiment of the application can also adopt the following technical scheme:
in the active waterproof system of the suspension bridge anchorage foundation enclosure structure, the cathode dewatering well comprises a permeable concrete pipe, a stainless steel wire mesh is wrapped outside the permeable concrete pipe, and the top of the stainless steel wire mesh is connected with a cathode reinforcing steel bar section.
In the active waterproof system of the suspension bridge anchorage foundation envelope structure, the outer part of the coating reinforcing steel bar anode is a stainless steel coating, and the inner part of the coating reinforcing steel bar anode is a coating inner reinforcing steel bar.
In the active waterproof system of the suspension bridge anchorage foundation enclosure structure, the anode of the coated reinforcing steel bar is positioned at the occlusion connection position of the reinforcing cage.
In the active waterproof system of the suspension bridge anchorage foundation enclosure structure, the cathode dewatering well is positioned in the range of 5-10 m outside the foundation pit.
A construction method of an active waterproof system of a suspension bridge anchorage foundation enclosure structure is used for constructing the active waterproof system of the suspension bridge anchorage foundation enclosure structure.
In the above construction method of the active waterproof system of the suspension bridge anchorage base enclosure structure, further, the construction method of the active waterproof system of the suspension bridge anchorage base enclosure structure includes the following steps:
the method comprises the following steps: and when the reinforcement cage is processed, the anode of the coated reinforcement is directly welded on the reinforcement cage.
In the construction method of the active waterproof system of the foundation enclosure structure of the suspension bridge anchorage, the following steps are further included after the first step:
step two, adopting the construction of the cast-in-situ bored pile and the enclosure wall in the step one; constructing a cathode dewatering well;
step three: and (3) excavating the foundation pit, checking the inner wall of the foundation pit support structure in the excavation process, searching a leakage point, connecting a cladding reinforcing steel bar anode and a cathode dewatering well near the leakage point by using a lead and a voltage-stabilizing direct-current power supply, applying direct current, and continuing the process until concrete pouring of the anchorage foundation filling core is finished.
One or more technical schemes provided in the embodiment of the application have at least the following beneficial effects:
1. the method takes the later-stage enclosure leakage problem into consideration when the large-diameter secant pile enclosure structure is constructed, uses part of stainless steel cladding reinforcing steel bars to replace reinforcing steel bars, excavates a cathode dewatering well, applies direct current after leakage points are found in the excavation process of a foundation pit, and opens electro-osmosis water blocking to ensure that water is electrolyzed and transferred into a well point pipe. The technology is started near a grouting leakage-proof failure point, can be used as a last waterproof barrier of a foundation pit, is simple to construct and high in operability, and has important significance for guaranteeing normal construction operation and construction safety in an anchorage.
2. The invention is mainly used for actively preventing water of an anchorage foundation using a round-rectangular occlusive pile envelope structure, and can simply realize the active waterproof technology of seepage prevention and moisture prevention of the anchorage foundation of the large-diameter occlusive pile. And (3) setting a dewatering well point within the range of 5-10 m outside the foundation pit, and wrapping a metal filter screen outside the well point pipe to be used as a cathode. When the building envelope is found to be seeped, the coating steel bars and the well point filter pipes around the seeping points are electrified with direct current, so that water is electrolyzed and migrated into the well point pipes. The technology is started within 2m of a grouting leakage-proof failure point position, can be used as a waterproof last barrier of a foundation pit, and has important significance for guaranteeing normal construction operation and construction safety in an anchorage.
3. The electrode has been arranged at the foundation ditch bottom mostly to prior art, does not arrange the electro-osmosis initiative waterproof system at the foundation ditch lateral wall, so water still can follow the lateral wall infiltration, and this patent has solved this problem, has arranged the electro-osmosis initiative waterproof system at the lateral wall, avoids water to permeate via the foundation ditch lateral wall.
4. The prior art adopts the mode that the electrode is arranged in the drill hole, however, the drill hole on the rock becomes a good drainage channel, and water can seep out from the drill hole, so that the power needs to be always supplied, and if the power is not always supplied, the water can seep out through the drill hole. And this patent, the steel reinforcement cage of cladding steel bar electrode and drilling bored concrete pile is integrative, is pour in the concrete, does not have the drilling problem, does not have the passageway, so can the intermittent type circular telegram.
Drawings
Technical solutions of embodiments of the present application will be described in further detail below with reference to the accompanying drawings, but it should be understood that these drawings are designed for illustrative purposes only and thus do not limit the scope of the present application. Furthermore, unless otherwise indicated, the drawings are intended to be illustrative of the structural configurations described herein and are not necessarily drawn to scale.
Fig. 1 is a schematic view of an active waterproof system of a suspension bridge anchorage foundation envelope structure of the invention;
FIG. 2 is a view of a partial rebar layout of the present invention;
FIG. 3 is a schematic view of an anode of the coated reinforcing steel bar according to the present invention;
FIG. 4 is a structural diagram of the cathode dewatering well according to the present invention.
In the figure:
the device comprises a cast-in-situ bored pile 1, a retaining wall 2, a cathode dewatering well 3, a lead 4, a voltage-stabilizing direct-current electroosmosis cabinet 5, reinforcing steel bars 6, a coating reinforcing steel bar anode 7, a stainless steel coating 8, coating inner reinforcing steel bars 9, a permeable concrete pipe 10, a stainless steel wire mesh 11 and a cathode reinforcing steel bar section 12.
Detailed Description
In order to better understand the technical scheme, the technical scheme is described in detail in the following with reference to the attached drawings of the specification and specific embodiments.
Example 1
An active waterproof system of a suspension bridge anchorage foundation enclosure structure mainly comprises a cast-in-situ bored pile 1, an enclosure wall 2, a cathode dewatering well 3, a lead 4 and a voltage-stabilizing direct-current electroosmosis cabinet 5.
The local steel bars 6 on the cast-in-situ bored pile 1 and the enclosure wall 2 are replaced by the steel bar anode 7 of the coating layer, and the anode is used as an electroosmosis anti-seepage anode, so that the anode corrosion can be avoided as much as possible; when the steel reinforcement cage is processed, the anode 7 of the cladding steel reinforcement is directly welded on the steel reinforcement cage. The external part of the coating steel bar anode 7 is a stainless steel coating 8, and the internal part is a coating internal steel bar 9.
The reinforcement cage in the prior art uses common reinforcement; 1. when adopting the electroosmosis initiative during waterproof, use single cladding reinforcing bar to replace the ordinary reinforcing bar of this position, be given the cladding reinforcing bar and lead to direct current, realize moisture from the directional removal of foundation ditch lateral wall to well point pipe. 2. Each steel bar is not needed to be electrified, which is troublesome, and one coating steel bar can play a role; 3. the coated steel bar is used as an anode, the electrolytic effect is better than that of the common steel bar under the action of direct current, and the longer service life can be ensured.
The cathode dewatering well 3 is wrapped with a stainless steel wire mesh 11 outside the pervious concrete pipe 10, and is provided with a cathode steel bar section 12 at the top and used as an electroosmosis and anti-seepage cathode. The cathode lead is directly connected to the cathode rebar length 12, and then the current is uniformly conducted to the stainless steel rebar grid 11. The connecting wire is convenient to connect and the current is convenient to be uniformly transmitted. After the direct current is applied through the voltage-stabilizing direct current electroosmosis cabinet 5 and the lead 4, water around the building enclosure moves from the anode to the cathode, and is pumped away by a drainage pump after penetrating through the stainless steel wire mesh 11 and the pervious concrete pipe 10.
The technical scheme in the embodiment of the application at least has the following technical effects or advantages:
the embodiment uses the corrosion-resistant coated steel bar as the anode to replace the steel bar on the conventional steel bar cage, so that the long-time reliable operation of the waterproof system can be guaranteed. The waterproof and supporting are combined, the electrodes do not need to be drilled and arranged at the later stage, the nearby electrification and the waterproof can be realized after the water leakage point is discovered, and the electricity and the cost are saved.
Example 2
The construction method of the active waterproof system of the foundation enclosing structure of the suspension bridge anchorage comprises the following steps:
the method comprises the following steps: and (3) processing the reinforcement cages of the cast-in-situ bored pile 1 and the enclosure wall 2 according to the reinforcement arrangement mode marked in the figure 1 and by using part of the clad reinforcements to replace common reinforcements, and performing pile wall construction. And constructing a cathode dewatering well 3, wherein the dewatering wells are annularly arranged according to 30 degrees, and water in rock and soil bodies outside the foundation pit is collected and pumped out.
Step two: and (5) excavating the foundation pit, wherein the inner wall of the foundation pit support structure is checked in the excavation process, and a leakage point is searched.
Step three: the lead 4 and the stabilized voltage direct current power supply 5 are used for connecting the anode 7 of the coating steel bar near the leakage point and the cathode precipitation well 3, and direct current of 30V-60V is applied to start electroosmosis water resistance. Part of water is transferred from the anode to the cathode, part of water is electrolyzed, and the inner wall of the enclosure structure returns to a dry state.
Step four: and (3) adopting an electroosmosis control mode of intermittent electrification, and continuing the process until the concrete pouring of the anchor foundation core filling is finished.
Step five: and removing the lead 4 and the voltage-stabilizing direct-current power supply 5 to finish the water blocking operation.
The technical scheme in the embodiment of the application at least has the following technical effects or advantages:
this embodiment is in steel reinforcement cage processing stage, is about to coat steel reinforcement electrode positive pole and steel reinforcement cage set together, is pour in the concrete, and the construction is simple and convenient. The grouting plugging construction method is started at the position where grouting plugging construction fails, and can be used as a waterproof last barrier to maintain a dry operation environment in a foundation pit.
In conclusion, the invention provides the active waterproof system and the construction method for the foundation enclosure structure of the suspension bridge anchorage, which can realize a dry working environment before excavation of a foundation pit of the anchorage enclosure structure and core filling and pouring and ensure safe and civilized construction of the anchorage.
The present invention has been described in detail with reference to the above examples, but the description is only for the preferred examples of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (8)
1. The utility model provides a suspension bridge anchorage basis envelope initiative waterproof system which characterized in that: the active waterproof system of the suspension bridge anchorage foundation enclosure structure comprises a reinforcement cage and a cathode dewatering well, wherein at least one reinforcement coating layer reinforcement anode on the reinforcement cage is replaced by a reinforcement cage in a bored pile and/or an enclosure wall, a cathode reinforcement section is arranged in the cathode dewatering well, and the coating reinforcement anode and the cathode dewatering well are connected through a lead.
2. The active waterproofing system of a suspension bridge anchorage foundation envelope of claim 1, characterized in that: the cathode dewatering well comprises a permeable concrete pipe, a stainless steel wire mesh is wrapped outside the permeable concrete pipe, and the top of the stainless steel wire mesh is connected with a cathode reinforcing steel bar section.
3. The active waterproofing system of a suspension bridge anchorage foundation envelope of claim 1, characterized in that: the outer part of the coating steel bar anode is a stainless steel coating, and the inner part of the coating steel bar anode is a coating inner steel bar.
4. The active waterproofing system of a suspension bridge anchorage foundation envelope of claim 1, characterized in that: and the anode of the coated steel bar is positioned at the occlusion connection position of the steel bar cage.
5. The active waterproofing system of a suspension bridge anchorage foundation envelope of claim 1, characterized in that: the cathode dewatering well is located in the range of 5-10 m outside the foundation pit.
6. A construction method of an active waterproof system of a suspension bridge anchorage foundation enclosing structure is characterized by comprising the following steps: the construction method is used for constructing the active waterproof system of the suspension bridge anchorage foundation envelope structure in any one of claims 1 to 5.
7. The construction method of the active waterproof system of the suspension bridge anchorage foundation envelope structure of claim 6, characterized in that: the construction method of the active waterproof system of the suspension bridge anchorage foundation enclosing structure comprises the following steps:
the method comprises the following steps: and when the reinforcement cage is processed, the anode of the coated reinforcement is directly welded on the reinforcement cage.
8. The construction method of the active waterproof system of the suspension bridge anchorage foundation envelope structure of claim 7, characterized in that: the first step is followed by the following steps:
step two, adopting the construction of the cast-in-situ bored pile and the enclosure wall in the step one; constructing a cathode dewatering well;
step three: and (3) excavating the foundation pit, inspecting the inner wall of the foundation pit support structure in the excavation process, searching a leakage point, connecting a cladding reinforcing steel bar anode and a cathode dewatering well near the leakage point by using a lead and a voltage-stabilizing direct-current power supply, applying direct current, and continuing the process until concrete pouring of the anchorage foundation core filling is finished.
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| CN202210492321.2A CN114837206B (en) | 2022-05-07 | 2022-05-07 | Active waterproof system for anchorage foundation enclosure structure of suspension bridge and construction method |
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| CN202210492321.2A CN114837206B (en) | 2022-05-07 | 2022-05-07 | Active waterproof system for anchorage foundation enclosure structure of suspension bridge and construction method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117251992A (en) * | 2023-08-28 | 2023-12-19 | 华南理工大学 | Calculation method of infiltration line of anchorage circular foundation pit |
| CN117286870A (en) * | 2023-11-23 | 2023-12-26 | 中国建筑第六工程局有限公司 | Novel intelligent grouting reinforcement method for processing complex geology |
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| CN110055951A (en) * | 2019-04-01 | 2019-07-26 | 同济大学 | Self-power generation type consolidation by electroosmosis soft soil foundation device |
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2022
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| CN117286870A (en) * | 2023-11-23 | 2023-12-26 | 中国建筑第六工程局有限公司 | Novel intelligent grouting reinforcement method for processing complex geology |
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| CN114837206B (en) | 2024-02-06 |
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