Composite pipe pile suitable for narrow site and construction method

Abstract

According to the composite pipe pile suitable for the narrow field and the construction method, effective pipe pile sinking can be achieved through a mechanical arm, gravel grouting is adopted to fill a prefabricated pipe pile body and a grouting steel pipe section, and the end of the prefabricated pipe pile body and the grouting steel pipe section are effectively connected; the limiting force transmission ring is arranged at a certain distance below the upper opening of the grouting steel pipe section, pressure can be transmitted in the pile pressing process so that the grouting steel pipe section can be pressed to the designed elevation, and the single-pile bearing capacity of the composite pipe pile is improved by arranging the geotextile bag on the grouting steel pipe section. The problem that a conventional tubular pile construction process cannot be implemented under the conditions that the site condition is narrow, the bearing capacity of foundation soil is low and important protection structures exist nearby can be solved, meanwhile, the single-pile bearing capacity of the tubular pile is effectively improved, the working efficiency of pile foundation construction is improved, and the construction cost is reduced. The application range of the pipe pile is widened (the pipe pile can be used in narrow sites), the influence on the surrounding environment is small, and the comprehensive effect is remarkable.

Description

Technical Field

[0001] The present invention relates to the technical field of civil engineering. Specifically, it is a composite pipe pile applicable to narrow sites and a construction method therefor. Background Art

[0002] Currently, the main pile foundation forms used for engineering piles are pipe piles and cast-in-place piles. From the perspectives of economy, environmental protection, and the construction period of pile foundations, the cost performance of pipe piles is higher. Generally, the main construction equipment for pipe piles is a static pile press. This equipment is large in size, heavy in self-weight, and slow in pile position movement. Therefore, it has very high requirements for site conditions. Generally, the site conditions for pipe pile construction are as follows: the site is open, there are no important protected buildings or structures around, and the bearing capacity of the foundation soil itself is good enough to bear the load of the upper mechanical equipment. However, for some construction sites with narrow conditions and important protected buildings or structures nearby, the construction process of pressing pipe piles using a static pile press equipment cannot be effectively implemented. Summary of the Invention

[0003] The purpose of the present invention is to provide a composite pipe pile applicable to narrow sites and a construction method therefor. This pipe pile can achieve effective pipe pile sinking without using a static pile driver under the conditions of narrow site, low bearing capacity of foundation soil, and important protected buildings or structures nearby, and can significantly improve the single-pile bearing capacity of the pipe pile.

[0004] The purpose of the present invention is achieved as follows: A composite pipe pile applicable to narrow sites, comprising:

[0005] A grouting steel pipe section, which is connected with a geotextile bag on the outside and is provided with a number of grouting holes communicating with the inner cavity of the geotextile bag. In the grouting state, the geotextile bag forms an expanded structure body;

[0006] A limit force transmission structure body, which is fixedly connected to the outer side wall of the grouting steel pipe section;

[0007] A precast pipe pile body located above the grouting steel pipe section, the precast pipe pile body contacts the limit force transmission structure body with a downward pressure, and the grouting steel pipe section is inserted into the inner cavity of the precast pipe pile body;

[0008] Wherein, a number of gravels are filled in both the inner cavity of the precast pipe pile body and the inner cavity of the grouting steel pipe section. After grouting, the precast pipe pile body and the grouting steel pipe section are fixedly connected into a whole.

[0009] Further, the limit force transmission structure body includes an annular limit force transmission ring, and the limit force transmission ring surrounds and is fixedly connected to the outer side wall of the grouting steel pipe section.

[0010] Further, the limit force transmission ring is provided with a strengthening part for strengthening its rigidity, and the strengthening part is fixedly connected to the limit force transmission ring and the outer side wall of the grouting steel pipe section.

[0011] Further, the lower end of the precast pipe pile body is fitted with the limit force transmission ring.

[0012] Further, it further includes an air outlet pipe that can be opened and closed. The air outlet pipe is inserted into the inner cavity of the precast pipe pile body from the upper port of the precast pipe pile body, and the upper end of the air outlet pipe exposes from the upper port of the precast pipe pile body.

[0013] Further, it further includes a grouting pipe for grouting. The grouting pipe is inserted into the inner cavity of the precast pipe pile body and the inner cavity of the grouting steel pipe section from the upper port of the precast pipe pile body, and the lower end of the grouting pipe communicates with the inner cavity of the geotextile bag through a grouting hole.

[0014] Further, an openable and closable cover is installed at the upper end of the air outlet pipe.

[0015] As another aspect of the present invention, a construction method is proposed, including the following steps:

[0016] S1. Arrange a number of grouting holes in a grid pattern on the upper part of the grouting steel pipe section, and then tie a geotextile bag on the outer wall of the grouting steel pipe section;

[0017] S2. Weld the limit force transmission ring on both sides at a certain distance from the grouting steel pipe section. At the same time, weld a strengthening part on both sides at the junction of the limit force transmission ring and the grouting steel pipe section, and fix the limit force transmission ring on the outer side wall of the grouting steel pipe section;

[0018] S3. After processing the above-mentioned grouting steel pipe section, use a manipulator to press it into the pile position measured and lofted. Stop when it is pressed until the limit force transmission ring is flush with the ground;

[0019] S4. Use a manipulator to grab the precast pipe pile body and align it with the pipe orifice of the grouting steel pipe section, and then lower the precast pipe pile body so that the grouting steel pipe section is inserted into the precast pipe pile body, and the limit force transmission ring supports the lower end of the precast pipe pile body;

[0020] S5. After effective contact is formed between the bottom of the precast pipe pile body and the top of the grouting steel pipe section, use the manipulator to provide the pile pressing power to press the composite pipe pile to the design elevation;

[0021] S6. When the composite pipe pile is pressed to the design elevation, arrange a grouting pipe and an air outlet pipe at the upper opening of the composite pipe pile. Insert the air outlet pipe into the inner cavity of the precast pipe pile body, set a cover at the orifice of the air outlet pipe, and the grouting pipe passes through the precast pipe pile body and enters the middle and lower part of the grouting steel pipe section; weld a sealing steel plate at the top of the precast pipe pile body for sealing to ensure that the slurry does not flow out during grouting;

[0022] S7. After the grouting pipe and the air outlet pipe are inserted in place, fill the inner cavities of the precast pipe pile body and the grouting steel pipe section with a number of crushed stones;

[0023] S8. Next, grouting is carried out using a grouting pipe. Before formal grouting, grouting is carried out with a relatively small grouting pressure to expel the air in the pipe. After the cement slurry emerges from the air outlet pipe, the cover is covered; then formal grouting is carried out, and the composite pipe pile is grouted through the grouting pipe. Under the pressure of the slurry, the geotextile bag is in an expanded state.

[0024] The beneficial effects of the present invention are as follows:

[0025] The present invention can solve the problem that the conventional pipe pile construction process cannot be implemented under the conditions of narrow site, low bearing capacity of foundation soil and important protected structures nearby. At the same time, it can effectively improve the single pile bearing capacity of the pipe pile. This component improves the working efficiency of pile foundation construction, expands the applicable range of pipe piles (can be used in narrow sites), has little impact on the surrounding environment, and has remarkable comprehensive effects. Brief Description of the Drawings

[0026] Figure 1 It is a structural schematic diagram of the present invention.

[0027] Description of the reference numerals in the drawings: 1 - cover; 2 - air outlet pipe; 3 - grouting pipe; 4 - gravel; 5 - precast pipe pile body; 6 - cement slurry; 7 - lower pipe orifice; 8 - pipe pile embedded section; 9 - limit force transmission ring; 10 - grouting steel pipe section; 11 - geotextile bag; 12 - grouting hole; 13 - strengthening part. Detailed Embodiment

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. Figure 1

[0029] Figure 1 As shown, a composite pipe pile applicable to a narrow site is proposed, including:

[0030] A grouting steel pipe section 10, on the outer side of which a geotextile bag 11 is connected, and a number of grouting holes 12 communicating with the inner cavity of the geotextile bag 11 are provided. In the grouting state, the geotextile bag 11 forms an expanded structure body;

[0031] A limit force transmission structure body, which is fixedly connected to the outer side wall of the grouting steel pipe section 10. The limit force transmission structure body includes an annular limit force transmission ring 9. The limit force transmission ring 9 surrounds and is fixedly connected to the outer side wall of the grouting steel pipe section 10. The limit force transmission ring 9 is provided with a strengthening part 13 for strengthening its rigidity. The strengthening part 13 is fixedly connected to the limit force transmission ring 9 and the outer side wall of the grouting steel pipe section 10;

[0032] The precast pipe pile body 5 above the grouting steel pipe section 10, the precast pipe pile body 5 presses downward to contact the limit force transmission structure body, the grouting steel pipe section 10 is inserted into the inner cavity of the precast pipe pile body 5, and the lower end of the precast pipe pile body 5 fits with the limit force transmission ring 9;

[0033] The air outlet pipe 2 that can be opened and closed, the air outlet pipe 2 is inserted into the inner cavity of the precast pipe pile body 5 from the upper port of the precast pipe pile body 5, the upper end of the air outlet pipe 2 exposes from the upper port of the precast pipe pile body 5, and a closable cover 1 is installed at the upper end of the air outlet pipe 2;

[0034] The grouting pipe 3 for grouting, the grouting pipe 3 is inserted into the inner cavity of the precast pipe pile body 5 and the inner cavity of the grouting steel pipe section 10 from the upper port of the precast pipe pile body 5, and the lower end of the grouting pipe 3 is communicated with the inner cavity of the geotextile bag 11 through the grouting hole 12;

[0035] Among them, the inner cavities of the precast pipe pile body 5 and the grouting steel pipe section 10 are both filled with a number of gravels 4. After grouting, the precast pipe pile body 5 and the grouting steel pipe section 10 are fixedly connected as a whole, which is the composite pipe pile component.

[0036] Based on the above structural scheme of the composite pipe pile, the preferred construction method is as follows:

[0037] S1. Arrange a number of grouting holes 12 on the grouting steel pipe section 10 in a grid pattern, and then tie the geotextile bag 11 on the outer wall of the grouting steel pipe section 10;

[0038] S2. Double-sided weld the limit force transmission ring 9 (including the strengthening part 13) at a position a certain distance (not less than 2m) from the grouting steel pipe section 10. At the same time, double-sided weld the strengthening part 13 (the size should be not less than 50mm×50mm×5mm triangular steel plate) at the joint of the limit force transmission ring 9 and the grouting steel pipe section 10, and fix the limit force transmission ring 9 on the outer side wall of the grouting steel pipe section 10;

[0039] S3. After the above grouting steel pipe section 10 is processed, use a manipulator to press it into the pile position measured and lofted. Stop when it is pressed until the limit force transmission ring 9 is flush with the ground;

[0040] S4. Use a manipulator to grab the precast pipe pile body 5 and align it with the pipe orifice of the grouting steel pipe section 10, and then lower the precast pipe pile body 5 so that the grouting steel pipe section 10 is inserted into the precast pipe pile body 5, thus forming a pipe pile embedded section 8 (the part of the grouting steel pipe section 10 inserted into the precast pipe pile body 5). The limit force transmission ring 9 supports the lower end of the precast pipe pile body 5 so that the precast pipe pile body 5 and the grouting steel pipe section 10 can be formed into a whole through the grouting body later;

[0041] S5. After effective contact is formed at the bottom of the precast pipe pile body 5 and the top of the grouting steel pipe section 10, use a manipulator to provide the pile pressing power to press the composite pipe pile to the design elevation;

[0042] S6. After the composite pipe pile is pressed to the design elevation, place the grouting pipe 3 and the air outlet pipe 2 (including the lower pipe orifice 7) on the upper opening of the composite pipe pile. Insert the air outlet pipe 2 into the inner cavity of the precast pipe pile body 5, and set a sealing cover 1 at the orifice of the air outlet pipe 2 (the sealing cover should be set to be detachable). The grouting pipe 3 should pass through the precast pipe pile body 5 and enter the middle and lower part of the grouting steel pipe section 11. Weld a sealing steel plate (the thickness of the sealing plate is not less than 6 mm) on the top of the precast pipe pile body 5 for sealing to ensure that the slurry does not flow out during grouting.

[0043] S7. After the grouting pipe 3 and the air outlet pipe 2 are inserted in place, pour a number of crushed stones 4 (the particle size of the crushed stones should not be greater than 3 cm) into the hollow part of the composite pipe pile, that is, a number of crushed stones 4 fill the inner cavity of the precast pipe pile body 5 and the inner cavity of the grouting steel pipe section 10.

[0044] S8. Next, use the grouting pipe 3 for grouting. Before formal grouting, grout with a relatively small grouting pressure (not exceeding 0.5 MPa) to discharge the air in the steel pipe. After the cement slurry emerges from the air outlet pipe 2, cover the sealing cover 1. Then carry out formal grouting, grout the composite pipe pile through the grouting pipe 3 (the grouting pressure should be controlled at 1 - 2.5 MPa). During grouting, it should be injected at intervals and multiple times. Under the action of the slurry pressure, the geotextile bag 11 can be effectively expanded.

[0045] From the content of the above structure and method, it can be seen that the technical problems to be solved by this solution are:

[0046] 1. Under the conditions of narrow site, low bearing capacity of foundation soil and the existence of important protected buildings nearby, the use of a manipulator can effectively drive the pipe pile.

[0047] 2. Use crushed stone grouting to fill the inside of the precast pipe pile body 5 and the grouting steel pipe section 10 to effectively connect the end of the precast pipe pile body 5 and the grouting steel pipe section 10.

[0048] 3. Set a limit force - transmitting ring 9 at a certain distance below the upper orifice of the grouting steel pipe section 10, which can transmit pressure during the pile - driving process to press the grouting steel pipe section 10 to the design elevation.

[0049] 4. By setting a geotextile bag 11 in the grouting steel pipe section 10, the single - pile bearing capacity of the composite pipe pile can be improved.

[0050] The technical solutions and key points adopted by this solution to solve the technical problems are as follows:

[0051] 1. The main purpose of setting this composite pipe pile is to solve the problem that the conventional pipe - pile construction technology cannot be implemented under the conditions of narrow site, low bearing capacity of foundation soil and the existence of important protected buildings nearby, and at the same time effectively improve the single - pile bearing capacity of the pipe pile.

[0052] 2. The composite pipe pile component mainly solves the problem of mutual force transmission between the pipe pile and the grouting steel pipe by setting a limit force transmission ring 9 on the grouting steel pipe. When pressing the pile, a manipulator is used to press the prefabricated pipe pile body 5, and the prefabricated pipe pile body 5 transmits force downward through the limit force transmission ring 9 to press the grouting steel pipe section 10, thereby pressing the grouting steel pipe section 10 to the designed elevation;

[0053] 3. After the upper prefabricated pipe pile body 5 is pressed to the designed elevation, the grouting pipe 3 is lowered to the middle and upper part of the grouting steel pipe section 10, and a geotextile bag 11 is arranged outside the grouting steel pipe section 10 to control the uniform infiltration of the slurry;

[0054] 4. Before grouting, pour crushed stone 4 into the prefabricated pipe pile body 5 and the grouting steel pipe section 10. After grouting, the prefabricated pipe pile body 5 and the grouting steel pipe section 10 are effectively anchored by the crushed stone 4 to form a composite pipe pile;

[0055] 5. Double-sided welding is performed on the limit force transmission ring 9 and the grouting steel pipe section 10, and a reinforcement part 13 is arranged between the two to ensure that the limit force transmission ring 9 and the grouting steel pipe section 10 are effectively connected; at the same time, the axial rigidity of the limit force transmission ring 9 is improved to prevent the limit force transmission ring 9 from being deformed when the pipe pile is pressed;

[0056] 6. Low-pressure grouting should be used for the initial grouting, and the cover 1 of the air outlet pipe 2 should be opened at the same time to ensure that the air in the composite pipe pile is effectively discharged; when the slurry overflows from the air outlet pipe 2, the air outlet pipe 2 is sealed with the cover 1, and then the grouting pressure is increased to ensure that the slurry expands the geotextile bag 11 to increase the effective area of ​​the composite pile side and the pile end.

[0057] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention; in the present invention, it should also be noted that the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, an integrally formed connection, a mechanical connection, or an indirect connection through an intermediate connecting component, and the specific meaning of the terms in this utility model can be understood according to the specific circumstances.

[0058] It is apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, in all respects, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Accordingly, all changes that fall within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention, and any reference signs in the claims should not be construed as limiting the claims involved.

[0059] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in the various embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A composite pipe pile suitable for narrow sites, characterized in that: include: A grouting steel pipe section (10) is connected to a geotextile bag (11) on its outer side and is provided with a plurality of grouting holes (12) communicating with the inner cavity of the geotextile bag (11). In the grouting state, the geotextile bag (11) forms an expansion structure; A position-limiting force-transmitting structure, which is fixedly connected to the outer side wall of the grouting steel pipe section (10); A prefabricated pipe pile body (5) is located on the grouting steel pipe section (10), wherein the prefabricated pipe pile body (5) contacts the limit force transmission structure with downward pressure, and the grouting steel pipe section (10) is inserted into the inner cavity of the prefabricated pipe pile body (5); The inner cavity of the prefabricated pipe pile body (5) and the inner cavity of the grouting steel pipe section (10) are both filled with a plurality of crushed stones (4), and after grouting, the prefabricated pipe pile body (5) and the grouting steel pipe section (10) are fixedly connected to form a whole.

2. The composite pipe pile suitable for narrow sites according to claim 1, characterized in that: The position-limiting force-transmitting structure comprises an annular position-limiting force-transmitting ring (9), and the position-limiting force-transmitting ring (9) surrounds and is fixedly connected to the outer side wall of the grouting steel pipe section (10).

3. The composite pipe pile suitable for narrow sites according to claim 2, characterized in that: The limit force transmission ring (9) is provided with a reinforcing portion (13) for enhancing its rigidity, and the reinforcing portion (13) is fixedly connected to the limit force transmission ring (9) and the outer side wall of the grouting steel pipe section (10).

4. The composite pipe pile suitable for narrow sites according to claim 2, characterized in that: The lower end of the prefabricated pipe pile body (5) is matched with the limiting force transmission ring (9).

5. The composite pipe pile suitable for narrow sites according to claim 2, characterized in that: It also comprises an air outlet pipe (2) which can be opened and closed. The air outlet pipe (2) is inserted into the inner cavity of the prefabricated pipe pile body (5) from the upper end of the prefabricated pipe pile body (5), and the upper end of the air outlet pipe (2) is exposed from the upper end of the prefabricated pipe pile body (5).

6. The composite pipe pile suitable for narrow sites according to claim 5, characterized in that: It also includes a grouting pipe (3) for grouting, wherein the grouting pipe (3) is inserted from the upper end of the prefabricated pipe pile body (5) into the inner cavity of the prefabricated pipe pile body (5) and the inner cavity of the grouting steel pipe section (10), and the lower end of the grouting pipe (3) is connected to the inner cavity of the geotextile bag (11) through a grouting hole (12).

7. The composite pipe pile suitable for narrow sites according to claim 6, characterized in that: The upper end of the air outlet pipe (2) is provided with an openable and closable sealing cover (1).

8. A construction method based on the composite pipe piles suitable for narrow sites according to claim 7, characterized in that: The steps include: S1, arranging a plurality of grouting holes (12) in a grid pattern on the grouting steel pipe section (10), and then tying a geotextile bag (11) on the outer wall of the grouting steel pipe section (10); S2, double-sided welding of a limit force transmission ring (9) at a certain distance from the grouting steel pipe section (10), and fixing the limit force transmission ring (9) on the outer side wall of the grouting steel pipe section (10); S3, after the grouting steel pipe section (10) is processed, it is pressed into the measured pile position by a manipulator, and the pressing is stopped after the limit force transmission ring (9) is flush with the ground; S4, using a manipulator to grab the prefabricated pipe pile body (5) and align it with the pipe mouth of the grouting steel pipe section (10), and then lowering the prefabricated pipe pile body (5) so that the grouting steel pipe section (10) is inserted into the prefabricated pipe pile body (5), and the limiting force transmission ring (9) supports the lower end of the prefabricated pipe pile body (5); S5, after the bottom of the prefabricated pipe pile body (5) and the top of the grouting steel pipe section (10) form effective contact, the composite pipe pile is pressed into the designed elevation by providing pile-pressing power through a manipulator; S6. After the composite pipe pile is pressed into the designed elevation, a grouting pipe (3) and an air outlet pipe (2) are arranged at the upper end of the composite pipe pile, the air outlet pipe (2) is inserted into the inner cavity of the prefabricated pipe pile body (5), a sealing cover (1) is arranged at the pipe opening of the air outlet pipe (2), and the grouting pipe (3) passes through the prefabricated pipe pile body (5) and enters the middle and lower part of the grouting steel pipe section (11); S7, after the grouting pipe (3) and the air outlet pipe (2) are inserted in place, a number of crushed stones (4) are filled into the inner cavity of the prefabricated pipe pile body (5) and the inner cavity of the grouting steel pipe section (10); S8. Next, grouting is performed using a grouting pipe (3). Before the formal grouting, grouting is performed at a relatively low grouting pressure to expel the air in the pipe. After the cement slurry emerges from the air outlet pipe (2), the cover (1) is closed. Then, formal grouting is performed, and grouting is performed on the composite pipe pile through the grouting pipe (3). Under the pressure of the slurry, the geotextile bag (11) is in an expanded state.

9. A construction method according to claim 8, characterized in that: In step S6, a sealing steel plate is welded on the top of the prefabricated pipe pile body (5) to seal it, so as to ensure that the slurry does not flow out during grouting.

10. A construction method according to claim 8, characterized in that: In step S2, a reinforcement part (13) is welded on both sides at the junction of the limiting force transmission ring (9) and the grouting steel pipe section (10).

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