CN108560562A - A kind of stay length adjustable deep foundation pit support prestressing force fish belly sill - Google Patents
A kind of stay length adjustable deep foundation pit support prestressing force fish belly sill Download PDFInfo
- Publication number
- CN108560562A CN108560562A CN201810506930.2A CN201810506930A CN108560562A CN 108560562 A CN108560562 A CN 108560562A CN 201810506930 A CN201810506930 A CN 201810506930A CN 108560562 A CN108560562 A CN 108560562A
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- CN
- China
- Prior art keywords
- drag
- line
- strut
- fish belly
- belly sill
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
- E04C3/11—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with non-parallel upper and lower edges, e.g. roof trusses
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
- E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
- E04C2003/0408—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by assembly or the cross-section
- E04C2003/0413—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by assembly or the cross-section being built up from several parts
- E04C2003/0417—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by assembly or the cross-section being built up from several parts demountable
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
- E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
- E04C2003/0443—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by substantial shape of the cross-section
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
- E04C2003/0486—Truss like structures composed of separate truss elements
- E04C2003/0491—Truss like structures composed of separate truss elements the truss elements being located in one single surface or in several parallel surfaces
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Reinforcement Elements For Buildings (AREA)
Abstract
The invention discloses a kind of stay length adjustable deep foundation pit support prestressing force fish belly sill, which includes a waist rail (1), at least a strut (2) and an at least drag-line (3)；The upper end of the strut (2) is fixed on by high-strength bolt on the waist rail (1), the lower end connection cable support node (9) of strut (2), drag-line (3) is passed through out of cable support node (9) drag-line channel, and drag-line (3) both ends are anchored in the anchor-hold device (5).Fish belly sill both ends and the purlin adjoined are spliced, and there is the bearing of symmetrical or angle brace in end.Prestressed application and strut make fish belly sill bending stiffness big the supporting role of waist rail, can reduce to support quantity to increase working space in hole.Stay length can carry out telescopic adjustment according to monitoring data in the present invention, can preferably control the deformation of foundation pit supporting construction；The installation of spare rope increases the rigidity and safety stock of fish belly sill.
Description
Technical field
The present invention relates to technical field of civil engineering more particularly to a kind of adjustable deep foundation pit supports of stay length with answering in advance
Power fish belly sill.
Background technology
It is required for situations such as combining geological conditions and surrounding enviroment to carry out rational foundation pit branch general base pit engineering
Protection structure design and construction.A kind of supporting and retaining system formula structure supporting knot most wide as the most commonly used and scope of application in deep-foundation pit engineering
Structure, it includes pull-type anchor, brace type, cantilevered, double-row pile and contrary sequence method etc..Wherein anchor is pull-type and double-row pile can occupy more base
The underground space on periphery is cheated, and double-row pile cost is higher, and to be generally placed at urban inner buildings or structures close for deep-foundation pit engineering
Ji Qu, so both supporting construction are using less.Cantilevered rigidity is smaller, Deformation control ability is poor, should not be in depth
It is used in larger deep basal pit.The inner support of brace type and contrary sequence method can reduce foundation pit interior construction space with floor so that soil
Side is excavated and the disengaging of material installation is difficult.
In order to obtain the bending stiffness that larger foundation pit interior construction space just needs increase purlin, to increase to (angle)
The distance between support.Although concrete support in the prior art has larger rigidity, but the construction period of concrete is longer
And concrete support dismounting is troublesome and can not reuse.
Invention content
Technical problem：The present invention provides a kind of bending stiffness is big, it is possible to increase adjustable to the stay length of (angle) tie distance
Deep foundation pit support prestressing force fish belly sill.Technical problem to be solved is, overcomes deep foundation pit support knot in the prior art
Structure be difficult to meet simultaneously Supporting Structure deformation control ability is strong, construction operation space is big in hole and all underground spaces in hole occupy it is few etc.
It is required that the shortcomings that.
Technical solution：The present invention is a kind of adjustable deep foundation pit support prestressing force fish belly sill of stay length, the fish belly sill
Including a waist rail, at least a strut and an at least drag-line；The waist rail is by several waist rail standards segment and two ends
Anchor-hold device is spliced；The strut is by several strut standard segments, diagonal brace and the cable support node being connect with drag-line
It is spliced；
The upper end of the strut is fixed on by high-strength bolt on the waist rail, and the lower end of strut connects cable support node, draws
Rope is passed through out of cable support node drag-line channel, and drag-line both ends are anchored in the anchor-hold device.
Wherein,
It is additionally provided with length adjustment device between strut standard segment and cable support node.
There are symmetrical two in the diagonal brace, is located at the both sides of strut standard segment, reports and connect with waist rail, under
Portion is fixed on strut standard segment.
The drag-line adds the drag-line of structural initial pre stress to be formed with several spare drag-lines by several root applications.
The design principle of the drag-line line style is for the strut to the moment of flexure effect and soil pressure of the waist rail to the waist
The moment of flexure effect of beam is close as possible.
Waist rail standard segment, anchor-hold device, strut standard segment, diagonal brace, length adjustment device, cable support node
All it is standard component, these standard components can be prefabricated in the factory, on-site consolidation, recyclable recycling after construction terminates.
The frictional constraint that the drag-line is subject on the cable support node is very small, and the Suo Li of the drag-line is basic along overall length
It is equal.
The fish belly sill is by the attachment device reserved on the anchor-hold device and the purlin adjoined and to support or angle
Support is fixed.
Advantageous effect：Compared with prior art, the present invention haing the following advantages：
(1) the technical program can effectively reduce friction loss of the drag-line prestressing force in pulling anchor cable stage so that each section of drawing
The tensile stress of rope is equal.The small actual loading situation and Deformation control situation that can make structure of the prestressed friction loss of drag-line
More meet with design result.The equal tensile capacity that can make full use of drag-line of Suo Yingli, prevents control stress for prestressing by certain
The limitation of one section of drag-line stress value.
(2) stay length in the technical program can carry out telescopic adjustment.The adjustability of stay length can be real
Active control of the existing fish belly sill support to foundation pit deformation.Soil pressure may be because of geotechnical engineering investigation error, all preloadings in hole and precipitation
Etc. reasons and it is inconsistent with design value, each strut to the support force of waist rail may also due to manufacture, assembly or construction error and with
Desired value is inconsistent.It is different with desired value when monitor fish belly sill deformation of the part into hole or development of deformation rate situations such as
It, can size of the length to change cable tension by changing each strut and its distribution on each strut or when more than alarm value
Situation, by the size and its distribution situation that change cable tension keep it equal as possible to the moment of flexure effect of waist rail with soil pressure come
Reduce being deformed into hole for waist rail.
(3) the spare drag-line in the technical program can increase the rigidity and safety stock of fish belly sill support.Drag-line section
The more big bigger i.e. fish belly sill rigidity of then waist rail deformation backstay pulling force value added of product is bigger.When partial prestressing Cable failure,
The presence of spare drag-line can reduce the adverse effect that broken string load is brought and reduce the excessive of other prestressed cable stress values
Increase.It is different or more than police with desired value when monitor fish belly sill whole deformation or development of deformation rate into hole situations such as
When report value, it can be made to be connect as possible to the moment of flexure effect of waist rail with soil pressure to increase cable tension value by the spare drag-line of tensioning
Closely, reduce foundation pit deformation.
(4) fish belly sill in the technical program can realize that prefabrication assembled in situ, recyclable recycling are a kind of warps
Help efficient, environmentally protective support system.
Description of the drawings
Fig. 1 is brace type foundation pit supporting construction schematic diagram in the prior art；
Fig. 2 is prestressing force fish belly sill foundation pit supporting construction schematic diagram in the prior art；
Fig. 3 is a kind of adjustable deep foundation pit support prestressing force fish belly sill schematic diagram of stay length of the present invention；
Fig. 4 is the length adjustment device schematic diagram in strut of the present invention；
Fig. 5 is the cable support node schematic diagram of strut end of the present invention；
Fig. 6 is the anchor-hold schematic device of waist rail end of the present invention.
Have in figure：Waist rail 1, at least a strut 2, drag-line 3, waist rail standard segment 4, anchor-hold device 5, strut standard
Segment 6, diagonal brace 7, length adjustment device 8, cable support node 9.
Specific implementation mode
The present invention stay length adjustable deep foundation pit support prestressing force fish belly sill, including a waist rail, at least one
Strut and at least a drag-line.The waist rail is spliced by several intermediate standard segments and 2 end anchor-hold devices.Institute
Strut is stated to be made of several intermediate standard segments, length adjustment device, the cable support node connecting with drag-line and diagonal brace.The drag-line
The prestressed cable of structural initial pre stress and several spare drag-lines is added to form by several root applications.
Each strut is fixed on by high-strength bolt on waist rail and vertical with the waist rail, and each strut is in the waist
It is symmetrically arranged on beam.The drag-line is passed through out of each cable support node drag-line channel, and the drag-line both ends are anchored at
In the anchor-hold device.The strut supports the drag-line by the drag-line channel of the cable support node and changes itself and institute
The angle of waist rail is stated, the drag-line can be free to slide without by larger frictional constraint in the drag-line channel.The fish belly
Beam supports fixation by the attachment device reserved on the anchor-hold device and the purlin adjoined and to (angle).
The design principle of fixed position and the drag-line line style of the strut on the waist rail is the strut and side
Soil pressure is identical as possible to the moment of flexure effect of the waist rail to reduce deformation of the fish belly sill into hole.One kind of the present invention is excellent
It selects in scheme, fixed position of the strut on the waist rail is anchor point of the drag-line in the anchor-hold device
Between n n+1 Along ent, wherein n be the strut quantity；Each turning point of the drag-line is located at same parabolic with endpoint
On line, parabolical shape is determined according to the span and sag ratio of the fish belly sill.
The length adjustment device in the strut is connected on the intermediate standard segment of the strut and is connect with drag-line
Cable support node between and both ends fixed with bolt.The length adjustment device can be as needed in the length along strut direction
Telescopic adjustment is carried out, changes the length of entire strut by adjusting the length of the device.The length adjustment device can lead to
Screw jack or positive and negative thread pullover are crossed to realize；In a preferred embodiment of the present invention, the length adjustment device is adopted
It is realized with positive and negative thread pullover.Length by adjusting each strut can change the pulling force of the drag-line and its to described
The relative size of each waist rail support force copes with the fish belly Liang Sicheng and desired value caused by the factors such as lateral earth pressure change with this
Inconsistent problem so that deformation of the fish belly sill into hole remains within permissible value.
The drag-line includes several drag-lines for needing to apply structural initial pre stress and several spare ropes.The spare rope exists
The tensioning of active need not be carried out when normal use and need to only be tightened and be anchored at the drag-line together with prestressed cable
In anchor.The spare rope can increase the safety stock of the fish belly sill, in prestressed cable because of originals such as initial imperfections
When because of fracture, reduces the Suo Xianxiang that breaks and adversely affected caused by entire support system；The spare drag-line can also improve described
The rigidity of fish belly sill reduces being deformed into hole for entire supporting construction；The spare drag-line also contributes to formulate emergency preplan, when
It monitors that spare drag-line can be carried out tensioning to control deformation when supporting construction is deformed into hole or development of deformation rate is larger.This
In a kind of preferred embodiment of invention, the spare rope accounts for the 10% of the drag-line total amount.
Each main member is all made of steel making in the fish belly sill, the standard segment therein, anchor-hold device,
Length adjustment device, cable support node and drag-line etc. are all standard components.The standard component is all prefabricated in the factory, respectively reserved
The device being attached with other components.The fish belly sill may be implemented to be prefabricated in the factory, assembled and engineering terminates it at the scene
The purpose recycled afterwards is a kind of economical and efficient, environmentally protective support system.
It is specific as shown in figure 3, the present invention stay length adjustable deep foundation pit support prestressing force fish belly sill, including one
Waist rail 1, several struts 2 and drag-line 3.Waist rail 1 is by several waist rail standards segment 4 and two end anchor-hold devices 5 height
Strength bolt is spliced.Strut is by several strut standards segment 6, diagonal brace 7, length adjustment device 8 and the rope support being connect with drag-line
Node 9 is spliced successively with high-strength bolt.Drag-line 3 by several root applications add structural initial pre stress prestressed cable and several it is standby
It is formed with drag-line.
Strut 2 is fixed on by high-strength bolt on waist rail 1, and drag-line 3 is passed through out of each cable support node 9 drag-line channel, is drawn
3 both ends of rope are anchored in anchor-hold device 5.Strut 2 drag-line 3 is supported by the drag-line channel of cable support node 9 and change its with
The angle of waist rail 1, drag-line 3 can slide in drag-line channel without by too big frictional constraint.Fish belly sill is fixedly mounted with by guy anchor
It sets the attachment device reserved on 5 and the purlin adjoined and (angle) is supportted and fix.
Drag-line 3 and the tie point of each strut 2 and anchor-hold device 5 are located on same parabola, rise 3.85m.Support
Fixed position of the strut standard segment 6 of bar 2 on waist rail 1 is 5 between anchor point of the drag-line 3 in anchor-hold device 5
A 6 Along ent, diagonal brace 7 and the angle of waist rail 1 are 60 °.Fish belly sill is symmetrical about intermediate cross-section, waist rail total span 24m, support
Distance between tie rods 4m；Side stay length is followed successively by 2.14m, 3.42m, 3.85m；Drag-line needs to apply prestressed including 18Steel strand wires and 4 it is spareSteel strand wires；Waist rail intermediate standard segment using the shaped steel of HW400 × 400 × 13 × 21,
Strut intermediate standard segment and diagonal brace are using the shaped steel of HW300 × 300 × 10 × 15.
Length adjustment device 8 is series between strut standard segment 6 and cable support node 9 and both ends are fixed with high-strength bolt,
Change the length of entire strut 2 by adjusting the length of the device, which is realized using positive and negative thread pullover.Pass through tune
The pulling force of drag-line 3 and its relative size to 1 support force of waist rail can be changed by saving the length of each strut 2, and offside soil pressure is answered with this
Fish belly Liang Sicheng and the inconsistent problem of desired value caused by the factors such as power change so that deformation of the fish belly sill into hole is protected always
It holds within permissible value.
Above-described embodiment is only the preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill of the art
For personnel, without departing from the principle of the present invention, several improvement and equivalent replacement can also be made, these are to the present invention
Claim be improved with the technical solution after equivalent replacement, each fall within protection scope of the present invention.
Claims (7)
1. a kind of stay length adjustable deep foundation pit support prestressing force fish belly sill, which is characterized in that the fish belly sill includes one
Waist rail (1), at least a strut (2) and at least a drag-line (3)；The waist rail (1) is by several waist rail standards segment (4) and two
A end anchor-hold device (5) is spliced；The strut (2) by several strut standard segments (6), diagonal brace (7) and with
The cable support node (9) of drag-line connection is spliced；
The upper end of the strut (2) is fixed on by high-strength bolt on the waist rail (1), the lower end connecting strand support section of strut (2)
Point (9), drag-line (3) are passed through out of cable support node (9) drag-line channel, and drag-line (3) both ends are anchored at the anchor-hold device
(5) in,
Length adjustment device (8) is additionally provided between strut standard segment (6) and cable support node (9).
2. stay length adjustable deep foundation pit support prestressing force fish belly sill according to claim 1, which is characterized in that institute
Stating diagonal brace (7) has symmetrical two, is located at the both sides of strut standard segment (6), and upper part is connect with waist rail (1), lower part
It is fixed on strut standard segment (6).
3. stay length adjustable deep foundation pit support prestressing force fish belly sill according to claim 1, which is characterized in that institute
State drag-line (3) adds the drag-line of structural initial pre stress to be formed with several spare drag-lines by several root applications.
4. stay length adjustable deep foundation pit support prestressing force fish belly sill according to claim 1, which is characterized in that institute
The design principle for stating drag-line (3) line style be the strut (2) to the moment of flexure effect of the waist rail (1) with soil pressure to the waist rail
(1) moment of flexure effect is close as possible.
5. stay length adjustable deep foundation pit support prestressing force fish belly sill according to claim 1, which is characterized in that institute
State waist rail standard segment (4), anchor-hold device (5), strut standard segment (6), diagonal brace (7), length adjustment device (8), rope
It is all standard component to support node (9), these standard components are prefabricated in the factory, on-site consolidation, and construction recycles and reuses after terminating.
6. stay length adjustable deep foundation pit support prestressing force fish belly sill according to claim 1, which is characterized in that institute
State that the frictional constraint that drag-line (3) is subject on the cable support node (9) is very small, the Suo Li of the drag-line (3) is basic along overall length
It is equal.
7. stay length adjustable deep foundation pit support prestressing force fish belly sill according to claim 1, which is characterized in that institute
Fish belly sill is stated to fix by attachment device reserved on the anchor-hold device (5) with the purlin adjoined and to support or angle brace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810506930.2A CN108560562A (en) | 2018-05-24 | 2018-05-24 | A kind of stay length adjustable deep foundation pit support prestressing force fish belly sill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810506930.2A CN108560562A (en) | 2018-05-24 | 2018-05-24 | A kind of stay length adjustable deep foundation pit support prestressing force fish belly sill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108560562A true CN108560562A (en) | 2018-09-21 |
Family
ID=63539608
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810506930.2A Pending CN108560562A (en) | 2018-05-24 | 2018-05-24 | A kind of stay length adjustable deep foundation pit support prestressing force fish belly sill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108560562A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111074942A (en) * | 2019-12-31 | 2020-04-28 | 中车建设工程有限公司 | Large-span rectangular underground station and construction method thereof |
| CN111074941A (en) * | 2019-12-31 | 2020-04-28 | 中车建设工程有限公司 | Large-span composite structural underground station and construction method thereof |
| CN116752589A (en) * | 2023-08-22 | 2023-09-15 | 北京中建建筑科学研究院有限公司 | Prestressed fish belly type reaction frame, pile foundation bearing capacity detection device and application |
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| CN101196015A (en) * | 2007-10-25 | 2008-06-11 | 中国京冶工程技术有限公司 | Beam string structure |
| CN102839675A (en) * | 2012-09-25 | 2012-12-26 | 上海新强劲工程技术有限公司 | Long-span pre-stress fish belly sill for foundation pit support and mounting method thereof |
| CN103967019A (en) * | 2014-05-28 | 2014-08-06 | 德清鑫德机械有限公司 | Fish-bellied beam device for supporting foundation ditch |
| CN203846514U (en) * | 2014-05-28 | 2014-09-24 | 德清鑫德机械有限公司 | Supporting structure for short edge of long-strip rectangular foundation pit |
| CN105178164A (en) * | 2015-08-25 | 2015-12-23 | 广西交通科学研究院 | Prefabricated lifting fish-belly corrugated steel web internal-prestress combined box beam and construction method thereof |
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| CN101196015A (en) * | 2007-10-25 | 2008-06-11 | 中国京冶工程技术有限公司 | Beam string structure |
| CN102839675A (en) * | 2012-09-25 | 2012-12-26 | 上海新强劲工程技术有限公司 | Long-span pre-stress fish belly sill for foundation pit support and mounting method thereof |
| CN103967019A (en) * | 2014-05-28 | 2014-08-06 | 德清鑫德机械有限公司 | Fish-bellied beam device for supporting foundation ditch |
| CN203846514U (en) * | 2014-05-28 | 2014-09-24 | 德清鑫德机械有限公司 | Supporting structure for short edge of long-strip rectangular foundation pit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111074942A (en) * | 2019-12-31 | 2020-04-28 | 中车建设工程有限公司 | Large-span rectangular underground station and construction method thereof |
| CN111074941A (en) * | 2019-12-31 | 2020-04-28 | 中车建设工程有限公司 | Large-span composite structural underground station and construction method thereof |
| CN116752589A (en) * | 2023-08-22 | 2023-09-15 | 北京中建建筑科学研究院有限公司 | Prestressed fish belly type reaction frame, pile foundation bearing capacity detection device and application |
| CN116752589B (en) * | 2023-08-22 | 2023-11-17 | 北京中建建筑科学研究院有限公司 | Prestressed fish belly type reaction frame, pile foundation bearing capacity detection device and application |
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Application publication date: 20180921 |