CN110552540A - construction method of inverted retaining wall supporting structure of cyclone tank adjacent to existing building - Google Patents
construction method of inverted retaining wall supporting structure of cyclone tank adjacent to existing building Download PDFInfo
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- CN110552540A CN110552540A CN201910729675.2A CN201910729675A CN110552540A CN 110552540 A CN110552540 A CN 110552540A CN 201910729675 A CN201910729675 A CN 201910729675A CN 110552540 A CN110552540 A CN 110552540A
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- retaining wall
- construction
- pool
- existing building
- supporting structure
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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
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H7/00—Construction or assembling of bulk storage containers employing civil engineering techniques in situ or off the site
- E04H7/02—Containers for fluids or gases; Supports therefor
- E04H7/18—Containers for fluids or gases; Supports therefor mainly of concrete, e.g. reinforced concrete, or other stone-like material
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- General Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Bulkheads Adapted To Foundation Construction (AREA)
Abstract
the invention relates to a construction method of a spiral-flow pool inverse-hanging retaining wall supporting structure next to an existing building, which comprises the steps of measurement and setting-out, construction section division, earthwork excavation, soil nail construction, retaining wall steel bar binding, retaining wall template erection, retaining wall structure concrete pouring, template dismantling, upper and lower channel installation, retaining wall pool bottom construction and the like. The rotational flow pool adopts a support mode of upside-down hanging concrete retaining walls and soil nails, has short construction period and low cost, reasonably divides the support structure of the rotational flow pool retaining walls into a plurality of construction sections, and performs construction section by section, has little influence on adjacent buildings, and is safe and reliable.
Description
Technical Field
The invention relates to metallurgical engineering construction, in particular to a construction method of a spiral flow tank inverted retaining wall supporting structure adjacent to an existing building.
background
the cyclone tank is a core facility for efficiently recycling and circularly utilizing wastes in the production process of steel rolling and continuous casting steel industry. The cyclone pool is a cast-in-place reinforced concrete circular structure and consists of a bottom plate, an outer cylinder, an inner cylinder (steel structure) and three layers of cast-in-place reinforced concrete platforms. Generally, a support structure such as an underground continuous wall or a construction method such as an open caisson is generally adopted in the cyclone tank, wherein the underground continuous wall has long construction period, large investment and wide environmental influence range, and the open caisson construction is not suitable for the cyclone tank construction next to the existing structures. Concrete inverted retaining walls are a supporting structure that combines underground continuous walls with a reverse construction method, but are less applicable in construction of a whirlpool next to existing buildings.
disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a construction method of a swirling flow pool inverted retaining wall supporting structure adjacent to the existing building, and realizes safe and efficient construction of the swirling flow pool inverted retaining wall.
In order to achieve the aim, the invention provides a construction method of a wall-protecting supporting structure which is closely adjacent to a rotational flow pool of an existing building and hung upside down, which comprises the following steps:
1) And (3) measurement and paying-off: carrying out pile position measurement and paying-off according to the drawing size, building a corresponding pile guard ring after checking is error-free, and marking a pile center cross line on the guard ring;
2) Construction section division: dividing the retaining wall construction into a plurality of construction sections, wherein each construction section comprises a fore shaft beam, a waist beam and a retaining wall structure, the first construction section at the top is the fore shaft beam, the retaining wall structure is arranged between the fore shaft beam and the waist beam and between the waist beams, and the last section of the construction section is the retaining wall structure;
3) earth excavation: excavating earthwork and transporting away muck in time;
4) And (3) soil nail construction: arranging reinforcing steel bars at certain intervals in the horizontal direction and the vertical direction to serve as soil nails, wherein a certain inclination angle between the soil nails and a soil layer is controlled in the construction process;
5) and (3) binding of wall protection reinforcing steel bars: the retaining wall steel bars adopt the operation methods of pre-blanking and under-pit binding, and the vertical steel bars between the two layers of retaining walls are fixedly connected;
6) Erecting a protecting wall template: the wall protection template is made of steel plates, the specifications of each arc plate are the same, one steel plate is welded at each of the upper end and the lower end of each arc plate as a horizontal stiffening rib, an angle steel is welded at each of the left end and the right end of each arc plate, a plurality of angle steels are welded in the middle of each arc plate as a vertical stiffening rib, and steel pipe opposite bracing is adopted for circular control of the wall protection template;
7) And (3) concrete pouring of the retaining wall structure: the concrete with the wall protection structure is vertically transported by utilizing a stringing barrel, a circular protection plate is used as a material distribution table, the concrete is symmetrically poured to prevent the template from laterally moving, an embedded part for welding the vertical ladder stand is arranged during pouring, and the concrete is manually tamped in layers;
8) removing the template: and (3) after the retaining wall concrete is poured for not less than 24 hours, removing the formwork, hanging the steel wire rope by removing the formwork, and integrally hanging the steel wire rope to the position of the lower-section retaining wall by using the single-beam crane.
9) Installing an upper channel and a lower channel: the vertical ladder stand is welded on an embedded part of the retaining wall structure and used as an upper channel and a lower channel, and the upper channel and the lower channel can be used only after the strength of the retaining wall structure is qualified;
10) Repeating the step 3) to the step 9), and constructing according to the construction sections from top to bottom until all the construction sections are completely constructed; the lower layer excavation can be carried out after the strength of the upper layer retaining wall concrete reaches over 75 percent, and the retaining wall structure cannot be damaged when the excavation is carried out;
11) And (3) constructing the bottom of the retaining wall pool: and (4) after the retaining wall pool bottom is designed and excavated to the elevation and is checked and accepted to be qualified, pouring a concrete cushion layer, and delivering the main structure of the rotational flow pool for construction.
Further, in the step 2), the height of the fore shaft beam is the same as that of the waist beam and is smaller than that of the retaining wall structure, and the height of the retaining wall structure at the lowest section is lower than that of other retaining wall structures.
Further, in the step 6), a plurality of bolt holes are formed in the horizontal stiffening rib, and bolts penetrate into the bolt holes to realize the connection of the upper and lower retaining wall templates.
further, in the step 8), the connecting bolts are firstly removed during form removal, then the template is pried, the template is removed by matching with a jack, the removed template is cleaned in time, and the deformed template is repaired in time.
further, in the step 3), mechanical excavation and manual cooperation are adopted to excavate earthwork, and the small excavator is hoisted into the pit by a crane to excavate soil.
further, in the step 3), the vertical transportation of the excavated dregs is carried out by adopting a single-beam crane matched with a hopper for hoisting, the single-beam crane hoisting equipment can be put into use after being detected to be qualified, and after each construction section earthwork is excavated, the central position and the aperture deviation must be checked according to the cross line of the pool center.
Further, in the step 4), the inclination angle of the soil nails and the soil layer is controlled to be 12-20 degrees in the construction process.
further, in the step 4), before the soil nails are installed, oil stains and soil on the surface of the soil nails must be removed.
Further, the vertical steel bars between the two layers of the protecting walls in the step 5) are fixedly connected by adopting single-side welding.
further, in the step 9), the upper and lower channels must be used after the strength of the retaining wall structure reaches 20 MPa.
The rotational flow pool adopts a support mode of upside-down hanging concrete retaining walls and soil nails, has short construction period and low cost, reasonably divides the support structure of the rotational flow pool retaining walls into a plurality of construction sections, and performs construction section by section, has little influence on adjacent buildings, and is safe and reliable.
drawings
FIG. 1 is a horizontal schematic view of a supporting structure of an inverted retaining wall of a cyclone pool;
FIG. 2 is a schematic cross-sectional view of a wall-protecting supporting structure A-A of the inverted cyclone pool;
FIG. 3 is a horizontal view of the construction of the form for retaining wall construction;
FIG. 4 is a schematic sectional view of a form B-B for retaining wall construction.
Detailed Description
in order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the following embodiments are specifically described with reference to the attached drawings. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
As shown in fig. 1 and fig. 2, in the embodiment, before construction, pile position measurement and pay-off are carried out according to the drawing size, and after checking and error proofing are carried out, pile guard rings with the height of 200mm and the thickness of 240mm are built by red bricks, and pile center cross lines are marked on the guard rings; the wall protection construction is divided into 14 construction sections, wherein the first construction section is a fore shaft beam 1-1, the fifth and ninth construction sections are waist beams 1-3, the rest construction sections are wall protection structures 1-2, the fore shaft beam 1-1 and the waist beams 1-3 are 1000mm high, the last section of arm protection structure 1-4 is 1300mm high, and the rest arm protection structures 1-2 are 1500mm high.
And after the retaining wall construction division is finished, earth excavation is carried out from top to bottom, mechanical excavation and manual cooperation are adopted to excavate earth, and the small excavator is hoisted into the pit by a crane to excavate earth. The vertical transportation of the excavated dregs adopts the single-beam crane matched with a hopper of 0.8-1.5m3 for hoisting, and the hoisting equipment of the single-beam crane can be put into use only after being detected to be qualified. After each construction section earthwork is dug, the center position and the aperture deviation must be checked according to the pool center cross line suspension wire. After the earthwork excavation is finished, the construction of the soil nails 2 is carried out, reinforcing steel bars with the length of 2450 plus 2550mm and the diameter of phi 22 are adopted, the horizontal and vertical intervals are 1500mm and are used as the soil nails 2, surface oil stains and soil must be removed before the soil nails 2 are installed, and the inclination angle of the soil nails 2 and the soil layer is controlled to be 14-16 degrees in the construction process.
after the soil nails 2 are arranged, the wall protection reinforcing steel bars are bound. The wall protection reinforcing steel bars adopt the operation methods of pre-blanking and under-pit binding, and the vertical reinforcing steel bars between the two layers of the wall protection are connected by single-side welding. The method comprises the following steps of setting up a wall protection template after wall protection steel bars are bound, wherein the wall protection template is made of Q235B steel plates with the thickness of 4mm, each arc plate is 4-1 and 1.5m long and 1.5m high, one steel plate with the thickness of 100 x 20mm is welded at the position 80-120mm away from the upper end and the lower end of the arc plate 4-1 respectively to serve as a horizontal stiffening rib 4-4, angle steel 4-2 with the diameter of 60 x 6mm is welded at the left end and the right end of the arc plate respectively, and 4 angle steel 4-3 with the diameter of 50 x 5mm is welded in the middle to serve as a vertical stiffening rib. 4 bolt holes 4-5 are arranged on the horizontal stiffening rib, and M16 and 8.8-grade high-strength bolts penetrate through the bolt holes to realize the connection of the upper and lower retaining wall templates. And the circular control of the retaining wall template adopts steel pipe counter-bracing.
And after the retaining wall formwork is erected, concrete pouring of the retaining wall structure is started. The retaining wall structure concrete utilizes the cluster bucket vertical transportation, uses circular guard plate as the cloth platform, and the symmetry concreting prevents that the template side from moving, and the concrete adopts artifical tamping, and layering thickness 100-. When the concrete of the retaining wall structure is poured, embedded parts for welding and manufacturing the vertical ladder are embedded.
and (3) removing the formwork after the dado concrete is poured for not less than 24 hours, removing the connecting bolt firstly during formwork removal, prying the formwork, and removing the formwork by using a 10t jack in a matching manner. The detached template hanging steel wire rope is integrally hung to the position of the lower section of the protecting wall by a single-beam crane. The detached templates should be cleaned in time and the deformed templates should be trimmed in time. After the template is dismantled, a vertical ladder stand is welded on an embedded part of the retaining wall structure to be used as an upper channel and a lower channel, and the upper channel and the lower channel can be used only after the strength of the retaining wall structure reaches 20 MPa.
And repeating the operation until all the 14 construction sections are constructed, and performing lower layer excavation after the strength of the upper layer retaining wall concrete reaches over 75 percent. And after the concrete is excavated to the elevation and is checked and accepted to be qualified, pouring a concrete cushion and delivering the main structure of the rotational flow pool for construction.
The above embodiments are preferred examples of the present invention, and are not intended to limit the scope of the present invention.
Claims (10)
1. A construction method of a wall-protecting supporting structure of a whirling pool which is close to an existing building and hung upside down is characterized by comprising the following steps:
1) and (3) measurement and paying-off: carrying out pile position measurement and paying-off according to the drawing size, building a corresponding pile guard ring after checking is error-free, and marking a pile center cross line on the guard ring;
2) construction section division: dividing the wall protection construction into a plurality of construction sections, wherein each construction section comprises a fore shaft beam (1-1), a waist beam (1-3) and a wall protection structure (1-2), the first construction section at the top is the fore shaft beam (1-1), the wall protection structure (1-2) is arranged between the fore shaft beam (1-1) and the waist beam (1-3), and between the waist beam (1-3) and the waist beam (1-3), and the last section of the construction section is the wall protection structure (1-2);
3) Earth excavation: excavating earthwork and transporting away muck in time;
4) And (3) soil nail construction: arranging steel bars at certain intervals horizontally and vertically to serve as soil nails (2), wherein a certain inclination angle between the soil nails (2) and a soil layer is controlled in the construction process;
5) and (3) binding of wall protection reinforcing steel bars: the retaining wall steel bars adopt the operation methods of pre-blanking and under-pit binding, and the vertical steel bars between the two layers of retaining walls are fixedly connected;
6) Erecting a protecting wall template: the wall protection template is made of steel plates, each arc plate (4-1) is the same in specification, one steel plate is welded at each of the upper end and the lower end of each arc plate (4-1) away from the arc plate to serve as a horizontal stiffening rib (4-4), angle steel is welded at each of the left end and the right end of each arc plate (4-1), a plurality of angle steel are welded in the middle of each arc plate to serve as vertical stiffening ribs (4-2), and steel pipes are adopted for opposite bracing in circular control of the wall protection template;
7) and (3) concrete pouring of the retaining wall structure: the concrete with the wall protection structure is vertically transported by utilizing a stringing barrel, a circular protection plate is used as a material distribution table, the concrete is symmetrically poured to prevent the template from laterally moving, an embedded part for welding the vertical ladder stand is arranged during pouring, and the concrete is manually tamped in layers;
8) removing the template: and (3) after the retaining wall concrete is poured for not less than 24 hours, removing the formwork, hanging the steel wire rope by removing the formwork, and integrally hanging the steel wire rope to the position of the lower-section retaining wall by using the single-beam crane.
9) Installing an upper channel and a lower channel: the vertical ladder stand is welded on an embedded part of the retaining wall structure and used as an upper channel and a lower channel, and the upper channel and the lower channel can be used only after the strength of the retaining wall structure is qualified;
10) Repeating the step 3 to the step 9, and constructing according to the construction sections from top to bottom until all the construction sections are completely constructed; the lower layer excavation can be carried out after the strength of the upper layer retaining wall concrete reaches over 75 percent, and the retaining wall structure cannot be damaged when the excavation is carried out;
11) And (3) constructing the bottom of the retaining wall pool: and (3) after the retaining wall pool bottom is designed and excavated to the elevation and is checked and accepted to be qualified, pouring a concrete cushion layer (1-5), and delivering the rotational flow pool main body structure for construction.
2. The construction method of the whirling pool inverted retaining wall supporting structure next to the existing building according to claim 1, wherein in the step 2), the height of the fore shaft (1-1) and the waist beam (1-3) is the same and is less than that of the retaining wall structure (1-2), and the height of the retaining wall structure (1-4) at the lowest section is lower than that of other retaining wall structures (1-2).
3. The construction method of the inverted retaining wall supporting structure of the rotational flow pool next to the existing building according to claim 1, wherein in the step 6), a plurality of bolt holes (4-5) are formed in the horizontal stiffening rib (4-4), and bolts are inserted into the bolt holes (4-5) to connect the upper retaining wall formwork and the lower retaining wall formwork.
4. The construction method of a spiral flow tank inverse-hanging dado supporting structure next to the existing building as claimed in claim 3, wherein in the step 8), the connecting bolts are firstly removed when the formwork is removed, then the formwork is pried, the formwork is removed by matching with the lifting jack, the removed formwork is cleaned in time, and the deformed formwork is repaired in time.
5. the construction method of the inverted retaining wall supporting structure of the whirling pool adjacent to the existing building as claimed in claim 1, wherein in the step 3), mechanical excavation and manual cooperation excavation are adopted, and a small excavator is hoisted into the pit by a crane to dig earth.
6. The construction method of a spiral-flow pool inverted retaining wall supporting structure next to an existing building according to claim 1 or 5, wherein in the step 3), the excavated muck is vertically transported by a single-beam crane matched with a hopper to be hoisted, the single-beam crane hoisting equipment is put into use after being detected to be qualified, and after each construction section is excavated, the central position and aperture deviation must be checked according to a pool center cross line hoisting line.
7. The construction method of the whirling pool inverse hanging dado supporting structure next to the existing building according to claim 1, characterized in that in the step 4), the inclination angle of the soil nails (2) and the soil layer is controlled to be 12-20 degrees in the construction process.
8. The construction method of the whirling pool inverted retaining wall supporting structure next to the existing building as claimed in claim 1 or 7, wherein in the step 4), before the soil nails (2) are installed, surface oil stains and soil must be removed.
9. The construction method of the inverted hanging retaining wall supporting structure of the rotational flow pool next to the existing building as claimed in claim 1, wherein the vertical steel bars between the two retaining walls in the step 5) are fixedly connected by single-side welding.
10. The method for constructing a spiral flow pool inverted retaining wall supporting structure next to an existing building according to claim 1, wherein in the step 9), the upper and lower passages must be used after the strength of the retaining wall structure reaches 20 MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910729675.2A CN110552540A (en) | 2019-08-08 | 2019-08-08 | construction method of inverted retaining wall supporting structure of cyclone tank adjacent to existing building |
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| CN201910729675.2A CN110552540A (en) | 2019-08-08 | 2019-08-08 | construction method of inverted retaining wall supporting structure of cyclone tank adjacent to existing building |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114263186A (en) * | 2021-12-27 | 2022-04-01 | 中铁二十局集团第五工程有限公司 | Reverse arch ring supporting method for water-rich area near existing line |
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Application publication date: 20191210 |