CN109797776B - Construction method for underground pipe gallery to meet cross pipeline based on open cut method - Google Patents
Construction method for underground pipe gallery to meet cross pipeline based on open cut method Download PDFInfo
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- CN109797776B CN109797776B CN201910023802.7A CN201910023802A CN109797776B CN 109797776 B CN109797776 B CN 109797776B CN 201910023802 A CN201910023802 A CN 201910023802A CN 109797776 B CN109797776 B CN 109797776B
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Abstract
Firstly, carrying out supporting construction on a pipe gallery section foundation pit without a cross pipeline section, after the construction is finished, moving an adjacent original cross pipeline to a finished foundation pit supporting section, when the cross pipeline is laid in a shifting way, positioning and protecting steel wire ropes are embedded along a pipe body in the range of the foundation pit, temporarily not implementing a concrete base, dismantling the old cross pipeline, and continuing to carry out supporting construction on the pipe gallery foundation pit until the whole construction is finished; before the excavation is accomplished in piping lane excavation supporting, directly over shifting the newly-built cross pipeline, bailey truss girder is laid to parallel cross pipeline, and truss girder both ends are supported on the crown beam of piping lane foundation ditch support wall, then will follow the pre-buried pocket bottom wire rope of cross pipeline and be tied on bailey truss girder for when piping lane excavation, to the protection location of cross pipeline when taking off the time. The invention solves the difficult problem that the foundation pit support is difficult to implement when the underground comprehensive pipe gallery meets crossed pipelines, and simultaneously ensures the construction period, convenient construction, safety and reliability.
Description
Technical Field
The invention belongs to the field of underground pipe gallery construction, and particularly relates to an open cut method-based construction method for an underground pipe gallery in a crossing pipeline.
Background
With the continuous development of the urbanization process and the development and utilization of underground space, the construction of the underground comprehensive pipe gallery enters a high-speed development period. In the construction of urban pipe galleries, the phenomenon that underground pipe galleries are crossed with the existing pipelines (rain sewage, tap water, electric power and the like) inevitably occurs, and the construction environment is increasingly complex. In the open cut method pipe gallery construction process, when the crossed pipelines meet, the construction scheme must be reasonably determined, and protective measures are taken.
Disclosure of Invention
Aiming at the problems, the invention provides a construction method of an underground pipe gallery meeting cross pipelines based on an open cut method, which comprises the following steps:
step one, carrying out supporting construction on a pipe gallery foundation pit without a cross pipeline section:
avoiding the position of the original crossed pipeline to carry out the supporting construction of the pipe gallery foundation pit;
step two, shifting, reconstructing and laying the crossed pipelines:
after the support construction of the pipe gallery foundation pit close to the original cross pipeline is completed, a newly-built cross pipeline is laid in the foundation pit; when the newly-built cross pipeline meets a pipe gallery foundation pit supporting wall, chiseling a pipeline position supporting wall body, and after the newly-built cross pipeline smoothly passes through the supporting wall, accessing the newly-built cross pipeline to an inspection well nearby to be smoothly connected with the original pipeline; the newly-built cross pipeline does not carry out pipe foundation construction within the range of the foundation pit;
step three, newly building cross pipeline protection:
when the newly-built crossed pipeline is laid, presetting a plurality of steel wire ropes for positioning protection at intervals along the pipe body of the newly-built crossed pipeline, installing a Bailey frame above the newly-built crossed pipeline in the foundation pit, wherein the installing direction of the Bailey frame is parallel to the newly-built crossed pipeline, tying the free end of each steel wire rope to a truss beam of the Bailey frame, adjusting the distance of the newly-built crossed pipeline relative to the Bailey frame through a length adjusting mechanism by using the steel wire ropes so as to ensure that each rope of the pipeline can keep the designed elevation and uniformly bear force, fixing and protecting the newly-built crossed pipeline when the pipeline is used for excavating the pipe gallery foundation pit, excavating the original crossed pipeline influencing the pipe gallery foundation pit supporting construction, and continuing to carry out the pipe gallery foundation pit supporting construction;
fourthly, excavating the pipe gallery foundation pit in layers:
after the supporting construction of the pipe gallery foundation pit is completed, earth excavation is carried out in layers; when a new crossed pipeline is built, manual excavation is adopted, and fine adjustment is carried out on a hoisting steel wire rope so as to ensure uniform stress and achieve a fixed protection effect;
fifthly, casting a pipe gallery in situ and backfilling a foundation pit:
after a pipe gallery foundation pit is excavated to the designed bottom elevation, performing cushion layer construction, formwork erection and concrete pouring, performing bilateral symmetrical backfilling after the pipe gallery foundation pit is maintained to the designed strength, performing backfilling in a layered mode from high to low in the substrate drainage direction, and paving backfilling materials in a layered mode;
step six, cross pipeline base treatment:
when the top of the pipe gallery is back filled to the newly-built cross pipeline, performing vertical formwork pouring construction on a cushion layer and a concrete base according to the design requirement of a pipeline base, and removing the steel wire rope after the newly-built cross pipeline is seated; after the strength of the pipeline base concrete meets the requirement, symmetrically and hierarchically backfilling the pipe side;
dismantling the bailey frames:
and after the newly-built cross pipeline base is completed, the bailey frames can be dismantled.
Preferably, the length adjusting mechanism is provided with a bolt fastening groove and an adjusting bolt, the adjusting bolt is in threaded connection with the bolt fastening groove, the steel wire rope is divided into a first section and a second section after passing through the newly-built cross pipeline, the first section and the second section are respectively provided with an upper section part and a lower section part, the upper section part is connected with the adjusting bolt, the lower section part is connected with the bolt fastening groove, the adjusting bolt is screwed, and the adjusting bolt drives the upper section part to move towards the bailey truss or away from the bailey truss.
Preferably, in the first step, the position, type, burying depth and number of the original crossed pipelines are ascertained on site by combining with a design drawing, and the sectional construction scheme of the underground comprehensive pipe gallery foundation pit support is determined by taking the crossed pipelines as boundaries.
Preferably, in the fifth step, the thickness of each layer is manually compacted to be not more than 250mm, the thickness of each layer is mechanically compacted to be not more than 350mm, the waterproof layer is prevented from being damaged, and the compaction coefficient is not less than 0.94.
Preferably, in the third step, when the newly-built cross pipeline is laid, a plurality of protective steel wire ropes are preset every 1-3 m along the pipe body of the newly-built cross pipeline.
By the pipeline protection measures and the construction method provided by the invention, the processes of pipeline moving, foundation pit supporting of an underground pipe gallery, pipe gallery cast-in-place and the like are performed in a crossed and staggered manner, and the construction period is saved.
Drawings
Fig. 1 is a side view of a foundation pit supporting structure and a positioning protection structure provided by the present invention;
fig. 2 is a cross-sectional view of a foundation pit supporting structure and a positioning protection structure provided by the invention;
FIG. 3 is a schematic structural view of a length adjustment mechanism provided in the present invention;
FIG. 4 is a flow chart of a construction method provided by the present invention;
wherein, 1, a foundation pit original ground; 2-bailey frames; 3-a concrete first support beam; 4-a steel wire rope; 5-bolt fastening grooves; 6-cross pipe; 7-basal pit bottom; 8-adjusting bolts 9-crown beams 10-foundation pit supporting structure;
41-first section; 42-a second segment; 43-a positioning sleeve; 411-upper section part; 42-lower section.
Detailed Description
The invention provides a construction method of an underground pipe gallery cross pipeline, as shown in 4, the method comprises the following steps:
step one, carrying out supporting construction on a pipe gallery foundation pit without a cross pipeline section:
the method comprises the steps of combining a design drawing, finding out the position, type, embedding depth and number of original crossed pipelines on site, determining a sectional construction scheme of the underground comprehensive pipe gallery foundation pit support by taking the crossed pipelines as boundaries, and performing pipe gallery foundation pit support construction to avoid the crossed pipeline positions;
step two, shifting, reconstructing and laying the crossed pipelines:
after the supporting construction of the pipe gallery foundation pit close to the original crossed pipeline is completed, rebuilding the crossed pipeline, and moving the crossed pipeline to the completed foundation pit supporting section nearby, as shown in fig. 1 and fig. 2, newly building a crossed pipeline 6; when the newly-built cross pipeline 6 meets the pipe gallery foundation pit supporting wall 10, chiseling a pipeline position supporting wall body, and enabling the newly-built cross pipeline 6 to be smoothly passed through, and then, accessing the newly-built cross pipeline to an inspection well nearby to be smoothly connected with the original pipeline; due to the consideration of the subsequent excavation of the pipe gallery foundation pit, the newly-built cross pipeline 6 does not carry out the construction of the pipe foundation in the range of the foundation pit, and the construction is carried out when the backfilling of the cast-in-place pipe gallery is completed;
step three, newly building cross pipeline protection:
and step two, when the newly-built cross pipeline 6 is laid, installing a positioning protection structure, and specifically operating as follows: a protective steel wire rope 4 is preset every 2m along the pipe body; installing a Bailey truss 2 truss girder (also used as a walking platform) right above a newly-built cross pipeline 6 in a foundation pit, wherein the Bailey truss 2 is parallel to the cross pipeline, two ends of the truss girder are supported on a crown beam 9 of a support wall of the pipe gallery foundation pit, then tying a pocket bottom steel wire rope 4 pre-embedded along the newly-built cross pipeline 6 on the Bailey truss girder, finely adjusting the length of the steel wire rope 4 through a length adjusting mechanism so as to ensure that each rope of the pipeline can keep a designed elevation and uniformly bear force, when the Bailey foundation pit is excavated, fixedly protecting the newly-built cross pipeline 6, excavating the original cross pipeline influencing the support construction of the pipe gallery foundation pit, and carrying out the support construction of the pipe gallery foundation pit;
as shown in fig. 3, the length adjustment mechanism has a bolt fastening slot 5 and an adjustment bolt 8, the adjustment bolt 8 is screwed into the bolt fastening slot 5, specifically, as shown in fig. 2, the steel cable 4 passes through the newly-built crossover duct 6 to form a positioning sleeve 43, and the positioning sleeve is divided into a first section 41 and a second section 42, the first section 41 and the second section 42 each have an upper section 411 and a lower section 412 (refer to fig. 3), the upper section 411 is fixedly connected with the adjustment bolt 8, the lower section 412 is fixedly connected with the bolt fastening slot 5, the adjustment bolt 8 is screwed, and the adjustment bolt 8 drives the upper section 411 to move toward the bailey truss 2 or away from the bailey truss 2;
specifically, in the present embodiment, the bolt fastening groove has a triangular shape, and the adjusting bolt 8 is screwed to the top side of the bolt fastening groove, such that the upper section 411 and the lower section 412 are coaxially arranged, so that the wire rope 4 is disposed perpendicular to the pipe.
Fourthly, excavating the pipe gallery foundation pit in layers:
after the pipe gallery foundation pit supporting construction is completed, the foundation pit supporting structure 10 comprises a foundation pit supporting wall, and a supporting beam 3 and a crown beam 9 which are arranged on the foundation pit supporting wall, wherein the supporting beam 3, the crown beam 9, the original ground 1 of the foundation pit and the foundation pit bottom 7 are shown in figures 1 and 2;
carrying out earth excavation layer by layer; when a new crossed pipeline 6 is built, the hoisting steel wire rope 4 is finely adjusted by adopting manual excavation so as to ensure uniform stress and achieve the fixed protection effect.
Fifthly, casting a pipe gallery in situ and backfilling a foundation pit:
after the pipe gallery foundation pit is excavated to the designed bottom elevation, cushion layer construction and formwork erection are carried out, concrete pouring is carried out, symmetrical backfilling is carried out on two sides after maintenance is carried out to the designed strength, the backfilling sequence is carried out according to the base drainage direction from high to low in a layering mode, backfilling materials are paved in a layering mode, the thickness of each layer is not larger than 250mm through manual tamping, the thickness of each layer is not larger than 350mm through mechanical tamping, the waterproof layer is prevented from being damaged, and the compaction coefficient is not smaller than 0..
Step six, cross pipeline base treatment:
and when the top of the pipe gallery is backfilled to the newly-built cross pipeline, performing vertical formwork pouring construction on the cushion layer and the concrete base according to the design requirements of the pipeline base, and removing the hoisting steel wire rope 4 after the newly-built cross pipeline 6 is seated. And after the strength of the concrete of the pipeline base meets the requirement, symmetrically and hierarchically backfilling the pipe side.
Dismantling the bailey frames:
after the newly-built cross pipeline base is completed, the bailey frames can be dismantled;
firstly, carrying out supporting construction on a pipe gallery section foundation pit without a cross pipeline section, after the construction is finished, moving an adjacent original cross pipeline to a finished foundation pit supporting section, when the cross pipeline is laid in a shifting way, positioning and protecting steel wire ropes are embedded along a pipe body in the range of the foundation pit, temporarily not implementing a concrete base, dismantling the old cross pipeline, and continuing to carry out supporting construction on the pipe gallery foundation pit until the whole construction is finished;
before the excavation after piping lane excavation supporting is accomplished, directly over the newly-built cross pipeline of aversion, bailey truss girder (hold concurrently walking platform) is laid to parallel cross pipeline, truss girder both ends are supported on the crown beam of piping lane foundation ditch revetment, then will follow the pre-buried pocket bottom wire rope of cross pipeline and be tied on bailey truss girder (wire rope slipknot can finely tune length, in order to ensure that each way rope of pipeline can keep the design elevation, even atress), when being used for piping lane excavation, to the protection location when crossing pipeline takes off the hour.
And excavating the pipe gallery foundation pit in layers, constructing a plurality of supports according to the design, casting the pipe outline in situ after excavating to the designed elevation, backfilling the pipe side and the pipe top, constructing the pipe foundation when the pipe side and the pipe top are backfilled to the elevation of the foundation bottom of the cross pipeline, finally dismantling the steel wire rope protection device and the Bailey truss beam, and backfilling the two sides of the cross pipeline in layers.
The invention solves the difficult problem that the foundation pit support is difficult to implement when the underground comprehensive pipe gallery meets crossed pipelines, and simultaneously ensures the construction period, convenient construction, safety and reliability.
The above described in this specification is only illustrative of the present invention; various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (5)
1. A construction method for an underground pipe gallery meeting cross pipelines based on an open cut method is characterized by comprising the following steps: the method comprises the following steps:
step one, carrying out supporting construction on a pipe gallery foundation pit without a cross pipeline section:
avoiding the position of the original crossed pipeline to carry out the supporting construction of the pipe gallery foundation pit;
step two, shifting, reconstructing and laying the crossed pipelines:
after the support construction of the pipe gallery foundation pit close to the original cross pipeline is finished, a new cross pipeline (6) is arranged in the foundation pit; when the newly-built cross pipeline 6 meets the pipe gallery foundation pit supporting wall 10, chiseling a pipeline position supporting wall body, and enabling the newly-built cross pipeline (6) to pass through smoothly, then accessing the inspection well nearby and being connected with the original pipeline smoothly; the newly-built cross pipeline 6 does not carry out pipe foundation construction within the range of the foundation pit;
step three, newly building cross pipeline protection:
when the newly-built cross pipeline (6) is laid, presetting a plurality of steel wire ropes for positioning protection at intervals along the pipe body of the newly-built cross pipeline, installing a Bailey frame above the crown beam along the position right above the newly-built cross pipeline in the foundation pit, enabling the installation direction of the Bailey frame to be parallel to the newly-built cross pipeline (6), tying the free end of each steel wire rope to a truss beam of the Bailey frame, enabling the steel wire ropes to adjust the distance between the newly-built cross pipeline and the Bailey frame through a length adjusting mechanism so as to ensure that each rope of the pipeline can keep a designed elevation and uniformly bear force, and when the steel wire ropes are used for excavating the foundation pit of the pipe gallery, fixedly protecting the newly-built cross pipeline (6), excavating the original cross pipeline influencing the supporting construction of the foundation pit of the pipe gallery, and continuing to;
fourthly, excavating the pipe gallery foundation pit in layers:
after the supporting construction of the pipe gallery foundation pit is completed, earth excavation is carried out in layers; when a new crossed pipeline (6) is built, fine adjustment is carried out on the hoisting steel wire rope (4) by adopting manual excavation so as to ensure uniform stress and achieve a fixed protection effect;
fifthly, casting a pipe gallery in situ and backfilling a foundation pit:
after a pipe gallery foundation pit is excavated to the designed bottom elevation, performing cushion layer construction, formwork erection and concrete pouring, performing bilateral symmetrical backfilling after the pipe gallery foundation pit is maintained to the designed strength, performing backfilling in a layered mode from high to low in the substrate drainage direction, and paving backfilling materials in a layered mode;
step six, cross pipeline base treatment:
when the top of the pipe gallery is back filled to the newly-built cross pipeline, performing vertical formwork pouring construction on a cushion layer and a concrete base according to the design requirement of the pipeline base, and removing the steel wire rope (4) after the newly-built cross pipeline (6) is seated; after the strength of the pipeline base concrete meets the requirement, symmetrically and hierarchically backfilling the pipe side;
dismantling the bailey frames:
and after the newly-built cross pipeline base is completed, the bailey frames can be dismantled.
2. The open-cut method based underground pipe gallery construction method for crossing pipelines, according to claim 1, is characterized in that: the length adjusting mechanism is provided with a bolt buckle groove and an adjusting bolt, the adjusting bolt is in threaded connection with the bolt buckle groove, the steel wire rope penetrates through the newly-built cross pipeline and is divided into a first section and a second section, the first section and the second section are respectively provided with an upper section part and a lower section part, the upper section part is connected with the adjusting bolt, the lower section part is connected with the bolt buckle groove, the adjusting bolt is screwed, and the adjusting bolt drives the upper section part to move towards the bailey truss or move away from the bailey truss.
3. The open-cut method based underground pipe gallery construction method for crossing pipelines, according to claim 1, is characterized in that: in the first step, a design drawing is combined, the position, the type, the burying depth and the number of the original crossed pipelines are ascertained on site, and the sectional construction scheme of the underground comprehensive pipe gallery foundation pit support is determined by taking the crossed pipelines as boundaries.
4. The open-cut method based underground pipe gallery construction method for crossing pipelines, according to claim 1, is characterized in that: in the fifth step, the thickness of each layer is manually tamped to be not more than 250mm, the thickness of each layer is mechanically tamped to be not more than 350mm, the waterproof layer is prevented from being damaged, and the tamping coefficient is not less than 0.94.
5. The open-cut method based underground pipe gallery construction method for crossing pipelines, according to claim 1, is characterized in that: and in the third step, when the newly-built cross pipeline is laid, presetting a plurality of protective steel wire ropes every 1-3 m along the pipe body of the newly-built cross pipeline.
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| CN110424517A (en) * | 2019-07-31 | 2019-11-08 | 中国十七冶集团有限公司 | A kind of underground pipe gallery construction rain sewage in urban core region is relocated construction method |
| CN110332412B (en) * | 2019-07-31 | 2023-12-29 | 南方工程检测修复技术研究院 | Broken wire PCCP excavation restoration supporting device and construction method thereof |
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