CN113737858B

CN113737858B - Construction method for embankment before well

Info

Publication number: CN113737858B
Application number: CN202110720797.2A
Authority: CN
Inventors: 戴振华
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-06-28
Filing date: 2021-06-28
Publication date: 2023-03-21
Anticipated expiration: 2041-06-28
Also published as: CN113737858A

Abstract

The invention belongs to the technical field of municipal engineering, and particularly provides a construction method for embankment before well, which comprises the following steps: constructing a embankment, a pipeline and a well bottom, closing up the well bottom, additionally installing a well bottom cover plate, measuring and positioning the center of the well bottom cover plate, constructing a roadbed and a pavement base layer, measuring and positioning the well center, drilling and digging a well hole, taking out the well bottom cover plate, cleaning the closing up of the well bottom, additionally paving cement mortar, hoisting the well body, measuring the well body elevation, installing an elevation adjusting block, hoisting a well cover seat, installing an inner mold between the well body and the well cover seat, filling the periphery of a filling body to be below the top of the well body, installing the pavement base layer to an outer mold below the top of the well cover seat, pouring concrete and installing the well cover; the invention solves the problems that the well is easy to damage, the surrounding of the well is not uniformly settled, the driving safety and driving comfort are influenced, and the maintenance frequency and the maintenance cost are increased.

Description

Construction method for embankment before well

Technical Field

The invention belongs to the technical field of municipal engineering, and particularly relates to a construction method for embankment before well.

Background

Various pipeline inspection wells of municipal engineering are weak links of municipal road engineering quality and driving (pedestrian) safety, the inspection wells (for short, wells) usually adopt a process of manually building bricks and lifting the wells for multiple times (also called a well-first embankment-later process), road foundation filling is carried out after the wells are built at a certain height, large-scale compaction equipment is not easy to be close to the periphery of the wells, the embankment compactness of the periphery of the wells is low, the wells are often damaged when being close to the embankment, the wall of the well is damaged, roadbed fillers are greatly filled in pipelines with people by rainwater, and the like, so that the wells and the periphery are settled, uneven settlement is generated at the periphery of the roads and the wells, the unevenness of the road surfaces is rapidly increased, the premature damage of the roads at the periphery of the wells is caused, the driving comfort is also rapidly deteriorated, meanwhile, the impact force of vehicle loads on the wells and the wells is increased, the premature damage of the wells and traffic accidents are caused. Building rubbish in the pipeline can not thoroughly be cleaned before handing over, pipeline people with small pipe diameters can not enter the pipeline at all, the excess water quantity of the pipeline can not be greatly reduced due to the fact that the pipeline people cannot clean the pipeline, and the probability of waterlogging in cities is increased. There is a need for a new technology and process to substantially solve the above problems.

1. Conventional municipal well construction procedures, parameters, processes and problems

Basic working procedure of conventional municipal well construction operation

1. The construction of the conventional municipal well adopts a well-first dike-after-well method process, and the basic procedures are as follows:

embankment construction → pipeline construction → well location determination → shaft bottom construction → well wall masonry → plastering inside and outside the well wall, when the well is raised to a certain height (usually about 100CM for each well lift), then → embankment construction is started again → well wall masonry and plastering construction are started again → embankment construction is carried out again, and the process is repeated until a pavement surface layer is constructed.

2. The basic procedures for installing a conventional well cover seat (well cover) are as follows:

the construction process of the cast-in-place well cover seat comprises the following steps: construction preparation → well cover seat positioning, cutting off a base layer and a middle surface layer of a pavement → well head reinforcing steel bar processing and forming → shaft cleaning → well cover template positioning → concrete pouring (after curing for 7 d) → well cover installation → asphalt upper surface layer construction;

the construction process of the prefabricated well cover seat comprises the following steps: construction preparation → positioning of the well cover seat, cutting off a base course of a pavement and a middle course → cleaning a shaft, and then installing and positioning the well cover seat by two methods.

One is that cement mortar or fine grain type concrete is spread on the shaft installation base surface, then the shaft cover seat is seated, and the height-adjusting Cheng Zai pours the concrete in the installation groove on the periphery of the shaft cover. The other method is that the well cover seat is firstly arranged on the shaft installation base surface, the height is adjusted by bricks, concrete blocks or even stones, then cement mortar under the well cover seat is filled, and concrete in the installation groove at the periphery of the well cover is poured.

(II) main technical parameters for conventional municipal well key control and current construction control condition

(1) After the municipal pipeline foundation trench is dug, the substrate is tamped and leveled, and the compaction degree of the substrate is the same as that of backfill of the trench of the road (or square) and is not less than 93 percent. Construction can be generally achieved at present.

(2) The strength grade of the concrete poured at the bottom of the pipeline well is not less than C10, the shale brick (not less than MU 10) is used for the well wall, the cement mortar is not less than M10, the mortar plumpness is not less than 80%, when the well depth exceeds 1500mm, the thickness of the masonry at the lower part is wider than that at the upper part by at least 120mm from the lower part of the well mouth; if a round well is built, the contraction gradient within the range of 1000mm downward from the well mouth is not less than 1/10, but is not too large, otherwise, the well wall is easy to crack during heavy load transmission. The mortar strength, mortar plumpness, deep well's brickwork thickness and adduction divide the slope control of construction at present are relatively poor, influence the bulk strength and the crushing resistance of structure.

(3) Before the well wall is bricked, the bricks are thoroughly poured by water so as to enhance the bonding force between the bricks and mortar; the thickness of the inner and outer plasters is preferably not less than 25mm after the well wall is built, the mixing ratio of the mortar is preferably 1: 2.5, the well is stopped for 5 to 7 days (after the mortar among the bricks is solidified and stabilized) and then plastered, and water is sprayed for maintenance for not less than 3 days after the plastering; the back gap of the round well is large, mortar is firstly used to throw the gap fully before plastering, and then plastering is carried out, so that the integral rigidity is increased. At present, the multipurpose dry brick masonry, plastering thickness, mortar mix proportion, construction period and maintenance period in a construction site can not be effectively ensured, and the masonry quality is poor.

(4) When the well cover is constructed, the slope of the well mouth position and the road surface (square) needs to be determined firstly, the consistency of the well ring, the well cover and the road surface is ensured, the height difference between the well cover and the surrounding road surface is +/-3 mm, the concrete thickness is preferably 200mm, and the strength is C25 or C30 grade. At present, the height difference between a well lid and a surrounding pavement, which is generated by the settlement of a shaft and peripheral concrete caused by the construction process problem, cannot be controlled within +/-3 mm, the technical parameters of the well lid can be ensured during the installation and the positioning, but the height change is large after the vehicle is started.

(5) Before the well lid base is installed, the top of the well wall is cleaned and washed by clean water. Because the water is inconvenient to pull in the field, the water is rarely used for washing, and the condensation performance of the cast-in-place concrete and the base of the well and the well lid is reduced.

(6) The bound reinforcing steel bars, the bound templates or the installed prefabricated well cover seat must be accurately and stably positioned, the templates are supported or the concrete is poured after the positioning, the concrete is tamped and compacted, and after the concrete is finally set, the concrete is watered and maintained for not less than 7 days. But are generally not cured with water.

(7) When the manhole cover base is positioned and installed by mortar, a wooden hammer is used for beating the manhole ring when the manhole ring is pulled or laid horizontally, so that the manhole ring is in full contact with the plastic concrete and is laid into the concrete. The elevation of the well lid base is not accurately controlled.

(8) If the pavement is asphalt concrete, the C25-grade concrete with the thickness of at least 200mm is poured under the well ring, and the well ring is preferably 3-5cm lower than the concrete pavement.

(9) The prefabricated well cover is made of concrete not lower than C25 level.

(III) conventional outside-well and inside-well backfill process and requirements

(1) The out-of-well mechanical backfill must not touch the well body. Manual and up-down jumping rammers (or hydraulic rammers) are used for ramming and compacting the periphery of the well body according to the requirement that the compaction is not more than 25 CM/layer, and the well body cannot be touched during ramming operation. But are generally susceptible to impact with the well or to damage from large external pressure when the strength of the well is not reached.

(2) The well can be filled with a cement bag filled with sand, and a wood plate and a square wood are used for supporting a well cavity so as to prevent the well from being damaged when the well is filled outside; and after the filling outside the well is finished, taking out the filling or supporting inside the well and cleaning the filling or supporting inside the well. But often very few organize the construction according to the requirements of the process.

(IV) general well construction quality general problems

According to the construction operation procedures of the conventional well, main control technical parameters, backfill process requirements, frequent diseases of the municipal well and the like, the following problems and disadvantages of the conventional well construction process can be easily obtained;

1. in terms of the concrete (mortar) strength generation period, the layered well raising procedure and the layered filling process related in the process flow, the construction procedure has the advantages that the influences of the well strength generation and the layered well raising process are greatly received, the number of cross operations is large, the procedures are not easy to join, and the roadbed construction efficiency is reduced;

2. the municipal well points are more, large mechanical equipment can not continuously operate, if filling construction is strictly carried out according to the technological requirements, equipment such as a jumping rammer, a generator (or a hydraulic rammer) and the like is additionally arranged, and the mechanical operation efficiency is lower comprehensively;

3. the inside and outside inspection of the brick-built well is inconvenient, the thickness of the well body masonry and the inward contraction gradient of the well mostly cannot meet the standard requirements, and the stress is influenced; the quality of bricks and mortar for masonry and the control of the construction process in the whole process of a construction site can be rarely made in place, the quality of a well body and the capacity of bearing external loads are seriously influenced, and the quality of a brick-built well is poor;

4. the road base pressure is real-time, and the road base easily collides the well body, and the well self intensity is low, and the ability of resisting vibrations external force is poor, and the well body is very easily destroyed. The road bed filler enters into the pipeline through the damaged well body very easily under the operation of rainwater, also pours part of filler into from the well head easily when the road bed topples over the filler in addition, because the operation space is restricted in the pipeline, the manual work gets into inside clearance difficulty, and difficult thorough clean up fills the pipeline, and the pipeline drainage is influenced seriously to the serious reason, is the big factor that causes urban waterlogging.

5. The roadbed is affected by the inspection well when being filled, large-scale compaction equipment cannot be compacted close to the inspection well, the filling around the well is also rarely assisted by tools such as jumping rams and hydraulic hammers, so that the compaction degree around the well is greatly lower than that of the roadbed, the local unevenness of the well cover and the periphery of the road is increased quickly after the road passes, the impact load of vehicles on the well cover is increased, the factors such as overload are added, the well cover is seriously damaged after passing, and the driving (pedestrian) safety is seriously affected;

6. in recent years, the labor cost is high, and the cost of manually lifting the well and the cost of manually cleaning the filler and the garbage in the pipeline are multiplied;

7. the well mouth needs to be protected in the construction process, and the safety protection measure cost of the well mouth is high;

8. in construction, working faces need to be changed frequently, time intervals of well raising construction and tamping operation around a well are provided, safety passing of vehicles is influenced, all the working procedures need to be coordinated frequently in a crossed mode, and management coordination force is increased;

9. when a road is constructed by the traditional process of firstly drilling the well and then diking, the road surface around the well, the well and the well cover are easy to damage due to the defects of the process, the maintenance frequency is high, and the maintenance cost is high.

Disclosure of Invention

The invention provides a construction method for diking first and then well, which aims to solve the problems that inspection wells of various municipal pipelines are easy to damage, the periphery of the well is not uniformly settled, the driving safety and the driving comfort are influenced, and the maintenance frequency and the maintenance cost are increased; the second purpose is to overcome the problems that various pipelines are easily blocked by building garbage, the garbage is inconvenient to clean, the cost is high, and the drainage, pollution discharge and use functions are influenced when the cleaning is not thorough in the conventional municipal well construction process.

Therefore, the invention provides a construction method for diking and well-after-well, which comprises the following steps:

1) Constructing an embankment, pipelines and a well bottom, and closing up the well bottom after construction is finished;

2) Additionally installing a bottom cover plate at the bottom of the closed hole, and measuring and positioning the center of the additionally installed bottom cover plate;

3) Constructing a roadbed and a pavement base, measuring and positioning the well to be excavated according to the center position of the well bottom cover plate positioned in the step 2) after construction is finished, drilling and excavating a well hole at the well to be excavated until the well bottom cover plate is taken out and the well bottom closing-in is cleaned, and paving cement mortar on the cleaned well bottom closing-in;

4) The construction method comprises the steps of installing a well body at the bottom of a well, splicing and combining well pipes to form the well body, measuring the elevation of the well body after the installation is finished, installing an elevation adjusting block at the upper end of the well body according to the measuring result, installing a well cover seat on the elevation adjusting block, installing an inner mold of a section needing to be cast in situ between the well body and the well cover seat, filling the periphery of the well body to the position below the top of the well body with filling materials, installing an outer mold of a section needing to be cast in situ between a pavement base layer and the section below the top of the well cover seat, pouring concrete between the inner mold and the outer mold, and installing the well cover on the well cover seat to finish the construction.

And a plurality of hoisting holes are symmetrically formed in the well bottom cover plate and the well pipe.

Before the roadbed construction, the hoisting hole of the shaft bottom cover plate needs to be covered.

The well pipe comprises a standard pipe section with a primary-secondary interface and an adjusting pipe section.

The thickness of the cast-in-place concrete section between the well body and the well cover seat is 5-20CM.

The length of the elevation adjusting block is less than 2CM of the wall thickness of the well pipe.

The elevation adjusting block comprises an adjusting block with an anti-falling net hook and an adjusting block without the anti-falling net hook.

The centre form comprises two sets of modules of symmetry, connects through adjustable lead screw between the module.

A suspension cage and a ladder are arranged in the drilled well.

The invention has the beneficial effects that:

1. according to the construction method of the dike first and the well second, the well pipe and the elevation adjusting block can be prefabricated, and the construction method is suitable for large-area construction and popularization;

2. according to the construction method of the prior dike and the subsequent well, the well body adopts the prefabricated well pipe and the prefabricated elevation adjusting block, the filling material with better fluidity, easy compaction and relatively good modulus (C15 self-compacting concrete or fluid fly ash) is adopted for backfilling the periphery of the well, the integral quality of the well and the periphery is improved, the settlement quantity of the well and the periphery is very small, the unevenness degree of the well and the periphery after the vehicle is communicated is not changed greatly, the driving comfort is high, the impact load of the well and the well cover on the vehicle is small, the damage rate of the well and the well cover is greatly reduced, the maintenance cost is reduced, the road driving noise is reduced, and the like, and the problems of poor filling quality, low compaction degree and the like of the periphery of the inspection well are thoroughly solved;

3. the construction method for embankment and well in sequence provided by the invention avoids the outstanding problems of safety accidents, low working efficiency, low mechanical construction efficiency and the like easily caused by cross construction and procedure connection, improves the safety environment of construction operation, greatly improves the mechanical operation efficiency and improves the overall compactness of a roadbed;

4. according to the construction method of the dike and the well, the roadbed is built firstly, then the well hole is dug, and the prefabricated well pipe and the prefabricated elevation adjusting block are used for replacing the traditional brick well, so that no roadbed filler and building garbage flow in the pipeline is well ensured, the water passing amount of the pipeline can be fully ensured, and waterlogging caused by pipeline blockage is prevented from occurring from the construction source;

5. according to the construction method of the dike first and the well second, the processes of taking out the shaft bottom cover plate → cleaning the shaft bottom closing up and paving cement mortar need to be assisted by manpower and go to the shaft bottom, the rest are all mechanical operation, the roadbed filling avoids the influence of the cross construction process of the construction well, the roadbed filling is large-area construction and the like, the labor input in the whole process is few, the mechanical construction efficiency is high, and the construction cost is obviously saved.

Detailed Description

Example 1:

a construction method for embankment before well comprises the following steps:

1) Constructing the embankment, the pipeline and the shaft bottom, and closing the shaft bottom after the construction is finished;

4) Installing a well body (namely well pipes, wherein the well body is formed by splicing and combining the well pipes), measuring the elevation of the well body after the installation is finished, installing an elevation adjusting block at the upper end of the well body according to the measuring result, installing a well cover seat on the elevation adjusting block, installing an inner mold of a section needing to be cast in situ between the well body and the well cover seat, filling filler into the position from the periphery of the well body to the position below the uppermost section of well pipe, installing an outer mold of a section needing to be cast in situ from a pavement base layer to the section below the top of the well cover seat, pouring concrete between the inner mold and the outer mold, and installing the well cover on the well cover seat to finish the construction.

Cleaning a shaft bottom closing up, and paving cement mortar on the cleaned shaft bottom closing up, so that the coagulability of the shaft bottom closing up and a well pipe can be improved; the technical parameters of construction of the embankment, the pipeline and the well bottom, including the technical parameters and the process of paving cement mortar, are the same as those of the conventional process;

the well casing is a prefabricated well casing, the well body is formed by splicing prefabricated well casings, the prefabricated well casing comprises a prefabricated standard well casing and a prefabricated adjusting well casing, the prefabricated standard well casing usually adopts a sub-opening and main opening process, the main opening end of a first standard well casing at the well bottom is connected and sealed with a well bottom closing surface by using spread cement mortar, the standard well casings spliced by other well casings are sealed and connected by adding rubber sealing rings at the sub-opening ends, the prefabricated adjusting well casing (one section of 20-30 CM) usually adopts a double (two ends) main opening process, the standard well casing is sealed and connected with the adjusting well casing by using the rubber sealing rings, the adjusting well casing is sealed and connected with the adjusting well casing by using the cement mortar, and the prefabricated well casings are installed by hoisting the prefabricated well casings into the well casings in sections;

the elevation of the well body is adjusted, the well body can generate elevation (height) errors in 20CM when a prefabricated concrete standard joint and an adjusting joint well pipe are assembled, the requirement of designing the elevation errors of +/-3 MM is met, and the prefabricated concrete adjusting block and the prefabricated steel plate adjusting block are required to be adopted for accurate assembly so as to meet the requirement of design precision. In the general Centimeter (CM) precision adjusting range, a prefabricated concrete elevation adjusting block small component (described later) is adopted to be prefabricated into a prefabricated elevation adjusting block with the thickness of 5-20CM (each 1CM is taken as a specification model); in the millimeter (MM) precision adjustment range, a thin steel plate is generally adopted and processed into small steel plates with the thickness of 1-4MM (every 1MM is taken as a specification model). The two elevation adjusting blocks are matched with the prefabricated concrete standard knot, the prefabricated adjusting knot well pipe and the prefabricated well cover seat to meet the precision requirement of design, and after the elevation adjusting blocks are assembled to the designed elevation, the elevation adjusting blocks and the well cover seat are cast in situ into a whole by concrete, so that the construction of the well is completed.

According to the construction method of the dike first and the well second, the well pipe and the elevation adjusting block can be prefabricated, and the construction method is suitable for large-area construction and popularization; because the roadbed is built and then the well hole is dug, the prefabricated well pipe and the prefabricated elevation adjusting block are used for replacing the traditional brick well, no building rubbish and roadbed filler flow in the pipeline is well ensured, the water passing amount of the pipeline can be fully ensured, and waterlogging caused by pipeline blockage is prevented from occurring from a construction source; by using the prefabricated well pipe, the prefabricated elevation adjusting block and the like, the overall quality of the well and the periphery is improved, the settlement of the well and the periphery is small, the unevenness degree of the well and the periphery after the vehicle is communicated is not changed greatly, the driving comfort is high, the well and the well cover are subjected to small impact load of the vehicle, the damage rate of the well and the well cover is greatly reduced, the maintenance cost is reduced, the road driving noise is reduced and the like, and the method thoroughly solves the problems of poor filling quality, low compactness and the like of the periphery of the inspection well; the outstanding problems of safety accidents, nest work, low mechanical construction efficiency and the like easily caused by cross construction and procedure connection are avoided, the safe environment of construction operation is improved, the mechanical operation efficiency is greatly improved, and the overall compactness of the roadbed is improved; according to the construction method for diking before well, the processes of taking out the shaft bottom cover plate → cleaning the shaft bottom closed-up → paving cement mortar need to be assisted by manual work when going to the shaft bottom, and the rest are mechanical operation, so that the construction efficiency is high, and the labor cost is reduced.

Example 2:

on the basis of embodiment 1, further, a plurality of lifting holes are symmetrically formed in the well bottom cover plate and the well casing. The hoisting hole is convenient for assembly. Preferably, the number of the hoisting holes of the shaft bottom cover plate is 2, the diameter of each hoisting hole is 6cm, the structure is simple, and the hoisting can be stably carried out when the hoisting device is used; in actual use, the number and the size of the hoisting holes can be selected according to actual conditions so as to meet hoisting requirements.

The concrete strength of the bottom cover plate is C30, the diameter is the external diameter of a well pipe plus 10CM, and the reinforcing bar and the thickness of the bottom cover plate are subject to the technical parameters provided by a design unit; the thickness of a well bottom cover plate of a well below 120CM is 30-35CM, and double layers of 14 twisted steel bars are adopted for reinforcement; the well bottom cover plate has high strength, and can sufficiently bear the impact force of a vehicle on the well bottom cover plate after covering a soil layer, so that the damage rate of the well bottom cover plate in the using process is reduced.

Furthermore, before roadbed construction, the hoisting hole of the shaft bottom cover plate needs to be covered. Before roadbed construction, hoisting holes of a shaft bottom cover plate are covered, so that the problems that construction waste and roadbed fillers enter a shaft bottom through the hoisting holes or the hoisting holes are blocked, the shaft bottom is blocked at the back, and hoisting cannot be performed through the hoisting holes are solved; the hoisting hole cover is made of thick paper boards or thin plywood, and can also be made of other materials on site.

Further, the well pipe comprises a standard pipe section with a primary-secondary interface and an adjusting pipe section with a double-primary interface. The standard pipe section length with the female connector comprises 50CM, 100CM, 200CM and 300CM, and the length of the adjusting pipe section with the double female connector is 20-30 CM; in practical use, the number of the standard pipe joints with the female joint and the number of the adjusting pipe joints with the double female joints are multiple, and the well pipe is formed by connecting multiple standard pipe joints with marks in series, or the well pipe is formed by connecting multiple standard pipe joints with marks and adjusting pipe joints in series to form the well pipe; the adjusting pipe section with the length of 20-30CM is convenient for adjusting the height of the well cover seat correspondingly; the standard pipe joint installed on the lowest section has its female port downward and its male port upward for connection with the mortar at the mouth of the well and the female port of the upper well pipe, and the adjusting pipe joints have female ports for installation of elevation adjusting blocks for connection with mortar or concrete.

Furthermore, the thickness of the cast-in-place concrete section between the well body and the well cover seat is 5-20CM. The well body and the well cover seat belong to a well body elevation adjusting section, the cast-in-place concrete section is not suitable to be less than 5CM high, concrete is not easy to pour when the cast-in-place concrete section is less than 5CM, the cast-in-place quality is not good to be guaranteed, the cast-in-place concrete section is not suitable to be more than 20CM, the cast-in-place concrete section can be assembled by using an adjusting pipe section of 20CM when the cast-in-place concrete section is larger than 20CM, and when the cast-in-place concrete section of the well body elevation adjusting section is overlarge, the shrinkage of the cast-in-place concrete after solidification can increase the accumulated error of the well elevation.

Furthermore, the length of the elevation adjusting block is less than 2CM of the wall thickness of the well pipe (the influence of formwork support and the influence of cast-in-place concrete integrity caused by exposure is avoided, but the length cannot be too small, and the installation stability is influenced). The concrete of the elevation adjusting block is in a fine grain form, and the grade is higher than the well pipe by at least one grade (not lower than C30), so that the stability and the strength of the whole structure are improved.

Furthermore, the elevation adjusting block comprises an adjusting block with an anti-falling net hook and an adjusting block without the anti-falling net hook.

The adjusting block with the anti-falling net hook is prefabricated in the anti-falling net hook (the hook firmness is enhanced, the field installation punching is reduced), the adjusting block without the anti-falling net hook is not provided with the anti-falling net hook, the height of the adjusting block with the anti-falling net hook is 5CM and 10CM, the adjusting block without the anti-falling net hook is prefabricated with high-grade (more than C30) mortar into adjusting cushion blocks with parts of 2CM and 3CM, concrete adjusting cushion blocks with parts of 5CM and 10CM are prefabricated with fine grain type concrete, and the elevation adjustment below 2CM can be adjusted to a millimeter level by adopting a steel plate; be convenient for adjust to the design height, the practicality is strong, and the accuracy is high.

Further, the roadbed design is that the strength of the filling material from the periphery of the filling well body to the position below the top of the well body is the same as that of the pavement base layer theoretically. The compactness of the periphery of the well is ensured to be the same as that of the roadbed of the pavement, so that the well cover and the flatness of the periphery of the road are the same after the road passes through, and the well cover can bear the impact of vehicles and the like.

Further, the filler is filled to the position 3-5CM below the periphery of the well body and the top of the well body; because the space to be filled is small, it is difficult to ensure that the compactness of the periphery of the well is the same as that of the roadbed, and the filling material convenient for construction is usually selected according to actual conditions for backfilling. C15 self-compacting fine-grained concrete or fluid fly ash is recommended. The filling material adopts C15 self-compacting fine grain type concrete, the strength is not too high, the fluidity is good, the self-compacting performance is good, a core sample can be taken out by drilling, and the filling material is economical and practical;

the fluid fly ash can be adopted in areas where the fly ash is convenient (low in price), the fluid fly ash is usually prepared by uniformly adding 3-4% (by weight of the fly ash) of cement into the fly ash, adding water to form a fluid shape, and then using the fluid fly ash as a filler for backfilling a small space.

Further, the external mold is arranged from the road surface base layer to a section 5CM below the top of the well cover seat, and self-compacting fine grain type concrete with the same level or one level higher than the well pipe is adopted for pouring concrete between the internal mold and the external mold, and C30 self-compacting fine grain type concrete is usually adopted; guarantee the steadiness and the compressive strength of well lid.

Further, the precision error of the well in the step 2) of measuring and positioning the center of the well bottom cover plate and after the construction is finished is controlled within 3CM, and the elevation precision error of the installation and positioning of the well cover seat is controlled within +/-3 mm; the construction accuracy is improved, and the construction quality is guaranteed.

Furthermore, a suspension cage and a ladder are arranged in the drilled well hole; the whole construction process of the dike-well only comprises the processes of taking out a bottom hole cover plate → clearing a bottom hole closing up → adding cement mortar, wherein the manual work is needed to be carried out to the bottom hole for assistance, although the roadbed is a compacted soil body, the subsequent process construction is needed to be organized immediately after the hole is formed by rotary drilling, the probability of soil body collapse is extremely low, the risk of soil body collapse is needed to be prevented, a suspension cage for resisting the soil body collapse is needed to be processed and put into the well hole, then a ladder is put into the well for personnel to go in and out, and the personnel are required to fast forward and fast out when entering the construction.

Furthermore, the inner mold (the arc outer diameter of the inner mold is the same as the inner diameter of the well pipe, and a steel plate with the thickness not less than 5MM is suitable) is processed into two groups of symmetrical arc-shaped modules, the inner mold is mainly used for cast-in-place concrete of a well elevation adjusting section (usually not more than 20CM long), and the modules are connected through an adjustable screw rod. The inner mould of the cast-in-place concrete well body elevation adjusting section between the well body and the well cover seat is easily made into two symmetrical groups of modules, each group of modules consists of two 1/4 circular arcs, the middle of each group of modules is connected by an adjustable screw rod so as to be convenient for disassembly and positioning, a semicircular limiting hole for preventing falling net hooks is reserved at the end of each circular arc template, the two groups of modules are mutually overlapped for not less than 1CM, the height of each group of modules is required to exceed the well body elevation adjusting section by 5CM in the vertical direction, and the full length size of 30CM height is preferably adopted so as to meet the use of various elevation adjusting sections; the inner die positioning and the elevation adjusting block with the hook are synchronously installed in place to improve the positioning effect.

Furthermore, the outer die is used for cast-in-situ concrete at the well elevation adjusting section and fixing the cast-in-situ concrete by the well cover seat, the inner diameter of the metal outer die is 10CM larger than the outer diameter of the well cover seat, a steel plate with the thickness not less than 3MM is suitable for being processed into a cylindrical integral steel die, the height of the outer die is obtained by subtracting the height of the pavement base layer from the installation height of the well cover seat and then subtracting 5CM from the height of the pavement base layer, and the outer die is arranged at a section from the pavement base layer to the position 5CM below the top of the well cover seat and is concentric with the well cover seat; the cast-in-place concrete outer mold of the standard section well filling (adopting C15 concrete or fluid fly ash) and well elevation adjusting section below the pavement base is a hole wall formed by drilling of a rotary drilling rig; pouring concrete between the inner mold and the outer mold of the corresponding elevation adjusting section by adopting self-compacting fine grain type concrete which is the same level or higher level than the well pipe, and usually adopting C30 self-compacting fine grain type concrete; guarantee the steadiness and the compressive strength of well lid.

The construction method of the first dike and the second dike is a new technology which is developed from the construction process to improve the traditional construction method, essentially ensures that the pipeline is not blocked by construction waste, improves the roadbed bearing capacity around the well, reduces the settlement amount of the well and the periphery, prolongs the service life of the well and the periphery road, improves the construction quality of the municipal well, improves the quality of the municipal road, reduces the maintenance frequency of the inspection well, saves the maintenance cost, improves the road construction and use safety, improves the driving comfort, improves the municipal engineering quality and the comprehensive economic benefit, reduces the driving noise, comprehensively reduces the construction and use cost, has a new technology with better social and economic values, and has better practicability and higher popularization and application values.

In the description of the present invention, it is to be understood that the terms "comprises" and "comprising," if any, are used in the sense of being interpreted as being based on the indicated orientation or positional relationship, rather than indicating or implying that the referenced device or element must have a particular orientation, configuration, or operation, and therefore the terms "comprising" and "comprising," if any, are used in an illustrative and non-limiting sense.

The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to encompass any design that is the same or similar to the present invention.

Claims

1. A construction method for diking before well is characterized in that: the method comprises the following steps:

4) Installing a well body at the bottom of a well, wherein the well body is formed by splicing and combining well pipes, measuring the elevation of the well body after the installation is finished, installing an elevation adjusting block at the upper end of the well body according to the measuring result, installing a well cover seat on the elevation adjusting block, installing an inner mold of a section needing to be cast in situ between the well body and the well cover seat, filling the periphery of the well body to the position below the top of the well body with a filling material, installing an outer mold of the section needing to be cast in situ between a pavement base layer and the section below the top of the well cover seat, pouring concrete between the inner mold and the outer mold, and installing the well cover on the well cover seat to finish the construction; a well body elevation adjusting section is arranged between the well body and the well cover seat; the outer diameter of the inner die is the same as the inner diameter of the well pipe, and the height of the inner die is 5CM higher than the elevation adjusting section of the well body in the vertical direction; the inner diameter of the outer mold is 10CM larger than the outer diameter of the well cover seat, and the outer mold is arranged on a section from the road surface base layer to the position 5CM below the top of the well cover seat and is concentric with the well cover seat.

2. The embankment-well-after-well construction method according to claim 1, wherein: and a plurality of hoisting holes are symmetrically formed in the well bottom cover plate and the well pipe.

3. The embankment-well-after-well construction method according to claim 2, wherein: before roadbed construction, the hoisting holes of the shaft bottom cover plate need to be covered.

4. The embankment-well-after-well construction method according to claim 1, wherein: the well pipe comprises a standard pipe section with a primary-secondary interface and an adjusting pipe section.

5. The embankment-well-after-well construction method according to claim 1, wherein: the thickness of the cast-in-place concrete section between the well body and the well cover seat is 5-20CM.

6. The embankment-well-after-well construction method according to claim 1, wherein: the length of the elevation adjusting block is less than 2CM of the wall thickness of the well pipe.

7. The embankment-well-after-well construction method according to claim 1, wherein: the elevation adjusting block comprises an adjusting block with an anti-falling net hook and an adjusting block without the anti-falling net hook.

8. The embankment-well-after-well construction method according to claim 1, wherein: the filling material adopts C15 self-compacting fine-grain concrete or fluid fly ash.

9. The embankment-well-after-well construction method according to claim 1, wherein: the internal mold consists of two symmetrical groups of modules, and the modules are connected through an adjustable screw rod.

10. The embankment-well-after-well construction method according to claim 1, wherein: a suspension cage and a ladder are arranged in the drilled well hole.