CN113802600A - Construction method for excavating and installing pipeline in narrow space - Google Patents
Construction method for excavating and installing pipeline in narrow space Download PDFInfo
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- CN113802600A CN113802600A CN202111068796.0A CN202111068796A CN113802600A CN 113802600 A CN113802600 A CN 113802600A CN 202111068796 A CN202111068796 A CN 202111068796A CN 113802600 A CN113802600 A CN 113802600A
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- 238000010276 construction Methods 0.000 title claims abstract description 130
- 238000000034 method Methods 0.000 claims abstract description 9
- 230000003014 reinforcing effect Effects 0.000 claims description 32
- 229910000831 Steel Inorganic materials 0.000 claims description 29
- 239000010959 steel Substances 0.000 claims description 29
- 239000002689 soil Substances 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 9
- 239000004568 cement Substances 0.000 claims description 8
- 238000003466 welding Methods 0.000 claims description 8
- 238000009412 basement excavation Methods 0.000 description 14
- 210000003205 muscle Anatomy 0.000 description 13
- 230000002787 reinforcement Effects 0.000 description 10
- 238000009434 installation Methods 0.000 description 7
- 239000002023 wood Substances 0.000 description 7
- 238000004364 calculation method Methods 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 231100000817 safety factor Toxicity 0.000 description 3
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/10—Tunnels or galleries specially adapted to house conduits, e.g. oil pipe-lines, sewer pipes ; Making conduits in situ, e.g. of concrete ; Casings, i.e. manhole shafts, access or inspection chambers or coverings of boreholes or narrow wells
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/18—Making embankments, e.g. dikes, dams
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
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Abstract
The invention provides a construction method for excavating and installing pipelines in a narrow space, which comprises the following steps: step S1: providing an excavator and processing a plurality of construction support frames for a narrow space on site; step S2: breaking the road surface; step S3: excavating a road surface to obtain a first foundation pit section, and placing a first construction support frame for a narrow space into the foundation pit section; step S4: continuously excavating a first foundation pit section along the pavement to obtain an Nth foundation pit section, wherein the Nth foundation pit section is communicated with the (N-1) th foundation pit section, and the Nth construction support frame for the narrow space is placed in the Nth foundation pit section; step S5: placing a pre-installed pipe segment into the foundation pit; step S6: connecting a plurality of pre-installed pipeline sections and installing other residual pre-installed pipeline sections; step S7: hanging away a construction support frame for a narrow space; step S8: and backfilling the foundation pit. The method not only occupies small construction space, but also can ensure the safety of construction.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of urban pipeline construction, in particular to a construction method for excavating and installing pipelines in a narrow space.
[ background of the invention ]
With the rapid development of cities, pipe networks around the cities are more and more complex, and a water supply system, a sewage discharge system, a rainwater pipe network system and the like are required. In order to realize sponge city and city rain and sewage diversion, the construction of city pipe network is a necessary and difficult project for people to do practical works.
Urban pipelines are arranged underground, and the pipelines can be installed only by excavating urban roads and roadways. When the excavation depth of the foundation pit is less than 3m, adopting one-time slope-placing excavation, and immediately adopting steel sheet piles and wood piles to carry out full-section support if a soft soil section is found in excavation, wherein the method comprises the following specific steps:
firstly, breaking hardened cement on a road surface to expose soil;
secondly, vertically driving a row of steel plate piles or wood piles into two sides of the broken pavement, and additionally arranging internal supporting bars on the steel plate piles if the soil is soft;
thirdly, excavating soil to form a pipeline foundation pit;
fourthly, putting the mixture into a pipeline;
fifthly, backfilling the foundation pit;
sixthly, removing the internal support bars;
seventhly, pulling out the steel sheet piles;
and eighthly, backfilling the soil position driven into the steel sheet pile or the wood pile by using cement.
The above steps have the following problems:
first, in taking place the landslide and slide into the foundation ditch for avoiding earth, the top both sides that the foundation ditch corresponds the steel sheet pile need set up certain slope, and the setting on slope (put the slope promptly) excavation and steel sheet pile or stake strut the place that will be great, but be difficult to realize when constructing in the tunnel of narrow and small spaces such as village in the city, and the foundation ditch need adopt the vertical excavation in a flexible way this moment. When the vertical excavation is adopted, the side wall of the foundation pit is in a self-stabilizing state after the pipeline foundation pit is excavated and formed by the earth layer according to the construction requirements, but along with the construction, the load borne by the side wall of the foundation pit is gradually increased, the earth landslide is easy to occur towards the interior of the foundation pit from the most unfavorable sliding surface after the load exceeds a certain load, and the construction safety is difficult to guarantee at the moment.
Secondly, when the urban underground pipelines and the lines are too complex, large-area foundation pits cannot be excavated, so that construction is difficult to carry out.
Thirdly, a vibratory hammer and a digger are required to be used for construction when a steel sheet pile or a wood pile is driven, and the vibration generated by the vibratory hammer can cause the resonance of the ground, so that the daily life of nearby residents is influenced.
Fourthly, after the foundation pit is vertically excavated, the pipeline installation process also comprises the work performed in the foundation pit such as foundation bearing capacity detection, pipeline installation connection, water closing test, backfilling protective pipe sand and the like, and occasionally falling objects fall into the foundation pit during construction, so that the safety of constructors is threatened.
Fifthly, the pile hole position of the steel plate pile or the wood pile needs to be backfilled by cement after construction is completed, the work is complicated, and the construction period is prolonged.
[ summary of the invention ]
The present invention is directed to solve at least one of the above-mentioned problems, and provides a construction method for excavating and installing a pipeline in a narrow space, which not only occupies a small construction space but also can ensure the safety of construction.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a construction method for excavating and installing pipelines in a narrow space comprises the following steps:
step S1: the construction support frame for the narrow space comprises a frame body, wherein a lifting lug is arranged on one side of the frame body, the length of the frame body is equal to 1/N of the length of a preassembled pipeline section, a pipe laying channel is arranged on the frame body, and the pipe laying channel penetrates through the two opposite ends of the frame body and one side, away from the lifting lug, of the frame body;
step S2: adopting an excavator to break the hardened cement on the pavement and expose a mud layer;
step S3: excavating a mud layer to obtain a first foundation pit section, wherein two side surfaces of the foundation pit section are vertical to the horizontal plane, and the first construction support frame for the narrow space is placed in the foundation pit section to enable the pipe laying channel to be communicated with the first foundation pit section;
step S4: continuously excavating a first foundation pit section along a mud layer to obtain an Nth foundation pit section, wherein the Nth foundation pit section is communicated with the (N-1) th foundation pit section, putting the Nth construction support frame for the narrow space into the Nth foundation pit section, and splicing the Nth construction support frame for the narrow space and the (N-1) th construction support frame for the narrow space; continuously excavating a soil layer and placing the construction support frame for the narrow space, and stopping when the total length of N construction support frames for the narrow space is equal to the length of one preassembled pipeline section, wherein N is not less than 2, N is equal to the length of one preassembled pipeline section/the length of one top frame, and N foundation pit sections are communicated to form a foundation pit for installing one preassembled pipeline section;
step S5: placing one of the pre-installed pipeline sections into the foundation pit from a pipe laying channel of a construction support frame for a narrow space, which is located at the end of the foundation pit;
step S6: repeating steps S4 and S5, connecting a plurality of pre-installed conduit segments and performing installation work on the remaining pre-installed conduit segments;
step S7: hoisting all the construction support frames for the narrow space in the foundation pit away from the foundation pit;
step S8: and backfilling the foundation pit.
Further, the support body includes top frame and support column, one side of top frame is equipped with the lug, the one end of support column is connected the top frame deviates from one side of lug, the other end of support column is towards deviating from last the direction of top frame extends.
Furthermore, the number of the support columns is two, and the two groups of support columns are arranged at intervals along the width direction of the top frame; and the group of supporting columns comprises two supporting columns, and the two supporting columns are arranged at intervals along the length direction of the top frame.
Further, the support body includes the side reinforcement muscle, the one end of side reinforcement muscle is connected the side of top frame, the other end of side reinforcement muscle is connected the support column.
Further, the support body includes the tip reinforcing muscle, the tip of top frame is connected to the one end of tip reinforcing muscle, the other end of tip reinforcing muscle is connected the support column.
Further, the top frame is formed by welding four steel materials, and the support column, the side reinforcing ribs and the end reinforcing ribs are made of steel materials.
Further, the support body includes top baffle and side shield, the top baffle with the top frame is equipped with one side releasable connection of lug, the side shield with the support column deviates from one side releasable connection of pipe laying passageway and with the top frame contact.
Furthermore, two adjacent construction supporting frames for the narrow space are detachably connected through bolts;
in steps S4 to S6, the nth construction support for a narrow space is detachably coupled to the N-1 th construction support for a narrow space by the bolt.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
1. according to the construction method for excavating and installing the pipeline in the narrow space, two side surfaces of the foundation pit section are vertical to the horizontal plane, namely two side surfaces of the foundation pit formed by final excavation are vertical to the horizontal plane, namely the excavated foundation pit can meet the requirement of installing the pre-installed pipeline section; and the side face of the construction support frame used for narrow space can play a role of blocking soil when soil landslide occurs on two side faces of the foundation pit. Therefore, the construction method not only occupies small construction space, but also can ensure the safety of construction.
2. When the construction method for excavating and installing the pipeline in the narrow space is adopted, steel sheet piles or wood piles do not need to be driven into the road surface, pile holes are not left after the installation of the pre-installed pipeline segments is completed, namely cement backfilling is not needed, therefore, the construction method not only greatly reduces ground resonance, thereby reducing the influence on the daily life of nearby residents, but also simplifies the construction steps and greatly shortens the construction period.
3. The top baffle is arranged, so that objects falling from high altitude which possibly happen can be singly blocked, and the safety of constructors is further protected.
[ description of the drawings ]
Fig. 1 is a schematic structural view of a construction support frame for a narrow space according to a preferred embodiment of the present invention.
Fig. 2 is a schematic structural view of the construction support frame for a narrow space after the top baffle and the side baffles are removed.
Fig. 3 is a construction view illustrating a construction method for excavating and installing a pipeline in a narrow space according to a preferred embodiment of the present invention.
Fig. 4 is basic information of a pit according to a preferred embodiment of the present invention.
Fig. 5 is soil information of the sidewall of the trench according to a preferred embodiment of the present invention.
Fig. 6 shows soil layer parameters of the sidewall of the trench according to a preferred embodiment of the present invention.
Fig. 7 is a schematic diagram of a most unfavorable sliding surface when the vertical excavation working condition of the foundation pit of 2 meters is calculated by using the main and positive foundation pit.
Fig. 8 is a calculation result of natural slope release according to a preferred embodiment of the present invention.
In the attached drawing, 100-construction support frames used for narrow spaces, 1-frame bodies, 10-pipe laying channels, 11-top frames, 12-supporting columns, 121-limiting blocks, 13-side reinforcing ribs, 14-end reinforcing ribs, 15-top baffles, 16-side baffles, 2-lifting lugs, 200-foundation pits, 201-foundation pit sections, 300-preassembled pipeline sections and 400-excavating machines.
[ detailed description ] embodiments
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1 to 3, a preferred embodiment of the present invention provides a construction support frame 100 for a narrow space, which is used for installing a pipeline after excavating a road surface in the narrow space, wherein the pipeline includes a plurality of pre-installed pipeline segments 300.
In the present embodiment, the frame body 1 includes a top frame 11 and a support column 12. A lifting lug 2 is arranged on one side of the top frame 11, one end of each supporting column 12 is connected with one side, away from the lifting lug 2, of the top frame 11, the other end of each supporting column 12 extends in the direction away from the upper top frame 11, specifically, the number of the supporting columns 12 is two, and the two groups of supporting columns 12 are arranged at intervals in the width direction of the top frame 11; the set of support columns 12 includes two support columns 12, the two support columns 12 are spaced apart along the length direction of the top frame 11, and one end of each support column 12 is welded to the top frame 11. The two sets of support posts 12 form a pipe laying channel 10 with the side of the top frame 11 facing away from the lifting lug 2.
In this embodiment, the frame body 1 further includes side reinforcing ribs 13 and end reinforcing ribs 14. The side of top frame 11 is connected to the one end of side reinforcement muscle 13, and support column 12 is connected to the other end of side reinforcement muscle 13, and is concrete, and the relative both sides of support body 1 all are equipped with a pair of side reinforcement muscle 13, and two side reinforcement muscle 13 mutual symmetries in a pair of side reinforcement muscle 13 set up, and the one end of a side reinforcement muscle 13 welds in the side of top frame 11, and the other end of side reinforcement muscle 13 welds on the support column 12 of corresponding one end.
The tip of top frame 11 is connected to the one end of tip reinforcing rib 14, and support column 12 is connected to the other end of tip reinforcing rib 14, and is concrete, and the relative both ends of support body 1 all are equipped with a pair of tip reinforcing rib 14, and two tip reinforcing ribs 14 of a pair of tip reinforcing rib 14 symmetry each other set up, and the one end of a tip reinforcing rib 14 welds in the tip of top frame 11, and the other end of tip reinforcing rib 14 welds on the support column 12 of corresponding one end. The arrangement of the side reinforcing ribs 13 and the end reinforcing ribs 14 can strengthen the structure of the whole frame body 1, so that the frame body 1 is more stable when blocking the overturning soil.
In the present embodiment, the top frame 11 is formed by welding four steel materials, specifically, the top frame 11 is a rectangular frame formed by welding four steel materials, and the lifting lug 2 is welded to one side of the steel materials; the support columns 12, the side reinforcing ribs 13 and the end reinforcing ribs 14 are made of steel, and specifically, the four steel materials of the top frame 11, the support columns 12, the side reinforcing ribs 13 and the end reinforcing ribs 14 are made of channel steel. The construction support frame 100 for the narrow space is formed by welding common channel steel in the prior art, can be manufactured on the construction site according to the length and the width of the pre-installed pipeline segment 300 to be installed, and has the characteristic of easy assembly and manufacture, so that the construction cost can be saved, and the construction progress can be accelerated.
In this embodiment, the frame body 1 further includes a top baffle 15 and a side baffle 16. Top apron 15 and top frame 11 are equipped with one side releasable connection of lug 2, and is specific, and lug 2 welding is in the outside that top frame 11 deviates from a side of support column 12 to make top frame 11 deviate from the inboard of a side of support column 12 and form a face of accepting, top apron 15 is accepted on aforementioned face of accepting, and when in actual use, can adopt the screw with top apron 15 demountable installation on accepting the face. Side dam 16 and support column 12 deviate from one side releasable connection of pipe laying passageway 10 and with the contact of top frame 11, specifically, when in actual use, available wire rope with side dam 16 releasable mounting in the support column 12 deviate from one side of pipe laying passageway 10, side dam 16 can block the earth that topples.
In this embodiment, a construction support frame 100 for narrow and small space is a plurality of concatenations when using and uses, and wherein, two adjacent construction support frames 100 for narrow and small space adopt bolt releasable connection, and are specific: threaded holes are reserved in the support columns 12, and two adjacent support columns 12 of the construction support frame 100 for a narrow space can be detachably connected through the threaded holes by bolts.
In this embodiment, a method for installing a plurality of pre-installed pipe segments 300 having a length of 6 meters is exemplified, and when the pre-installed pipe segments 300 having a length of 6 meters are installed, a foundation pit 200 to be excavated has a width of 2 meters and a height of 2 meters, and specifically includes the following steps:
step S1: the construction support frame 100 is processed on site according to the construction requirements of the pre-installed pipeline segments 300, and an excavator 400 in the prior art is provided, namely, four channel steels are welded into a top frame 11 on the construction site, the top frame 11 is rectangular, and the top frame 11 is 3 meters long and 2 meters wide; welding the lifting lug 2 to one side of the top frame 11; welding one ends of four channel steels at four end points of one side of the top frame 11, which is far away from the lifting lug 2, respectively, wherein the four channel steels are support columns 12, and threaded holes are reserved in the support columns 12; a pair of side reinforcing ribs 13 are respectively welded on two opposite sides of the top frame 11 by using channel steel; a pair of end reinforcing ribs 14 are respectively welded to the two opposite ends of the top frame 11 by using channel steel; mounting the top baffle 15 on one side of the top frame 11 provided with the lifting lug 2 by using screws; installing a side baffle 16 on one side of the support column 12, which is far away from the pipe laying channel 10, by using a steel wire rope; the construction support 100 for a narrow space is finished.
Step S2: the hardened cement on the road surface is broken by the excavator 400, and the soil layer is exposed.
Step S3: adopt excavator 400 to excavate the dirt bed, obtain a first section foundation ditch section 201, the length of foundation ditch section 201 is 3 meters, two sides and the horizontal plane of foundation ditch section 201 are perpendicular, adopt excavator 400 to put into foundation ditch section 201 through 2 lugs that are used for the construction support frame 100 in narrow and small space with the first construction support frame 100 that is used for in narrow and small space, make pipe laying passageway 10 and first foundation ditch section 201 intercommunication, and make the one end that support column 12 deviates from top frame 11 contact with the bottom surface of foundation ditch section 201.
Step S4: continuing to excavate along the earth layer to obtain an Nth foundation pit section 201, wherein the Nth foundation pit section 201 is communicated with the (N-1) th foundation pit section 201, putting the Nth construction support frame 100 for the narrow space into the Nth foundation pit section 201 with reference to the step S3, splicing the Nth construction support frame 100 for the narrow space and the (N-1) th construction support frame 100 for the narrow space, and fixing the two construction support frames 100 at the threaded hole of the support column 12 by using a bolt; continuously excavating a soil layer and placing construction support frames 100 for narrow spaces, and stopping when the total length of N construction support frames 100 for narrow spaces is equal to the length of one pre-installed pipeline segment 300, wherein N is not less than 2, N is equal to the length of one pre-installed pipeline segment 300/the length of one top frame 11, and N foundation pit segments 201 are communicated to form a foundation pit 200 for installing one pre-installed pipeline segment 300; in this embodiment, N is 2, continue to carry out the soil layer excavation along first foundation ditch section 201, obtain a second foundation ditch section 201, second foundation ditch section 201 communicates with first foundation ditch section 201, put into second foundation ditch section 201 with the second construction support frame 100 that is used for narrow and small space, splice the second construction support frame 100 that is used for narrow and small space and the first construction support frame 100 that is used for narrow and small space and fix with the bolt, two total lengths that are used for construction support frame 100 of narrow and small space are 6 meters, then no longer continue to excavate the road surface.
Step S5: a pre-installed pipe section 300 is placed into the foundation pit 200 from the pipe-laying channel 10 of the construction support 100 at the end of the foundation pit 200. In the actual construction process, after the excavator 400 is adopted to excavate the foundation pit section 201, an inclined plane can be formed at one end of the foundation pit section 201, which is deviated from the previous foundation pit section 201, and when the pre-installed pipeline section 300 is placed, the inclined plane and the foundation pit 200 can form an inclined space for placing the pre-installed pipeline section 300 into the foundation pit 200.
Step S6: after repeating steps S4 and S5, a plurality of pre-installed conduit segments 300 are connected and the remaining pre-installed conduit segments 300 are installed.
Step S7: all the construction supports 100 for the narrow space in the foundation pit 200 are lifted away from the foundation pit 200.
Step S8: the foundation pit 200 is backfilled to bury the plurality of pre-installed conduit segments 300 in the foundation pit 200.
In step S3, after the foundation pit section 201 is excavated, two sides of the foundation pit section 201 are perpendicular to the horizontal plane, that is, two sides of the foundation pit 200 finally excavated are perpendicular to the horizontal plane, which indicates that the excavated foundation pit 200 can meet the requirement for installing the pre-installed pipe segments 300.
It can be known from steps S4 and S5 that the above construction method is to excavate the foundation pit sections 201 one by one and place the construction support frame 100 into the foundation pit section 201 after the excavation, and if soil landslide occurs during the continuous excavation process after the construction support frame 100 is placed, the construction support frame 100 that has been placed into the foundation pit section 201 can protect the side wall of the foundation pit section 201, thereby avoiding the need to excavate the foundation pit section 201 that has been overturned again, and accelerating the construction progress. In addition, the influence on the life of residents due to the vibration of the dredger 400 can be avoided.
Basic information of a foundation pit 200 to be excavated when a single pre-installed pipeline segment 300 with the length of 6 meters is installed is shown in fig. 4, soil layer information of the side wall of the foundation pit 200 is shown in fig. 5, soil layer parameters of the side wall of the foundation pit 200 are shown in fig. 6, and based on the data of fig. 4 to 6, the worst sliding surface is calculated by adopting regular deep foundation pit software under the vertical excavation working condition of 2 meters of foundation pit is shown in fig. 7, namely, the track number 1 and the track number 2 are two common working conditions under the condition that the side wall of the foundation pit is 0 overload number. The natural slope-releasing calculation is performed for track number 1 and track number 2, and the obtained result is shown in fig. 8, and it can be known from fig. 8 that: the safety factor of the side wall of the foundation pit at the track number 1 is 1.611, the safety factor at the track number 2 is 1.390, and both the safety factors exceed 1.2, which indicates that the foundation pit obtained by adopting an excavator to carry out vertical excavation is in a self-stabilizing state.
In addition, the total load of the sliding surface soil body under the special stacking working condition is calculated according to the worst sliding surface as follows: the load on the single side of the construction scaffolding 100 was calculated from 10.0 × 6, which is 60KN, with 10.0 being the floating weight and 6 being the volume of the sliding soil: based on the load, the construction support frame 100 is subjected to stress analysis and checking calculation by midas civil software, so that the following can be obtained:
first, the stiffness of the construction prop 100 is calculated as: the maximum displacement delta is 6.12< L/400 is 7.5(mm), and the construction safety requirement is met.
Second, the structural strength of the construction support 100 is checked: the allowable stress method is adopted for calculation, the channel steel is made of Q235 materials, the allowable value of the combined normal stress is 145MPa, the maximum combined stress of the rod piece is 131.9MPa and is less than 145MPa, and the construction safety requirement is met.
Thirdly, checking the structural stability of the construction support frame 100: the buckling modal characteristic values are all larger than 4, and the construction safety requirement is met.
To sum up, the structural performance of the construction support frame 100 for the narrow space when the soil landslide occurs on the side surface of the foundation pit 200 can meet the construction safety requirement, namely, the effect of blocking the soil landslide and enhancing the construction safety can be achieved.
In addition, in the construction method for excavating and installing the pipeline in the narrow space, the construction support frame 100 used in the narrow space is processed on site according to the length and width of the pre-installed pipeline segment 300 to be installed on the construction site, so that the assembly degree of the construction support frame 100 used in the narrow space is high, the construction flexibility is improved, the construction cost can be saved, and the whole construction progress can be accelerated. And the method can backfill the foundation pit 200 after the installation of the pre-installed pipeline segments 300 with a certain length is completed, can shorten the time of the road surface in an excavation state to the maximum extent, reduces the possibility of soil landslide to the minimum, not only improves the construction safety, but also maintains the stability of the road surface to the maximum extent. Therefore, the construction method not only occupies small construction space, but also can ensure the safety of construction.
When the construction method for excavating and installing the pipeline in the narrow space is adopted, steel sheet piles or wood piles do not need to be driven into the road surface, pile holes do not remain after the installation of the pre-installed pipeline segments 300 is completed, namely, the pile holes do not need to be backfilled with cement, so that the method not only greatly reduces ground resonance, thereby reducing the influence on the daily life of nearby residents, but also simplifies the construction steps and greatly shortens the construction period.
The top baffle 15 can block the falling object, so as to further protect the safety of the constructors.
It is understood that in other embodiments, the dimensions of the construction jig 100 and the foundation pit 200 for a small space may be specifically set according to the size of the pre-installed pipe segment 300 to be installed, and are not limited to those exemplified in the present embodiment.
The above description is intended to describe in detail the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the claims of the present invention, and all equivalent changes and modifications made within the technical spirit of the present invention should fall within the scope of the claims of the present invention.
Claims (8)
1. A construction method for excavating and installing pipelines in a narrow space is characterized by comprising the following steps:
step S1: the construction support frame (100) for the narrow space is processed on site according to the construction requirement of a pre-installed pipeline section (300) and an excavator (400) in the prior art is provided, the construction support frame (100) for the narrow space comprises a frame body (1), a lifting lug (2) is arranged on one side of the frame body (1), the length of the frame body (1) is equal to 1/N of the length of the pre-installed pipeline section (300), a pipe laying channel (10) is arranged on the frame body (1), and the pipe laying channel (10) penetrates through the two opposite ends of the frame body (1) and one side, away from the lifting lug (2), of the frame body (1);
step S2: adopting an excavator (400) to break the hardened cement on the pavement and expose a mud layer;
step S3: excavating a mud layer to obtain a first foundation pit section (201), wherein two side surfaces of the foundation pit section (201) are vertical to the horizontal plane, and the first construction support frame (100) for the narrow space is placed in the foundation pit section (201) to enable the pipe laying channel (10) to be communicated with the first foundation pit section (201);
step S4: continuously excavating a first foundation pit section (201) along a soil layer to obtain an Nth foundation pit section (201), wherein the Nth foundation pit section (201) is communicated with the (N-1) th foundation pit section (201), putting the Nth construction support frame (100) for the narrow space into the Nth foundation pit section (201), and splicing the Nth construction support frame (100) for the narrow space and the (N-1) th construction support frame (100) for the narrow space; continuously excavating a soil layer and placing the construction support frame (100) for the narrow space, and stopping when the total length of N construction support frames (100) for the narrow space is equal to the length of one pre-installed pipeline section (300), wherein N is not less than 2, N is equal to the length of one pre-installed pipeline section (300)/the length of one top frame (11), and N foundation pit sections (201) are communicated to form a foundation pit (200) for installing one pre-installed pipeline section (300);
step S5: placing one of the pre-installed pipe sections (300) into the foundation pit (200) from a pipe-laying channel (10) of a construction support (100) for a narrow space at the end of the foundation pit (200);
step S6: repeating steps S4 and S5, connecting a plurality of pre-installed conduit segments (300), and installing the remaining pre-installed conduit segments (300);
step S7: hoisting all the construction supports (100) for the narrow space in the foundation pit (200) away from the foundation pit (200);
step S8: backfilling the foundation pit (200).
2. The construction method for excavating and installing a pipeline in a narrow space according to claim 1, wherein: the support body (1) comprises a top frame (11) and a supporting column (12), a lifting lug (2) is arranged on one side of the top frame (11), one end of the supporting column (12) is connected with the side, deviating from the lifting lug (2), of the top frame (11), and the other end of the supporting column (12) extends towards the direction deviating from the top frame (11).
3. The construction method for excavating and installing a pipeline in a narrow space according to claim 2, wherein: the number of the supporting columns (12) is two, and the two groups of supporting columns (12) are arranged at intervals along the width direction of the top frame (11); the group of the supporting columns (12) comprises two supporting columns (12), and the two supporting columns (12) are arranged at intervals along the length direction of the top frame (11).
4. The construction method for excavating and installing a pipeline in a narrow space according to claim 3, wherein: the support body (1) comprises side reinforcing ribs (13), one ends of the side reinforcing ribs (13) are connected with the side edges of the top frame (11), and the other ends of the side reinforcing ribs (13) are connected with the supporting columns (12).
5. The construction method for excavating and installing a pipeline in a narrow space according to claim 4, wherein: the support body (1) comprises an end reinforcing rib (14), one end of the end reinforcing rib (14) is connected with the end of the top frame (11), and the other end of the end reinforcing rib (14) is connected with the supporting column (12).
6. The construction method for excavating and installing a pipeline in a narrow space according to claim 5, wherein: the top frame (11) is formed by welding four steel materials, and the support column (12), the side reinforcing ribs (13) and the end reinforcing ribs (14) are made of steel materials.
7. The method for excavating and installing a pipeline in a narrow space according to any one of claims 2 to 6, wherein: the support body (1) comprises a top baffle (15) and a side baffle (16), the top baffle (15) and the top frame (11) are provided with one side detachable connection of the lifting lug (2), the side baffle (16) and the supporting column (12) deviate from one side detachable connection of the pipe laying channel (10) and contact with the top frame (11).
8. The construction method for excavating and installing a pipeline in a narrow space according to claim 7, wherein: the adjacent two construction support frames (100) for the narrow space are detachably connected by bolts;
in steps S4 to S6, the Nth construction support frame (100) for the narrow space is detachably connected with the N-1 th construction support frame (100) for the narrow space through the bolt.
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| CN202111068796.0A CN113802600A (en) | 2021-09-13 | 2021-09-13 | Construction method for excavating and installing pipeline in narrow space |
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| CN202111068796.0A CN113802600A (en) | 2021-09-13 | 2021-09-13 | Construction method for excavating and installing pipeline in narrow space |
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