CN208056066U - A kind of shearing slot structure for underwater concrete back cover - Google Patents
A kind of shearing slot structure for underwater concrete back cover Download PDFInfo
- Publication number
- CN208056066U CN208056066U CN201820438855.6U CN201820438855U CN208056066U CN 208056066 U CN208056066 U CN 208056066U CN 201820438855 U CN201820438855 U CN 201820438855U CN 208056066 U CN208056066 U CN 208056066U
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- Prior art keywords
- angle steel
- building enclosure
- rebound
- back cover
- buried
- 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.)
- Expired - Fee Related
Links
- 238000010008 shearing Methods 0.000 title claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 115
- 239000010959 steel Substances 0.000 claims abstract description 115
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 239000004033 plastic Substances 0.000 claims description 19
- 229920003023 plastic Polymers 0.000 claims description 19
- 239000002023 wood Substances 0.000 claims description 19
- 210000002268 wool Anatomy 0.000 claims description 19
- 238000005520 cutting process Methods 0.000 claims description 14
- 230000002787 reinforcement Effects 0.000 claims description 6
- 238000011010 flushing procedure Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 description 12
- 239000002689 soil Substances 0.000 description 8
- 238000005266 casting Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000009412 basement excavation Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000015271 coagulation Effects 0.000 description 3
- 238000005345 coagulation Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000003796 beauty Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000009156 water cure Methods 0.000 description 1
Landscapes
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
The utility model is related to a kind of shearing slot structures for underwater concrete back cover, including excavating in the foundation pit on ground, building enclosure is surrounded with around foundation pit, it further include angle steel pair, rebound and pre-buried flush pipe, angle steel is circumferentially positioned on the inside of building enclosure interval, and two angle steel relative spacings setting of angle steel centering, between the upper and lower every being embedded with two rows of anchor bars corresponding with angle steel in building enclosure, anchor bar is stretched out close to one end of angle steel pair after building enclosure to be fixedly connected with corresponding angle steel, between two angle steel that rebound is arranged in angle steel pair, pre-buried flush pipe is arranged in building enclosure, and multiple apopores are equipped with towards rebound to corresponding position with angle steel in pre-buried flush pipe.The shearing slot structure of the utility model so that there is reliable connection between bottom concrete and building enclosure, ensure the watertightness of bottom concrete and the hole huge water pressure in bottom can be born.
Description
Technical field
The utility model is related to underground engineering designs and technical field of construction, more particularly to a kind of underwater concrete that is used for seal
The shearing slot structure at bottom.
Background technology
In the numerous cities in China, generally development has the artesian aquifer and the higher weak soil of water content of multi-layered thickness stabilization
Layer.With the development of urban transportation and the underground space, the excavation of deep big foundation pit has been directed to these layer of position.Residing for foundation pit
Environmental condition becomes increasingly complex, and requires to be increasingly stringenter to the control of foundation pit deformation, therefore in Deep Excavation, not only need
Hole bottom artesian water is punished with prevent it is prominent gush destruction and jeopardize engineering safety, also to avoid pressure-bearing water cure is improper from causing
The outer earth's surface in hole or building enclosure self-deformation is excessive causes damages to periphery buildings or structures.In engineering practice generally use every
Water, decompression or hole bottom reinforce the measures such as back cover or many kinds of measures is used in combination method reduces artesian water water level, realizes base
Dry excavation is cheated to ensure construction safety and quality, and prevents the various environmental problems caused by simple precipitation.Above-mentioned measure pair
Cutting depth is smaller and water seal curtain to completely penetrate through the base pit engineering of artesian aquifer be applicable, had accumulated suitable work already
Journey experience.But big to cutting depth, artesian aquifer thickness and buried depth greatly cause water seal curtain to be difficult to completely penetrate through and hold
The ultra-deep foundation pit engineering that there are extremely sensitive buildings or structures within the scope of pressure water-bearing layer, influence of foundation excavation, is held using aforementioned
Pressure water Disposal Measures and arrangement and method for construction have been difficult to meet requirement of engineering, or even can cause various engineering accidents.At artesian water
Set improper and design mistake it is unreasonable caused by foundation pit accident it is commonplace.
Utility model content
Technical problem to be solved in the utility model is in view of the above shortcomings of the prior art, to provide a kind of for underwater
The shearing slot structure of concrete sealing bottom.
The technical solution that the utility model solves above-mentioned technical problem is as follows：A kind of shearing for underwater concrete back cover
Slot structure, including excavate and be surrounded with the building enclosure being above the ground level around the foundation pit on ground, the foundation pit, further include angle
Steel is to, rebound and pre-buried flush pipe, and the angle steel is circumferentially positioned on the inside of the building enclosure interval, and the angle steel pair
In the setting of two angle steel relative spacings, and the both sides up and down on ground are located at, above and below the building enclosure interior building enclosure
Interval is embedded with two rows of anchor bars corresponding with the angle steel, and the anchor bar stretches out institute close to one end of the angle steel pair
Be fixedly connected with the corresponding angle steel after stating building enclosure, two angle steel that the rebound is arranged in the angle steel pair it
Between, the pre-buried flush pipe is arranged in the building enclosure on the inner wall of the angle steel side, and in the pre-buried flush pipe
Multiple apopores, the pre-buried flush pipe and external high pressure water are equipped with towards the rebound to corresponding position with the angle steel
Source is connected to, and the high pressure water flow sprayed from the apopore can be rinsed cutting process to the rebound.
Before into the foundation pit, casting concrete forms bottom concrete, first by the pre-buried flush pipe and external high pressure
Water source is connected to, and the high pressure water flow sprayed from the apopore is rinsed cutting process to the rebound, waits for the rebound
Into the foundation pit, casting concrete forms bottom concrete again after removing.With pouring for bottom concrete, two institutes
It states and is full of concrete in the region between angle steel, the building enclosure is made to form entirety with the bottom concrete.
The utility model has the beneficial effects that：The shearing slot structure for underwater concrete back cover of the utility model, is adopted
Angle steel pair is designed on the inside of building enclosure, and rebound is internally set to be reserved on the inside of the building enclosure in angle steel
Space, and by being embedded on the outside of building enclosure the anchor bar in soil matrix by the angle steel to further fixing, first by foundation pit
Interior casting concrete simultaneously forms bottom concrete, then again rinses the rebound by pre-buried flush pipe and cuts and remove,
The casting concrete into foundation pit again, and the region between two angle steel of the angle steel centering is full of concrete, it in this way can be with
So that having reliable connection between bottom concrete and building enclosure, ensure the water of building enclosure and bottom concrete joint face
Close property simultaneously can bear the hole huge water pressure in bottom.
Based on the above technical solution, the utility model can also do following improvement：
Further：Several main reinforcements, the angle steel and every main ribs are vertically arranged at intervals on the inside of the building enclosure
It is fixedly connected with.
The advantageous effect of above-mentioned further scheme is：By the way that the angle steel is fixedly connected with main ribs, it is ensured that
The angle steel can obtain firm support, improve the structural strength of shearing slot, and be not in dystopy during construction, protect
The high pressure water flow for demonstrate,proving the apopore outgoing in the pre-buried flush pipe can be by the rebound between the upper and lower angle steel smoothly
Cleaning cutting.
Further：The pre-buried flush pipe is vertically provided between adjacent two main ribs, the pre-buried flush pipe
Top is higher than the top of main ribs, and difference in height between the two is not less than 50cm.
The advantageous effect of above-mentioned further scheme is：By the way that the pre-buried flush pipe is vertically provided at described in adjacent two
Between main reinforcement, adjacent two main ribs can be made to be effectively protected the pre-buried flush pipe, and will not occupy
Extra space, easy for construction, structure is beautiful, by the top that the top of the pre-buried flush pipe is set above to main ribs
End, with facilitate can be in order to which the construction of pre-buried flush pipe, another party can be so that the pre-buried flush pipe interior energy be formed enough
Hydraulic pressure, so that smoothly the rebound is cut.
Further：The pre-buried flush pipe is steel pipe or pvc pipe.
The advantageous effect of above-mentioned further scheme is：Steel pipe or pvc pipe structural strength are larger, can bear larger hydraulic pressure,
High pressure water flow convenient for being emitted from the apopore, which can smoothly rinse the rebound, to be cut and removes, convenient for subsequently applying
Work.
Further：The angle steel is to horizontally disposed, and two angle steel of the angle steel centering and two rows institute
State anchor bar and be symmetricly set on ground both sides up and down, and two rows of anchor bar stretch out one end of the building enclosure with
Two angle steel correspondences of the angle steel centering are welded and fixed.
The advantageous effect of above-mentioned further scheme is：By by two angle steel of the angle steel centering and upper and lower two
Arrange the anchor bar and be symmetricly set on ground both sides up and down, can entirely to shear slot withstand forces it is more balanced, entirely
Structural strength is larger.
Further：The distance between two described angle steel of the angle steel centering are no more than the bottoming concrete thickness
Half.
The advantageous effect of above-mentioned further scheme is：Between two angle steel by controlling the angle steel centering away from
From the half no more than the bottoming concrete thickness, it is ensured that the intensity of entire bottom concrete so that back cover is mixed
Solidifying soil coordinates the angle steel and anchor bar preferably to support the building enclosure.
Further：The rebound includes wood wool board and/or plastic foamboard, and the wood wool board and/or foamed plastics
The plate angle steel corresponding with upper and lower both sides is fixedly connected.
The advantageous effect of above-mentioned further scheme is：Wood wool board and plastic foamboard light weight, density ratio water are small, pass through height
It forms powder after pressure flow flushing cutting and swims in the water surface and flow away, can make to rinse cutting by institute by high pressure water flow in this way
It states wood wool board and/or plastic foamboard is removed totally, be convenient for subsequent construction.
Description of the drawings
Fig. 1 is the structural schematic diagram of the shearing slot structure for underwater concrete back cover of the utility model；
Fig. 2 is the Section A-A schematic diagram of Fig. 1；
Fig. 3 is the section B-B schematic diagram of Fig. 2；
Fig. 4 is the pre-buried flush pipe structural schematic diagram of the utility model.
In attached drawing, parts list represented by the reference numerals are as follows：
1, building enclosure, 2, angle steel pair, 3, rebound, 4, pre-buried flush pipe, 5, anchor bar, 6, bottom concrete；
11, main reinforcement, 21, angle steel, 31, wood wool board, 32, plastic foamboard.
Specific implementation mode
The principles of the present invention and feature are described below in conjunction with attached drawing, example is served only for explaining this practicality
It is novel, it is not intended to limit the scope of the utility model.
As shown in Figure 1, Figure 2, Figure 3 and Figure 4, a kind of shearing slot structure for underwater concrete back cover, including excavate in
The foundation pit on ground is surrounded with the building enclosure 1 being above the ground level around the foundation pit, further includes angle steel pair 2,3 and of rebound
More pre-buried flush pipes 4, the interval of the angle steel pair 2 are circumferentially positioned at 1 inside of the building enclosure, and in the angle steel pair 2
Two 21 relative spacing of angle steel settings, and the both sides up and down on ground are located at, 1 about 1 interior building enclosure of the building enclosure
Interval is embedded with two rows of anchor bars 5 corresponding with the angle steel 21, and the anchor bar 5 is close to one end of the angle steel pair 2
It is fixedly connected with the corresponding angle steel 21 after stretching out the building enclosure 1, the rebound 3 is arranged in the angle steel pair 1
Two angle steel 21 between, the pre-buried flush pipe 4 is arranged in the building enclosure 1 on 21 side inner wall of the angle steel,
And multiple apopores 41, institute are equipped with towards the rebound 3 in the pre-buried flush pipe 4 with 2 corresponding position of the angle steel pair
It states pre-buried flush pipe 4 to be connected to external high pressure water source, and the high pressure water flow sprayed from the apopore 41 can be to the rebound 3
It is rinsed cutting process.
It is first that the pre-buried flush pipe 4 and outside is high before into the foundation pit, casting concrete forms bottom concrete 6
Water source connection is pressed, the high pressure water flow sprayed from the apopore 41 is rinsed cutting process to the rebound 3, waits for the mistake
The removing of cab apron 3 finishes, then the casting concrete into the foundation pit forms bottom concrete 6, with pouring for bottom concrete 6,
It is full of concrete in region between two angle steel 21, so that the building enclosure 1 is formed with the bottom concrete 6 whole
Body.
The shearing slot structure for underwater concrete back cover of the utility model designs angle using in 1 inside of building enclosure
Steel pair 2, and rebound 3 is set so that 1 inside of the building enclosure is reserved space, and by being embedded in angle steel pair 2
Anchor bar 5 in 1 outside soil matrix of building enclosure further fixes the angle steel pair 2, and coagulation is being poured into the foundation pit
Before soil forms bottom concrete 6, first the pre-buried flush pipe 4 is connected to external high pressure water source, is sprayed from the apopore 41
High pressure water flow cutting process is rinsed to the rebound 3, wait for after the rebound 3 is removed again into the foundation pit
Casting concrete forms bottom concrete 6.With pouring for bottom concrete 6, filled in the region between two angle steel
Full concrete, makes the building enclosure 1 form entirety with the bottom concrete 6, can make bottom concrete 6 in this way and enclose
There is reliable connection between protection structure 1, ensure the watertightness of bottom concrete 6 and the hole huge water pressure in bottom can be born.
In the above-described embodiments, the inside of the building enclosure 1 is vertically arranged at intervals with several main reinforcements 11, the angle steel 21 with
Every main ribs 11 are fixedly connected with.By the way that the angle steel 21 is fixedly connected with every main ribs 11, it is ensured that institute
Firm support can be obtained by stating angle steel 21, improved the structural strength of shearing slot, and be not in dystopy during construction, protected
The high pressure water flow for demonstrate,proving the outgoing of apopore 41 in the pre-buried flush pipe 4 can be by the rebound 3 between the upper and lower angle steel 21
Smoothly cleaning cutting.
In practice, the quantity of main ribs 11 and density of setting (or interval) need to be according to excavation of foundation pit depth and Rock And Soil objects
It manages mechanical property and calculates determination, also need two angle steel in the thickness and the angle steel pair 2 according to bottom concrete 6
The distance between 21 are adjusted.
Preferably, in the above-described embodiments, the pre-buried flush pipe 4 be vertically provided at adjacent two main ribs 11 it
Between.Between the pre-buried flush pipe 4 is vertically provided at adjacent two main ribs 11, it can make described in adjacent two
Main reinforcement 11 is effectively protected the pre-buried flush pipe 4, and will not occupy extra space, easy for construction, architectonic beauty
It sees.
It should be pointed out that in practice, the quantity of the pre-buried flush pipe 4 can also be according to the bottom concrete 6
The distance between two described angle steel 21 in thickness and the angle steel pair 2 are adjusted.For example, adjacent two pre-buried punchings
Setting one, two can be spaced or more with main ribs 11 by washing between pipe 4.
It is highly preferred that in the above-described embodiments, the top of the pre-buried flush pipe 4 is higher than the top of main ribs 11, and
Difference in height between the two is not less than 50cm.By the way that the top of the pre-buried flush pipe 4 is set above main ribs 11
Top, with facilitate can be in order to which the construction of pre-buried flush pipe 4, another party can be so that 4 interior energy of pre-buried flush pipe be formed
Enough hydraulic pressure, smoothly to cut the rebound 3.
In the utility model embodiment, the pre-buried flush pipe 4 is steel pipe or pvc pipe.Steel pipe or pvc pipe structural strength compared with
Greatly, larger hydraulic pressure can be born, the high pressure water flow convenient for being emitted from the apopore 41 can smoothly rinse the rebound 3
It cuts and removes, be convenient for subsequent construction.
Preferably, in the above-described embodiments, the angle steel pair 2 is horizontally disposed, and two angles in the angle steel pair 2
Anchor bar 5 described in steel 21 and two rows is symmetricly set on ground both sides up and down, and two rows of anchor bars 5 stretch out
One end of the building enclosure 1 is corresponding with two angle steel 21 in the angle steel pair 2 to be welded and fixed.By by the angle steel
Ground or more both sides are symmetricly set on to anchor bar 5 described in two angle steel 21 and two rows in 2, can be made
Entirely shearing slot endurance it is more balanced, total intensity is larger.
It is highly preferred that in the above-described embodiments, the specific setting quantity of angle steel pair 2 and rebound 3 can be according to back cover coagulation
The thickness of soil 6 carries out calculating determination.In general, the distance between two angle steel 21 in the angle steel pair 2 are not more than institute
State the half of 6 thickness of bottom concrete.By controlling the distance between two described angle steel 21 in the angle steel pair 2 no
More than the half of 6 thickness of the bottom concrete, it is ensured that the intensity of entire bottom concrete 6 so that back cover coagulation
6 cooperation of the soil angle steel 21 and anchor bar 5 preferably support the building enclosure 1.
In the embodiments of the present invention, the rebound 3 preferably includes wood wool board 31 and/or plastic foamboard 32, and
The wood wool board 31 and/or corresponding with the upper and lower both sides angle steel of plastic foamboard 32 21 are fixedly connected.When the rebound 3
For wood wool board 31 or plastic foamboard 32 when, the quantity of the wood wool board 31 or plastic foamboard 32 can be one piece can or it is more
Block, and when the wood wool board 31 or plastic foamboard 32 are polylith, inside and outside wood wool board 31 or plastic foamboard 32 described in polylith
Be bonded between two angle steel 21 being arranged in the angle steel pair 1, and polylith wood wool board 31 or plastic foamboard 32 with up and down
The corresponding angle steel in both sides 21 is fixedly connected.When the rebound 3 is wood wool board 31 and plastic foamboard 32, the wood wool
Between two angle steel 21 that plate 31 and the inside and outside fitting of the plastic foamboard 32 are arranged in the angle steel pair 1, and the wood wool
Plate 31 and the plastic foamboard 32 corresponding with the upper and lower both sides angle steel 21 are fixedly connected.Wood wool board 31 and foamed plastics
32 light weight of plate, density ratio water are small, are rinsed after cutting by high pressure water flow and form powder and swim in the water surface and flow away, in this way can be with
The wood wool board 31 and/or plastic foamboard 32 are removed totally so that rinsing cutting by high pressure water flow, are convenient for subsequent construction.
The above is only the preferred embodiment of the present invention, is not intended to limit the utility model, all in this practicality
Within novel spirit and principle, any modification, equivalent replacement, improvement and so on should be included in the guarantor of the utility model
Within the scope of shield.
Claims (7)
1. a kind of shearing slot structure for underwater concrete back cover, including excavate the ring around the foundation pit on ground, the foundation pit
It is provided around the building enclosure (1) being above the ground level, it is characterised in that:Further include that angle steel is pre-buried to (2), rebound (3) and more
Flush pipe (4), the angle steel is circumferentially positioned on the inside of the building enclosure (1) (2) interval, and the angle steel is in (2)
Relative spacing is arranged two angle steel (21) up and down, and is located at the both sides up and down on ground, in the building enclosure (1) between the upper and lower
Every being embedded with two rows of anchor bars (5) corresponding with the angle steel (21), the anchor bar (5) is close to the angle steel to (2)
One end stretch out the building enclosure (1) and be fixedly connected afterwards with the corresponding angle steel (21), the rebound (3) is arranged in institute
Angle steel is stated between two angle steel (21) in (1), pre-buried flush pipe (4) setting is in the building enclosure (1) close to institute
State on the inner wall of angle steel (21) side, and in the pre-buried flush pipe (4) with the angle steel to (2) corresponding position towards the mistake
Cab apron (3) is equipped with multiple apopores (41), and the pre-buried flush pipe (4) is connected to external high pressure water source, and from the apopore
(41) high pressure water flow sprayed can be rinsed cutting process to the rebound (3).
2. being used for the shearing slot structure of underwater concrete back cover according to claim 1, it is characterised in that:The building enclosure
(1) inside is vertically arranged at intervals with several main reinforcements (11), and the angle steel (21) is fixedly connected with every main ribs (11).
3. being used for the shearing slot structure of underwater concrete back cover according to claim 2, it is characterised in that:The pre-buried flushing
Pipe (4) is vertically provided between adjacent two main ribs (11), and the top of the pre-buried flush pipe (4) is higher than main ribs
(11) top, and difference in height between the two is not less than 50cm.
4. being used for the shearing slot structure of underwater concrete back cover according to claim 3, it is characterised in that:The pre-buried flushing
It is steel pipe or pvc pipe to manage (4).
5. being used for the shearing slot structure of underwater concrete back cover according to claim 1, it is characterised in that:The angle steel pair
(2) be horizontally disposed with, and the angle steel in (2) two angle steel (21) and two rows described in anchor bar (5) it is equal
Ground both sides up and down are symmetricly set on, and two rows of anchor bars (5) stretch out one end of the building enclosure (1) and the angle
Steel is welded and fixed two angle steel (21) correspondences in (2).
6. being used for the shearing slot structure of underwater concrete back cover according to claim 5, it is characterised in that:The angle steel pair
(2) the distance between two described angle steel (21) in are not more than the half of the bottom concrete (6) thickness.
7. according to the shearing slot structure for being used for underwater concrete back cover described in any one of claim 1 to 6, it is characterised in that:Institute
It includes wood wool board (31) and/or plastic foamboard (32) to state rebound (3), and the wood wool board (31) and/or plastic foamboard
(32) angle steel (21) corresponding with upper and lower both sides is fixedly connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820438855.6U CN208056066U (en) | 2018-03-29 | 2018-03-29 | A kind of shearing slot structure for underwater concrete back cover |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820438855.6U CN208056066U (en) | 2018-03-29 | 2018-03-29 | A kind of shearing slot structure for underwater concrete back cover |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208056066U true CN208056066U (en) | 2018-11-06 |
Family
ID=63986450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820438855.6U Expired - Fee Related CN208056066U (en) | 2018-03-29 | 2018-03-29 | A kind of shearing slot structure for underwater concrete back cover |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208056066U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108301414A (en) * | 2018-03-29 | 2018-07-20 | 武汉市政工程设计研究院有限责任公司 | A kind of shearing slot structure and its construction method for underwater concrete back cover |
-
2018
- 2018-03-29 CN CN201820438855.6U patent/CN208056066U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108301414A (en) * | 2018-03-29 | 2018-07-20 | 武汉市政工程设计研究院有限责任公司 | A kind of shearing slot structure and its construction method for underwater concrete back cover |
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Granted publication date: 20181106 |