CN110350464B - Method for laying cable duct on roadbed - Google Patents
Method for laying cable duct on roadbed Download PDFInfo
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- CN110350464B CN110350464B CN201910532554.9A CN201910532554A CN110350464B CN 110350464 B CN110350464 B CN 110350464B CN 201910532554 A CN201910532554 A CN 201910532554A CN 110350464 B CN110350464 B CN 110350464B
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- cable
- roadbed
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G9/00—Installations of electric cables or lines in or on the ground or water
- H02G9/04—Installations of electric cables or lines in or on the ground or water in surface ducts; Ducts or covers therefor
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Abstract
The invention provides a method for laying cable ducts on a roadbed, which comprises the following steps: providing a cable trough; and arranging the cable troughs at the transition working condition road sections of the roadbed in a transition connection mode, wherein the transition connection mode comprises the adoption of a transition joint, or the adoption of a cable well, or the adoption of a sinking trough for transition laying. The method can enable the cable trough to be separated from the foundation bed for arrangement, thereby effectively avoiding the problems of cable trough water accumulation, foundation bed soaking, roadbed drainage unsmooth and the like. And moreover, the cable trough can adapt to a road section with special working conditions for laying, the integrity of the cable trough and the stability of a roadbed are effectively guaranteed, and the service environment of the cable is improved, so that the service life of the cable and the railway operation safety are guaranteed.
Description
Technical Field
The invention relates to the technical field of cable troughs on a railway roadbed, in particular to a method for arranging cable troughs on a roadbed.
Background
In recent years, the railway technology in China is rapidly developed, particularly for high-speed railways. In the operation process of the high-speed railway, in order to facilitate maintenance and repair of the high-speed railway and ensure operation safety, various cables are usually laid in a cable trough mode. The cable trough is an important infrastructure, and the cable trough is used for maintaining normal power supply and communication of a line and is an artery of a high-speed railway.
At present, the cable grooves of the high-speed railway subgrade in China are usually in the form of communication signal common grooves and power sub-grooves, and the cable grooves and the cover plates are prefabricated by reinforced concrete materials. The existing cable trough is usually arranged on the surface layer of the roadbed bed and is fixed by a shoulder protector to form a whole with the roadbed bed.
However, the existing cable troughs still have some problems during service. For example, rainwater infiltrates into the foundation bed through a gap between the cable trough and the surface layer of the inner side foundation bed, so that water is accumulated in the cable trough, the foundation bed is soaked, and even the roadbed side slope is unstable. Meanwhile, the existence of the cable groove can influence the drainage of the roadbed to form a water blocking effect, which leads to the increase of the water content in the roadbed, thereby causing the problems of frost heaving and the like of the roadbed. In addition, because the roadbed cable trough is usually arranged on the surface layer of the roadbed bed, the number of crossed projects is large, and the shoulder part of the filled roadbed bed needs to be cut in the construction process, so that adjacent uncut graded broken stones are easy to loosen, and the quality of the roadbed bed is influenced. In some special working condition road sections, the laying construction of the cable trough is difficult, and the laying structure of the cable trough is unstable. In addition, the drainage holes of the cable ducts often have the problems of poor construction quality and the like, so that the roadbed and the foundation bed are not drained smoothly, the foundation bed is soaked, the defects of roadbed grout turning, roadbed frost heaving and the like are caused, and the quality of the roadbed and the foundation bed is seriously influenced.
Disclosure of Invention
In view of at least some of the technical problems described above, the present invention aims to propose a method for laying cable troughs on a foundation. The method can enable the cable trough to be separated from the roadbed and laid, thereby effectively avoiding the problems of cable trough water accumulation, basement bed soaking, roadbed drainage unsmooth and the like. In addition, the method can ensure the construction quality and the stability of the roadbed, and improves the service environment of the cable, thereby ensuring the service life of the cable and the railway operation safety.
To this end, according to the present invention, there is provided a method of laying cable troughs on a roadbed, comprising the steps of: providing a cable trough; and arranging the cable troughs at the transition working condition road sections of the roadbed in a transition connection mode, wherein the transition connection mode comprises the adoption of a transition joint, or the adoption of a cable well, or the adoption of a sinking trough for transition laying.
In a preferred embodiment, the cable trough is transitionally paved on the upper and lower roadbed sections by adopting three-way or four-way joints.
In a preferred embodiment, the cable trough is transitionally paved at the cable passing rail by adopting a cable well, and is transitionally paved at a bridge or a tunnel section by adopting the cable well arranged at a bridge head or a tunnel entrance.
In a preferred embodiment, the cable trough is transitionally laid on the embankment inspection stepping road section by using a cable well or a sinking trough.
In a preferred embodiment, the adjacent cable troughs are connected through a fixing cushion plate and fixed on the upper surface of the road shoulder by using anchor bolts.
In a preferred embodiment, the cable grooves are distributed on the slope surface of the road shoulder through support frames, and the support frames are arranged at the joints of the adjacent cable grooves.
In a preferred embodiment, the supporting frame comprises a fixing plate and a supporting plate which are connected at an acute angle, and a connecting plate for connecting the supporting plate and the fixing plate, the fixing plate is used for being fixedly connected with a slope surface of a road shoulder, and the supporting plate is parallel to a horizontal plane and is used for installing the cable trough.
In a preferred embodiment, the cable groove is distributed on the slope surface of the road shoulder by using the buttress.
In a preferred embodiment, the cable trough is arranged at the toe outside the shoulder by using a buttress, and is arranged at the inner side or the outer side of the drainage ditch according to the actual position of the drainage ditch.
In a preferred embodiment, the buttress is a prefabricated sleeve, and a bracket is fixed at the end of the buttress, and the joint of the adjacent cable troughs is installed on the bracket.
Drawings
The invention will now be described with reference to the accompanying drawings.
Fig. 1 is a schematic view of a first embodiment of laying a cable trough on a roadbed according to the invention.
Fig. 2 is a schematic view of a second embodiment of laying a cable trough on a roadbed according to the invention.
Fig. 3 is a schematic view of a third embodiment of laying a cable trough on a roadbed according to the invention.
Fig. 4 is a schematic view of a fourth embodiment of laying a cable trough on a roadbed according to the invention.
Fig. 5 shows the arrangement of the cable troughs at the cable run-through.
Fig. 6 and 7 show the layout structure of the cable troughs on the upper and lower base sections.
Fig. 8 shows a layout structure of cable troughs at the junction of a roadbed and a bridge.
Fig. 9 shows the arrangement of the cable trough at the junction of the roadbed and the tunnel.
Figure 10 shows the routing configuration of the cable trough in one embodiment at the embankment section inspection step.
Figure 11 shows the layout of the cable trough in another embodiment at the embankment section inspection step.
In the present application, the drawings are all schematic and are used only for illustrating the principles of the invention and are not drawn to scale.
Detailed Description
The invention is described below with reference to the accompanying drawings.
In this application, it should be noted that the extending direction of the cable trough along the road-based line is defined as a longitudinal direction, and the direction away from the roadbed line is defined as a transverse direction.
According to the invention, the cable trough is arranged by separating from the foundation bed structure, so that the problems of cable trough water accumulation, foundation bed soaking, roadbed drainage unsmooth and the like are thoroughly avoided, and the adverse effects of the cable trough on roadbed drainage and stability are obviously reduced.
Fig. 1 schematically shows the structure of an embodiment of laying a cable trough on a foundation according to the method of the invention.
According to the invention, before the cable trough laying construction, foundation treatment is firstly carried out. And filling the roadbed foundation to the top of the bottom layer of the roadbed, observing settlement after unloading the pre-compacted soil until the roadbed meets the laying construction requirement of the cable grooves, providing the cable grooves after the roadbed meets the construction conditions, and carrying out laying construction on the cable grooves. The method for laying the cable trough will be described in detail below according to various embodiments.
The first embodiment is as follows:
in the present exemplary embodiment, cable troughs 110 are arranged on the road shoulder 100 in the direction of the line run.
According to the invention, adjacent sub-cable troughs are connected by pipe joints, and are fixedly connected with the road shoulder 100 at the pipe joint by fixing backing plates 120. The fixing pad 120 is fixedly installed on the shoulder 100 by an anchor bolt. The fixed backing plate 120 is provided with a first clamping groove, and the cable duct joint is clamped into the first clamping groove for fixed installation.
In the cable trough laying construction process, firstly, the fixed base plate 120 is installed at a set position, the fixed base plate 120 is fixed with the road shoulder 100 of the foundation bed in an anchoring manner, and then, the cable trough 110 is fixedly installed in the first clamping groove of the fixed base plate 120. In order to improve the stability of laying the cable duct 110, a waterproof structural adhesive is arranged between the first clamping groove of the fixing base plate 120 and the cable duct pipe joint, and the waterproof structural adhesive can effectively reinforce the cable duct 110. The arrangement form of the cable trough 110 can avoid intersecting with the foundation bed structure, so that the drainage smoothness of the foundation bed structure is effectively ensured, the arrangement form is simple in construction, and the influence on the foundation bed filler is avoided. In addition, the fixing base plate 120 can effectively fix the cable trough 110, and can ensure that rainwater on the surface of the roadbed smoothly passes through the lower part of the cable trough 110, so that the problems of cable trough water accumulation, soaking of a foundation bed, poor roadbed drainage and the like are effectively avoided, and the influence of water on the surface of the roadbed on the roadbed is obviously reduced.
Example two:
in the present embodiment, the cable groove 210 is routed in the line extending direction outside the shoulder 200.
According to the present invention, the cable groove 210 is disposed on the slope surface of the shoulder 200 by the support bracket 220. As shown in fig. 2, the support bracket 220 is fixed to the slope surface of the shoulder 200. The supporting bracket 220 includes a fixing plate 221 and a supporting plate 222 connected at an acute angle, and a connecting plate 223 for connecting the fixing plate 221 and the supporting plate 222 is disposed between the fixing plate 221 and the supporting plate 222. From this, support frame 220 forms stable triangular supports structure, can effectively guarantee the stability of support frame 220 to the support of cable duct. An acute angle between the fixing plate 221 and the support plate 222 is set according to an inclination angle of a slope surface of the shoulder, and is set to be equal to the inclination angle of the slope surface so that the support plate 222 is parallel to a horizontal plane. The fixing plate 221 is used to be fixedly connected with the slope surface of the road shoulder 200. In one embodiment, a mounting hole is formed in the fixing plate 221, and an anchor fixing member is installed in the mounting hole, so that the support frame 220 is fixed to the slope surface of the shoulder 200 by anchoring. The laying method of the cable groove 210 is convenient to construct, has no requirement on shoulder construction, has good fixing strength, and can effectively ensure the stability of the cable groove. In addition, the method can enable the cable trough 210 to be separated from the foundation bed for arrangement, so that the problems of cable trough water accumulation, foundation bed soaking, roadbed drainage unsmooth and the like can be effectively avoided, the service environment of the cable is obviously improved, and the service life of the cable and the railway operation safety are guaranteed.
In this embodiment, the supporting plate 222 is provided with a second engaging groove. Adjacent sub-cable grooves are connected by pipe joints, and the joint of the pipe joints is installed on the support frame 220 and is clamped into the second clamping groove on the support plate 222 to form a fixed connection. In order to improve the stability of laying of the cable groove 210, a waterproof structural adhesive is arranged between the second clamping groove of the supporting plate 222 and the cable groove pipe joint, and the waterproof structural adhesive can effectively reinforce the cable groove 210. In one embodiment, a support frame 220 is fixedly mounted on the slope of the road shoulder 200 every two meters along the extension direction of the road.
In one embodiment, the support frame 220 is made of aluminum or a composite material. The support bracket 220 has good support strength and can ensure the stability of the cable tray 210.
In addition, in order to ensure the safety of the cable trough 210 during operation, the cable trough 210 is installed by laying, and the top surface of the cable trough 210 is arranged to be flush with the road shoulder plane. Therefore, the cable trough 210 can be effectively prevented from rushing to the line due to the influence of external forces such as trains and wind, and the traffic safety is prevented from being threatened. And, the cable duct top surface sets up and can enlarge the drainage space of cable duct 210 with the shoulder plane parallel and level. It will of course be appreciated that the top surface of the cable trough 210 may also be disposed below the shoulder plane.
Example three:
in the present embodiment, the cable groove 310 is routed in the line extending direction outside the shoulder 300.
According to the present invention, the cable groove 310 is laid on the slope surface of the road shoulder 300 by means of the buttress 320. As shown in fig. 3, the piers 320 are fixedly disposed on the slope surface of the road shoulder 300 and are uniformly spaced apart in the longitudinal direction. In one embodiment, pier 320 is a prefabricated steel sleeve, preferably a seamless steel tube. According to the invention, the steel sleeve is prefabricated together with the road shoulder concrete. The steel casing is placed longitudinally spaced apart by two meters before the construction of the road shoulder, and then poured into the slope of the road shoulder, thereby forming the buttress 320. The cable trough 310 is laid outside the shoulder 300 above the slope of the shoulder 300 by means of piers 320. The laying method of the cable trough 310 can enable the cable trough 310 to be separated from the foundation bed for laying, so that the problems of cable trough water accumulation, foundation bed soaking, roadbed drainage unsmooth and the like can be effectively avoided, the service environment of the cable is obviously improved, and the service life of the cable and the railway operation safety are guaranteed.
In this embodiment, the buttress 320 is poured in the slope of the shoulder perpendicular to the horizontal plane, the depth of the buttress 320 embedded in the shoulder 300 is not less than 0.5 m, and the support strength of the buttress 320 is greater than 200 kg. Thus, not only the support performance of the buttress can be effectively ensured, but also the stability of the cable trough 310 can be ensured.
According to the present invention, a bracket 322 is provided between the buttress 320 and the cable tray 310, the bracket 322 including a third card slot. Adjacent sub-cable grooves are connected by a pipe section, and the pipe section joint is mounted in the third card slot of the bracket 322 to form a fixed connection. In one embodiment, bracket 322 is secured to the top end of pier 320 by welding. The bracket 322 is welded at one end of the pier 320 before construction, and leveling is performed through a plane on the bracket 322 during pouring construction.
In one embodiment, buttress 320 is fabricated from aluminum or a composite material. The support strength of the buttress and the fixing strength of the cable trough are further enhanced by adopting the buttress 320 to lay the cable trough, and the stability of the cable trough 310 is effectively ensured.
Example four:
in the present embodiment, the cable groove 410 is routed in the line extending direction outside the shoulder 400.
As shown in fig. 4, the cable trough 410 may also be routed to the foothill side of the roadbed through a buttress 420. The cable trough 410 may be laid at the toe of the embankment or the cutting according to actual conditions of the railway line, and may be laid inside or outside the drainage ditch 440 according to the position of the drainage ditch 440. The arrangement mode of the cable trough 410 reduces the construction difficulty of the infrastructure, and the arrangement and construction space of the cable trough is large, so that the arrangement construction of the cable trough is changed. In addition, the cable trough 410 is arranged at the toe of the slope and is far away from the track line, so that the influence on the safety of train operation is avoided, and the roadbed structure is not influenced.
In this embodiment, the flow and manner of construction of the pier 420 are the same as those of the pier 320 in the third embodiment.
According to the invention, the cable troughs are laid in the transition working condition section by adopting transition connection. For example, at the position where the cable passes through the rail, the upper and lower roadbed sections with slopes and the transition sections such as a road bridge and a road tunnel section are arranged and constructed by adopting transition connection. The following description is directed to specific transition segments.
And in the cable track-passing section where the roadbed cable needs to pass through the track, the cable trough can form transition connection through the cable well. As shown in fig. 5, the cable wells 140 are provided on the shoulder 100 of the cutting section or the roadbed section where the cables cross the rail, and the cable wells 140 are provided on both lateral sides of the railway line. The cable trough 110 is transitionally connected by a cable well 140 and allows the cables to be laid laterally under the railway line. Thereby, the transitional laying of the cable trough 110 is completed, thereby realizing the cable cross-track laying.
In the upper roadbed section and the lower roadbed section, where roadbed cables need to go up and down the roadbed, the cable troughs can adopt three-way joints or four-way joints to form transition connection. As shown in fig. 6, the cable groove 110 is laid on the slope surface of the shoulder 100. When the road-based cable needs to be laid down along the road bed 100, the cable trough 110 is transitionally connected by the three-way joint 150 to extend a cable trough laid down along the road bed. Thereby, the laying work of the cable trough 110 transitioning downward along the roadbed 100 is completed.
As shown in fig. 7, the cable trough 110 is laid on the side of the footings of the roadbed 100. When the road-based cable needs to be laid up along the road bed 100, the cable troughs 110 are transition-connected using four-way joints 160 to extend a length of cable trough that is laid up along the road bed. Thereby, the construction of the cable trough 110 for laying the roadbed 100 in the upward transition is completed.
In addition, because the size of the cable duct adopted to the road bed section and tunnel or bridge is different, in the construction is laid to the cable duct, to operating condition, can pass through cable shaft and transit and lay. As shown in fig. 8, a cable well 540 is provided at the entrance and exit of the roadbed section 500 and the bridge 530, and the roadbed section cable trough 510 and the bridge cable trough 511 form a transition connection through the cable well 540. Thereby, the transitional laying construction of the foundation section cable trough 510 and the bridge cable trough 511 is completed.
Similarly, as shown in fig. 9, a cable well 640 is provided at the entrance and exit of the foundation section 600 and the tunnel 630, and the foundation section cable groove 610 and the tunnel cable groove 611 form a transition connection through the cable well 640. Thereby, the transitional laying construction of the foundation section cable trough 610 and the tunnel cable trough 611 is completed.
In addition, the crossing position of the embankment section inspection step and the cable groove can be subjected to transitional laying of the cable groove by arranging a cable well or a sinking groove. In one embodiment, as shown in fig. 10, two cable wells 740 are provided on both longitudinal sides of the embankment section inspection step 750, the two cable wells 740 are connected at the lower part and are located below the embankment section inspection step 750, and the longitudinal cables can be connected through the lower part of the cable wells 740. The cable trough 710 may be continuously laid by making a transition through two cable wells 740. In another embodiment, as shown in FIG. 11, cable wells 840 are provided on both longitudinal sides of embankment section inspection step 850, and a sinker 860 is provided below embankment section inspection step 850, sinker 860 extending in the longitudinal direction. At the embankment section inspection step 850, the cable trough 810 may transition through a cable well 840 and a sinker 860 to form a continuous lay. From this, meet embankment section inspection department of marking time, carry out the cable duct through cable shaft or sink and lay to accomplish the transition of cable duct and lay the construction.
The cable duct adopts transitional coupling to lay in the transition operating mode highway section, can effectively adapt to the operating condition in actual highway section, has reduced the degree of difficulty of laying of the cable duct of some special operating modes to and the stability of laying, improved the continuity that the cable duct was laid, and effectively avoided the cable to locate alternately winding in special operating mode position, made things convenient for laying of cable greatly, thereby improved the security of cable. In addition, the laying construction mode is simple and convenient, and the construction efficiency is high.
According to the method for laying the cable trough on the roadbed, the cable trough can be separated from the foundation bed to be laid, so that the problems of cable trough water accumulation, foundation bed soaking, roadbed drainage disorder and the like can be effectively avoided. In addition, the method can ensure the laying construction quality and the fixing strength of the cable duct through the support frame or the buttress, and can ensure the stability of the roadbed. Meanwhile, the cable grooves are distributed and constructed in the transition working condition road sections through transition connection, the integrity of the cable grooves can be guaranteed, the cable grooves can adapt to the laying of special working conditions such as climbing, turning and transition of different road sections, the applicability is high, the difficulty in laying the cable grooves in the transition road sections is greatly reduced, the efficiency of laying and constructing the cable grooves is improved, the safety of cables is enhanced, the service environment of the cables is improved, and the service life of the cables and the railway operation safety are guaranteed.
Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and do not limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing examples, or that equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A method of laying cable troughs on a subgrade, comprising the steps of:
providing a cable trough (110);
the cable troughs are distributed at the transition working condition section of the roadbed in a transition connection mode,
wherein, the cable duct breaks away from the bed and lays, the cable duct lays on the slope of curb through the support frame, the support frame is triangle bearing structure, the support frame is including being fixed plate (221) and backup pad (222) that the acute angle is connected to and be used for connecting the backup pad with the connecting plate (223) of fixed plate, the fixed plate is used for the slope fixed connection with the curb, the acute angle between fixed plate and the backup pad sets to equal with the angle of inclination of slope, thereby make the backup pad be parallel with the horizontal plane and be used for installing the cable duct, be equipped with the second draw-in groove in the backup pad, adjacent son cable duct forms the connection through the tube coupling, and the tube coupling junction is installed on the support frame to the card is gone into in the second draw-in groove and forms fixed connection, lay the cable duct in the toe department of the bed of road bed, the cable duct lays according to the actual position of escape canal inboard or the outside in the escape canal, the cable grooves are distributed in the transition working condition section according to the actual working condition of the actual section,
the three-way joints are adopted for transition laying in the upper and lower roadbed sections, when the roadbed cables need to be laid downwards along the slope of the roadbed, the cable troughs adopt three-way joint transition connection to extend out a section of cable trough laid along the slope direction of the roadbed, when the roadbed cables need to be laid upwards along the roadbed, the cable troughs adopt four-way joint transition connection to extend out a section of cable trough laid upwards along the roadbed,
the cable crossing place is transitionally laid by adopting a cable well, the cable well is arranged on the cutting section or the road bed shoulder of the cable crossing place, the cable well is arranged at the two transverse sides of the railway line, the cable grooves are transitionally connected by the cable well, and the cable is transversely laid below the railway line,
the cable wells are arranged at the bridge head or the tunnel inlet and the tunnel outlet for transitional laying at the road bridge and the road tunnel section,
the cable wells or the sink grooves are adopted for transitional laying in the road section provided with the embankment inspection step, the cable wells are arranged on the two longitudinal sides of the embankment section inspection step, the sink grooves are arranged below the embankment section inspection step, and the sink grooves extend along the longitudinal direction.
2. The method of claim 1, wherein the adjacent cable troughs are connected by a fixing pad (120) and fixed to the upper surface of the shoulder by an anchor bolt.
3. The method of claim 1, wherein the support bracket is positioned at a junction of adjacent cable troughs.
4. The method according to claim 1, wherein the cable trough is routed at the toe outside the shoulder using buttresses and inside or outside the gutter depending on the actual position of the gutter.
5. A method according to claim 4, wherein the buttress is a prefabricated casing and a bracket is secured to an end of the buttress, the connection of adjacent cable troughs being mounted on the bracket.
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| CN201910532554.9A CN110350464B (en) | 2019-06-19 | 2019-06-19 | Method for laying cable duct on roadbed |
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| CN201910532554.9A CN110350464B (en) | 2019-06-19 | 2019-06-19 | Method for laying cable duct on roadbed |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN207512921U (en) * | 2017-08-03 | 2018-06-19 | 上海尚域实业发展股份有限公司 | A kind of prefabricated house structure being built on slope |
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| CN203007820U (en) * | 2012-11-30 | 2013-06-19 | 中铁第四勘察设计院集团有限公司 | Excavation bridge abutment for passenger-dedicated double-line railway with speed of 350 km per hour |
| CN202928773U (en) * | 2012-12-03 | 2013-05-08 | 福建省产品质量检验研究院 | Children riding toy car loading impact testing arrangement |
| CN205591054U (en) * | 2015-12-10 | 2016-09-21 | 中铁二院工程集团有限责任公司 | High -speed railway road bed cable duct structure |
| CN206673544U (en) * | 2017-04-01 | 2017-11-24 | 中国铁路设计集团有限公司 | The light current of isolation crosses rail cable shaft in a kind of detachable pin-connected panel strong and weak electricity well |
| CN208797546U (en) * | 2018-06-28 | 2019-04-26 | 中铁第五勘察设计院集团有限公司 | A kind of cable trough |
| CN212304684U (en) * | 2020-07-08 | 2021-01-05 | 郑州铁路职业技术学院 | Cable trough for railway roadbed |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN207512921U (en) * | 2017-08-03 | 2018-06-19 | 上海尚域实业发展股份有限公司 | A kind of prefabricated house structure being built on slope |
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