CN106958188B - Arch foot support device and its construction method - Google Patents
Arch foot support device and its construction method Download PDFInfo
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- CN106958188B CN106958188B CN201710401193.5A CN201710401193A CN106958188B CN 106958188 B CN106958188 B CN 106958188B CN 201710401193 A CN201710401193 A CN 201710401193A CN 106958188 B CN106958188 B CN 106958188B
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- frame body
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- arch springing
- arch
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D6/00—Truss-type bridges
- E01D6/02—Truss-type bridges of bowstring type
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The present invention provides a kind of Arch foot support device and its construction methods.Wherein, which includes: support frame, the first supporting mechanism and the second supporting mechanism；Wherein, the bottom end of support frame is connected with the cushion cap of arch springing to be supported；The lower boom of arch springing to be supported is connected by the first supporting mechanism with support frame；The top boom of arch springing to be supported is connected by the second supporting mechanism with support frame.The first supporting mechanism in the present invention is connected to the lower boom of arch springing to be supported, second supporting mechanism is connected to the top boom of arch springing to be supported, and, first supporting mechanism is connected with support frame with the second supporting mechanism, and then it realizes to treat and supports arch springing pre-buried using the measure progress rigidly fixed, so that arch springing to be supported is when interting construction before civil engineering pours, the angles and positions of arch springing to be supported are not subjected to displacement, deflection, it ensure that setting angle and positioning coordinate, the adjustment time of arch springing to be supported is also eliminated simultaneously, improves construction efficiency.
Description
Technical field
The present invention relates to technical field of civil engineering, in particular to a kind of Arch foot support device and its construction
Method.
Background technique
Base-supporting inverted triangle Concrete Filled Steel-tube Truss Arch Bridge, arch rib section are in up-side down triangle, You Duogen steel pipe chord member composition.
Arch rib is consolidated in concrete saddle using flush type construction, and skewback uses reinforced concrete structure, interface from arch abutment it is trapezoidal to
The rectangle gradual change of beam-ends.Arch rib according to it is pre-buried with it is non-it is pre-buried be divided into 3 sections, the arch rib embedded section at arch rib both ends is known as arch springing, intermediate
Non- embedded section is known as interlude.Arch springing section consists of two parts, a part need to nuzzle in advance skewback and with skewback steel knot it is cast-in-place, separately
A part has just connect outside skewback, through inner flange with interlude.Arch springing embedded section is generally at an angle to the horizontal surface, for example, about
35 °~45 °, according to sequence of construction, arch springing of generally first constructing reaches the mountable interlude in design requirement rear to concrete strength
Arch rib.The setting angle and location dimension of arch springing have very big influence to the quality of bridge, and therefore, pair cross-section is in the arch of inverted triangle
The setting angle and location dimension of foot section are more demanding.
Summary of the invention
In consideration of it, the invention proposes a kind of Arch foot support device and its construction methods, it is intended to solve how to improve
The problem of setting angle and location dimension of arch springing.
On one side, the invention proposes a kind of Arch foot support devices.The device includes: support frame, the first support
Mechanism and the second supporting mechanism；Wherein, the bottom end of support frame is connected with the cushion cap of arch springing to be supported；The lower edge of arch springing to be supported
Bar is connected by the first supporting mechanism with support frame；The top boom of arch springing to be supported passes through the second supporting mechanism and support frame phase
Connection.
Further, in above-mentioned Arch foot support device, the first supporting mechanism includes: conduit saddle and the first connecting plate；Its
In, the top of conduit saddle is connected with lower boom, and the bottom end of conduit saddle is connected by the first connecting plate with support frame.
Further, in above-mentioned Arch foot support device, conduit saddle be it is multiple, each conduit saddle is set side by side and is all connected to down
Between chord member and the first connecting plate.
Further, in above-mentioned Arch foot support device, the first supporting mechanism further include: clutch mechanism, the first connection
Plate is connected by clutch mechanism with support frame.
Further, in above-mentioned Arch foot support device, clutch mechanism includes: the second connecting plate and connector；Wherein,
Second connecting plate is set to the lower section of the first connecting plate and is connected with the first connecting plate；Connector is bending part, connector
First bending part is connected with the second connecting plate, and the second bending part of connector is connected with support frame.
Further, in above-mentioned Arch foot support device, reinforcement is provided between the first bending part and the second bending part
Plate.
Further, in above-mentioned Arch foot support device, the second supporting mechanism includes: that crossbeam and two are parallel arrangement of
Support rod；Wherein, the first end of each support rod is connected with top boom, and the second end of each support rod is connected with crossbeam；
Crossbeam is connected with support frame.
Further, in above-mentioned Arch foot support device, support frame includes: the first frame body, the second frame body and third frame
Body；Wherein, the first frame body is placed in the lower section of arch springing to be supported and is connected with cushion cap；Second frame body is placed under arch springing to be supported
Side, the second frame body are placed in the top of the first frame body and are connected with the first frame body, and lower boom passes through the first supporting mechanism and second
Frame body is connected；Third frame body is corresponding with the position of arch springing to be supported, and third frame body is placed in the top of the second frame body and with
Two frame bodies are connected, and top boom is connected by the second supporting mechanism with third frame body.
The first supporting mechanism in the present invention is connected to the lower boom of arch springing to be supported, and the second supporting mechanism is connected to wait prop up
The top boom of arch springing is supportted, also, the first supporting mechanism is connected with support frame with the second supporting mechanism, and then realizes and treat
Support arch springing carried out using the measure that rigidly fixes it is pre-buried so that arch springing to be supported is when interting construction before civil engineering pours, wait prop up
The angles and positions of support arch springing are not subjected to displacement, deflection, ensure that setting angle and positioning coordinate, while also eliminating to be supported
The adjustment time of arch springing, improves construction efficiency.
On the other hand, the invention also provides a kind of construction methods of Arch foot support device.This method includes as follows
Step: the first supporting mechanism and the second supporting mechanism are respectively arranged in the lower edge of arch springing to be supported by supporting mechanism installation steps
Bar and top boom；Support frame is connected by support frame installation steps with the cushion cap of arch springing to be supported, by the first supporting mechanism and branch
Support is connected, and the second supporting mechanism is connected with support frame.
Further, in the construction method of above-mentioned Arch foot support device, support frame installation steps further comprise: the
One erection of frames sub-step, support frame include: the first frame body, the second frame body and third frame body；First frame body is placed in be supported
The lower section of arch springing and it is connected with cushion cap；Second frame body is placed in the lower section of arch springing to be supported by the second erection of frames sub-step, will
Second frame body is placed in the top of the first frame body and is connected with the first frame body, and lower boom passes through the first supporting mechanism and the second frame body
It is connected；Third erection of frames sub-step, third frame body is corresponding with the position of arch springing to be supported, and third frame body is placed in second
The top of frame body and it is connected with the second frame body, top boom is connected by the second supporting mechanism with third frame body.
First supporting mechanism is connected to the lower boom of arch springing to be supported in the present invention, by the second supporting mechanism be connected to
The top boom of arch springing is supported, also, the first supporting mechanism is connected with support frame with the second supporting mechanism, and then realizes pair
Arch springing to be supported carried out using the measure rigidly fixed it is pre-buried so that arch springing to be supported is when interting construction before civil engineering pours, to
It supports the angles and positions of arch springing not to be subjected to displacement, deflection, ensure that setting angle and positioning coordinate, while also eliminating wait prop up
The adjustment time for supportting arch springing, improves construction efficiency.
Detailed description of the invention
By reading the following detailed description of the preferred embodiment, various other advantages and benefits are common for this field
Technical staff will become clear.The drawings are only for the purpose of illustrating a preferred embodiment, and is not considered as to the present invention
Limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings:
Fig. 1 is the structural schematic diagram of Arch foot support device provided in an embodiment of the present invention；
Fig. 2 is the structural schematic diagram of the first supporting mechanism in Arch foot support device provided in an embodiment of the present invention；
Fig. 3 is the structural schematic diagram of the second supporting mechanism in Arch foot support device provided in an embodiment of the present invention；
Fig. 4 is the structural schematic diagram of support frame in Arch foot support device provided in an embodiment of the present invention；
Fig. 5 is the flow chart of the construction method of Arch foot support device provided in an embodiment of the present invention；
Fig. 6 be Arch foot support device provided in an embodiment of the present invention construction method in, support frame installation steps
Flow chart.
Specific embodiment
Exemplary embodiments of the present disclosure are described in more detail below with reference to accompanying drawings.Although showing the disclosure in attached drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here
It is limited.On the contrary, these embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can be by the scope of the present disclosure
It is fully disclosed to those skilled in the art.It should be noted that in the absence of conflict, embodiment in the present invention and
Feature in embodiment can be combined with each other.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
Installation practice:
Referring to Fig. 1, the preferred structure of Arch foot support device provided in this embodiment is shown in figure.As shown,
The device includes: support frame 1, the first supporting mechanism 2 and the second supporting mechanism 3.
Wherein, arch springing 4 to be supported can in workshop pre-production, by the bottom end (for Fig. 1) of support frame 1 with wait prop up
The cushion cap 41 of support arch springing 4 is connected using expansion bolt.Referring to ground sample and moulding bed position, in the lower boom 42 of arch springing 4 to be supported
Lower surface selection one at known coordinate point, the first supporting mechanism 2 is welded in lower boom 42, and the first supporting mechanism 2 with
Support frame 1 is connected, and then realizes that lower boom 42 is connected by the first supporting mechanism 2 with support frame 1.Arch springing 4 to be supported
The upper surface of top boom 43 is welded with the second supporting mechanism 3, and the second supporting mechanism 3 is connected with support frame 1, and then realizes
Top boom 43 is connected by the second supporting mechanism 3 with support frame 1.
In the present embodiment, the first supporting mechanism 2 is connected to the lower boom 42 of arch springing 4 to be supported, the connection of the second supporting mechanism 3
In the top boom 43 of arch springing 4 to be supported, also, the first supporting mechanism 2 is connected with support frame 1 with the second supporting mechanism 3, into
And realize to treat and support arch springing 4 pre-buried using the measure progress rigidly fixed, so that arch springing to be supported 4 is worn before civil engineering pours
When inserting construction, the angles and positions of arch springing 4 to be supported are not subjected to displacement, deflection, ensure that setting angle and positioning coordinate, simultaneously
The adjustment time of arch springing 4 to be supported is also eliminated, construction efficiency is improved.
Referring to fig. 2, shown in figure in Arch foot support device provided in this embodiment, the first supporting mechanism 2 it is excellent
Select structure.As shown, the first supporting mechanism 2 may include: conduit saddle 21 and the first connecting plate 22.Wherein, the top of conduit saddle 21
(for Fig. 2) can be welded in the lower surface of lower boom 42, and the bottom end (for Fig. 2) of conduit saddle 21 is welded with
One connecting plate 22, and the first connecting plate 22 is then connected with support frame 1.When it is implemented, answering the first connecting plate of strict control 22
It is parallel to the horizontal plane.Stiffening plate can be set between conduit saddle 21 and the first connecting plate 22.Conduit saddle 21 can be lattice conduit saddle.
Conduit saddle 21 can be to be multiple, and each conduit saddle 21 is juxtaposed between lower boom 42 and the first connecting plate 22, and then to lower boom 42
Preferably supported.
In above-described embodiment, the first supporting mechanism 2 can also include: clutch mechanism 23.First connecting plate 22 passes through overlap joint
Mechanism 23 is connected with support frame 1, and then realizes effective overlap joint of conduit saddle 21 and support frame 1.Clutch mechanism 23 may include:
Two connecting plates 231 and connector 232.Wherein, the second connecting plate 231 is stacked in the lower section of the first connecting plate 22 and connect with first
Plate 22 is bolted.Connector 232 can be bending part, and the first bending part 2321 of connector 232 can be with the second connecting plate
231 are connected, and the second bending part 2322 of connector 232 can be connected with support frame 1.When it is implemented, the second connecting plate
231 lower surface can be welded with multiple steel plates 6 being set side by side, and the bottom end of each steel plate 6 is upper with the first bending part 2321
It mutually welds on surface.Stiffening plate 5 can be set between first bending part 2321 and the second bending part 2322, to reinforce connector
232 rigidity.
Referring to Fig. 3, shown in figure in Arch foot support device provided in this embodiment, the second supporting mechanism 3 it is excellent
Select structure.As shown, the second supporting mechanism 3 may include: crossbeam 31 and two parallel arrangement of support rods 32.Wherein, respectively
The first end (lower end shown in Fig. 3) of support rod 32 can be welded with 43 phase of top boom, second end (Fig. 3 of each support rod 32
Shown in upper end) can be welded with 31 phase of crossbeam.When it is implemented, the first end of each support rod 32 all can be arc, into
And more it is bonded top boom 43.Crossbeam 31 can be bolted with support frame 1, and then realize Fast Installation.Each support rod 32 is answered
With horizontal plane, for balancing the center of gravity of arch springing 4 to be supported, to avoid arch springing 4 to be supported is in overhanging state and occur compared with
Big inclination.
Referring to fig. 4, it is shown in figure as in Arch foot support device provided in this embodiment, the preferred machine of support frame 1
Structure.As shown, support frame 1 may include: the first frame body 11, the second frame body 12 and third frame body 13.Wherein, the first frame body
11, the second frame body 12 and third frame body 13 are successively stacked and are bolted from bottom to up, and the first frame body 11 is placed in arch springing 4 to be supported
Lower section and be connected with cushion cap 41 using expansion bolt, third frame body 13 is corresponding with the position of arch springing 4 to be supported, lower boom
42 are connected by the first supporting mechanism 2 with the second frame body 12, and top boom 43 passes through the second supporting mechanism 3 and 13 phase of third frame body
Connection.When it is implemented, the first frame body 11 can may be lattice for one chip.The height of second frame body 12 needs to meet
Transport requires, and is allowed to not overlength, non-ultra-wide, not superelevation；It can be set between second connecting plate 231 and the second bending part 2322
The preferable H profile steel 7 of force-bearing situation；In addition, according to actual needs, cant beam and outrigger can be arranged at the crossbeam of the second frame body 12
Support device as 3 power transmission of the second supporting mechanism.
To sum up, the first supporting mechanism is connected to the lower boom of arch springing to be supported, the connection of the second supporting mechanism in the present embodiment
In the top boom of arch springing to be supported, also, the first supporting mechanism is connected with support frame with the second supporting mechanism, and then realizes
Treat support arch springing carried out using the measure rigidly fixed it is pre-buried so that arch springing to be supported interts construction before civil engineering pours
When, the angles and positions of arch springing to be supported are not subjected to displacement, deflection, ensure that setting angle and positioning coordinate, while also saving
The adjustment time of arch springing to be supported, improves construction efficiency.
Embodiment of the method:
Referring to Fig. 5, Fig. 5 is the flow chart of the construction method of Arch foot support device provided in this embodiment.As schemed
Show, this method comprises the following steps:
First supporting mechanism and the second supporting mechanism are respectively arranged in arch springing to be supported by supporting mechanism installation steps S510
Lower boom and top boom.
Specifically, referring to ground sample and moulding bed position, known at the lower surface selection one of the lower boom 42 of arch springing 4 to be supported
First supporting mechanism 2 is welded in lower boom 42 by coordinate points.In the upper surface welding second of the top boom 43 of arch springing 4 to be supported
Supporting mechanism.
Support frame is connected by support frame installation steps S520 with the cushion cap of arch springing to be supported, by the first supporting mechanism with
Support frame is connected, and the second supporting mechanism is connected with support frame.
Specifically, arch springing 4 to be supported can in workshop pre-production, by the bottom end (for Fig. 1) of support frame 1 with to
The cushion cap 41 of support arch springing 4 is connected using expansion bolt.Then the first supporting mechanism 2 is connected with support frame 1, finally will
Second supporting mechanism 3 is connected with support frame 1.
In the present embodiment, the first supporting mechanism 2 is connected to the lower boom 42 of arch springing 4 to be supported, by the second supporting mechanism 3
It is connected to the top boom 43 of arch springing 4 to be supported, also, the first supporting mechanism 2 is connected with support frame 1 with the second supporting mechanism 3
It connects, and then realizes to treat and support arch springing 4 pre-buried using the measure progress rigidly fixed, so that arch springing to be supported 4 is poured in civil engineering
Before building when interspersed construction, the angles and positions of arch springing 4 to be supported are not subjected to displacement, deflection, ensure that setting angle and positioning are sat
Mark, while the adjustment time of arch springing 4 to be supported is also eliminated, improve construction efficiency.
Referring to Fig. 6, in an embodiment of the present invention, support frame installation steps S520 be may further include:
Support frame 1 includes: the first frame body 11, the second frame body 12 and third frame body 13.
First erection of frames sub-step S521, is placed in the lower section of arch springing to be supported for the first frame body and is connected with cushion cap.
Specifically, the first frame body 11 is placed in the lower section of arch springing 4 to be supported, also, the first frame body 11 is used with cushion cap 41
Expansion bolt is connected,
Second frame body, is placed in the lower section of arch springing to be supported, the second frame body is placed in by the second erection of frames sub-step S522
The top of first frame body and it is connected with the first frame body, lower boom is connected by the first supporting mechanism with the second frame body.
Specifically, the second frame body 12 is placed in the lower section of arch springing 4 to be supported and be placed on the first frame body 11, by the second frame body
12 are bolted with the first frame body 11, and lower boom 42 is connected by the first supporting mechanism 2 with the second frame body 12.
Third erection of frames sub-step S523, third frame body is corresponding with the position of arch springing to be supported, and third frame body is set
In the second frame body top and be connected with the second frame body, top boom is connected by the second supporting mechanism with third frame body.
Specifically, the position of third frame body 13 is corresponding with the position of arch springing 4 to be supported, and third frame body 13 is placed in second
It is bolted on frame body 12 and with the second frame body 12, top boom 43 is connected by the second supporting mechanism 3 with third frame body 13.It needs
It is noted that the installation of the first frame body 11, the second frame body 12 and third frame body 13 is first completed, then again by the first supporting mechanism
2 are connected with support frame 1, and finally the second supporting mechanism 3 is connected with support frame 1.
In the present embodiment, the installation of the first frame body 11, the second frame body 12 and third frame body 13 is first completed, then again by first
Supporting mechanism 2 is connected with support frame 1, and finally the second supporting mechanism 3 is connected with support frame 1, ensure that support frame 1,
The accurate installation of one supporting mechanism 2 and the second supporting mechanism 3 and arch springing 4 to be supported.
To sum up, the first supporting mechanism is connected to the lower boom of arch springing to be supported, by the second supporting mechanism in the present embodiment
It is connected to the top boom of arch springing to be supported, also, the first supporting mechanism is connected with support frame with the second supporting mechanism, in turn
Realizing to treat supports arch springing pre-buried using the measure progress rigidly fixed, applies so that arch springing to be supported interts before civil engineering pours
In working hour, the angles and positions of arch springing to be supported are not subjected to displacement, deflection, ensure that setting angle and positioning coordinate, while also saving
The adjustment time for having removed arch springing to be supported, improves construction efficiency.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (9)
1. a kind of Arch foot support device characterized by comprising support frame (1), the first supporting mechanism (2) and second
Support mechanism (3)；Wherein,
The bottom end of support frame as described above (1) is connected with the cushion cap (41) of arch springing to be supported (4)；
The lower boom (42) of the arch springing to be supported (4) is connected by first supporting mechanism (2) with support frame as described above (1)
It connects；First supporting mechanism (2) includes: the first connecting plate (22) and multiple conduit saddles (21)；Wherein, each conduit saddle (21) is simultaneously
Column are arranged and are all connected between the lower boom (42) and first connecting plate (22)；
The top boom (43) of the arch springing to be supported (4) is connected by second supporting mechanism (3) with support frame as described above (1)
It connects.
2. Arch foot support device according to claim 1, which is characterized in that
The top of the conduit saddle (21) is connected with the lower boom (42), and the bottom end of the conduit saddle (21) connects by described first
Fishplate bar (22) is connected with support frame as described above (1).
3. Arch foot support device according to claim 2, which is characterized in that first supporting mechanism (2) is also wrapped
It includes:
Clutch mechanism (23), first connecting plate (22) are connected by the clutch mechanism (23) with support frame as described above (1).
4. Arch foot support device according to claim 3, which is characterized in that the clutch mechanism (23) includes:
Two connecting plates (231) and connector (232)；Wherein,
Second connecting plate (231) be set to the lower section of first connecting plate (22) and with the first connecting plate (22) phase
Connection；
The connector (232) is bending part, the first bending part (2321) and second connecting plate of the connector (232)
(231) it is connected, the second bending part (2322) of the connector (232) is connected with support frame as described above (1).
5. Arch foot support device according to claim 4, which is characterized in that
Stiffening plate (5) are provided between first bending part (2321) and second bending part (2322).
6. Arch foot support device according to claim 1, which is characterized in that second supporting mechanism (3) includes:
Crossbeam (31) and two parallel arrangement of support rods (32)；Wherein,
The first end of each support rod (32) is connected with the top boom (43), the second end of each support rod (32)
It is connected with the crossbeam (31)；
The crossbeam (31) is connected with support frame as described above (1).
7. Arch foot support device according to any one of claim 1 to 6, which is characterized in that support frame as described above (1)
It include: the first frame body (11), the second frame body (12) and third frame body (13)；Wherein,
First frame body (11) is placed in the lower section of the arch springing to be supported (4) and is connected with the cushion cap (41)；
Second frame body (12) is placed in the lower section of the arch springing to be supported (4), and second frame body (12) is placed in described first
The top of frame body (11) and it is connected with first frame body (11), the lower boom (42) passes through first supporting mechanism
(2) it is connected with second frame body (12)；
The third frame body (13) is corresponding with the position of the arch springing (4) to be supported, and the third frame body (13) is placed in described
The top of second frame body (12) and it is connected with second frame body (12), the top boom (43) passes through the second support machine
Structure (3) is connected with the third frame body (13).
8. a kind of construction method of Arch foot support device, which comprises the steps of:
First supporting mechanism and the second supporting mechanism are respectively arranged in the lower boom of arch springing to be supported by supporting mechanism installation steps
And top boom；
Support frame is connected by support frame installation steps with the cushion cap of the arch springing to be supported, by first supporting mechanism with
Support frame as described above is connected, and second supporting mechanism is connected with support frame as described above；The first supporting mechanism packet
It includes: the first connecting plate and multiple conduit saddles；Wherein, each conduit saddle is set side by side and is all connected to the lower boom and described first
Between connecting plate.
9. the construction method of Arch foot support device according to claim 8, which is characterized in that support frame as described above installation
Step further comprises:
First erection of frames sub-step, support frame as described above include: the first frame body, the second frame body and third frame body；By described first
Frame body is placed in the lower section of the arch springing to be supported and is connected with the cushion cap；
Second frame body is placed in the lower section of the arch springing to be supported by the second erection of frames sub-step, by second frame body
Be placed in the top of first frame body and be connected with first frame body, the lower boom by first supporting mechanism with
Second frame body is connected；
Third erection of frames sub-step, the third frame body is corresponding with the position of the arch springing to be supported, by the third frame
Body is placed in the top of second frame body and is connected with second frame body, and the top boom passes through second supporting mechanism
It is connected with the third frame body.
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