CN111677007A - Comprehensive pipe gallery adopting sprayed ultrahigh-toughness cement-based composite material and construction method thereof - Google Patents
Comprehensive pipe gallery adopting sprayed ultrahigh-toughness cement-based composite material and construction method thereof Download PDFInfo
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- CN111677007A CN111677007A CN202010461076.XA CN202010461076A CN111677007A CN 111677007 A CN111677007 A CN 111677007A CN 202010461076 A CN202010461076 A CN 202010461076A CN 111677007 A CN111677007 A CN 111677007A
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- steel plate
- corrugated steel
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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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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
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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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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2200/00—Geometrical or physical properties
- E02D2200/12—Geometrical or physical properties corrugated
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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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- 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
- E02D2300/0034—Steel; Iron in wire form
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0051—Including fibers
- E02D2300/0053—Including fibers made from glass
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0051—Including fibers
- E02D2300/0068—Including fibers made from carbon
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0075—Textiles
- E02D2300/0078—Textiles woven
Abstract
The invention discloses a comprehensive pipe gallery adopting a sprayed ultrahigh-toughness cement-based composite material and a construction method thereof. The utility tunnel structure is composed of a corrugated steel plate, a fiber mesh reinforced ultra-high toughness cement-based composite material and a concrete base. The corrugated steel plate is cold-bent to form an arch-shaped cross section, the surface of the corrugated steel plate is provided with a fiber woven net, and the effective connection between the corrugated steel plate and the fiber woven net is ensured by a connecting piece; and spraying the ultra-high-toughness cement-based composite material on the corrugated steel plate by using a spraying device. The fiber woven mesh is formed by weaving carbon fibers, glass fibers or thin steel wires in a criss-cross mode. The comprehensive pipe gallery structure provided by the invention can ensure the synergistic stress between the ultrahigh-toughness material and the steel plate, and obtain excellent bearing performance; when the ultrahigh-toughness material is pulled, a plurality of fine cracks can be generated, the complex environments of internal steel plates and soil can be effectively isolated, and the steel rust prevention effect is achieved; the construction process is simple and efficient, the construction period can be shortened, and the cost is reduced.
Description
Technical Field
The invention relates to the technical field of structural engineering, in particular to a comprehensive pipe gallery adopting a sprayed ultrahigh-toughness cement-based composite material and a construction method thereof.
Background
The urban underground comprehensive pipe gallery (called a comprehensive pipe gallery for short) is a public tunnel which is used for intensively laying municipal pipelines such as electric power, communication, radio and television, water supply, drainage, heating power, fuel gas and the like in the urban underground, and is a modern, scientific and intensive urban infrastructure. The utility tunnel solves the problems of dense overhead wire nets, repeated road surface excavation, frequent pipeline accidents and the like, is favorable for guaranteeing the functions of urban infrastructure, beautifying urban environment and improving the development quality and comprehensive bearing capacity of cities. With the deepening of the urbanization process of China and the improvement of the urban construction standard, the promotion and the support of the national layer to the comprehensive pipe gallery are continuously increased based on the advantages of the comprehensive pipe gallery, and in recent years, a plurality of domestic cities begin to lay the comprehensive pipe gallery network in succession.
The reinforced concrete comprehensive pipe gallery is common in actual engineering, and a main body structure of the arched reinforced concrete pipe gallery is formed by adopting a prefabricated or cast-in-place mode. In recent years, concrete has been replaced by a comprehensive pipe gallery mainly composed of steel plates because of its own weight and its tendency to crack in the tension side under bending load. Utilize the steel sheet as the main structure body of piping lane, can show and reduce the structure dead weight, the construction is convenient, reduction construction period and reduction human cost. However, the underground environment of the comprehensive pipe gallery is complex, so that the steel is easily corroded; in order to prevent the occurrence of corrosion of steel, the structural cost is increased by electroplating the steel or laying a waterproof material. On the other hand, the steel plate with smaller thickness is easy to be buckled and damaged, and the risk of structural failure is increased.
Disclosure of Invention
In order to solve the problems that a steel plate comprehensive pipe gallery is easy to rust and easy to bend under pressure, the invention provides a comprehensive pipe gallery adopting sprayed ultrahigh-toughness cement-based composite materials and a construction method thereof.
A comprehensive pipe gallery adopting a sprayed ultrahigh-toughness cement-based composite material comprises a concrete base; further comprising:
the corrugated steel plate is formed into an arch shape through cold bending forming, and the end part of the corrugated steel plate is supported on the concrete base;
the fiber woven mesh is fixed on the corrugated steel plate;
and the ultrahigh-toughness cement-based composite material is sprayed on the corrugated steel plate on which the fiber woven net 4 is arranged to form a reinforcing layer.
In the utility tunnel structure, the wave-shaped steel plate forms an arch-shaped cross section through cold roll forming, the end part is supported on the concrete base, and the fiber mesh reinforced ultra-high toughness cement-based composite material 2 is arranged outside the wave-shaped steel plate 1.
Among the utility tunnel structure, the wave form steel sheet includes sinusoidal wave steel sheet and two kinds of forms of trapezoidal wave steel sheet, in the use, can adopt one of them structure, or simultaneously, adopts two kinds of structures.
A construction method of a comprehensive pipe gallery comprises the following steps:
1) forming the corrugated steel plate into an arch through cold bending, and supporting the end part of the corrugated steel plate on a concrete base;
2) arranging the fiber woven mesh on the outer surface of the corrugated steel plate, and fixing the fiber woven mesh on the outer surface of the corrugated steel plate through a connecting piece in a spot welding manner to realize the connection between the fiber woven mesh and the corrugated steel plate; spraying the ultrahigh-toughness cement-based composite material on the corrugated steel plate with the fiber woven net by using a spraying device to obtain a comprehensive pipe gallery adopting the sprayed ultrahigh-toughness cement-based composite material;
the fiber woven mesh is formed by weaving carbon fibers, glass fibers or thin steel wires in a criss-cross mode.
The ultra-high toughness cement-based composite material can be sprayed, and specifically comprises the following components: ordinary portland cement, aluminate cement, water, fine aggregate, fly ash, silica fume, metakaolin, redispersible latex powder, modified bentonite, hydroxypropyl methyl cellulose, polycarboxylic acid water reducing agent and polyvinyl alcohol fiber. The ultra-high toughness cement-based composite material is prepared from the following raw materials in percentage by mass:
the utility model provides a comprehensive pipe rack structure and a construction method thereof, which is characterized in that a layer of fiber net reinforced ultra-high tenacity cement-based composite material is arranged outside a corrugated steel plate pipe rack, and the invention has the following advantages:
(1) the adopted cement-based composite material with ultrahigh toughness has high bearing capacity under compression, shows strain hardening characteristics when being pulled, and can stably reach more than 3 percent of ultimate tensile strain, so that the synergistic stress between the composite material and the corrugated steel plate can be ensured.
(2) By arranging the fiber woven mesh on the surface of the corrugated steel plate, the stress performance of the ultra-high toughness cement-based composite material can be obviously improved, and the bonding effect between concrete and the steel plate is also improved. The corrugated steel plate and the fiber net reinforced ultra-high toughness cement-based composite material on the outer side form a steel-concrete combined section, and the structural bearing performance of 1+1>2 is generated by utilizing the cooperative working mechanism and the combined effect between the corrugated steel plate and the fiber net reinforced ultra-high toughness cement-based composite material. The steel plate is not easy to bend under the restraint of concrete, and the steel plate provides support and a permanent template for the fiber woven mesh and the concrete.
(3) When the ultrahigh-toughness cement-based composite material is pulled, a plurality of fine cracks can be generated, the complex environments of internal steel plates and soil can be effectively isolated, and the steel rust prevention effect is achieved.
(4) The existing mature ultra-high toughness cement-based composite material spraying technology and equipment are utilized, so that a simple and efficient construction process can be realized, the construction period of the structure is shortened, and the construction cost is reduced.
(5) The comprehensive pipe gallery structure provided by the invention can ensure the synergistic stress between the ultrahigh-toughness material and the steel plate, and obtain excellent bearing performance; when the ultrahigh-toughness material is pulled, a plurality of fine cracks can be generated, the complex environments of internal steel plates and soil can be effectively isolated, and the steel rust prevention effect is achieved; the construction process is simple and efficient, the construction period can be shortened, and the cost is reduced.
Drawings
FIG. 1 is a schematic structural view of a utility tunnel;
figure 2-1 is a cross-sectional view a-a of the utility tunnel structure: the waveform of the steel plate adopts sine wave;
fig. 2-2 is a sectional view a-a of the utility tunnel structure: the wave shape of the steel plate adopts trapezoidal wave folding;
FIG. 3-1 is a schematic view of a construction method of the utility tunnel: before spraying the ultra-high toughness cement-based composite material;
fig. 3-2 is a schematic view of a construction method of the comprehensive pipe rack: spraying the cement-based composite material with ultrahigh toughness.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, a utility tunnel using sprayed ultra-high toughness cement-based composite material comprises the following components: the corrugated steel plate 1 comprises two forms: 1-1 parts of sine wave steel plates and 1-2 parts of trapezoidal wave steel plates; the fiber mesh reinforced cement-based composite material 2 with ultrahigh toughness; a concrete base 3.
As shown in fig. 1, the comprehensive pipe rack structure comprises a corrugated steel plate 1, a fiber mesh reinforced ultra-high toughness cement-based composite material 2 and a concrete base 3; the corrugated steel plate 1 is formed into an arch-shaped section through cold bending forming, the end part is supported on a concrete base 3, and the fiber mesh reinforced ultra-high toughness cement-based composite material 2 is arranged outside the corrugated steel plate 1.
As shown in fig. 2-1 and 2-2, the corrugated steel plate 1 includes two forms of sine-shaped corrugated steel plate 1-1 and trapezoidal-shaped corrugated steel plate 1-2.
As shown in fig. 3-1 and 3-2, in the construction process of the comprehensive pipe gallery structure, the fiber woven mesh 4 is firstly arranged on the outer surface of the corrugated steel plate 1, then the fiber woven mesh 4 is spot-welded on the outer surface of the corrugated steel plate 1 through the connecting piece 5, the connection between the fiber woven mesh 4 and the corrugated steel plate 1 is realized, and finally, the ultra-high toughness cement-based composite material is sprayed on the corrugated steel plate 1 on which the fiber woven mesh 4 is arranged by using the spraying device 6.
The admixture composition of the sprayable ultra-high toughness cement-based composite material comprises the following components: : ordinary portland cement, aluminate cement, water, fine aggregate, fly ash, silica fume, metakaolin, redispersible latex powder, modified bentonite, hydroxypropyl methyl cellulose, polycarboxylic acid water reducing agent and polyvinyl alcohol fiber.
The mixture comprises the following components in percentage by mass:
wherein the maximum grain diameter of the fine aggregate is not more than 0.5mm, the length of the polyvinyl alcohol fiber is 8-12 mm, and the mixing amount of the polyvinyl alcohol fiber is 1.0-2.5 percent of the total volume of the ultra-high toughness cement-based composite material; for polyvinyl alcohol fiber with the length of 8mm, the diameter is 0.039mm, the tensile strength is 1620MPa, the elastic modulus is 42.8GPa, and the ultimate elongation is 6 percent; for a polyvinyl alcohol fiber with a length of 12mm, the diameter is 0.026mm, the tensile strength is 1560MPa, the elastic modulus is 36.3GPa, and the ultimate elongation is 7%.
The sprayable ultrahigh-toughness cement-based composite material obtained by the matching has good rheological property, slump of 120-200 mm and small viscous resistance in a pipeline of a sprayer, and cannot cause nozzle blockage; the spraying process can be in a foggy shape, and the consistency is rapidly increased after the spraying is carried out on the surface to be sprayed, so that the spraying process is basically free of rebound; the material can be quickly hardened after being sprayed on the surface to be sprayed, and a quick-setting agent does not need to be sprayed additionally.
The fiber woven net 4 is formed by weaving carbon fibers, glass fibers or thin steel wires in a criss-cross mode. Wherein, the tensile strength of the carbon fiber is 3500MPa, the elastic modulus is 190GPa, and the elongation at break is 1.8%; the tensile strength of the glass fiber is 3200MPa, the elastic modulus is 65GPa, and the elongation at break is 4.5%; the tensile strength of the steel wire is about 400MPa, the elastic modulus is 200GPa, and the breaking elongation is 8.0%. Specifically, a woven fiber mesh 4 formed by weaving glass fibers in a criss-cross manner can be used.
Tests show that the fiber mesh reinforced ultra-high-toughness cement-based composite material can be fully connected with a steel plate, and the structural damage caused by interface slippage between the fiber mesh reinforced ultra-high-toughness cement-based composite material and the steel plate is effectively prevented; the tensile limit strain of the fiber mesh reinforced ultra-high toughness cement-based composite material is more than 3 percent (more than 300 times of that of common concrete and more than 15 times of yield strain of reinforcing steel bars), the maximum crack width in a steady-state cracking stage is 0.05 mm-0.2 mm, and cracking and seepage prevention can be effectively controlled.
The comprehensive pipe gallery adopting the sprayed ultrahigh-toughness cement-based composite material provided by the invention has the advantages that the ultrahigh-toughness cement-based composite material not only has the functions of cracking resistance and seepage prevention, but also has the function of improving the bearing performance of the whole structure as a structural component. Research shows that for a corrugated steel plate comprehensive pipe gallery with the thickness of 2mm commonly used in engineering, the bending rigidity of a unit-width plate around a strong axis is 30.8 kN.m, and the bending rigidity around a weak axis is 0.14 kN.m; by spraying the ultra-high toughness cement-based composite material with the thickness of 10mm on the surface of the plate, the bending rigidity of the plate per unit width around a strong axis can be improved to about 107 kN.m (improved by more than 3 times), and the bending rigidity around a weak axis can be improved to about 5.9 kN.m (improved by more than 40 times). Therefore, the comprehensive pipe gallery system provided by the invention can improve the corrosion resistance of the structure and obviously improve the rigidity, strength and stability of the structure for bearing out-of-plane loads.
Claims (4)
1. A comprehensive pipe gallery adopting a sprayed ultrahigh-toughness cement-based composite material comprises a concrete base; it is characterized by also comprising:
the corrugated steel plate is formed into an arch shape through cold bending forming, and the end part of the corrugated steel plate is supported on the concrete base;
the fiber woven mesh is fixed on the corrugated steel plate;
and the ultrahigh-toughness cement-based composite material is sprayed on the corrugated steel plate on which the fiber woven net is arranged to form a reinforcing layer.
2. The utility tunnel according to claim 1, wherein the corrugated steel plate is one or both of a sine-shaped corrugated steel plate and a trapezoid-shaped corrugated steel plate.
3. A construction method of a comprehensive pipe gallery adopting a sprayed ultrahigh-toughness cement-based composite material is characterized by comprising the following steps:
1) forming the corrugated steel plate into an arch through cold bending, and supporting the end part of the corrugated steel plate on a concrete base;
2) arranging the fiber woven mesh on the outer surface of the corrugated steel plate, and fixing the fiber woven mesh on the outer surface of the corrugated steel plate through a connecting piece in a spot welding manner to realize the connection between the fiber woven mesh and the corrugated steel plate; and (3) spraying the ultrahigh-toughness cement-based composite material on the corrugated steel plate with the fiber woven net by using a spraying device to obtain the comprehensive pipe gallery adopting the sprayed ultrahigh-toughness cement-based composite material.
4. The construction method of the utility tunnel sprayed with the ultra-high toughness cement-based composite material as claimed in claim 3, wherein the fiber mesh grid is woven by carbon fibers, glass fibers or thin steel wires in a criss-cross manner.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010461076.XA CN111677007A (en) | 2020-05-27 | 2020-05-27 | Comprehensive pipe gallery adopting sprayed ultrahigh-toughness cement-based composite material and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010461076.XA CN111677007A (en) | 2020-05-27 | 2020-05-27 | Comprehensive pipe gallery adopting sprayed ultrahigh-toughness cement-based composite material and construction method thereof |
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| CN111677007A true CN111677007A (en) | 2020-09-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113089684A (en) * | 2021-04-04 | 2021-07-09 | 泰安市岱宗机电科技开发有限公司 | Side slope support bedding surface device for foundation pit, construction method and application thereof |
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| JP2012140826A (en) * | 2011-01-05 | 2012-07-26 | Takenaka Komuten Co Ltd | Bracing wall and building |
| CN103496865A (en) * | 2013-09-16 | 2014-01-08 | 北京工业大学 | Hybrid FRP (Fiber Reinforced Plastic) grid enhancedreinforced ECC (Engineered Cementitious Composite) and application thereof tostructure for reinforcing concrete structure |
| CN106245511A (en) * | 2016-08-31 | 2016-12-21 | 湖南省交通规划勘察设计院 | A kind of two-fold shape combined beam structure and construction method thereof |
| CN108342995A (en) * | 2018-01-18 | 2018-07-31 | 湖北工程学院 | The fiber cloth reinforced pillarwork of steel wire of overcoating ultra-high performance concrete |
| CN108468347A (en) * | 2018-04-23 | 2018-08-31 | 哈尔滨工业大学 | Corrugated steel outer lining concrete structure for underground pipe gallery |
| CN208167799U (en) * | 2018-05-03 | 2018-11-30 | 大连宜而居科技有限公司 | A kind of ripple steel composites structure and the double storehouse pipe galleries of reinforced concrete combination assembled |
-
2020
- 2020-05-27 CN CN202010461076.XA patent/CN111677007A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012140826A (en) * | 2011-01-05 | 2012-07-26 | Takenaka Komuten Co Ltd | Bracing wall and building |
| CN103496865A (en) * | 2013-09-16 | 2014-01-08 | 北京工业大学 | Hybrid FRP (Fiber Reinforced Plastic) grid enhancedreinforced ECC (Engineered Cementitious Composite) and application thereof tostructure for reinforcing concrete structure |
| CN106245511A (en) * | 2016-08-31 | 2016-12-21 | 湖南省交通规划勘察设计院 | A kind of two-fold shape combined beam structure and construction method thereof |
| CN108342995A (en) * | 2018-01-18 | 2018-07-31 | 湖北工程学院 | The fiber cloth reinforced pillarwork of steel wire of overcoating ultra-high performance concrete |
| CN108468347A (en) * | 2018-04-23 | 2018-08-31 | 哈尔滨工业大学 | Corrugated steel outer lining concrete structure for underground pipe gallery |
| CN208167799U (en) * | 2018-05-03 | 2018-11-30 | 大连宜而居科技有限公司 | A kind of ripple steel composites structure and the double storehouse pipe galleries of reinforced concrete combination assembled |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113089684A (en) * | 2021-04-04 | 2021-07-09 | 泰安市岱宗机电科技开发有限公司 | Side slope support bedding surface device for foundation pit, construction method and application thereof |
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Application publication date: 20200918 |
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