CN110656657A - Compressor foundation bolt installation method - Google Patents
Compressor foundation bolt installation method Download PDFInfo
- Publication number
- CN110656657A CN110656657A CN201911058496.7A CN201911058496A CN110656657A CN 110656657 A CN110656657 A CN 110656657A CN 201911058496 A CN201911058496 A CN 201911058496A CN 110656657 A CN110656657 A CN 110656657A
- Authority
- CN
- China
- Prior art keywords
- foundation
- bolt
- sleeve
- compressor
- frame
- 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
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/44—Foundations for machines, engines or ordnance
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/20—Miscellaneous comprising details of connection between elements
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Foundations (AREA)
Abstract
The invention relates to a method for installing foundation bolts of a compressor foundation, which is characterized in that a scaffold frame is erected at the accurate position where the compressor is to be installed, and a foundation template and a steel reinforcement framework are installed; manufacturing a frame wooden template and a wooden cushion block for positioning and fixing the foundation bolt according to the pay-off position and the position of a fixing hole at the bottom of the compressor, enabling the upper part of the bolt of the foundation bolt to penetrate through vertical through holes of the frame wooden template and the wooden cushion block and fixing the bolt, clamping a sleeve at the lower part of the foundation bolt and a channel steel vertically arranged around the sleeve and welding and fixing the sleeve, welding and fixing the channel steel and a scaffold frame at the same time, and pouring concrete to the lower part of the frame wooden template; after the foundation is completely solidified, removing the frame wood template and the wood cushion block; and (3) completely installing the compressor on the foundation, and finally grouting between the compressor and the foundation. The installation method provided by the invention can ensure that the foundation bolts can be accurately and conveniently installed under the condition that the number of the foundation bolts is large.
Description
Technical Field
The invention relates to an installation method of an anchor bolt, in particular to an anchor bolt for installing a compressor foundation and an installation structure thereof.
Background
The compressor is widely applied to the fields of chemical industry and petrochemical industry. The base of the compressor (as shown in figure 1) is different from the building base and will be subjected to static and dynamic loads. Because of the dynamic nature of the load and the elasticity of the soil, the specifications and data for designing building foundations cannot be used for compressor foundations. Therefore, much lower soil bearing capacities than those specified for urban construction should be used, typically one quarter to one third of their value. The low soil bearing capacity makes the natural frequency of the foundation higher, prevents resonance and reduces the possibility of transmitting vibration. If the compressor foundation is designed to ignore these factors, the weight of the foundation and the elasticity of the soil may add up, creating a natural frequency that, if within the compressor operating frequency range, would result in extreme movement of the foundation.
Typically the size of the compressor cylinder and the weight of the reciprocating components are determined by the operational process requirements and compressor characteristics. It is often impractical for the inertial forces of compressor operation to be fully balanced by itself. The design of the compressor base is therefore intended to absorb unbalanced forces and moments to reduce any vibrations.
The compressor is installed on the foundation and foundation, and the foundation and foundation are used for absorbing unbalanced force and moment of the compressor and conducting the unbalanced force and moment into soil, and the alignment and assembly gaps of the parts of the compressor unit are kept. Without a good foundation, the centering and assembly clearance of each part of the compressor set cannot be kept, and problems can occur, which affect the safe operation of the compressor.
All pre-buried rag bolt in the compressor basis usually, rag bolt's kind has a lot of, links to each other compressor unit and basis through rag bolt. In practice, the sleeve is embedded during foundation construction, and the anchor bolt with the anchor plate is inserted when the compressor is installed. In order to have great accommodation space, make things convenient for the alignment of compressor, the diameter of rag bolt sleeve pipe selection is great, and the area of contact of rag bolt anchor slab and basis can reduce, and the anchor slab is direct to be in contact with the concrete face, and effective area of contact is less, and it is also comparatively difficult to adjust mounted position, and in addition, under the more condition of rag bolt quantity, rag bolt sets up the position and highly all more difficult control of top and basis, leads to the fact certain degree of difficulty for the construction.
Disclosure of Invention
The invention aims to provide a method for installing foundation bolts of a compressor foundation, so that the installation precision and the construction efficiency are improved.
In order to solve the technical problems, the invention adopts the technical scheme that: a method for installing foundation bolts of a compressor foundation comprises the following steps:
firstly, measuring and paying off before construction, erecting a scaffold frame at an accurate position where a compressor is to be installed, and installing a basic template and a steel reinforcement framework;
manufacturing a frame wooden template and a wooden cushion block for positioning and fixing the foundation bolt according to the paying-off position and the position of the fixing hole at the bottom of the compressor, wherein the frame wooden template comprises a transverse wooden template and a vertical wooden template, and vertical through holes are correspondingly formed in the wooden cushion block and the frame wooden template;
the foundation bolt comprises a bolt, a sleeve, an inner anchor plate and a steel box, the inner anchor plate is fixed at the middle lower part of the bolt, the sleeve comprises a first sleeve and a second sleeve, the upper surface and the lower surface of the steel box are respectively connected with the first sleeve and the second sleeve, and the inner cavity of the steel box is communicated with the inner cavities of the first sleeve and the second sleeve; the inner anchor plate is arranged in the steel box, and the upper part and the lower part of the bolt are respectively arranged in the first sleeve and the second sleeve;
the upper part of a bolt of the foundation bolt penetrates through vertical through holes of a frame wooden template and a wooden cushion block, so that the top of the bolt exceeds a pipe orifice at the upper part of the sleeve and is fixed by a third bolt; after each foundation bolt sleeve is aligned, clamping and welding and fixing the sleeve at the lower part of the foundation bolt and a channel steel vertically arranged around the sleeve, and welding and fixing the channel steel and a scaffold frame at the same time;
checking the positions and heights of all foundation bolts, plugging pipe orifices at the upper part of the sleeve, and pouring concrete to the lower part of the frame wood formwork;
curing after the pouring is finished to prevent cracks from being generated by the over-fast curing of the basic concrete;
fifthly, after the foundation is completely solidified, dismantling the frame wood formwork and the wood cushion block;
cutting off a floating slurry layer with the thickness of at least 13mm on the surface of the foundation, and thoroughly cleaning mortar, foam and floating dust on the foundation;
removing the sealing material of the pipe orifice at the upper part of the pipe sleeve, removing dirt, waste and moisture in the pipe sleeve, and finally plugging the top of the pipe sleeve again;
and step eight, before the compressor is hoisted to the foundation, measuring the distance between the foundation bolts to ensure that the foundation bolts are aligned and smoothly enter bolt holes of a frame of the compressor, after leveling, completely installing the compressor on the foundation, and finally grouting between the compressor and the foundation.
Preferably, in the fourth step, the cotton quilt is covered by water and the watering maintenance is adhered or the plastic cloth is wetted and covered.
Preferably, first sleeve pipe top pass is equipped with the screw thread protective sheath, screw thread protective sheath lateral surface and the cooperation of first sleeve pipe inner wall contact, screw thread protective sheath middle part and bolted connection connect first nut on the bolt of screw thread protective sheath top.
Preferably, the middle part of the inner anchor plate is connected with the threads at the lower part of the bolt, and the bolt below the inner anchor plate is connected with a second nut.
Preferably, the wood cushion blocks are arranged on the tops of the transverse wood formworks.
The installation method provided by the invention can ensure that the foundation bolts can be accurately and conveniently installed under the condition that the number of the foundation bolts is large. The sleeve sealed foundation bolt is adopted, the bolt and the sleeve are integrated, and the sleeve sealed foundation bolt is embedded into the foundation during foundation construction, so that the effective contact area of the foundation bolt and concrete is increased. The position adjustment is carried out by utilizing the gap between the bolt and the sleeve, the mounting precision and the construction efficiency are improved, the foundation bolt can be recycled, the cost is greatly saved, and the waste is reduced. The installation is simple saves time, can show to reduce rag bolt civil engineering construction degree of difficulty, reduces installation construction cost.
Drawings
Fig. 1 is a schematic view of a compressor base.
FIG. 2 is a schematic view showing the construction of a foundation bolt for a compressor according to the present invention.
Fig. 3 is a schematic view of an upper reinforcement structure according to the present invention.
Fig. 4 is a schematic view of an upper reinforcing structure and a lower reinforcing structure according to the present invention.
FIG. 5 is a schematic view of the foundation bolt of the present invention after the compressor foundation is poured.
In the figure, 1-bolt, 2-inner anchor plate, 3-steel box, 4-first sleeve, 5-second sleeve, 6-thread protective sleeve, 7-first nut, 8-second nut, 9-frame wood formwork, 10-wood cushion block, 11-third nut, 12-scaffold frame and 13-channel steel.
Detailed Description
The embodiment provides a compressor foundation bolt installation method, which comprises the following steps:
firstly, measuring and paying off before construction, erecting a scaffold frame at an accurate position where a compressor is to be installed, and installing a basic template and a steel reinforcement framework;
manufacturing a frame wooden template and a wooden cushion block for positioning and fixing the foundation bolt according to the paying-off position and the position of the fixing hole at the bottom of the compressor, wherein the frame wooden template comprises a transverse wooden template and a vertical wooden template, and vertical through holes are correspondingly formed in the wooden cushion block and the frame wooden template;
the foundation bolt comprises a bolt 1, a sleeve, an inner anchor plate 2 and a steel box 3, the inner anchor plate 2 is fixed at the middle lower part of the bolt 1, the sleeve comprises a first sleeve 4 and a second sleeve 5, the upper surface and the lower surface of the steel box 3 are respectively connected with the first sleeve 4 and the second sleeve 5, and the inner cavity of the steel box 3 is communicated with the inner cavities of the first sleeve 4 and the second sleeve 5; the inner anchor plate 2 is placed inside the steel box 3 and the upper and lower part of the bolt 1 is placed inside the first and second sleeves 4 and 5, respectively.
The bolt 1 is a stud bolt, and the upper part and the lower part of the stud bolt are both provided with threads. Certain adjustable clearance all exists between bolt and sleeve pipe and the steel box, and the sheathed tube diameter is less, and interior anchor plate 2 is great and contact well with 3 upper surface contact areas of steel box.
Be equipped with screw thread protective sheath 6 in the mouth of pipe of first sleeve 4 top, 6 lateral surfaces of screw thread protective sheath and the cooperation of the contact of 4 inner walls of first sleeve, 6 middle parts of screw thread protective sheath are connected with bolt 1, connect first nut 7 on the bolt 1 of 6 tops of screw thread protective sheath. The thread protective sleeve 6 can protect the threads of the bolt from being damaged, and the overall reliability of the local foot bolt is improved. The middle part of the inner anchor plate 2 is connected with the thread at the lower part of the bolt 1, and the bolt 1 below the inner anchor plate 2 is connected with a second nut 8. Interior anchor slab 2 is installed in steel box 3 in advance, can select suitable interior anchor slab 2 size as required during the preparation to control its area of contact with steel box 4 upper surface, thereby increased rag bolt's fixity on the whole.
The upper part of a bolt of the foundation bolt penetrates through a transverse wooden template and a vertical through hole of a wooden cushion block, so that the top of the bolt exceeds a pipe orifice at the upper part of the sleeve and is fixed by a third bolt; after the alignment of each foundation bolt sleeve, the sleeve at the lower part of the foundation bolt and the channel steel vertically arranged around the sleeve are clamped and welded and fixed, and the channel steel is welded and fixed with the scaffold frame.
In the embodiment, the foundation bolt sleeve is reinforced by upper and lower layers after being aligned. The upper reinforcing structure comprises a frame timber formwork 9 and timber spacer blocks 10 and the lower reinforcing structure comprises a scaffold frame 12 and a channel 13 vertically disposed around the casing. The frame wooden mold plate 9 mainly plays a role in accurately positioning the anchor bolts. And arranging a wood cushion block on the upper part of the transverse wood formwork to enable the top of the foundation bolt to be within a necessary distance above the foundation. The sleeve pipe lower part is pressed from both sides tightly and is firm with the sleeve pipe welding with the channel-section steel, and the channel-section steel all welds the jail with the scaffold frame, waters in the concrete after channel-section steel and the scaffold frame of reinforcement usefulness, does not take out.
Checking the positions and heights of all foundation bolts, plugging pipe orifices at the upper part of the sleeve, and pouring concrete to the lower part of the frame wood formwork;
curing after the pouring is finished to prevent cracks from being generated by the over-fast curing of the basic concrete; preferably, the cotton is covered with water and maintained by watering or by wetting and covering with plastic cloth.
Fifthly, after the foundation is completely solidified, dismantling the frame wood formwork and the wood cushion block;
cutting off a floating slurry layer with the thickness of at least 13mm on the surface of the foundation, and thoroughly cleaning mortar, foam and floating dust on the foundation;
removing the sealing material of the pipe orifice at the upper part of the pipe sleeve, removing dirt, waste and moisture in the pipe sleeve, and finally plugging the top of the pipe sleeve again;
and step eight, before the compressor is hoisted to the foundation, measuring the distance between the foundation bolts to ensure that the foundation bolts are aligned and smoothly enter bolt holes of a frame of the compressor, after leveling, completely installing the compressor on the foundation, and finally grouting between the compressor and the foundation.
When the mounted position according to the compressor basis carries out the laying-out, rag bolt's location alignment uses the sleeve pipe center as the standard, and rag bolt's arrangement must guarantee perpendicularly, and the straightness error that hangs down is not more than 1/1000, can adopt the magnetic force line weight to carry out the straightness inspection control that hangs down to rag bolt. When the anchor bolt fixing device is used, fixing needs to be performed twice, the anchor bolt is fixed by concrete poured for the first time, certain adjustable gaps exist among the bolt, the sleeve and the steel box 3, and the bolt is not in contact with the concrete poured for the first time, so that position adjustment in a small range can be performed. And then further adjusting the relative position of the bolt according to the accurate fixing position of the compressor foundation, fixing the foundation bolt and the compressor, and finally performing secondary grouting fixing between the compressor and the foundation.
The anchor bolts are surrounded by a sleeve leaving a gap between them, and after the foundation concrete has cured, the bolts can also undergo some lateral movement due to a slight offset between the bolts and the small holes in the compressor base. The top of these sleeves should be flush with the surface of the underlying grout line. And sealing two ends of the sleeve around the bolt during pouring to prevent foreign matters from entering the sleeve after the foundation is finished. The seal of the sleeve is removed before the compressor is mounted on the base. The foundation bolt sleeve is ensured to be free of water, and foundation cracking caused by corrosion of the foundation bolt in the sleeve or icing in a cold area due to water is prevented.
According to the invention, through fixing construction twice and utilizing the gap between the bolt and the sleeve to adjust the position, the mounting precision and the construction efficiency are greatly improved, the foundation bolt can be recycled, the cost is greatly saved, and the waste is reduced.
The sleeve sealing type foundation bolt is adopted, so that the mounting is simple and time-saving, the foundation bolt civil engineering construction difficulty can be obviously reduced, and the mounting construction cost is reduced. The bolt has a retractable function, namely the foundation bolt can be retracted into the ground before equipment is installed, so that the bolt is simply and conveniently aligned with the bolt hole of the equipment base during equipment installation, the equipment installation difficulty is obviously reduced, quick installation is realized, the equipment is very convenient to disassemble and assemble particularly during the remote reconstruction of a large-scale factory, and the cost is obviously saved; the detached screw can be continuously recycled, and the difficulty and cost of the large-scale equipment in remote transformation are greatly reduced.
Claims (5)
1. A method for installing foundation bolts of a compressor foundation is characterized by comprising the following steps:
firstly, measuring and paying off before construction, erecting a scaffold frame at an accurate position where a compressor is to be installed, and installing a basic template and a steel reinforcement framework;
manufacturing a frame wooden template and a wooden cushion block for positioning and fixing the foundation bolt according to the paying-off position and the position of the fixing hole at the bottom of the compressor, wherein the frame wooden template comprises a transverse wooden template and a vertical wooden template, and vertical through holes are correspondingly formed in the wooden cushion block and the frame wooden template;
the foundation bolt comprises a bolt, a sleeve, an inner anchor plate and a steel box, the inner anchor plate is fixed at the middle lower part of the bolt, the sleeve comprises a first sleeve and a second sleeve, the upper surface and the lower surface of the steel box are respectively connected with the first sleeve and the second sleeve, and the inner cavity of the steel box is communicated with the inner cavities of the first sleeve and the second sleeve; the inner anchor plate is arranged in the steel box, and the upper part and the lower part of the bolt are respectively arranged in the first sleeve and the second sleeve;
the upper part of a bolt of the foundation bolt penetrates through vertical through holes of a frame wooden template and a wooden cushion block, so that the top of the bolt exceeds a pipe orifice at the upper part of the sleeve and is fixed by a third bolt; after each foundation bolt sleeve is aligned, clamping and welding and fixing the sleeve at the lower part of the foundation bolt and a channel steel vertically arranged around the sleeve, and welding and fixing the channel steel and a scaffold frame at the same time;
checking the positions and heights of all foundation bolts, plugging pipe orifices at the upper part of the sleeve, and pouring concrete to the lower part of the frame wood formwork;
curing after the pouring is finished to prevent cracks from being generated by the over-fast curing of the basic concrete;
fifthly, after the foundation is completely solidified, dismantling the frame wood formwork and the wood cushion block;
cutting off a floating slurry layer with the thickness of at least 13mm on the surface of the foundation, and thoroughly cleaning mortar, foam and floating dust on the foundation;
removing the sealing material of the pipe orifice at the upper part of the pipe sleeve, removing dirt, waste and moisture in the pipe sleeve, and finally plugging the top of the pipe sleeve again;
and step eight, before the compressor is hoisted to the foundation, measuring the distance between the foundation bolts to ensure that the foundation bolts are aligned and smoothly enter bolt holes of a frame of the compressor, after leveling, completely installing the compressor on the foundation, and finally grouting between the compressor and the foundation.
2. The compressor foundation anchor bolt installing method of claim 1, wherein: and step four, covering the cotton quilt with water, and maintaining by watering or maintaining by wetting and covering a plastic cloth.
3. The compressor foundation anchor bolt installing method according to claim 1 or 2, wherein: first sleeve pipe top pass is equipped with the screw thread protective sheath, screw thread protective sheath lateral surface and the cooperation of first sleeve pipe inner wall contact, screw thread protective sheath middle part and bolted connection connect first nut on the bolt of screw thread protective sheath top.
4. The compressor foundation anchor bolt installing method of claim 3, wherein: the middle part of the inner anchor plate is connected with the lower part of the bolt through threads, and the bolt below the inner anchor plate is connected with a second nut.
5. The compressor foundation anchor bolt installing method of claim 4, wherein: the top of the transverse wood formwork is provided with the wood cushion block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911058496.7A CN110656657A (en) | 2019-11-01 | 2019-11-01 | Compressor foundation bolt installation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911058496.7A CN110656657A (en) | 2019-11-01 | 2019-11-01 | Compressor foundation bolt installation method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110656657A true CN110656657A (en) | 2020-01-07 |
Family
ID=69042559
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911058496.7A Pending CN110656657A (en) | 2019-11-01 | 2019-11-01 | Compressor foundation bolt installation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110656657A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113293859A (en) * | 2021-04-21 | 2021-08-24 | 中国化学工程第三建设有限公司 | Recyclable foundation bolt group pre-embedding positioning device and method |
| JP2021195743A (en) * | 2020-06-10 | 2021-12-27 | 学校法人近畿大学 | Connection structure of wooden member |
| CN114809066A (en) * | 2022-04-15 | 2022-07-29 | 北京建工集团有限责任公司 | Annular positioning device and positioning method for mounting foundation bolt of large-diameter steel column |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102747744A (en) * | 2011-04-19 | 2012-10-24 | 中国水电顾问集团贵阳勘测设计研究院 | Setting method and structure of embedded bolt of strongly-vibrating large electromechanical equipment |
| CN103590416A (en) * | 2013-11-01 | 2014-02-19 | 浙江水利水电学院 | Pre-buried construction method for high-precision foundation bolts |
-
2019
- 2019-11-01 CN CN201911058496.7A patent/CN110656657A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102747744A (en) * | 2011-04-19 | 2012-10-24 | 中国水电顾问集团贵阳勘测设计研究院 | Setting method and structure of embedded bolt of strongly-vibrating large electromechanical equipment |
| CN103590416A (en) * | 2013-11-01 | 2014-02-19 | 浙江水利水电学院 | Pre-buried construction method for high-precision foundation bolts |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2021195743A (en) * | 2020-06-10 | 2021-12-27 | 学校法人近畿大学 | Connection structure of wooden member |
| JP7315151B2 (en) | 2020-06-10 | 2023-07-26 | 学校法人近畿大学 | About the connection structure of wooden members |
| CN113293859A (en) * | 2021-04-21 | 2021-08-24 | 中国化学工程第三建设有限公司 | Recyclable foundation bolt group pre-embedding positioning device and method |
| CN114809066A (en) * | 2022-04-15 | 2022-07-29 | 北京建工集团有限责任公司 | Annular positioning device and positioning method for mounting foundation bolt of large-diameter steel column |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20120011801A1 (en) | Method of producing a tower foundation and tower adapter | |
| CN110656657A (en) | Compressor foundation bolt installation method | |
| KR100837608B1 (en) | J.K Bracket Method | |
| JP2007527971A (en) | How to set up a tower | |
| KR101870309B1 (en) | Aseismatic Reinforcement Steel Frame Structure and Aseismatic Reinforcement Method using thereof | |
| CN113605771B (en) | Prestress assembly type frame structure system | |
| CN108643207B (en) | Device for connecting side plate and bottom plate of bottom sealing-free concrete steel hanging box and construction method thereof | |
| CN201567584U (en) | Prefabricated construction reinforced concrete cushion cap foundation | |
| CN204112525U (en) | Band perps precast shear wall structure in strong concrete precast frame | |
| CN110468727B (en) | Temporary prestress tensioning pedestal and lifting point integrated structure of segmental beam and construction method | |
| KR101401057B1 (en) | Method to build underground structures using the pillars and the stigma and steel beam and slab structures are formed | |
| CN108678416B (en) | Assembled underground storey-adding vibration-isolating structure and storey-adding vibration-isolating construction process | |
| CN108755394B (en) | Method for reinforcing special-shaped pier column of bridge by using prestressed tendons | |
| CN110700332A (en) | Existing building reinforcing pile foundation static load test counterforce device and test method thereof | |
| CN112878712A (en) | Compression shear foundation bolt pre-embedding installation device and construction method thereof | |
| CN110725349B (en) | Bearing platform replacement construction device and method for high-speed rail station canopy column | |
| CN211200447U (en) | Compressor foundation bolt and mounting structure thereof | |
| CN115807508A (en) | Construction method and node for building steel structure column base installation foundation | |
| CN104711981A (en) | Foundation pit soil nail retaining and protecting structure and method | |
| KR101415867B1 (en) | Precast concrete structure construction method for downward construction of underground structures | |
| CN204626398U (en) | A kind of foundation pit soil nailing structure | |
| CN114152242A (en) | Dam horizontal displacement monitoring vertical line protection pipe pre-embedding construction method | |
| CN209907886U (en) | Adjustable assembled stair construction platform | |
| CN113047327A (en) | Multi-connected-cylinder rectangular assembled well wall structure and assembling method thereof | |
| CN115478548B (en) | Expansion soil cutting side slope expansion-reducing anti-seismic disaster-preventing combined retaining structure and construction method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200107 |