CN111456085A - Cast-in-place concrete construction method for pipe gallery segment - Google Patents
Cast-in-place concrete construction method for pipe gallery segment Download PDFInfo
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- CN111456085A CN111456085A CN202010276765.3A CN202010276765A CN111456085A CN 111456085 A CN111456085 A CN 111456085A CN 202010276765 A CN202010276765 A CN 202010276765A CN 111456085 A CN111456085 A CN 111456085A
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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
- E02D29/10—Tunnels or galleries specially adapted to house conduits, e.g. oil pipe-lines, sewer pipes ; Making conduits in situ, e.g. of concrete ; Casings, i.e. manhole shafts, access or inspection chambers or coverings of boreholes or narrow wells
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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
- 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
- E02D31/025—Draining membranes, sheets or fabric specially adapted therefor, e.g. with dimples
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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
- E02D2250/0007—Production methods using a mold
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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
- E02D2300/0001—Rubbers
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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
- E02D2300/002—Concrete
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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
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- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
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Abstract
The invention relates to a cast-in-place concrete construction method for a pipe gallery segment. The method comprises the following steps of (1) carrying out concrete cushion construction on a foundation of a foundation pit obtained by excavation; (2) waterproof construction is carried out on the concrete cushion and the structural side wall; (3) binding the steel reinforcement frameworks of the bottom plates and part of the side walls of the pipe gallery sections, installing part of side wall templates, and pouring concrete to obtain the bottom plates and part of the side walls of the pipe gallery sections; (4) binding a side wall steel reinforcement framework of the pipe gallery segment, installing a side wall template, arranging a support at the inner side of the side wall template, and pouring concrete to obtain the side wall of the pipe gallery segment; (5) installing a beam template and a top plate template of the pipe gallery segment, binding steel bar frameworks of the beam and the top plate, and pouring concrete to obtain a beam and top plate combination of the pipe gallery segment; (6) and carrying out waterproof construction on the top plate of the pipe gallery segment. According to the invention, the concrete cushion is obtained by constructing the foundation pit and the multi-position waterproof construction is carried out on the pipe gallery segments, so that the deformation resistance and the waterproof capability of the pipe gallery segments are improved.
Description
Technical Field
The invention belongs to the technical field of comprehensive pipe gallery construction methods, and particularly relates to a cast-in-place concrete construction method for a pipe gallery segment.
Background
The utility tunnel is an underground city pipeline utility tunnel, namely constructs a tunnel space underground the city, collects various engineering pipelines such as electric power, communication, gas, heat supply, water supply and drainage in an organic whole, is equipped with special access hole, hoist and mount mouth and monitoring system, implements unified planning, unified design, unified construction and management, is important infrastructure and lifeline of guarantee city operation. The utility tunnel system not only solves the problem of urban traffic jam, but also greatly facilitates the maintenance and overhaul of municipal facilities such as electric power, communication, gas, water supply and drainage and the like. The utility tunnel plays an important role in meeting the basic demands of the civilian life and improving the comprehensive bearing capacity of the city. The underground comprehensive pipe gallery is constructed to avoid influence and interference on traffic and resident trip caused by frequent excavation of roads by laying and maintaining underground pipelines, and the road appearance is kept complete and attractive. The cost of repeated repair of the road surface and the maintenance cost of the engineering pipeline are reduced. The integrity of the pavement and the durability of various pipelines are maintained. Is convenient for laying, increasing, decreasing, maintaining and daily managing various pipelines. Because the pipeline arrangement is compact reasonable in the ditch, effectively utilized the space under the road, practiced thrift urban land. Because the number of the posts of the road and the inspection wells, rooms and the like of various pipelines are reduced, the urban landscape is beautiful. Because the overhead pipelines enter the ground together, the contradiction between the overhead pipelines and the greening is reduced. Therefore, the planning and construction work of the underground comprehensive pipe gallery is paid increasing attention at present.
The cross-section of utility tunnel is the rectangle shape generally, is concrete molding structure. In the prior art, a concrete cast-in-place construction process or a construction process of prefabricating pipe gallery segments and hoisting the prefabricated pipe gallery segments into an excavated foundation pit for assembly is generally adopted, and the cast-in-place construction process is used in many cases. In the cast-in-place construction process of the pipe gallery, a large number of templates need to be used on site, and scaffold facilities are built to provide reliable support for the templates.
Considering the underground environment that utility tunnel is located, the deformation resistance ability and the waterproof ability of preapring for an unfavorable turn of events after the construction are the problem that needs the key consideration. The former is used for guaranteeing that utility tunnel does not produce when the topography takes place to subside, warp scheduling problem and destroys, can understand that the piping lane should possess certain anti-seismic performance. The later is used for blocking the infiltration of water in the soil horizon to the piping lane in, promotes utility tunnel's life-span when guaranteeing the pipe lane internal environment to waterproof of construction joint (including post-cast strip), deformation joint position is the key point. The existing cast-in-place construction process has the defects that the deformation resistance and the waterproof capability of the underground comprehensive pipe gallery cannot meet the requirements, and the cast-in-place construction method of the pipe gallery segments needs to be optimized.
Disclosure of Invention
The invention provides a cast-in-place concrete construction method for a pipe gallery segment to solve the technical problems in the prior art, and the deformation resistance and the waterproof capability of the pipe gallery segment are improved.
The technical scheme adopted by the invention for solving the technical problems in the prior art is as follows: a cast-in-place concrete construction method of a pipe gallery segment comprises the following steps of (1) carrying out concrete cushion construction on a foundation pit base obtained by excavation; (2) waterproof construction is carried out on the concrete cushion and the structural side wall; (3) binding the steel reinforcement frameworks of the bottom plates and part of the side walls of the pipe gallery sections, installing part of side wall templates, and pouring concrete to obtain the bottom plates and part of the side walls of the pipe gallery sections; (4) binding a side wall steel reinforcement framework of the pipe gallery segment, installing a side wall template, arranging a support at the inner side of the side wall template, and pouring concrete to obtain the side wall of the pipe gallery segment; (5) installing a beam template and a top plate template of the pipe gallery segment, binding steel bar frameworks of the beam and the top plate, and pouring concrete to obtain a beam and top plate combination of the pipe gallery segment; (6) and carrying out waterproof construction on the top plate of the pipe gallery segment.
The invention has the advantages and positive effects that: the invention provides a cast-in-place concrete construction method for a pipe gallery segment, which is used for constructing in a foundation pit by adopting a segmented cast-in-place process to obtain the pipe gallery segment. Concrete cushion is carried out in advance through the basement at the foundation ditch, has promoted the structural strength of foundation ditch basement, and utility tunnel festival section is under construction on concrete cushion and is obtained, has consequently strengthened the intensity of utility tunnel department's foundation ditch internal environment, has guaranteed the stability of construction and later stage utility tunnel structure, has promoted the antidetonation and has just also resisted the ability that soil deformation leads to the structural damage. Waterproof construction is done through bottom, both sides and the top at the piping lane festival section, has promoted the waterproof ability of piping lane festival section, has guaranteed the environment in the utility tunnel and has promoted utility tunnel's life-span simultaneously.
Preferably: the concrete structure cushion layer construction in the step (1) comprises the steps of 1) inspecting a groove of a foundation pit, cleaning up floating soil on the surface of the foundation pit, enabling elevation and surface flatness to meet design requirements and standard regulations, carrying out sectional groove inspection according to a program, carrying out foundation treatment on found soil layers which do not meet the design requirements according to the opinions of design units, and after the treatment is finished, asking a supervision unit to accept inspection and handling hidden inspection records; 2) retesting and measuring lofting, retesting the size and the position deviation of the foundation pit excavation after the foundation pit excavation is finished, wherein the size and the position deviation of the foundation pit excavation should meet the construction and specification requirements; 3) the method comprises the following steps of (1) formwork erecting and elevation retest, wherein a wood beam is used as a side formwork of the engineering cushion formwork and is kept stable, and a level gauge is used for retesting the elevation so as to prevent elevation errors after the cushion is poured; 4) and (3) constructing cushion concrete, wherein the cushion layer adopts C15 plain concrete with the thickness of 100mm, and the cushion layer concrete is required to be maintained in time after the construction is finished so as not to cause shrinkage cracks in the concrete.
Preferably: the waterproof construction of the concrete cushion in the step (2) comprises the steps of 1) leveling the surface of the concrete cushion by adopting self-waterproof concrete; 2) paving a waterproof layer on the concrete cushion layer, wherein the waterproof layer comprises a dry-laid felt with the thickness of 3mm, a polyethylene polypropylene coiled material with the thickness of 0.8mm and a polyester non-woven fabric isolating layer; 3) and (3) applying a C20 fine-stone concrete protective layer on the surface of the waterproof layer.
Preferably: the step (2) of waterproof construction of the structure side wall comprises the steps of 1) leveling the inner vertical surface of the structure side wall by adopting self-waterproof concrete; 2) applying a waterproof layer on the inner vertical surface of the leveled structure side wall, wherein the waterproof layer comprises a single-layer polyester tire polymer modified asphalt single-sided self-adhesive coiled material with the thickness of 3mm and an rubberized asphalt non-cured waterproof coating with the thickness of 2 mm; 3) and tamping plain soil outside the side wall of the structure.
Preferably: and (4) the height of the partial side wall poured in the step (3) is 10-15% of the total height of the side wall of the pipe gallery segment.
Preferably: and (4) installing an embedded fastener on the bottom plate obtained in the step (3) before the side wall template is installed, fixedly connecting the support of the side wall template with the embedded fastener, and checking the connection condition of the support and the embedded fastener before pouring to ensure that slurry does not leak from the bottom of the side wall template.
Preferably: integrally pouring a vertical water stop steel plate at the center of the top of part of the side wall when the part of the side wall is poured in the step (3), and integrally pouring the water stop steel plate in the side wall when the side wall is poured in the step (4); and a waterproof coiled material reinforcing layer is arranged on the outer side between the top of part of the side wall and the bottom of the side wall.
Preferably: the waterproof construction of the top plate in the step (6) comprises the steps of 1) leveling the outer plane of the top plate by adopting self-waterproof concrete; 2) applying a waterproof layer on the inner vertical surface of the leveled structure side wall, wherein the waterproof layer comprises a single-layer polyester tire polymer modified asphalt single-sided self-adhesive coiled material with the thickness of 3mm, an rubberized asphalt non-cured waterproof coating with the thickness of 2mm and a polyester non-woven fabric isolating layer; 3) and (3) applying a C20 fine-stone concrete protective layer on the surface of the waterproof layer.
Preferably: the method also comprises the steps of waterproof construction of the internal corner of the bottom plate and the external corner construction of the top plate; the construction of the internal corner of the bottom plate comprises the step of arranging a waterproof coiled material reinforcing layer at the position corresponding to the internal corner of the bottom plate in the step (2), wherein the edges of two sides of the waterproof coiled material reinforcing layer are respectively bonded and sealed with a waterproof layer on a concrete cushion layer and a waterproof layer on a structural outer wall by polysulfide sealant; and (3) the construction of the external corner of the top plate comprises the step of arranging a waterproof coiled material reinforcing layer at the position corresponding to the external corner of the top plate in the step (6), wherein the edges of two sides of the waterproof coiled material reinforcing layer are respectively bonded and sealed with a waterproof layer on the top plate and a waterproof layer on a structural outer wall by polysulfide sealant.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are described in detail as follows:
the cast-in-place concrete construction method of the pipe gallery segment comprises the following steps,
step (1), performing concrete cushion construction on a foundation of the foundation pit obtained by excavation;
the construction method of the structural cushion comprises the steps of groove inspection of the foundation pit, retesting and measurement lofting, formwork support and elevation retest and concrete pouring of the cushion.
Specifically, the concrete structure cushion layer construction in this step is as follows,
1) foundation pit inspection groove
A. And cleaning up the floating soil on the surface of the foundation pit, wherein the elevation and the surface flatness meet the design requirements and the specification. And (4) carrying out sectional inspection according to the program, carrying out foundation treatment on the found soil layer which does not meet the design requirement according to the suggestion of the design unit, and after the treatment is finished, asking the supervision unit to accept and transact the hidden inspection record.
B. And checking whether the position, the number and the plane size of the sump tank conform to the design or not by contrasting a drawing.
C. As the engineering foundation pit has multiple supporting modes, the grooves are tested in sequence according to the working surfaces provided by side slope supporting and earthwork excavation so as to save the construction period.
2) Retesting and measurement lofting
And after the foundation pit is excavated, retesting the size and the position deviation of the excavation of the foundation pit, wherein the size and the position deviation of the excavation of the foundation pit must meet the requirements of construction and specification. The boundary line and elevation of the cushion layer can be measured and lofted according to the construction drawing.
3) Formwork supporting and elevation rechecking
The engineering cushion layer template adopts wood beams as side molds and keeps the stability of the side molds. And (4) retesting the elevation by using the level gauge to prevent the elevation from being wrong after the cushion layer is poured.
4) Concrete pouring of bedding
A. The cushion layer adopts C15 plain concrete, and the thickness is 100 mm.
B. The concrete at the construction stage of the cushion layer adopts a fixed concrete delivery pump, and delivery pump pipes are erected according to the pouring sequence when the cushion layer is poured.
C. And (3) operating according to a section of 30m, setting a contraction joint, pumping concrete by using a conveying pump, manually paving, and tamping by using a flat plate vibrator.
D. And after the cushion concrete is constructed, the smooth, clean and dry surface of the cushion concrete is ensured, and then the waterproof mortar leveling layer is constructed on the surface of the cushion concrete according to the design requirement. And paying off and dividing construction according to the width of 3.0m when the mortar is coated, and carrying out 'slurry lifting, compacting and finishing' processes before final setting of the mortar so as to ensure that the surface of the waterproof mortar is smooth and flat.
E. Digging a drainage ditch and a water collecting pit in the pit, and draining accumulated water on the substrate; and when the water seepage at the pit bottom is large and certain confined water exists, pouring cushion concrete after taking measures of drainage and pressure reduction.
F. After the concrete of the cushion layer is constructed, attention needs to be paid to timely maintenance so as to prevent the concrete from generating shrinkage cracks.
Step (2), performing waterproof construction on the concrete cushion and the structural side wall;
in the step, concrete waterproof construction of the concrete cushion layer comprises the following steps,
1) leveling the surface of the concrete cushion layer by adopting self-waterproof concrete; after leveling, the surface of the concrete cushion layer should be solid and dry, the flatness of the concrete cushion layer is checked by using a 2m guiding rule, the gap between the straight rule and the surface should not exceed 5mm, and only gentle change is allowed. The leveled surface of the concrete cushion layer can not have loose, ash falling, hollowing, cracks, peeling, dirt and other parts.
2) Paving a waterproof layer on the concrete cushion layer, wherein the waterproof layer comprises a dry-laid felt with the thickness of 3mm, a polyethylene polypropylene coiled material with the thickness of 0.8mm and a polyester non-woven fabric isolating layer; wherein the dry-laid felt with the thickness of 3mm is positioned at the lowest part, namely is directly contacted with the surface of the leveled concrete cushion layer, the polyethylene polypropylene coiled material with the thickness of 0.8mm is positioned in the middle, and the polyester non-woven fabric isolating layer is positioned at the uppermost part;
3) a C20 fine-stone concrete protective layer is applied to the surface of the waterproof layer, the waterproof layer is isolated from construction activities by the concrete protective layer, and the waterproof layer is prevented from being damaged by subsequent construction activities to reduce the waterproof effect.
The structure side wall is generally for building by laying bricks or stones the wall, divides the both sides that are located utility tunnel segment section, plays the effect of structure protection. In the step, the concrete steps of the waterproof construction of the structural side wall are as follows,
1) leveling the inner vertical surface of the structural side wall by adopting self-waterproof concrete;
2) applying a waterproof layer on the inner vertical surface of the leveled structure side wall, wherein the waterproof layer comprises a single-layer polyester tire polymer modified asphalt single-sided self-adhesive coiled material with the thickness of 3mm and an rubberized asphalt non-cured waterproof coating with the thickness of 2 mm; the single-layer 3 mm-thick polyester tire polymer modified asphalt single-side self-adhesive coiled material is laid on the inner vertical surface of the leveled structure side wall, and the 2 mm-thick rubberized asphalt non-cured waterproof coating is arranged on the outer side of the single-layer 3 mm-thick polyester tire polymer modified asphalt single-side self-adhesive coiled material.
3) Plain soil is tamped in the outside of structure side wall, through the plain soil in the tamping structure side wall outside, makes plain soil more closely knit, and then infiltration in the plain soil of outside soil water, precipitation etc. are difficult for following the tamped plain soil, and facilities such as escape canal that the cooperation set up for utility tunnel reduce the inside infiltration of outside water source.
Binding the steel reinforcement frameworks of the bottom plates and part of the side walls of the pipe gallery sections, installing part of side wall templates, and pouring concrete to obtain the bottom plates and part of the side walls of the pipe gallery sections; in the step, the height of the poured partial side wall is 10-15% of the total height of the side wall of the pipe gallery segment.
The bottom plate and the partial side walls on the two sides are poured and formed into a whole, so that the difficulty of connection treatment between the rear side wall and the bottom plate is reduced, the connection strength between the side wall and the bottom plate is effectively improved, and the difficulty of waterproof treatment on a construction joint at the rear is simplified.
Binding a side wall steel reinforcement framework of the pipe gallery segment, installing a side wall template, arranging a support on the inner side of the side wall template, and pouring concrete to obtain the side wall of the pipe gallery segment;
in the step, the pre-buried fastener is installed on the bottom plate obtained in the step (3) before the side wall template is installed, the support of the side wall template is fixedly connected with the pre-buried fastener, the connection condition of the support and the pre-buried fastener is checked before pouring, and the bottom of the side wall template is guaranteed not to leak slurry.
Pre-buried fastener includes rag bolt, coupling nut, outer connecting rod, outer nut and crossbeam etc. specifically: the distance between the ground outlet part of the foundation bolt and the concrete wall surface is as follows: the distance from the concrete surface is 275 mm; the height of the ground is 130 mm; the distance between the embedded rods is 300 mm. The embedded parts are arranged at the starting point and the ending point close to a section of wall body respectively, and the specific size is determined according to the actual situation.
The embedded fastener and the ground form an angle of 45 degrees, when the embedded part is embedded on site, a wire needs to be pulled through, the embedded part is ensured to be carried on the same straight line, and meanwhile, the embedded part angle is embedded according to 45 degrees. The foundation bolt takes protective measures to the screw thread before being embedded, and is wrapped and firmly tied by plastic cloth so as to avoid the influence of concrete adhesion on the screw thread during construction and connect the nut. Because the foundation bolt can not directly spot-weld with the main reinforcement of the structure, in order to ensure that the embedded part does not run or deviate during concrete pouring, an additional reinforcement is required to be added at the corresponding part, the foundation bolt is spot-welded on the additional reinforcement, and during spot welding, the effective diameter of the embedded part is not damaged.
The distance between the single-side brackets is 700-800mm, the wall body and the bottom plate are provided with chamfers, the single-side brackets are difficult to support, so that an I-shaped steel or a full-length 150 × 150 batten is placed at the rear seat of the bracket, the rear seat of the bracket is located on the I-shaped steel or the full-length 150 × 150 batten, the middle part of the bracket is erected by a phi 48 steel pipe commonly used for construction and is specifically manufactured on site, and the front part of the bracket is cushioned by 150 × 150 battens.
Installation process: after steel bars are bound and checked, the side line of the outer wall is bounced → the outer wall template is closed → the single-side bracket is hoisted in place → the single-side bracket is installed → the reinforced steel pipe is installed → the press beam channel steel is installed → the embedded part system is installed → the perpendicularity of the bracket is adjusted → the upper operating platform is installed → the embedded part system is fastened and checked again → the qualified concrete is poured after the check.
The installation requirements include that ① when the side wall formwork is installed, the lower opening of the side wall formwork is aligned with a pre-bounced wall side line, then a steel pipe back edge is installed, the wall formwork is temporarily supported by the steel pipe, ② a support is hoisted to the site from a stacking site, the support is lightly hoisted when being hoisted, when a plurality of supports are stacked together, the supports are stacked on a flat site and are orderly, so that the support is prevented from deforming, ③ the support assembled by a standard joint and a heightened joint is assembled on the material stacking site in advance, then the support is hoisted to the site by a tower crane, ④ a straight wall section is inserted into a pressing beam channel steel of an embedded part system after every five to six supports are installed, ⑥ the template back edge and a single side frame part are connected into a whole by hook head bolts, ⑦ the support after the single side frame is adjusted, the formwork is slightly tilted backwards after the upper opening of the formwork panel is tilted inwards by about 10mm because of the single side frame is stressed, ⑧ a fixing piece is finally fastened and a fixing piece is pre-buried, and when the lower opening of the side wall formwork is ensured not to be pre.
Further, a vertical water stop steel plate is integrally cast in the top center of part of the side wall in the step (3) when part of the side wall is cast, and the water stop steel plate is integrally cast in the side wall in the step (4) when the side wall is cast; and a waterproof coiled material reinforcing layer is arranged on the outer side between the top of part of the side wall and the bottom of the side wall. The stagnant water steel sheet is horizontal in the construction joint between partial side wall and the side wall, cuts the construction joint, has effectively prevented that the water in the outside from getting into the inside of piping lane segment section via the construction joint.
And (5) installing a beam template and a top plate template of the pipe gallery segment (matched with a scaffold facility), binding steel bar frameworks of the beam and the top plate, and pouring concrete to obtain a beam and top plate assembly of the pipe gallery segment.
And (6) carrying out waterproof construction on the top plate of the porch segment.
In this step, the roof waterproof construction is performed as follows,
1) leveling the outer plane of the top plate by adopting self-waterproof concrete;
2) applying a waterproof layer on the inner vertical surface of the leveled structure side wall, wherein the waterproof layer comprises a single-layer polyester tire polymer modified asphalt single-sided self-adhesive coiled material with the thickness of 3mm, an rubberized asphalt non-cured waterproof coating with the thickness of 2mm and a polyester non-woven fabric isolating layer; the waterproof layer comprises a single-layer 3 mm-thick polyester tire polymer modified asphalt single-sided self-adhesive coiled material which is positioned at the innermost side, namely is in direct contact with the outer plane of the leveled top plate, a 2 mm-thick rubberized asphalt non-cured waterproof coating is positioned in the middle, and a polyester non-woven fabric isolating layer is positioned at the outermost side;
3) a C20 fine-stone concrete protective layer is applied to the surface of the waterproof layer, the waterproof layer is isolated from construction activities by the concrete protective layer, and the waterproof layer is prevented from being damaged by subsequent construction activities to reduce the waterproof effect.
In this embodiment, still including bottom plate reentrant corner waterproofing work and roof external corner construction, promote the waterproof ability of piping lane festival section in bottom plate reentrant corner position and roof external corner position, the external corner of bottom plate reentrant corner concrete indication bottom plate both sides edge, the external corner of roof external corner concrete indication roof both sides edge, this above-mentioned position because the crack appears easily in the structural feature of concrete, consequently carries out water repellent as key position.
The construction of the internal corner of the bottom plate comprises the step of arranging a waterproof coiled material reinforcing layer at the position corresponding to the internal corner of the bottom plate in the step (2), wherein the edges of two sides of the waterproof coiled material reinforcing layer are respectively bonded and sealed with a waterproof layer on a concrete cushion layer and a waterproof layer on a structural outer wall by polysulfide sealant.
And (3) the construction of the external corner of the top plate comprises the step of arranging a waterproof coiled material reinforcing layer at the position corresponding to the external corner of the top plate in the step (6), wherein the edges of two sides of the waterproof coiled material reinforcing layer are respectively bonded and sealed with a waterproof layer on the top plate and a waterproof layer on a structural outer wall by polysulfide sealant.
The waterproof treatment method of deformation joints on other positions such as the bottom plate, the top plate and the side wall comprises the following steps:
the deformation joint is a structural gap which is allowed to deform and is set by considering the uneven stress of the structure and the expansion and contraction of the concrete structure, is a difficult point of waterproof treatment and is a key link in the self-waterproofing of the structure. The construction joint is a weak link of self-waterproofing of the structure in the construction process, and the waterproof quality of the structure can be directly influenced by the quality of treatment, so that the waterproof treatment of the construction joint needs to be carefully done.
1. Method for making deformation joint
The top board deformation joint waterproof material adopts a buried steel edge rubber water stop belt CB350 × 8-30, polysulfide sealant 30 × 30, a water-swelling water stop strip 30 × 30 and a low-foaming high-density closed-cell polyethylene plastic foam joint filling board.
The bottom plate and side wall deformation joint waterproof material adopts a middle-buried steel edge rubber water stop belt CB350 × 8-30, polysulfide sealant 30 × 30 and a low-foaming high-density closed-cell polyethylene plastic foam joint filling plate.
And (3) reserving grooves of 30 × 30mm on the inner side and the outer side of the deformation joint of the side wall, the top plate and the bottom plate, caulking the deformation joint by polysulfide sealant after concrete pouring and curing on the two sides of the deformation joint are finished, and preventing any part from generating a breaking point so as to avoid water channeling phenomenon.
2. Deformation joint waterstop construction
Pre-buried formula waterstop: at a deformation joint of a concrete structure, two wings of the middle-buried water stop belt are respectively buried into the structure along the central line of the thickness of the structure, and the center of the circular ring is aligned with the center of the deformation joint. The buried water stop is suspended on the steel bar by a thin iron wire to form a basin shape when the top and bottom plates are horizontally installed, so that gas under the water stop cannot escape to form a pore when concrete is tamped.
The water stop belt can not be turned and twisted when being arranged, and can be immediately replaced if being damaged. Before concrete is poured, the waterstop is prevented from being stained by dirt and cement mortar, impurities on the surface of the waterstop are required to be cleaned, and therefore the water seepage channel is prevented from being formed due to the fact that the concrete is not tightly meshed with the waterstop. The concrete contacting with the water stop belt should not generate the phenomena of coarse aggregate concentration and leakage vibration. The water stop should be accurately in place and firmly installed, the end plate of the template should be made into a box shape, and the other side wing of the water stop is protected from being damaged when concrete on one side is poured. The joint of the water stop belt adopts a butt joint method, and the joint is selected at a part with smaller structural stress.
Claims (9)
1. A cast-in-place concrete construction method for a pipe gallery segment is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
(1) performing concrete cushion construction on the foundation of the foundation pit obtained by excavation;
(2) waterproof construction is carried out on the concrete cushion and the structural side wall;
(3) binding the steel reinforcement frameworks of the bottom plates and part of the side walls of the pipe gallery sections, installing part of side wall templates, and pouring concrete to obtain the bottom plates and part of the side walls of the pipe gallery sections;
(4) binding a side wall steel reinforcement framework of the pipe gallery segment, installing a side wall template, arranging a support at the inner side of the side wall template, and pouring concrete to obtain the side wall of the pipe gallery segment;
(5) installing a beam template and a top plate template of the pipe gallery segment, binding steel bar frameworks of the beam and the top plate, and pouring concrete to obtain a beam and top plate combination of the pipe gallery segment;
(6) and carrying out waterproof construction on the top plate of the pipe gallery segment.
2. A method of cast in place concrete construction of a pipe gallery section as claimed in claim 1, characterized by: the concrete structure cushion layer construction in the step (1) comprises the following steps,
1) the method comprises the following steps of (1) checking a groove of a foundation pit, cleaning up floating soil on the surface of the foundation pit, enabling elevation and surface flatness to meet design requirements and standard regulations, carrying out sectional groove checking according to a program, carrying out foundation treatment on a found soil layer which does not meet the design requirements according to the opinions of a design unit, and after the treatment is finished, asking a supervision unit to accept the foundation treatment and handling hidden inspection records;
2) retesting and measuring lofting, retesting the size and the position deviation of the foundation pit excavation after the foundation pit excavation is finished, wherein the size and the position deviation of the foundation pit excavation should meet the construction and specification requirements;
3) the method comprises the following steps of (1) formwork erecting and elevation retest, wherein a wood beam is used as a side formwork of the engineering cushion formwork and is kept stable, and a level gauge is used for retesting the elevation so as to prevent elevation errors after the cushion is poured;
4) and (3) constructing cushion concrete, wherein the cushion layer adopts C15 plain concrete with the thickness of 100mm, and the cushion layer concrete is required to be maintained in time after the construction is finished so as not to cause shrinkage cracks in the concrete.
3. A method of cast in place concrete construction of a pipe gallery section as claimed in claim 2, characterized by: the waterproof construction of the concrete cushion in the step (2) comprises the following steps,
1) leveling the surface of the concrete cushion layer by adopting self-waterproof concrete;
2) paving a waterproof layer on the concrete cushion layer, wherein the waterproof layer comprises a dry-laid felt with the thickness of 3mm, a polyethylene polypropylene coiled material with the thickness of 0.8mm and a polyester non-woven fabric isolating layer;
3) and (3) applying a C20 fine-stone concrete protective layer on the surface of the waterproof layer.
4. A method of cast in place concrete construction of a pipe gallery section as claimed in claim 3, characterized by: the step of the waterproof construction of the structure side wall in the step (2) is that,
1) leveling the inner vertical surface of the structural side wall by adopting self-waterproof concrete;
2) applying a waterproof layer on the inner vertical surface of the leveled structure side wall, wherein the waterproof layer comprises a single-layer polyester tire polymer modified asphalt single-sided self-adhesive coiled material with the thickness of 3mm and an rubberized asphalt non-cured waterproof coating with the thickness of 2 mm;
3) and tamping plain soil outside the side wall of the structure.
5. A method of cast in place concrete construction of a pipe gallery section as claimed in claim 4, characterized by: and (4) the height of the partial side wall poured in the step (3) is 10-15% of the total height of the side wall of the pipe gallery segment.
6. A method of cast in place concrete construction of a pipe gallery section as claimed in claim 5, characterized by: and (4) installing an embedded fastener on the bottom plate obtained in the step (3) before the side wall template is installed, fixedly connecting the support of the side wall template with the embedded fastener, and checking the connection condition of the support and the embedded fastener before pouring to ensure that slurry does not leak from the bottom of the side wall template.
7. A method of cast in place concrete construction of a pipe gallery section as claimed in claim 6, characterized by: integrally pouring a vertical water stop steel plate at the center of the top of part of the side wall when the part of the side wall is poured in the step (3), and integrally pouring the water stop steel plate in the side wall when the side wall is poured in the step (4); and a waterproof coiled material reinforcing layer is arranged on the outer side between the top of part of the side wall and the bottom of the side wall.
8. A method of cast in place concrete construction of a pipe gallery section as claimed in claim 7, characterized by: the waterproof construction of the top plate in the step (6) comprises the following steps,
1) leveling the outer plane of the top plate by adopting self-waterproof concrete;
2) applying a waterproof layer on the inner vertical surface of the leveled structure side wall, wherein the waterproof layer comprises a single-layer polyester tire polymer modified asphalt single-sided self-adhesive coiled material with the thickness of 3mm, an rubberized asphalt non-cured waterproof coating with the thickness of 2mm and a polyester non-woven fabric isolating layer;
3) and (3) applying a C20 fine-stone concrete protective layer on the surface of the waterproof layer.
9. A method of cast in place concrete construction of a pipe gallery section as claimed in claim 8, characterized by: the method also comprises the steps of waterproof construction of the internal corner of the bottom plate and the external corner construction of the top plate; the construction of the internal corner of the bottom plate comprises the step of arranging a waterproof coiled material reinforcing layer at the position corresponding to the internal corner of the bottom plate in the step (2), wherein the edges of two sides of the waterproof coiled material reinforcing layer are respectively bonded and sealed with a waterproof layer on a concrete cushion layer and a waterproof layer on a structural outer wall by polysulfide sealant; and (3) the construction of the external corner of the top plate comprises the step of arranging a waterproof coiled material reinforcing layer at the position corresponding to the external corner of the top plate in the step (6), wherein the edges of two sides of the waterproof coiled material reinforcing layer are respectively bonded and sealed with a waterproof layer on the top plate and a waterproof layer on a structural outer wall by polysulfide sealant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010276765.3A CN111456085A (en) | 2020-04-10 | 2020-04-10 | Cast-in-place concrete construction method for pipe gallery segment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010276765.3A CN111456085A (en) | 2020-04-10 | 2020-04-10 | Cast-in-place concrete construction method for pipe gallery segment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112411564A (en) * | 2020-11-06 | 2021-02-26 | 天津市市政工程设计研究院 | Waterproof structure with latticed columns penetrating through bottom plate and construction method of waterproof structure |
| CN112647537A (en) * | 2020-12-19 | 2021-04-13 | 中交二公局萌兴工程有限公司 | Pipe gallery construction process |
-
2020
- 2020-04-10 CN CN202010276765.3A patent/CN111456085A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112411564A (en) * | 2020-11-06 | 2021-02-26 | 天津市市政工程设计研究院 | Waterproof structure with latticed columns penetrating through bottom plate and construction method of waterproof structure |
| CN112647537A (en) * | 2020-12-19 | 2021-04-13 | 中交二公局萌兴工程有限公司 | Pipe gallery construction process |
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Application publication date: 20200728 |