CN211498544U - Prefabricated square culvert convenient to connect - Google Patents
Prefabricated square culvert convenient to connect Download PDFInfo
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- CN211498544U CN211498544U CN201922055974.0U CN201922055974U CN211498544U CN 211498544 U CN211498544 U CN 211498544U CN 201922055974 U CN201922055974 U CN 201922055974U CN 211498544 U CN211498544 U CN 211498544U
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Abstract
The utility model discloses a prefabricated square culvert convenient for connection, belonging to the municipal construction field; the technical scheme is characterized by comprising a plurality of connecting square culverts and isolating square culverts, wherein a plurality of through holes are formed in both ends of each of the connecting square culverts and the isolating square culverts, and the through holes are uniformly distributed around the end parts of the connecting square culverts and the isolating square culverts; the rectangular channel that communicates with the through-hole all sets up on the inner wall of connecting the square culvert and keeping apart the square culvert, and it has connecting bolt to peg graft in the through-hole, and connecting bolt's both ends are in the rectangular channel on connecting the square culvert and keeping apart the square culvert respectively, and the equal threaded connection in both ends of connecting bolt has the nut. The utility model provides a relatively poor problem of connectivity between prefabricated square culvert.
Description
Technical Field
The utility model relates to a municipal construction field, in particular to prefabricated square culvert convenient to connect.
Background
The culvert is a drainage channel (water channel) which is arranged below a roadbed and built below a road surface in order to ensure that a road can smoothly pass through a water channel without obstructing traffic in the construction of highway engineering, and water can flow through the lower surface of the road through the structure;
at present, in order to improve the construction progress, the construction process of splicing the prefabricated square culvert on site is generally adopted, but the problem of poor connectivity exists between the square culverts of the splicing, and water leakage easily occurs at the joint of the square culverts.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a prefabricated square culvert convenient to connect, it has the characteristics that increase connectivity between the square culvert.
The above object of the present invention can be achieved by the following technical solutions: a prefabricated square culvert convenient to connect comprises a plurality of connecting square culverts and isolating square culverts, wherein a plurality of through holes are formed in both ends of each of the connecting square culverts and the isolating square culverts, and the through holes are uniformly distributed around the end parts of the connecting square culverts and the isolating square culverts;
the rectangular channel that communicates with the through-hole all sets up on the inner wall of connecting the square culvert and keeping apart the square culvert, and it has connecting bolt to peg graft in the through-hole, and connecting bolt's both ends are in the rectangular channel on connecting the square culvert and keeping apart the square culvert respectively, and the equal threaded connection in both ends of connecting bolt has the nut.
Through adopting above-mentioned technical scheme, screw up the nut, and the lateral wall laminating of nut and rectangular channel, so the power of mutual gathering can be applyed with the isolation square culvert to adjacent connection square culvert to the cooperation of nut and connecting bolt, and then connect the square culvert and keep apart the connection that the square culvert can be stable together, increase the stability of connecting.
The utility model discloses further set up to: the connecting square culvert and the isolating square culvert are arranged at intervals and are connected end to end;
connect the equal fixedly connected with in both ends many wire rope of square culvert, be equipped with a plurality of turn buckle on the surface of keeping apart the square culvert, turn buckle's both ends all are equipped with rather than screw-thread fit's connecting rod, and turn buckle's one end and wire rope fixed connection are kept away from to the connecting rod.
Through adopting above-mentioned technical scheme, connect the square culvert and keep apart the square culvert back of splicing each other, connecting rod and basket of flowers bolt threaded connection make connecting rod and basket of flowers bolt rotate relatively, just can make two connection square culverts gather each other, extrude the isolation square culvert that is in between two connection square culverts, and then accomplish the concatenation work that the connection square culvert and keep apart the square culvert, the section of jurisdiction concatenation bolt that compares, it is more convenient to operate, and then can improve the efficiency of construction.
The utility model discloses further set up to: keep apart the surface of square culvert and offer the recess that can hold the steel wire, the length direction of recess is the same with the length direction of keeping apart the square culvert, keeps apart the square culvert and offers the holding tank that can hold turn buckle on the surface, recess and holding tank intercommunication.
Through adopting above-mentioned technical scheme, the recess can hold wire rope, plays spacing purpose to wire rope, makes wire rope can not produce the skew, and two connection side of straining that can be better are contained, and the holding tank can supply basket of flowers bolt's rotation, and the surface of avoiding keeping apart the side and containing causes the influence to basket of flowers bolt's rotation.
The utility model discloses further set up to: a vertical supporting plate is fixedly connected in the accommodating groove, and a connecting rod is inserted in the supporting plate;
the connecting rod set up the spacing plane of two symmetries on the surface, and spacing plane extends along the axis direction of connecting rod, has seted up spacing hole in the backup pad, spacing hole can with the spacing plane cooperation on the connecting rod, make the connecting rod only can remove along the axis direction of self and can not rotate along the axis of self.
Through adopting above-mentioned technical scheme, spacing hole and spacing planar cooperation can prevent that the connecting rod from rotating along with the turn buckle, avoids wire rope to take place the distortion, can not lead to the fact the influence to wire rope's intensity, improves wire rope's life, and also need not go to restrict the connecting rod with the staff simultaneously, and convenient operation improves the efficiency of work.
The utility model discloses further set up to: the limiting hole is long-strip-shaped, extends along the length direction of the supporting plate and enables the connecting rod to slide up and down.
Through adopting above-mentioned technical scheme, the connecting rod can reciprocate, at the in-process of backfilling, the backfill soil to can pressing basket bolt downstream, and then can stimulate two adjacent connection square culverts and be close to each other, and keep apart the square culverts simultaneously and be in between two connection square culverts, so can further increase the connectivity, reduce the probability that connection square culverts and isolation square culverts produced leaking.
The utility model discloses further set up to: a cover plate is further arranged in the groove and is in interference fit with the groove, a wood board is laid on the accommodating groove, and the thickness of the wood board is 5-10 cm;
the junction of keeping apart the square culvert and connecting the square culvert and keep apart all to have laid the one deck pitch cream on the surface of square culvert, the pitch cream can cover apron, plank, connecting the square culvert and the junction of keeping apart the square culvert.
By adopting the technical scheme, the cover plate and the wood plate can prevent soil from entering the groove and the accommodating groove, so that influence on the turn buckle is avoided, and the turn buckle and the connecting rod can be normally separated when the connecting square culvert is replaced or the isolating square culvert is isolated; the asphalt cement can increase the leakproofness between apron and the recess, between plank and the holding tank, avoids during moisture permeates into recess and holding tank, and the plank atress can fracture, makes turn-key bolt can the atress produce and remove, and the asphalt cement can prevent that earth and moisture from getting into the holding tank this moment.
The utility model discloses further set up to: the edge parts of the two end parts of the connecting square culvert, which are close to the bottom surface of the groove, are not provided with fixed steel wire ropes, and the lower surface of the isolating square culvert is not provided with turn bolts.
Through adopting above-mentioned technical scheme, make wire rope and turn buckle can not lead to the fact the influence to the slip of connecting the square culvert and keeping apart the square culvert, make things convenient for the concatenation of connecting the square culvert and keeping apart the square culvert.
The utility model discloses further set up to: the edge of the groove close to one end of the accommodating groove is provided with a round angle.
Through adopting above-mentioned technical scheme, there is the difference in height recess and holding tank, so can form the edge, and sharp edge causes the damage to wire rope easily, and the fillet replaces sharp edge and can avoid causing wearing and tearing to wire rope, makes wire rope's intensity toughness can not receive the influence.
The utility model discloses further set up to: the isolation square culvert and the connection square culvert are both provided with backing plates, the backing plates are laid in the grooves, and the upper surfaces of the backing plates, the isolation square culvert and the connection square culvert are smooth surfaces.
Through adopting above-mentioned technical scheme, reduce the frictional force of connecting the square culvert, keeping apart between square culvert and the backing plate, and then conveniently connect the slip of square culvert and keeping apart the square culvert, speed when improving the concatenation and connecting the square culvert and keeping apart the square culvert, and then improve the efficiency of construction.
To sum up, the utility model discloses following beneficial effect has:
1. through the matching of the connecting square culvert and the isolating square culvert, the square culvert can be spliced more quickly, the time for splicing the square culvert can be shortened through the matching of the steel wire rope and the turn buckle, the connecting stability is improved, the splicing of the square culvert is more stable, and the construction efficiency is improved;
2. the ditch inslot is equipped with the backing plate, and the backing plate can play the effect of support to the square culvert, reduces to produce sunken probability, and the lower surface of backing plate, the lower surface of connecting the square culvert and keeping apart the square culvert be glossy surface, makes things convenient for the removal of connecting the square culvert and keeping apart the square culvert more, improves the efficiency of work.
Drawings
FIG. 1 is an exploded schematic view of a connecting square culvert and an isolating square culvert in an embodiment;
FIG. 2 is a sectional view taken along line A-A of FIG. 1;
FIG. 3 is an enlarged view of portion B of FIG. 2;
FIG. 4 is a schematic diagram of splicing a connecting square culvert and an isolating square culvert in the embodiment;
FIG. 5 is a top view of the highlighted turn buckle of the embodiment;
FIG. 6 is an enlarged view of portion C of FIG. 4;
FIG. 7 is a schematic view of an embodiment square contained within a trench;
fig. 8 is an enlarged view of a portion D in fig. 7.
In the figure, 1, a square culvert is connected; 11. a through hole; 12. a rectangular groove; 13. a connecting bolt; 14. a nut; 15. a wire rope; 2. isolating the square culvert; 21. a turn buckle; 22. a groove; 221. round corners; 222. a cover plate; 23. accommodating grooves; 231. a wood board; 24. a connecting rod; 241. a limiting plane; 25. a support plate; 251. a limiting hole; 3. a base plate; 4. asphalt paste; 5. a waterproof rubber mat.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The first embodiment is as follows: the utility model provides a prefabricated square culvert convenient to connect, as shown in figure 1 and figure 2, includes that a plurality of connection square culverts 1 and isolation square culvert 2, the mutual concatenation of connection square culvert 1 and isolation square culvert 2 can constitute underground square culvert, does not need the construction site to pour the square culvert, and then can improve the efficiency of construction.
As shown in fig. 2 and 3, a plurality of through holes 11 are formed at both ends of the connecting square culvert 1 and the isolating square culvert 2, the plurality of through holes 11 are uniformly distributed along the end portions of the connecting square culvert 1 and the isolating square culvert 2, a plurality of rectangular grooves 12 are formed on the inner walls of the connecting square culvert 1 and the isolating square culvert 2, the rectangular grooves 12 are annularly distributed along the inner walls of the connecting square culvert 1 and the isolating square culvert 2, and the rectangular grooves 12 are communicated with the through holes 11; a connecting bolt 13 is inserted in the through hole 11, two ends of the connecting bolt 12 are respectively positioned in rectangular grooves 12 on the connecting square culvert 1 and the isolating square culvert 2, nuts 14 are respectively arranged in the rectangular grooves 12 on the connecting square culvert 1 and the isolating square culvert 2, the nuts 14 are in threaded connection with the connecting bolt 13, and the nuts 14 and the rectangular grooves 12 are attached to the side wall of one side, connected with the through hole 11; therefore, the tightening nuts 14 can enable the adjacent connecting square culvert 1 and the isolating square culvert 2 to be tightly attached together, the connecting bolts 13 distributed annularly can enable the adjacent connecting square culvert 1 and the isolating square culvert 2 to be connected more stably, and the leakage probability is reduced.
As shown in fig. 4 and 5, the isolation square culvert 2 is positioned between two adjacent connecting square culverts 1 to separate the two connecting square culverts 1, so that the isolation square culvert 2 and the connecting square culvert 1 are separated from each other; the two ends of the connecting square culvert 1 are fixedly connected with a plurality of steel wire ropes 15, and the outer surface of the isolating square culvert 2 is provided with a plurality of turn bolts 21; one end of the steel wire rope 15, which is far away from the connecting square culvert 1, extends to the direction of the isolating square culvert 2 and is connected with the turn buckle 21; so basket bolts 21 can make the connecting square culvert 1 at isolation square culvert 2 both ends link together, and the connecting square culvert 1 at isolation square culvert 2 both ends can be close to each other under wire rope 15 and basket bolts 21's cooperation, and two adjacent connecting square culverts 1 are to the extrusion of 2 application of force of isolation square culvert between the two, can make three interconnect together, and then accomplish the concatenation of the square culvert in advance, and convenient and fast can improve the efficiency of work.
As shown in fig. 5 and 6, a groove 22 capable of accommodating the steel wire rope 15 and an accommodating groove 23 capable of accommodating the turn buckle 21 are formed on the upper surface of the isolation square culvert 2; the groove 22 and the accommodation groove 23 communicate with each other; and the turn buckle 21 can rotate in the holding tank 23, and then can avoid keeping apart square culvert 2 and cause the interference to turn buckle 21's rotation, the turn buckle 21's of being convenient for rotation.
As shown in fig. 5 and 6, both ends of the turn buckle 21 are provided with connecting rods 24 in threaded fit with the turn buckle, and one end of each connecting rod 24 far away from the turn buckle 21 is fixedly connected with the steel wire rope 15; two vertical support plates 25 are fixedly connected in each accommodating groove 23, the two support plates 25 are positioned at two ends of the turn buckle 21, limiting holes 251 are formed in the support plates 25, and the limiting holes 251 are long-strip-shaped and extend along the length direction of the support plates 25; two symmetrical limiting planes 241 are arranged on the circumferential surface of the connecting rod 24, the connecting rod 24 can be inserted into the limiting hole 251, and the limiting planes 241 are attached to the side wall of the limiting hole 251; therefore, the connecting rod 24 can move along the self direction in the limiting hole 251 and can also move up and down, but the connecting rod 24 cannot rotate, so that when the turn-buckle 21 is turned, the connecting rod 24 cannot rotate along with the turn-buckle 21, the steel wire rope 15 cannot be twisted, and the service life of the steel wire rope 15 is prolonged; and after the construction is accomplished, when backfilling, need compress tightly the backfill, the backfill can be to the basket of flowers bolt 21 application of force, makes basket of flowers bolt 21 can the downstream, and then can make two connection square culverts 1 have the trend of downstream, further increases the connectivity between connection square culvert 1 and the isolation square culvert 2.
As shown in fig. 6, fillet 221 has all been seted up to the edge of recess 22 and holding tank 23 junction, and holding tank 23 is darker than the degree of depth of recess 22, and so when the hand sink of turn buckle 21, wire rope 15 produced the friction with the edge department of recess 22 easily, and sharp edge causes wearing and tearing to wire rope 15 easily, and fillet 221 can replace sharp edge, and the construction is to the wearing and tearing that wire rope 15 caused, and then improves wire rope 15's life.
As shown in fig. 4 and 7, the cover plate 222 is covered in the groove 22, the cover plate 222 is in interference fit with the groove 22, the wood plate 231 is embedded in the accommodating groove 23, and the thickness of the wood plate 231 is 5-10 cm; thereby preventing the backfill soil from entering the groove 22 and the accommodating groove 23 and avoiding affecting the use of the turn buckle 21.
As shown in fig. 7, the backing plates 3 are arranged below the connecting square culvert 1 and the isolating square culvert 2, the backing plates 3 are laid in the grooves, the upper surfaces of the backing plates 3 and the lower surfaces of the connecting square culvert 1 and the isolating square culvert 2 are smooth surfaces, so that the connecting square culvert 1 and the isolating square culvert 2 can be conveniently spliced, and the end parts of the two ends of the connecting square culvert 1, which are close to the backing plates 3, are not provided with the fixed steel wire ropes 15, so that the lower surface of the isolating square culvert 2 is also not provided with the turn buckle bolts 21; the sliding of the connecting square culvert 1 and the isolating square culvert 2 on the backing plate 3 can not be influenced.
As shown in fig. 7 and 8, a layer of asphalt cement 4 is laid at the joint of the connecting square culvert 1 and the isolating square culvert 2, the wood board 231 and the cover plate 222 are also covered by the asphalt cement 4, and the asphalt cement 4 can prevent moisture in the ground from permeating into the groove 22 and the accommodating groove 23, so that the influence on the basket bolt 21 and the steel wire rope 15 is avoided.
As shown in fig. 7 and 8, the both ends of keeping apart the square culvert 2 all inlay and be equipped with waterproof cushion 5, waterproof cushion 5 can advance sealedly to keeping apart the square culvert 2 and connect the space between the square culvert 1, avoids producing the phenomenon of leaking, so can lay pipeline or circuit etc. in the square culvert, moisture in the earth can not permeate into the square culvert in, avoids causing the influence to the circuit, and the square culvert is regarded as sewage discharge pipeline, also can not produce the phenomenon of sewage leakage.
Example two: a construction process of a prefabricated square culvert convenient for connection comprises the following steps:
path sealing: the method comprises the following steps of (1) sealing a road to be constructed by using a roadblock, delineating a construction area, and setting a warning board to avoid collision between vehicles and the roadblock and remind the vehicles and pedestrians of paying attention to avoidance during construction;
excavating: excavating a groove with proper length and width in a construction area, determining the construction area, and compacting the bottom surface of the groove to avoid sinking;
laying: a backing plate 3 made of concrete in advance is laid in the groove, the backing plate 3 is flatly laid on the bottom surface of the groove, and the backing plate 3 can play a role in supporting a prefabricated square culvert and preventing the sinking phenomenon;
polishing: the upper surface of the backing plate 3, the lower surfaces of the connecting square culvert 1 and the isolating square culvert 2 are polished smoothly, when the connecting square culvert 1 and the isolating square culvert 2 are spliced, the connecting square culvert 1 or the isolating square culvert 2 is required to slide, the upper surface of the backing plate 3, the lower surfaces of the connecting square culvert 1 and the isolating square culvert 2 are polished, the friction force among the connecting square culvert 1, the isolating square culvert 2 and the backing plate 3 can be reduced, and the sliding of the connecting square culvert 1 and the isolating square culvert 2 is facilitated;
splicing: the connecting square culvert 1 and the isolating square culvert 2 are hoisted into the grooves at intervals to be spliced, the connecting square culvert 1 and the isolating square culvert 2 are hoisted into the grooves at intervals and distributed, and then the connecting square culvert 1 and the isolating square culvert 2 are aligned end to be connected;
connecting: the connecting square culvert 1 and the isolating square culvert 2 can be connected together through the steel wire rope 15 and the turnbuckle 21, so that the construction is convenient and rapid, and the construction speed is improved;
isolation: the grooves 22 and the accommodating grooves 23 are covered by the cover plates 222 and the wood plates 231, then asphalt cement 4 on one side is paved at the joint of the connecting square culvert 1 and the isolating square culvert 2 and on the surface of the isolating square culvert 2, the asphalt cement 4 can play a role in sealing, and the influence on the basket bolts 21 and the steel wire ropes 15 caused by back filling and water diversion in the ground is avoided; when the connecting square culvert 1 or the isolating square culvert 2 is replaced, the asphalt cement 4 is convenient to remove, so that the connecting square culvert 1 and the isolating square culvert 22 are convenient to replace;
backfilling: backfilling the trench with backfill soil, compacting, backfilling the soil dug out during trench digging, and burying the square culvert underground.
Can reduce the required time of concatenation square culvert through above step, and then can carry the speed of construction, reduce the time of sealing the way, can accomplish laying of square culvert in the short time, reduce and lead to the fact the influence to the vehicle is current, can reduce the probability that takes place the incident on the road.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.
Claims (9)
1. The utility model provides a prefabricated square culvert convenient to connect which characterized in that: comprises a plurality of connecting square culverts (1) and isolating square culverts (2);
a plurality of through holes (11) are formed in the two ends of the connecting square culvert (1) and the isolating square culvert (2), and the through holes (11) are uniformly distributed around the end parts of the connecting square culvert (1) and the isolating square culvert (2);
rectangular channel (12) that communicate with through-hole (11) all set up on the inner wall of connecting square culvert (1) and keeping apart square culvert (2), it has connecting bolt (13) to peg graft in through-hole (11), and the both ends of connecting bolt (13) are in rectangular channel (12) on connecting square culvert (1) and keeping apart square culvert (2) respectively, and the equal threaded connection in both ends of connecting bolt (13) has nut (14).
2. The prefabricated square culvert convenient to connect of claim 1, wherein: the connecting square culvert (1) and the isolating square culvert (2) are arranged at intervals, and the connecting square culvert (1) and the isolating square culvert (2) are connected end to end;
the steel wire rope connecting device is characterized in that a plurality of steel wire ropes (15) are fixedly connected to two ends of the square culvert (1) in a connecting mode, a plurality of turn bolts (21) are arranged on the outer surface of the isolation square culvert (2), connecting rods (24) in threaded fit with the turn bolts (21) are arranged at two ends of the turn bolts (21), and one ends of the connecting rods (24) far away from the turn bolts (21) are fixedly connected with the steel wire ropes (15).
3. The prefabricated square culvert convenient to connect of claim 2, wherein: keep apart the surface of square culvert (2) and offer recess (22) that can hold the steel wire, the length direction of recess (22) is the same with the length direction of keeping apart square culvert (2), keeps apart square culvert (2) and offers holding tank (23) that can hold turn buckle (21) on the surface, recess (22) and holding tank (23) intercommunication.
4. The prefabricated square culvert convenient to connect of claim 3, wherein: a vertical supporting plate (25) is fixedly connected in the accommodating groove (23), and the connecting rod (24) is inserted in the supporting plate (25);
two symmetrical limiting planes (241) are arranged on the surface of the connecting rod (24), the limiting planes (241) extend along the axis direction of the connecting rod (24), a limiting hole (251) is arranged on the supporting plate (25), the limiting hole (251) can be matched with the limiting planes (241) on the connecting rod (24), and the connecting rod (24) can only move along the axis direction of the connecting rod and cannot rotate along the axis of the connecting rod.
5. The prefabricated square culvert convenient to connect of claim 4, wherein: the limiting hole (251) is in a long strip shape, and the limiting hole (251) extends along the length direction of the supporting plate (25) to enable the connecting rod (24) to slide up and down.
6. The prefabricated square culvert convenient to connect of claim 3, wherein: a cover plate (222) is further arranged in the groove (22), the cover plate (222) is in interference fit with the groove (22), a wood board (231) is laid on the accommodating groove (23), and the thickness of the wood board (231) is 5-10 cm;
one layer of asphalt cement (4) is laid on the surfaces of the joints of the isolation square culvert (2) and the connection square culvert (1) and the isolation square culvert (2), and the asphalt cement (4) can cover the joints of the cover plate (222), the wood plate (231), the connection square culvert (1) and the isolation square culvert (2).
7. The prefabricated square culvert convenient to connect of claim 2, wherein: the edge parts of the two end parts of the connecting square culvert (1) close to the bottom surface of the groove are not provided with fixed steel wire ropes (15), and the lower surface of the isolating square culvert (2) is not provided with turn-buckle bolts (21).
8. The prefabricated square culvert convenient to connect of claim 3, wherein: a fillet (221) is formed at the edge of the groove (22) close to one end of the accommodating groove (23).
9. The prefabricated square culvert convenient to connect of claim 1, wherein: the isolation square culvert (2) and the connection square culvert (1) are both provided with a backing plate (3), the backing plate (3) is laid in the groove, and the upper surface of the backing plate (3), the isolation square culvert (2) and the lower surface of the connection square culvert (1) are smooth surfaces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922055974.0U CN211498544U (en) | 2019-11-23 | 2019-11-23 | Prefabricated square culvert convenient to connect |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922055974.0U CN211498544U (en) | 2019-11-23 | 2019-11-23 | Prefabricated square culvert convenient to connect |
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| CN211498544U true CN211498544U (en) | 2020-09-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111139753A (en) * | 2019-11-23 | 2020-05-12 | 北京市市政二建设工程有限责任公司 | Prefabricated square culvert convenient to connect and construction process thereof |
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2019
- 2019-11-23 CN CN201922055974.0U patent/CN211498544U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111139753A (en) * | 2019-11-23 | 2020-05-12 | 北京市市政二建设工程有限责任公司 | Prefabricated square culvert convenient to connect and construction process thereof |
| CN111139753B (en) * | 2019-11-23 | 2024-04-05 | 北京市市政二建设工程有限责任公司 | Prefabricated square culvert convenient to connect and construction process thereof |
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