CN214247327U - Split starting multifunctional operation trolley of slurry shield machine - Google Patents
Split starting multifunctional operation trolley of slurry shield machine Download PDFInfo
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- CN214247327U CN214247327U CN202023074027.5U CN202023074027U CN214247327U CN 214247327 U CN214247327 U CN 214247327U CN 202023074027 U CN202023074027 U CN 202023074027U CN 214247327 U CN214247327 U CN 214247327U
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Abstract
The utility model discloses a slurry shield constructs quick-witted components of a whole that can function independently multi-functional operation platform truck of starting aims at solving among the prior art pipeline and extends construction hard consuming time, with high costs and the big technical problem of safe risk. The operation trolley mainly comprises a synchronous grouting mechanism, a pipeline replacing mechanism, an operation platform, a main machine room and the like; the rapid extension construction method comprises the steps of shield tunneling, segment installation, slurry pipeline extension, circulating propulsion and the like. The utility model discloses multi-functional operation platform truck collects multiple functions (mud pipeline is changed, synchronous slip casting, grease injection, secondary slip casting, shield constructs the quick-witted operation of machine) in an organic whole, can realize that the shield constructs to accomplish fast that the components of a whole that can function independently starts, and the purpose that the complete machine tunnelled is realized once going into the well to the supporting trailer in back. The multifunctional operation trolley is used for connecting and extending the slurry pipeline, is easy to operate and implement, can form flow cycle operation, accelerates the tunneling rate, reduces the construction period risk caused by overlong slurry pipeline extension time, saves manual investment and reduces the cost.
Description
Technical Field
The utility model relates to a shield tunnelling equipment technical field, concretely relates to slurry shield constructs quick-witted components of a whole that can function independently multi-functional operation platform truck of starting.
Background
In recent years, with the development of economy and society, the capital construction industry of China is rapidly developed, and the supporting capability of the development of the economy and the society is greatly improved. The construction technology in the capital construction technology is more and more diversified and mature, wherein the shield construction technology is also faster in progress and wider in application range, and the shield machine consists of a machine head and a plurality of sections of follow-up equipment trolleys and generally adopts two starting modes of integral starting and split starting.
The existing common solution for extending the shield split starting pipeline is as follows: the length of a section of slurry pipe is tunneled, and various pipelines are connected together by manually matching with a small machine tool; the method is common in use, but the construction procedures are more, the occupied construction time is longer, the corresponding construction period is longer, a large amount of manpower is input, the cost is higher, and the safety risk is high.
The shield split starting technology is limited by a starting working well, does not have an integral starting condition, but realizes the complete machine tunneling for quickly finishing split starting, effectively reduces the problem of slow construction progress generated by the split starting of the shield, and is particularly key for quickly and safely starting a large-diameter shield machine in a split manner in a limited starting space and improving the construction progress.
Disclosure of Invention
The to-be-solved purpose of the utility model is to provide a slurry shield constructs quick-witted components of a whole that can function independently multi-functional operation platform truck of starting aims at solving the technical problem of shield components of a whole that can function independently starting operation function dispersion, unable integrated operation, control in the tunnelling engineering.
In order to solve the technical problem, the utility model adopts the following technical scheme:
design a slurry shield constructs quick-witted components of a whole that can function independently multi-functional operation platform truck of starting, including setting up on the platform truck frame:
the synchronous grouting mechanism is used for storing and injecting mortar required by shield tunneling and comprises a mortar tank, a grouting pump and a connecting pipeline for communicating the mortar tank with a synchronous grouting pipeline of the shield tunneling machine;
the pipeline replacing mechanism is used for realizing replacement and extension of a slurry pipeline and comprises a rotary suspension arm and a slurry extension pipeline, wherein the slurry extension pipeline comprises a slurry hard pipe, a transition hose, a hose clamping box and a hose change gear platform; the mud hard pipe is in bridge connection with the corresponding shield machine inlet and outlet mud pipe and the transition hose; one end of the transition hose is used for butting the slurry hard pipe, and the other end of the transition hose is used for butting a corresponding in-hole extending slurry pipe; the hose change gear platform is fixedly arranged on one side of the trolley frame through a corresponding support frame and is used for supporting the hose clamping box; the transition hose realizes the extension and the reset of the slurry extension pipeline through the guiding, the backward movement and the forward movement of the hose clamping box;
the working platform is used for arranging expansion equipment or/and carrying out corresponding business operation and is arranged at the front end part or/and the rear end part of the trolley frame;
and the main machine room is used for controlling the shield machine, is arranged between the synchronous grouting mechanism and the pipeline replacement mechanism, and is used for controlling the operation of the shield machine and controlling the implementation of synchronous grouting, secondary grouting, grease injection or/and grouting pipeline replacement.
The multifunctional operation trolley for the split starting of the slurry shield machine further comprises a grease injection mechanism for injecting tail grease, lubricating grease or/and sealing grease of the shield machine, and the multifunctional operation trolley comprises a grease pump and a corresponding connecting pipeline, wherein the grease pump is arranged on the operation platform.
The multifunctional operation trolley for the split starting of the slurry shield machine further comprises a secondary grouting mechanism, and the secondary grouting mechanism is composed of a slurry stirring container, a secondary grouting pump and corresponding connecting pipelines.
The rotary suspension arms are arranged at the front end or/and the rear end of the trolley frame through corresponding support frames so as to implement hoisting operation during slurry pipeline replacement.
The pipeline replacing mechanism further comprises a roller group arranged below the transition hose and the hose clamping box to form a hose sliding channel, and the hose sliding channel plays a role in guiding the hose and reducing the friction force of the movement of the hose.
The trolley frame is provided with corresponding support frames, and the mortar tank and the main control room are arranged at corresponding positions of the support frames in a welding, clamping groove or/and bolt connection mode.
The lower part of the bottom of the trolley frame is provided with a track or trackless walking wheel which is pulled by a corresponding pulling device to realize walking.
Compared with the prior art, the utility model discloses a main beneficial technological effect lies in:
1. the utility model discloses multifunctional operation platform truck has organically integrated mud pipeline change mechanism, synchronous thick liquid injection mechanism, secondary slip casting mechanism, grease injection mechanism and shield structure machine operation control system, and multiple functions (mud pipeline is changed, the synchronous slip casting of shield structure, multiple grease injection, secondary slip casting, shield structure machine operation) in an organic whole, can realize that the shield constructs to accomplish fast that the components of a whole that can function independently starts, and the purpose that the complete machine tunnelled is realized once going into the well to the supporting trailer in back.
2. The utility model discloses each mechanism of function operation platform truck disposes rationally, and space is saved, uses and maintains conveniently, and constructor drops into fewly, can effectively improve the site operation progress, safe and reliable, labour saving and time saving, very big improvement the efficiency of work, can realize the tunnelling of whole machine as early as possible, improve the efficiency of construction, and cost-effectiveness is obvious.
3. With the utility model discloses the linking and the extension of mud pipeline are implemented to multi-functional operation platform truck, and easily the operation is implemented, can form the line circulation operation for tunnelling speed has reduced the time limit for a project risk that mud pipeline extension time overlength leads to, practices thrift artifical input, reduce cost.
4. The utility model discloses the device can realize the mechanized change of mud pipe to a certain extent, and intensity of labour reduces, can improve the mud pipeline and extend the efficiency of construction, reduces safe risk, practices thrift the time limit for a project, has higher economic benefits and social.
Drawings
FIG. 1 is one of the side views of the multifunctional operation trolley for split starting of the slurry shield machine of the present invention;
fig. 2 is a view a-a of fig. 1.
Fig. 3 is a second side view of the multifunctional operation trolley for separate starting of the slurry shield machine of the present invention;
fig. 4 is a view B-B of fig. 3.
Fig. 5 is a schematic view of the plane structure layout of the multifunctional operation trolley for the split starting of the slurry shield machine of the present invention.
Fig. 6 is a schematic view of the connection structure of the slurry extension pipeline of the present invention.
In the above figures, 1 is a mortar tank, 2 is a master control room, 3 is a front rotary boom, 4 is a hose change gear platform, 5 is a support frame, 6 is a right side platform, 7 is a main frame dragging seat, 8 is a front end platform, 9 is a slurry hard pipe, 10 is a roller set, 11 is a hose clamping box, 12 is a dragging wheel, 13 is a transition hose, 14 is an in-hole slurry inlet and outlet pipe, 15 is a shield machine slurry inlet and outlet pipe, 16 is a rear rotary boom, and 17 is a rear end platform.
Detailed Description
The following embodiments are only intended to illustrate the present invention in detail, and do not limit the scope of the present invention in any way.
The apparatuses, devices, or structural parts referred to in the following examples are all conventional commercially available products unless otherwise specified.
The first embodiment is as follows: the multifunctional operation trolley for the split starting of the slurry shield machine, as shown in fig. 1 to 6, comprises a trolley frame (the lower part of the bottom of the trolley frame is provided with a rail or trackless walking wheel which is pulled by a corresponding pulling device to realize walking) and is arranged on the trolley frame:
the synchronous grouting mechanism comprises a mortar tank, a grouting pump and a connecting pipeline for communicating the grouting pump and a synchronous grouting pipeline of the shield tunneling machine, and is used for storing and injecting mortar required by shield tunneling;
the pipeline replacing mechanism is used for replacing and extending a slurry pipeline and comprises a rotary suspension arm and a slurry extending pipeline, wherein the slurry extending pipeline comprises a slurry hard pipe 9, a transition hose 13, a hose clamping box 11 and a hose change gear platform 4;
the rotary suspension arm comprises a front rotary suspension arm 3 and a rear rotary suspension arm 16 which are arranged on the trolley frame through corresponding support frames so as to realize the lifting operation of materials such as a slurry pipe, a grouting material and the like in the tunnel;
the mud hard pipe 9 is fixedly arranged on a main beam at the upper part of the support frame 5, and plays a role of connecting the corresponding shield machine in-out mud pipe 15 and the transition hose 13;
the transition hose 13 is guided and moves back and forth through the hose clamping box 11 to realize extension and recovery of a slurry pipeline (when the trolley walks forwards, the longitudinal extension and release of the transition hose 13 are realized by means of backward movement and sliding of the hose clamping box 11, further the extension of a slurry conveying transition distance is completed, after the limit length of the hose is reached, the recovery and winding of the hose are realized through resetting of the hose clamping box to complete the shortening of the slurry conveying transition distance), one end of the transition hose is used for butting the slurry hard pipe 9, and the other end of the transition hose is used for butting the slurry inlet and outlet pipe in a corresponding hole;
the hose change gear platform 4 is fixedly arranged on one side of the support frame 5 and is used for supporting a hose clamping box 11 and a dragging wheel 12 for supporting the hose box to drive;
a roller set 10 consisting of a plurality of rollers is correspondingly arranged below the transition hose 13 and the hose clamping box 11 to form a hose sliding channel, so that the hose can be guided and the friction force of the transition hose 13 can be reduced;
a corresponding dragging wheel 12 is arranged below the hose clamping box 11 so as to realize the rail walking of the hose clamping box 11;
the operation platform comprises a front platform 8 and a rear platform 17 which are respectively arranged at the front end and the rear end of the trolley frame and are used for arranging expansion equipment and carrying out corresponding business operation;
the grease injection mechanism is used for injecting tail grease, lubricating grease and sealing grease of the shield machine, and comprises a grease pump and a corresponding connecting pipeline, wherein the grease pump is arranged on the operation platform;
and the secondary grouting mechanism comprises a slurry stirring container, a secondary grouting pump and corresponding connecting pipelines and is used for performing duct piece grouting reinforcement on the formed duct piece in the hole to play roles in supplementing synchronous grouting deficiency and duct piece leakage water stop.
And the main machine room is used for controlling the shield machine, is arranged between the synchronous grouting mechanism and the pipeline replacing mechanism, and is used for controlling the operation of the shield machine and controlling and implementing synchronous grouting, secondary grouting, grease injection or/and grouting pipeline replacement.
The mortar tank, the main control room and the rotary suspension arm are arranged at the corresponding positions of the support frame in a welding, clamping groove or/and bolt connection mode.
According to the construction method for quickly extending by using the multifunctional trolley, after shield tunneling and segment installation are completed according to a normal procedure, the rapid replacement is realized by using the multifunctional operation trolley after the slurry pipe reaches the extension length. The method specifically comprises the following steps:
1. construction preparation: the shield host is assembled and debugged in the well; all preparation works before shield launching are finished and the check and acceptance before the starting node is finished, and split launching conditions are provided.
2. Shield tunneling: after various preparation works are finished, a slurry circulation system is started, a propulsion system of the shield machine is started to propel forwards according to formulated tunneling parameters, circulation can be stopped after the propulsion stroke is reached and the continuous slurry circulation is stopped for no less than 10min, so that the subsequent starting difficulty of the slurry circulation system is prevented, the multifunctional operation trolley is connected with a shield host and moves forwards synchronously along with the shield machine, and a slurry pipeline extending device on the multifunctional operation trolley moves backwards slowly along with the tunneling by utilizing a working track.
3. And (3) muddy water management: the mud water is prepared by mixing water, bentonite, clay and other materials in a ground mud water field according to a certain proportion, and adding a dispersion peptizer, an organic mother water gel agent, a weighting agent and other mud adjusting agents if necessary. The proportion, the viscosity, the plastic deformation value, the gel strength, the mud wall formability and the lubricity are adjusted according to the requirements, so that the mud water becomes a plastic fluid, namely the preparation process of the mud water is completed. The slurry inlet system of the shield machine is communicated with a slurry pipeline of the multifunctional operation trolley and enters an excavation bin, the slurry carries out muck through the slurry discharge system and enters slurry water treatment equipment for separation, and the slurry is recycled after certain adjustment.
4. Assembling pipe pieces: the segment selection is based on the premise of meeting the tunnel line type, the segment installation rear shield tail clearance is considered to meet the next tunneling cycle limit value, and sufficient shield tail clearance is ensured to prevent the shield tail from directly contacting the segment. And before the duct piece is installed, selecting the point position of the duct piece to be installed according to the gap between the shield tail and the stroke of the propulsion oil cylinder. And when the shield tunneling reaches a preset length and the stroke of the thrust oil cylinder at the position of the capping block is to be installed, the shield tunneling machine stops tunneling and the segment installation is carried out. When the pipe piece is installed, the bottom of the tunnel is required to be started, then the adjacent blocks are installed in sequence, and finally the capping block is installed. When a duct piece is installed, the duct piece is immediately inserted into and connected with the connecting bolt in the longitudinal and circumferential directions, and the nut is worn and fastened by a pneumatic wrench. After the duct piece is installed in place, the pushing oil cylinder which extends out of the corresponding position in time pushes the duct piece tightly, the pushing force of the pushing oil cylinder is larger than the force required by stabilizing the duct piece, and then the duct piece installing machine can be moved away.
5. Slurry pipeline extension: the shield tunneling is finished to a certain length, namely the transition hose 11 in the multifunctional operation trolley is stopped after extending to the limit, the circulation is stopped, the slurry inlet and discharge pipeline plate valve near the position of the slurry extension pipeline is closed, the pressure of the position of the extension joint is released, slurry is discharged into a slurry collecting box arranged on an operation platform (after the residual slurry in the pipeline is discharged, the slurry is transported to a cave mouth through a horizontal transportation battery truck in the cave and is discharged into a ground slurry storage pool), the extension position interface is removed after the pressure release is finished, the transition hose 13 at the rear end of the multifunctional trolley is reset by a dragging device (the dragging device is fixed on a hose hanging wheel platform, and the hose clamping box 11 is reset by tightening a steel wire rope), the transition hose 13 and the hose clamping box 11 are reset, and the rear part of the transition hose extends, the slurry inlet and outlet slurry pipe in the cave and the slurry inlet and outlet slurry pipe of the shield tunneling machine are moved and walk in the range of the suspension arm through a lifting And (5) butting to complete pipeline extension.
6. Circularly propelling: and after the replacement of the slurry pipeline is finished, opening the plate valve to start the slurry circulation system, and starting the propulsion system to propel forward after the slurry inlet and outlet flow is stable.
The beneficial effects in the aspect of safety quality are as follows:
firstly, a multifunctional operation trolley is adopted, and the safety risk that the pipeline falls off in the conventional pipeline mounting and dismounting process is avoided.
And personnel safety caused by unsafe factors such as pipeline pressure in the process of installing and detaching the pipeline is avoided.
And hoisting damage caused in the pipeline hoisting butt joint process is avoided.
And fourthly, the installation quality of the sealing device between pipelines can be ensured to a certain extent in the pipeline replacing process of the multifunctional trolley.
And fifthly, the multifunctional operation trolley is adopted to orderly arrange the pipelines, so that the operation risk is avoided in an operation area.
The beneficial effect in the aspect of the construction period is as follows:
firstly, the length of the hose is extended by adopting the multifunctional operation trolley, and the pipeline replacement frequency is reduced.
Secondly, the multifunctional operation trolley is provided with a rotary suspension arm, pipeline lifting is guaranteed, and pipeline extension can be completed more quickly.
Third the utility model discloses multi-functional platform truck collects multi-functionally in an organic whole, can break through the construction limitation of single equipment, shortens the pipeline extension time, reduces personnel's operation intensity, reduces time limit for a project pressure, has higher time limit for a project benefit.
Social benefits are as follows:
the slurry shield split starting technology is improved, a large number of construction periods and manpower are saved, the progress of the shield construction technology is further promoted, and certain effects are achieved on the development of economic and social development.
And the phenomena of slurry transverse flow and dirty and messy in the slurry pipeline replacement process are reduced, environmental protection and water conservation ecological management are facilitated, and great social benefits are achieved for site civilized construction.
Application example: the civil engineering construction of the water resource allocation project of the Zhujiang delta B3 standard project overview: the Zhujiang delta water resource allocation project spans across the mountain city, Guanzhou city, Dongguan city and Shenzhen city. Water is taken from a cyprinus carpio continentalis water intake in the Xijiang water system, and extends to the east to a destination Mingming reservoir through a high new sand reservoir, a pine mountain reservoir and a Rotian reservoir. The main water supply targets are the water-deficient regions of southern Sha region, Shenzhen region and Dongguan region in Guangzhou city. The total length of the water transmission line is 113.2 km. The Zhujiang delta water resource allocation project B3 is a part from the water-supply main line high-new sand reservoir to the Shaxi high-level water pool. The starting point is GS04# working well of yellow pavilion town in south sand area of Guangzhou city, the line is arranged from west to east, the line passes through Qingsheng automaid area from south side, the south sand bridge passes through lotus mountain waterway and lion ocean from north side and south sand large bridge south side of lion ocean tunnel of special line for passenger transport in Guangdong province, and the line enters GS08# working well of Shatian town of Dongguan city from north side of Tiger door harbor in Shatian town of Dongguan city.
The construction of the engineering civil engineering construction B3 standard GS07# (DG 22 #) -GS 06# (GZ 21 #) for the water resource allocation of the Zhujiang delta is realized by adopting the multifunctional trolley in the first embodiment and the construction method in the second embodiment to finish the split starting of the slurry shield machine.
The method comprises the following steps of (1) constructing a GS07# (DG 22 #) -GS 06# (GZ 21 #), wherein the mileage range is GS17+ 158.212-GS 13+988.646, the total length of a line is 3169.566M, the lining of prefabricated reinforced concrete segments is adopted, the segment ring width is 1600mm, the segment thickness is 400mm, the outer diameter is 8300mm, the inner diameter is 7500mm, the segment concrete strength grade is C55, the anti-permeability grade is W12, M30 (A4-70 grade) stainless steel bolts are adopted for staggered joint assembly, the interval split starting length is 105M, a slurry balance shield machine with the diameter of 8650mm is adopted for construction, slurry inlet and discharge pipelines with the diameter of 400mm are adopted for a slurry pipe, and the residue soil transportation of the slurry shield machine is realized. The starting working well is of a circular vertical shaft structure, the effective operation distance is 17.5m, and the shield starting adopts a split starting mode.
The conventional split originating slurry pipe is replaced for 3-5 h/time, only 1-2 h is needed for completing one slurry pipe by adopting the multifunctional operation trolley, the construction efficiency can be improved by 1 time, and the construction period saving benefit is obvious.
The present invention has been described in detail with reference to the accompanying drawings and examples; however, those skilled in the art will recognize that various changes may be made in the above embodiments without departing from the spirit of the invention, or equivalent substitutions of related parts, structures, and materials may be made to the above embodiments, thereby forming various embodiments, which are common variations of the invention and will not be described in detail herein.
Claims (7)
1. The utility model provides a muddy water shield constructs quick-witted components of a whole that can function independently multi-functional operation platform truck that starts which characterized in that, including setting up on the platform truck frame:
the synchronous grouting mechanism is used for storing and injecting mortar required by shield tunneling and comprises a mortar tank, a grouting pump and a connecting pipeline for communicating the mortar tank with a synchronous grouting pipeline of the shield tunneling machine;
the pipeline replacing mechanism is used for realizing replacement and extension of a slurry pipeline and comprises a rotary suspension arm and a slurry extension pipeline, wherein the slurry extension pipeline comprises a slurry hard pipe, a transition hose, a hose clamping box and a hose change gear platform; the mud hard pipe is in bridge connection with the corresponding shield machine inlet and outlet mud pipe and the transition hose; one end of the transition hose is used for butting the slurry hard pipe, and the other end of the transition hose is used for butting a corresponding in-hole extending slurry pipe; the hose change gear platform is fixedly arranged on one side of the trolley frame through a corresponding support frame and is used for supporting the hose clamping box; the transition hose realizes the extension and the reset of the slurry extension pipeline through the guiding, the backward movement and the forward movement of the hose clamping box;
the working platform is used for arranging expansion equipment or/and carrying out corresponding business operation and is arranged at the front end part or/and the rear end part of the trolley frame;
and the main machine room is used for controlling the shield machine, is arranged between the synchronous grouting mechanism and the pipeline replacement mechanism, and is used for controlling the operation of the shield machine and controlling the implementation of synchronous grouting, secondary grouting, grease injection or/and grouting pipeline replacement.
2. The multifunctional working trolley for the split starting of the slurry shield machine as claimed in claim 1, wherein the working trolley further comprises a grease injection mechanism for injecting tail grease, lubricating grease or/and sealing grease of the shield machine, and the multifunctional working trolley comprises a grease pump and a corresponding connecting pipeline which are arranged on the working platform.
3. The multifunctional operation trolley for split starting of the slurry shield machine as claimed in claim 1, further comprising a secondary grouting mechanism, which is composed of a slurry stirring container, a secondary grouting pump and corresponding connecting pipelines.
4. The multifunctional operation trolley for the split starting of the slurry shield machine as claimed in claim 1, wherein the rotary boom is mounted at the front end or/and the rear end of the trolley frame via corresponding support frames to perform the hoisting operation during the replacement of the slurry pipeline.
5. The multifunctional operation trolley for split starting of a slurry shield machine as claimed in claim 1, wherein the pipeline replacement mechanism further comprises a roller set installed below the transition hose and the hose clamping box to form a hose sliding channel, so as to guide the hose and reduce the friction force of the hose movement.
6. The multifunctional operation trolley for split starting of the slurry shield machine as claimed in claim 1, wherein the trolley frame is provided with corresponding support frames, and the mortar tank and the main control room are mounted at corresponding positions of the support frames in a welding, clamping groove or/and bolt connection manner.
7. The multifunctional operation trolley for the separate starting of the slurry shield tunneling machine as claimed in claim 1, wherein the lower part of the bottom of the trolley frame is provided with a rail-bound or trackless walking wheel, and the walking is realized by pulling through a corresponding pulling device.
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| CN202023074027.5U CN214247327U (en) | 2020-12-19 | 2020-12-19 | Split starting multifunctional operation trolley of slurry shield machine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112392494A (en) * | 2020-12-19 | 2021-02-23 | 中铁隧道局集团有限公司 | Slurry shield machine split starting multifunctional operation trolley and rapid extension construction method |
| CN118686633A (en) * | 2024-08-28 | 2024-09-24 | 中铁十四局集团有限公司 | A shield tunnel integral box culvert top surface mud pipeline extension device and method |
-
2020
- 2020-12-19 CN CN202023074027.5U patent/CN214247327U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112392494A (en) * | 2020-12-19 | 2021-02-23 | 中铁隧道局集团有限公司 | Slurry shield machine split starting multifunctional operation trolley and rapid extension construction method |
| CN112392494B (en) * | 2020-12-19 | 2024-12-24 | 中铁隧道局集团有限公司 | Split-type starting multifunctional operation trolley for slurry shield machine and rapid extension construction method |
| CN118686633A (en) * | 2024-08-28 | 2024-09-24 | 中铁十四局集团有限公司 | A shield tunnel integral box culvert top surface mud pipeline extension device and method |
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