CN215669972U

CN215669972U - Prefabricated shaft structure

Info

Publication number: CN215669972U
Application number: CN202120746926.0U
Authority: CN
Inventors: 张爱民; 谭建刚; 潘思璋; 郭耀龙; 孙慧颖; 徐文瑞; 姚燚; 黄云月
Original assignee: China Construction First Group Corp Ltd; Second Construction Co Ltd of China Construction First Group Co Ltd
Current assignee: China Construction First Group Corp Ltd; Second Construction Co Ltd of China Construction First Group Co Ltd
Priority date: 2021-04-13
Filing date: 2021-04-13
Publication date: 2022-01-28
Anticipated expiration: 2031-04-13

Abstract

The utility model discloses a prefabricated shaft structure which comprises a well chamber, a well wall, a first shaft arranged on the upper part of the well chamber, a brick shaft arranged on the outer side surface of the first shaft, a second shaft arranged between the well chamber and the first shaft, a prefabricated shaft ring arranged on the top surface of the first shaft, a manhole cover arranged on the top surface of the prefabricated shaft ring and a soil filling structure layer, wherein the top surface of the first shaft is flush with the top surface of the brick shaft; the diameter of the first wellbore is smaller than the diameter of the second wellbore; the bottom of the brick shaft is arranged at the connecting joint of the well wall and the second shaft, and the bottom of the brick shaft is flush with the bottom of the first shaft. The prefabricated shaft structure provided by the utility model adopts the prefabricated concrete shaft to replace a cast-in-place or built-in shaft, has strong controllability, shortens the construction period and is smoothly jointed with the construction of structural layer pavement. The construction process of 'lifting the well in sections and laying along with lifting' is adopted, so that the construction phenomenon of 'digging along with laying' in the traditional construction process is avoided, and the idle work and the repeated work are reduced.

Description

Prefabricated shaft structure

Technical Field

The utility model relates to the technical field of municipal engineering construction, in particular to a prefabricated shaft structure.

Background

A rain sewage inspection well in municipal engineering is a throat main road of an underground drainage facility, and in order to ensure the construction quality of the rain sewage inspection well, the stability, strength, structural dimension, elevation and the like of the inspection well in the well lifting construction process need to be ensured to meet the design requirements.

At present, among the municipal works, rain sewage inspection shaft pit shaft is mostly brick structure or cast-in-place concrete structure, and traditional well construction process that rises mainly has two kinds: a technology for constructing or in-situ pouring a manhole shaft whose height is same as the height of the structural layer of said manhole includes such steps as building or in-situ pouring a temporary cover, spreading and rolling the structural layer, curing, and constructing the structural layer of road.

The other process is that after the construction of the road bed is finished and the shaft of the inspection well is constructed to the top of the road bed, the temporary cover plate is covered and the structural layer is paved and rolled, then the position of the inspection well is laid out for reverse excavation, and the position of the shaft is excavated for masonry or cast-in-place concrete.

In conclusion, the current inspection well lifting construction method has the defects of long construction period, engineering cost waste, environmental pollution, complex process and the like, and has the problems of different colors and luster of the road surface, poor integrity, easy damage and the like after the construction is finished.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a prefabricated shaft structure and aims to solve the technical problems of long construction period, high cost, serious environmental pollution and the like of the lift of an inspection well.

In order to achieve the purpose, the utility model adopts the following technical scheme: the utility model provides a prefabricated shaft structure which comprises a well chamber, a well wall, a first shaft arranged on the upper part of the well chamber, a brick shaft arranged on the outer side surface of the first shaft, a second shaft arranged between the well chamber and the first shaft, a prefabricated shaft ring arranged on the top surface of the first shaft, a manhole cover arranged on the top surface of the prefabricated shaft ring and a soil filling structure layer, wherein the top surface of the first shaft is flush with the top surface of the brick shaft;

the diameter of the first wellbore is smaller than the diameter of the second wellbore;

the bottom of the bricked shaft is arranged at a connecting joint of the well wall and the second shaft, and the bottom of the bricked shaft is flush with the bottom of the first shaft;

the soil filling structure layer of the second shaft comprises well filling soil filled around the well chamber, a cement soil roadbed arranged on the upper part of the well filling soil, a cement stabilizing layer arranged on the upper part of the cement soil roadbed and an asphalt concrete surface layer; the prefabricated walling crib comprises at least three unit prefabricated walling cribs.

Further, the cement stabilization layer includes a cement stabilized macadam underlayment and a cement stabilized macadam base layer.

Further, the thickness of the cement stabilized macadam sub-base is two thirds of the thickness of the cement stabilized macadam base.

Further, a mortar cushion layer is arranged on the periphery of the prefabricated walling crib; the mortar cushion layer adopts dry and hard waterproof cement mortar.

Furthermore, the outer side surface of the prefabricated walling crib is flush with the bricklaying shaft.

Further, the height of the unit prefabricated walling crib is at least 5 cm.

Further, the top surface of inspection shaft lid and the top surface parallel and level of asphalt concrete surface course.

Further, the top surface of the filling soil around the well is lower than the top surface of the first shaft.

The utility model has the beneficial effects that:

the prefabricated shaft structure provided by the utility model adopts the prefabricated concrete shaft to replace a cast-in-place or built-in shaft, has strong controllability, shortens the construction period and is smoothly jointed with the construction of structural layer pavement.

2, the construction process of 'lifting the well in sections and paving along with lifting' is adopted, so that the construction phenomenon of 'digging along with paving' in the traditional construction process is avoided, and the idle work and the repeated work are reduced.

And 3, as the shaft is prefabricated in a centralized manner in a factory, the shaft is only simply installed on site and is not limited by professional constructors such as a template worker and a steel bar worker, and the quality control key points such as the size, the straightness and the surface flatness of the shaft are ensured.

4, on-site masonry or pouring operation is not needed, the construction efficiency is high, the site requirement is low, the pollution is low, the noise is low, and the environmental protection performance is high.

Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the utility model. The primary objects and other advantages of the utility model may be realized and attained by the instrumentalities particularly pointed out in the specification.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings.

Fig. 1 is a schematic structural view of the present invention.

Reference numerals: 1-well room, 2-well wall, 3-first well shaft, 4-bricked well shaft, 5-second well shaft, 6-unit prefabricated well ring, 7-inspection well cover, 8-well periphery filling, 9-cement soil roadbed, 10-cement stabilized macadam subbase layer, 11-asphalt concrete surface layer, 12-cement stabilized macadam base layer and 13-mortar cushion layer.

Detailed Description

The technical solutions of the present invention are described in detail below by examples, and the following examples are only exemplary and can be used only for explaining and illustrating the technical solutions of the present invention, but not construed as limiting the technical solutions of the present invention.

Examples

As shown in FIG. 1, the utility model provides a prefabricated shaft structure, which comprises a well chamber 1, a well wall 2, a first shaft 3 arranged at the upper part of the well chamber 1, a bricked shaft 4 arranged at the outer side surface of the first shaft 3, a second shaft 5 arranged between the well chamber 1 and the first shaft 3, a prefabricated walling crib arranged on the top surface of the first shaft 3, an inspection well cover 7 arranged on the top surface of the prefabricated walling crib and a soil filling structure layer, wherein the top surface of the first shaft 3 is flush with the top surface of the bricked shaft 4;

the diameter of the first wellbore 3 is smaller than the diameter of the second wellbore 5;

the bottom of the bricked shaft 4 is arranged at the connecting node of the well wall 2 and the second shaft 5, and the bottom of the bricked shaft 4 is flush with the bottom of the first shaft 3;

the soil filling structure layer of the second shaft 5 comprises well filling soil 8 filled around the well chamber 1, a cement soil road bed 9 arranged on the upper part of the well filling soil 8, a cement stabilizing layer arranged on the upper part of the cement soil road bed 9 and an asphalt concrete surface layer 11; the prefabricated walling crib comprises at least three unit prefabricated walling cribs 6. The cement stabilized bedding comprises a cement stabilized macadam underlayment 10 and a cement stabilized macadam base layer 12. The cement stabilized macadam underlayment 10 is two-thirds as thick as the cement stabilized macadam base 12.

Wherein, the periphery of the prefabricated walling crib is also provided with a mortar cushion layer 13; the mortar cushion layer 13 is made of dry and hard waterproof cement mortar. The outer side surface of the prefabricated walling crib is flush with the bricklaying shaft 4. The height of the unit prefabricated walling crib 6 is at least 5 cm. The top surface of the well filling 8 is lower than the top surface of the first well shaft 3. The top surface of the manhole cover 7 is flush with the asphalt concrete surface layer 11.

The construction method comprises the following steps:

step one, prefabricating a shaft: and prefabricating each section of shaft according to the thickness of a road structure layer, wherein the shaft is spliced on the ground in a trial mode in a tongue-and-groove mode.

Step two, cushion layer construction: after the construction of the soil-water soil roadbed is completed, a layer of dry and hard waterproof cement mortar which is 20cm wider than the outer edge of the prefabricated shaft is poured on the top surface of the roadbed according to the well position, and the effect of compaction and water prevention is achieved after the first section of prefabricated shaft is grouted.

Step three, installing a first section of prefabricated shaft: after the 50cm range around the well is cleaned, a truck crane or a small-sized movable hanger is adopted for opening alignment, and a four-corner hoisting mode is adopted, so that the well slowly and stably falls to prevent damage; meanwhile, the steps of the first section of prefabricated shaft and the pre-buried steps in the well chamber 1 are in the same direction.

Fourthly, paving the cement stabilized macadam subbase 10: before water is paved stably, an temporary cover plate (steel plate) is covered, 3 or 4 steel bars are implanted into the prefabricated shaft by using a percussion drill hole, so that the temporary steel plate is fixed, the steel plate and the prefabricated shaft are prevented from horizontal displacement in the paving and rolling process, and the material is prevented from penetrating into the well or influencing the construction quality. In the water-stable paving process, a small-sized compaction machine can be used for compacting the water stability around the prefabricated shaft in advance, so that the compactness of cement-stabilized macadam around the inspection well is ensured, then the whole compaction process of a water-stable layer is carried out, and the construction of the cement-stabilized macadam foundation 12 is strictly constructed according to the CJJ 1-2008 specification of urban road engineering construction and quality acceptance. And after the base layer construction is finished, watering and maintaining to keep moist, sealing traffic during maintenance, wherein the maintenance period is generally 7d, and a section of prefabricated shaft is arranged on a detachable temporary steel plate after the maintenance is finished.

Step five, connecting the prefabricated well casing: when the second section of shaft is hoisted, the second section of shaft is slowly sleeved into the first section of shaft, the prefabricated shaft is adjusted to avoid collision, the direction of the step is ensured to be consistent with that of the previous section, and the construction is carried out until the installation is finished. The tongue-and-groove connection between each section and the prefabricated shaft with the same thickness of the structural layer adopts 1:2 waterproof cement mortar for pointing, and the joint at the inner side is pointed and sewed by primary pulp.

Step six, paving the following layers in the asphalt concrete:

and repeating the fourth step and the fifth step, and constructing the lower base layer, the third section of well casing joint height and the upper base layer in sequence. And (4) repeating the step 1 in the step (4), arranging a temporary cover plate, paving a middle and lower surface layer of the asphalt concrete, and constructing the asphalt concrete according to the urban road engineering construction and quality acceptance criterion CJJ 1-2008 strictly.

Step seven, installing the well cover: three phi 12 anchor bolts are embedded in the prefabricated shaft, and the height of each bolt is not more than 2/3 of the thickness of the well cover seat. And (3) installing a well cover seat, finely adjusting the elevation of the well cover, and adopting a well-shaped hanging wire in the fine adjustment range of 2-3m outside the well wall. The adjusting nut below the cover seat is rotated to adjust, and the fixing nut above the cover seat is screwed up in time after the adjusting nut is adjusted. After the nut is determined not to be loosened, C25 fine stone concrete is adopted to pour the periphery of the well cover, a small amount of concrete is taken firstly during pouring to fill the concrete at the bottom of the well cover seat, plugging measures should be taken for the gap in the well to prevent slurry leakage, the concrete around the well can be poured after the concrete at the bottom of the well seat is dense, the concrete is compacted by vibration, and the well is covered by water for watering and maintenance.

Step eight, paving the upper layer of the asphalt concrete: after the concrete is finally set, the concrete needs to be maintained for 2 days in summer, and needs to be maintained for 3-4 days in a low-temperature period, and after the strength is ensured, the upper asphalt concrete layer is paved. When the upper layer of the asphalt concrete is constructed, a small steel wheel road roller is used for repeatedly rolling the periphery of the inspection well, so that the compactness of the asphalt concrete around the inspection well is ensured.

The structure provided by the utility model can effectively reduce the construction cost, save the construction time, accelerate the well completion speed and ensure the safety and reliability of the construction process.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that may be made by those skilled in the art within the technical scope of the present invention will be covered by the scope of the present invention.

Claims

1. Prefabricated pit shaft structure, its characterized in that: the well comprises a well chamber (1), a well wall (2), a first shaft (3) arranged on the upper part of the well chamber (1), a brick shaft (4) arranged on the outer side surface of the first shaft (3), a second shaft (5) arranged between the well chamber (1) and the first shaft (3), a prefabricated walling crib arranged on the top surface of the first shaft (3), an inspection well cover (7) arranged on the top surface of the prefabricated walling crib and a soil filling structure layer, wherein the top surface of the first shaft (3) is flush with the top surface of the brick shaft (4);

the diameter of the first shaft (3) is smaller than that of the second shaft (5);

the bottom of the bricked shaft (4) is arranged at the connecting joint of the well wall (2) and the second shaft (5), and the bottom of the bricked shaft (4) is flush with the bottom of the first shaft (3);

the soil filling structure layer of the second shaft (5) comprises well filling soil (8) filled around the well chamber (1), a cement soil road bed (9) arranged on the upper part of the well filling soil (8), a cement stabilizing layer arranged on the upper part of the cement soil road bed (9) and an asphalt concrete surface layer (11); the prefabricated walling crib comprises at least three unit prefabricated walling cribs (6).

2. The prefabricated wellbore structure of claim 1 wherein the cement-stabilized bedding comprises a cement-stabilized macadam sub-base (10) and a cement-stabilized macadam base (12).

3. The prefabricated wellbore structure of claim 2 wherein the cement stabilized macadam sub-base (10) has a thickness of two-thirds the thickness of the cement stabilized macadam base (12).

4. A prefabricated shaft structure according to claim 1, characterized in that the prefabricated well collar is further provided with a mortar bed (13) at its peripheral edge; the mortar cushion layer (13) adopts dry hard waterproof cement mortar.

5. A prefabricated shaft structure according to claim 1, characterized in that the outer side of the prefabricated walling crib is flush with the bricklayed shaft (4).

6. A prefabricated wellbore structure according to claim 1, characterized in that the height of a unit prefabricated wellpath (6) is at least 5 cm.

7. Prefabricated shaft structure according to claim 1, characterized in that the top surface of the manhole cover (7) is flush with the top surface of the asphalt concrete top layer (11).

8. A prefabricated shaft structure according to claim 1, characterized in that the top surface of the well filling (8) is lower than the top surface of the first shaft (3).