CN113006139A - Complete replacement method for treating side wall defects - Google Patents
Complete replacement method for treating side wall defects Download PDFInfo
- Publication number
- CN113006139A CN113006139A CN202110331038.7A CN202110331038A CN113006139A CN 113006139 A CN113006139 A CN 113006139A CN 202110331038 A CN202110331038 A CN 202110331038A CN 113006139 A CN113006139 A CN 113006139A
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- side wall
- grouting
- range
- replacement method
- complete replacement
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
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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
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/16—Arrangement or construction of joints in foundation structures
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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
- E02D2250/00—Production methods
- E02D2250/0023—Cast, i.e. in situ or in a mold or other formwork
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
- E02D2300/0029—Steel; Iron
Abstract
The invention discloses a complete replacement method for treating side wall defects, which comprises the following steps: step one, determining the defect range of the side wall, and erecting a temporary support made of I-steel; step two: a grouting pipe and a mold bag grouting pipe are arranged, and grouting and mold bag grouting are carried out through the grouting pipe and the mold bag grouting pipe so as to reinforce the grouting range of the stratum behind the side wall; step three: removing the I-1 section of loose concrete, and chiseling the concrete in the overlap joint range of the new and old reinforcing steel bars; step four: excavating a primary support range behind the side wall to complete soil body support; step five: replacing the steel bars in the original bent side wall with new steel bars; step six: erecting two vertical upright posts in the side walls; therefore, the invention provides a comprehensive supporting scheme before side wall replacement, a comprehensive grouting method for reinforcing a back soil body and a replacement process of the whole defect wall body, can effectively ensure the construction safety in the replacement process of the defect position of the side wall, can effectively treat the problem of the defect of the side wall, and can be widely popularized in the technical field of treatment of the defect of the side wall of an underground structure.
Description
Technical Field
The invention relates to the technical field of underground wall defect treatment, in particular to a complete replacement method for treating side wall defects.
Background
Underground space engineering represented by subways, urban complexes, building basements, underground garages and the like appears in great quantity in the urban construction process in recent years, and the engineering realized in the early stage gradually exposes a plurality of problems in the use process, such as water leakage, side wall damage caused by the local construction quality problem of the side wall or the change of the surrounding environment, and the defect treatment of the underground engineering is always a difficult problem in the engineering maintenance process because one side of the underground engineering is the soil facing side. At present, no complete replacement technical scheme can guide construction.
Therefore, in view of the above-mentioned drawbacks, the present inventors have conducted extensive research and design to overcome the above-mentioned drawbacks by designing a replacement method for treating the side wall defects in a complete set, which combines the experience and results of the related industries for many years.
Disclosure of Invention
The invention aims to provide a complete replacement method for treating side wall defects, provides a comprehensive supporting scheme before side wall replacement, a comprehensive grouting method for reinforcing a back soil body and a replacement process of a whole defect wall body, can effectively ensure the construction safety in the replacement process of the side wall defect position, can effectively treat the side wall defects, and can be widely popularized in the technical field of treatment of the side wall defects of underground structures.
In order to achieve the purpose, the invention discloses a complete replacement method for treating side wall defects, which is characterized by comprising the following steps of:
the method comprises the following steps of firstly, determining the defect range of the side wall, erecting a temporary support made of I-shaped steel, wherein the side wall is provided with original side wall vertical reinforcing steel bars and original side wall horizontal reinforcing steel bars, and determining the original intact range needing chiseling at the periphery of the defect range;
step two: a grouting pipe and a mold bag grouting pipe are arranged, and grouting and mold bag grouting are carried out through the grouting pipe and the mold bag grouting pipe so as to reinforce the grouting range of the stratum behind the side wall;
step three: removing the I-1 section of loose concrete, and chiseling the concrete in the overlap joint range of the new and old reinforcing steel bars;
step four: excavating a primary support range behind the side wall, performing anchor spraying, net hanging and portal steel frame erection to complete soil body support below the mold bag and behind the side wall, cutting off steel pipes inside the mold bag within the thickness range of the side wall, supporting the mold bag steel pipes on the portal steel frame, and completing the fulcrum conversion inside the mold bag;
step five: cleaning and breaking concrete surface floating dust, reserving a groove on the surface of the rest concrete, reserving a water-swelling water stop strip as a condition, derusting the reinforcing steel bars of the original side wall, replacing the reinforcing steel bars in the original bent side wall with new reinforcing steel bars, and removing intact concrete protective layers with original intact ranges at two ends needing chiseling;
step six: erecting two vertical upright posts in the side walls;
step seven: after the erection is finished, repeating the step I-1 to finish the temporary support of the sections I-2 and I-3;
step eight: and applying a water-swelling adhesive tape, coating an interface agent, reserving the vertical upright post, and pouring the I-section side wall.
Wherein: the upper end of the temporary support is anchored to the side wall through the upper steel plate and the upper anchor bolts to exceed the position above the original intact chiseling-out range, and the lower end of the temporary support is anchored to the bottom plate through the lower steel plate and the lower anchor bolts.
Wherein: the horizontal mould bag pivot is based on a structural wall, and the vertical mould bag grouting mainly plays a role in isolating the stratum and the existing side wall structure, and grouting is vertically performed within a range of 2m and 3m from the bottom of the bottom plate to the outside of the overlap joint range of the new and old defective concrete reinforcing steel bars.
Wherein: the grouting material is made of superfine cement, the water cement ratio is 1:1, and the grouting pressure is 0.5-1 MPa.
Wherein: the outer side of the portal frame is provided with a reinforcing mesh, and the inner side and the outer side of the portal frame are both provided with longitudinal tie bars.
Wherein: further comprises the ninth step: and repeating the steps from the second step to the eighth step, and performing construction in a skipping sequence.
Wherein: further comprising the step of ten: and sticking a layer of reinforcing mesh on the whole surface, and then leveling by adopting high-strength polymer mortar.
According to the above content, the complete replacement method for treating the side wall defects has the following effects:
1. the traditional grouting process and the mold bag grouting process are combined, the reinforcing effect of a weak stratum at the back of the underground wall body can be effectively guaranteed, the temporary support is adopted to effectively prevent the adverse effect of the grouting process on the existing flawless structure, the side wall defect is treated under the conditions of effective support and stratum stabilization at the back, and the defect treatment of the underground wall body is realized.
2. The novel practical technical organization is provided for the treatment of the defect side wall, the construction equipment is conventional, materials are easy to obtain and process, the operation is easy, the popularization and the application are easy, the application prospect is wide, and the comprehensive benefits of the technical, economic and environmental aspects are good.
The details of the present invention can be obtained from the following description and the attached drawings.
Drawings
FIG. 1 shows a schematic flow chart of the complete replacement method for treating side wall defects of the invention.
Figure 2 shows a cross-sectional schematic of the invention.
Figure 3 shows a schematic longitudinal section of the invention.
Fig. 4 shows a schematic view of the present invention for chiseling the concrete segments of the sidewall in the longitudinal direction.
Fig. 5 shows a schematic view of sidewall reinforcement according to the present invention.
Fig. 6 shows a cross-sectional view along a-a in fig. 5.
Reference numerals:
10. a side wall; 11. a top plate; 12. a base plate; 13. a defective portion; 14. vertical columns in the wall; 15. temporary support; 16. a vertical mould bag grouting part; 17. a water bottle mold bag grouting part; 151. steel plate feeding; 152. an upper anchor bolt; 153. a lower steel plate; 154. a lower anchor bolt; 101. original side wall vertical steel bars; 102. the original intact range needs to be chiseled; 1021. welding points of reinforcing steel bars; 103. original side wall horizontal steel bars; 104. and newly adding side wall reinforcing steel bars.
Detailed Description
Referring to fig. 1, a flow chart of the complete replacement method for treating side wall defects of the present invention is shown, wherein the underground wall comprises a side wall 10, a top plate 11 and a bottom plate 12, and a defect portion 13 is formed in the side wall 10.
Referring to fig. 2, fig. 3, fig. 4, fig. 5 and fig. 6, the complete replacement method for treating sidewall defects includes the following steps:
step one, determining a defect range 13 of a side wall 10, erecting a temporary support 15 made of I-shaped steel, and referring to fig. 2, fig. 3, fig. 5 and fig. 6, wherein the side wall 10 is provided with original side wall vertical steel bars 101 and original side wall horizontal steel bars 103, determining an original intact range 102 to be chiseled by means of a resiliometer test at the periphery of the defect range 13, if the resilience meets the strength requirement of designed concrete, the intact part is determined, the upper end of the temporary support 15 is anchored to the upper position of the side wall exceeding the original intact range 102 to be chiseled through an upper steel plate 151 and a plurality of upper anchor bolts 152, and the lower end is anchored to a bottom plate 12 through a lower steel plate 153 and a plurality of lower anchor bolts 154, so as to form a stable.
In fig. 3, H1 is the height of the concrete in the defect range from the bottom surface of the bottom plate 12, H2 is the height of the concrete in the defect range, c is the overlap range of the new and old reinforcing steel bars, H1 is the concrete breaking range, and H2 is the grouting range 18 behind the side wall.
Step two: a grouting pipe and a mold bag grouting pipe are arranged, and grouting and mold bag grouting are carried out through the grouting pipe and the mold bag grouting pipe so as to reinforce the grouting range of the stratum behind the side wall; specifically, as shown in fig. 3, a grouting pipe is arranged to perform system grouting on the stratum at an interval of 1m by 1m, and the grouting pipe is adopted to inject cement slurry into the stratum; arranging horizontal and vertical mould bag grouting pipes, performing mould bag grouting, and further reinforcing the stratum, wherein 1) the horizontal mould bag grouting pipes are arranged along the reinforcing periphery at an interval of 0.4 m; 2) vertical mould bag slip casting pipes are arranged along the longitudinal reinforcing range of the station, and the distance is 0.8 m. And the stratum to be grouted at the back of the side wall is reinforced by combining common system grouting and mold bag grouting. The horizontal die bag supporting points in the breaking range are based on a structural wall body, and mainly play a role in shed protection after the side wall is opened; the vertical mould bag grouting mainly plays a role in isolating the stratum and the existing side wall structure, grouting is carried out in a range of 2m vertically from the bottom of the bottom plate to the overlap joint range of new and old reinforcement bars of the defective concrete and in a range of 3m horizontally, the grouting material is made of superfine cement, the water cement ratio is 1:1, and the grouting pressure is 0.5-1 MPa.
Step three: and (3) removing the I-1 section of loose concrete by adopting equipment such as an air pick and the like, chiseling out intact concrete in the lap joint range of the new and old reinforcing steel bars, and judging the intact boundary by adopting springback.
Step four: excavating a primary support range of 150mm behind the side wall, anchoring, spraying, hanging a net, erecting a portal steel frame to complete the support of soil below the mold bag and behind the side wall, cutting off steel pipes inside the mold bag within the thickness range of the side wall, supporting the mold bag steel pipes on the portal steel frame, and completing the conversion of pivots inside the mold bag. The door-type steel frame stands in the 150 mm's behind the side wall within range, and the door-type steel frame outside sets up the individual layer reinforcing bar net, like 8 mm's diameter HPB300 reinforcing bar, interval 200mm, and the inside and outside of door-type steel frame all sets up vertical drawknot muscle, and the diameter is 20mm, interval 1m, and the drawknot muscle welds on the door-type steel frame, and vertical drawknot muscle connects and adopts single face lap welding, overlap joint length 10 d.
Step five: the concrete surface floating dust is broken through by cleaning, a groove is reserved on the surface of the residual concrete, water swelling water stop bars are reserved for applying conditions, steel bar derusting of the original side wall is carried out, new HRB400 steel bars with d being 25mm are used for replacing steel bars in the original bent side wall, intact concrete protective layers with original intact ranges 102 needing chiseling at two ends are removed, the removing range meets the conditions that the new steel bars are reliably welded with the original steel bars (single-side welding is carried out for 10d or double-side welding is carried out for 5d) and nodes are staggered by 50%, the bent steel bars are cut off, welding conditions of the new steel bars are reserved, the new steel bars are welded with the original steel bars, and the peripheral steel bar welding points 1021 are formed.
Step six: erecting two vertical upright posts 14 in the side walls, wherein the size of the upright posts is 25b of I-shaped steel, the distance between the upright posts is 1m, and the size of the upright posts is cut to be proper length according to the actual situation on site.
Step seven: and after the erection is finished, repeating the step I-1 to finish the temporary support of the sections I-2 and I-3.
Step eight: and applying a water-swellable adhesive tape, coating an interface agent, reserving the vertical upright post, and then pouring the I-section side wall by adopting C40 micro-swelling concrete.
Step nine: and repeating the steps from the second step to the eighth step, finishing construction of odd sections and even sections at intervals, namely finishing construction of odd sections I (I-1, I-2 and I-3), III (III-1, III-2 and III-3) and V (V-1, V-2 and V-3), and then performing construction of even sections II (II-1, II-2 and II-3) and IV (IV-1, IV-2 and IV-3).
Step ten: a layer is stuck on the whole surface
The steel bar mesh is then leveled by using high-strength polymer mortar.
Therefore, the method is suitable for the condition that the defects of the side wall of the underground structure are serious and replacement treatment is needed, the side wall is protected to be opened before replacement, the soil outside the side wall damages the remaining cantilever structure of the side wall, the construction risk is avoided, a set of comprehensive supporting system is adopted, and a traditional comprehensive grouting method combining grouting and mold bag grouting is adopted before replacement of the side wall to ensure that the construction risk is caused by collapse of the soil behind the side wall.
The invention is already applied to the case of replacing the defect of the side wall of the platform layer of the Qingdao station 16-20 axle station of the No. 1 line engineering of the subway in Qingdao city, the Qingdao No. M1 line Qingdao station is built in the 90 th century, the Qingdao station is transformed by the existing No. 1 line integral construction, the 16-20 axle side wall back soil layer is drilled and sampled in the process, and the condition that the stratum behind the side wall is uncovered is as follows: 3 drill holes at the position 3m away from the top of the bottom plate are cored to display that the geology behind the side wall is poor, and the backfilled cohesive soil and the construction waste are taken as main materials. The self condition of the side wall is identified and disclosed: the concrete strength of the lower part of the 16-20 shaft wall body is lower and basically reaches C20, and the serious area is lower than that of C20 and is far lower than the original design strength C30. Meanwhile, the bottom of the wall body in the range is hollowed and cracked at a position of about 0.5 meter in the vertical direction, concrete at the lower part is loose and easy to fall off, yellow foam sticky objects, cement bags and other construction wastes exist in the wall body, serious material defects exist, and the wall penetrates through the wall thickness.
It should be apparent that the foregoing description and illustrations are by way of example only and are not intended to limit the present disclosure, application or uses. While embodiments have been described in the embodiments and depicted in the drawings, the present invention is not limited to the particular examples illustrated by the drawings and described in the embodiments as the best mode presently contemplated for carrying out the teachings of the present invention, and the scope of the present invention will include any embodiments falling within the foregoing description and the appended claims.
Claims (7)
1. A complete replacement method for treating side wall defects is characterized by comprising the following steps:
the method comprises the following steps of firstly, determining the defect range of the side wall, erecting a temporary support made of I-shaped steel, wherein the side wall is provided with original side wall vertical reinforcing steel bars and original side wall horizontal reinforcing steel bars, and determining the original intact range needing chiseling at the periphery of the defect range;
step two: a grouting pipe and a mold bag grouting pipe are arranged, and grouting and mold bag grouting are carried out through the grouting pipe and the mold bag grouting pipe so as to reinforce the grouting range of the stratum behind the side wall;
step three: removing the I-1 section of loose concrete, and chiseling the concrete in the overlap joint range of the new and old reinforcing steel bars;
step four: excavating a primary support range behind the side wall, performing anchor spraying, net hanging and portal steel frame erection to complete soil body support below the mold bag and behind the side wall, cutting off steel pipes inside the mold bag within the thickness range of the side wall, supporting the mold bag steel pipes on the portal steel frame, and completing the fulcrum conversion inside the mold bag;
step five: cleaning and breaking concrete surface floating dust, reserving a groove on the surface of the rest concrete, reserving a water-swelling water stop strip as a condition, derusting the reinforcing steel bars of the original side wall, replacing the reinforcing steel bars in the original bent side wall with new reinforcing steel bars, and removing intact concrete protective layers with original intact ranges at two ends needing chiseling;
step six: erecting two vertical upright posts in the side walls;
step seven: after the erection is finished, repeating the step I-1 to finish the temporary support of the sections I-2 and I-3;
step eight: and applying a water-swelling adhesive tape, coating an interface agent, reserving the vertical upright post, and pouring the I-section side wall.
2. The complete replacement method for treating the defects of the side wall as claimed in claim 1, wherein the complete replacement method comprises the following steps: the upper end of the temporary support is anchored to the side wall through the upper steel plate and the upper anchor bolts to exceed the position above the original intact chiseling-out range, and the lower end of the temporary support is anchored to the bottom plate through the lower steel plate and the lower anchor bolts.
3. The complete replacement method for treating the defects of the side wall as claimed in claim 1, wherein the complete replacement method comprises the following steps: the horizontal mould bag pivot is based on a structural wall, and the vertical mould bag grouting mainly plays a role in isolating the stratum and the existing side wall structure, and grouting is vertically performed within a range of 2m and 3m from the bottom of the bottom plate to the outside of the overlap joint range of the new and old defective concrete reinforcing steel bars.
4. The complete replacement method for treating the defects of the side wall as claimed in claim 1, wherein the complete replacement method comprises the following steps: the grouting material is made of superfine cement, the water cement ratio is 1:1, and the grouting pressure is 0.5-1 MPa.
5. The complete replacement method for treating the defects of the side wall as claimed in claim 1, wherein the complete replacement method comprises the following steps: the outer side of the portal frame is provided with a reinforcing mesh, and the inner side and the outer side of the portal frame are both provided with longitudinal tie bars.
6. The complete replacement method for treating the defects of the side wall as claimed in claim 1, wherein the complete replacement method comprises the following steps: further comprises the ninth step: and repeating the steps from the second step to the eighth step, and finishing the construction of the odd-numbered section and the even-numbered section at intervals.
7. The complete replacement method for treating the defects of the side wall as claimed in claim 6, wherein: further comprising the step of ten: and sticking a layer of reinforcing mesh on the whole surface, and then leveling by adopting high-strength polymer mortar.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110331038.7A CN113006139A (en) | 2021-03-26 | 2021-03-26 | Complete replacement method for treating side wall defects |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110331038.7A CN113006139A (en) | 2021-03-26 | 2021-03-26 | Complete replacement method for treating side wall defects |
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| CN111456756A (en) * | 2020-04-10 | 2020-07-28 | 中国建筑第七工程局有限公司 | Collapsible loess tunnel primary support arch changing construction method |
| CN111560941A (en) * | 2020-05-12 | 2020-08-21 | 中铁二十局集团第三工程有限公司 | Karst landform cavity treatment method |
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2021
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| US6074132A (en) * | 1996-04-06 | 2000-06-13 | Hanson Quarry Products Europe Limited | Lining for a landfill site |
| CN207063981U (en) * | 2017-03-29 | 2018-03-02 | 清华海峡研究院（厦门） | A kind of underground mould bag stake suspension device |
| CN107391841A (en) * | 2017-08-03 | 2017-11-24 | 中铁十局集团第五工程有限公司 | Close on the safe construction method in the newly-built left and right tunnel in existing disease tunnel |
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