CN218000641U - Structure for quickly installing steel water delivery pipeline in concrete pipeline - Google Patents
Structure for quickly installing steel water delivery pipeline in concrete pipeline Download PDFInfo
- Publication number
- CN218000641U CN218000641U CN202221321735.0U CN202221321735U CN218000641U CN 218000641 U CN218000641 U CN 218000641U CN 202221321735 U CN202221321735 U CN 202221321735U CN 218000641 U CN218000641 U CN 218000641U
- Authority
- CN
- China
- Prior art keywords
- steel water
- pipeline
- concrete
- pipe
- steel
- 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.)
- Active
Links
Images
Landscapes
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The utility model discloses a structure for quickly installing a steel water delivery pipeline in a concrete pipeline, which comprises a concrete sleeve and a steel water delivery pipe, wherein the periphery of the steel water delivery pipe is provided with a plurality of supporting rolling parts, and rolling parts of the supporting rolling parts are respectively abutted against the inner periphery of the concrete sleeve; the inner periphery of the concrete sleeve is provided with a floating support assembly, the floating support assembly and the support rolling piece are respectively arranged on the upper side and the lower side of the axis, and a gap is formed between the floating support assembly and the outer periphery of the steel water pipe; and a grouting pipeline is also arranged in the floating support assembly, and slurry is filled between the steel water delivery pipe and the concrete sleeve. Through the arrangement of the installation structure, the installation and construction efficiency of the steel water delivery pipe in the concrete sleeve can be improved, meanwhile, the damage to the steel water delivery pipe in the pipe penetrating construction process is reduced, and the problem of overlarge coaxiality deviation caused by the buoyancy lift of the steel water delivery pipe during grouting can be solved.
Description
Technical Field
The utility model relates to conduit installation construction technical field, concretely relates to install steel conduit's structure in concrete pipe fast.
Background
In the process of municipal pipeline construction, a steel water delivery pipeline needs to be arranged in a concrete casing in a penetrating manner to form a complete water delivery line, and the water delivery pipeline is usually pulled by utilizing a pulling device to penetrate into the concrete casing. For example, in the document of "construction technology for passing pipes through and passing through inside of large-diameter pipeline jacking pipes" (volume 42, 7 th in 2020 of building construction, author land and small bell and the like), an attached traction integrated construction technology for passing pipes through and passing through inside of large-diameter pipeline jacking pipes is introduced, and although the attached traction integrated construction technology has the characteristics of quick construction, low cost and the like, the attached traction integrated construction technology has the following defects: (1) Positioning shafts are only arranged on two horizontal sides, so that the floating of an inner pipeline of the top pipe in the grouting process cannot be prevented; (2) The grouting pipe does not have a proper fixed installation mode and position; (3) A rolling shaft is arranged below the pipeline, and the pipeline and the shaft generate friction in the pipe penetrating process, so that the steel pipe is easily damaged.
The Chinese invention patent (publication number: CN 109323049B) discloses a sleeve type water pipe applied to crossing a bridge and an installation and construction method thereof in 2020, wherein the construction method comprises the following steps: step 1, excavating a ditch of a water delivery pipeline; step 2: installing a concrete sleeve; and 3, step 3: backfilling the ditch groove of the water delivery pipeline; and 4, step 4: installing a pressure steel pipe; and 5: and (5) filling concrete. According to the method, the supporting device is connected between the concrete sleeve and the pressure steel pipe, the steel roller is fixedly arranged at the bottom of the pressure steel pipe, the stability of the pressure steel pipe can be guaranteed, the arrangement of the roller is similar to that in the above documents, larger friction resistance still exists, the steel supporting rods arranged at two sides further increase the advancing resistance, and the penetration of the water conveying pipe is not facilitated.
Disclosure of Invention
The utility model aims at providing a structure of installing steel raceway in the concrete pipe fast to the problem that prior art exists.
In order to achieve the above object, the utility model adopts the following technical scheme:
a structure for quickly installing a steel water delivery pipeline in a concrete pipeline comprises a concrete sleeve and the steel water delivery pipeline penetrating through the concrete sleeve, wherein a plurality of supporting rolling parts are arranged on the periphery of the steel water delivery pipeline, and rolling parts of the supporting rolling parts are respectively abutted to the inner periphery of the concrete sleeve; the inner periphery of the concrete sleeve is provided with a floating support assembly, the floating support assembly and the support rolling piece are respectively arranged at the upper side and the lower side of the axis, and a gap is formed between the floating support assembly and the outer periphery of the steel water delivery pipe; and a grouting pipeline is also arranged in the floating support assembly, and slurry is filled between the steel water delivery pipe and the concrete sleeve.
Through the arrangement of the installation structure, the installation and construction efficiency of the steel water pipe in the concrete sleeve can be improved, meanwhile, the damage to the steel water pipe in the pipe penetrating construction process is reduced, and the problem of overlarge coaxiality deviation caused by the floating of the steel water pipe in grouting can be solved.
The steel water delivery pipe can be well and stably supported in a rolling mode through the arrangement of the supporting rolling pieces, and can stably move along the concrete sleeve in a penetrating mode; the floating support component can be used for fixing a support of a grouting pipeline, so that the grouting pipeline is convenient to arrange and install, and can play a role in controlling limiting on the other hand, so that excessive floating of the steel water pipe in the grouting process is prevented, the steel water pipe can be limited within an acceptable error range, and the accuracy and effectiveness of installation of the steel water pipe are improved.
The gap is arranged, so that a safe interval can be kept between the floating support assembly and the steel water pipe, the floating support assembly and the steel water pipe cannot be in direct contact in the process of passing through and moving, the friction resistance caused by contact is avoided, and the steel water pipe is prevented from being damaged by contact; the size of the gap is set according to the error range of pipeline installation, and even if the gap exists, the steel water pipe can be prevented from floating upwards beyond the range in the subsequent grouting process.
Furthermore, the support rolling part comprises a universal ball seat and a universal ball embedded in the universal ball seat, the universal ball is abutted to the inner periphery of the concrete sleeve, and the universal ball seat is arranged on the outer periphery of the steel water delivery pipe.
Through the arrangement of the universal ball seat and the universal ball, the steel water pipe can be supported in a rolling mode and can be moved in the circumferential direction or other directions, and when the pipe is penetrated, the movement can be used for adjusting the position of the steel water pipe, and the effect of multi-direction fine adjustment is achieved.
Furthermore, the periphery of the steel water conveying pipe is provided with a thin steel plate, and the thin steel plate is connected with the universal ball seat in a welding mode, so that the universal ball seat is convenient to connect.
Furthermore, the support rolling parts are provided with three groups, one group is arranged right below the steel water delivery pipe, and the two groups are symmetrically arranged on two sides of the steel water delivery pipe. The support effect can be better provided by the arrangement of a plurality of groups, and the side limit and support effects can be achieved by one group arranged on the opposite sides of the two sides, so that the arrangement of positioning shafts on the two horizontal sides of the steel water pipe is avoided.
Furthermore, the floating support assembly comprises a pair of arc-shaped flat steels, the arc-shaped flat steels are connected through a plurality of radially arranged round steels, steel bars or angle steels, the arc-shaped flat steel above is screwed on the inner periphery of the concrete sleeve, and the arc-shaped flat steel below and the outer periphery of the steel water delivery pipe keep the gap.
The floating support assembly is simple in structure and easy to manufacture and install, the adopted materials are steel materials which are easy to obtain in a construction site, the cost is low, and waste steel materials can be fully utilized; the arc-shaped flat steel is favorable for being arranged along the arc-shaped inner periphery to form an arc-shaped supporting surface, the limitation of the upper part and the two sides is considered, and the supporting effect is better.
Furthermore, an elastic pad is arranged below the floating support assembly, the elastic pad is arranged below the arc-shaped flat steel, and a distance is arranged between the elastic pad and the periphery of the steel water delivery pipe.
The elastic cushion is a rubber cushion or other flexible materials attached to the lower side of the flat steel, the steel water conveying pipe floats and plays a role in protecting the flat steel water conveying pipe when grouting is conducted, and a proper distance is reserved before grouting is conducted, so that the increase of the moving friction force is avoided.
Furthermore, the floating support assemblies are sequentially arranged in the length direction of the inner periphery of the concrete sleeve at intervals, the grouting pipeline comprises a plurality of grouting pipes which are axially arranged, the grouting pipes are respectively connected with the floating support assemblies through a plurality of pipe clamps, each grouting pipe is respectively provided with a plurality of three-way pipes or a plurality of openings, and the three-way pipes or the openings are arranged in the areas between the adjacent floating support assemblies.
The plurality of floating support assemblies are arranged along the length direction, the steel water delivery pipe can be limited in the whole axial direction, and the arrangement of the plurality of grouting pipes can improve grouting efficiency; the three-way pipes or the openings are arranged at intervals, the floating support assemblies are staggered, injected slurry can enter between the concrete sleeve and the steel water conveying pipe, filling is completed quickly, and blocking of the floating support assemblies to the slurry is reduced.
Furthermore, after the steel water delivery pipe completely penetrates into the concrete sleeve, sealing plates are further arranged at the front end and the rear end of the concrete sleeve, exhaust ports are formed in the sealing plates respectively, and at least one end of the grouting pipeline penetrates through the sealing plates and is led out.
The sealing plate can be used for blocking the poured slurry, the arrangement of the exhaust port facilitates grouting and exhausting on the one hand, and on the other hand, the sealing plate can be used as a slurry overflow port to judge whether the slurry is filled.
Further, the concrete sleeve is DN2000 concrete sleeve, namely the inner diameter is 2000mm, and the wall thickness is 200mm; the steel water delivery pipe is DN1600 steel pipe, and the outer diameter is 1620mm.
Compared with the prior art, the beneficial effects of the utility model are that: 1. by the arrangement of the installation structure, the installation and construction efficiency of the steel water pipe in the concrete sleeve can be improved, meanwhile, the damage to the steel water pipe in the pipe penetrating construction process is reduced, and the problem of overlarge coaxiality deviation caused by the floating of the steel water pipe during grouting can be solved; 2. the steel water delivery pipe can be well and stably supported in a rolling mode through the arrangement of the supporting rolling pieces, and can stably move along the concrete sleeve in a penetrating mode; the floating support assembly can be used for a fixing support of a grouting pipeline, so that the grouting pipeline is convenient to arrange and install, and can play a role in controlling and limiting to prevent the steel water pipe from floating upwards in the grouting process; 3. the gap is arranged, so that a safe interval can be kept between the floating support assembly and the steel water pipe, frictional resistance caused by contact is avoided, and the steel water pipe is prevented from being damaged by contact.
Drawings
Fig. 1 is a partial perspective view illustrating a structure for rapidly installing a steel water pipe in a concrete pipe according to the present invention;
fig. 2 is a schematic cross-sectional structure view of a structure for quickly installing a steel water pipe in a concrete pipe according to the present invention;
in the figure: 1. a concrete sleeve; 2. a steel water delivery pipe; 3. a floating support assembly; 301. arc flat steel; 302. round steel; 4. supporting the rolling member; 401. a universal ball seat; 402. a universal ball; 5. a gap; 6. grouting pipes; 7. a pipe clamp; 8. an elastic pad; 9. a thin steel sheet.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the drawings in the present application, and it should be understood that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "middle", "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
As shown in fig. 1 and 2, a structure for quickly installing a steel water pipe in a concrete pipe comprises a concrete casing 1 and a steel water pipe 2 penetrating through the concrete casing 1, wherein a plurality of support rolling members 4 are arranged on the outer periphery of the steel water pipe 2, and rolling parts of the support rolling members 4 are respectively abutted against the inner periphery of the concrete casing 1; the inner periphery of the concrete sleeve 1 is provided with a floating support component 3, the floating support component 3 and the support rolling part 4 are respectively arranged at the upper side and the lower side of the axis, and a gap is arranged between the floating support component 3 and the outer periphery of the steel water delivery pipe 2; and a grouting pipeline is also arranged in the floating support component 3, and slurry is filled between the steel water delivery pipe 2 and the concrete sleeve 1.
Through the arrangement of the installation structure, the installation and construction efficiency of the steel water delivery pipe in the concrete sleeve can be improved, meanwhile, the damage to the steel water delivery pipe in the pipe penetrating construction process is reduced, and the problem of overlarge coaxiality deviation caused by the buoyancy lift of the steel water delivery pipe during grouting can be solved.
The support rolling pieces 4 are arranged to roll and support the steel water delivery pipe 2 well and stably, so that the steel water delivery pipe can stably pass through the concrete sleeve 1 to move; the floating support assembly 3 can be used for fixing a fixing support of a grouting pipeline, so that the grouting pipeline is convenient to arrange and install, the floating support assembly can play a role in controlling limiting, the steel water pipe 2 is prevented from floating upwards in the grouting process, the steel water pipe 2 can be limited within an acceptable error range, and the accuracy and the effectiveness of installation of the steel water pipe 2 are improved.
The gap 5 is arranged, so that a safe interval can be kept between the floating support component 3 and the steel water pipe 2, and the floating support component and the steel water pipe 2 cannot be directly contacted in the process of passing through and moving, so that the friction resistance caused by contact is avoided, and the steel water pipe 2 is also prevented from being damaged by contact; the size of the gap 5 is set according to the error range of pipeline installation, and even if the gap exists, the steel water delivery pipe 2 can be prevented from floating upwards beyond the range in the subsequent grouting process.
Further, the support rolling member 4 comprises a universal ball seat 401 and a universal ball 402 embedded in the universal ball seat 401, the universal ball 402 abuts against the inner periphery of the concrete casing 1, and the universal ball seat 401 is mounted on the outer periphery of the steel water pipe 2. The ball 402 is a metal ball.
Through the arrangement of the universal ball seat 401 and the universal ball 402, the steel water pipe 2 can be supported in a rolling manner and can be moved in the circumferential direction or other directions, and when the pipe is penetrated, the position of the steel water pipe 2 can be adjusted through the movement, so that the multi-direction fine adjustment effect is achieved.
Furthermore, a thin steel plate 9 is arranged on the periphery of the steel water pipe 2, and the thin steel plate 9 is welded with the universal ball seat 401, so that the universal ball seat 401 is convenient to connect, the steel water pipe 2 and the universal ball seat 401 cannot slide relatively, and rolling friction between the steel water pipe 2 and the universal ball seat 401 is avoided.
Furthermore, three groups of supporting rolling parts 4 are arranged on the same circumferential surface, one group is arranged right below the steel water conveying pipe 2, and one group is arranged at 45-degree positions on two sides of the steel water conveying pipe symmetrically. The support effect can be better provided by the arrangement of a plurality of groups, and the side limit and support effects can be realized by the group arranged on the opposite sides of the two sides, so that the arrangement of positioning shafts on the two horizontal sides of the steel water delivery pipe is avoided.
Further, the floating support assembly 3 comprises a pair of arc-shaped flat steels 301, the arc-shaped flat steels 301 are connected through a plurality of radially arranged round steels 302, the arc-shaped flat steel 301 above is screwed on the inner periphery of the concrete casing 1, and the gap 5 is kept between the arc-shaped flat steel 301 below and the outer periphery of the steel water pipe 2.
The floating support assembly 3 is simple in structure and easy to manufacture and install, the adopted materials are steel materials which are easy to obtain in a construction site, the cost is low, and waste steel materials can be fully utilized; the arc-shaped flat steel is favorable for being arranged along the arc-shaped inner periphery to form an arc-shaped supporting surface, the limitation of the upper part and the two sides is considered, and the supporting effect is better.
Furthermore, an elastic pad 8 is further arranged below the floating support component 3, the elastic pad 8 is arranged below the arc-shaped flat steel 301, and a distance is arranged between the elastic pad 8 and the periphery of the steel water delivery pipe 2.
The elastic cushion 8 is a rubber cushion or other flexible materials attached to the lower side of the flat steel, the steel water conveying pipe 2 floats up to play a role in protecting the flat steel during grouting, and a proper distance is reserved before grouting, so that the increase of the moving friction force is avoided.
Furthermore, the floating support assemblies 3 are sequentially arranged in the length direction of the inner periphery of the concrete sleeve 1 at intervals, the grouting pipeline comprises a plurality of grouting pipes 6 which are axially arranged, the grouting pipes 6 are respectively connected with the floating support assemblies 3 through a plurality of pipe clamps 7, each grouting pipe 6 is respectively provided with a plurality of three-way pipes, and the three-way pipes are all arranged in the area between the adjacent floating support assemblies 3.
The plurality of floating support assemblies 3 are arranged along the length direction, the steel water delivery pipe 2 can be limited in the whole axial direction, and the arrangement of the plurality of grouting pipes 6 can improve grouting efficiency; the three-way pipes are arranged at intervals and staggered with the floating support assemblies 3, so that injected slurry can enter between the concrete sleeve 1 and the steel water conveying pipe 2, the filling is completed quickly, and the blocking of the floating support assemblies to the slurry is reduced.
Further, after the steel water delivery pipe 2 completely penetrates into the concrete sleeve 1, sealing plates are further arranged at the front end and the rear end of the concrete sleeve 1, exhaust ports are formed in the sealing plates respectively, and at least one end of the grouting pipeline penetrates through the sealing plates and is led out.
The sealing plate can be used for blocking the poured slurry, the arrangement of the exhaust port facilitates grouting and exhausting on the one hand, and on the other hand, the sealing plate can be used as a slurry overflow port to judge whether the slurry is filled.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A structure for quickly installing a steel water delivery pipeline in a concrete pipeline comprises a concrete sleeve and the steel water delivery pipeline penetrating through the concrete sleeve, and is characterized in that a plurality of supporting rolling parts are arranged on the periphery of the steel water delivery pipeline, and rolling parts of the supporting rolling parts are respectively abutted against the inner periphery of the concrete sleeve; the inner periphery of the concrete sleeve is provided with a floating support assembly, the floating support assembly and the support rolling piece are respectively arranged at the upper side and the lower side of the axis, and a gap is formed between the floating support assembly and the outer periphery of the steel water delivery pipe; and a grouting pipeline is also arranged in the floating support assembly, and slurry is filled between the steel water delivery pipe and the concrete sleeve.
2. The structure for quickly installing the steel water conveying pipeline in the concrete pipeline according to claim 1, wherein the supporting rolling members comprise universal ball seats and universal balls embedded in the universal ball seats, the universal balls are abutted against the inner periphery of the concrete sleeve, and the universal ball seats are installed on the outer periphery of the steel water conveying pipeline.
3. The structure for quickly installing the steel water conveying pipeline in the concrete pipeline according to claim 2, wherein a thin steel plate is arranged on the periphery of the steel water conveying pipeline and is welded and connected with the universal ball seat.
4. The structure for quickly installing the steel water conveying pipe in the concrete pipeline according to claim 1, wherein three groups of supporting rolling parts are arranged, one group is arranged right below the steel water conveying pipe, and two groups are symmetrically arranged on two sides of the steel water conveying pipe.
5. The structure for quickly installing the steel water pipe in the concrete pipeline according to claim 1, wherein the floating support assembly comprises a pair of arc-shaped flat steels, the arc-shaped flat steels are connected through a plurality of radially arranged round steels, reinforcing steel bars or angle steels, the upper arc-shaped flat steel is screwed on the inner periphery of the concrete sleeve, and the lower arc-shaped flat steel keeps the gap with the outer periphery of the steel water pipe.
6. The structure for quickly installing the steel water pipe in the concrete pipeline according to claim 5, wherein an elastic cushion is further arranged below the floating support assembly, the elastic cushion is arranged below the arc-shaped flat steel below the floating support assembly, and a gap is formed between the elastic cushion and the periphery of the steel water pipe.
7. The structure for quickly installing the steel water conveying pipeline in the concrete pipeline according to claim 1, wherein the floating support assemblies are sequentially arranged in the length direction of the inner periphery of the concrete sleeve at intervals, the grouting pipeline comprises a plurality of grouting pipes which are axially arranged, the grouting pipes are respectively connected with the floating support assemblies through a plurality of pipe clamps, each grouting pipe is respectively provided with a plurality of three-way pipes or a plurality of openings, and the three-way pipes or the openings are arranged in the areas between the adjacent floating support assemblies.
8. The structure for quickly installing the steel water conveying pipeline in the concrete pipeline according to claim 1, wherein after the steel water conveying pipeline is completely penetrated into the concrete sleeve, sealing plates are further arranged at the front end and the rear end of the concrete sleeve, exhaust ports are respectively formed in the sealing plates, and at least one end of the grouting pipeline penetrates through the sealing plates and is led out.
9. The structure for rapidly installing the steel water pipeline in the concrete pipeline according to claim 1, wherein the concrete sleeve is DN2000 concrete sleeve, namely the inner diameter is 2000mm, and the wall thickness is 200mm; the steel water delivery pipe is DN1600 steel pipe, and the outer diameter is 1620mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221321735.0U CN218000641U (en) | 2022-05-30 | 2022-05-30 | Structure for quickly installing steel water delivery pipeline in concrete pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221321735.0U CN218000641U (en) | 2022-05-30 | 2022-05-30 | Structure for quickly installing steel water delivery pipeline in concrete pipeline |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218000641U true CN218000641U (en) | 2022-12-09 |
Family
ID=84292869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221321735.0U Active CN218000641U (en) | 2022-05-30 | 2022-05-30 | Structure for quickly installing steel water delivery pipeline in concrete pipeline |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218000641U (en) |
-
2022
- 2022-05-30 CN CN202221321735.0U patent/CN218000641U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN210564534U (en) | Rectangular pipe jacking oblique crossing construction structure | |
| CN218000641U (en) | Structure for quickly installing steel water delivery pipeline in concrete pipeline | |
| CN106151679A (en) | Large diameter reinforced concrete pipe road towed boil on the nape opposite the mouth method | |
| CN207620126U (en) | Beam slab leaks drainage device | |
| CN110685234B (en) | Construction method of corrugated steel pipe culvert | |
| CN210151696U (en) | Tower packer for packing conduit frame cement paste | |
| CN115218034B (en) | Method for installing elastic shooting through pipe in concrete sleeve | |
| CN110701383A (en) | Damping device is used in construction of sand ground push pipe | |
| CN217537063U (en) | Jacking device for prefabricated final joint of immersed tube tunnel | |
| CN216765843U (en) | Prevention of seepage water concrete precast tubular pile | |
| CN213805220U (en) | Ecological bank protection reinforcing apparatus of hydraulic engineering | |
| CN209925759U (en) | Double-barrelled structure of laying in river course | |
| CN210636422U (en) | Underground continuous wall joint structure | |
| CN216843384U (en) | Major diameter piping erection handling device | |
| CN108468860B (en) | Detachable multi-angle steel jacking pipe deviation correcting device | |
| CN214648928U (en) | Rolling device for dock gate | |
| CN205475123U (en) | Rotatory steel dam of hydraulic pressure | |
| CN112283446A (en) | Reinforced concrete jacking pipe and processing technology thereof | |
| CN217758817U (en) | Underwater grouting leakage-proof structure for jacket foundation | |
| CN213929746U (en) | Drainage system pipeline arrangement structure | |
| CN219490991U (en) | Guiding device capable of accurately positioning steel sleeve box to be placed down | |
| CN220847619U (en) | Pile anchor supporting improved structure | |
| CN220150358U (en) | Fixing device for well point downcomer of deep foundation pit | |
| JP2575940B2 (en) | Conduit construction method | |
| JP5408543B2 (en) | Pipeline rehabilitation method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |