Grouting valve for post-grouting construction of pile foundation

Abstract

The grouting valve comprises an outer sleeve, an upper limiting sealing plate and a lower limiting sealing plate are correspondingly and fixedly arranged at the upper end and the lower end of the outer sleeve respectively, and a first slurry discharging hole is formed in the position, close to the middle, of the side wall of the outer sleeve; the inner sleeve is sleeved with the outer sleeve in the mode that the inner sleeve can be driven to slide in the length direction of the outer sleeve, the inner sleeve can be correspondingly limited by the upper limiting sealing plate and the lower limiting sealing plate after sliding upwards and downwards, and a second slurry discharging hole is formed in the position, close to the upper portion, of the side wall of the inner sleeve; the elastic piece is arranged in the outer sleeve and used for driving the inner sleeve to abut against the upper limiting sealing plate, a slurry passing hole is formed in the upper limiting sealing plate, and the top of the inner sleeve is sealed; the valve element is fixedly arranged on the lower limiting sealing plate, extends upwards and then penetrates through the top of the inner sleeve upwards, and a slurry passing groove is formed in the position, close to the middle, of the valve element; by means of the grouting valve, backflow of cement paste in a pile hole can be effectively blocked; the risk that a valve port of the valve body structure cannot be opened can be reduced; and the structure can be simplified.

Description

Technical Field

[0001] The utility model belongs to the technical field of building construction, and in particular relates to a grouting valve for post-grouting construction of pile foundation. Background Art

[0002] Post-grouting of pile foundation means that after a certain period of time, the grouting pipeline reserved in the pile body is used to inject cement-based slurry into the ground at the side and end of the pile through the grouting device through the ground pressure system. The pressure slurry fills, penetrates, compacts, replaces and consolidates the mud skin around the pile, the pile end and the nearby soil around the pile. By changing the physical and mechanical properties of the soil and the boundary conditions between the pile and the soil, the bearing capacity of the pile is improved and the settlement of the pile foundation is reduced.

[0003] The pipeline pre-buried after grouting of the pile foundation is usually a grouting steel pipe. A plurality of grouting holes are opened at the bottom of the grouting steel pipe. The grouting steel pipe is lowered into the pile hole together with the steel cage, and then the hole is cleaned and poured according to the bored pile process. In order to prevent the cement slurry from blocking the grouting steel pipe after solidification during the pouring of bored piles, the related technology blocks the reflux of cement slurry by setting a one-way valve structure at each grouting hole. Although the reflux of cement slurry can be effectively blocked, the existing one-way valve structure is basically in the form of opening outward under pressure. Since the outer side of the grouting hole is often wrapped with solidified cement slurry, it is easy to cause the grouting one-way valve to be difficult to open, so that the grouting amount cannot be guaranteed, and then the pile foundation bearing capacity cannot meet the requirements; and since an independent one-way valve structure needs to be set at each grouting hole, the overall production cost is high.

[0004] Therefore, there is an urgent need to provide a new valve body structure for post-grouting construction of pile foundation, which is required to be able to effectively block the backflow of cement slurry in the pile hole; at the same time, it can reduce the risk of the valve mouth of the valve body structure not being able to open and ensure the grouting quality; at the same time, it can help to simplify the structure and reduce the production cost. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a grouting valve for post-grouting construction of pile foundation, which can effectively block the backflow of cement slurry in the pile hole; at the same time, it can reduce the risk of the valve body structure not being able to open the valve port, thereby ensuring the grouting quality; at the same time, it can help to simplify the structure and reduce the production cost.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a grouting valve for post-grouting construction of pile foundation, comprising: an outer sleeve, wherein the upper and lower ends of the outer sleeve are respectively fixed with an upper limit sealing plate and a lower limit sealing plate, and the side wall of the outer sleeve is provided with a first row of slurry holes near the middle; an inner sleeve, wherein the inner sleeve is sleeved inside the outer sleeve in a manner that it can be driven to slide along the length direction of the outer sleeve, and the inner sleeve can be limited by the upper limit sealing plate and the lower limit sealing plate respectively after sliding upward and downward, and the side wall of the inner sleeve is provided with a second row of slurry holes near the upper position. When the inner sleeve When it is in the upper limit sealing plate position, the lower part of the inner sleeve closes the first row of slurry holes, and when the inner sleeve is in the lower limit sealing plate position, the second row of slurry holes is connected with the first row of slurry holes; an elastic member is built into the outer sleeve and is used to drive the inner sleeve to abut against the upper limit sealing plate, the upper limit sealing plate is provided with a slurry hole, and the top of the inner sleeve is sealed; a valve core is fixedly arranged on the lower limit sealing plate and extends upward and then passes through the top of the inner sleeve, and a slurry groove is provided near the middle of the valve core, and the slurry groove is used to ensure that the slurry hole is connected with the second row of slurry holes when the inner sleeve is in the lower limit sealing plate position.

[0007] Furthermore, the elastic member is a compression spring, and the compression spring is sleeved on the valve core.

[0008] Furthermore, the slurry passage groove is an annular groove arranged along the circumference of the valve core.

[0009] Furthermore, the annular groove has two axial ends that transition to the side wall surface of the valve core at an oblique angle.

[0010] Furthermore, the valve core and the lower limit sealing plate are an integrated structure, and the lower limit sealing plate is threadedly connected to the outer sleeve.

[0011] Furthermore, the first row of pulp holes is evenly distributed in a plurality along the circumference of the outer casing.

[0012] Furthermore, the second row of slurry holes is evenly distributed in a plurality along the circumferential direction of the inner casing, and the second row of slurry holes is waist-shaped holes arranged along the axial direction of the inner casing.

[0013] Furthermore, two sealing rings I are arranged at intervals on the lower portion of the outer circumferential surface of the inner sleeve, and when the inner sleeve is in the upper limit sealing position, the two sealing rings I are respectively located at the upper and lower ends of the first row of slurry holes.

[0014] Furthermore, a sealing ring II is provided on the top end surface of the inner sleeve to surround the slurry passage hole, and a sealing ring III is provided at the through-fitting portion between the valve core and the inner sleeve.

[0015] Furthermore, it also includes a metal filter screen which is coated on the outer sleeve and shields the first row of pulp holes.

[0016] The beneficial effects of the utility model are as follows:

[0017] The grouting valve for post-grouting construction of pile foundation provided by the utility model can effectively block the backflow of cement slurry in the pile hole; at the same time, it can reduce the risk of the valve body structure valve port not being able to be opened, thereby ensuring the quality of grouting; at the same time, it can be helpful to simplify the structure and reduce the manufacturing cost; specifically, under the action of the elastic member, it can be ensured that when grouting is not pressurized, the first row of slurry holes on the outer sleeve are always in a closed state, that is, the first row of slurry holes can only be opened from the inside of the outer sleeve, and the grouting in the pile hole will not flow back into the outer sleeve during the pouring construction, the structure is reliable, and is less affected by the construction environment outside the first row of slurry holes; because the inner sleeve slides inside the outer sleeve, it is not affected by the solidified concrete outside the first row of slurry holes when moving, and it only needs to overcome the set elastic member when moving. Resistance is sufficient, and controllability is high. It can effectively reduce the risk of the valve body structure not being able to open the valve port, ensure the grouting quality, and then ensure that the bearing capacity of the pile foundation meets the requirements; of course, on the other hand, since the first row of slurry holes is reliably blocked when no grouting is performed, the external cement slurry will not flow back to the bottom of the outer casing, which will not affect the movement of the inner casing; in this structure, only the matching structure of an inner casing and a valve core is adopted to realize the on-off control of the first row of slurry holes and the slurry holes, which has a simple structure and is conducive to reducing the production cost; of course, the grouting valve can also be used multiple times in the same post-grouting construction process, and it only needs to use clean water to clean the slurry in the grouting valve before the slurry solidifies after grouting.

[0018] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and will be apparent to those skilled in the art based on the following examination and research, or can be taught from the practice of the present invention to some extent. The objectives and other advantages of the present invention can be achieved and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure cross section of the utility model without grouting

[0020] Figure 2 This is a schematic diagram of the overall structure cross section of the utility model during grouting

[0021] Figure 3 This is a schematic diagram of the explosion structure of the utility model

[0022] Figure markings: 1-outer sleeve; 101-first row of slurry holes; 2-upper limit sealing plate; 201-slurry hole; 3-lower limit sealing plate; 4-inner sleeve; 401-second row of slurry holes; 5-elastic member; 6-valve core; 601-slurry groove; 601a-bevel; 7-sealing ring I; 8-sealing ring II; 9-sealing ring III; 10-metal filter. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0024] It should be noted that the up and down direction in the following text refers to the vertical direction of the pile hole when in use.

[0025] See also Figure 1-3 This embodiment discloses a grouting valve for post-grouting construction of pile foundation, comprising:

[0026] An outer sleeve 1, wherein an upper limit sealing plate 2 and a lower limit sealing plate 3 are respectively fixedly disposed at the upper and lower ends of the outer sleeve 1, and a first row of slurry holes 101 is disposed near the middle of the side wall of the outer sleeve 1. Specifically, the outer sleeve 1 is preferably made of a steel pipe, and the upper limit sealing plate 2 and the lower limit sealing plate 3 can be welded and fixed to the outer sleeve 1. The "sealing plate" refers to closing the corresponding ends, and the first row of slurry holes 101 is preferably arranged in a plurality along the circumference of the outer sleeve 1;

[0027] An inner casing 4, wherein the inner casing 4 is sleeved inside the outer casing 1 in a manner that it can be driven to slide along the length direction of the outer casing 1, and after the inner casing 4 slides upward and downward, it can be respectively limited by the upper limit sealing plate 2 and the lower limit sealing plate 3. A second row of slurry holes 401 is provided near the upper part of the side wall of the inner casing 4. When the inner casing 4 is at the upper limit sealing plate 2 position, the lower part of the inner casing 4 closes the first row of slurry holes 101. When the inner casing 4 is at the lower limit sealing plate 3 position, the second row of slurry holes 401 is connected with the first row of slurry holes 101. Here, the inner casing 4 is preferably made of a steel pipe;

[0028] The elastic member 5 is built into the outer sleeve 1 and is used to drive the inner sleeve 4 to abut against the upper limit sealing plate 2. The upper limit sealing plate 2 is provided with a slurry hole 201. The top of the inner sleeve 4 is sealed. Specifically, the elastic member 5 is a compression spring. The two ends of the compression spring are respectively correspondingly abutted against the top of the inner sleeve 4 and the lower limit sealing plate 3. The top of the inner sleeve 4 is sealed by a sealing plate which is an integral structure with the inner sleeve 4. During grouting, the grouting pressure overcomes the elastic force of the elastic member 5 to drive the inner sleeve 4 to move downward;

[0029] The valve core 6 is fixedly mounted on the lower limit sealing plate 3 and extends upward to penetrate the top of the inner sleeve 4, and a slurry groove 601 is provided near the middle of the valve core 6. The slurry groove 601 is used to connect the slurry holes 201 with the second row of slurry holes 401 when the inner sleeve 4 is at the position of the lower limit sealing plate 3. Specifically, the valve core 6 and the lower limit sealing plate 3 are preferably an integral structure. It can be understood that the part where the valve core 6 is connected to the top of the inner sleeve 4 is a movable connection, that is, it does not affect the up and down movement of the inner sleeve 4. It is preferably a sliding sealing connection here. The slurry groove 601 is preferably an annular groove. When the inner sleeve 4 moves to the position of the slurry groove 601, the cement slurry flowing out of the slurry hole 201 can flow to the lower part of the inner sleeve 4 through the slurry groove 601, and then flow to the second row of slurry holes 401. The valve core 6 is preferably an iron core.

[0030] In the above structural design, under the action of the elastic member 5, it can be ensured that when there is no pressurized grouting, the first row of grout holes 101 on the outer sleeve 1 is always in a closed state, that is, the first row of grout holes 101 can only be opened from the inside of the outer sleeve 1, and the grouting in the pile hole will not flow back into the outer sleeve 1. The structure is reliable and is less affected by the external construction environment of the first row of grout holes 101. Since the inner sleeve 4 slides inside the outer sleeve 1, it is not affected by the solidified concrete outside the first row of grout holes 101 when moving. When moving, it only needs to overcome the set resistance of the elastic member 5. It has high controllability, can effectively reduce the risk of the valve body structure valve port not being able to open, and ensure the quality of grouting. Of course, on the other hand, since the first row of grouting holes 101 are reliably blocked when not grouting, the external cement slurry will not flow back to the bottom of the outer casing 1, which will not affect the movement of the inner casing 4; in this structure, only the matching structure of the inner casing 4 and the valve core 6 is adopted to realize the on-off control of the first row of grouting holes 101 and the grouting holes 201, which has a simple structure and is conducive to reducing the manufacturing cost; of course, the grouting valve can also be used multiple times in the same post-grouting construction process, and it is only necessary to clean the grouting liquid in the grouting valve with clean water before the grouting liquid solidifies after grouting.

[0031] In this embodiment, the elastic member 5 is a compression spring, and the compression spring is sleeved on the valve core 6. The compression spring has good elasticity, which is beneficial to providing sufficient movement stroke for the inner sleeve 4. The compression spring is sleeved on the valve core 6, and the valve core 6 is used to complete the movement guidance of the compression spring, thereby ensuring the smoothness of the movement and further simplifying the installation structure.

[0032] In this embodiment, the slurry passage groove 601 is an annular groove arranged along the circumference of the valve core 6. The annular groove is easy to process and is conducive to forming the largest slurry passage between the valve core 6 and the valve core 6.

[0033] In this embodiment, the bevel angles 601a at both axial ends of the annular groove transition to the side wall surface of the valve core 6. By designing the bevel transition structure, it is helpful to reduce the jamming of the inner sleeve 4 during movement, and of course it is also helpful to form a larger slurry passage, while also helping to improve the structural strength of the valve core 6.

[0034] In this embodiment, the valve core 6 and the lower limit sealing plate 3 are an integral structure, and the lower limit sealing plate 3 is threadedly connected to the outer sleeve 1; the structure is simple, which is convenient for processing and manufacturing, and is convenient for on-site assembly, reducing hot work construction.

[0035] In this embodiment, the first row of grouting holes 101 are evenly distributed in a plurality along the circumference of the outer casing 1 , and are arranged in a plurality along the circumference, which is conducive to discharging the grouting liquid to a plurality of places, and further improves the quality of the post-grouting construction.

[0036] In this embodiment, the second row of pulp holes 401 are evenly distributed in a plurality along the circumference of the inner sleeve 4, and the second row of pulp holes 401 are waist-shaped holes arranged axially along the inner sleeve 4; this structural design is beneficial to reducing the impact of manufacturing tolerances while ensuring the use function, and further reducing the production cost. The structural design of the waist-shaped holes allows a certain axial and circumferential misalignment, and can also ensure the connectivity between the second row of pulp holes 401 and the first row of pulp holes 101.

[0037] In the present embodiment, two sealing rings Ⅰ7 are provided at intervals at the lower position on the outer circumferential surface of the inner casing 4, and the two sealing rings Ⅰ7 are respectively located at the upper and lower ends of the first row of slurry holes 101 when the inner casing 4 is in the upper limit sealing plate 2 position; specifically, the sealing rings Ⅰ7 here are all O-type sealing rings, and the installation of O-type sealing rings is a prior art, such as opening an installation groove on the inner casing 4 to complete the installation of the sealing ring, which will not be repeated here; by providing two sealing rings Ⅰ, the sealing performance of the fitting part between the inner casing 4 and the outer casing 1 can be further improved, and water seepage in the pile hole can be prevented from entering the interior of the outer casing 1 and affecting the overall success rate of valve opening.

[0038] In this embodiment, the top end surface of the inner sleeve 4 is provided with a sealing ring II8 surrounding the slurry hole 201, and the through-fitting portion of the valve core 6 and the inner sleeve 4 is provided with a sealing ring III9; the design of the sealing ring II8 and the sealing ring III9 is ​​conducive to further improving the sealing performance of the inner sleeve 4 and the upper limit sealing plate 3, as well as the through-fitting portion of the valve core 6 and the inner sleeve 4, thereby preventing water from seeping into the outer sleeve 1 from the grouting pipe and affecting the overall success rate of valve opening.

[0039] In this embodiment, it also includes a metal filter 10 that is coated on the outer sleeve 1 and blocks the first row of pulp holes 101; here, the metal filter 10 can be fixed to the outer wall of the outer sleeve 1 by welding or the like; by setting up the metal filter 10, large particles of stone and the like can be prevented from getting stuck in the first row of pulp holes 101 during use and affecting the sliding of the inner sleeve 4, thereby further improving the protection and reliability of use; the metal filter 10 has high durability and reliability.

[0040] Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A grouting valve for post-grouting construction of pile foundation, characterized in that: include: An outer sleeve (1), wherein an upper limit sealing plate (2) and a lower limit sealing plate (3) are fixedly disposed at the upper and lower ends of the outer sleeve (1), respectively, and a first row of pulp holes (101) is disposed at the middle of the side wall of the outer sleeve (1); An inner sleeve (4), wherein the inner sleeve (4) is sleeved inside the outer sleeve (1) in a manner that it can be driven to slide along the length direction of the outer sleeve (1), and after the inner sleeve (4) slides upward and downward, it can be respectively limited by the upper limit sealing plate (2) and the lower limit sealing plate (3), and a second row of pulp holes (401) is provided at the upper part of the side wall of the inner sleeve (4); when the inner sleeve (4) is in the position of the upper limit sealing plate (2), the lower part of the inner sleeve (4) closes the first row of pulp holes (101); when the inner sleeve (4) is in the position of the lower limit sealing plate (3), the second row of pulp holes (401) is connected to the first row of pulp holes (101); An elastic member (5) is built into the outer sleeve (1) and is used to drive the inner sleeve (4) to abut against the upper limit sealing plate (2), wherein the upper limit sealing plate (2) is provided with a slurry hole (201), and the top of the inner sleeve (4) is sealed; The valve core (6) is fixedly mounted on the lower limit sealing plate (3) and extends upward to penetrate the top of the inner sleeve (4). A slurry passage groove (601) is provided near the middle of the valve core (6). The slurry passage groove (601) enables the slurry passage hole (201) to be connected with the second row of slurry holes (401) when the inner sleeve (4) is in the position of the lower limit sealing plate (3).

2. The grouting valve for post-grouting construction of pile foundation according to claim 1, characterized in that: The elastic member (5) is a compression spring, and the compression spring is sheathed on the valve core (6).

3. The grouting valve for post-grouting construction of pile foundation according to claim 2, characterized in that: The slurry passage groove (601) is an annular groove arranged along the circumference of the valve core (6).

4. The grouting valve for post-grouting construction of pile foundation according to claim 3, characterized in that: The bevel angles (601a) at both axial ends of the annular groove transition to the side wall surface of the valve core (6).

5. The grouting valve for post-grouting construction of pile foundation according to claim 2, characterized in that: The valve core (6) and the lower limit sealing plate (3) are an integrated structure, and the lower limit sealing plate (3) is threadedly connected to the outer sleeve (1).

6. The grouting valve for post-grouting construction of pile foundation according to claim 1, characterized in that: The first row of pulp holes (101) is arranged in plurality and evenly distributed along the circumference of the outer casing (1).

7. The grouting valve for post-grouting construction of pile foundation according to claim 6, characterized in that: The second row of pulp holes (401) is evenly distributed in a plurality along the circumference of the inner sleeve (4), and the second row of pulp holes (401) are waist-shaped holes arranged axially along the inner sleeve (4).

8. The grouting valve for post-grouting construction of pile foundation according to claim 1, characterized in that: Two sealing rings I (7) are arranged at intervals at the lower position of the outer peripheral surface of the inner sleeve (4), and when the inner sleeve (4) is in the upper limit sealing plate (2) position, the two sealing rings I (7) are respectively located at the upper and lower ends of the first row of pulp holes (101).

9. The grouting valve for post-grouting construction of pile foundation according to claim 8, characterized in that: The top end surface of the inner sleeve (4) is provided with a sealing ring II (8) surrounding the slurry passage hole (201), and the through-fitting portion between the valve core (6) and the inner sleeve (4) is provided with a sealing ring III (9).

10. The grouting valve for post-grouting construction of pile foundation according to claim 1, characterized in that: It also includes a metal filter screen (10) which is disposed on the outer sleeve (1) and covers the first row of pulp holes (101).

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