CN108193695A - A kind of enclosure structure of foundation pit of subway station support and construction method - Google Patents
A kind of enclosure structure of foundation pit of subway station support and construction method Download PDFInfo
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- CN108193695A CN108193695A CN201810073855.5A CN201810073855A CN108193695A CN 108193695 A CN108193695 A CN 108193695A CN 201810073855 A CN201810073855 A CN 201810073855A CN 108193695 A CN108193695 A CN 108193695A
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Abstract
A kind of enclosure structure of foundation pit of subway station support and construction method, it is related to construction of underground structure technical field；Diaphram wall has been performed along Metro station excavation surrounding, armored concrete Guan Liang is equipped at the top of diaphram wall, several first of supports are equipped at intervals with along line direction, first of support support top or has been fixed in armored concrete Guan Liang；If being vertically arranged at intervals arterial highway steel pipe support below first of support, per pass steel pipe support is arranged at intervals several steel pipe supports along line direction；Steel pipe support is installed on special steel tube coupling in foundation pit the same side, and special steel tube coupling is bolted with the first pre-embedded steel slab；The both sides and top of the steel pipe are welded to connect steel plate, steel plate garden ring are cased on steel pipe positioned at the both ends of junction steel plate, steel plate garden ring is welded with outer wall of steel pipe.The present invention does not need to apply interim lattice column, lattice column foundation pile and connection beam, economizes on resources, facilitates digging and structure construction.
Description
Technical field
The present invention relates to construction of underground structure technical fields, and in particular to a kind of support of enclosure structure of foundation pit of subway station and
Construction method.
Background technology
The whole nation has a city more than 30 just in Large scale construction subway engineering, and every subway will generally build a subway more than 20
It stands.Subway station is generally string configuration, station width 18m-25m, station length 200m-300m.At present, subway station base
Pit enclosure structure is generally using vertical soil-baffling structure+support, and support is using reinforced concrete support or steel pipe support；For two layers
The Metro station excavation of structure, three supports are generally set when place soil strength is higher, and first of support is generally reinforcing bar and mixes
Solidifying soil support or steel pipe support, second, the support of third road are frequently with steel pipe support.When foundation pit width is smaller (for example,≤20m)
When, interim lattice column and structure stanchion base are not performed among foundation pit；When cheating width larger (for example, ＞ 20m) at once, needed among foundation pit
Perform interim lattice column and structure stanchion base, interim lattice column is along line direction spacing 6m-9m.When subway foundation pit is cut the earth, foundation pit
Shoveling machine operation is arranged at bottom, and lattice column exists and can bring inconvenience to shoveling；For soft clay area, the length needs of lattice column are several
Ten meters of depths.For example, Rail Transit Line 3 Hengshan Mountain, Suzhou way station, standard paragraphs foundation depth 17.9m, the interim lattice column foundation pile of foundation pit
Length 20m, stake diameter 850mm.
Metro station excavation supports stress size mainly with soil response characteristic, level of ground water, support along between line direction
Away from, support spacing vertically and support depth from the ground；The bearing capacity of steel pipe support mainly with the diameter of steel pipe, wall
Thickness, computational length are related.Steel pipe is longer, and steel pipe compression bearing is smaller.Enclosure structure of foundation pit of subway station designs, steel pipe support
3.0m is taken mostly along line direction spacing.When foundation pit is wider, interim lattice column and connection beam are set among foundation pit, be in order to
Apply vertical and horizontal direction to steel pipe in steel pipe centre position to constrain, so as to reduce the computational length of steel pipe support, improve steel
The bearing capacity of pipe support.
A large amount of subway foundation pit building enclosure Force Calculation result statistics shows：(1) first of support stress is smaller, stress
It does not need to set interim lattice column；(2) second and following several roads support stress it is bigger, foundation pit width determines that interim lattice column is set
Whether putting.
Invention content
In view of the defects and deficiencies of the prior art, the present invention intends to provide one kind does not need to apply interim lattice
Column, lattice column foundation pile and connection beam, the enclosure structure of foundation pit of subway station branch for economizing on resources, facilitating digging and structure construction
Support and construction method.
To achieve the above object, the technical solution adopted by the present invention is：A kind of enclosure structure of foundation pit of subway station support, it
Include diaphram wall, armored concrete Guan Liang, first of support, steel pipe support, special steel tube coupling, connecting rod, the first pre-buried steel
Plate, the second pre-embedded steel slab, steel pipe, junction steel plate, oblique connecting rod, steel plate annulus；Underground has been performed along Metro station excavation surrounding
Diaphragm wall, diaphram wall top are equipped with armored concrete Guan Liang, and several first of supports are equipped at intervals with along line direction, the
Support top is supported together or is fixed in armored concrete Guan Liang；If vertically it is arranged at intervals arterial highway steel pipe below first of support
Support, per pass steel pipe support are arranged at intervals several steel pipe supports along line direction；Steel pipe support is installed in foundation pit the same side
Special steel tube coupling, special steel tube coupling are bolted with the first pre-embedded steel slab；The both sides of the steel pipe and top welding connect
Steel plate is connect, steel plate garden ring is cased on steel pipe positioned at the both ends of junction steel plate, steel plate garden ring is welded with outer wall of steel pipe, junction steel plate
One end is welded with steel plate garden ring, the both sides connection of the junction steel plate special steel tube coupling adjacent thereto per the both sides of the different steel pipe joint of Gent
A connecting rod is at least fixedly connected between steel plate；Top junction steel plate and diaphram wall, reinforcing bar per the different steel pipe joint of Gent
Oblique connecting rod is equipped between concrete Guan Liang, top junction steel plate is welded with oblique connecting rod, oblique connecting rod and diaphram wall, steel
The second pre-embedded steel slab welding in reinforced concrete Guan Liang.
Preferably, the special steel tube coupling has identical length, one end of special steel tube coupling is fixing end, another
It holds as connecting pin, the end face of fixing end is equipped with first and blocks steel plate, and the end face of connecting pin is equipped with second and blocks steel plate；Fixing end and
The movable end branch of steel pipe support is withstood on the first pre-embedded steel slab of diaphram wall；Exist along the first closure steel plate surrounding of fixing end
Several nuts are welded on first pre-embedded steel slab, bolt is installed on nut, are connect fixing end with the first pre-embedded steel slab by bolt.
Preferably, described first blocks steel plate and outer wall of steel pipe welding, if being equipped on the inside of the steel pipe of fixing end side
Dry first rectangle strength plate and the second rectangle strength plate, two edge steel pipe axis directions being mutually parallel of the second rectangle strength plate and steel
Inside pipe wall is closely connected and welds, and the another side of the second rectangle strength plate and the first closure steel plate are closely connected；One side of first rectangle strength plate with
Steel pipe inner wall welds, another parallel edges and the second rectangle strength plate weld, and the third side of the first rectangle strength plate is blocked with first
Steel plate is closely connected；It blocks with first on the outside of fixing end one end steel pipe and is equipped with several triangle floors along outer wall of steel pipe between steel plate, three
One right-angle side of angular floor and first blocks steel plate welding, and another right-angle side and the outer wall of steel pipe of triangle floor weld；Even
The steel tube end part for connecing end is equipped with the second closure steel plate, and second blocks steel plate welds with outer wall of steel pipe, and second blocks steel plate and steel pipe
Several triangle floors are equipped between outside, a right-angle side of triangle floor and second block steel plate welding, triangle floor
Another right-angle side and outer wall of steel pipe weld；Second, which blocks steel plate, is equipped with screw hole.
Preferably, the connecting rod uses channel steel or angle steel, connected between connecting rod and junction steel plate using welding or bolt
It connects；When being connected by screw bolts, channel steel or angle steel both ends are equipped with screw hole.
A kind of construction method of enclosure structure of foundation pit of subway station support, it includes the following steps：
1st, it carries out diaphram wall 1 along on the outside of Metro station excavation first to perform, diaphram wall is in steel pipe support position
It is installed on the first pre-embedded steel slab and the second pre-embedded steel slab；
2nd, first layer soil is dug, Guan Liang construction pours or set up first of support；
3rd, processing special steel tube coupling, connecting rod；
4th, second layer soil is dug, sets up second steel pipe support, wherein special steel tube coupling is installed in the side of foundation pit, installs
Connecting rod in second steel pipe support between special steel tube coupling installs special steel tube coupling top connecting plate in second steel pipe support
Oblique connecting rod between diaphram wall or Guan Liang is welded along special steel tube coupling fixed end surrounding on the first pre-embedded steel slab
Several nuts install bolt on nut, are fixed steel pipe support fixed end and the first pre-embedded steel slab by bolt；
5th, third layer soil is dug, sets up third road steel pipe support, the connecting rod between special steel tube coupling in third road steel pipe is installed；
Oblique connecting rod between special steel tube coupling top connecting plate and diaphram wall in third road steel pipe support is installed, along steel pipe support
Fixed end surrounding welds several nuts on the first pre-embedded steel slab, and bolt is installed on nut, is consolidated steel pipe support by bolt
Fixed end head is fixed with the first pre-embedded steel slab；
6th, the 4th layer of soil is dug, carries out concrete cushion successively, underplate concrete is poured and applied；
7th, remove in third road steel pipe support between special steel tube coupling in connecting rod, third road steel pipe support special steel tube coupling with
Oblique connecting rod and third road steel pipe support between diaphram wall；
8th, pouring structure side wall and middle plate；
9th, connecting rod, second steel pipe support and diaphram wall or hat between special steel tube coupling are removed in two steel pipe supports
Oblique connecting rod and second steel pipe support between beam；
10th, pouring structure side wall and top plate remove first of support.
With the above structure, what the present invention generated has the beneficial effect that：A kind of Metro station excavation of the present invention encloses
Protection structure supports and construction method, does not need to apply interim lattice column, lattice column foundation pile and connection beam, economizes on resources, facilitate digging
Native operation and structure construction.
Description of the drawings
Fig. 1 is foundation pit enclosure structure schematic cross section；
Fig. 2 is steel pipe support along line direction partial cutaway schematic；
Fig. 3 is special steel tube coupling schematic diagram；
Fig. 4 is special steel tube coupling 1-1 sectional views；
Fig. 5 is special steel tube coupling 2-2 sectional views；
Fig. 6 is special steel tube coupling 3-3 sectional views；
Fig. 7 is the nodes schematic diagrames such as oblique connecting rod, junction steel plate, steel plate garden ring；
Fig. 8 is the partial cutaway schematic 2 of embodiment 2.
Specific embodiment
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also
To obtain other attached drawings according to these attached drawings.
Referring to such as Fig. 1 --- shown in Fig. 7, present embodiment the technical solution adopted is that：A kind of Metro station excavation
Building enclosure supports, it includes diaphram wall 1, armored concrete Guan Liang 2, first support 3, steel pipe support 4, special steel pipe
Section 5, connecting rod 6, the first pre-embedded steel slab 7, the second pre-embedded steel slab 8, steel pipe 9, junction steel plate 10, oblique connecting rod 11, steel plate annulus 12；
Diaphram wall 1 is performed along Metro station excavation surrounding, 1 top of diaphram wall is equipped with armored concrete Guan Liang 2, along circuit
Direction is equipped at intervals with several first of supports 3, and first of support or is fixed in armored concrete Guan Liang 23 support tops；First
If road support is vertically arranged at intervals arterial highway steel pipe support below, per pass steel pipe support is along line direction interval certain level spacing
Several steel pipe supports 4 are set；Steel pipe support 4 is installed on special steel tube coupling 5, special steel tube coupling 5 and first in foundation pit the same side
Pre-embedded steel slab 7 is bolted；The both sides and top of the steel pipe 9 are welded to connect steel plate 10, positioned at junction steel plate 10
Both ends are cased with steel plate garden ring 12 on steel pipe 9, and steel plate garden ring 12 is welded with 9 outer wall of steel pipe, 10 one end of junction steel plate and steel plate garden
Ring 12 welds, between the both sides junction steel plate per the junction steel plate special steel tube coupling 5 adjacent thereto of the both sides of the different steel pipe joint 5 of Gent
At least it is fixedly connected with a connecting rod 6；Top junction steel plate 10 and diaphram wall 1, reinforced concrete per the different steel pipe joint 5 of Gent
Oblique connecting rod 11 is equipped between native Guan Liang 2, top junction steel plate 10 is welded with oblique connecting rod 11, and oblique connecting rod 11 and underground are continuous
The second pre-embedded steel slab 8 on wall 1, armored concrete Guan Liang 2 welds.
The special steel tube coupling 5 has identical length, and one end of special steel tube coupling is fixing end 51, the other end is company
End 52 is connect, the end face of fixing end 51 is equipped with first and blocks steel plate 53, and the end face of connecting pin 52 is equipped with second and blocks steel plate 56；It is fixed
The movable end branch of end 51 and steel pipe support is withstood on the first pre-embedded steel slab 7 of diaphram wall；It is blocked along the first of fixing end 51
53 surrounding of steel plate welds several nuts on the first pre-embedded steel slab 7, and bolt is installed on nut, by bolt by fixing end and first
Pre-embedded steel slab 7 connects.
Described first blocks steel plate 53 and is welded with 9 outer wall of steel pipe, and 9 inside of steel pipe of fixing end side is equipped with several first
Rectangle strength plate 54 and the second rectangle strength plate 57, two edge steel pipe axis directions being mutually parallel of the second rectangle strength plate 57 and steel
9 inner wall of pipe is closely connected and welds, and the another side of the second rectangle strength plate 57 and the first closure steel plate 53 are closely connected；First rectangle strength plate 54
It is welded on one side with 9 inner wall of steel pipe, another parallel edges is welded with the second rectangle strength plate 57, and the third side of the first rectangle strength plate 57
It is closely connected that steel plate is blocked with first；If it is equipped between 51 one end steel pipe of fixing end, 9 outside and the first closure steel plate 53 along 9 outer wall of steel pipe
Dry triangle floor 55, a right-angle side of triangle floor 55 with first closure steel plate 53 weld, triangle floor 55 it is another
Right-angle side is welded with 9 outer wall of steel pipe；The steel tube end part of connecting pin is equipped with second and blocks steel plate 56, and second blocks steel plate 56 and steel pipe
9 outer walls weld, and second blocks several triangle floors 55 are equipped between steel plate 56 and the outside of steel pipe 9, and the one of triangle floor 55
Right-angle side is welded with the second closure steel plate 56, and another right-angle side and 9 outer wall of steel pipe of triangle floor 55 weld；Second blocks steel
Plate is equipped with screw hole 58.
The connecting rod 6 uses channel steel 61 or angle steel 62, is connected between connecting rod 6 and junction steel plate 10 using welding or bolt
It connects；When being connected by screw bolts, channel steel 61 or 62 both ends of angle steel are equipped with screw hole.
A kind of construction method of enclosure structure of foundation pit of subway station support, includes the following steps：
1st, it carries out diaphram wall 1 along on the outside of Metro station excavation first to perform, diaphram wall is in steel pipe support position
It is installed on the first pre-embedded steel slab 7 and the second pre-embedded steel slab 8；
2nd, first layer soil is dug, Guan Liang 2 is constructed, and pours or set up first of support 3；
3rd, processing special steel tube coupling 5, connecting rod 6；
4th, second layer soil is dug, sets up second steel pipe support, wherein special steel tube coupling is installed in the side of foundation pit, installs
Connecting rod 6 in second steel pipe support between special steel tube coupling is installed in second steel pipe support and is connected at the top of special steel tube coupling
Oblique connecting rod 11 between 1/ Guan Liang 2 of plate and diaphram wall, along special steel tube coupling fixed end surrounding in the first pre-embedded steel slab 7
It is upper to weld several nuts, bolt is installed on nut, is fixed steel pipe support fixing end 51 and the first pre-embedded steel slab 7 by bolt；
5th, third layer soil is dug, sets up third road steel pipe support, the connecting rod between special steel tube coupling in third road steel pipe is installed
6；Oblique connecting rod 11 between special steel tube coupling top connecting plate and diaphram wall 1 in third road steel pipe support is installed, along steel
Pipe support fixed end head surrounding welds several nuts on the first pre-embedded steel slab 7, and bolt is installed on nut, by bolt by steel pipe
Support fixed end 51 is fixed with the first pre-embedded steel slab 7；
6th, the 4th layer of soil is dug, carries out concrete cushion successively, underplate concrete is poured and applied；
7th, special steel tube coupling in connecting rod 6, third road steel pipe support is removed in third road steel pipe support between special steel tube coupling 5
Oblique connecting rod 11 and third road steel pipe support 4 between 5 and diaphram wall；
8th, pouring structure side wall and middle plate；
9th, connecting rod 6, second steel pipe support and diaphram wall 1/ between special steel tube coupling 5 are removed in two steel pipe supports
Oblique connecting rod 11 and second steel pipe support between Guan Liang 2；
10th, pouring structure side wall and top plate remove first of support.
Embodiment 1：
Station platform width 14m, station are double-layer structure, using twin columns twin spans structure.Standard paragraphs foundation pit width 22.9m,
Foundation depth 19.2m.Foundation pit enclosure structure is supported using+three road of diaphram wall, and first of support is reinforced concrete support,
Second, the support of third road are steel pipe support.Interim lattice column is set among foundation pit, is supported along line direction spacing 6m, concrete
Supporting section size is 800mm × 600mm；Centre is equipped with concrete connection beam, and contact beam section size is 500mm × 600mm；
Second, third road steel pipe support bottom are equipped with connection beam.First of concrete support center distance 2.0m from the ground, first
Concrete support center is from second steel pipe support centre distance 6.5m, and second steel pipe support center is from third road steel pipe support
Centre distance 5.5m, third road steel pipe support centre distance bottom of foundation ditch 5.2m.Diameter of steel tube 609mm, thickness of steel pipe 14mm.
Foundation pit enclosure structure using the present invention, the support of+three road of diaphram wall, first of support are armored concrete branch
Support, second, the support of third road are steel pipe support.Interim lattice column, first of reinforced concrete support edge are not set among foundation pit
Line direction spacing 6m, concrete support sectional dimension are 800mm × 600mm；First of concrete support center from the ground away from
From 2.0m, first of concrete support center from second steel pipe support centre distance 6.5m, second steel pipe support center from
Third road steel pipe support centre distance 5.5m, third road steel pipe support centre distance bottom of foundation ditch 5.2m.Diameter of steel tube 609mm,
Thickness of steel pipe 14mm.
Second, third road steel pipe support are installed on special steel tube coupling, special steel tube coupling length (both ends in foundation pit the same side
Length between face) it is 5.0m, one end of special steel tube coupling is fixing end, the other end is connecting pin；The end of fixing end has
One blocks steel plate, there is the second closure steel plate in the end of connecting pin, and the first closure steel plate thickness is 30mm, overall diameter 730mm, the
Two closure steel plate thickness are 20mm, overall diameter 730mm；Fixing end and the movable end branch of steel pipe support withstand on diaphram wall
On first pre-embedded steel slab, the first pre-embedded steel slab thickness is 15mm, and the size of the first pre-embedded steel slab is 800mm × 800mm, and first is pre-
It buries steel plate and is welded with 15 dowels, dowel diameter 16mm, dowel length 500mm, dowel anchor by diaphram wall concrete side
Enter in diaphram wall concrete；After steel pipe supports is waited to install, welded on the first pre-embedded steel slab along the first closure steel plate surrounding
Several nuts install bolt on nut, are connect fixing end with the first pre-embedded steel slab by bolt；Close to connecting pin in steel pipe
Both sides and top are welded to connect steel plate, junction steel plate size 300mm (height) × 450mm (long along steel pipe axis), junction steel plate thickness
Spend 30mm；Steel plate garden ring is cased on steel pipe positioned at the both ends of junction steel plate, steel plate garden ring is outer through 900mm, internal diameter 611mm, steel
Plate garden ring thickness 20mm, by connecting pin steel plate garden ring from connecting end surface distance 200mm；Steel plate garden ring is welded with outer wall of steel pipe,
Junction steel plate both ends are welded respectively with its closely connected steel plate garden ring, per the junction steel plate of the left/right of the different steel pipe joint of Gent and its
A connecting rod has been at least connected with by bolt between the right side of adjacent special steel tube coupling/left side junction steel plate, connecting rod uses channel steel,
Channel cross-section height 240mm, width 90mm；It is equipped between top junction steel plate and diaphram wall per the different steel pipe joint of Gent oblique
To connecting rod, oblique connecting rod uses two angle steel, and angle steel is located at top junction steel plate both sides and one side of angle steel puts down with junction steel plate
Row setting, angle cross section size are 125mm × 125mm × 12mm；The length of oblique connecting rod on second steel pipe support
6700mm, and angle is 45 degree between steel pipe axis, the second corresponding pre-embedded steel slab is located in the ground on diaphragm wall, second
Pre-embedded steel slab center is from second steel pipe support center line distance 5120mm；The angle steel of oblique connecting rod is long on third road steel pipe support
6188mm is spent, and angle is 40 degree between steel pipe axis, the second corresponding pre-embedded steel slab is located in the ground on diaphragm wall；Top
Portion's junction steel plate is welded with oblique connecting rod, and oblique connecting rod is welded with the second pre-embedded steel slab on diaphram wall, the second pre-buried steel
Plate is located at the surface of steel pipe support, the second pre-embedded steel slab center from third road steel pipe support center line distance 4378mm；Second
Pre-embedded steel slab size is 400mm × 400mm × 15mm, and the second pre-embedded steel slab back side is welded with 9 (with diaphram wall contact surface)
Root reinforcing bar, bar diameter 20mm, reinforcing bar length 600mm, reinforcing bar use plug welding with steel plate.
First blocks the outer wall welding of steel plate and steel pipe, by being equipped with several first rectangle strength on the inside of the steel pipe of fixing end side
Plate and the second rectangle strength plate, the size of the first rectangle strength plate is 288mmm × 400mm × 15mm, and the size of the second rectangle strength plate is
578mmm×400mm×15mm；Two sides (length of side 400mm) being mutually parallel of the second rectangle strength plate along steel pipe axis direction with
Steel pipe inner wall is closely connected and welds, and the another side (length of side 578mm) of the second rectangle strength plate and the first closure steel plate are closely connected；First rectangle
It is welded with steel pipe inner wall, in another parallel edges (length of side 400mm) and the second rectangle strength plate on one side (length of side 400mm) of strength plate
Portion is welded and one side (length of side 288mm) of the first rectangle strength plate and the first closure steel plate are closely connected；On the outside of steel pipe steel is blocked with first
Several triangle floors are equipped with along outer wall of steel pipe between plate, floor size is 50mm × 50mm × 12mm；The one of triangle floor
Right-angle side and first blocks steel plate welding, and another right-angle side and the outer wall of steel pipe of triangle floor weld.
Second blocks steel plate welds with outer wall of steel pipe, and several triangular fins are equipped between the second closure steel plate and steel pipe outside
Plate, floor size are 50mm × 50mm × 12mm；One right-angle side of triangle floor and second blocks steel plate welding, triangular fin
Another right-angle side of plate is welded with outer wall of steel pipe；Second closure steel plate upper edge blocks steel plate surrounding and is uniformly provided with 16 screw hole (screw holes
Center is from steel pipe circle center distance 338mm), screwhole diameter 26mm.
It is connected by screw bolts between connecting rod and left/right junction steel plate, channel steel both ends are equipped with screw hole, the length at channel steel both ends
Hole site is corresponding with the screwhole position of junction steel plate, and left/right junction steel plate has 4 screwhole diameters, screwhole diameter 26mm, spiral shell
Hole center spacing 120mm；
The present embodiment, foundation pit width 22.9m, special steel tube coupling length 5.0m, junction steel plate center is with a distance from connecting end surface
500mm, L1=22.9m- (5.0m-0.5m)=18.4m.
Diaphram wall can be regarded as not kinetoplast, oblique connecting rod top is welded with the second pre-embedded steel slab on diaphram wall
It connects, oblique connecting rod bottom end and junction steel plate firm welding, junction steel plate and steel-pipe welding are secured, and oblique connecting rod has along brace axis
There is larger rigidity, the steel pipe of junction steel plate center position can be regarded as vertically fixed point by we；Simultaneously as steel pipe
Connecting rod is equipped between left/right steel pipe, we can also regard the steel pipe of junction steel plate center position along level side as
To fixed point.It is constrained so applying horizontal and vertical direction to steel pipe by oblique connecting rod and connecting rod, so as to reduce the meter of steel pipe
Calculate length.L1=18.4m ＜ 20m, so remaining steel pipe support section (foundation pit width-foundation pit special steel tube coupling length -0.5m) is no
It needs to set vertical lattice column and longitudinal binding beam again.
The Force principle of the enclosure structure of foundation pit of subway station support of the present embodiment, with tower crane column (four angle steel, along perpendicular
Girt to setting spaced apart, with structural wall fixed link) principle it is identical.
Embodiment 2：
Station platform width 14m, station are double-layer structure, using twin columns twin spans structure.Standard paragraphs foundation pit width 22.9m,
Foundation depth 19.2m.Foundation pit enclosure structure is supported using+three road of diaphram wall, and first of support is reinforced concrete support,
Second, the support of third road are steel pipe support.Interim lattice column is set among foundation pit, is supported along line direction spacing 6m, concrete
Supporting section size is 800mm × 600mm；Centre is equipped with concrete connection beam, and contact beam section size is 500mm × 600mm；
Along circuit direction case structure intercolumniation 6m；Second, third road steel pipe support bottom are equipped with connection beam.In first of concrete support
Heart distance 2.0m from the ground, first of concrete support center is from second steel pipe support centre distance 6.5m, second steel pipe
Support center is from third road steel pipe support centre distance 5.5m, third road steel pipe support centre distance bottom of foundation ditch 5.2m.Steel pipe
Diameter 609mm, thickness of steel pipe 14mm.
Referring to attached drawing 8, foundation pit enclosure structure using the present invention, except the setting of oblique connecting rod is different outer, other designs in fact
It is identical to apply example 1.The present embodiment is equipped with oblique company between the top junction steel plate and diaphram wall of the different steel pipe joint of every Gent
Bar, oblique connecting rod use two angle steel, and angle cross section size is 125mm × 125mm × 12mm, and angle steel is located at top junction steel plate
Both sides and angle steel have an angle with top junction steel plate；The second pre-embedded steel slab corresponding with second steel pipe support is located in the ground
On diaphragm wall, the second pre-embedded steel slab center from second steel pipe support centre distance be 5120mm, with third road steel pipe support pair
The second pre-embedded steel slab answered is located in the ground on diaphragm wall, the second pre-embedded steel slab center is with a distance from third road steel pipe support center line
4378mm；Second pre-embedded steel slab is located above the top between two steel pipe supports, angle steel and its left side on the left of the junction steel plate of top
The welding of the second built-in fitting, top junction steel plate right side angle steel and the second built-in fitting of its right side top of top weld；Oblique company
Bar is welded with the second pre-embedded steel slab in diaphram wall/Guan Liang；Second pre-embedded steel slab size is 400mm × 400mm × 15mm,
The steel plate back side is welded with 6 reinforcing bars, bar diameter 20mm, reinforcing bar length 600mm, reinforcing bar and steel (with diaphram wall contact surface)
Plate uses plug welding.Remaining part and connection relation are same as Example 1.
With the above structure, what present embodiment generated has the beneficial effect that：A kind of subway of the present invention
Foundation pit enclosure structure of standing supports and construction method, does not need to apply interim lattice column, lattice column foundation pile and connection beam, saves money
Source facilitates digging and structure construction.
Basic principle of the invention and main feature and advantages of the present invention has been shown and described above.The skill of the industry
Art personnel it should be appreciated that the present invention is not limited to the above embodiments, the above embodiments and description only describe
The principle of the present invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these
Changes and improvements all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and
Its equivalent thereof.
Claims (5)
1. a kind of enclosure structure of foundation pit of subway station support, it is characterised in that：It includes diaphram wall, armored concrete is preced with
Beam, first of support, steel pipe support, special steel tube coupling, connecting rod, the first pre-embedded steel slab, the second pre-embedded steel slab, steel pipe, connection steel
Plate, oblique connecting rod, steel plate annulus；Diaphram wall has been performed along Metro station excavation surrounding, steel is equipped at the top of diaphram wall
Reinforced concrete Guan Liang is equipped at intervals with several first of supports along line direction, first of support support top or is fixed on reinforcing bar and mixes
In solidifying soil Guan Liang；If in first of support vertically interval setting arterial highway steel pipe support below, per pass steel pipe support is along circuit side
To several steel pipe supports of interval setting；Steel pipe support is installed on special steel tube coupling, special steel tube coupling and in foundation pit the same side
One pre-embedded steel slab is bolted；The both sides and top of the steel pipe are welded to connect steel plate, positioned at the both ends of junction steel plate
Steel plate garden ring is cased on steel pipe, steel plate garden ring is welded with outer wall of steel pipe, and junction steel plate one end is welded with steel plate garden ring, per Gent
One is at least fixedly connected between the both sides junction steel plate of the junction steel plate special steel tube coupling adjacent thereto of the both sides of different steel pipe joint
Root connecting rod；Oblique company is equipped between the top junction steel plate of the different steel pipe joint of every Gent and diaphram wall, armored concrete Guan Liang
Bar, top junction steel plate are welded with oblique connecting rod, and oblique connecting rod and second in diaphram wall, armored concrete Guan Liang are pre-buried
Steel plate welds.
2. a kind of construction method of enclosure structure of foundation pit of subway station support, it is characterised in that include the following steps：
(1), it carries out diaphram wall 1 along on the outside of Metro station excavation first to perform, diaphram wall is pacified in steel pipe support position
Equipped with the first pre-embedded steel slab and the second pre-embedded steel slab；
(2), first layer soil is dug, Guan Liang construction pours or set up first of support；
(3), processing special steel tube coupling, connecting rod；
(4), second layer soil is dug, sets up second steel pipe support, wherein special steel tube coupling is installed in the side of foundation pit, installation the
Connecting rod in two steel pipe supports between special steel tube coupling, install second steel pipe support in special steel tube coupling top connecting plate with
Oblique connecting rod between diaphram wall or Guan Liang, if being welded on the first pre-embedded steel slab along special steel tube coupling fixed end surrounding
Dry nut installs bolt on nut, is fixed steel pipe support fixed end and the first pre-embedded steel slab by bolt；
(5), third layer soil is dug, sets up third road steel pipe support, the connecting rod between special steel tube coupling in third road steel pipe is installed；Peace
The oblique connecting rod between special steel tube coupling top connecting plate and diaphram wall in third road steel pipe support is filled, is consolidated along steel pipe support
Fixed end head surrounding welds several nuts on the first pre-embedded steel slab, installs bolt on nut, is fixed steel pipe support by bolt
End is fixed with the first pre-embedded steel slab；
(6), the 4th layer of soil is dug, carries out concrete cushion successively, underplate concrete is poured and applied；
(7), special steel tube coupling and ground in connecting rod, third road steel pipe support are removed in third road steel pipe support between special steel tube coupling
Oblique connecting rod and third road steel pipe support between lower diaphragm wall；
(8), pouring structure side wall and middle plate；
(9), connecting rod, second steel pipe support and diaphram wall or Guan Liang between special steel tube coupling are removed in two steel pipe supports
Between oblique connecting rod and second steel pipe support；
(10), pouring structure side wall and top plate remove first of support.
3. a kind of enclosure structure of foundation pit of subway station support according to claim 1, it is characterised in that：The special steel
Tube coupling has identical length, and one end of special steel tube coupling is fixing end, the other end is connecting pin, and the end face of fixing end is equipped with the
One blocks steel plate, and the end face of connecting pin is equipped with second and blocks steel plate；Fixing end and the movable end branch of steel pipe support withstand on underground company
On first pre-embedded steel slab of continuous wall；Several nuts are welded on the first pre-embedded steel slab along the first closure steel plate surrounding of fixing end,
Bolt is installed on nut, is connect fixing end with the first pre-embedded steel slab by bolt.
4. a kind of enclosure structure of foundation pit of subway station support according to claim 1, it is characterised in that：First envelope
Stifled steel plate is welded with outer wall of steel pipe, and several first rectangle strength plates and the second rectangle strength plate are equipped on the inside of the steel pipe of fixing end side,
The edge steel pipe axis direction that two of second rectangle strength plate are mutually parallel is closely connected with steel pipe inner wall and welds, the second rectangle strength plate
Another side and first block steel plate it is closely connected；One side of first rectangle strength plate and steel pipe inner wall weld, another parallel edges and the
Two rectangle strength plates weld, and the third side of the first rectangle strength plate and the first closure steel plate are closely connected；On the outside of fixing end one end steel pipe with
Several triangle floors are equipped with along outer wall of steel pipe between first closure steel plate, a right-angle side of triangle floor and first block steel
Plate welds, and another right-angle side and the outer wall of steel pipe of triangle floor weld；The steel tube end part of connecting pin is equipped with second and blocks steel plate,
Second blocks steel plate welds with outer wall of steel pipe, and several triangle floors, triangle are equipped between the second closure steel plate and steel pipe outside
One right-angle side of shape floor and second blocks steel plate welding, and another right-angle side and the outer wall of steel pipe of triangle floor weld；Second
It blocks steel plate and is equipped with screw hole.
5. a kind of enclosure structure of foundation pit of subway station support according to claim 1, it is characterised in that：The connecting rod is adopted
With channel steel or angle steel, welding is used between connecting rod and junction steel plate or is bolted；When being connected by screw bolts, channel steel or angle steel
Both ends are equipped with screw hole.
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| CN201810073855.5A CN108193695B (en) | 2018-01-25 | 2018-01-25 | Subway station foundation pit support structure support and construction method |
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| CN201810073855.5A CN108193695B (en) | 2018-01-25 | 2018-01-25 | Subway station foundation pit support structure support and construction method |
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| CN108193695B CN108193695B (en) | 2023-08-08 |
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| CN114775638A (en) * | 2022-05-23 | 2022-07-22 | 中铁上海设计院集团有限公司 | Device for improving steel support stability by utilizing concrete support and construction method thereof |
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| CN108193695B (en) | 2023-08-08 |
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