CN107587528A - It is a kind of to protect the design and construction method across the underground high voltage cable box culvert of foundation ditch - Google Patents
It is a kind of to protect the design and construction method across the underground high voltage cable box culvert of foundation ditch Download PDFInfo
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Abstract
The invention provides a kind of design and construction method for the underground high voltage cable box culvert protected and cross over foundation ditch, including：Cable box culvert data is collected, determines cable box culvert globality；Surveying and locating, determine cable box culvert and fender post position；Cable box culvert soil at both sides is excavated, presets steel I-beam；Draw except cable box culvert lower recess soil, and apply connecting rod；Triangle square steel frame is welded in each connecting rod two end；Lifting i-beam frame simultaneously anchors；After concrete hardening, draw except the soil body between groove, and the welded reinforcement mesh sheet between the lower link of cable box culvert, and gunite concrete anchors.The present invention solves the problems, such as to be embedded with underground high voltage cable box culvert on constructing tunnel passage, more effectively ensure the safety of cable box culvert with I-shaped bracing members, avoid the relocating work of cable box culvert, the duration has been saved for whole work progress, efficiency of construction has been improved, save removal charge, reduce construction cost, and has alleviated the influence to surrounding resident.
Description
Technical field
It is specifically one kind cast-in-place support to across base the present invention relates to a kind of method of construction engineering technical field
The design and construction method that the underground high voltage cable box culvert in hole is protected.
Background technology
In recent years, with the quickening of Urbanization in China and the rapid growth of urban population, urban ground traffic system
Increasingly congestion, urban track traffic are developed rapidly in each big and medium-sized cities.In the construction of urban track traffic, often
Run into the City Buried Pipelines such as underground high voltage cable.In work progress, part unit in charge of construction constructs by force to work to tight deadlines, and pole has
The City Buried Pipelines such as underground high voltage cable may be forced large deformation occur or produce destruction.And the buried pipe such as underground high voltage cable
Line is the important infrastructure for ensureing city operations, especially underground high voltage cable, and importance is high, is influenceed big.And underground high-voltage
Cable usually occurs at track traffic station foundation ditch and constructing tunnel passage, it is difficult to avoids, it is necessary to be protected by.At present
Safeguard measure to underground high voltage cable is typically to cut to change underground utilities, or by underground high voltage cable temporary shift to expand road
Face, treat to then move to original position after the completion of engineering.But not only cost is high for the migration position that changes of underground high voltage cable, time-consuming, delays work
Phase, and seriously hinder the normal life of resident nearby.If can be protected in underground high voltage cable original place, guarantor will be greatly simplified
Shield measure, the waste of manpower financial capacity is reduced, mitigate the influence to society.Therefore, a kind of setting for high-tension cable in-situ conservation is invented
Meter construction technology has highly important engineering application value.
By being found to existing patent retrieval, the existing in-situ conservation construction method to high-tension cable relates generally to cable
The suspension protection method of box culvert, Chinese Patent Application No. 201410853049.1, application publication number are CN 104518473
A, patent name are：Cable box culvert pipe line suspension protection structure and method, the patent readme are：" present invention is by cable box
The top of the stake of culvert both sides is parallel longitudinal to shelve crossbeam, and some top shaped steel are arranged at intervals on the crossbeam, excavate box culvert two
The side soil body, steel plate is laid in box culvert bottom, corresponding top shaped steel sets bottom shaped steel, then connects top and bottom type with steel wire rope
Steel suspends in midair to box culvert." however, cable box culvert guard method described in the invention require to have beside box culvert position it is parallel
What is set shelves crossbeam, the protection of cable box culvert and is not applied on the constructing tunnel passage for not shelving crossbeam, meanwhile, should
Technology carries out suspension protection using steel wire rope, and prolonged suspend in midair easily makes steel wire rope that creep, and scene occur under big load
Because transporting equipment frequently comes in and goes out scene under Construction State, the careless slightly steel wire rope that may encounter suspension apparatus, make box culvert
Roll, and steel wire rope is then it is possible that unbalance stress, local stress increase, are broken, thing may be caused when serious
Therefore workmen's life is endangered, waste the wealth of society.
The content of the invention
The present invention be directed to prior art above-mentioned deficiency, propose it is a kind of it is simple, convenient, and reliable with cast-in-place support to cross over
The design and construction method that the underground high voltage cable box culvert of foundation ditch is protected, calculated with tight design, for applying for track traffic
The protection problem of underground utilities proposes rationally reliable solution in work, avoids the extension of construction period, construction cost
Increase and the adverse effect constructed to society.
The present invention makes what is be achieved through the following technical solutions：
The present invention provides a kind of design and construction method for the underground high voltage cable box culvert protected and cross over foundation ditch, including following step
Suddenly：
The first step, cable box culvert related data is collected, determine cable box culvert globality；Including：
(1) according to the related data of cable box culvert, cable box culvert weight G is determined；
(2) according to cable box culvert weight G, size and cable box culvert concrete strength, if it is determined that do not apply safeguard measure,
Maximal bending moment M when cable box culvert suspends in midair naturallymaxWith the moment of inertia I；
(3) the maximum (normal) stress σ during suspention of cable box culvert is determinedmax, and contrast the allowable tensile stress of cable slab culvert concrete
[σ], according to《Code for design of concrete structures》(GB 50010-2010) is obtained, and checks the globality intensity of cable box culvert；It is described
σmaxDetermined by following formula：
For [σ]<σmaxIf expression does not apply safeguard measure, cable box culvert is suspended in midair naturally, cable box culvert can be by broken
Bad, the globality of cable box culvert is bad, it is necessary to carry out supporting in advance；
Second step, surveying and locating, determine cable box culvert and fender post position；
I.e.：Using total powerstation according to construction drawing, cable box culvert is determined and positioned at foundation ditch both sides, cable box culvert both sides and most
Close to four fender post positions of cable box culvert, checked by least two people；Selection represents contour line on the profile of cable box culvert
8~12 points carry out mark, fine rule is pulled between mark, and mark is carried out in fender post center, is gone along with sb. to guard him adjacent two
Fine rule is pulled between stake, and lime is sprinkled with ground along fine rule；
3rd step, cable box culvert soil at both sides is excavated, preset steel I-beam；Including：
(1) with the cable box culvert soil at both sides in excavator excavation pit apart from more than box culvert 50cm；
(2) manual type is used, the remaining whole soil bodys in excavation pit inner cable box culvert both sides, forms cable duct；
(3) manual type is used, four grooves are excavated in foundation pit side-wall, makes four grooves respectively positioned at four on foundation ditch side
Fender post is away from box culvert side and adjacent fender post, and retaining groove bottom flushes with cable duct bottom；
(4) electricity consumption welder I-steel prepares two steel I-beams, two steel I-beams is lifted by crane with loop wheel machine, along cable box culvert
Be longitudinally placed in four grooves that foundation pit side-wall has excavated, make steel I-beam both ends be close to cable box culvert side and parallel to
Cable box culvert is set, and is fixed with I-steel geometrical clamp, steel I-beam is kept vertical；
(5) steel I-beam intensity is checked
The intensity of steel I-beam meets formula：
[σ]2>σ2max
Wherein：[σ]2For the allowable stress of steel I-beam, according to《Code for design of steel structures》In (GB 50017-2014)
Table 3.4.1-1 is obtained；σ2maxThe maximum deflection direct stress being subject to for the steel I-beam after welding, σ2maxDetermined by following formula：
In formula：M2maxFor the maximal bending moment on the steel I-beam after welding, y2For one of the steel I-beam height after welding
Half, Iz1It is the steel I-beam section after welding to its neutral equatorial moment of inertia；
For σ2max<[σ]2, represent that design meets to require；For σ2max>[σ]2, represent that design is unsatisfactory for requiring, then change
Steel I-beam specification, and redesign；
4th step, manually draw except box culvert lower recess soil, and apply I-steel connecting rod；Including：
(1) soil body shape is uniformly drawn out using hand excavation's mode along cable box culvert longitudinal direction in the soil body of cable box culvert bottom
Into groove, the bottom portion of groove before excavating in design pulls on horizontal line retaining groove bottom in same level；
(2) I-steel connecting rod is placed respectively in each groove on two steel I-beams, and electricity consumption welder I-shaped
Steel connecting rod and two steel I-beams, I-steel connecting rod and two I-shapeds are kept to form two complete i-beam frames, during welding
Girder steel is vertical；
(3) intensity of I-steel connecting rod is checked
The intensity of I-steel connecting rod meets formula：
[σ]3>σ3max
Wherein：[σ]3For the allowable stress of I-steel connecting rod, according to《Code for design of steel structures》(GB 50017-2014)
Middle table 3.4.1-1 is obtained；σ3maxFor the maximum deflection direct stress of I-steel connecting rod, σ3maxDetermined by following formula：
In formula：M3maxFor the maximal bending moment on I-steel connecting rod, y3For the half of I-steel connecting rod height；Iz2For I-steel
Connecting rod section is determined to the moment of inertia of its neutral axis by specification hot-rolled steel section (GB/T 706-2008)；
For σ3max<[σ]3, represent that design meets to require, for σ3max>[σ]3, represent that design is unsatisfactory for requiring, then change
I-steel connecting rod specification, and redesign；
5th step, at the both ends of each I-steel connecting rod weld triangle square steel framves with three square steel respectively：
(1) first square steel electricity consumption welder on the edge of a wing of I-steel connecting rod, and reserve apart from cable box culvert 2~
3cm position；
(2) second square steel are welded in first square steel close to one end of cable box culvert vertically, and with cable box culvert distance
Remain 2~3cm；
The both ends of (3) the 3rd square steel are welded in the one end and second of first square steel away from box culvert with electric welding machine respectively
The upper end of root square steel, a triangle is formed with preceding two square steel；
6th step, lifting i-beam frame simultaneously anchor；Including：
(1) I-steel geometrical clamp is shed, with loop wheel machine lifting i-beam frame and cable box culvert bottom gentle touchdown, and makes I-shaped
The triangle steelframe of steel connecting rod two end and the distance of cable box culvert are 2~3cm, then four terminations to i-beam frame and its institute
Gap between the bottom portion of groove soil body is filled with steel building block；
(2) four grooves where four terminations of i-beam frame are set up with the high 100cm of the wide 50cm of long 100cm template, and
Casting concrete anchors；
(3) casting concrete intensity is checked
The casting concrete meets formula in intensity：
[fc] ＞ p
In formula：[fc] it is concrete crushing strength；P is the actual pressure by steel I-beam of concrete, and p is true by following formula
It is fixed：
In formula：G is cable box culvert weight；A is floor space of the steel I-beam in concrete；
For p<[fc], represent that design meets to require；For p>[fc], represent that design is unsatisfactory for requiring, then replacing pours mixed
Solidifying soil species class, and redesign；
7th step, after concrete hardening, manually draw except the soil body between the groove for placing I-steel connecting rod, and in cable box culvert
Lower section and I-steel connecting rod between welded reinforcement mesh sheet, and gunite concrete anchor.
Preferably, in the first step, the related data is the design drawing of cable box culvert, including：Cable box culvert cross section
Figure and size be cable box culvert long L, wide b, high h, type, the density p of cable slab culvert concretec, thickness d and allowable tensile stress
[σ], cable box culvert inner cable line density ρlAnd length L1。
Preferably, in (1) of the first step, the cable box culvert weight G is determined by following formula：
G=ρcg×2[Lbh+(h-2d)d(L+b)]+ρlg×L1
In formula：ρcFor cable box culvert concrete density, L is cable box culvert length, and b is cable box culvert width, and h is cable
Box culvert height, d is cable box culvert concrete thickness, and g is local gravitational acceleration, ρlFor cable box culvert inner cable line density, L1For
Cable box culvert inner cable length.
Preferably, in (2) of the first step：
Maximal bending moment M when the cable box culvert suspends in midair naturallymaxDetermined by following formula：
The moment of inertia I when the cable box culvert suspends in midair naturally is determined by following formula：
Preferably, in (1) of the 3rd step, the excavation cable box culvert soil at both sides slope gradient control is 1:1, excavation
Depth is 74cm below cable box culvert bottom.
Preferably, in (2) of the 3rd step, the width control system of the cable duct is 200cm, and the excavation length of cable duct is base
The width in hole.
Preferably, in (3) of the 3rd step, the size of four grooves is：Height 100cm, width 50cm, depth
100cm。
Preferably, in (4) of the 3rd step, each steel I-beam is by the Q235 unskilled labors that two specifications are I20b
Word steel and the common I-steel of Q235 that two specifications are I18 are welded, during welding two I18 I-steel it is middle, two
I20b I-steel is respectively welded in the upper and lower ends of an I18 I-steel, and ensures two I20b I-steel and two I18 I-shapeds
The web of steel is in welding in same perpendicular；
The length of two I20b I-steel and two I18 I-steel be cable box culvert cross over foundation ditch width+
200cm。
Preferably, in (5) of the 3rd step：
The M2maxDetermined by following formula：
WhereinTherefore,
The Iz1Determined by following formula：
In formula：I18The moment of inertia for I18 I-steel section to its neutral axis, I20bIt is neutral to it for I20b I-steel section
The moment of inertia of axle, I18And I20bDetermined by specification hot-rolled steel section (GB/T 706-2008)；h18For the height of I18 I-steel, h20
For the height of I20b I-steel, A18For the area of I18 I-steel, A20For the area of I20b I-steel.
Preferably, in (1) of the 4th step, each groove interval holding be 100cm, the specification of groove be 20cm ×
20cm, the number of groove are identical with the number of I-steel connecting rod.
Preferably, in (2) of the 4th step, the I-steel connecting rod is specification I10 Q235 I-steel, I-steel connecting rod
Length is the distance between two steel I-beams.
Preferably, in (3) of the 4th step, the M3maxDetermined by following formula：
In formula：G is cable box culvert weight, and n is the number of I-steel connecting rod；L3For the length of I-steel connecting rod；
Therefore：
Preferably, in the 4th step (3), the Iz2For I-steel connecting rod I10 Q235 I-steel section to its neutral axis
The moment of inertia, determined by specification hot-rolled steel section (GB/T 706-2008).
Preferably, in the 5th step, the square steel is length of side 5cm square steel.
Preferably, in (1) of the 5th step, the length of first square steel is I-steel link end to cable box culvert side
The distance of upper 2~3cm positions.
It is highly preferred that in (2) of the 5th step, the length of second square steel is 2/3rds of cable box culvert height.
It is highly preferred that in (3) of the 5th step, the length of the 3rd square steel is first square steel away from cable box culvert
Distance of the termination to second square steel upper end.
Preferably, in (2) of the 6th step, the concrete is C30 slightly expanded concretes.
Preferably, in (3) of the 6th step, the A is determined by following formula：
A=l1×d1
In formula：l1The length in the concrete of both ends, d are embedded in for steel I-beam1It is wide for the leg of steel I-beam.
Preferably, in the 7th step, the reinforced mesh is 12@150mm bar-mat reinforcements.
Preferably, in the 7th step, the concrete is C25 early strength concretes.
The present invention compared with prior art, has the advantages that：
The method of the invention is efficiently solved underground high voltage cable box culvert is embedded with constructing tunnel passage the problem of,
The safety of cable box culvert is more effectively ensure that with the support of I-steel, avoids the relocating work of high-tension cable box culvert, is whole
Individual work progress has saved the duration, improves efficiency of construction, saves removal charge, reduces construction cost, and alleviates pair
The influence of surrounding resident.
Brief description of the drawings
High-tension cable box culvert construction method embodiment under cast-in-place steelframe protecting field is made with reference to the following drawings by reading
Detailed description, other features, objects and advantages of the invention will become more apparent upon：
Fig. 1 is that the cable box culvert of one embodiment of the present invention protects plan；
Fig. 2 is that the cable box culvert of one embodiment of the present invention protects profile；
Fig. 3 is that the cable box culvert of one embodiment of the present invention protects side view；
In figure：
1 is steel I-beam, and 1-1 is I20b I-steel, and 1-2 is I18 I-steel；2 be I10 I-steel connecting rods；3 be triangle
Shape square steel frame, 3-1 are horizontal square steel, and 3-2 is vertical square steel, and 3-3 is hypotenuse square steel；4 be bar-mat reinforcement；5 be cable box culvert；6 are
Foundation pit enclosure stake；7 be excavation slope line of demarcation, and 8 is place the groove of I-steel connecting rod, and 9 be filling C30 slightly expanded concretes
Groove.
Embodiment
With reference to specific embodiment, the present invention is described in detail.Following examples will be helpful to the technology of this area
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill to this area
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the present invention
Protection domain.
By taking the light railways of Chongqing as an example, involved cable box culvert is 110KV high-tension cable box culverts, and cable box culvert is cut
Face size is 1.7m (width) × 1.5m (height), and cable box culvert is 21m across foundation ditch length；Come in and gone out positioned at tunnel on construction passage,
It is imbedded in underground about 1m depths.Fender post a diameter of 70cm, the spacing 210cm for passage both sides arrangement of constructing, and it is located at cable
Box culvert both sides.
To prevent the excavation of construction passage from causing cable box culvert hanging, one kind crosses over base using the protection of cast-in-place concrete support
The plan of the design and construction method of the underground high voltage cable box culvert in hole, profile, side view respectively as shown in Figure 1, Figure 2, Fig. 3 institutes
Show；Methods described specifically includes following steps：
The first step, cable box culvert related data is collected, determine cable box culvert globality
The cable box culvert related data is the size of cable box culvert：Long L is 21m, wide b is 1.7m, high h is 1.5m；
Cable slab culvert concrete is C30 concrete, its antiseepage grade S6, density pcFor 2.38 × 103 kg/m3, according to《Concrete structure
Design specification》The allowable tensile stress [σ] of (GB 50010-2010) cable slab culvert concrete is 1.43N/mm2, thickness d 0.3m；
Cable density p in cable box culvertlIt is 21m for 32.5kg/m, length L；Local gravitational acceleration g takes 9.8N/kg.
(1) according to cable box culvert related data, determine that cable box culvert weight G is：
G=ρcg×2[Lbh+(h-2d)d(L+b)]+ρlg×L1
=2.38 × 103×9.8×2×[21×0.3×1.5+(1.5-2×0.3)×0.3×(21+1.7)]+32.5
×9.8×21
=733417.69N
(2) the maximal bending moment M of pendant cables box culvert is determinedmaxIt is respectively with the moment of inertia I：
(3) the maximum (normal) stress σ during suspention of cable box culvert is determinedmax, and the allowable tensile stress [σ] of the concrete is contrasted, with
Check the globality intensity of cable box culvert：
[σ]=1.43MPa<σmax=10.83MPa, if pendant cables box culvert will necessarily be destroyed, supporting must be shifted to an earlier date.
Second step, surveying setting-out, determine cable box culvert and foundation pit enclosure stake position
(1) according to design drawing, cable box culvert 5 and the profile point coordinates of foundation pit enclosure stake 6 are calculated, from TCR402 whole stations
Instrument carries out Coordinate setting-out to above-mentioned profile point, and is passed through by two people review；
(2) in setting-out, 5 marks are respectively carried out on the both sides contour line of cable box culvert 5, and are pulled on carefully between mark
Line, mark is carried out in four foundation pit enclosure stakes, 6 hearts, be sprinkling upon fine rule and foundation pit enclosure stake 6 by the use of lime is used as sign in the heart.
3rd step, cable box culvert soil at both sides is excavated, preset steel I-beam
(1) using fine rule to away from being indicated at the both sides 50cm of cable box culvert 5 and spilling lime, with P315C excavators away from electricity
Start to be excavated to away from the direction of cable box culvert 5 at the 50cm of cable box culvert 5, the control of excavation slope ratio of slope is 1:1, cutting depth
For 100cm, excavation width 150cm below the bottom of cable box culvert 5；Residue soil to the both sides of cable box culvert 5 close to cable box culvert 5
Body is excavated by the way of hand excavation, forms cable duct；
(2) use manual type, on construction passage foundation ditch side four foundation pit enclosure stakes 6 away from cable box culvert 5 one
Side, one is excavated respectively using cable duct ground the bottom of as, long 100cm, wide 50cm, (groove is used to fill high 100cm groove 9
C30 slightly expanded concretes)；
(3) the steel Q235 of the steel Q235 of 23m length I20b I-steel 1-1 tetra-, 23m length I18 I-steel is prepared
1-2 two, it will be welded to connect respectively between an I20b I-steel 1-1 with an I18 I-steel 1-2, obtain two root beads and connect
Steel I-beam 1；
(4) above-mentioned two steel I-beams 1 being welded are set up in the both sides cable duct of cable box culvert 5 respectively using loop wheel machine
It is 10cm with groove part, apart from cable box culvert 5,100cm in groove is inserted at the both ends of every steel I-beam 1, and makes two
Steel I-beam 1 and cable box culvert 5 are parallel longitudinal；Two steel I-beams 1 are fixed with I-steel geometrical clamp again, and use I-shaped
Steel geometrical clamp keeps two steel I-beams 1 vertical；
(5) steel I-beam intensity is checked
Selected steel I-beam 1 meets below equation in intensity：
[σ]2>σ2max,
In formula：[σ]2For the allowable stress of steel I-beam, determined by the material and thickness of I-steel, according to《Steel construction
Design specification》(GB 50017-2014) table 3.4.1-1, [σ]2Take 205MPa；σ2maxMeet below equation：
In formula：
y2For the half of the steel I-beam height after welding, the I-steel after being welded by I20b I-steel and I18 I-steel
Y in beam2=38cm；
M2maxBy following formula
It is defined as 320870.24Nm；
Iz1Determined by following formula：
Therefore：
[σ]2=205MPa>σ3max=161.85MPa, meets design requirement.
4th step, manually draw except the lower recess soil body, and apply connecting rod
(1) manual type is used, is drawn under cable box culvert 5 except soil body grooving, forming groove 8, (groove is used to place
I-steel connecting rod), its specification is 20cm × 20cm, and the spacing of each groove 8 is 100cm, and the number n for writing down groove 8 is 18；
(2) the I10 I-steel connecting rod 2 that steel are Q235 is put into each groove 8 and is used as connecting rod, I10 I-steel connecting rod 2
Length be 410cm；
(3) I10 I-steel connecting rod 2 and two steel I-beams 1 are welded again, I10 I-steel connecting rod 2 and two when keeping welding
Root steel I-beam 1 is vertical, forms a complete i-beam frame；
(4) I-steel connecting rod strength is checked
Selected I10 I-steel connecting rod 2, which is answered, meets formula in intensity：
[σ]3>σ3max
In formula, [σ]3For the allowable stress of I-steel connecting rod, according to《Code for design of steel structures》(GB 50017-2014),
[σ]3Take 205MPa；σ3maxMeet below equation：
In formula：y3For the half of I-steel connecting rod height, y in I10 I-steel3=5cm；Iz2For I-steel connecting rod section pair
The moment of inertia of its neutral axis, I in I10 I-steelz2=245cm4；M3maxBy following formula：
It is defined as 6790.9Nm；
Therefore：
[σ]3=205MPa>σ3max=138.59MPa, meets design requirement.
5th step, at the both ends of each I-steel connecting rod triangle steelframe respectively is respectively welded with three square steel；Specifically：
(1) square steel that three length of sides are 5cm, respectively length 98cm horizontal square steel 3-1,100cm vertical side are prepared
Steel 3-2,155cm hypotenuse square steel 3-3；
(2) long 98cm horizontal square steel 3-1 is welded on the one end of I10 I-steel connecting rod 2, and keeps itself and cable box culvert 5
Distance be 2cm；Long 100cm vertical square steel 3-2 is welded vertically again in horizontal square steel 3-1 close to the side termination of cable box culvert 5,
And it is 2cm to keep the distance of vertical square steel 3-2 and cable box culvert 5；140cm hypotenuse square steel 3-3 and horizontal square steel 3- is welded again
1st, vertical square steel 3-2 composition triangle square steel frame 3, during welding hypotenuse square steel 3-3 both ends be respectively welded in horizontal square steel 3-1 and
Vertical square steel 3-2 termination.
6th step, lifting i-beam frame simultaneously anchor
(1) I-steel geometrical clamp is unloaded, i-beam frame is lifted using loop wheel machine, makes I10 I-steel connecting rod 2 firm with cable duct bottom
Good contact, and make the triangle square steel frame 3 at the both ends of I10 I-steel connecting rod 2 and the distance of cable box culvert 5 be 2cm, then to I-steel
Filled with steel building block in gap between four terminations of frame 1 and its bottom soil body of groove 9；
(2) long 100cm, wide 50cm, high 100cm template are set up in construction passage foundation ditch side upper groove 9, to I-steel
Four terminations of frame 1 pour C30 slightly expanded concretes and anchored；
(3) concrete strength selected by checking；
The C30 slightly expanded concretes should meet formula in intensity：
[fc] ＞ p,
In formula：[fc] it is C30 slightly expanded concrete compression strength, [fc]=14.3MPa；P is that C30 slightly expanded concretes are real
By the pressure of steel I-beam, the p determines by following formula on border：
In formula：G is that cable box culvert 5 is conducted oneself with dignity；A is floor space of the steel I-beam 1 in C30 slightly expanded concretes, and A is by following formula
It is determined that：
A=l1×d1=100 × 10.2=1020cm2,
In formula：l1The length in the C30 slightly expanded concretes of both ends, l are embedded in for steel I-beam 11=100cm；d1For I-steel
The leg of beam 1 is wide, d1=10.2cm；
Therefore：
Therefore：P=1.79MPa<[fc]=14.3MPa, meets design requirement.
7th step, after concrete hardening, using manual type, draw except the soil body between cable box culvert lower grooves 8, and
12 150mm bar-mat reinforcement 4 is welded between I10 I-steel connecting rod 2 below cable box culvert, and sprays C25 early strength concretes and carries out anchor
Gu.
The method of the invention is efficiently solved underground high voltage cable box culvert is embedded with constructing tunnel passage the problem of,
The safety of cable box culvert is more effectively ensure that with the support of I-steel, avoids the relocating work of high-tension cable box culvert, is whole
Individual work progress has saved the duration, improves efficiency of construction, saves removal charge, reduces construction cost, and alleviates pair
The influence of surrounding resident.
The specific embodiment of the present invention is described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring the substantive content of the present invention.
Claims (10)
1. a kind of protect the design and construction method across the underground high voltage cable box culvert of foundation ditch, it is characterised in that including following step
Suddenly：
The first step, cable box culvert data is collected, determine cable box culvert globality；Including：
(1) according to the data of cable box culvert, cable box culvert weight G is determined；
(2) according to cable box culvert weight G, size and cable box culvert concrete strength, if it is determined that do not apply safeguard measure, cable
Maximal bending moment M when box culvert suspends in midair naturallymaxWith the moment of inertia I；
(3) the maximum (normal) stress σ during suspention of cable box culvert is determinedmax, and the allowable tensile stress [σ] of cable slab culvert concrete is contrasted,
Check the globality intensity of cable box culvert；The σmaxDetermined by following formula：
For [σ]<σmaxIf expression does not apply safeguard measure, cable box culvert is suspended in midair naturally, cable box culvert can be destroyed, electricity
The globality of cable box culvert is bad, it is necessary to carry out supporting in advance；
Second step, surveying and locating, determine cable box culvert and fender post position；
Using total powerstation according to construction drawing, cable box culvert is determined and positioned at foundation ditch both sides, cable box culvert both sides and near electricity
Four fender post positions of cable box culvert, 8~12 points of selection expression contour line carry out mark on the profile of cable box culvert,
Fine rule is pulled between mark, and mark is carried out in fender post center, pulls on fine rule between adjacent two fender post, and along thin
Line is sprinkled with lime on ground；
3rd step, cable box culvert soil at both sides is excavated, preset steel I-beam；Including：
(1) with the cable box culvert soil at both sides in excavator excavation pit apart from more than box culvert 50cm；
(2) the remaining whole soil bodys in excavation pit inner cable box culvert both sides, form cable duct；
(3) four grooves are excavated in foundation pit side-wall, makes four grooves respectively positioned at four fender posts on foundation ditch side away from box culvert one
Side and adjacent fender post, and retaining groove bottom flushes with cable duct bottom；
(4) welding H-bar prepares two steel I-beams, lifts by crane two steel I-beams with loop wheel machine, base is longitudinally placed at along cable box culvert
In four grooves that hole side wall has been excavated, the both ends of steel I-beam is close to cable box culvert side and set parallel to cable box culvert
Put, and be fixed with I-steel geometrical clamp, steel I-beam is kept vertical；
(5) steel I-beam intensity is checked
The intensity of steel I-beam meets formula：
[σ]2>σ2max
Wherein：[σ]2For the allowable stress of steel I-beam, σ2maxThe maximum deflection direct stress being subject to for the steel I-beam after welding,
σ2maxDetermined by following formula：
In formula：M2maxFor the maximal bending moment on the steel I-beam after welding, y2For the half of the steel I-beam height after welding, Iz1
It is the steel I-beam section after welding to its neutral equatorial moment of inertia；
For σ2max<[σ]2, represent that design meets to require；For σ2max>[σ]2, represent that design is unsatisfactory for requiring, then change I-shaped
Girder steel specification, and redesign；
4th step, manually draw except box culvert lower recess soil, and apply I-steel connecting rod；Including：
(1) in the soil body of cable box culvert bottom along cable box culvert longitudinal direction uniformly using hand excavation's mode draw out the soil body formed it is recessed
Groove, the bottom portion of groove before excavating in design pull on horizontal line retaining groove bottom in same level；
(2) I-steel connecting rod is placed respectively in each groove on two steel I-beams, and electricity consumption welder I-steel connects
Bar and two steel I-beams, I-steel connecting rod and two steel I-beams are kept to form two complete i-beam frames, during welding
Vertically；
(3) intensity of I-steel connecting rod is checked
The intensity of I-steel connecting rod meets formula：
[σ]3>σ3max
Wherein：[σ]3For the allowable stress of I-steel connecting rod, σ3maxFor the maximum deflection direct stress of I-steel connecting rod, σ3maxUnder
Formula determines：
In formula：M3maxFor the maximal bending moment on I-steel connecting rod, y3For the half of I-steel connecting rod height；Iz2For I-steel connecting rod
The moment of inertia of the section to its neutral axis；
For σ3max<[σ]3, represent that design meets to require, for σ3max>[σ]3, represent that design is unsatisfactory for requiring, then change I-shaped
Steel connecting rod specification, and redesign；
5th step, at the both ends of each I-steel connecting rod weld triangle square steel framves with three square steel respectively：
(1) first square steel electricity consumption welder is reserved apart from 2~3cm of cable box culvert on the edge of a wing of I-steel connecting rod
Position；
(2) second square steel are welded in first square steel close to one end of cable box culvert vertically, and are kept with cable box culvert distance
For 2~3cm；
The both ends of (3) the 3rd square steel are welded in first square steel one end and second side away from box culvert with electric welding machine respectively
The upper end of steel, a triangle is formed with preceding two square steel；
6th step, lifting i-beam frame simultaneously anchor, including：
(1) I-steel geometrical clamp is shed, with loop wheel machine lifting i-beam frame and cable box culvert bottom gentle touchdown, and connects I-steel
The triangle steelframe at bar both ends and the distance of cable box culvert are 2~3cm, then recessed to four terminations of i-beam frame and its place
Gap between the trench bottom soil body is filled with steel building block；
(2) template matched with the groove size is set up to four grooves where four terminations of i-beam frame, and poured mixed
Solidifying soil anchoring；
(3) casting concrete intensity is checked
The casting concrete meets formula in intensity：
[fc] ＞ p
In formula：[fc] it is concrete crushing strength；P is the actual pressure by steel I-beam of concrete, and p is determined by following formula：
In formula：G is cable box culvert weight；A is floor space of the steel I-beam in concrete；
For p<[fc], represent that design meets to require；For p>[fc], represent that design is unsatisfactory for requiring, then change casting concrete
Species, and redesign；
7th step, after concrete hardening, manually draw except the soil body between the groove for placing I-steel connecting rod, and under cable box culvert
Welded reinforcement mesh sheet between side and I-steel connecting rod, and gunite concrete anchors.
2. a kind of design and construction method for protecting the underground high voltage cable box culvert for crossing over foundation ditch according to claim 1, its
It is characterised by, in the first step, the data is the design drawing of cable box culvert, including：Cable box culvert cross-sectional view and size are
Long L, wide b, the high h of cable box culvert, type, the density p of cable slab culvert concretec, thickness d and allowable tensile stress [σ], cable box
Contain inner cable line density ρlAnd length L1。
3. a kind of design and construction method for protecting the underground high voltage cable box culvert for crossing over foundation ditch according to claim 1, its
It is characterised by that there is one or more of feature：
In (1) of-first step, the cable box culvert weight G is determined by following formula：
G=ρcg×2[Lbh+(h-2d)d(L+b)]+ρlg×L1
In formula：ρcFor cable box culvert concrete density, L is cable box culvert length, and b is cable box culvert width, and h is that cable box culvert is high
Degree, d are cable box culvert concrete thickness, and g is local gravitational acceleration, ρlFor cable box culvert inner cable line density, L1For cable box
Contain inner cable length；
In (2) of-first step：
Maximal bending moment M when the cable box culvert suspends in midair naturallymaxDetermined by following formula：
The moment of inertia I when the cable box culvert suspends in midair naturally is determined by following formula：
4. a kind of design and construction method for protecting the underground high voltage cable box culvert for crossing over foundation ditch according to claim 1, its
It is characterised by that there is one or more of feature：
In (1) of-the three step, the excavation cable box culvert soil at both sides slope gradient control is 1:1, the depth of excavation is cable
74cm below box culvert bottom；
In (2) of-the three step, the width control system of the cable duct is 200cm, and the excavation length of cable duct is the width of foundation ditch；
In (3) of-the three step, the size of four grooves is：Height 100cm, width 50cm, depth 100cm；
In (4) of-the three step, each steel I-beam is by the common I-steel of Q235 that two specifications are I20b and two rule
Lattice are that the I18 common I-steel of Q235 is welded, and two I18 I-steel are in middle, two I20b I-steel difference during welding
The upper and lower ends of an I18 I-steel are welded in, and ensure that the web of two I20b I-steel and two I18 I-steel is welding
When in same perpendicular；The length of two I20b I-steel and two I18 I-steel is the base that cable box culvert is crossed over
Cheat width+200cm.
5. a kind of design and construction method for protecting the underground high voltage cable box culvert for crossing over foundation ditch according to claim 1, its
It is characterised by, in (5) of the 3rd step：
The M2maxDetermined by following formula：
WhereinTherefore,
The Iz1Determined by following formula：
In formula：I18The moment of inertia for I18 I-steel section to its neutral axis, I20bIt is I20b I-steel section to its neutral axis
The moment of inertia；h18For the height of I18 I-steel, h20For the height of I20b I-steel, A18For the area of I18 I-steel, A20For I20b
The area of I-steel.
6. the design and construction of the underground high voltage cable box culvert of foundation ditch are crossed in a kind of protection according to claim any one of 1-5
Method, it is characterised in that there is one or more of feature：
In (1) of-the four step, each groove interval holding is 100cm, and the specification of the groove is 20cm × 20cm, recessed
The number of groove is identical with the number of I-steel connecting rod；
In (2) of-the four step, the I-steel connecting rod is specification I10 Q235 I-steel, and the length of I-steel connecting rod is two
Distance between steel I-beam.
7. the design and construction of the underground high voltage cable box culvert of foundation ditch are crossed in a kind of protection according to claim any one of 1-5
Method, it is characterised in that in (3) of the 4th step, the M3maxDetermined by following formula：
In formula：G is cable box culvert weight, and n is the number of I-steel connecting rod；L3For the length of I-steel connecting rod；
Therefore：
8. the design and construction of the underground high voltage cable box culvert of foundation ditch are crossed in a kind of protection according to claim any one of 1-5
Method, it is characterised in that there is one or more of feature：
In-the five step, the square steel is length of side 5cm square steel；
In (1) of-the five step, the length of first square steel is I-steel link end to 2~3cm positions on cable box culvert side
The distance put；
In (2) of-the five step, the length of second square steel is 2/3rds of cable box culvert height；
In (3) of-the five step, the length of the 3rd square steel is first termination of the square steel away from cable box culvert to second
The distance of square steel upper end.
9. the design and construction of the underground high voltage cable box culvert of foundation ditch are crossed in a kind of protection according to claim any one of 1-5
Method, it is characterised in that there is one or more of feature：
In (2) of-the six step, the concrete is C30 slightly expanded concretes；
In (3) of-the six step, the A is determined by following formula：
A=l1×d1
In formula：l1The length in the concrete of both ends, d are embedded in for steel I-beam1It is wide for the leg of steel I-beam.
10. a kind of protection according to claim any one of 1-5 is applied across the design of the underground high voltage cable box culvert of foundation ditch
Work method, it is characterised in that there is one or more of feature：
In-the seven step, the reinforced mesh is 12@150mm bar-mat reinforcements；
In-the seven step, the concrete is C25 early strength concretes.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114583651A (en) * | 2022-02-28 | 2022-06-03 | 中铁十一局集团有限公司 | Subway station high-voltage cable relocation structure and construction method thereof |
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|---|---|---|---|---|
| JP2009060710A (en) * | 2007-08-31 | 2009-03-19 | Chubu Electric Power Co Inc | Relocation method of underground cable |
| CN104518473A (en) * | 2014-12-31 | 2015-04-15 | 上海市机械施工集团有限公司 | Suspension protection structure and method of cable box culvert pipeline |
| CN104676110A (en) * | 2015-01-22 | 2015-06-03 | 中国地质大学（武汉） | On-site overhanging protection method of high-voltage cable bailey truss under condition of excavation of foundation pit |
| CN105972313A (en) * | 2016-05-30 | 2016-09-28 | 广州地铁设计研究院有限公司 | Overhang method and overhang structure for engineering pipeline stretching across foundation pit |
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2017
- 2017-08-27 CN CN201710746811.XA patent/CN107587528B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009060710A (en) * | 2007-08-31 | 2009-03-19 | Chubu Electric Power Co Inc | Relocation method of underground cable |
| CN104518473A (en) * | 2014-12-31 | 2015-04-15 | 上海市机械施工集团有限公司 | Suspension protection structure and method of cable box culvert pipeline |
| CN104676110A (en) * | 2015-01-22 | 2015-06-03 | 中国地质大学（武汉） | On-site overhanging protection method of high-voltage cable bailey truss under condition of excavation of foundation pit |
| CN105972313A (en) * | 2016-05-30 | 2016-09-28 | 广州地铁设计研究院有限公司 | Overhang method and overhang structure for engineering pipeline stretching across foundation pit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114583651A (en) * | 2022-02-28 | 2022-06-03 | 中铁十一局集团有限公司 | Subway station high-voltage cable relocation structure and construction method thereof |
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