CN111441385A - Construction method for strengthening treatment of periphery of road inspection well - Google Patents
Construction method for strengthening treatment of periphery of road inspection well Download PDFInfo
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- CN111441385A CN111441385A CN202010261243.6A CN202010261243A CN111441385A CN 111441385 A CN111441385 A CN 111441385A CN 202010261243 A CN202010261243 A CN 202010261243A CN 111441385 A CN111441385 A CN 111441385A
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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
- E02D29/12—Manhole shafts; Other inspection or access chambers; Accessories therefor
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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
- E02D2300/0051—Including fibers
- E02D2300/0064—Including fibers made from metal
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- General Engineering & Computer Science (AREA)
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Abstract
The invention relates to a construction method for reinforcing the periphery of a road inspection well, which has the technical scheme that: the method comprises the following steps: s1, determining a foundation pit on the upper surface of the water-stable base layer by taking the centroid of the inspection well as breaking the water-stable base layer in the foundation pit; s2: shaft construction: filling and leveling the periphery of the base well by concrete; s3: processing and installing steel bars: installing a reinforcement cage in the reinforcing cavity; s4: manufacturing and installing an inner membrane: an inner film is made of an iron sheet and is sleeved at the wellhead; s5: pouring concrete: pouring steel fiber concrete in the reinforcing cavity; s6: elevation control: controlling the installation elevation of the well lid according to four points positioned by measurement by a cross method; s7: asphalt concrete construction: and (3) brushing asphalt permeable layer viscous oil after the steel fiber concrete is finally set, and paving the asphalt concrete on the upper surface of the asphalt permeable layer viscous oil. The invention has the advantages that the periphery of the inspection well is reinforced, and the possibility of cracking and sinking of the periphery of the inspection well is reduced.
Description
Technical Field
The invention relates to the technical field of road construction, in particular to a construction method for strengthening the periphery of a road inspection well.
Background
The inspection well is used for maintaining power supply, water drainage, pollution discharge, communication, cable television, gas pipes, street lamp lines and the like of urban underground infrastructure, and is convenient to install. It is usually installed at the intersection of pipelines, turning, where the pipe diameter or slope changes, and at certain intervals on straight pipeline sections, and is convenient for regular inspection of the attached structures.
The existing inspection well generally comprises a well seat, a shaft, a well cover, related accessories and the like, and is built in a school district or on a traffic road; the inspection well is of a brick-built structure, and the nodular cast iron well lid is placed on a brick-built shaft and connected with an asphalt pavement.
Because the inspection well belongs to a rigid structure, the asphalt pavement is of a flexible structure relative to the inspection well, so that the joint of the asphalt pavement and the brick inspection well of the road is weak, the stress concentration phenomenon is caused, the damage stress easily exceeds the allowable stress, and the phenomena of cracking, sinking and the like easily occur at the periphery of the inspection well. In addition, precipitation easily infiltrates into the roadbed through a gap between the asphalt and the inspection well to soften the roadbed, so that the peripheral bearing capacity of the inspection well is further reduced, the damage is aggravated, and the problem is aggravated when the frost heaving phenomenon exists in a cold area; under the repeated action of the driving load, the manhole cover and the manhole cover have the problems of different deformation and different stress, so that the settlement is different, the deformation of asphalt concrete is larger, the deformation of the manhole is smaller, and the manhole cover is damaged at first and the phenomena of cracking and sinking of a manhole body occur; the elevation difference generated around the well is damaged by the impact of the automobile, and further the damage of the road surface is caused.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a reinforcement treatment construction method for the periphery of a road inspection well, which has the advantages of reinforcing the periphery of the inspection well and reducing the possibility of cracking and sinking of the periphery of the inspection well.
The technical purpose of the invention is realized by the following technical scheme:
the construction method for reinforcing the periphery of the road inspection well comprises the following steps:
s1: excavation of a foundation pit: after the construction of the cement stabilized base layer of the inspection well is completed, determining a foundation pit on the upper surface of the cement stabilized base layer by taking the centroid of the inspection well as breaking the cement stabilized base layer in the foundation pit to form a reinforcing cavity;
s2: shaft construction: filling and leveling the periphery of the base well by concrete;
s3: processing and installing steel bars: installing a reinforcement cage in the reinforcement cavity, wherein the reinforcement cage comprises two layers of annular stress reinforcement meshes and fixing ribs arranged between the two layers of annular stress reinforcement meshes and used for fixing annular stress reinforcements, and the two layers of annular stress reinforcement meshes are arranged along the circumferential direction of the well;
s4: manufacturing and installing an inner membrane: a round inner film made of iron sheet is sleeved at the wellhead;
s5: pouring concrete: pouring steel fiber concrete in the reinforcing cavity to form a steel fiber concrete reinforcing layer, wherein the steel fiber concrete reinforcing layer is poured to the level 5cm of the two layers of asphalt pavements in the cement stabilized base layer and is flush with the upper surface of one layer of asphalt pavements in the cement stabilized base layer;
s6: elevation control: controlling the installation elevation of the well lid according to four points positioned by measurement by a cross method;
s7: asphalt concrete construction: after the steel fiber concrete is finally set, the surface floating slurry is napped, asphalt permeable layer viscous oil is coated, and then the asphalt concrete is spread on the upper surface of the asphalt permeable layer viscous oil.
By adopting the technical scheme, the periphery of the inspection well is reinforced, and the possibility of cracking and sinking of the periphery of the inspection well is reduced.
The present invention in a preferred example may be further configured to: and in the S1, the foundation pit is circular.
The present invention in a preferred example may be further configured to: the diameter of the foundation pit is 2 m.
The present invention in a preferred example may be further configured to: the water-stable base layer in the foundation pit in the S1 is specifically as follows:
1) cutting the upper surface of the second-layer asphalt by using a cutting saw;
2) breaking the water-stabilized base layer by using an air pick until the height of the second-layer asphalt is 50cm below the elevation;
3) the size of the broken cement stabilized base layer is smaller than that of the foundation pit.
The present invention in a preferred example may be further configured to: and in S5, when the steel fiber concrete reinforcing layer is poured, vibrating by using an inserted vibrating rod.
Through adopting above-mentioned technical scheme, the staff when pouring the steel fibre concrete, practical bayonet vibrating spear vibrates the steel fibre concrete for the even dispersion of steel fibre concrete is consolidating the intracavity.
The present invention in a preferred example may be further configured to: and (S5) covering plastic cloth after the steel fiber concrete reinforcing layer is poured, and watering and curing.
By adopting the technical scheme, the service life of the steel fiber concrete is prolonged, and the anti-cracking effect of the steel fiber concrete is enhanced.
The present invention in a preferred example may be further configured to: and in the S5, the steel fiber concrete is prepared by mixing cement, aggregate, fly ash, an additive and steel fibers.
By adopting the technical scheme, the steel fiber is added into the concrete, so that the stress concentration at the end part of the fine crack caused by the load on the base concrete is reduced, the expansion of the concrete crack is controlled, and the crack resistance of the whole composite material is improved. Meanwhile, because the interface between the concrete and the steel fiber has great interface cohesive force, the external force can be transmitted to the fiber with large tensile strength and high elongation, so that the steel fiber concrete is taken as a uniform whole, and the original tensile strength, bending strength and elongation at break of the concrete are obviously improved by resisting the action of the external force.
The present invention in a preferred example may be further configured to: the admixture is configured as a pumping agent.
By adopting the technical scheme, the pumping aid is used as an additive for improving the pumping performance of concrete, has excellent water reducing and reinforcing effects and delayed coagulation and plasticity retention performances, thereby enhancing the early-strength delayed coagulation effect of the steel fiber concrete, and has the effects of tensile strength, bending resistance, crack resistance, impact resistance, fatigue resistance and toughness reinforcement compared with common concrete, thereby prolonging the service life of the steel fiber concrete, accelerating the coagulation speed of the concrete and shortening the construction period.
The present invention in a preferred example may be further configured to: and S6, the height of the well cover is 4.2cm higher than the upper surface of the second layer of asphalt in the water stable base layer.
The present invention in a preferred example may be further configured to: and S7, after the construction of the asphalt concrete is finished, installing the well cover, wherein the top height of the well cover is 2mm higher than the design elevation and is the same as the road slope.
In conclusion, the invention has the following beneficial effects:
1. the method comprises the following steps of excavating a foundation pit around the inspection well, placing a reinforcement cage in the foundation pit, and pouring steel fiber concrete, so that the periphery of the inspection well is reinforced, and the possibility of cracking and sinking of the periphery of the inspection well is reduced;
2. by adding the steel fibers into the steel fiber concrete, the tensile strength, the bending strength and the fracture elongation of the steel fiber concrete are enhanced, so that the possibility of cracking and sinking at the periphery of the inspection well is reduced;
3. by adding the pumping aid into the steel fiber concrete, the early-strength slow-setting effect of the steel fiber concrete is enhanced, and the tensile, bending, crack and impact resistant, fatigue resistant and toughness enhancing effects of the steel fiber concrete are improved, so that the service life of the steel fiber concrete is prolonged, the setting speed of the concrete is accelerated, and the construction period is shortened.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a schematic view showing the positions of the steel fiber concrete reinforcement layer and the inner film according to the present invention.
In the figure: 1. a well cover; 11. a well ring; 12. an inner membrane; 13. a wellbore; 14. a well base; 15. shale bricks; 16. a filler; 2. a steel fiber concrete reinforcing layer; 3. oil sticking of asphalt permeable layer; 4. asphalt concrete; .
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example (b): as shown in fig. 1 and 2, the construction method for reinforcement treatment around the manhole of the road inspection well comprises the following steps:
s1: excavation of a foundation pit: after the construction of the cement stabilized base of the inspection well is completed, a circle is drawn on the upper surface of the cement stabilized base by taking the centroid of the inspection well as the center so as to determine the area of the foundation pit and set the foundation pit into a circle with the diameter of 2 m. After the range of the foundation pit is determined, cutting is carried out on the upper surface of the second-layer asphalt of the cement stabilized base layer through a cutting saw, and then the cement stabilized base layer in the foundation pit is broken through by a worker through an air pick. The size of the broken water stabilization base layer is smaller than that of the foundation pit, the broken depth is 50cm below the elevation of the two-layer asphalt from the upper surface of the water stabilization base layer to the water stabilization base layer, and workers chisel the reserved edge part 15cm of the foundation pit through manual work, so that the pit wall of the foundation pit is guaranteed to be neat and smooth. After the cement stabilized base layer is broken, the staff cleans the impurities remained on the base and washes and wets the impurities with water before pouring concrete, so that the base is maintained, and the quality of the foundation pit is improved.
In the process of excavation of the foundation pit, excavation is conducted in a segmented and layered mode from top to bottom, workers need to check the width of the pit bottom in the excavation process, when the width of the pit bottom is insufficient, trimming is conducted to the designed elevation by taking every 1m as a dividing point, then slope repairing and bottom cleaning are conducted once in a unified mode, and the width and the elevation of the pit bottom are checked.
S2: shaft construction: the shaft 13 is a brick through shaft, and workers fill and level the part around the base well by using low-grade C15 concrete. In this step, the relation of well head height and reinforced concrete should be considered, but ensure that the well head can directly install framework of steel reinforcement.
S3: processing and installing steel bars: the staff processes the reinforcing bar into the steel reinforcement cage earlier, and the steel reinforcement cage includes two-layer hoop atress reinforcing bar net and sets up the fixed muscle that is used for supporting, fixed hoop atress reinforcing bar between two-layer hoop atress reinforcing bar net, and the welding of the upper and lower both ends of fixed muscle has the crotch. Staff hooks upper and lower two-layer hoop atress reinforcing bar and makes the crotch in towards the concrete through the crotch at the in-process of preparation steel reinforcement cage. And two layers of hoop stress reinforcing steel bar nets are arranged along the height direction of the foundation pit and are arranged along the circumferential direction of the well, each hoop stress reinforcing steel bar net comprises a plurality of vertical stress reinforcing steel bars and horizontal reinforcing steel bars, one horizontal reinforcing steel bar is bound outside each vertical stress reinforcing steel bar, the horizontal reinforcing steel bars and the vertical stress reinforcing steel bars are welded, and a plumb bob is used for correcting the spot welding position in the welding process. When the reinforcing steel bars are bound, the verticality of the reinforcing steel bars is controlled through the suspension wires.
After the reinforcement cage is processed, the staff installs the reinforcement cage in the reinforcement intracavity, closely leans on reinforcement cage and well periphery to make the axis of well periphery reinforcement cage aim at the axis of well head.
S4: manufacturing and installing an inner membrane: the staff makes into firm, the circular well head inner membrance 12 that is suitable for with the thickness of 0.5mm to paste well head inner membrance 12 at well head department, thereby play the restriction to strengthening the size, and strengthened the firm of back up coat.
S5: pouring concrete: after the inner membrane 12 is installed, workers form the steel fiber concrete reinforcing layer 2 by pouring C40 steel fiber concrete into the foundation pit, wherein the pouring depth is 5cm below the elevation of the two layers of asphalt pavements in the cement base course, and the two layers of asphalt pavements are flush with one layer of asphalt pavements in the cement base course. When the steel fiber concrete is poured, a worker uses the inserted vibrating rod to vibrate the steel fiber concrete until the surface of the steel fiber concrete is full of slurry and bubbles do not appear, and after the steel fiber concrete is poured, plastic cloth is covered and water is sprayed for maintenance.
The steel fiber concrete is formed by mixing cement, aggregate, fly ash, an additive and steel fibers, wherein the additive is a pumping aid. The pumping aid serving as an additive for improving the pumping performance of concrete has excellent water reducing and reinforcing effects and retarding and plastic retaining performances, so that the early-strength retarding effect of the steel fiber concrete is enhanced, and compared with common concrete, the pumping aid has the effects of tensile strength, bending resistance, crack resistance, impact resistance, fatigue resistance and toughness enhancement, so that the service life of the steel fiber concrete is prolonged, the setting speed of the concrete is accelerated, and the construction period is shortened.
By adding the steel fiber into the concrete, the stress concentration at the end part of the fine crack caused by the load on the base concrete is reduced, thereby controlling the expansion of the concrete crack and improving the crack resistance of the whole composite material. Meanwhile, because the interface between the concrete and the steel fiber has great interface cohesive force, the external force can be transmitted to the fiber with large tensile strength and high elongation, so that the steel fiber concrete is taken as a uniform whole, and the original tensile strength, bending strength and elongation at break of the concrete are obviously improved by resisting the action of the external force.
S6: elevation control: after the steel fiber concrete is vibrated, the worker controls the installation elevation of the well lid 1 according to four measured and positioned points by adopting a cross method, the installation elevation of the well lid 1 is controlled according to the height 4.2cm higher than the road surface of the cement stabilized base layer after the two-layer asphalt construction is completed, the worker can control the elevation of the well lid 1 through shale bricks 15 or concrete, the shale bricks 15 are used in the embodiment, fillers 16 or concrete are poured on the shale bricks 15 and the inner mold, and the inner mold is detached after the concrete is finally set.
S7: asphalt concrete construction: after the steel fiber concrete is finally set, workers roughen the laitance on the surface of the steel fiber concrete, brush the asphalt permeable layer viscous oil 3 on the upper surface of the steel fiber concrete, and then spread the asphalt concrete 4 on the upper surface of the asphalt permeable layer viscous oil 3, wherein the asphalt concrete 4 comprises a bottom surface layer asphalt concrete 4 positioned on the upper surface of the asphalt permeable layer viscous oil 3 and a top surface layer asphalt concrete 4 paved on the upper surface of the bottom surface layer asphalt concrete 4. When paving asphalt concrete 4, use small-size road roller to roll asphalt concrete 4, ensure that well lid 1 and road surface link up the department smooth-going to improve the comfort level of driving a vehicle. After the bottom surface layer asphalt concrete 4 is paved, the reverse embedding method is adopted for processing, the well cover 1 is installed, and then the top surface layer asphalt concrete 4 is paved. When the well lid 1 is installed, the height of the top of the well lid 1 is controlled to be 2mm higher than the designed height, and is consistent with a road slope, and when the asphalt concrete 4 of the top surface layer is paved, the top surface layer is directly connected with the well lid 1.
After the inspection well is installed in place, the elevation difference is controlled to be 4.2mm, a well ring 11 is installed in time, and the well cover 1 is covered. When the inspection well is positioned under a road, the well cover 1 is flush with the road; when the manhole is located in a green belt, the manhole cover 1 should be 0.1m higher than the ground.
The implementation principle of the method is that a foundation pit is excavated around the inspection well, a reinforcement cage is installed after a water-stable base layer in the foundation pit is broken, steel fiber concrete is poured, asphalt permeable layer viscous oil 3 is coated on the steel fiber concrete, asphalt concrete 4 is spread on the asphalt permeable layer viscous oil 3, the circumference of the inspection well is reinforced, and the cracking and sinking of the circumference of the inspection well are reduced; the steel fiber concrete is doped with the steel fibers and the pumping agent, so that the tensile strength, bending resistance, crack resistance, impact resistance, fatigue resistance and toughness of the steel fiber concrete are improved, and the possibility of cracking and sinking at the periphery of the inspection well is reduced.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (10)
1. The construction method for reinforcing the periphery of the road inspection well is characterized by comprising the following steps: the method comprises the following steps:
s1: excavation of a foundation pit: after the construction of the cement stabilized base layer of the inspection well is completed, determining a foundation pit on the upper surface of the cement stabilized base layer by taking the centroid of the inspection well as breaking the cement stabilized base layer in the foundation pit to form a reinforcing cavity;
s2: shaft construction: filling and leveling the periphery of the base well by concrete;
s3: processing and installing steel bars: installing a reinforcement cage in the reinforcement cavity, wherein the reinforcement cage comprises two layers of annular stress reinforcement meshes and fixing ribs arranged between the two layers of annular stress reinforcement meshes and used for fixing annular stress reinforcements, and the two layers of annular stress reinforcement meshes are arranged along the circumferential direction of the well;
s4: manufacturing and installing an inner membrane: a round inner membrane (12) made of iron sheet is sleeved at the wellhead;
s5: pouring concrete: pouring steel fiber concrete in the reinforcing cavity to form a steel fiber concrete reinforcing layer (2), wherein the steel fiber concrete reinforcing layer (2) is poured to the level of 5cm of the two layers of asphalt pavements in the cement stabilized base layer and is flush with the upper surface of one layer of asphalt pavement in the cement stabilized base layer;
s6: elevation control: the installation elevation of the well lid (1) is controlled by a cross method according to four points positioned by measurement;
s7: asphalt concrete construction: after the steel fiber concrete is finally set, the surface floating slurry is napped and coated with the asphalt permeable layer viscous oil (3), and then the asphalt concrete (4) is paved on the upper surface of the asphalt permeable layer viscous oil (3).
2. The reinforcement treatment construction method for the periphery of the road inspection well according to claim 1, characterized in that: and in the S1, the foundation pit is circular.
3. The reinforcement treatment construction method for the periphery of the road inspection well according to claim 2, characterized in that: the diameter of the foundation pit is 2 m.
4. The reinforcement treatment construction method for the periphery of the road inspection well according to claim 1, characterized in that: the water-stable base layer in the foundation pit in the S1 is specifically as follows:
1) cutting the upper surface of the second-layer asphalt by using a cutting saw;
2) breaking the water-stabilized base layer by using an air pick until the height of the second-layer asphalt is 50cm below the elevation;
3) the size of the broken cement stabilized base layer is smaller than that of the foundation pit.
5. The reinforcement treatment construction method for the periphery of the road inspection well according to claim 1, characterized in that: and in S5, when the steel fiber concrete reinforcing layer (2) is poured, vibrating by using an inserted vibrating rod.
6. The reinforcement treatment construction method for the periphery of the road inspection well according to claim 5, wherein: and (3) after the steel fiber concrete reinforcing layer (2) is poured in the S5, covering a plastic cloth and performing watering maintenance.
7. The reinforcement treatment construction method for the periphery of the road inspection well according to claim 6, wherein: and in the S5, the steel fiber concrete is prepared by mixing cement, aggregate, fly ash, an additive and steel fibers.
8. The reinforcement treatment construction method for the periphery of the road inspection well according to claim 7, characterized in that: the admixture is configured as a pumping agent.
9. The reinforcement treatment construction method for the periphery of the road inspection well according to claim 1, characterized in that: the mounting height of the well lid (1) in the S6 is 4.2cm higher than the upper surface of the second asphalt layer in the water stable base layer.
10. The reinforcement treatment construction method for the periphery of the road inspection well according to claim 1, characterized in that: and S7, after the construction of the asphalt concrete (4) is completed, installing the well lid (1), wherein the top height and the design elevation of the well lid (1) are higher by 2mm and are the same as those of a road slope.
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| CN202010261243.6A CN111441385A (en) | 2020-04-03 | 2020-04-03 | Construction method for strengthening treatment of periphery of road inspection well |
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| CN202010261243.6A CN111441385A (en) | 2020-04-03 | 2020-04-03 | Construction method for strengthening treatment of periphery of road inspection well |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112227502A (en) * | 2020-10-28 | 2021-01-15 | 中建七局安装工程有限公司 | Drainage inspection well construction method |
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| CN107313456A (en) * | 2017-06-26 | 2017-11-03 | 中国建筑局（集团）有限公司 | Municipal inspection well and reverse excavation construction method thereof |
| CN108411942A (en) * | 2018-04-18 | 2018-08-17 | 荣盛建设工程有限公司 | A method of with the repair of early strong strength self-compaction steel fiber reinforced concrete, reinforcing inspection shaft bearing |
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2020
- 2020-04-03 CN CN202010261243.6A patent/CN111441385A/en active Pending
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| CN107313456A (en) * | 2017-06-26 | 2017-11-03 | 中国建筑局（集团）有限公司 | Municipal inspection well and reverse excavation construction method thereof |
| CN108411942A (en) * | 2018-04-18 | 2018-08-17 | 荣盛建设工程有限公司 | A method of with the repair of early strong strength self-compaction steel fiber reinforced concrete, reinforcing inspection shaft bearing |
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| CN112227502A (en) * | 2020-10-28 | 2021-01-15 | 中建七局安装工程有限公司 | Drainage inspection well construction method |
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Application publication date: 20200724 |