Adjustable grouting steel pipe for off-layer grouting

Abstract

The utility model relates to a adjustable grouting steel pipe of delamination grouting belongs to foundation pit engineering construction technical field, including the pipe body and the outside pipe body of the sleeve in the pipe body outside, install the connecting block for the fixed between the outside pipe body and the pipe body, and the connecting block divides the area between the outside pipe body and the pipe body into fixed area and delivery area, the utility model discloses a support device is set up, and the fixed plate can be driven to resist the inner wall of foundation pit by rotating the step ring, realizes the quick fixing of grouting steel pipe, effectively prevents the deviation of steel pipe because of grout pressure or stratum disturbance in the grouting process, guarantees the grouting position accuracy. The setting of straight delivery pipe reduces the grout delivery resistance, and the staggered layout of the delivery port and the discharge port avoids grout blockage and excessive local pressure, ensures uniform distribution of grout and injection into the stratum, improves grouting efficiency and quality, and the design of T-shaped port expands the grouting range, further improves the grouting effect.

Description

Technical Field

[0001] This utility model relates to the field of foundation pit construction technology, specifically to an adjustable grouting steel pipe for delamination grouting. Background Technology

[0002] In the process of foundation pit excavation and support construction, in order to effectively control the settlement of the strata around the foundation pit and improve the stability of the foundation pit support structure, delamination grouting technology is often used. This technology injects grout into the delamination area of ​​the strata around the foundation pit to fill the voids in the strata and cement the loose soil, thereby improving the mechanical properties of the strata.

[0003] As the core equipment in delamination grouting technology, the structural rationality of grouting steel pipes directly affects the grouting effect and construction efficiency. Currently, existing grouting steel pipes generally suffer from the following problems: Poor stability: After traditional grouting steel pipes are inserted into the designated position in the foundation pit, they lack a reliable support and fixing structure. They are prone to displacement due to grout pressure or ground disturbance, resulting in deviation of the grouting position and affecting the grouting quality.

[0004] Low grout delivery efficiency: Some grout delivery channels in grouting steel pipes are poorly designed, and the layout of the delivery port and outlet is chaotic, which can easily lead to grout blockage or uneven delivery, thus reducing grouting efficiency.

[0005] Difficulty in insertion: The lower end structure of some grouting steel pipes is poorly designed, resulting in greater resistance when inserted into the foundation pit stratum, which increases the difficulty of construction and labor costs.

[0006] To address the shortcomings of the existing technologies, there is an urgent need to design an adjustable grouting steel pipe for delamination grouting that is stable, efficient in grout delivery, highly adaptable, and easy to insert, in order to meet the requirements of high-quality construction in foundation pit engineering. Utility Model Content

[0007] This utility model aims to solve the above-mentioned technical problems by providing an adjustable grouting steel pipe for delamination grouting.

[0008] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows: An adjustable grouting steel pipe for delamination grouting includes a conveying pipe body and an outer pipe body fitted outside the conveying pipe body. A connecting block for fixing is installed between the outer pipe body and the conveying pipe body, and the connecting block divides the area between the outer pipe body and the conveying pipe body into a fixing area and a conveying area. Multiple sets of guide blocks are installed in the conveying area to guide and limit the external pipe and the conveying pipe. The fixed area is equipped with a support device for fixing the inner wall of the foundation pit; Multiple sets of conveying ports for conveying slurry into the conveying area are provided on the conveying pipe body and below the connecting block; Multiple discharge ports for conveying slurry into the foundation pit are provided on the outer side of the external pipe; an insertion block for easy insertion into the stratum is installed at the lower end of the external pipe.

[0009] Furthermore, a direct conveying pipe that can be connected to the conveying port is installed inside the conveying pipe. The direct conveying pipe can directly convey the slurry to the conveying port, reducing the flow resistance of the slurry in the conveying pipe, improving the slurry conveying efficiency, and at the same time avoiding slurry residue inside the conveying pipe that could cause blockage.

[0010] Furthermore, the support device includes a fixed plate that abuts against the inner wall of the pit and a connecting rod that slides on the conveying pipe. A first hinged arm and a second hinged arm are respectively hinged to both ends of the fixed plate. The other end of the first hinged arm is hinged to the outside of the conveying pipe, and the other end of the second hinged arm is hinged to the lower end of the connecting rod. A sliding abutment plate is installed on the connecting rod within the fixed area, and a hanging ring is installed on the abutment plate. A stepping ring connected to the outer pipe via a thread is provided within the fixed area. By rotating the stepping ring, the abutment plate can be pushed to move axially along the conveying pipe, thereby causing the connecting rod to slide. This allows the second hinged arm to cooperate with the first hinged arm to move the fixed plate, thus ensuring the fixed plate tightly abuts against the inner wall of the pit, achieving reliable fixation of the grouting steel pipe and effectively preventing pipe displacement during grouting.

[0011] Furthermore, the stepping ring is equipped with an n-shaped handle, which makes it easier for construction personnel to rotate the stepping ring and reduces the difficulty of operation; the outer side of the conveying pipe is provided with a sliding groove that cooperates with the connecting rod to slide, and the sliding groove provides sliding guidance for the connecting rod to ensure stable movement of the connecting rod; the outer pipe is provided with a movable hole that cooperates with the movement of the first hinge arm and the second hinge arm, and the movable hole provides sufficient space for the opening and closing of the hinge arm to avoid interference from the outer pipe to the movement of the hinge arm.

[0012] Furthermore, the lower end of the insertion block is pointed, and the pointed structure can reduce the resistance when inserting into the stratum, making it easier for the grouting steel pipe to be quickly inserted into the designated position; multiple sets of connecting ribs are installed between the lower end of the outer pipe and the insertion block, and the connecting ribs can enhance the connection strength between the insertion block and the outer pipe, preventing the insertion block from falling off or being damaged during the insertion process.

[0013] Furthermore, the lower end of the conveying pipe is pointed, and the pointed design further reduces the resistance of the conveying pipe when inserted into the formation; multiple sets of T-shaped openings for conveying grout are opened on the outer side of the lower end of the conveying pipe, and the T-shaped openings can realize the conveying of grout to the formation below the conveying pipe, expand the grouting range, and improve the grouting effect.

[0014] Furthermore, the outer side of the guide block is inclined. The inclined structure can reduce the resistance of the grout when it flows in the delivery zone, and at the same time provide stable support for the external pipe and the delivery pipe, preventing them from shifting relative to each other during the grouting process.

[0015] Furthermore, the discharge port and the conveying port are staggered. This staggered layout can prevent the slurry from flowing directly from the conveying port into the discharge port, which would cause excessive local pressure. It ensures that the slurry is evenly distributed in the conveying area before being injected into the formation through the discharge port, thereby improving the uniformity of grouting.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This utility model, by setting up a support device, can drive the fixing plate to abut against the inner wall of the foundation pit by rotating the stepping ring, thereby achieving rapid fixing of the grouting steel pipe. This effectively prevents the steel pipe from shifting due to grout pressure or ground disturbance during the grouting process, ensuring accurate grouting position.

[0017] The direct delivery pipe of this invention reduces the resistance to grout delivery, and the staggered layout of the delivery port and discharge port avoids grout blockage and excessive local pressure, ensuring that the grout is evenly distributed and injected into the formation, thereby improving grouting efficiency and quality. At the same time, the T-shaped port design expands the grouting range and further enhances the grouting effect.

[0018] The support device of this utility model can adjust the opening and closing degree of the fixing plate by adjusting the stepping ring, which is suitable for fixing the inner wall of foundation pits of different sizes; the inclined setting of the guide block and the flexible cooperation of each component enable the steel pipe to adapt to construction scenarios with different depths and geological conditions.

[0019] The pointed design of the insertion block and the lower end of the delivery pipe in this invention significantly reduces the resistance of the steel pipe when inserted into the stratum. Combined with the structural strength enhanced by the connecting ribs, the steel pipe insertion process is more convenient and stable, reducing construction labor and time costs.

[0020] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present invention will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1This is a schematic diagram of the structure of this utility model; Figure 2 This is an exploded view of this utility model.

[0023] As shown in the figure: 1. Conveying pipe body; 2. Outer pipe body; 3. Connecting block; 4. Guide block; 5. Support device; 501. First hinged arm; 502. Second hinged arm; 503. Fixing plate; 504. Connecting rod; 505. Support plate; 506. Hanging ring; 507. Stepping ring; 6. Fixing area; 7. Conveying area; 8. Discharge port; 9. Insertion block; 10. Connecting rib; 11. T-shaped opening; 12. Straight conveying pipe; 13. N-shaped handle; 14. Slide groove; 15. Movable hole; 16. Conveying port. Detailed Implementation

[0024] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0025] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0026] The present invention will now be described in further detail in conjunction with the full text.

[0027] Combined with appendix Figure 1 and Figure 2 An adjustable grouting steel pipe for delamination grouting includes a conveying pipe body 1 and an outer pipe body 2 fitted outside the conveying pipe body 1. A connecting block 3 for fixing is welded between the outer pipe body 2 and the conveying pipe body 1. The connecting block 3 divides the annular area between the outer pipe body 2 and the conveying pipe body 1 into an upper fixing area 6 and a lower conveying area 7. The connecting block 3 is made of stainless steel to ensure connection strength and corrosion resistance.

[0028] In practical use, this utility model has multiple sets of guide blocks 4 welded in the conveying zone 7 to guide and limit the outer pipe 2 and the conveying pipe 1. The outer side of the guide block 4 is inclined with an inclination angle of 30°-45°. This inclined structure can reduce the resistance of the slurry when it flows in the conveying zone 7, and at the same time enhance the connection stability between the outer pipe 2 and the conveying pipe 1, preventing relative shaking between the two during the grouting process.

[0029] In practical use, this utility model, such as Figure 2 As shown, a support device 5 for fixing the inner wall of the foundation pit is installed in the fixed area 6. The support device 5 includes a fixed plate 503 that can abut against the inner wall of the foundation pit and a connecting rod 504 that slides on the conveying pipe 1. A rubber pad is pasted on the inner side of the fixed plate 503. The rubber pad can increase the friction between the fixed plate 503 and the inner wall of the foundation pit, while avoiding hard damage to the inner wall of the foundation pit caused by the fixed plate 503. The two ends of the fixed plate 503 are respectively hinged to a first hinge arm 501 and a second hinge arm 502 by pins. The other end of the first hinge arm 501 is hinged to the outside of the conveying pipe 1 by a pin, and the other end of the second hinge arm 502 is hinged to the lower end of the connecting rod 504 by a pin. A welding rod is welded on the connecting rod 504. A sliding support plate 505 slides within the fixed area 6. A hanging ring 506 is welded onto the support plate 505. The hanging ring 506 can be used to connect hoisting equipment, facilitating the overall disassembly of the support plate 505. The fixed area 6 is provided with a stepping ring 507 that is threadedly connected to the outer pipe 2. The inner side of the stepping ring 507 has an internal thread, and the corresponding position of the outer pipe 2 has an external thread. Through the cooperation of the internal and external threads, the stepping ring 507 can move along the axial direction of the outer pipe 2. The movement of the stepping ring 507 will push the hanging ring 506 on the support plate 505, thereby achieving movement. This allows the first hinge arm 501 and the second hinge arm 502 to form a triangle, so that the fixed plate 503 abuts against the inner wall of the pit, completing the support.

[0030] Specifically, an n-shaped handle 13 is welded onto the stepping ring 507, and an anti-slip sleeve is fitted on the outside of the n-shaped handle 13. The anti-slip sleeve can increase the friction between the hand and the n-shaped handle 13, making it easier for construction personnel to rotate the stepping ring 507. A sliding groove 14 is provided on the outside of the conveying pipe 1 to cooperate with the sliding of the connecting rod 504. The length of the sliding groove 14 matches the sliding stroke of the connecting rod 504 to ensure that the connecting rod 504 can slide stably. An active hole 15 is provided on the outer pipe 2 to cooperate with the movement of the first hinge arm 501 and the second hinge arm 502. The size of the active hole 15 is larger than the cross-sectional size of the hinge arm to avoid the hinge arm from colliding with the outer pipe 2 during the movement.

[0031] Specifically, the lower end of the outer tube 2 is welded with an insertion block 9 for easy insertion into the formation. The lower end of the insertion block 9 is pointed, and the cone angle of the pointed structure is 20°-30°, which can effectively reduce the resistance when inserting into the formation. Multiple sets of connecting ribs 10 are welded between the lower end of the outer tube 2 and the insertion block 9. The connecting ribs 10 are evenly distributed radially, and there are 3-4 sets, which further enhance the connection strength between the insertion block 9 and the outer tube 2 and prevent the insertion block 9 from deforming or falling off when inserted into hard formations.

[0032] Specifically, the lower end of the conveying pipe 1 is pointed, and the pointed structure is adapted to the pointed structure of the insertion block 9 to reduce the resistance of the steel pipe being inserted into the stratum. Multiple sets of T-shaped ports 11 for conveying slurry are opened on the outer side of the lower end of the conveying pipe 1. The T-shaped ports 11 are evenly distributed along the circumference of the conveying pipe 1, with a quantity of 4-6 sets, which can realize the uniform delivery of slurry to the stratum below the conveying pipe 1 and expand the grouting coverage area.

[0033] Specifically, a straight conveying pipe 12, which connects to the conveying port 16, is welded inside the conveying pipe body 1. The upper end of the straight conveying pipe 12 is connected to the external grouting equipment, and the lower end is connected to the conveying port 16. The inner diameter of the straight conveying pipe 12 is slightly smaller than the diameter of the conveying port 16 to ensure that the grout can completely enter the conveying zone 7 through the conveying port 16. Multiple sets of conveying ports 16 for conveying grout into the conveying zone 7 are opened on the conveying pipe body 1 and below the connecting block 3. The conveying ports 16 are evenly distributed along the circumference of the conveying pipe body 1. Multiple sets of discharge ports 8 for conveying grout into the foundation pit are opened on the outer side of the outer pipe body 2. The discharge ports 8 are evenly distributed along the axial and circumferential directions of the outer pipe body 2, with a number of 8-12 sets. The discharge ports 8 and the conveying ports 16 are staggered, that is, the projection of the conveying port 16 on the outer pipe body 2 does not overlap with the discharge port 8, to avoid the grout flowing directly from the conveying port 16 into the discharge port 8, and to ensure that the grout is fully diffused in the conveying zone 7 before being injected into the formation.

[0034] The working principle of this utility model is as follows: Equipment positioning and insertion: The grouting steel pipe is hoisted to the designated grouting position in the foundation pit. Using the insertion block 9 and the pointed structure at the lower end of the conveying pipe 1, the steel pipe is slowly inserted into the stratum to the preset depth.

[0035] Fixing device adjustment: The construction worker turns the n-type handle 13, which drives the stepping ring 507 to move downward along the outer pipe body 2. The stepping ring 507 pushes the abutment plate 505 to slide downward along the slide groove 14 of the conveying pipe body 1. The abutment plate 505 drives the connecting rod 504 to move downward, so that the second hinge arm 502 pushes the fixing plate 503 to open outward until the rubber pad on the fixing plate 503 tightly abuts against the inner wall of the foundation pit, thus completing the fixing of the grouting steel pipe.

[0036] Grout delivery and injection: Connect the external grouting equipment to the upper end of the direct delivery pipe 12, or directly deliver the grout into the delivery pipe 1. Start the grouting equipment, and the grout is delivered through the direct delivery pipe 12 to the delivery port 16 and into the delivery pipe 1, entering the delivery zone 7. In the delivery zone 7, the grout is evenly diffused by the guide block, and then injected into the delamination area of ​​the strata around the foundation pit through the discharge port 8 on the external pipe 2. At the same time, some grout is injected into the lower strata through the T-shaped port 11 at the lower end of the delivery pipe 1, so as to achieve full grouting.

[0037] Equipment recovery: After grouting is completed, rotate the n-type handle 13 in the reverse direction to move the stepping ring 507 upward. Disassemble the stepping ring 507, and then connect the hanging ring 506 through the hoisting equipment. This will drive the abutment plate 505 at the lower end of the hanging ring 506 to move upward. The abutment plate 505 and the connecting rod 504 will move upward accordingly. The second hinge arm 502 will pull the fixing plate 503 back, releasing the fixation on the inner wall of the foundation pit. Then, the grouting steel pipe will be pulled out of the stratum through the hoisting equipment to complete the construction.

[0038] The present invention and its embodiments have been described above. This description is not restrictive, and the embodiments shown throughout the text are only one of the embodiments of the present invention. The actual structure is not limited to this. In conclusion, if a person skilled in the art is inspired by this description and designs a similar structure and embodiment without departing from the inventive spirit of the present invention, such design should fall within the protection scope of the present invention.

Claims

1. An adjustable grouting steel pipe for delamination grouting, characterized in that, It includes a conveying pipe (1) and an outer pipe (2) fitted outside the conveying pipe (1), and a connecting block (3) for fixing is installed between the outer pipe (2) and the conveying pipe (1), and the connecting block (3) divides the outer pipe (2) and the conveying pipe (1) into a fixing area (6) and a conveying area (7). Multiple sets of guide blocks (4) for the outer pipe (2) and the conveying pipe (1) are installed in the conveying area (7); The fixed area (6) is equipped with a support device (5) for fixing the inner wall of the foundation pit; Multiple sets of conveying ports (16) for conveying slurry into the conveying zone (7) are opened on the conveying pipe (1) and below the connecting block (3). Multiple sets of discharge ports (8) for conveying slurry into the foundation pit are opened on the outside of the outer pipe (2). The lower end of the outer tube (2) is equipped with an insertion block (9) for insertion.

2. The adjustable grouting steel pipe for delamination grouting according to claim 1, characterized in that: The conveying pipe body (1) is equipped with a direct conveying pipe (12) that can be connected to the conveying port (16).

3. The adjustable grouting steel pipe for delamination grouting according to claim 1, characterized in that: The support device (5) includes a fixed plate (503) that can abut against the inner wall of the pit and a connecting rod (504) that slides on the conveying pipe (1). The fixed plate (503) has a first hinge arm (501) and a second hinge arm (502) hinged at both ends. The other end of the first hinge arm (501) is hinged to the outside of the conveying pipe (1), and the other end of the second hinge arm (502) is hinged to the lower end of the connecting rod (504). The connecting rod (504) is equipped with a stop plate (505) that slides in the fixed area (6). The stop plate (505) is equipped with a hanging ring (506). The fixed area (6) is provided with a stepping ring (507) that is threadedly connected to the outer pipe (2).

4. The adjustable grouting steel pipe for delamination grouting according to claim 3, characterized in that: The stepping ring (507) is equipped with an n-shaped handle (13), and the outer side of the conveying tube (1) is provided with a sliding groove (14) for sliding with the connecting rod (504). The outer tube (2) is provided with an active hole (15) for moving with the first hinge arm (501) and the second hinge arm (502).

5. The adjustable grouting steel pipe for delamination grouting according to claim 1, characterized in that: The lower end of the insertion block (9) is pointed, and multiple sets of connecting ribs (10) are installed between the lower end of the outer tube (2) and the insertion block (9).

6. The adjustable grouting steel pipe for delamination grouting according to claim 1, characterized in that: The lower end of the conveying pipe (1) is pointed, and multiple sets of T-shaped openings (11) for conveying slurry are opened on the outer side of the lower end of the conveying pipe (1).

7. The adjustable grouting steel pipe for delamination grouting according to claim 1, characterized in that: The outer side of the guide block (4) is inclined.

8. The adjustable grouting steel pipe for delamination grouting according to claim 1, characterized in that: The discharge port (8) and the conveying port (16) are arranged alternately.

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