CN112267892B - Secondary pipe jacking construction operation method and system - Google Patents
Secondary pipe jacking construction operation method and system Download PDFInfo
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- CN112267892B CN112267892B CN202010889681.7A CN202010889681A CN112267892B CN 112267892 B CN112267892 B CN 112267892B CN 202010889681 A CN202010889681 A CN 202010889681A CN 112267892 B CN112267892 B CN 112267892B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/10—Making by using boring or cutting machines
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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Abstract
The invention provides a secondary pipe jacking construction operation method, which comprises the following steps: constructing a departure well according to a preset drawing, and erecting pipe jacking equipment at the bottom of the departure well; sequentially connecting the sections one by one along a preset direction and sequentially jacking one by one section of primary machine head, a plurality of sections of primary pipe sections, one section of secondary machine head and a plurality of sections of concrete pipes one by one, wherein the outer diameter of each primary pipe section is smaller than that of each concrete pipe; before the primary machine head reaches a preset position, carrying out construction of the receiving well at the preset position and synchronously completing the construction of the receiving well when the primary machine head reaches the preset position; sequentially receiving a section of primary machine head, a plurality of sections of primary pipe joints and a section of secondary machine head which are ejected into the receiving well in the receiving well; and stopping the operation of the pipe jacking equipment after the secondary machine head is received, and forming a plurality of sections of concrete pipes into a required underground pipeline. The secondary pipe jacking construction operation method has the advantages of convenience in construction, low cost and the like. In addition, the invention also provides a secondary pipe jacking construction operation system.
Description
Technical Field
The invention relates to the field of engineering construction, in particular to a secondary pipe jacking construction operation method and system.
Background
In recent years, various pipe jacking methods and machines are continuously rich and perfect, and slurry balance type, soil pressure balance type, traction pipe jacking, large shield pipe jacking and the like are adopted for pipe jacking methods aiming at different pipe diameters, geology, working conditions and requirements. Aiming at the characteristics of rich water, weak soil and dense surface buildings in the south, a top cover method with convenient construction, quick construction and low construction cost is needed.
Disclosure of Invention
The invention provides a secondary pipe jacking construction operation method and system, which are used for carrying out pipe jacking operation in a construction mode of sequentially connecting and jacking pipe jacking through pipe jacking with gradually increased wire diameters, have low requirements on construction equipment, simple construction structure, small requirements on the size of a construction well, and have good practical significance.
Correspondingly, the invention provides a secondary pipe jacking construction operation method, which comprises the following steps:
constructing a departure well according to a preset drawing, and erecting pipe jacking equipment at the bottom of the departure well;
sequentially connecting and jacking a section of primary machine head, a plurality of sections of primary pipe sections, a section of secondary machine head and a plurality of sections of concrete pipes section by section along a preset direction, wherein the outer diameter of the primary pipe sections is smaller than that of the concrete pipes;
before the primary machine head reaches a preset position, carrying out construction of a receiving well at the preset position, and synchronously completing the construction of the receiving well when the primary machine head reaches the preset position;
sequentially receiving the primary machine head, the primary pipe joints and the secondary machine head which are ejected into the receiving well in the receiving well;
and stopping the operation of the pipe jacking equipment after the secondary machine head is received, and forming the needed underground pipeline by the concrete pipes.
In an optional embodiment, based on the jacking direction of the primary head, the head wire diameter of the primary head is smaller than the tail wire diameter of the primary head, and the side surface of the primary head smoothly transits from the head to the tail;
the head wire diameter of the primary machine head is 150 mm, and the tail wire diameter of the primary machine head is 350 mm;
the line diameter of the primary pipe joint is 350 mm.
In an optional embodiment, based on the jacking direction of the primary nose, the head wire diameter of the secondary nose is smaller than the tail wire diameter of the secondary nose, and the side surface of the secondary nose smoothly transits from the head to the tail;
the line diameter of the head of the secondary machine head is 350 mm outside the line diameter of the tail of the secondary machine head, and the line diameter of the tail of the secondary machine head is 785 mm;
the outer diameter of the concrete pipe was 780 mm.
In an alternative embodiment, the receiving well is comprised of a fabricated wellbore.
An alternative embodiment, further comprising:
confirming setting positions of a receiving well and a departure well based on allowable construction time of the corresponding surface sites at two ends of the underground pipeline, taking one end of a smaller allowable construction time as the setting position of the departure well and taking one end of a larger allowable construction time as the setting position of the receiving well;
or confirming the setting positions of the receiving well and the departure well based on the earth surface site allowable construction radius corresponding to the two ends of the underground pipeline, taking one end of the smaller allowable construction radius as the setting position of the receiving well, and taking the single of the larger allowable construction radius as the setting position of the departure well.
An alternative embodiment, further comprising:
confirming the maximum outer diameter of the receiving well;
performing profile selection of the fabricated well bore based on the maximum outer diameter of the receiving well;
confirming a maximum section length based on the size of the fabricated wellbore;
and confirming the maximum lengths of the primary handpiece, the primary pipe section and the secondary handpiece based on the maximum standard length.
In an alternative embodiment, the selecting the fabricated wellbore based on the receiving well maximum outer diameter comprises:
screening the existing assembled shaft model selection table by taking the maximum outer diameter of the receiving well as the maximum value to obtain a plurality of assembled shaft models to be confirmed;
and confirming the wall thickness requirement of the assembled shaft according to the depth requirement of the receiving well and confirming one actually adopted assembled shaft model in the plurality of assembled shaft models to be confirmed based on the wall thickness requirement.
In an alternative embodiment, identifying a maximum joint length based on the size of the fabricated wellbore comprises:
confirming an allowable maximum side opening wire diameter of the fabricated well bore based on the fabricated well bore model;
a maximum section length is identified based on an outer diameter, an inner diameter, and the allowable maximum side opening wire diameter of the fabricated wellbore.
In an optional embodiment, sequentially receiving the primary handpiece, the primary pipe sections, and the secondary handpiece ejected into the receiving well in the receiving well includes:
and receiving the primary machine head, the primary pipe joints and the secondary machine head from the receiving well based on a hoisting mode, wherein the hoisting position of any one of the primary machine head, the primary pipe joints and the secondary machine head is a position which is one third of the length of the head of the machine head.
Correspondingly, the secondary pipe jacking construction operation system provided by the invention is used for realizing the secondary pipe jacking construction operation method.
The secondary pipe jacking construction method and system provided by the invention combine the advantages of the secondary pipe jacking construction method and the prefabricated assembled shaft, fully utilize the advantages of adjustable length of the secondary pipe jacking guide pipe and small jacking pressure requirement in the pipe jacking construction of the stratum which is easy to soften when meeting water in dense urban buildings, heavy traffic and underground water, take the assembled shaft as a receiving well, replace the traditional receiving well construction process, reduce the influence of pipe jacking well construction on traffic and environment, reduce comprehensive construction cost and create good social benefit and economic benefit in a flexible and convenient mode.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a secondary pipe jacking construction operation method according to an embodiment of the invention;
fig. 2 is a schematic diagram of a process of a secondary pipe jacking construction operation according to an embodiment of the present invention;
FIG. 3 is a schematic illustration of a section of an assembled wellbore according to an embodiment of the present disclosure;
FIG. 4 is a schematic cross-sectional view of an assembled wellbore according to an embodiment of the invention;
fig. 5 is a flow chart of a reverse construction method.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Fig. 1 shows a flow chart of a secondary pipe jacking construction operation method according to an embodiment of the invention.
The embodiment of the invention provides a secondary pipe jacking construction operation method, which comprises the following steps of:
s101: constructing a departure well according to a preset drawing, and erecting pipe jacking equipment at the bottom of the departure well;
specifically, the departure well is constructed based on the reverse construction method (or referring to other prior art), and pipe jacking equipment and corresponding matched equipment are arranged at the bottom of the well after the construction is completed, and the step can be performed by referring to the existing construction mode.
S102: sequentially connecting and jacking a section of primary machine head, a plurality of sections of primary pipe sections, a section of secondary machine head and a plurality of sections of concrete pipes section by section along a preset direction, wherein the outer diameter of the primary pipe sections is smaller than that of the concrete pipes;
fig. 2 shows a schematic operation structure of a secondary pipe jacking construction operation method according to an embodiment of the invention. Specifically, a section of the primary machine head, a primary pipe section and a secondary machine head are denoted by a section of the whole body.
Specifically, the primary pipe joint with smaller size is firstly used for ejecting soil, then the channel excavated by the primary pipe joint is expanded through the secondary machine head, so that the line diameter of the channel is enlarged, and then the underground pipeline formed by splicing a plurality of concrete pipes is ejected into the expanded channel, so that the laying of the underground pipeline is completed.
Specifically, the front end of the primary pipe joint needs to be connected with a primary machine head with a thick head and a thin tail so as to reduce jacking resistance; similarly, a transition is required between the primary pipe joint and the concrete pipe (underground pipeline) through a secondary machine head.
Specifically, in the embodiment of the invention, the primary machine head is in a conical structure, the head wire diameter of the primary machine head is smaller than the tail wire diameter of the primary machine head by taking the jacking direction of the primary machine head as a reference, and the side surface of the primary machine head is in smooth transition from the head to the tail; the head wire diameter of the primary machine head is 150 mm, the tail wire diameter of the primary machine head is 350 mm, and the length of the primary machine head is 1000mm. In particular, limitations regarding length are described later.
After the primary machine head is jacked in, the tail end of the primary machine head is in socket connection with (connected with) the primary pipe joint, and in the embodiment of the invention, the wire diameter of the primary pipe joint is kept the same as the wire diameter of the tail end of the primary machine head, and the length of the primary pipe joint is 1500mm.
Correspondingly, taking the jacking direction of the primary machine head as a reference, the head wire diameter of the secondary machine head is smaller than the tail wire diameter of the secondary machine head, and the side surface of the secondary machine head is in smooth transition from the head to the tail; the line diameter of the head of the secondary machine head is 350 mm outside the line diameter of the tail of the secondary machine head, and the line diameter of the tail of the secondary machine head is 785 mm; the outer diameter of the concrete pipe was 780 mm.
In the concrete implementation, after equipment is installed in place, paying off is carried out among wells, the elevation of the bottom of a pipe is rechecked, and the theodolite measures orientation, a jack starts to operate, and each section of standard section is continuously jacked in; after the standard joint connection is completed each time, the theodolite observes the position change of the arrow indicator lamp between jacking, and timely adjusts the jacking force to ensure the accuracy of the axial direction. When the top force is changed, the measurement is needed to be carried out in time, and the correction is carried out. The operation is continued until all the segments reach the receiving well and are sequentially taken out from the receiving well.
S103: before the primary machine head reaches a preset position, carrying out construction of a receiving well at the preset position, and synchronously completing the construction of the receiving well when the primary machine head reaches the preset position;
in order to save the construction occupation time of the receiving well as much as possible, the receiving well and the departure well are constructed in an unsynchronized construction mode, specifically, the construction of the receiving well is performed at a preset position before the primary machine head reaches the preset position and the construction of the receiving well is synchronously completed when the primary machine head reaches the preset position according to the actual action (the primary machine head, the primary pipe joint and the secondary machine head) of the receiving well. It should be noted that the synchronous completion refers to the optimal completion time of the receiving well according to the construction period, and generally, the completion time of the receiving well can be slightly earlier than the time of the primary machine head reaching the preset position, so as to ensure that the primary machine head can perform the ejection operation without waiting for a longer time, and avoid the difficulty of the jacking operation caused by the rapid increase of the top pressure of the pipeline due to the longer downtime.
S104: sequentially receiving the primary machine head, the primary pipe joints and the secondary machine head which are ejected into the receiving well in the receiving well;
after the completion of the receiving well construction, the standard joint is received from the receiving well section by section.
S105: and stopping the operation of the pipe jacking equipment after the secondary machine head is received, and forming the needed underground pipeline by the concrete pipes.
The underground pipeline is a required pipeline formed by a plurality of concrete pipes.
It should be noted that, in the foregoing description, the details of the specific embodiments are not described in detail with reference to the prior art, and the embodiments of the present invention are not limited and described in any way.
Specifically, in addition to the steps actually performed by the construction, the embodiment of the invention also provides contents related to part of the design process.
Specifically, the receiving well of the embodiments of the present invention is comprised of an assembled wellbore. Specifically, the prefabricated reinforced concrete shaft can be adopted as the assembled shaft, the prefabricated reinforced concrete shaft replaces the traditional on-site masonry or on-site pouring mode in an on-site assembly mode, and parameters such as the size, the appearance, the assembly height, the material admixture and the like of the well can be reasonably and accurately selected according to geographic environment, engineering conditions and design requirements to carry out industrial production. Has the advantages of high strength, stable quality, shortened construction period, improved efficiency, environmental protection and the like. The factory production generally adopts the processes of cantilever vibration and core vibration, the reinforced concrete molding realizes high compactness and high strength, and the quality is stable and reliable through factory concrete maintenance. When the urban construction is dense, the traffic is busy and the burial depth is below the groundwater level, the assembled shaft is used as the receiving well to replace the traditional receiving well construction process, so that the influence of the receiving well construction on traffic and environment is reduced, and the cost is reduced. And manufacturing receiving well joint guide joints by using assembled shafts with corresponding diameters, and sequentially jacking subsequent concrete pipes. The receiving well is replaced by the assembled shaft, so that the construction process of the open caisson or the reverse construction method well body is saved, and good social benefit and economic benefit are created in a flexible and convenient mode.
Furthermore, before the secondary pipe jacking construction operation, the most basic known data are the positions of two ends of the pipeline to be paved, the specific known data also relate to the data such as the buried pipe depth of the pipeline, and the step only needs to set the positions of the earth surface corresponding to the two ends of the pipeline temporarily.
Specifically, the receiving well in the embodiment of the invention is made of the assembled shaft, and has the characteristics of short construction period and small enclosing space required by construction, so that corresponding receiving well and departure well setting positions are required to be confirmed according to actual conditions of the surface positions corresponding to the two ends of the pipeline.
Specifically, the embodiment of the invention provides two methods for confirming the setting positions of a receiving well and a departure well:
the first mode is to confirm the setting positions of a receiving well and a departure well based on the allowable construction time of the corresponding surface sites at the two ends of the underground pipeline, take one end of the smaller allowable construction time as the setting position of the departure well, and take one end of the larger allowable construction time as the setting position of the receiving well; specifically, this step mode uses allowable construction time of the site at both ends of the pipeline to be laid as an evaluation criterion to determine the setting positions of the receiving well and the departure well. Specifically, the content indicated by the allowable construction time may be the maximum allowable construction time that can be applied in the field approval, or may be confirmed according to the actual field situation, for example, the allowable construction time of the person with larger economic or traffic influence in the enclosing time is relatively shorter by comparing the field live conditions at the two ends of the pipeline. Through the evaluation standard, the economic or traffic influence on the field in the whole pipe jacking engineering can be reduced to the minimum.
The second mode is to confirm the setting positions of the receiving well and the departure well based on the allowable construction radius of the ground surface sites corresponding to the two ends of the underground pipeline, take one end of the smaller allowable construction radius as the setting position of the receiving well, and take the single one of the larger allowable construction radius as the setting position of the departure well.
In particular, this approach allows the construction radius to be an evaluation criterion with respect to the location of the two ends of the pipeline to be laid to determine the location of the receiver well and the departure well. Specifically, the assembled shaft has the characteristic of small occupied space as a receiving well, and the site with larger allowable construction radius is used as the setting position of the departure well, so that the construction size of the departure well can be as large as possible, more abundant working space is provided, and the operation is facilitated.
After confirming the installation positions of the receiving well and the departure well by one of the above methods, calculation of the main dimensions of the structure involved in the secondary pipe jacking operation is started.
Basically, the maximum outer diameter of the receiving well needs to be confirmed;
firstly, the outer diameter of the underground pipeline to be laid is smaller (780 mm) in the secondary pipe jacking construction process; therefore, after the pipeline is excavated through the primary pipe joint, the jacking of the concrete pipe can be carried out only by connecting one secondary machine head. In specific implementation, for the ground environment (high jacking pressure) with larger outer diameter or harder soil of the underground pipeline, multiple progressive pipe joints (secondary pipe joints, tertiary pipe joints and the like) with different diameters are required to be arranged at the rear section of the secondary machine head, and corresponding machine heads (tertiary machine heads, quaternary machine heads and the like) are used for assisting in pipe joint diameter changing connectors. Specifically, the line diameter of the specific standard section is determined by the pipe jacking pressure of the pipe jacking equipment, and the pipe jacking line diameter of each stage of pipe section is uniformly distributed in the pipe jacking pressure interval of the pipe jacking equipment so as to utilize the pipe jacking equipment with maximum efficiency.
In a specific implementation, in order to take out the jacking pipe from the receiving well, the receiving well (the assembled shaft) has a certain inner diameter requirement, and in a subsequent step, the size limitation relation which can be derived partially through the practical construction condition is not further described in the embodiment of the invention, and the limitation is carried out according to the practical condition.
Specifically, the confirmation of the maximum outer diameter of the receiving well is mainly related to the size range of the setting site of the receiving well, and the receiving well can be as large as possible within the allowable range so as to reduce the connection quantity of the jacking pipes and accelerate the construction process; meanwhile, the increase of the size of the receiving well is beneficial to reducing the construction difficulty.
Specifically, the selection of the fabricated wellbore is required based on the maximum outer diameter of the receiving well;
in specific implementation, an ideal assembled shaft can be obtained in a customized mode, but the period of customized products is long, the cost is high, and the implementation of engineering is not facilitated. Thus, the selection is typically made in existing fabricated wellbores (models).
Specifically, screening the existing assembled shaft model selection table by taking the maximum outer diameter of the receiving well as the maximum value to obtain a plurality of assembled shaft models to be confirmed; and confirming the wall thickness requirement of the assembled shaft according to the depth requirement of the receiving well and confirming one actually adopted assembled shaft model in the plurality of assembled shaft models to be confirmed based on the wall thickness requirement.
In order to increase the working space of the receiving well as much as possible, the step firstly performs preliminary screening on the outer diameter of the assembled shaft through the maximum outer diameter of the receiving well, then confirms the minimum wall thickness (ensuring the pressure endurance) required by the assembled shaft according to the depth requirement (which can be understood as the buried pipe depth of a pipeline) of the assembled shaft, and performs further screening on the condition of the minimum wall thickness so as to select the assembled shaft (model) with the maximum inner diameter.
After the model selection confirmation is carried out on the assembled shaft for constructing the receiving well through the supplement, the basic structure of the receiving well is determined, and the objects of the receiving well which are cited later are all the receiving wells formed by the assembled shaft.
Further, a maximum section length is identified based on the size of the fabricated wellbore.
Specifically, the shaft formed by the assembled shaft has inherent inner diameter dimension and outer diameter dimension, and conventionally, the inner diameter dimension of the assembled shaft can be directly utilized as the maximum standard section length; in an embodiment of the present invention, the outer diameter R and the inner diameter R of the fabricated wellbore 101 have been determined by the choice of the fabricated wellbore, with reference to the schematic structural diagram of a section of the fabricated wellbore shown in fig. 4 of the drawings. In practice, because the receiving well needs to receive the top pipe from the side, the fabricated well bore needs to be opened at the side to form the receiving port 102; in the embodiment of the present invention, it is assumed that the wire diameter of the receiving port 102 is D.
Basically, the wire diameter of the receiving opening 102 needs to be larger than the size of the standard knot with the maximum wire diameter so that the standard knot can pass through and lift the standard knot for receiving; in one aspect, due to the presence of the receiving port 102, the length of the section receivable at the receiving port is longer than the inner diameter of the fabricated wellbore; on the other hand, during lifting of the section, since the section is tiltably lifted, even completely vertically, the maximum section length of the section is not actually directly dependent on the inside diameter of the assembled well bore, but on the spatial position limitation of the section during the switching of the section to the lifted state in a state coaxial with the receiving opening, in which process the required maximum assembled well bore size is the factor determining the maximum section length of the top pipe. In other words, when the basic structure of the fabricated wellbore has been determined, the maximum section length of the section of the fabricated wellbore that is permissible to perform the lifting operation, which is not equal to the inside diameter of the fabricated wellbore, can be theoretically determined by correlation calculation of the data of the fabricated wellbore.
Basically, confirming the allowable maximum side opening line diameter of the fabricated well bore based on the fabricated well bore model;
a maximum section length is identified based on an outer diameter, an inner diameter, and the allowable maximum side opening wire diameter of the fabricated wellbore.
Specifically, the receiving port 102 may be obtained directly during the molding of the assembled shaft mold, or may be cut at a construction site, and in order to ensure the structural strength requirement of the assembled shaft, the maximum line diameter D of the receiving port 102 is typically 30% of the inner diameter of the assembled shaft or 30% of the height of the assembled shaft.
Referring to the schematic cross-sectional view of the fabricated well bore shown in fig. 5 of the drawings, in an embodiment of the present invention, the maximum length of the standard section that can be passed through the fabricated well bore is calculated according to the following method:
with reference to the attached drawings, the outer diameter of the assembled shaft is R, the inner diameter of the assembled shaft is R, the wall thickness of the assembled shaft is R-R, the maximum length of the standard joint is L0, the maximum outer diameter of the standard joint is D (generally equal to or slightly larger than the outer diameter of a pipeline to be paved), and the line diameter of the receiving port is D (taking a value with a theoretical maximum value).
The theoretical evaluation formula with the maximum standard knot length L0 of the jacking pipe is as follows:
taking the point A1 as a theoretical swing center:
taking the point A2 as a theoretical swing center:
specifically, the theoretical swing center is assumed that the standard node is completely ideal to swing around the theoretical swing center without changing the swing center when in lifting operation, and the whole swing is actually moved to the left side in the direction of illustration, but the step is only theoretical calculation, and the maximum standard node length obtained by the calculation method according to the step is smaller than the allowable maximum standard node length in actual implementation, so that the effective lifting operation can be ensured, and the condition of no operation can be caused.
Specifically, the lifting operation is started when the beginning of the section contacts the inner wall of the fabricated wellbore.
Specifically, in order for the end of the joint to pass through the receiving hole smoothly when swinging, the size from the point A1 (the receiving hole is at the center point of the inner wall of the assembled wellbore) to the end of the joint needs to be limited; when the point A1 is taken as the theoretical swing center, the maximum radius of the standard node is the distance between the point A1 and the peak at the tail end of the standard node in the cross section shown in fig. 4 during the swing, and the maximum allowable size of the receiving hole is the distance between the point A1 and the wall of the receiving hole (i.e.
) According to Pythagorean theorem, the distance from the point A1 to the tail end of the standard knot can be obtained by taking the distance from the point A1 to the wall of the receiving hole as the radius of the maximum radius occurrence position, wherein the maximum allowable passing size of the receiving hole is the distance from the point A1 to the wall of the receiving hole>
Thus, the maximum burl length of the burls is
Similarly, when the point A2 (the center point of the receiving hole on the outer wall of the assembled shaft) is taken as the theoretical swing center, the maximum length of the standard section is
In particular, the reason for taking the radius of the receiving hole as the maximum allowable passing dimension is that, in combination with the specific situation of implementation, when the section does not extend completely into the assembled shaft, the part thereof located outside the assembled shaft is still in the soil layer; in the swinging process of the lifting operation, soil is required to be dug out (in a swinging mode), if the distance from the theoretical swinging center to the tail part of the standard knot is too large, the soil can be pressed to the periphery of a receiving hole (the outer wall of an assembled shaft) when the standard knot from the theoretical swinging center to the tail part of the standard knot swings in the lifting operation, the soil can be compacted and the standard knot is blocked, and the distance from the theoretical swinging center to the tail part of the standard knot is not too long for the smooth execution of the swinging process of the lifting operation.
Further, confirming the number of stages of the standard section and the outer diameter of each stage of standard section based on the outer diameter of the target pipeline, and selecting the standard section according to the maximum standard section length;
in the above steps, after the maximum length of the standard knot is obtained through theoretical calculation, the standard knot can be selected according to the maximum length of the standard knot.
Specifically, for the construction mode of the departure well, the construction process of the reverse construction method refers to a reverse construction method flow chart shown in fig. 6 of the accompanying drawings.
Specifically, assume that the excavation depth of a departure well is 4-5.5 m, and the clearance of the inner side is phi 3.5m; the wall thickness of the arch wall is 350-500 mm, the concrete grade of the arch wall is C30, the steel bars adopt phi 16 steel bars, and the overlap joint length of the horizontal stirrups and the steel bars of the upper arch wall and the lower arch wall is not less than 46d.
The earth excavation mainly adopts mechanical excavation, and the parts which cannot be directly excavated by the machinery adopt manual excavation, cleaning and piling; the earthwork which cannot be directly transported by the excavator is transported outside by loading after the earth is lifted to the ground to be piled up by adopting the crane; the excavation depth of each layer is not more than 1m, and the next layer of earth excavation can be carried out after the concrete strength of the upper layer of arch wall reaches 70% of the design strength.
The allowable deviation of the size of the departure well is not more than 30mm, the center position and the aperture of a hole are inspected according to the marked pile center cross line hanging wire, and then the well wall steel bar binding, the supporting and shaping steel template and the concrete pouring are carried out, so that the cyclic operation is carried out to the depth required by the design. In order to ensure the verticality of the pile, checking the center position and the verticality of the pile once every three sections of well walls of the poured column.
The local backfill soil and the mucky soil layer or the groundwater are bigger in construction, collapse, sand flow and other phenomena occur, the well wall section height is properly reduced to 300-500 mm, and special protection measures such as sand blocking bags, straw, wall protection concrete thickening, reinforcing steel bar encryption and other reinforcement measures are adopted before the formwork is supported. Meanwhile, a temporary water collecting pit is dug at one side of the pit bottom, pumping water is added to prevent collapse from increasing, soil is dug after reinforcement treatment, and the collapsed holes are filled with concrete while pouring and tamping wall protecting concrete.
The wall protection steel bar reinforcement of the departure well is that the height of each section of the wall protection is not more than one meter, the blanking of the vertical steel bar is lengthened by 500mm, the vertical steel bar is overlapped with the next layer, and after acceptance inspection is qualified, the formwork is supported for pouring concrete.
In the well wall template supporting process, a processed shaping steel template is adopted, the template is assembled according to the well diameter in a blocking way, the template is connected and fixed by a U-shaped fastener, a short steel bar is arranged along the bottom of the template for reinforcement, and a seam is reserved in the assembly to clamp a phi 48 steel pipe so as to facilitate the removal of the template; if necessary, adopting phi 48 steel pipes to strengthen the opposite support.
And C30, casting the well wall concrete, and adding an early strength agent. The concrete is delivered downwards by using a bucket, a round protection plate is used as a distributing table, the symmetric pouring is performed, the side movement of the template is prevented, the concrete is tamped by a person, and the layering thickness of each time is 100-200 mm, so that the leakage of tamping is prevented.
And after the first section of well wall concrete is removed, the center line and the elevation are released.
In the template dismantling process, the support can be dismantled only when the strength of the wall concrete reaches 70%, and the steel pipe is dismantled firstly and then the template is pried when the template is dismantled; the detached templates should be cleaned in time and the deformed templates trimmed in time.
It is to be noted that the drainage open channels are arranged on the ground around the foundation pit before the foundation pit is excavated, meanwhile, the water collecting well is arranged, and the surface water is discharged to the underground pipeline after sedimentation. Draining water in the pit, arranging a water collecting pit at the bottom of the well, and pumping water in time so as to avoid soaking the bottom of the well.
Before jacking construction, construction electricity, water, channels, drainage, illumination and other equipment are installed according to requirements. And each power generation unit/sleeve for construction adopts 150 KW. The water is required to be hauled from outside, and the simple convenient lane for the field is required to be repaired, so that the field convenience of construction pipe materials, equipment and tools is ensured.
Specifically, the placing space of the jacking pipe needs to be reserved, for example, the placing space of DN600 pipe field equipment needs to be at least a flat closed field area with the length of 12 meters and the width of 8 meters. Corresponding construction materials, equipment and machines are required to be provided in order to meet the construction requirements of the engineering; the equipment such as jacking pipes needs to have enough reserved allowance.
And (3) preparing on the departure well, wherein a measurement control network is required to be established, and displacement and settlement monitoring is carried out on the departure well.
In the preparation work under the departure pit, equipment Wi e needing to be arranged is mainly related matched equipment required by push bench such as a back rest, a guide rail, a main top oil cylinder, an oil pump power station, a steel staircase and the like. The pipe jacking base is a steel structure prefabricated component, the position of the pipe jacking base accurately performs lofting according to the design axis of the pipeline, and the pipe jacking base is hung into the underground to be in place, installed and fixed according to a baseline for measuring lofting during installation. The guide rail on the base is arranged in the middle according to the design axis of the jacking pipe and the center of the actually measured portal and is provided with a support for reinforcement, so that the base is ensured to be stable and not deformed.
And finally, the pipe jacking machine is installed.
Specifically, the secondary pipe jacking construction operation method adopts an extrusion soil discharge mode, is applicable to dry and weak soil areas, does not need to discharge slurry, does not need grouting to reduce drag under the condition that the jacking force meets the calculation requirement, and does not change the characteristics of underground original soil. Specifically, referring to the schematic working process shown in fig. 2 of the accompanying drawings, the secondary pipe jacking construction starts to jack up and excavate the channel from the secondary pipe jacking, each stage of pipe jacking is sequentially connected in the departure well according to the sequence of gradually increasing line diameter and synchronously jacks up in a preset direction through the pipe jacking machine until the channel size is consistent with the pipeline to be paved, and finally the target pipeline is jacked up into the channel to finish pipe jacking operation.
The assembled shaft is used as a receiving well, and before the primary jacking pipe arrives, the installation and the back cover construction are finished, and the jacking pipe equipment is waited for recovery. And the construction schedule is reasonably arranged, the first-stage pipe jacking arrival time is used as a node inverted receiving well construction schedule, the construction period of the receiving well is effectively shortened, and the interference to traffic and environment is reduced to the maximum extent.
Specifically, construction project at receiving well one side is assembled pit shaft installation, back cover, receives secondary push pipe equipment (in the receiving well is hung from the receiving well after dismantling each level push pipe, and is optional, the hoist and mount position of push pipe is apart from the position of push pipe head one third push pipe length), the inspection shaft preparation, and specific construction flow is: construction preparation, foundation pit excavation, bottom plate construction, well room hoisting and splicing, perforating, pipe jacking equipment recovery, sediment cleaning, launder construction, cover plate hoisting, regulating block installation, well cover installation, backfilling and acceptance inspection.
The construction main points that relate to include:
and (3) measuring and paying off: and (5) paying off the well site center by using the total station, and carrying out elevation measurement and rechecking by using the level gauge.
Foundation pit excavation: and excavating a pipe foundation pit, wherein the elevation is controlled in the excavating process.
And (3) constructing a base plate: and (3) carrying out substrate treatment, wherein the characteristic value of the bearing capacity of the foundation meets the design requirement. And the cushion layer and the bottom plate pay attention to control the height and the plane position, and concrete pouring is carried out after the supporting die and the binding steel bars are well carried out.
Hoisting and splicing a shaft: and hoisting after the strength of the bottom plate concrete reaches 70%. The prefabricated shaft is hoisted by a 16T automobile crane, all the adjusting spliced blocks are connected by rabbets in the vertical direction, and the prefabricated shaft is sealed by 1:2 waterproof cement mortar. When the well chamber is installed, the well chamber is vertical, and the reserved port axis of the well chamber is matched with the axis of the pipeline.
Drilling a well wall: after the center of the hole site is released, the artificial gun machine chisels the well wall, and holes are formed.
And (3) recovering the pipe jacking equipment from the well: and after the pipe jacking equipment arrives, the pipe jacking equipment is disassembled in sequence and lifted out, and the cleaning and transferring are performed.
And (3) launder construction: adopting M10 cement mortar to build MU10 fly ash bricks, and adopting the thickness of 20mm to 1 on the surface of a launder: 2, the waterproof mortar is layered and plastered, and the plaster is compacted, flat and straight.
And (3) cover plate installation: and after the launder is constructed, the cover plate of the well chamber can be hoisted, slurry is firstly settled during hoisting, and the cover plate level is regulated and controlled.
Regulating block and well lid: and the adjusting block and the well cover are installed according to the ground height. The wellhead on the road surface adopts the reverse method. And (3) backfilling the well chamber to the elevation of the roadbed, and then performing base layer construction, wherein the well hole is covered by a2 cm thick steel plate, and the steel plate is leveled with the roadbed. After rolling and forming, pouring a cushion layer and a surface layer, and grooving and napping the surface after pouring.
Backfilling a well chamber: after the mortar strength reaches 70%, the inspection well Zhou Huitian can be carried out, and the backfill compactness meets the related requirements. The well Zhou Fenceng is backfilled, and the fillers on two sides are tamped during backfilling, so that the joint of the pipeline is prevented from being extruded, and the joint is symmetrically filled along the pipeline as much as possible, so that the compactness is ensured to meet the design and specification requirements.
In conclusion, the secondary pipe jacking construction method is a pipe jacking method suitable for water-rich soft soil, and is particularly suitable for small-pipe-diameter (DN 800 pipe diameter or below) pipeline construction by adopting an extrusion soil-discharging mode. Because of the way of extruding out soil, the equipment, the guide rail and the like are smaller than those of the balanced equipment; correspondingly, the departure well has small scale and high implementation convenience. In the secondary pipe jacking construction operation process, the pipe jacking does not change the property of soil around the pipeline in the jacking process, the stability of original soil is well maintained, grouting drag reduction is carried out only when the resistance is overlarge, and the pollution to the environment is reduced. For the reasons, the cost of the secondary pipe jacking construction operation method is obviously reduced compared with that of the muddy water balanced pipe jacking construction operation method. The prefabricated assembled shaft (a common reinforced concrete structure) is a shaft construction method which replaces the traditional on-site masonry or on-site pouring mode by an on-site assembled assembly mode, parameters such as the size, the appearance, the assembly height, the material admixture and the like of the shaft can be reasonably and accurately selected according to geographic environment, engineering conditions and design requirements, industrial production is carried out, and the prefabricated assembled shaft has the advantages of high strength, stable quality, shortened construction period, improved efficiency, environmental protection and the like, and is stable and reliable in quality.
The secondary pipe jacking construction operation method provided by the embodiment of the invention combines the advantages of the secondary pipe jacking construction operation method and the prefabricated assembled shaft, fully utilizes the advantages of adjustable length of the secondary pipe jacking guide pipe and small jacking pressure requirement in the pipe jacking construction of the stratum which is easy to soften when meeting water in dense urban buildings, heavy traffic and underground water, takes the assembled shaft as a receiving well, replaces the traditional receiving well construction process, reduces the influence of pipe jacking well construction on traffic and environment, reduces comprehensive construction cost, and creates good social benefit and economic benefit in a flexible and convenient mode.
Correspondingly, the invention also provides a secondary pipe jacking construction operation system which is used for realizing the secondary pipe jacking construction operation method.
The above describes in detail a secondary pipe jacking construction operation method and system provided by the embodiment of the present invention, and specific examples are applied to describe the principle and implementation of the present invention, and the description of the above examples is only used to help understand the method and core idea of the present invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
Claims (7)
1. The secondary pipe jacking construction operation method is characterized by comprising the following steps of:
constructing a departure well according to a preset drawing, and erecting pipe jacking equipment at the bottom of the departure well;
sequentially connecting and jacking a section of primary machine head, a plurality of sections of primary pipe sections, a section of secondary machine head and a plurality of sections of concrete pipes section by section along a preset direction, wherein the outer diameter of the primary pipe sections is smaller than that of the concrete pipes;
before the primary machine head reaches a preset position, carrying out construction of a receiving well at the preset position, and synchronously completing the construction of the receiving well when the primary machine head reaches the preset position;
sequentially receiving the primary machine head, the primary pipe joints and the secondary machine head which are ejected into the receiving well in the receiving well;
stopping the operation of the pipe jacking equipment after the secondary machine head is received, and forming a required underground pipeline by the concrete pipes;
the receiving well consists of an assembled shaft;
confirming setting positions of a receiving well and a departure well based on allowable construction time of the corresponding surface sites at two ends of the underground pipeline, taking one end of a smaller allowable construction time as the setting position of the departure well and taking one end of a larger allowable construction time as the setting position of the receiving well;
or confirming the setting positions of a receiving well and a departure well based on the allowable construction radius of the surface field corresponding to the two ends of the underground pipeline, taking one end of the smaller allowable construction radius as the setting position of the receiving well, and taking the single of the larger allowable construction radius as the setting position of the departure well;
confirming the maximum outer diameter of the receiving well;
performing profile selection of the fabricated well bore based on the maximum outer diameter of the receiving well;
confirming a maximum section length based on the size of the fabricated wellbore;
confirming a maximum length of the primary handpiece, the primary pipe section, and the secondary handpiece based on the maximum nominal length;
the maximum standard length theoretical estimation formula is as follows:
taking the point A1 as a theoretical swing center:
taking the point A2 as a theoretical swing center:
wherein: r is the outer diameter of the assembled shaft, R is the inner diameter of the assembled shaft, L0 is the length of the maximum standard knot, D is the maximum outer diameter of the standard knot, D is the line diameter of the receiving opening, A1 is the center point of the receiving opening on the inner wall of the assembled shaft, and A2 is the center point of the receiving opening on the outer wall of the assembled shaft.
2. The secondary pipe jacking construction operation method according to claim 1, wherein the head wire diameter of the primary machine head is smaller than the tail wire diameter of the primary machine head based on the jacking direction of the primary machine head, and the side surface of the primary machine head is smoothly transited from the head to the tail;
the head wire diameter of the primary machine head is 150 mm, and the tail wire diameter of the primary machine head is 350 mm;
the line diameter of the primary pipe joint is 350 mm.
3. The secondary pipe jacking construction operation method according to claim 2, wherein the head wire diameter of the secondary machine head is smaller than the tail wire diameter of the secondary machine head based on the jacking direction of the primary machine head, and the side surface of the secondary machine head is smoothly transited from the head to the tail;
the line diameter of the head of the secondary machine head is 350 mm outside the line diameter of the tail of the secondary machine head, and the line diameter of the tail of the secondary machine head is 785 mm;
the outer diameter of the concrete pipe was 780 mm.
4. The method of secondary pipe jacking construction work of claim 1, wherein the selecting of the fabricated wellbore based on the receiving well maximum outer diameter includes:
screening the existing assembled shaft model selection table by taking the maximum outer diameter of the receiving well as the maximum value to obtain a plurality of assembled shaft models to be confirmed;
and confirming the wall thickness requirement of the assembled shaft according to the depth requirement of the receiving well and confirming one actually adopted assembled shaft model in the plurality of assembled shaft models to be confirmed based on the wall thickness requirement.
5. The secondary pipe jacking construction work method of claim 1, wherein identifying the maximum standard length based on the size of said fabricated wellbore includes:
confirming an allowable maximum side opening wire diameter of the fabricated well bore based on the fabricated well bore model;
a maximum section length is identified based on an outer diameter, an inner diameter, and the allowable maximum side opening wire diameter of the fabricated wellbore.
6. The secondary pipe jacking construction work method of claim 1, wherein sequentially receiving said one-section primary head, a plurality of one-section primary pipe sections, and one-section secondary head ejected into said receiving well in said receiving well comprises:
and receiving the primary machine head, the primary pipe joints and the secondary machine head from the receiving well based on a hoisting mode, wherein the hoisting position of any one of the primary machine head, the primary pipe joints and the secondary machine head is a position which is one third of the length of the head of the machine head.
7. A secondary pipe jacking construction operation system, characterized by being used for realizing the secondary pipe jacking construction operation method according to any one of claims 1 to 6.
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| CN102155025B (en) * | 2011-03-23 | 2012-05-23 | 东南大学 | Late poured band type assembled pipe jacking working open caisson |
| CN206693363U (en) * | 2017-04-20 | 2017-12-01 | 广东中科华冉智网科技有限公司 | Assembled plastics municipal drainage inspection shaft |
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| CN108916469A (en) * | 2018-07-19 | 2018-11-30 | 深圳市工勘岩土集团有限公司 | The construction method that small-bore pipeline is worked continuously |
| CN109827006A (en) * | 2019-01-22 | 2019-05-31 | 广东水电二局股份有限公司 | A kind of construction method of non-horizontal push pipe |
| CN210797642U (en) * | 2019-07-30 | 2020-06-19 | 浙江交通职业技术学院 | A quick-assembled reinforced concrete inspection well |
| CN111236390A (en) * | 2020-01-19 | 2020-06-05 | 中建四局安装工程有限公司 | Push pipe trenchless construction method |
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