CN214061631U

CN214061631U - Layered grouting device

Info

Publication number: CN214061631U
Application number: CN202023011366.9U
Authority: CN
Inventors: 吕成炜; 刘贵强; 王春; 张龙飞; 吕晓光; 高小平; 陈翀
Original assignee: Anhui Urban Construction Foundation Engineering Co ltd
Current assignee: Anhui Urban Construction Foundation Engineering Co ltd
Priority date: 2020-12-15
Filing date: 2020-12-15
Publication date: 2021-08-27
Anticipated expiration: 2030-12-15

Abstract

The utility model discloses a layered grouting device, which relates to a grouting pipe, comprising a grouting pipe, the side wall of the grouting pipe is provided with a plurality of grout outlet holes, the grouting pipe is internally provided with a grout supply pipe, the bottom outer wall of the grout supply pipe is sleeved with two cylindrical grout stopping plugs fixedly connected with the grout supply pipe from top to bottom, a grout outlet space is arranged between the two grout stopping plugs, the grout supply pipe is provided with a grout supply hole on the pipe body in the grout outlet space, each grout stopping plug is composed of an external shell and an internal elastic sealing cavity, the side wall of the external shell is uniformly provided with a plurality of annular gaps from top to bottom, the outer wall of the internal elastic sealing cavity is attached to the inner wall of the external shell, the two internal elastic sealing cavities are connected through a connecting pipe, and the internal elastic sealing cavity above the external elastic sealing cavity is also connected with an external pressure supply device through an air supply pipe; the utility model discloses can effectively realize the purpose of layering slip casting, and can set for the slip casting order in a flexible way, avoid the defect of traditional layering slip casting.

Description

Layered grouting device

Technical Field

The utility model relates to a slip casting pipe specifically is an equipment for layering slip casting.

Background

The grouting pipe is a common device in infrastructure construction, and grouting is carried out in the pipe by arranging a grouting hole on the pipe and an external grouting supply device, however, the grouting effect is not ideal in the traditional grouting mode, as the pipes are all straight, the grout can automatically flow to the grouting hole with high porosity of the surrounding soil body, and the grouting amount of other parts needing to be filled can not meet the requirements, so that the grouting effect is directly influenced, and the grouting cost is increased;

the technical scheme of partial layered grouting in the prior art adopts regional or sectional grouting, which only can realize bottom-to-top grouting, has poor flexibility and poor sealing effect, has overflow phenomenon and is not beneficial to saving grouting cost.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art not enough, provide a layering slip casting device to solve the poor technical problem of layering slip casting effect in the prior art.

The utility model discloses a realize through following technical scheme:

a layered grouting device comprises a grouting pipe, a plurality of grout outlet holes are arranged on the side wall of the grouting pipe from top to bottom, a slurry supply pipe with the top end connected with an external grouting device and the bottom end closed is arranged in the grouting pipe, two cylindrical slurry stop plugs fixedly connected with the slurry supply pipe are sleeved on the outer wall of the bottom end of the slurry supply pipe from top to bottom, the outer diameter of the grout stop plugs is smaller than the inner diameter of the grouting pipe, a grout outlet space is arranged between the two grout stop plugs, the tube body of the slurry supply tube in the slurry outlet space is provided with slurry supply holes, each slurry stop plug consists of an outer shell and an inner elastic sealing cavity, a plurality of annular gaps are uniformly arranged on the side wall of the outer shell in the vertical direction from top to bottom, the outer wall of the inner elastic sealing cavity is attached to the inner wall of the outer shell, the two inner elastic sealing cavities are connected through a connecting pipe, and the inner elastic sealing cavity above the inner elastic sealing cavity is also connected with an outer pressure supply device through an air supply pipe.

Furthermore, an oil supply pipe connected with an external oil supply device is further arranged in the grouting pipe, the bottom end of the oil supply pipe penetrates through the grout stopping plug above and then is fixedly connected with the top of the grout stopping plug below, a first oil outlet is formed in the oil supply pipe above the grout stopping plug above the top, and a second oil outlet is formed in the oil supply pipe between the two grout stopping plugs.

Furthermore, the outer wall of the grouting pipe where each slurry outlet hole is located is also respectively connected with an annular slurry outlet pipe which wraps the grouting pipe in a self-generating manner, and the annular slurry outlet pipe is uniformly provided with slurry overflow holes.

Further, the outer shell body is composed of an upper cover, a plurality of middle supporting layers and a lower cover which are coaxially distributed, the upper cover, the middle supporting layers and the lower cover are sleeved on the pulp supply pipe and are in threaded connection with the outer wall of the pulp supply pipe, the upper cover is composed of a first transverse circular plate and a first annular vertical enclosing plate which is integrated with the first transverse circular plate and is arranged at the bottom of the outer edge of the first transverse circular plate, the middle supporting layer is composed of a cylindrical cavity and a second annular vertical enclosing plate which is arranged at the outer edge of the top end and the outer edge of the bottom end of the cylindrical cavity, the lower cover is composed of a second transverse circular plate and a third annular vertical enclosing plate which is integrated with the second transverse circular plate and is arranged at the top of the outer edge of the second transverse circular plate, the inner diameter and the outer diameter of all the annular vertical enclosing plates are the same, the inner elastic sealing cavity is composed of a plurality of cylindrical elastic sealing cavities which are sleeved on the pulp supply pipe and have the same outer diameter as the inner diameter of the first annular vertical enclosing plate, between upper cover and the adjacent middle part supporting layer, be provided with a cylindrical elastic seal cavity respectively between two adjacent middle part supporting layers and between lower cover and the adjacent middle part supporting layer, the distance between upper cover bottom and the adjacent middle part supporting layer top, distance between the adjacent middle part supporting layer and the distance between lower cover top and the adjacent middle part supporting layer bottom are the same with cylindrical elastic seal cavity's thickness, connect through the high-pressure line between two adjacent cylindrical elastic seal cavities in same only thick liquid stopper, lead to the connecting pipe between two adjacent cylindrical elastic seal cavities in two only thick liquid stoppers and connect, and the cylindrical elastic seal cavity that is in the top is connected with the external air supply pipe.

Further, the first transverse circular plate is replaced by an arc-shaped plate protruding upwards.

Furthermore, the exposed edge part of each annular enclosing plate is in a circular arc shape.

Furthermore, each grout outlet hole corresponds to the outer wall of the grouting pipe, and a one-way check device arranged in the corresponding annular grout outlet pipe is arranged on the outer wall of the grouting pipe.

Furthermore, a connecting pipe is eliminated, a pressure valve is fixedly mounted on each high-pressure pipe, the pressure required by the expansion of the cylindrical elastic sealing cavity to the contact of the inner wall of the grouting pipe is smaller than the pressure required by the opening of the pressure valve, two branch pipes are arranged at the bottom of the external air supply pipe, and each branch pipe is connected with the cylindrical elastic sealing cavity at the bottommost part of the grout stop plug.

Furthermore, the grouting pipe and the annular grouting pipe are both fixedly installed in the reinforcement cage.

Compared with the prior art, the utility model has the following advantages:

1. the utility model adopts two grout stopping plugs to plug the upper and lower sides of the grout outlet, so that the grout can only flow out from the designated grout outlet, thereby effectively realizing the purpose of fixed-point layered grouting and having stronger flexibility;

2. the utility model discloses a set up the grout stopping stopper to the combination of outside casing and inside elastic seal cavity, make the grout stopping stopper form the multilayer seal when sealed, improved sealed effect effectively;

3. the utility model can effectively avoid the influence of the consolidation slurry on the sealing effect by arranging the oil seal system, thereby forming an oil seal layer and improving the sealing effect;

4. the utility model discloses a set up fluid feed system, realized the effective protection to cylindrical elastic seal cavity, improved the life of equipment.

Drawings

FIG. 1 is a schematic diagram illustrating an operating state of an apparatus according to a first embodiment;

FIG. 2 is a cross-sectional top view of the joint of an injection pipe and an annular outlet pipe in the first embodiment;

FIG. 3 is a cross-sectional view of the two grout stops of the first embodiment with the internal elastomeric seal cavity unexpanded;

FIG. 4 is a sectional view of the two grout stops of the first embodiment in an expanded state of the internal elastic sealing cavity;

FIG. 5 is a sectional view showing the expansion state of the internal elastic sealing cavity when two grout stopping plugs are operated according to the second embodiment;

FIG. 6 is a sectional view showing the expansion state of the internal elastic sealing cavity when two grout stopping plugs in the third embodiment are in operation.

In the figure: 1. a grouting pipe; 2. a slurry outlet; 3. a slurry supply pipe; 4. a grout stopping plug; 5. a slurry supply hole; 6. an outer housing; 7. an internal elastic sealed cavity; 8. an annular gap; 9. a connecting pipe; 10. a gas supply pipe; 11. an oil supply pipe; 12. a first oil outlet hole; 13. a second oil outlet hole; 14. an annular slurry outlet pipe; 15. a slurry overflow hole; 16. an upper cover; 17. a middle support layer; 18. a lower cover; 19. A first transverse circular plate; 20. a first annular vertical shroud; 21. a cylindrical cavity; 22. a second annular vertical shroud; 23. a second transverse circular plate; 24. a third annular vertical shroud; 25. a cylindrical elastic seal cavity; 26. a high pressure pipe; 27. a one-way check device; 28. a pressure valve; 29. a support frame; 30. and (5) dividing the pipes.

Detailed Description

The technical solution of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it should be understood that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

An embodiment of the present invention is described below:

example 1

With reference to fig. 1-4, the embodiment provides a layered grouting apparatus, including a grouting pipe 1, similar to a conventional grouting pipe 1, in order to perform grouting at different heights, a plurality of grout outlet holes 2 are formed in a side wall of the grouting pipe 1 from top to bottom, each grout outlet hole 2 is located at a position on the grouting pipe 1, and is the same as a position to be grouted, so as to avoid a defect that when grouting is performed on the grouting pipe 1 at the same time, grout flows out through each grout outlet hole 2, so that a part of positions cannot achieve a grouting effect, and a requirement that grouting can be performed separately for one grout outlet hole 2 and grouting is not performed in the other grout outlet holes 2 is required to be satisfied;

in order to meet the above requirement, in the present embodiment, a slurry supply pipe 3 with an outer diameter smaller than the inner diameter of the slurry supply pipe 1 is firstly arranged in the slurry supply pipe 1, the slurry supply pipe 1 is not used as a pipeline for slurry to flow in, two cylindrical slurry stop plugs 4 are fixedly arranged at the bottom end of the slurry supply pipe 3, and the outer diameter of the slurry supply pipe is smaller than the inner diameter of the slurry supply pipe 1, so that the slurry supply pipe 3 can move up and down in the slurry supply pipe 1 along with the slurry supply pipe 3, the slurry stop plugs 4 are arranged to block the slurry supply pipe 1 at the upper side and the lower side of the slurry outlet 2 when slurry is injected into one slurry outlet 2, so that the slurry can only flow out from the slurry outlet 2, therefore, the two slurry stop plugs 4 are not contacted with each other, a slurry outlet space is formed between the two slurry stop plugs, a slurry supply hole 5 is arranged on the portion of the slurry supply pipe 3 between the two slurry supply pipes, the bottom end of the slurry supply pipe 3 is closed, and the outer diameter of the slurry stop plugs 4 is smaller than the inner diameter of the slurry supply pipe 1, so there is a gap between them, the slurry may be exposed from the gap and can not enter the designated slurry outlet 2, therefore, in this embodiment, the slurry stop plug 4 is configured to be composed of a cylindrical outer casing 6 and an inner elastic sealing cavity 7, wherein the outer casing 6 is made of hard material such as steel material, which forms a supporting and protecting function, and a plurality of annular gaps 8 are uniformly opened on the vertical annular sidewall from top to bottom, a vertical direction surrounding plate formed by the plurality of annular gaps 8 is connected with the top and bottom or the slurry supply pipe 3 to form a stable structure, in this embodiment, because the top and bottom of the outer casing 6 are respectively fixedly connected with the slurry supply pipe 3, and the vertical direction surrounding plate formed by the plurality of annular gaps 8 in the middle is fixedly connected with the slurry supply pipe 3 through a connecting rod, and at the same time, the inner elastic sealing cavity 7 is disposed in the inner cavity of the outer casing 6, the grouting pipe is made of elastic materials such as rubber and the like, can effectively stretch and retract, has the same shape as the inner cavity of the outer shell 6, can be effectively accommodated in the outer shell 6, expands when high-pressure gas is injected into the grouting pipe, is limited by the structure of the outer shell 6, the expanded part of the grouting pipe can only expand outwards through the annular gap 8, and further can effectively generate extrusion contact with the inner wall of the grouting pipe 1, because the grouting pipe is positioned between the top end and the bottom end of the outer shell 6, the grouting pipe can be filled with the outer side of the corresponding annular gap 8 and then expand towards two sides, after the inner part reaches corresponding pressure, on one hand, the relative position between the grout stopping plug 4 and the grouting pipe 1 can be effectively fixed, on the other hand, the gap between the grout stopping plug and the grouting pipe can be effectively sealed, effective sealing is realized, in particular, in order to realize synchronous expansion of two inner elastic sealing cavities 7 in, the two inner elastic sealing cavities 7 are connected through a connecting pipe 9, and the inner elastic sealing cavity 7 positioned above the inner elastic sealing cavity is connected with an external pressure supply device through an air supply pipe 10, so that the purpose of synchronous injection and pressure of the two cavities is realized.

The working principle of the equipment is as follows:

after the equipment is assembled, the whole body formed by the grout outlet pipe and the two grout stop plugs 4 is put down from the top of the grouting pipe 1 to the inside of the grouting pipe, the inner elastic sealing cavity 7 does not expand in the process, therefore, the grouting pipe can smoothly go down, when the position of the grout supply hole 5 on the grout supply pipe 3 is in the same horizontal position with the grout outlet hole 2 to be grouted, namely, the grout outlet hole 2 is in a grout outlet space, an external pressure supply device, namely an air pump and the like supply high-pressure gas to the two inner elastic sealing cavities 7 through an air supply pipe 10, then the two inner elastic sealing cavities 7 expand under pressure, the grouting pipe can only overflow and expand through the annular gap 8 under the limitation of an external shell 6 until the grouting pipe 1 is tightly attached, the air injection is stopped, the position of the grout stop plugs 4 is fixed, the upper side and the lower side of the grout outlet hole 2 are sealed, then the external grouting device supplies grout and flows into a designated position through the grout supply pipe 3, the grout supply hole 5, the grout outlet space and the grout outlet hole 2, the purpose of specified grouting is realized;

when grouting is needed to be performed on the next grout outlet 2, the two internal elastic sealing cavities 7 are decompressed, then the grout supply pipe 3 is pulled out to a specified position, and the operations are repeated, so that the purpose of layered grouting is achieved.

In particular, considering that the inner elastic sealed cavity 7 can not be contacted with the slurry in the process of expansion and contraction, thick slurry particles can be attached to the outer wall of the inner elastic sealed cavity 7, partial solidified slurry can exist when the inner elastic sealed cavity is expanded again to influence the expansion and sealing effect of the inner elastic sealed cavity 7, partial solidified slurry can influence the effective contraction and destroy the smoothness of the outer wall of the inner elastic sealed cavity when the inner elastic sealed cavity is contracted, iron rust and the like can exist in the grouting pipe 1, and the sealing effect of the inner elastic sealed cavity 7 and the outer wall is also influenced when the inner elastic sealed cavity is expanded, in the embodiment, an oil sealing system is additionally arranged, specifically, an oil supply pipe 11 connected with an external oil supply device is arranged in the grouting pipe 1, the bottom end of the oil supply pipe 11 is connected with the top of the slurry stop plug 4 below through the slurry stop plug 4 above, the oil outlet holes, namely a first oil outlet hole 12 and a second oil outlet hole 13, are respectively arranged on the pipe body above the two slurry stop plugs 4, the inner diameter of the first oil outlet hole 12 is larger than that of the second oil outlet hole 13, the purpose is that the first oil outlet hole and the second oil outlet hole can synchronously supply oil, the specific using method is that when the internal elastic sealing cavity 7 is initially expanded or not expanded, oil is firstly supplied through the first oil outlet hole 12 and the second oil outlet hole 13 by an external oil supply device, the oil overflows into the external shell 6 or is in a structure with the internal elastic sealing cavity 7, then the internal elastic sealing cavity 7 is inflated and expanded by gas injection, the overflowed oil can be in contact with the part of the internal elastic sealing cavity 7 expanded out of the external shell 6 to soak the surface of the internal elastic sealing cavity, the oil supply can be stopped after the expansion is finished and the liquid supply continues for a period of time, and in the process, the oil can lubricate the, meanwhile, the inner wall of the grouting pipe 1 can be effectively infiltrated to avoid damage caused by rust, the oil liquid can be effectively prevented from damaging the internal elastic sealing cavity 7 by consolidation slurry and the like, gaps formed by the consolidation slurry adhered to the outer wall of the internal elastic sealing cavity 7 after the consolidation slurry expands can be effectively filled, and meanwhile, the infiltration of the oil liquid is convenient for eliminating the consolidation slurry in the expansion and contraction process of the internal elastic sealing cavity 7, so that the outer wall of the internal elastic sealing cavity can be effectively kept smooth, and the sealing is convenient.

In particular, because the grouting pipe 1 has multiple use ways, for example, it is used in a grouting pile, after the grouting pile is finished to form a pile body, it is necessary to perform grouting on its outer wall to fill its surrounding soil body and consolidate it to improve the soil body strength, therefore, the grouting pipe 1 is needed, and even if the grouting pipe 1 is used for grouting in layers, it is only able to discharge grout at a single point, which is not beneficial to grouting around the pile body, therefore, in this embodiment, the grouting pipe 1 portion where each grouting hole 2 is located is also connected with the annular grouting pipe 14 which wraps itself, the annular grouting pipe 14 is evenly provided with the grout overflow holes 15, through the above arrangement, the grouting around the pile body can be effectively performed to achieve the grouting purpose, and because the connection of the annular grouting pipe 14 and the grouting pipe 1 is at two ends, one grouting hole 2 can be provided at both ends, and the grouting speed is accelerated.

In particular, in order to facilitate the fixation of equipment and the like, when grouting is performed on the periphery of the cast-in-place pile, the grouting pipe 1 and the annular grout outlet pipe 14 are fixedly installed in a reinforcement cage of the cast-in-place pile.

In particular, in order to avoid the backflow of the slurry outside the slurry outlet 2 into the slurry injection pipe 1 after the completion of the slurry injection, in this embodiment, the outer wall of the slurry injection pipe 1 corresponding to each slurry outlet 2 is provided with a one-way non-return device 27 installed in the corresponding annular slurry outlet pipe 14, so that the slurry can only go out but not enter, and no slurry in the slurry injection pipe 1 can be effectively maintained.

Example 2

Referring to fig. 5, this embodiment provides a layered grouting apparatus, which has a similar structure to that of embodiment 1, and is mainly different from embodiment 1 in that a grout stop plug 4 is modified. In this embodiment, the outer casing 6 is specifically composed of an upper cover 16, a plurality of middle supporting layers 17 and a lower cover 18 which are coaxially distributed, and the three are all sleeved on the pulp supply pipe 3 and are in threaded connection with the outer wall of the pulp supply pipe, the upper cover 16 is specifically composed of a first transverse circular plate 19 and a first annular vertical enclosing plate 20 which is integrated with the first transverse circular plate 19 and is arranged at the bottom of the outer edge of the first transverse circular plate, the middle supporting layer 17 is specifically composed of a cylindrical cavity 21 and a second annular vertical enclosing plate 22 which is arranged at the outer edge of the top end and the outer edge of the bottom end of the cylindrical cavity 21, the lower cover 18 is specifically composed of a second transverse circular plate 23 and a third annular vertical enclosing plate 24 which is integrated with the second transverse circular plate 23 and is arranged at the top of the outer edge of the second transverse circular plate, the inner and outer diameters of all the annular vertical enclosing plates are the same, the inner and outer elastic sealing cavities 7 are specifically composed of a plurality of cylindrical elastic sealing cavities 25 which are sleeved on the pulp supply pipe 3 and have the same outer diameter as the inner diameter of the first annular vertical enclosing plate 20, between upper cover 16 and adjacent middle part supporting layer 17, be provided with a cylindrical elastic seal cavity 25 between two adjacent middle part supporting layers 17 and between lower cover 18 and adjacent middle part supporting layer 17 respectively, the distance between upper cover 16 bottom and adjacent middle part supporting layer 17 top, the distance between adjacent middle part supporting layer 17 and the distance between lower cover 18 top and adjacent middle part supporting layer 17 bottom are the same with cylindrical elastic seal cavity 25's thickness, connect through high-pressure pipe 26 between two adjacent cylindrical elastic seal cavity 25 in same thick liquid stopper 4, connect through connecting pipe 9 between two adjacent cylindrical elastic seal cavity 25 in two thick liquid stopper 4, and the cylindrical elastic seal cavity 25 that is in the top is connected with external air supply pipe 10.

Through the above setting, divide into upper cover 16 with outside casing 6, a plurality of middle part supporting layer 17 and lower cover 18, the structure of equipment has been simplified on the one hand, on the other hand the installation of the equipment of being convenient for, set up cylindrical elastic seal cavity 25 between upper and lower cover 18 and the middle part supporting layer 17 and between the adjacent middle part supporting layer 17, can be spacing effectively to it, multilayer sealed effect has been formed again simultaneously, high-pressure tube 26 and connecting pipe 9 can be effectively with all cylindrical elastic seal cavity 25 components of a whole air feed and pressure release.

In particular, in order to facilitate the oil overflow, in the present embodiment, the first circular cross plate 19 is replaced with an arc-shaped plate protruding upward, so that the oil can overflow rapidly under the action of gravity.

In particular, in order to avoid the damage of the outer edges of the annular enclosing plates to the cylindrical sealing cavity, in the embodiment, the exposed edge part of each annular enclosing plate is in a circular arc shape.

Example 3

With reference to fig. 6, the main difference between the apparatus structure in this embodiment and embodiment 2 is that, in order to effectively utilize the gap between the expansion exposed portions of adjacent cylindrical elastic sealing cavities 25, in this embodiment, oil is injected into the gap to improve the sealing effect, so that it is necessary to supply oil only after the cylindrical elastic sealing cavity 25 at the bottom of each grout stop 4 expands to contact with the inner wall of the grout pipe 1, in this embodiment, a pressure valve 28 is further fixedly installed on each high-pressure pipe 26, the pressure valve 28 is bidirectional, and the opening thereof only needs to meet the pressure requirement, for example, in this embodiment, the pressure valve 28 is specifically a rubber plug with a pressure relief hole at the middle portion, which is fixedly installed in the high-pressure pipe 26, and the pressure relief hole is in a state of being squeezed and closed by itself under the influence of its own elasticity under normal pressure, and when the internal positive pressure or negative pressure reaches the opening pressure, the pressure relief hole is opened to enable gas to flow into and out of the corresponding cylindrical elastic sealing cavity 25, meanwhile, in the embodiment, the pressure required when the cylindrical elastic sealing cavity 25 is expanded to be in contact with the inner wall of the grouting pipe 1 is smaller than the pressure required by opening the pressure valve 28, two branch pipes 29 are arranged at the bottom of the external air supply pipe 10, each branch pipe 29 is respectively connected with the cylindrical elastic sealing cavity 25 at the bottommost part of one grout stop plug 4, and meanwhile, the connecting pipe 9 is omitted.

Through the arrangement, before oil sealing, firstly, the cylindrical elastic sealing cavity 25 at the lowest part of the two grout stopping plugs 4 is expanded to be in contact with the inner wall of the grouting pipe 1, then oil supply is carried out, oil liquid overflows to the top of the first transverse circular plate 19 and then stops supplying oil, then gas is supplied to the cylindrical elastic sealing cavity 25 again, after the air pressure is larger than the opening pressure of the pressure valve 28, the cylindrical elastic sealing cavity 25 in each grout stopping plug 4 is sequentially expanded from bottom to top, an oil layer exists between every two adjacent cylindrical elastic sealing cavities 25, on one hand, the gap between the two cylindrical elastic sealing cavities can be effectively filled, the sealing effect is strengthened, on the other hand, the outer wall of the cylindrical sealing cavity can be effectively soaked, the grout adhesion effect can be kept clean and reduced, and meanwhile, the expansion.

In particular, in order to avoid the phenomenon that the cylindrical elastic sealing cavity 25 contracts into a mass due to the negative pressure when contracting, a supporting frame 29 is fixedly arranged on the end part of each high-pressure pipe 26 in the corresponding cylindrical elastic sealing cavity 25, the end part of each branch pipe 29 can also be connected with the supporting frame 29, so that when an external pressure supply device generates negative pressure, the supporting frame 29 can effectively support the cylindrical elastic sealing cavity 25 to avoid contracting into a mass, when the negative pressure is generated, the cylindrical elastic sealing cavity 25 in the same grout stop plug 4 contracts from bottom to top, and when the pressure in the cylindrical elastic sealing cavity 25 at the lower part is negative and the pressure difference with the cylindrical elastic sealing cavity 25 above the cylindrical elastic sealing cavity reaches the opening pressure of the corresponding pressure valve 28 and the pressure valve 28 is opened, the cylindrical elastic sealing cavity 25 on the cylindrical elastic sealing cavity starts to contract, and at the moment, the oil also flows from bottom to top, the outer wall of the cylindrical elastic sealing cavity 25 can be soaked and washed, and the degree of slurry attached to the outer wall of the cylindrical elastic sealing cavity 25 is reduced.

The one-way check device 27 in the embodiments 1 to 3 can be a one-way valve, and the connection mode can be that the slurry outlet hole 2 is communicated with the annular slurry outlet pipe 14 through the one-way check device.

The working principle is as follows:

the working method of the layered grouting device in the embodiment 3 specifically comprises the following steps:

step 1, after the whole layered grouting device in the embodiment 3 is put into a bored concrete pile hole, a conventional bored concrete pile is carried out to manufacture a pile body;

step 2, putting the whole body formed by the slurry supply pipe 3 and the two slurry stop plugs 4 into the slurry injection pipe 1 from the top end of the slurry injection pipe 1, stopping the lower part of the whole body until the slurry outlet hole 2 at the lowest part is positioned in the slurry outlet space, and fixing the top of the slurry supply pipe 3, wherein the sequence of grouting the slurry outlet holes 2 can be set according to needs and does not need to be from bottom to top;

step 3, inputting high-pressure airflow into the air supply pipe 10 by an external pressure supply device, wherein the high-pressure airflow enters the cylindrical elastic sealing cavity 25 at the lowest part of each grout stop plug 4 through two branch pipes 29 respectively, and stopping supplying air when the corresponding cylindrical elastic sealing cavity 25 expands to be in contact with the inner wall of the grouting pipe 1 and the pressure valve 28 is not opened;

step 4, starting the external oil supply device, discharging oil to the top of each slurry stop plug 4 through the oil supply pipe 11 through the two oil outlet holes, stopping oil supply after the oil surface overflows the top of each slurry stop plug 4, and starting the external pressure supply device again;

step 5, after the pressure in the cylindrical elastic sealing cavity 25 at the lowest part of each grout stop plug 4 is greater than the opening pressure of the upper pressure valve 28, the airflow enters the cylindrical elastic sealing cavity 25 at the upper part of the cylindrical elastic sealing cavity and expands the cylindrical elastic sealing cavity until the pressure in the cylindrical elastic sealing cavity 25 is greater than the opening pressure of the upper pressure valve 28, the airflow enters the next cylindrical elastic sealing cavity 25, the circulation is carried out until the pressure in each cylindrical elastic sealing cavity 25 is greater than the grouting pressure of grout, an oil seal layer (refer to a shaded part in fig. 6) is formed between every two adjacent cylindrical elastic sealing cavities 25, and an external pressure supply device is arranged;

step 6, an external grouting device supplies grout into the grout supply pipe 3, the grout flows into the grout outlet space through the grout supply hole 5, then flows into the annular grout outlet pipe 14 through the one-way check device 27, and overflows and is grouted through the grout overflow hole 15 until the grouting amount reaches the target grouting amount;

step 7, after grouting, the external pressure supply device generates negative pressure, air in each cylindrical elastic sealing cavity 25 is pumped out to be contracted into the corresponding grout stopping plug 4, and then the whole body formed by the grout supply pipe 3 and the two grout stopping plugs 4 is pumped to the next grout outlet hole 2;

and 8, repeating the steps 1-7 until all grouting holes finish grouting.

In particular, the oil supplied in the oil supply pipe 11 can be replaced by tap water for equipment flushing each time the grout stop 4 moves to a target position and before the next target position is required to be moved. For example, when the grout stop plug 4 moves to the target position, high-pressure tap water is firstly supplied into the oil supply pipe 11, the body of the grout stop plug 4 and the inner wall of the grouting pipe 1 are washed to wash away grout in the equipment, and then other steps such as oil supply are carried out; when the cylindrical elastic sealing cavity 25 is shrunk to the next target position after grouting is finished at one grout outlet 2, high-pressure tap water is supplied to the oil supply pipe 11, and the grout stopping plug 4 and the inner wall of the grouting pipe 1 are washed to wash away grout in the equipment, so that the equipment can be kept clean all the time, and the possibility and the attachment amount of the grout attached to the outer wall of the cylindrical elastic sealing cavity 25 are reduced.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. A layered grouting device comprises a grouting pipe (1), wherein a plurality of grout outlet holes (2) are formed in the side wall of the grouting pipe (1) from top to bottom, and the layered grouting device is characterized in that a grout supply pipe (3) with the top end connected with an external grouting device and the bottom end sealed is arranged in the grouting pipe (1), two cylindrical grout stopping plugs (4) fixedly connected with the grout supply pipe (3) are sleeved on the outer wall of the bottom end of the grout supply pipe (3) from top to bottom, the outer diameter of each grout stopping plug (4) is smaller than the inner diameter of the grouting pipe (1), a grout outlet space is arranged between the two grout stopping plugs (4), grout supply holes (5) are formed in the pipe body of the grout supply pipe (3) in the grout outlet space, each grout stopping plug (4) is composed of an external shell (6) and an internal elastic sealing cavity (7), a plurality of annular notches (8) are uniformly formed in the side wall of the external shell (6) in the vertical direction from top to bottom, the outer wall of the inner elastic sealing cavity (7) is attached to the inner wall of the outer shell (6), the two inner elastic sealing cavities (7) are connected through a connecting pipe (9), and the inner elastic sealing cavity (7) above the inner elastic sealing cavity is connected with an outer pressure supply device through an air supply pipe (10).

2. The layered grouting device according to claim 1, characterized in that an oil supply pipe (11) connected with an external oil supply device is further arranged in the grouting pipe (1), the bottom end of the oil supply pipe (11) penetrates through the upper slurry stop plug (4) and is fixedly connected with the top of the lower slurry stop plug (4), a first oil outlet (12) is formed in the oil supply pipe (11) above the upper slurry stop plug (4), and a second oil outlet (13) is formed in the oil supply pipe (11) between the two slurry stop plugs (4).

3. The layered grouting device according to claim 2, characterized in that the outer wall of the grouting pipe (1) where each grouting hole (2) is located is further connected with an annular grouting pipe (14) which wraps the grouting pipe in a self-generated manner, and the annular grouting pipe (14) is uniformly provided with grout overflow holes (15).

4. A stratified grouting device according to claim 3, characterised in that the outer casing (6) is formed by an upper cover (16), a plurality of middle supporting layers (17) and a lower cover (18) which are coaxially arranged and all of which are sleeved on the grout supply pipe (3) and are in threaded connection with the outer wall thereof, the upper cover (16) is formed by a first transverse circular plate (19) and a first annular vertical enclosing plate (20) which is integrated with the first transverse circular plate (19) and arranged at the bottom of the outer edge thereof, the middle supporting layer (17) is formed by a cylindrical cavity (21) and a second annular vertical enclosing plate (22) which is arranged at the top end outer edge and the bottom end outer edge of the cylindrical cavity (21), the lower cover (18) is formed by a second transverse circular plate (23) and a third annular vertical enclosing plate (24) which is integrated with the second transverse circular plate (23) and arranged at the top of the outer edge thereof, the inner diameters and the outer diameters of all the annular vertical enclosing plates are the same, the inner elastic sealing cavity (7) is formed by a plurality of cylindrical elastic sealing cavities (25) which are sleeved on the slurry supply pipe (3) and have the same outer diameter as the inner diameter of the first annular vertical enclosing plate (20), a cylindrical elastic sealing cavity (25) is respectively arranged between the upper cover (16) and the adjacent middle supporting layer (17), between the two adjacent middle supporting layers (17) and between the lower cover (18) and the adjacent middle supporting layer (17), the distance between the bottom of the upper cover (16) and the top of the adjacent middle supporting layer (17), the distance between the adjacent middle supporting layers (17) and the distance between the top of the lower cover (18) and the bottom of the adjacent middle supporting layer (17) are the same as the thickness of the cylindrical elastic sealing cavity (25), and the two adjacent cylindrical elastic sealing cavities (25) in the same slurry stop plug (4) are connected through a high-pressure pipe (26), two adjacent cylindrical elastic sealing cavities (25) in the two grout stopping plugs (4) are connected through a connecting pipe (9), and the cylindrical elastic sealing cavity (25) at the uppermost position is connected with an external air supply pipe (10).

5. A stratified grouting device according to claim 4, characterised in that the first transverse circular plate (19) is replaced by an upwardly convex arc-shaped plate.

6. The layered grouting device according to claim 5, characterized in that the exposed edge part of each annular enclosing plate is in the shape of a circular arc.

7. The layered grouting device according to claim 6, characterized in that the outer wall of the grouting pipe (1) corresponding to each grouting hole (2) is provided with a one-way check device (27) installed in the corresponding annular grouting pipe (14).

8. A stratified grouting device according to claim 7, characterized in that the connecting pipes (9) are eliminated, a pressure valve (28) is fixedly arranged on each high-pressure pipe (26), the pressure required by the expansion of the cylindrical elastic sealing cavity (25) to make the contact of the inner wall of the grouting pipe (1) is smaller than the pressure required by the opening of the pressure valve (28), two branch pipes (29) are arranged at the bottom of the external air supply pipe (10), and each branch pipe (29) is respectively connected with the cylindrical elastic sealing cavity (25) at the bottommost part of one grout stop plug (4).

9. The layered grouting device according to claim 8, characterized in that the grouting pipe (1) and the annular grouting pipe (1) are both fixedly installed in a reinforcement cage.