CN214789599U - Concrete drain pipe and drainage pipeline - Google Patents

Abstract

The utility model relates to the technical field of drainage pipes, and provides a concrete drainage pipe, which comprises a pipe body, wherein the two ends of the pipe body are respectively a concave end and a convex end; the pipe wall of the pipe body sequentially comprises a concrete layer and a waterproof layer from outside to inside; the anti-corrosion ring is sleeved on the pipe body and can move along the axial direction and the circumferential direction of the pipe body; the inner surface of the anti-corrosion ring is provided with an inner thread section; and the two ends of the outer surface of the concrete layer are respectively provided with an external thread section matched with the internal thread section. Through set up anticorrosive ring on the body, after two body socket joint are connected, the anticorrosive ring of accessible is together fixed with two bodies, prevents to produce the displacement along its axial between two bodies, has improved the fastness of connecting between two concrete drain pipes, has avoided appearing two sections concrete drain pipe off-going circumstances in long-time use by the drainage pipe that a plurality of concrete drain pipe connection formed, has guaranteed the reliability of drainage pipe in long-time use.

Description

Concrete drain pipe and drainage pipeline

Technical Field

The utility model belongs to the technical field of the drain pipe technique and specifically relates to a concrete drain pipe and drainage pipe.

Background

Concrete pipes are pipes made of concrete or reinforced concrete and used for transporting fluids such as water, oil, gas, and the like. Currently, concrete pipes are roughly classified into plain concrete pipes, ordinary reinforced concrete pipes, self-stressed reinforced concrete pipes, and prestressed concrete pipes.

With the continuous development of city construction, the underground pipe body in modern cities is also increasing continuously, and most underground drain pipes use concrete pipes to drain water at present. Adopt socket joint structure to be connected between the concrete pipe of prior art, but this kind of connection structure only can carry on spacingly to the radial of pipeline, and can not carry on spacingly to the axial of pipeline, and then cause the fastness and the reliability of connecting between the concrete pipe poor, the condition that two sections concrete pipe declutched probably appears in the long-time use.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a concrete drain pipe and drainage pipe are provided to the fastness after connecting between the improvement concrete drain pipe.

The utility model provides a technical scheme that its technical problem adopted is: the concrete drain pipe comprises a pipe body, wherein a concave end and a convex end are respectively arranged at two ends of the pipe body; the pipe wall of the pipe body sequentially comprises a concrete layer and a waterproof layer from outside to inside;

at the notch end of the pipe body, the waterproof layer is positioned inside the concrete layer, and the distance between the end surfaces of the waterproof layer and the concrete layer is L1;

at the convex opening end of the pipe body, the waterproof layer is positioned outside the concrete layer, and the distance between the end surfaces of the waterproof layer and the concrete layer is L2;

the anti-corrosion ring is sleeved on the pipe body and can move along the axial direction and the circumferential direction of the pipe body; an inner thread section is arranged on the inner surface of the anti-corrosion ring; and the two ends of the outer surface of the concrete layer are respectively provided with an external thread section matched with the internal thread section.

Further, the length of the internal thread section on the anti-corrosion ring is greater than or equal to the sum of the lengths of the two external thread sections on the concrete layer.

Furthermore, at least two first mounting holes are uniformly distributed on the circumference of the end face, located at the notch end of the pipe body, of the concrete layer; a cross bar is arranged in the first mounting hole; one end of the cross rod extends to the outside of the first mounting hole;

and a second mounting hole which corresponds to each first mounting hole and is used for inserting the cross rod is arranged on the end surface of the concrete layer, which is positioned at the convex opening end of the pipe body.

Further, the number of the first mounting holes is four.

Furthermore, the cross rod is hinged in the first mounting hole, so that two ends of the cross rod can swing back and forth along the radial direction of the pipe body;

two ends of the cross rod are respectively a stop end and a driving end; the stop end is positioned in the first mounting hole, and the driving end is positioned outside the first mounting hole; a stop block is fixed at the stop end of the cross rod; a first through hole for the stop block to pass through is formed in the outer surface of the concrete layer;

the anti-corrosion ring is provided with a stop surface matched with the stop block; and the concrete layer is provided with a driving mechanism which extends into the second mounting hole and is used for being matched with the driving end of the cross rod.

Further, the end face of the corrosion prevention ring facing the convex end of the pipe body forms the stop face.

Further, the driving mechanism comprises a second through hole which is arranged on the outer surface of the concrete layer and communicated with the second mounting hole; the second through hole is a long strip-shaped hole extending along the axial direction of the tube body;

a driving block is slidably arranged in the second through hole; the end face of the driving block facing the second mounting hole is a driving face; a stop lever fixedly connected with the driving block is arranged outside the concrete layer;

when the driving block slides from one end of the second through hole to the other end along the direction from the convex opening end to the concave opening end of the pipe body, the driving surface gradually moves into the second mounting hole from the second through hole, and the displacement of the driving surface along the radial direction of the pipe body is gradually increased.

Furthermore, the driving block and the stop lever are of an integrally formed structure.

Furthermore, the outer surface of the anti-corrosion ring is hinged with a buckle used for being matched with the stop block in a clamping mode.

The drainage pipeline comprises at least two drainage pipes which are connected end to end; the drain pipe is a concrete drain pipe.

The utility model has the advantages that:

the concrete drain pipe provided by the embodiment of the utility model has the advantages that the socket joint connection between the two pipe bodies can be realized by arranging the two ends of the pipe bodies into the concave end and the convex end which are mutually spliced and matched, and the displacement between the two pipe bodies along the radial direction is prevented; through set up anticorrosive ring on the body, after two body socket joint are connected, the anticorrosive ring of accessible is together fixed with two bodies, prevents to produce the displacement along its axial between two bodies, has improved the fastness of connecting between two concrete drain pipes, has avoided appearing two sections concrete drain pipe off-going circumstances in long-time use by the drainage pipe that a plurality of concrete drain pipe connection formed, has guaranteed the reliability of drainage pipe in long-time use.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below; it is obvious that the drawings in the following description are only some of the embodiments described in the present application, and that other drawings can be derived from these drawings by a person skilled in the art without inventive effort.

FIG. 1 is a schematic structural view of a concrete drain pipe provided by an embodiment of the present invention;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

FIG. 3 is a partial structural view after two concrete drain pipes are connected;

FIG. 4 is a schematic structural diagram of a concrete drain pipe provided by an embodiment of the present invention;

FIG. 5 is a cross-sectional view B-B of FIG. 4;

FIG. 6 is an enlarged view at A in FIG. 4;

FIG. 7 is an enlarged view at B in FIG. 4;

FIG. 8 is a schematic view of two concrete drain pipe pairs after assembly;

fig. 9 is a schematic structural view after two concrete drain pipes are connected through a corrosion prevention ring.

The reference numbers in the figures are: 1-a pipe body, 2-a concave end, 3-a convex end, 4-a concrete layer, 5-a waterproof layer, 6-an anticorrosion ring, 7-an internal thread section, 8-an external thread section, 9-a first mounting hole, 10-a cross bar, 11-a second mounting hole, 12-a stop end, 13-a driving end, 14-a stop block, 15-a first through hole, 16-a stop surface, 17-a driving mechanism, 18-a second through hole, 19-a driving block, 20-a driving surface, 21-a stop rod, 22-a buckle, 23-a support and 24-a guide groove.

Detailed Description

In order to make the present invention better understood by those skilled in the art, the present invention will be further described with reference to the accompanying drawings and examples. It is obvious that the described embodiments are only some of the embodiments of the present invention, and not all of them. In case of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other.

FIG. 1 is a schematic structural view of a concrete drain pipe provided by an embodiment of the present invention; fig. 2 is a sectional view a-a in fig. 1.

Referring to fig. 1 and 2, a concrete drain pipe provided by the embodiment of the present invention includes a pipe body 1, and both ends of the pipe body 1 are a notch end 2 and a flange end 3 respectively; the pipe wall of the pipe body 1 sequentially comprises a concrete layer 4 and a waterproof layer 5 from outside to inside; at the notched end 2 of the pipe body 1, the waterproof layer 5 is located inside the concrete layer 4, and the distance between the end surfaces is L1; at the convex opening end 3 of the pipe body 1, the waterproof layer 5 is positioned outside the concrete layer 4, and the distance between the end surfaces is L2; the anti-corrosion device also comprises an anti-corrosion ring 6 which is sleeved on the pipe body 1 and can move along the axial direction and the circumferential direction of the pipe body 1; an internal thread section 7 is arranged on the inner surface of the anti-corrosion ring 6; and the two ends of the outer surface of the concrete layer 4 are respectively provided with an external thread section 8 matched with the internal thread section 7.

For convenience of description, the left and right directions are consistent with the left and right directions of the drawings, but do not limit the structure of the present invention.

Referring to fig. 1 and 2, the embodiment of the present invention provides a concrete drain pipe, including a pipe body 1 and an anti-corrosion ring 6.

The pipe body 1 is cylindrical, and an inner cavity of the pipe body 1 forms a channel for conveying water. The two ends of the pipe body 1 are a notch end 2 and a convex end 3 which are mutually inserted and matched; that is, the two pipe bodies 1 can be socket-connected by the mating female end 2 and male end 3.

The pipe wall of the pipe body 1 sequentially comprises a concrete layer 4 and a waterproof layer 5 from outside to inside. The concrete layer 4 may be made of plain concrete, ordinary reinforced concrete, self-stressed reinforced concrete, prestressed concrete, or the like. The waterproof layer 5 may be made of waterproof concrete, and plays a waterproof role in preventing water in the pipe body 1 from permeating to the outside of the pipe body 1 through the pipe wall. The waterproof concrete refers to concrete with impermeability grade being greater than or equal to P6 grade, and is mainly divided into four types according to configuration modes: 1. improving the waterproof concrete of the grading method; 2. the cement consumption is increased and the common waterproof concrete with the ultrafine powder filler is used; 3. waterproof concrete of admixture; 4. expansive agent concrete.

In fig. 1, the left end of the waterproof layer 5 is located inside the concrete layer 4, and the distance between the left end of the waterproof layer 5 and the left end of the concrete layer 4 is L1, so that the left end of the concrete layer 4 and the left end of the waterproof layer 5 jointly form the notch end 2 of the pipe body 1. The right-hand member of waterproof layer 5 is located the outside of concrete layer 4, and the distance between the right-hand member of waterproof layer 5 and the right-hand member of concrete layer is L2, and then forms jointly by the right-hand member of concrete layer 4 and the right-hand member of waterproof layer 5 the tang end 3 of body 1. Wherein, L1 is more than 0, and L2 is more than 0; l1 may be greater than, equal to, or less than L2, and is not specifically limited herein. Preferably, L1 ═ L2.

The anti-corrosion ring 6 is sleeved on the pipe body 1 and can reciprocate along the circumferential direction and the circumferential direction of the pipe body 1. The function of the corrosion prevention ring 6 is to fixedly connect the two pipe bodies 1 in the axial direction. An internal thread section 7 is arranged on the inner surface of the anti-corrosion ring 6, and external thread sections 8 matched with the internal thread section 7 are respectively arranged at two ends of the outer surface of the concrete layer 4.

The length of the internal thread section 7 is not specifically limited, as long as it can be ensured that when two pipe bodies 1 are connected, the internal thread section 7 can be simultaneously screwed with the external thread sections 8 at the connecting positions of the two pipe bodies 1. Preferably, the length of the internal thread section 7 on the corrosion prevention ring 6 is greater than or equal to the sum of the lengths of the two external thread sections 8 on the concrete layer 4.

The corrosion-resistant ring 6 may be made of plain concrete, ordinary reinforced concrete, self-stressed reinforced concrete or prestressed concrete, or may be made of corrosion-resistant concrete, which is not limited herein. The corrosion-resistant concrete is formed by adding a sulfate corrosion-resistant preservative into concrete, is used for resisting the corrosion action of sulfate and salt, and improves the corrosion resistance of the concrete.

The embodiment of the utility model provides a drainage pipeline, which comprises at least two drainage pipes connected end to end; the drain pipe is a concrete drain pipe.

Fig. 3 is a partial structural view after two concrete drain pipes are connected.

Referring to fig. 3, when two concrete drain pipes need to be connected together, the convex opening end 3 of the left pipe body 1 is inserted into the concave opening end 2 of the right pipe body 1, specifically, the waterproof layer 5 of the left pipe body 1 is inserted into the inner cavity of the concrete layer 4 of the right pipe body 1, and then the annular gap between the two pipe bodies 1 is sealed by a sealing material, so that the socket joint connection between the two pipe bodies 1 is realized; then, the internal thread section 7 of the anti-corrosion ring 6 is simultaneously in threaded connection with the external thread section 8 at the connecting position of the two pipe bodies 1, so that the two pipe bodies 1 are fixedly connected in the axial direction.

The concrete drain pipe provided by the embodiment of the utility model has the advantages that the socket joint connection between the two pipe bodies 1 can be realized by arranging the two ends of the pipe bodies 1 into the notch end 2 and the convex end 3 which are mutually spliced and matched, and the displacement between the two pipe bodies 1 along the radial direction is prevented; by arranging the anti-corrosion ring 6 on the pipe body 1, after the two pipe bodies 1 are connected in a socket joint mode, the two pipe bodies 1 can be fixed together through the anti-corrosion ring 6, and the two pipe bodies 1 are prevented from being displaced along the axial direction of the two pipe bodies 1; the firmness of connecting between two concrete drain pipes is improved, the condition that two concrete drain pipes are separated in the long-time use process of the drain pipe formed by a plurality of concrete drain pipes is avoided, and the reliability of the drain pipe in the long-time use process is guaranteed.

FIG. 4 is a schematic structural diagram of a concrete drain pipe provided by an embodiment of the present invention; fig. 5 is a sectional view B-B in fig. 4.

Referring to fig. 4 and 5, in the concrete drain pipe provided in the embodiment of the present invention, at least two first mounting holes 9 are uniformly distributed on the circumference of the end surface of the concrete layer 4 located at the concave end 2 of the pipe body 1; a cross bar 10 is arranged in the first mounting hole 9; one end of the cross rod 10 extends to the outside of the first mounting hole 9; and a second mounting hole 11 which corresponds to each first mounting hole 9 and is used for inserting the cross rod 10 is formed in the end surface, located at the convex opening end 3 of the pipe body 1, of the concrete layer 4.

In fig. 4, the left end of the tube body 1 is a notch end 2, and the right end of the tube body 1 is a convex end 3; two or more first mounting holes 9 are uniformly distributed on the upper circumference of the left end surface of the concrete layer 4; and a second mounting hole 11 corresponding to each first mounting hole 9 is formed in the right end surface of the concrete layer 4.

For example, the number of the first mounting holes 9 is four, the four first mounting holes 9 are uniformly distributed on the left end surface of the concrete layer 4 around the axis of the pipe body 1, and the axial direction of each first mounting hole 9 is parallel to the axial direction of the pipe body 1; a cross bar 10 is arranged in each first mounting hole 9, and the left end of the cross bar 10 extends to the outside of the first mounting hole 9; the four second mounting holes 11 are uniformly distributed on the right end face of the concrete layer 4 by taking the axis of the pipe body 1 as a center circumference, and the axial direction of each second mounting hole 11 is parallel to the axial direction of the pipe body 1.

The embodiment of the utility model provides a concrete drain pipe, through installing horizontal pole 10 in first mounting hole 9, when two bodys 1 are connected in the socket joint, accessible horizontal pole 10 plays the effect of location, connects the back when two bodys 1 socket joints for the both ends of horizontal pole 10 are arranged in corresponding first mounting hole 9 and second mounting hole 11 respectively, and then prevent through horizontal pole 10 that to produce the circumferential motion between two bodys 1, have further improved the reliability of connecting between two bodys 1.

With continued reference to fig. 4 and 5, in the concrete drain pipe provided by the embodiment of the present invention, the cross rod 10 is hinged in the first mounting hole 9, so that both ends of the cross rod 10 can swing back and forth along the radial direction of the pipe body 1; two ends of the cross rod 10 are respectively a stop end 12 and a driving end 13; the stop end 12 is positioned in the first mounting hole 9, and the driving end 13 is positioned outside the first mounting hole 9; a stop block 14 is fixed at the stop end 12 of the cross bar 10; a first through hole 15 for the stop block 14 to pass through is formed in the outer surface of the concrete layer 4; the anticorrosion ring 6 is provided with a stop surface 16 matched with the stop block 14; and the concrete layer 4 is provided with a driving mechanism 17 which extends into the second mounting hole 11 and is used for being matched with the driving end 13 of the cross rod 10.

Fig. 6 is an enlarged view at a in fig. 4. Referring to fig. 4 and 6, the cross bar 10 is of a lever structure, the bracket 23 is fixed in the first mounting hole 9, and the middle of the cross bar 10 is movably mounted on the bracket 23, so that the two ends of the cross bar 10 can swing back and forth along the radial direction of the pipe body 1 with the bracket 23 as a fulcrum. A stop 14 for cooperation with a stop surface 16 of the corrosion protection ring 6 is fixed to the stop end 12 of the cross bar 10. The stopper 14 has two states, namely a stopping state and a passing state; when the stop block 14 is in a stop state, the stop block 14 is in abutting fit with the stop surface 16 of the corrosion prevention ring 6, and is used for preventing the corrosion prevention ring 6 from moving towards the stop block 14 along the axial direction of the pipe body 1; when the stopper 14 is in the passage state, the stopper 14 is out of contact with the stop surface 16 of the corrosion protection ring 6, and the corrosion protection ring 6 can move freely in the axial direction of the pipe body 1 towards the stopper 14.

The corrosion protection ring 6 is provided with a stop surface 16 for stop matching with the stop 14. For example, an annular stop groove is provided on the inner surface of the corrosion protection ring 6, the side surface of which forms the stop surface 16. Preferably, the end surface of the corrosion prevention ring 6 facing the convex end 3 of the pipe body 1 forms the stop surface 16; in fig. 4, the stop surface 16 is the right end surface of the corrosion protection ring 6.

The driving mechanism 17 is used for providing a driving force to the driving end 13 of the cross bar 10 during the connection of the two pipe bodies 1, so that the cross bar 10 rotates around the bracket 23 to lock the stopper 14 fixed on the stopping end 12 of the cross bar 10 in the stopping state.

The driving mechanism 17 can be a threaded shaft arranged along the radial direction of the pipe body 1; and a threaded hole is formed in the outer surface of the concrete layer 4 and corresponds to the second mounting hole 11, the threaded hole is communicated with the second mounting hole 11, and the threaded shaft is mounted in the threaded hole. In the process of connecting the two pipe bodies 1, the inner end of the threaded shaft can extend into the second mounting hole 11 and contact with the driving end 13 of the cross rod 10 only by rotating the threaded shaft, so that the driving end 13 of the cross rod 10 is provided with driving force, and the cross rod 10 rotates around the bracket 23 to lock the stop block 14 fixed on the stop end 12 of the cross rod 10 in the stop state.

FIG. 7 is an enlarged view at B in FIG. 4; a preferred embodiment of the drive mechanism 17 is shown in fig. 7.

Referring to fig. 4 and 7, the driving mechanism 17 includes a second through hole 18 disposed on the outer surface of the concrete layer 4 and communicating with the second mounting hole 11; the second through hole 18 is a strip-shaped hole extending along the axial direction of the pipe body 1; a driving block 19 is arranged in the second through hole 18 in a sliding manner; the end surface of the driving block 19 facing the second mounting hole 11 is a driving surface 20; a stop lever 21 fixedly connected with the driving block 19 is arranged outside the concrete layer 4; when the driving block 19 slides from one end to the other end of the second through hole 18 in the direction from the male end 3 to the female end 2 of the pipe body 1, the driving surface 20 gradually moves from the inside of the second through hole 18 to the inside of the second mounting hole 11, and the displacement of the driving surface 20 in the radial direction of the pipe body 1 gradually increases.

The driving block 19 is slidably mounted in the second through hole 18 by a guide means so that the driving block 19 slides in a specific direction. For example, the guide means includes guide grooves 24 provided on both side surfaces of the second passage 18; the guide groove 24 is a long groove which is arranged along the direction from the convex opening end 3 to the concave opening end 2 of the tube body 1 and gradually inclines towards the center of the tube body 1; a sliding block which can slide along the guide groove 24 is arranged in the guide groove 24, and the sliding block is fixedly connected with the driving block 19. And a stop lever 21 fixedly connected with the driving block 19 is arranged outside the concrete layer 4. Preferably, the driving block 19 and the stop lever 21 are integrally formed. Referring to fig. 7, when a leftward force is applied to the blocking lever 21, the blocking lever 21 drives the driving block 19 to move leftward in the second channel 18, and under the guiding action of the guiding slot 24 and the sliding block, the driving surface 20 of the driving block 19 gradually moves from the second through hole 18 to the second mounting hole 11, and the driving surface 20 gradually moves toward the center of the tube body 1.

FIG. 8 is a schematic view of two concrete drain pipe pairs after assembly; fig. 9 is a schematic structural view after two concrete drain pipes are connected through a corrosion prevention ring.

Referring to fig. 8, when two concrete drain pipes need to be connected together, the convex end 3 of the left pipe body 1 is inserted into the concave end 2 of the right pipe body 1, specifically, the waterproof layer 5 of the left pipe body 1 is inserted into the inner cavity of the concrete layer 4 of the right pipe body 1, then the annular gap between the two pipe bodies 1 is sealed by a sealing material, socket joint connection between the two pipe bodies 1 is further realized, then the corrosion-resistant ring 6 is moved leftwards, so that the internal thread section 7 of the corrosion-resistant ring 6 is simultaneously in threaded connection with the external thread section 8 at the connection position of the two pipe bodies 1, and the two pipe bodies 1 are fixedly connected in the axial direction. Referring to fig. 9, the corrosion-resistant ring 6 is moved to the left, the left end of the corrosion-resistant ring 6 contacts with the stopper rod 21 and pushes the stopper rod 21 to move to the left, the driving block 19 is driven by the stopper rod 21 to move to the left, the driving surface 20 of the driving block 19 applies a downward acting force to the driving end 13 of the cross rod 10, so that the stopping end 12 of the cross rod 10 moves upward, when the stopper rod 21 moves to the limit position of the left end to the left, the stopper 14 protrudes from the first through hole 15 to the right side of the stopping surface 16 of the corrosion-resistant ring 6 and is in abutting fit with the stopping surface 16, and at this time, the stopper rod 21 and the stopper 14 limit the two ends of the corrosion-resistant ring 6, so as to prevent the corrosion-resistant ring 6 from moving along the axial direction of the pipe body 1.

In order to further improve the firmness of the connection of the corrosion prevention ring 6, it is preferable that a buckle 22 for snap-fit with the stopper 14 is hinged on the outer surface of the corrosion prevention ring 6. Referring to fig. 9, after the two concrete drain pipes are connected, the buckle 22 is clamped on the stopper 14 matched with the concrete drain pipes, so that the firmness of connection between the corrosion-resistant ring 6 and the two pipe bodies 1 is improved.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. 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 (10)

1. The concrete drain pipe comprises a pipe body (1), wherein a notch end (2) and a convex opening end (3) are respectively arranged at two ends of the pipe body (1); the pipe is characterized in that the pipe wall of the pipe body (1) sequentially comprises a concrete layer (4) and a waterproof layer (5) from outside to inside;

at the notch end (2) of the pipe body (1), the waterproof layer (5) is positioned inside the concrete layer (4), and the distance between the end surfaces of the waterproof layer and the concrete layer is L1;

at the convex opening end (3) of the pipe body (1), the waterproof layer (5) is positioned outside the concrete layer (4), and the distance between the end surfaces is L2;

the anti-corrosion device also comprises an anti-corrosion ring (6) which is sleeved on the pipe body (1) and can move along the axial direction and the circumferential direction of the pipe body (1); an internal thread section (7) is arranged on the inner surface of the anti-corrosion ring (6); and the two ends of the outer surface of the concrete layer (4) are respectively provided with an external thread section (8) matched with the internal thread section (7).

2. Concrete drain pipe according to claim 1, characterized in that the length of the female thread section (7) on the corrosion protection ring (6) is greater than or equal to the sum of the lengths of the two male thread sections (8) on the concrete layer (4).

3. Concrete drain pipe according to claim 1, characterised in that the concrete layer (4) is provided with at least two first mounting holes (9) circumferentially and evenly on the end face of the pipe body (1) at the notched end (2); a cross rod (10) is arranged in the first mounting hole (9); one end of the cross rod (10) extends to the outside of the first mounting hole (9);

and a second mounting hole (11) which corresponds to each first mounting hole (9) and is used for inserting the cross rod (10) is formed in the end face, located at the convex opening end (3) of the pipe body (1), of the concrete layer (4).

4. Concrete drain pipe according to claim 3, characterized in that the number of first mounting holes (9) is four.

5. Concrete drain pipe according to claim 3, characterized in that the cross-bar (10) is hinged inside the first mounting hole (9) so that the two ends of the cross-bar (10) can oscillate reciprocally in the radial direction of the pipe body (1);

two ends of the cross rod (10) are respectively a stop end (12) and a driving end (13); the stop end (12) is positioned in the first mounting hole (9), and the driving end (13) is positioned outside the first mounting hole (9); a stop block (14) is fixed at the stop end (12) of the cross bar (10); a first through hole (15) for the stop block (14) to pass through is formed in the outer surface of the concrete layer (4);

a stop surface (16) matched with the stop block (14) is arranged on the anticorrosion ring (6); and the concrete layer (4) is provided with a driving mechanism (17) which extends into the second mounting hole (11) and is matched with the driving end (13) of the cross rod (10).

6. Concrete drain pipe according to claim 5, characterized in that the end surface of the corrosion protection ring (6) facing the pipe body (1) at the flange end (3) forms the stop surface (16).

7. Concrete drain pipe according to claim 5, characterized in that the driving means (17) comprises a second through hole (18) provided on the outer surface of the concrete layer (4) and communicating with the second mounting hole (11); the second through hole (18) is a long-strip-shaped hole extending along the axial direction of the pipe body (1);

a driving block (19) is arranged in the second through hole (18) in a sliding way; the end face of the driving block (19) facing the second mounting hole (11) is a driving surface (20); a stop lever (21) fixedly connected with the driving block (19) is arranged outside the concrete layer (4);

when the driving block (19) slides from one end of the second through hole (18) to the other end along the direction from the convex opening end (3) to the concave opening end (2) of the pipe body (1), the driving surface (20) gradually moves from the second through hole (18) to the second mounting hole (11), and the displacement of the driving surface (20) along the radial direction of the pipe body (1) is gradually increased.

8. Concrete drain pipe according to claim 7, characterized in that the driving block (19) and the stop lever (21) are of one-piece construction.

9. Concrete drain pipe according to claim 5, 6, 7 or 8, characterized in that a snap (22) for snap-fitting with the stopper (14) is hinged on the outer surface of the corrosion protection ring (6).

10. The drainage pipeline comprises at least two drainage pipes which are connected end to end; characterized in that the drain pipe is a concrete drain pipe according to any one of claims 1 to 9.

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