阅读说明：本技术 建筑内二次防排水结构及其施工方法 (Secondary water-proof and drainage structure in building and construction method thereof ) 是由 冼世明 劳毅雄 宋文均 陈永灿 于 2021-10-14 设计创作，主要内容包括：本发明涉及卫生间防水施工的领域,尤其是涉及一种建筑内二次防排水结构及其施工方法,其包括排水立管与导流管,所述排水立管贯穿设置在底板上且由下往上依次贯穿回填层与混凝土层,所述导流管设置于排水立管的侧壁且整体位于回填层中,所述导流管的一端与排水立管相连通、另一端与回填层相连通,所述导流管的一端设置有第一过滤组件。本申请具有减少水分在回填层内的积聚,提高人们生活质量的效果。(The invention relates to the field of waterproof construction of toilets, in particular to a secondary waterproof and drainage structure in a building and a construction method thereof. The application has the effects of reducing the accumulation of moisture in the backfill layer and improving the life quality of people.)

1. The utility model provides a secondary drainage structures of preventing in building which characterized in that: including drainage riser (1) and honeycomb duct (2), drainage riser (1) runs through to set up on bottom plate (3) and runs through backfill layer (4) and concrete layer (5) from bottom to top in proper order, honeycomb duct (2) set up in the lateral wall of drainage riser (1) and wholly are located backfill layer (4), the one end and the drainage riser (1) of honeycomb duct (2) are linked together, the other end is linked together with backfill layer (4), the one end of honeycomb duct (2) is provided with first filtering component.

2. The secondary waterproof and drainage structure in a building according to claim 1, wherein: the first filtering component comprises a mounting ring (20) which is sleeved on the guide pipe (2) and is far away from one end of the vertical drainage pipe (1), and a first filtering net (21) which is arranged on one side of the mounting ring (20) and is positioned at an opening of the guide pipe (2) and is far away from one end of the vertical drainage pipe (1).

3. The secondary waterproof and drainage structure in a building according to claim 1, wherein: the periphery of the vertical drainage pipe (1) is provided with a second filtering assembly, and the second filtering assembly is integrally positioned on the side wall of the vertical drainage pipe (1) and close to the flow guide pipe (2).

4. The secondary waterproof and drainage structure in a building according to claim 3, wherein: the second filtering component comprises a positioning sleeve (10) arranged on the peripheral side of the vertical drainage pipe (1), a second filtering net (11) which is annularly arranged on the positioning sleeve (10) and is integrally positioned on the peripheral side of the vertical drainage pipe (1), and filtering filler (12) arranged between the second filtering net (11) and the vertical drainage pipe (1).

5. The secondary waterproof and drainage structure in a building according to claim 1, wherein: an embedded part is arranged at the contact position of the vertical drainage pipe (1) and the bottom plate (3), and two ends of the embedded part are respectively communicated with the two vertical drainage pipes (1).

6. The secondary waterproof and drainage structure in a building according to claim 5, wherein: the embedded part comprises a first connecting pipe (50) which is arranged at the contact position of the bottom plate (3) and the drainage vertical pipe (1) and is positioned at one side close to the backfill layer (4), a second connecting pipe (51) which is arranged at the contact position of the bottom plate (3) and the drainage vertical pipe (1) and is positioned at one side far away from the backfill layer (4), and a connecting part (52) which is arranged between the first connecting pipe (50) and the second connecting pipe (51), wherein the outer side walls of the first connecting pipe (50), the second connecting pipe (51) and the connecting part (52) are all in butt joint with the bottom plate (3).

7. The secondary waterproof and drainage structure in a building of claim 6, wherein: connecting portion (52) include first holding ring (520), second holding ring (521) and butt ring (522), the lateral wall of first holding ring (520) is connected and first holding ring (520) is close to in one side of second connecting pipe (51) extends to second connecting pipe (51) with the second connecting pipe (51), second holding ring (521) set up in one side that second connecting pipe (51) were kept away from in first holding ring (520), second holding ring (521) are the horn mouth form setting and are close to the diameter of second connecting pipe (51) one side and be less than the diameter of keeping away from second connecting pipe (51) one side, butt ring (522) set up in one side that first holding ring (520) are kept away from in second holding ring (521) and are connected with first connecting pipe (50).

8. The secondary waterproof and drainage structure in a building according to claim 1, wherein: an inclined plane (30) is arranged on one side of the bottom plate (3) close to the backfill layer (4), and the joint of the bottom plate (3) and the vertical drainage pipe (1) is the lowest point of the inclined plane (30).

9. The secondary waterproof and drainage structure in a building according to claim 4, wherein: the drainage stand pipe (1) is provided with a yielding groove (13) corresponding to the position of the positioning sleeve (10), and the positioning sleeve (10) is integrally positioned in the yielding groove (13).

10. A construction method of a secondary waterproof and drainage structure in a building for installing the secondary waterproof and drainage structure in a building according to any one of claims 1 to 9, characterized in that: the method comprises the following steps:

s1: pre-embedding an embedded part into a bottom plate, and installing drainage vertical pipes (1) at two ends of the embedded part;

s2: covering the first filter screen (21) at an opening of one end of the draft tube (2) far away from the vertical drainage tube (1), then installing the installation ring (20) at one end of the draft tube (2) far away from the vertical drainage tube (1), and fixing the first filter screen (21) through the installation ring (20);

s3: stacking the filter filler (12) on the peripheral side of the vertical drainage pipe (1), and enabling the filter filler (12) to sink through the opening of the draft tube (2);

s4: the positioning sleeve (10) is arranged in the abdicating groove (13), then the second filter screen (11) is covered on the peripheral side of the filter filling material (12), and then the backfill layer (4) is filled with sandstone;

s5: and pouring a concrete layer (5) to finish the installation of the secondary waterproof and drainage structure in the building.

Technical Field

The invention relates to the field of waterproof construction of toilets, in particular to a secondary waterproof and drainage structure in a building and a construction method thereof.

Background

The toilet is a space for residents to perform activities such as defecation, bathing, washing and the like, wherein the waterproof and drainage construction of the toilet is the key point of the construction quality control in the building, so that more drainage pipes are required to be laid on the wall surface and the floor of the toilet in order to meet the water supply and drainage requirements of the toilet.

At present, in the construction of some commercial buildings, in order to reduce the problem that when a horizontal drainage pipeline is laid on the floor of a toilet, the horizontal drainage pipeline passes through the floor and enters the indoor space of a lower-layer resident, a sunken toilet is needed. When the existing sinking type toilet is constructed, a bottom plate of the toilet needs to be partially or wholly sunk to a certain height away from a corresponding floor, then a horizontal drainage pipeline and a drainage vertical pipe of the toilet are embedded into the bottom plate, then gravel or light materials are used for backfilling to form a backfill layer, finally a concrete layer is laid above the backfill layer, and a hole is formed in the concrete layer for the drainage vertical pipe to penetrate out.

In view of the above-mentioned related technologies, the inventor believes that the gravel or lightweight material in the backfill layer will gradually sink after a long time, which easily causes cracks at the contact position between the upper concrete layer and the vertical drainage pipe, thus leading to the difficulty in draining water in the toilet when the water permeates into the backfill layer, and as the time is prolonged, the accumulated water in the backfill layer will gradually smell, which affects the daily life of residents.

Disclosure of Invention

In order to effectively reduce the accumulation of moisture in a backfill layer, the application provides a secondary waterproof and drainage structure in a building and a construction method thereof.

In a first aspect, the application provides a secondary water-proof and drainage structure in a building and a construction method thereof, and the following technical scheme is adopted:

the utility model provides a drainage structures is prevented to secondary in building, includes drainage riser and honeycomb duct, the drainage riser runs through to set up on the bottom plate and runs through backfill layer and concrete layer from bottom to top in proper order, the honeycomb duct sets up in the lateral wall of drainage riser and wholly lies in the backfill layer, the one end and the drainage riser of honeycomb duct are linked together, the other end is linked together with the backfill layer, the one end of honeycomb duct is provided with first filtering component.

Through adopting the above technical scheme, the honeycomb duct that sets up, can make the water that permeates into the backfill layer flow in the drainage riser from the honeycomb duct department, thereby can reduce moisture effectively and excessively gather backfilling the intraformational water, in addition, through setting up first filtering component, can utilize first filtering component to come to carry out better filtration to backfilling intraformational debris and grit, be favorable to reducing debris and grit and be taken into honeycomb duct and drainage riser two and cause intraductal jam, and then can promote secondary drainage structures's stability to a certain extent, secondary drainage structures's life has been prolonged.

Preferably, the first filtering component comprises a mounting ring sleeved on one end of the draft tube far away from the vertical drainage tube and a first filter screen arranged on one side of the mounting ring and positioned at an opening of one end of the draft tube far away from the vertical drainage tube.

Through adopting above-mentioned technical scheme, the first filter screen of setting can be favorable to reducing in impurity and grit in moisture will the backfill layer bring the honeycomb duct into, reduces the condition that the honeycomb duct blockked up and the collar that sets up can improve the installation stability of first filter screen effectively.

Preferably, a second filtering assembly is arranged on the peripheral side of the drainage vertical pipe, and the second filtering assembly is integrally positioned on the side wall of the drainage vertical pipe close to the guide pipe.

Through adopting above-mentioned technical scheme, the second filtering component that sets up can reduce effectively that moisture will backfill intraformational impurity and grit and bring into honeycomb duct and drainage riser to be favorable to reducing the condition that the drainage riser blockked up.

Preferably, the second filtering component comprises a positioning sleeve arranged on the periphery of the drainage vertical pipe, a second filtering net which is annularly arranged on the positioning sleeve and is integrally positioned on the periphery of the drainage vertical pipe, and filtering filler arranged between the second filtering net and the drainage vertical pipe.

By adopting the technical scheme, the second filter screen and the filter filling material are arranged, so that water in the backfill layer can flow into the flow guide pipe after being filtered twice by the second filter screen and the filter filling material, the aim of reducing impurities entering the flow guide pipe is achieved, the installation stability of the second filter screen can be improved to a certain extent by arranging the positioning sleeve, and the situation of deviation of the position of the second filter screen is reduced.

Preferably, an embedded part is arranged at the contact position of the vertical drainage pipe and the bottom plate, and two ends of the embedded part are respectively communicated with the two vertical drainage pipes.

By adopting the technical scheme, the arranged embedded part can be used for connecting the two drainage vertical pipes with the two sides of the embedded part respectively when the drainage vertical pipes are installed, so that gaps between the bottom plate and the drainage vertical pipes can be effectively reduced, the situation that water in a toilet permeates into different floors from the gaps between the bottom plate and the drainage vertical pipes can be reduced to a certain extent, the situation of mutual water seepage between different floors is reduced, and the increase of water in a backfill layer is further reduced.

Preferably, the embedded part comprises a first connecting pipe arranged at the contact position of the bottom plate and the drainage vertical pipe and positioned on one side close to the backfill layer, a second connecting pipe arranged at the contact position of the bottom plate and the drainage vertical pipe and positioned on one side far away from the backfill layer, and a connecting part arranged between the first connecting pipe and the second connecting pipe, wherein the outer side walls of the first connecting pipe, the second connecting pipe and the connecting part are all abutted to the bottom plate.

Through adopting above-mentioned technical scheme, the first connecting pipe and the second connecting pipe that set up, the workman can be when the installation, be connected with the drainage riser that is located backfill layer through first connecting pipe, can also be connected with another drainage riser that is located the bottom plate and keeps away from backfill layer one side through the second connecting pipe simultaneously, and the connecting portion that sets up can improve the smooth and easy degree of flow of water, reduces the condition that moisture oozes from the built-in fitting effectively.

Preferably, connecting portion include first holding ring, second holding ring and butt ring, the lateral wall of first holding ring is connected with the second connecting pipe and first holding ring extends to in the second connecting pipe near the one side of second connecting pipe, the second holding ring sets up the one side of keeping away from the second connecting pipe at first holding ring, the second holding ring is the horn mouth form set up and is close to the diameter that second connecting pipe one side is less than the diameter of keeping away from second connecting pipe one side, the butt ring sets up the one side of keeping away from first holding ring at the second holding ring and is connected with first connecting pipe.

Through adopting above-mentioned technical scheme, set up first holding ring and butt ring, can promote the sealing performance of being connected of built-in fitting and two drainage riser effectively, and through setting up the second holding ring into the horn mouth form, can make the rivers in the drainage riser more smoothly to can reduce the condition emergence that moisture oozed from the built-in fitting is inside to a certain extent.

Preferably, one side of the bottom plate, which is close to the backfill layer, is provided with an inclined plane, and the joint of the bottom plate and the vertical drainage pipe is the lowest point of the inclined plane.

Through adopting above-mentioned technical scheme, the inclined plane of setting can make the water that is located backfill layer bottom flow to the honeycomb duct department of the minimum department of inclined plane fast to can improve the derivation efficiency of moisture to a certain extent, reduce the accumulation of moisture in backfill layer more effectively.

Preferably, the drainage stand pipe is provided with a yielding groove corresponding to the position of the positioning sleeve, and the positioning sleeve is integrally positioned in the yielding groove.

Through adopting above-mentioned technical scheme, the groove of stepping down that sets up can wholly carry on spacingly to the position sleeve to can promote the stability of second filtering component when using better.

In a second aspect, the application provides a construction method of a secondary waterproof and drainage structure in a building, which adopts the following technical scheme:

s1: pre-embedding an embedded part into a bottom plate, and installing drainage vertical pipes at two ends of the embedded part;

s2: the first filter screen is covered at an opening of one end of the flow guide pipe, which is far away from the vertical drainage pipe, then the mounting ring is mounted at one end of the flow guide pipe, which is far away from the vertical drainage pipe, and the first filter screen is fixed through the mounting ring;

s3: stacking the filter filling material on the peripheral side of the drainage vertical pipe, and enabling the filter filling material to submerge the opening of the flow guide pipe;

s4: installing the positioning sleeve in the abdicating groove, then covering the second filter screen on the peripheral side of the filter filling material, and filling the backfill layer with sandstone;

s5: and pouring a concrete layer to finish the installation of the secondary waterproof and drainage structure in the building.

Through adopting above-mentioned technical scheme, can make the installation stability of first filtering component, second filtering component and built-in fitting obtain promoting effectively to can prolong the life of secondary drainage structures better.

In summary, the present application includes at least one of the following beneficial technical effects:

1. in addition, through the arrangement of the first filtering component, sundries and gravels in the backfill layer can be better filtered by utilizing the first filtering component, so that the blockage in the pipe caused by the fact that the sundries and the gravels are carried into the guide pipe and the drainage vertical pipe by water can be reduced, the stability of the secondary water-proof and drainage structure can be improved to a certain extent, and the service life of the secondary water-proof and drainage structure is prolonged;

2. the arrangement of the second filter screen and the filter filling material can enable the water in the backfill layer to flow into the guide pipe after being filtered by the second filter screen and the filter filling material for two times so as to achieve the purpose of reducing impurities entering the guide pipe, and the arrangement of the positioning sleeve can improve the installation stability of the second filter screen to a certain extent and reduce the situation that the position of the second filter screen deviates;

3. by arranging the embedded part, the two vertical drainage pipes can be respectively connected with the two sides of the embedded part when the vertical drainage pipes are installed, so that gaps between the base plate and the vertical drainage pipes can be effectively reduced, the condition that water in a toilet permeates into a backfill layer from the gaps between the base plate and the vertical drainage pipes can be reduced to a certain extent, and the increase of the water in the backfill layer is further reduced;

4. through setting up the inclined plane, can make the water that is located backfill layer bottom flow to the honeycomb duct department of the minimum of inclined plane fast to can improve the derivation efficiency of moisture to a certain extent, reduce the moisture more effectively and in the intraformational accumulation of backfill.

Drawings

Fig. 1 is a sectional view of the entire structure of a secondary waterproof structure in a building according to an embodiment of the present application;

FIG. 2 is an enlarged view of portion A of FIG. 1;

fig. 3 is a sectional view of a partial structure of a secondary waterproof structure in a building according to an embodiment of the present application;

fig. 4 is a schematic structural diagram of the whole of the secondary waterproof and drainage structure in the building according to the embodiment of the present application.

Description of reference numerals:

1. a vertical drainage pipe; 10. a positioning sleeve; 11. a second filter screen; 12. filtering the filling material; 13. a yielding groove; 2. a flow guide pipe; 20. a mounting ring; 21. a first filter screen; 3. a base plate; 30. a bevel; 4. a backfill layer; 5. a concrete layer; 50. a first connecting pipe; 51. a second connecting pipe; 510. an annular strip; 511. a convex ring; 52. a connecting portion; 520. a first positioning ring; 521. a second positioning ring; 522. an abutment ring.

Detailed Description

The present application is described in further detail below with reference to figures 1-4.

The embodiment of the application discloses drainage structures is prevented to secondary in building, refer to fig. 1 and 2, drainage structures is prevented to secondary includes drainage riser 1 and honeycomb duct 2, and simultaneously, bottom plate 3, backward flow layer and concrete layer 5 have set gradually from bottom to top in the bathroom, wherein, drainage riser 1 runs through the setting on bottom plate 3, honeycomb duct 2 installs the one side at drainage riser 1, honeycomb duct 2's both ends are the setting of running through, and honeycomb duct 2 is close to drainage riser 1's one end and is linked together with drainage riser 1.

When the water content in the backfill layer 4 is high, the water content can flow to the draft tube 2, flow from the draft tube 2 to the vertical drainage tube 1, and then be discharged along the vertical drainage tube 1, so as to reduce the accumulation of the water content in the backfill layer 4.

Referring to fig. 2 and 3, in order to allow moisture in the reflux layer to flow to the draft tube 2 more quickly, a slope 30 is attached to the bottom plate 3 on the side close to the reflux layer, and the draft tube 2 is located on the lower side of the slope 30 as a whole.

Referring to fig. 1 and 2, in order to reduce the impurities in the backfill layer 4 from entering the draft tube 2, a first filter assembly is disposed at one end of the draft tube 2 away from the vertical drainage tube 1, and in this embodiment, the first filter assembly includes a mounting ring 20 and a first filter screen 21, wherein the mounting ring 20 is mounted on the periphery of the draft tube 2, the first filter screen 21 is mounted at the opening of one end of the draft tube 2 away from the vertical drainage tube 1, and the first filter screen 21 covers the end of the draft tube 2 as a whole. Meanwhile, the edge of the first filter 21 abuts against the inner side wall of the mounting ring 20, and in this embodiment, the first filter 21 may be a dense mesh.

During installation, a worker firstly covers the dense mesh net on the end part of the guide pipe 2, the edge of the dense mesh net is attached to the side wall of the end part of the guide pipe 2, then the mounting ring 20 is matched with the dense mesh net in a sliding and inserting mode along the extending direction of the guide pipe 2, the inner wall of the mounting ring 20 is attached to the dense mesh net, the purpose of fixing the dense mesh net is achieved through the mounting ring 20, and therefore the first filter screen 21 can filter gravels in the backfill layer 4 stably.

Referring to fig. 2 and 3, in order to further reduce the clogging of the draft tube 2, a second filter module is provided on the peripheral side of the vertical drain tube 1, and the entire second filter module is located at a position of the vertical drain tube 1 close to the draft tube 2.

In this embodiment, the second filtering component includes a positioning sleeve 10 and a second filter screen 11, wherein, a slot 13 of stepping down is annularly arranged on the side wall of the vertical drainage pipe 1, and the slot 13 of stepping down is wholly located above the flow guiding pipe 2, and simultaneously, the positioning sleeve 10 is wholly located in the slot 13 of stepping down, the second filter screen 11 is wholly arranged in a horn mouth shape, and one side of the second filter screen 11 is connected with the positioning sleeve 10, and the other side is connected with the bottom plate 3.

In addition, the diameter of the second filter 11 near the bottom plate 3 is larger than the diameter of the second filter 11 near the positioning sleeve 10, and in this embodiment, a stainless steel metal filter is used as the second filter 11 in order to improve the rigidity and the waterproof property of the second filter 11.

Referring to fig. 2 and 3, a filter filler 12 is disposed between the second filter screen 11 and the vertical drainage pipe 1, and the filter filler 12 entirely fills the area between the second filter screen 11 and the vertical drainage pipe 1, wherein, in the present embodiment, the filter filler 12 may be selected from stones with a diameter of 2-3 cm.

Referring to fig. 1 and 2, in order to effectively reduce the seepage of water from the backfill layer 4 at the connection between the drainage riser 1 and the bottom plate 3, an embedded part is installed at the position of the bottom plate 3 corresponding to the drainage riser 1, in the present embodiment, the embedded part includes a first connecting pipe 50, a second connecting pipe 51 and a connecting part 52, wherein the first connecting pipe 50 is entirely located at the connection between the bottom plate 3 and the drainage riser 1 and on the side close to the backfill layer 4, the second connecting pipe 51 is entirely located at the connection between the bottom plate 3 and the drainage riser 1 and on the side far from the backfill layer 4, and the connecting part 52 is entirely installed between the first connecting pipe 50 and the second connecting pipe 51.

In addition, referring to fig. 2, the outer side walls of the first connecting pipe 50, the second connecting pipe 51 and the connecting portion 52 are all abutted against the bottom plate 3, meanwhile, the second connecting pipe 51 is connected with the vertical drainage pipe 1 located on the side of the bottom plate 3 far away from the backfill layer 4, the first connecting pipe 50 is connected with another vertical drainage pipe 1 located on the side of the bottom plate 3 close to the backfill layer 4, and the two vertical drainage pipes 1 are communicated through an embedded part.

In addition, in order to further improve the embedding stability of the second connecting pipe 51, a convex ring 511 is installed on the outer side wall of the second connecting pipe 51 far from the connecting portion 52, the convex ring 511 extends in the direction far from the outer side wall of the second connecting pipe 51, and the convex ring 511 is integrally embedded in the bottom plate 3.

Referring to fig. 2, in the present embodiment, the connecting portion 52 includes a first positioning ring 520, a second positioning ring 521 and an abutting ring 522, wherein, the inner side wall of the second connecting pipe 51 close to the backfill layer 4 is provided with a ring-shaped strip 510, the ring-shaped strip 510 extends towards the direction far away from the inner side wall of the second connecting pipe 51, and the outer side wall of the first positioning ring 520 abuts against the side of the annular strip 510 away from the inner side wall of the second connecting pipe 51, meanwhile, the second positioning ring 521 is installed on one side of the first positioning ring 520 close to the backfill layer 4, the second positioning ring 521 is in a bell mouth shape as a whole, and the diameter of the side of the second retaining ring 521 remote from the first retaining ring 520 is greater than the diameter of the side of the second retaining ring 521 adjacent to the first retaining ring 520, in addition, the abutting ring 522 is integrally installed on the outer side wall of the second positioning ring 521 on the side far from the first positioning ring 520, and the abutting ring 522 extends in the direction far from the outer side wall of the second positioning ring 521.

The embodiment of the application also discloses a construction method of the secondary water-proof and drainage structure in the building, which comprises the following steps:

s1: installing an embedded part in a base plate 3 in advance according to construction requirements, and enabling a first connecting pipe 50 to be installed on one side, close to a backfill layer 4, of the base plate 3, and a second connecting pipe 51 to be installed on one side, far away from the backfill layer 4, of the base plate 3, wherein the peripheral side of the embedded part is abutted against the base plate 3, and the thickness of the base plate 3 is consistent with the height of the embedded part;

s2: connecting the drainage vertical pipe 1 on the side of the bottom plate 3 close to the backfill layer 4 with a first connecting pipe 50 through PVC glue, and connecting the drainage vertical pipe 1 on the side of the bottom plate 3 far away from the backfill layer 4 with a second connecting pipe 51 through PVC glue;

s3: covering a first filter screen 21 at an opening of one end of the draft tube 2 far away from the drainage stand tube 1, then inserting a mounting ring 20 into one end of the draft tube 2 far away from the drainage stand tube 1 in a sliding manner along the extension direction of the draft tube 2, and clamping and positioning the first filter screen 21 through the mounting ring 20;

s4: installing a positioning sleeve 10 into a yielding groove 13 on the side wall of the drainage vertical pipe 1, then abutting and fixing one side of a second filter screen 11 with the positioning sleeve 10, and abutting and fixing the other side of the second filter screen with the bottom plate 3, so that the second filter screen 11 is integrally placed in a horn mouth shape;

s5: stacking filter filler 12 in the area between the vertical drainage pipe 1 and the second filter screen 11, and filling the whole area with the filter filler 12 so that the whole flow guide pipe 2 is covered by the filter filler 12;

s6: backfilling the sandstone into the backfill layer 4, and filling the whole backfill layer 4 with the sandstone;

s7: and (3) arranging reinforcing steel bars on the backfill layer 4, pouring concrete at the reinforcing steel bars to enable the concrete to cover the surface of the gravel of the backfill layer 4, and forming a concrete layer 5 after the concrete is condensed to finish the installation and construction of the secondary waterproof and drainage structure in the building.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.