CN209082512U - Removable bracing members - Google Patents
Removable bracing members Download PDFInfo
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- CN209082512U CN209082512U CN201821519688.4U CN201821519688U CN209082512U CN 209082512 U CN209082512 U CN 209082512U CN 201821519688 U CN201821519688 U CN 201821519688U CN 209082512 U CN209082512 U CN 209082512U
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- support portion
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Abstract
The utility model discloses removable bracing members, it is used for pattern foundation pit supporting structure, and the edge of foundation pit is provided with supporting construction, and several guide rails and N layers of support portion arranged up and down are provided in foundation pit, N >=2, every layer of support portion include one of steel purlin and the bracing members that are connected in the steel purlin；Guide rail is fixed on the inside of supporting construction along the vertical direction, is fixedly installed guide part in steel purlin, locking member is provided on guide part, which can be fixed on guide part on guide rail；When not having prestressing force, under external force, support portion can be moved up and down along guide rail.Due to being provided with guide rail, entire support portion is maintained on guide rail using closure, which can separate with guide rail, after closure is separated with guide rail, can move up and down each support portion.It without being decomposed to support portion, thus can save a large amount of time, improve the construction efficiency of underground main structure.
Description
Technical field
The utility model relates to the support constructions in subterranean excavation digging process, and in particular to a kind of removable bracing members.
Background technique
To guarantee that safety when foundation pit excavation and underground main structure construction, the especially construction of deep basal pit generally need
Supporting construction and multiple tracks support construction are set in foundation pit, to guarantee the safety of construction.Bracing members refer to steel pipe,
The steel such as H profile steel, angle steel are used as support construction, with the stability of enhancement engineering structure, with steel pipe and H profile steel with being in engineering
It is more.Bracing members, which set up and remove speed, can directly excavate lower layer cubic metre of earth fastly, after erection without waiting for intensity, and support
Material is repeatable to be recycled, and to saving project cost, accelerates the duration with significant advantage.Bracing members are in subway, pipe gallery
It is widely used in equal sleeve configurations foundation pit.Deep-foundation pit engineering generally uses multiple tracks to support, the support installation of first road and remove it is more convenient,
Second and bracing members below are installed and remove more troublesome due to being influenced by supporting above, thus reduce foundation pit
Excavation progress and underground main structure construction efficiency.
Utility model content
A kind of in order to solve the above problems, the utility model proposes removable bracing members, which, which has, is easy to position,
And the advantage that operating process is shorter, specific technical solution are as follows:
Removable bracing members, are used for pattern foundation pit supporting structure, the edge of foundation pit are provided with supporting construction, is provided in foundation pit
Several guide rails and N layers of support portion arranged up and down, N >=2, every layer of support portion include one of steel purlin and are connected to the steel purlin
On bracing members；Guide rail is fixed on the inside of supporting construction along the vertical direction, is fixedly installed guide part in steel purlin,
Locking member is provided on guide part, which can be fixed on guide part on guide rail；
After applying prestressing force to bracing members, the bracing members are by the steel purlin tight abutment connected in supporting construction；
When not having prestressing force, under external force, support portion can be moved up and down along guide rail；
When support portion is moved up and down along guide rail, locking member is in the state separated with guide rail.
In this application, it is provided with guide rail, entire support portion is maintained on guide rail using closure, which can be with
It is separated with guide rail, after closure is separated with guide rail, each support portion can be moved up and down.Therefore it can be excavated on a large scale in foundation pit
Before, the topsoil of foundation pit is cut out first, is then all locked together in each support portion on guide rail, then as the excavation of foundation pit,
Each support portion is gradually dropped into its setting position along guide rail.Since each support portion has been previously-completed assembling, an entirety is formed,
Foundation pit excavate during, it is only necessary to support portion is moved down along guide rail, eliminate in foundation pit to support portion into
The time of row assembling, it thus can effectively improve the construction speed of foundation pit.It, can will be each in the main body structure construction procedure of underground
Support portion integrally moves up, and without decomposing to support portion, thus can save a large amount of time, improves applying for underground main structure
Work efficiency rate disposably removes each support portion through needing the final stage in construction.
Specifically, interconnecting piece is formed at the top of guide rail, the interconnecting piece of guide rail is fixedly connected in supporting construction, guide rail
Lower end surface extends down into the lower section of the bottom surface of foundation pit；In space between interconnecting piece and the bottom surface of foundation pit, in guide rail and branch
Through slot is formed between protection structure；It is provided with pilot hole along the vertical direction in steel purlin, steel purlin is arranged through the pilot hole
On guide rail.
Preferably, the distance between the lower end surface of guide rail and the bottom surface of foundation pit >=0.5 meter.
After through slot is set, it is set in steel purlin on guide rail, without being arranged in steel purlin for clamping guide rail
Groove, when applying prestressing force to bracing members, can make steel purlin close to keep the contour structures of steel purlin to the maximum extent
Ground is resisted against in supporting construction, guarantees that supporting construction being capable of the more equably support force by steel purlin.
Further, the guide rail at least has two raised lines extended along the vertical direction, and it is convex that the locking member is locked together in this
On item.
After raised line is arranged along the vertical direction, which not only can be used as the impetus of locking member, also have certain lead
To function, when support portion can be more steady when moving up and down.
Specifically, the cross section of the guide rail is H-shaped, which has web and the opposite two sides of web are arranged in
The edge of a wing, the edge of a wing is perpendicular to web；The edge of a wing is formed as above-mentioned raised line；
The guide part has the guide way at the edge for the pilot hole that steel purlin is arranged in, and is provided with and leads on the guide way
To slot, at least one edge of a wing of the guide rail is extend into the guide groove；The screw thread of connection guide groove is provided on guide way
Through-hole is screwed with fixing bolt in tapped through hole inward turning, which fixes the above-mentioned edge of a wing extending into guide groove, makes to lead
It is fixed on guide rail to portion；The fixing bolt is formed as above-mentioned locking member.
The section of H-shaped can make raised line there are four guide rail tools, and H-shaped section bending resistance with higher, be especially suitable for
It is used in deep basal pit as guide rail.The cooperation of guide groove and the edge of a wing not only can use installation of the guide groove as locking member
Component can also provide guiding role for the movement of guide rail.
In one embodiment, the guide part includes the guide cylinder being fixed in steel purlin, and the guide cylinder is along the vertical direction
Extend, the guide cylinder is set on guide rail, and the screw fastening of through hole shape is at least offered in the opposite sides of the side wall of guide cylinder
Tieholen is screwed with clamping screw in screw-threaded coupling through-hole inward turning, which is fixed on guide part on guide rail；The locking screw
Bolt is formed as above-mentioned locking member.Using the form of guide cylinder, the guide rail of more structures can be practically applicable to, using setting in guide cylinder
On clamping screw, support portion can be made to be locked on guide rail.
Preferably, the steel purlin is made of H profile steel, and the web of H profile steel is horizontally disposed；The both ends of the bracing members
It is resisted against on the medial surface of steel purlin, is provided between the end face of bracing members and the medial surface of steel purlin and compresses plate, this is compressed
Plate includes main board and the hook portion that is formed on main board, this compresses plate and hangs in steel purlin through the hook portion.According to not
Same geological condition and specific material, steel purlin can be made of H profile steel, can specifically use single H profile steel or two
Root H profile steel Two bors d's oeuveres.
After setting compresses plate between bracing members and steel purlin, bracing members are connected in steel purlin by compressing plate, in reality
In the work progress on border, the installation of bracing members or steel purlin always has certain error, the directly setting installation in steel purlin
Kong Shi, will lead between angle and set angle between bracing members and steel purlin has certain error, this error will affect
To the prestress application of bracing members.After setting compresses plate, plate is compressed as the installation transition piece between bracing members and steel purlin, is supported
Pressing plate is hung in steel purlin, and bracing members can be hung over bolt void and be compressed on plate, i.e., bolt does not fasten, and bracing members only make to loosen
Ground connection compresses on plate, does not influence the prestressed application to bracing members, after completing prestressed application, then to corresponding spiral shell
Bolt is fastened, and the connection of bracing members and steel purlin is completed.Using plate is compressed, its position can be freely adjusted, can be improved
The installation accuracy of bracing members.
Further, it is provided with column in foundation pit, offers guide hole on an at least bracing members, the bracing members are through being somebody's turn to do
Guide hole is set on column., not only can be using column as guide rod after bracing members are set on column, this can be vertical
Detachable bracket is set on column, for supporting bracing members.
The construction method of above-mentioned each removable bracing members technical solution, the construction method specifically comprise the following steps:
(1) along surrounding's construction supporting structure of foundation pit to be excavated, and in the inside sinking guide rail of foundation pit supporting construction；
(2) earthwork is excavated in foundation pit region suspend the excavation of the earthwork until the mounting height of first layer support portion, according to
The distributing order of each support portion installs all steel purlins and corresponding bracing members in the inside of supporting construction, and locking member is sealed
On guide rail, prestressing force then is applied to the bracing members of first layer support portion, the steel purlin of first layer support portion is made to be resisted against branch
On the medial surface of protection structure, the construction of first layer support portion is completed；
(3) continue the excavation earthwork and again pause for the excavation of the earthwork until the mounting height of second layer support portion, release removes
The locking member on support portion other than first layer support portion makes all support portions in addition to first layer support portion under guide rail
Second layer support portion is dropped to it and sets mounting height by drop, then will be on all support portions in addition to first layer support portion
Locking member be locked on guide rail, prestressing force is applied to the bracing members of second layer support portion, supports the steel purlin of the second support portion
It leans against on the medial surface of supporting construction, completes the construction of second layer support portion；
(4) when support portion is more than two layers, the excavation of installation and the earthwork of remaining support portion is completed according to step (3)；
(5) after the excavation for completing foundation pit, the construction of underground main structure is carried out.
The construction method has been fully demonstrated using removable bracing members as the excellent of the support system during foundation pit construction
Gesture.In the work progress of foundation pit, the supporting construction and guide rail of foundation pit complete construction first before excavation of foundation pit, in order to base
The excavation in hole and the installation of each support portion carry out shallow-layer excavation to foundation pit first, in order to each support before support portion installation
The installation in portion, the shallow-layer due to only having carried out foundation pit excavate, and the assembling due to disposably to complete all support portions, and by this
A little support portions are set up onto guide rail, therefore installation can be opened up from undermost support portion, and due to the excavating depth of foundation pit compared with
Shallowly, the operation of various mechanical works is more convenient, can relatively rapid complete the assembling and erection of each support portion, reduces foundation pit
The overall time of construction.
After the excavation for completing foundation pit, into the construction stage of underground main structure, at this stage, with underground main body knot
The progress of structure construction, support portion can be moved up successively, finally concentrate disassembly, in this application, the construction of underground main structure from
Under supreme construction, according to the different numbers of plies of support portion, respectively to have two layers support and be more than Multi-layer supporting portion the case where into
Row description.
As N=2, i.e., when the quantity of support portion is two layers, support portion is successively removed according to following step:
(6A) when the dismounting operating condition of underground main structure construction to second layer support portion, pause underground main structure is applied
Work sheds the prestressing force of the bracing members of second layer support portion；The locking member on second layer support portion is unclamped, then by second layer branch
The steel purlin and bracing members of support part are moved upwards up to the downside of first layer support portion, then lock the locking member of second layer support portion
It closes on guide rail；
(6B) continues main structure under construction ground and again pauses for ground when meeting the dismounting operating condition of first layer support portion
The construction of lower main structure sheds the prestressing force of the bracing members of first layer support portion, unclamps the locking member on first layer support portion,
Remove the bracing members and steel purlin of first layer support portion；The locking member on second layer support portion is unclamped, second layer support portion is removed
Bracing members and steel purlin；
As N > 2, support portion is successively removed according to following step:
(7A) suspends underground main structure when underground main structure construction is to the dismounting operating condition for meeting n-th layer support portion
Construction, shed the prestressing force of the bracing members of n-th layer support portion, the locking member on n-th layer support portion unclamped, then by n-th layer
The steel purlin and bracing members of support portion are moved upwards up to the downside of N-1 layers of support portion, then by the locking member of n-th layer support portion
It is locked on guide rail；
(7B) continues main structure under construction ground, when meeting the dismounting operating condition of N-1 layers of support portion, again pauses for ground
The construction of lower main structure sheds the prestressing force of the bracing members of N-1 layers of support portion, unclamps on n-th layer and N-1 layers of support portion
Locking member, the steel purlin and bracing members of n-th layer and N-1 layers of support portion are moved upwards up to the downside of N-2 layers of support portion,
Then the locking member of n-th layer and N-1 layers of support portion is locked on guide rail；
(8B) continues the movement of main structure and bracing members under construction ground according to step (7B), straight that underground main structure is caused to apply
When work to the dismounting operating condition for meeting first layer support portion, the steel purlin and bracing members of first layer support portion are successively removed, and by suitable
Sequence successively removes the bracing members and steel purlin of each layer support portion.
In underground during main structure construction, with the continuous lasting rising of underground main structure construction height, land
The continuous prestressing force removal by bracing members, then moves up support portion, to expand construction area, while keeping not completing construction area
Interior support portion is in effective holding state of foundation pit, when underground main structure construction is to structural floor, reaches first layer
When supporting removal operating condition, each support portion is concentrated and is removed, removed due to being concentrated to each support portion, each detaching equipment is primary in completion
After positioning, it can be completed in the roughly the same region of all support portions and work, avoid when repeatedly being dismantled to support, disassembly
Equipment needs efficiency caused by multiple bearing to reduce.Using the application, the effect of each support portion during installation not only can be improved
Rate can also improve efficiency when its disassembly.
Detailed description of the invention
Fig. 1 is the partial structure diagram that an embodiment of bracing members is moved in the utility model.
Fig. 2 is the enlarged drawing of part A in Fig. 1.
Fig. 3 is the structural schematic diagram of leading truck.
Fig. 4 is the structural schematic diagram for compressing plate.
Fig. 5 is the installation for completing first layer support portion, and second layer support portion and third layer support portion are locked together in track
Schematic diagram after upper.
Fig. 6 be complete second layer support portion installation, and by third layer support portion it is sealed in orbit after schematic diagram.
Fig. 7 is the schematic diagram after the installation of completion third layer support portion.
Fig. 8 is to complete the schematic diagram after foundation pit excavates.
Fig. 9 is the schematic diagram completed after bed course and construction of bottom plates.
Figure 10 is the schematic diagram completed after the main structure of third layer support portion section below underground.
Figure 11 is the schematic diagram after the bracing members for removing third layer support portion.
Figure 12 is the schematic diagram after the bracing members for removing second layer support portion.
Figure 13 is will be by underground main structure construction to schematic diagram when closing on first layer support portion.
Figure 14 is the schematic diagram completed after the main structure of underground.
Specific embodiment
In this application, inside will be known as towards the direction on the inside of foundation pit, the direction opposite with the inside is known as outside.?
In attached drawing, label 100 indicates ground.
Removable bracing members are illustrated first below.
It is used for pattern foundation pit supporting structure, the edge of foundation pit is provided with supporting construction with Fig. 2, removable bracing members refering to fig. 1
10, which is formed by the combined steel plate pile being mutually twisted, the combined steel plate pile include U-shaped steel sheet pile 11 and against
H profile steel stake 13 in the outside of U-shaped steel sheet pile 11 is welded with two notches on the outside of the web of U-shaped steel sheet pile 11 and sets relatively
One side wing edge of the channel steel 12 set, H profile steel stake 13 is held in the groove of channel steel 12, claims H profile steel stake 13 and U-shaped steel sheet pile 11
For an entirety, combined steel plate pile is formed.
It is provided with several guide rails 20 and three layers of support portion arranged up and down in foundation pit, is shown in Fig. 1 close to upper
Three layers of support portion for convenience of description, are referred to as first layer from the top down please refer to Fig. 8 by two layers of support portion of side
Support portion 30, second layer support portion 60 and third layer support portion 70.
First layer support portion 30 includes one of steel purlin 31 and the bracing members 32 being connected on the steel purlin medial surface.Steel encloses
Purlin 31 is made of the first H profile steel, and the first web 313 of the first H profile steel is horizontally disposed.Guide rail 20 is fixed on along the vertical direction
The cross section of the inside of supporting construction 10, guide rail 20 is H-shaped, which has the second web 24 and be arranged in the second web 24
Opposite two sides second edge of a wing 25, second edge of a wing 25 is perpendicular to the second web 24.
Specifically in the present embodiment, steel purlin is used and is made by single H profile steel, it will be understood that in other embodiments
In, steel purlin can also use Two bors d's oeuveres H profile steel.Bracing members specifically use H profile steel to make, and in other embodiments, bracing members are also
It can be made of steel pipe.
Specifically in the present embodiment, guide rail 20 is made of H profile steel.It is appreciated that in other embodiments, guide rail may be used also
To be formed using steel plate splicing.
In the present embodiment, connection bolt 22 is the bolt hole being screwed on second edge of a wing towards outside of guide rail 20
It is interior, and it is resisted against the end for the screw rod for connecting bolt on the medial surface of U-shaped steel sheet pile.It is appreciated that in other embodiments,
The cushion block of setting thickness can be set between guide rail 20 and U-shaped steel sheet pile 11, and threaded hole is set on U-shaped steel sheet pile, so
It is screwed on the threaded hole after connection bolt is passed through second edge of a wing afterwards, so that guide rail 20 is fixed on U-shaped steel sheet pile.
Above-mentioned threaded hole can be both arranged by the way of opening up tapped through hole on U-shaped steel sheet pile, can also use
The mode of welded nut or internally threaded sleeve is formed on steel sheet pile.
U-shaped steel sheet pile is arranged in towards on the web of foundation pit interior direction in guide rail 20, and a side wing edge of guide rail 20 is parallel to U
The web of shaped steel plate pile.Interconnecting piece 21 is formed on the top of guide rail 20, and interconnecting piece 21 is fixedly connected on U-shaped steel plate through connecting bolt 22
On the web of stake, the lower end surface of guide rail 20 extends down into the lower section of the bottom surface of foundation pit；Please refer to Fig. 8, in interconnecting piece 21
Through slot 26 is formed in space between the bottom surface 80 of foundation pit, between guide rail 20 and supporting construction 10.In steel purlin 31
On be provided with pilot hole 311 along the vertical direction, steel purlin 31 is set on guide rail 20 through the pilot hole 311.
In the present embodiment, pilot hole 311 is provided on the web 313 of the first H profile steel, the inside edge of a wing of the first H profile steel
312 and outer side wing edge 314 be located inside and outside guide rail 20, i.e., inside the edge of a wing 312 pass through above-mentioned through slot 26, make in
Side wing edge 312 keeps integrality to carry out prestressed application to bracing members 32 following to guarantee the integral strength of steel purlin
In the process, the deformation of steel purlin can be reduced to the maximum extent.
Guide part is fixedly installed in steel purlin 31, in the present embodiment, guide part includes that steel purlin 31 is respectively set
Two sides up and down leading truck 40.Referring to Fig. 3, the leading truck 40 includes bottom plate 41, offers on bottom plate 41 and worn for guide rail
The guide rail hole 48 crossed is each provided with a guide way 42 in the opposite sides of guide rail hole 48, a guiding is offered on guide way 42
The opening of slot 43, the guide groove 43 of two guide ways is oppositely arranged, and it is logical that the first screw thread is offered on the side cell wall of guide groove
Hole 44 offers the second tapped through hole 45 on the cell wall of the other side.The first fixing bolt is screwed in 44 inward turning of the first tapped through hole
47, it is screwed with the second fixing bolt 49 in 45 inward turning of the second tapped through hole, is provided between the top and bottom plate 41 of guide way 42
Stiffening plate 46.
The bottom plate 41 of leading truck 40 is welded on two edges of a wing of steel purlin 31, and guide rail hole 48 is made to be set in guide rail 20
On.The two sides on second edge of a wing 25 towards outside of guide rail 20 are respectively protruding into a guide groove 43, screw the first fixed spiral shell
Bolt 47 and the second fixing bolt 49 will be fixed in guide groove 43 towards second edge of a wing 25 in outside, to keep steel purlin 31 fixed
On guide rail 20.
It is appreciated that in other embodiments, it can be by the wider of the width of guide groove setting, so that two of guide rail 20
Second edge of a wing can be extend into guide groove simultaneously.Or 4 guide grooves facing each other of setting, make two second edge of a wing difference
It extend into two opposite guide grooves.One guide groove can certainly be only set.
In the present embodiment, leading truck has stiffening plate 46, it will be understood that in other embodiments, when guide way and bottom
When there are enough bonding strengths between plate, which can be cancelled.It is appreciated that in other embodiments, Ke Yiqu
Guide way 42, is directly welded in steel purlin 31 by the stiffening plate that disappears 46 and bottom plate 41；Or a guide way is only set, i.e., only have
There is a guide groove.
That is, guide part has the guide way at the edge for the pilot hole that steel purlin is arranged in, it is provided with and leads on the guide way
To slot, at least one edge of a wing of the guide rail is extend into the guide groove；The screw thread of connection guide groove is provided on guide way
Through-hole is screwed with fixing bolt in tapped through hole inward turning, which fixes the above-mentioned edge of a wing extending into guide groove, makes to lead
It is fixed on guide rail to portion.First fixing bolt and the second fixing bolt are collectively referred to as fixing bolt in this application, are also
Locking member.
Guide rail is made of H profile steel in the present embodiment, H profile steel tool there are two the edge of a wing that is parallel to each other, the edge of a wing it is any
Side can be regarded as the raised line extended along the vertical direction, which extend into guide groove, it will be understood that
In other embodiments, the cross section of guide rail can be other shapes, it is only necessary to be provided at least two raised lines.
The structure of second support portion 60 and third support portion 70 is identical as the structure of the first support portion 30.
After applying prestressing force to bracing members, the bracing members are by 31 tight abutment of steel purlin connected in supporting construction 10
On；When not having prestressing force, under external force, support portion can be moved up and down along guide rail；It is moved down along guide rail in support portion
When dynamic, locking member is in the state separated with guide rail.
In the present embodiment, the distance between the lower end surface of guide rail and the bottom surface of foundation pit F are 0.5 meter.By the lower end of guide rail
It is to make the lower end of guide rail be capable of forming relatively-stationary state that face, which extend into the bottom surface of foundation pit or less, it will be understood that at it
In its embodiment, distance F can be greater than 0.5 meter.
For convenient for loading and unloading bracing members, the both ends of bracing members 32 are resisted against on the medial surface of steel purlin, at the end of bracing members 32
It is provided between face and the medial surface of steel purlin 31 and compresses plate 50, referring to Fig. 4, compressing plate 50 includes main board 51, in main body
The opposite two sides of plate 51 respectively form a hook portion 52, have a groove 53 between hook portion 52 and main board 51, in main board
The first fixation hole 54 is offered on 51, and the second fixation hole 55 is offered in hook portion.
Wherein the second fixation hole 55 will be for that will compress the inside edge of a wing 312 that plate 50 is fixed on the first H profile steel.It is supported in installation
When pressing plate 50, the two sides on the inside edge of a wing 312 of the first H profile steel are set in two hook grooves 53 for compressing plate 50, then along the first H
Mobile this of the length direction of fashioned iron compresses plate, sets top position until reaching it, and it is fixed then will to compress plate 50 with hold-down bolt 56
In steel purlin 31.
First fixation hole 54 is for connecting bracing members 32.It is welded with end plate 33 at the both ends of bracing members 32, in completion pair
After bracing members complete positioning and prestress application, carrying bolt 34 is screwed in the first of pressure plate 50 after end plate 33 and is consolidated
Determine in hole 54, bracing members 32 are connected in steel purlin 31.
In the present embodiment, it is provided with column 300 in foundation pit, guide hole 38, bracing members are offered on bracing members 32
32 are set in 300 on column through the guide hole 38.When support portion moves up and down, column 300 can play guiding role.At this
In embodiment, all columns both pass through bracing members.It is appreciated that in other embodiments, can only have part column and pass through
Bracing members, or an only root post pass through bracing members.That is, offering guide hole on an at least bracing members, bracing members are through being somebody's turn to do
Guide hole is set on column.
In the present embodiment, steel purlin is fixed on guide rail using raised line and guide groove mutually matched structure,
It is understood that in other embodiments, guide part can also be set to the structure with guide cylinder, which is fixed on steel
In purlin, and extend along the vertical direction, which is set on guide rail, then opens up in the opposite sides of the side wall of guide cylinder
There is the screw fastening tieholen of through hole shape, is then screwed with clamping screw in screw-threaded coupling through-hole inward turning, which consolidates guide part
It is scheduled on guide rail；The clamping screw is formed as locking member.
When using guide cylinder, guide rail can be made of the material of multiple structural forms, for example, round steel pipe, square tube,
And concrete stake or timber can be used as guide rail.
In the present embodiment, supporting construction uses combined steel plate pile, it is possible to understand that in other embodiments, supporting construction is also
The steel sheet pile of Soil-cement pile water stopping curtain, the stake of SMW engineering method, diaphram wall or other forms can be added by bored concrete pile, with
And the pile bodies such as combined steel plate pile or combined steel pipe stake are constituted.
Illustrate the construction methods of removable bracing members below, specifically by taking the construction of above-mentioned removable bracing members as an example,
The construction method specifically comprises the following steps:
(1) referring to Fig. 5, along foundation pit to be excavated surrounding's construction supporting structure 10, and in foundation pit supporting construction 10
Inside sinking guide rail 20.
(2) please continue to refer to Fig. 5, the earthwork is excavated in foundation pit region, until the mounting height of first layer support portion 30, pause
The excavation of the earthwork, installs all steel purlin and corresponding steel branch in the inside of supporting construction according to the distributing order of each support portion
Support, locking member is locked together on guide rail, is then applied prestressing force to the bracing members of first layer support portion, is made first layer support portion
Steel purlin is resisted against on the medial surface of supporting construction, completes the construction of first layer support portion.
After all steel purlins are set on guide rail 20, please refer to Fig. 1, connection bolt 22 is passed through into guide rail 20
After be connected on U-shaped steel sheet pile, the upper end of guide rail 20 is fixed.
In the present embodiment, first layer support portion 30 is located at top layer, is successively second layer support portion 60 and third down
Layer support portion 70.
(3) earthwork is again paused for until the mounting height of second layer support portion 60 referring to Fig. 6, continuing the excavation earthwork
It excavates, unclamps the locking member on second layer support portion 60 and third layer support portion 70, make second layer support portion 60 and third layer branch
Support part 70 declines along guide rail, and second layer support portion 60 is dropped to it and sets mounting height, then by 60 He of second layer support portion
Locking member on third layer support portion 70 is locked on guide rail, is applied prestressing force to the bracing members of second layer support portion, is made second
The steel purlin of layer support portion is resisted against on the medial surface of supporting construction, completes the construction of second layer support portion.
That is, unclamping the locking member on the support portion in addition to first layer support portion, make the institute in addition to first layer support portion
Have support portion along guide rail decline, by second layer support portion drop to its set mounting height, then will except first layer support portion with
Locking member on outer all support portions is locked on guide rail, is applied prestressing force to the bracing members of second layer support portion, is made second
The steel purlin of support portion is resisted against on the medial surface of supporting construction, completes the construction of second layer support portion.
(4) soil is then again paused for until the construction elevation of third layer support portion 70 referring to Fig. 7, continuing the excavation earthwork
The excavation of side unclamps the locking member on third layer support portion 70, third layer support portion 70 is made to drop to its setting height along guide rail
And be locked on guide rail, the bracing members of third layer support portion are applied and prestressing force, make the steel purlin of third layer support portion against
On the medial surface of supporting construction, the construction of third layer support portion is completed.
(5) Fig. 8 and Fig. 9 are please referred to, the excavation of the earthwork in foundation pit and completion are continued.Then it is laid on the bottom surface of foundation pit 80
Bed course 84 and bottom board 82 carry out the construction of underground main structure.
It when carrying out the construction of main structure, constructs from bottom to up, in the construction process, removes and support according to following step
Portion:
(7A) please refers to Figure 10 and Figure 11, when the construction of underground main structure 90 to the dismounting work for meeting third layer support portion 70
When condition, suspend the construction of underground main structure 90, shed the prestressing force of the bracing members of third layer support portion 70, unclamps third layer branch
Then the steel purlin and bracing members of third layer support portion are moved upwards up under second layer support portion by the locking member on support part
Then the locking member of third layer support portion is locked on guide rail by side.
Main structure of constructing upwards is then proceeded to, Figure 11 is shown, complete after moving up the steel purlin of third layer support portion
Second layer collar tie beam 91 is provided at the construction of second layer intermediate plate 92, and in the periphery of intermediate plate 92.
(7B) please refers to Figure 12 and Figure 13, continues dismounting of the main structure until meeting second layer support portion 60 under construction ground
When operating condition, the construction of underground main structure is again paused for, sheds the prestressing force of the bracing members of second layer support portion；Unclamp third layer
With the locking member on second layer support portion, the steel purlin and bracing members of third layer and second layer support portion are moved upwards up to first
The locking member of third layer and second layer support portion, is then locked on guide rail by the downside of layer support portion.
In Figure 13, the construction of first layer intermediate plate 94 is completed, and the periphery of intermediate plate 94 is provided with first layer
Collar tie beam 93.
(8B) please refers to Figure 14, continues the movement of main structure and bracing members under construction ground according to step (7B), completes the
The dismounting of one layer of support portion 30, and complete the dismounting of the second support portion 60 and third support portion 70.
It is shown in Figure 14, the dismounting of whole support portions and the construction of underground main structure, underground main body knot has been completed
Structure is provided with top plate 96, and top ring beam 95 is provided with around top plate 96.
In the present embodiment, the construction for the removable bracing members for being provided with three layers of support portion is illustrated, Ke Yili
Solution, when support portion is provided only with two layers, above-mentioned steps (8B) are cancelled.
Alternatively, when removable bracing members are provided with the support portion more than three layers, it is only necessary to according to above-mentioned step (7B)
Repeat.
In the present embodiment, Fig. 1 and Fig. 2 are please referred to, is provided with bracket 322 in the two sides of the horizontal direction of bracing members,
When applying prestressing force to bracing members 32, jack 400 is arranged between steel purlin 31 and bracket 322, in Fig. 2, through in steel branch
The side of support illustratively shows a jack, in actually applied prestressing force, needs while to pacify in the two sides of bracing members
Fill jack.During applying prestressed to bracing members, closely filled in the gap between bracing members and steel purlin
Backing plate 35, after prestressed application reaches setting value, carrying bolt 34 is screwed, and is fixedly connected on bracing members in steel purlin.
It is appreciated that prestressed applying mode can also use other way in the prior art, such as jack is arranged in steel
Between the end and steel purlin of support, after completing prestressed application, jack is cemented out with displacement apparatus.
For convenient for going up and down to support portion, the upside on bracing members is provided with lifting lug 321, using in margin of foundation pit
Crane or other derricking gears go up and down support portion, and assist installing.It certainly, can also be according to specific construction requirement
Lifting lug is set in steel purlin.
Claims (8)
1. removable bracing members, is used for pattern foundation pit supporting structure, the edge of foundation pit is provided with supporting construction, is characterized in that,
Several guide rails and N layers of support portion arranged up and down, N >=2 are provided in foundation pit, every layer of support portion includes that one of steel encloses
Purlin and the bracing members being connected in the steel purlin；Guide rail is fixed on the inside of supporting construction along the vertical direction, in steel purlin
It is fixedly installed guide part, locking member is provided on guide part, which can be fixed on guide part on guide rail；
After applying prestressing force to bracing members, the bracing members are by the steel purlin tight abutment connected in supporting construction；When not having
When having prestressing force, under external force, support portion can be moved up and down along guide rail；
When support portion is moved up and down along guide rail, locking member is in the state separated with guide rail.
2. removable bracing members according to claim 1, which is characterized in that be formed with interconnecting piece, guide rail at the top of guide rail
Interconnecting piece be fixedly connected in supporting construction, the lower end surface of guide rail extends down into the lower section of the bottom surface of foundation pit；In interconnecting piece
In space between the bottom surface of foundation pit, through slot is formed between guide rail and supporting construction；
It is provided with pilot hole along the vertical direction in steel purlin, steel purlin is set on guide rail through the pilot hole.
3. removable bracing members according to claim 2, which is characterized in that between the lower end surface of guide rail and the bottom surface of foundation pit
Distance >=0.5 meter.
4. removable bracing members according to claim 2 or 3, which is characterized in that the guide rail at least have two along perpendicular
To the raised line of extension, the locking member is locked together on the raised line histogram.
5. removable bracing members according to claim 4, which is characterized in that the cross section of the guide rail is H-shaped, the guide rail
The edge of a wing with web He the opposite two sides that web is arranged in, the edge of a wing is perpendicular to web；The edge of a wing is formed as above-mentioned convex
Item；
The guide part has the guide way at the edge for the pilot hole that steel purlin is arranged in, and guiding is provided on the guide way
At least one edge of a wing of slot, the guide rail is extend into the guide groove；The screw thread that connection guide groove is provided on guide way is logical
Hole is screwed with fixing bolt in tapped through hole inward turning, which fixes the above-mentioned edge of a wing extending into guide groove, makes to be oriented to
Portion is fixed on guide rail；The fixing bolt is formed as above-mentioned locking member.
6. removable bracing members according to claim 2 or 3, which is characterized in that the guide part includes being fixed on steel to enclose
Guide cylinder on purlin, the guide cylinder extend along the vertical direction, and the guide cylinder is set on guide rail, at least in the side wall of guide cylinder
Opposite sides offer the screw fastening tieholen of through hole shape, be screwed with clamping screw in screw-threaded coupling through-hole inward turning, the clamping screw
Guide part is fixed on guide rail；The clamping screw is formed as above-mentioned locking member.
7. removable bracing members according to claim 1, which is characterized in that the steel purlin is made of H profile steel, and H
The web of fashioned iron is horizontally disposed；
The both ends of the bracing members are resisted against on the medial surface of steel purlin, between the end face of bracing members and the medial surface of steel purlin
It is provided with and compresses plate, this compresses the hook portion that plate includes main board He is formed on main board, this compresses plate through the hook portion
It hangs in steel purlin.
8. removable bracing members according to claim 1, which is characterized in that be provided with column, at least one in foundation pit
Guide hole is offered on root bracing members, which is set on column through the guide hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821519688.4U CN209082512U (en) | 2018-09-17 | 2018-09-17 | Removable bracing members |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821519688.4U CN209082512U (en) | 2018-09-17 | 2018-09-17 | Removable bracing members |
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| CN209082512U true CN209082512U (en) | 2019-07-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111206592A (en) * | 2020-01-15 | 2020-05-29 | 天津大学 | Construction method of prefabricated steel-concrete combined support foundation pit supporting structure |
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2018
- 2018-09-17 CN CN201821519688.4U patent/CN209082512U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111206592A (en) * | 2020-01-15 | 2020-05-29 | 天津大学 | Construction method of prefabricated steel-concrete combined support foundation pit supporting structure |
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