Prefabricated retaining wall for manually dug pile and its construction method

Abstract

The present invention provides a precast retaining wall for manually dug piles and a construction method thereof. The retaining wall includes at least three precast retaining wall segments that can be spliced to form a closed ring. The arc length of the precast retaining wall segment is less than half of the circumference of the ring where the precast retaining wall segment is located. At least one precast retaining wall segment is provided with a backfill opening, and the backfill opening is arranged at a position close to the top of the precast retaining wall segment. By splicing the precast retaining wall segments on site in the present invention, the problems of long construction period, high cost and difficult safety guarantee caused by traditional on-site casting are effectively avoided; by prefabricating the retaining wall in advance, only excavation, installation and fixation of the retaining wall are required in the hole, and continuous excavation can be carried out without waiting for the concrete to gain strength, effectively improving the efficiency of pile digging; the batch prefabrication of the retaining wall ensures stable quality and reduces the labor and material costs to a certain extent; the retaining wall can be quickly installed after the excavation is formed, effectively improving the working efficiency of the retaining wall construction in the hole, reducing the risk of hole wall collapse and ensuring the construction safety.

Description

Technical Field

[0001] The present invention relates to the technical field of bored pile retaining wall construction, and particularly to a precast retaining wall for manually excavated piles and a construction method thereof. Background Art

[0002] In the field of construction engineering, bored piles are usually constructed by manual excavation of soil and on-site casting of reinforced concrete piles. The manually excavated holes are circular, generally with a relatively large diameter, and can bear a certain pressure of the main structure, so they are widely used. A bearing platform is arranged on the pile, and then the bearing platforms are tied and connected by bearing platform beams, so that the forces of each pile are evenly distributed to support the entire building. During the process of manual excavation, a layer of retaining wall is built on the hole wall. This retaining wall is a concrete structure, which plays a role in supporting and stabilizing the hole wall and further ensures construction safety.

[0003] The traditional method for building the retaining wall is to manually dig a circular hole. After each hole depth of about 1 m, steel bars are tied, then formwork is supported, and then concrete is slowly poured. After at least 1 day when the concrete has a certain strength, a layer of retaining wall is formed. Then, the hole is manually excavated about 1 m deep, steel bars are tied, formwork is supported, and then concrete is slowly poured, and so on. The next section is constructed after the previous section is completed, which seriously affects the construction progress and reduces the construction efficiency. At the same time, when the traditional retaining wall is built by on-site casting of concrete, the concrete of the lower section needs to be poured from the feeding port. If the feeding port is too small, construction is inconvenient; if the feeding port is too large, the excavation of the hole increases, and thus the retaining wall also increases, resulting in an increase in workload and construction cost.

[0004] Therefore, the traditional method of on-site casting the retaining wall has the following disadvantages:

[0005] (1) Long construction period: It takes time to transport the steel bars into the hole and tie them, pour the concrete, and wait for the concrete to gain strength, resulting in a reduction in construction efficiency.

[0006] (2) Difficult to guarantee quality: Working manually in a limited space, the amount of materials used each time is small, and large-scale production cannot be carried out, resulting in large fluctuations in quality.

[0007] (3) High cost: Manual operations in a limited space and small material usage result in high labor costs and material costs.

[0008] (4) Safety risks: A safety support cannot be quickly formed, and there is always a risk of collapse. Summary of the Invention

[0009] The present invention provides a precast retaining wall for manually excavated piles and a construction method thereof, so as to solve the defects of long construction period, difficult quality guarantee, high construction cost, and potential safety hazards caused by on-site casting of the retaining wall in the prior art, and achieve high-efficiency and high-quality construction of the retaining wall for manually excavated piles.

[0010] On the one hand, the present invention provides a precast retaining wall for manual dug piles, which includes at least three precast retaining wall segments that can be spliced to form a closed ring. The arc length of the precast retaining wall segment is less than half of the circumference of the ring where the precast retaining wall segment is located. At least one of the precast retaining wall segments is provided with a backfill opening, and the backfill opening is arranged at a position close to the top of the precast retaining wall segment.

[0011] According to the precast retaining wall for manual dug piles provided by the present invention, the precast retaining wall segments include a first precast retaining wall segment, a second precast retaining wall segment, and a third precast retaining wall segment. The arc length of the first precast retaining wall segment is less than the arc lengths of the second precast retaining wall segment and the third precast retaining wall segment, and the backfill opening is arranged on the first precast retaining wall segment.

[0012] According to the precast retaining wall for manual dug piles provided by the present invention, limiting plates are provided at the splicing joints between the first precast retaining wall segment and the second precast retaining wall segment, and between the first precast retaining wall segment and the third precast retaining wall segment.

[0013] According to the precast retaining wall for manual dug piles provided by the present invention, the limiting plate is in an arc shape, and the limiting plate is detachably arranged on the outer arc surface of the first precast retaining wall segment.

[0014] According to the precast retaining wall for manual dug piles provided by the present invention, fixing holes are provided on the surface of the precast retaining wall segment for fixing with the hole wall through fixing bolts.

[0015] On the other hand, the present invention also provides a construction method for a precast retaining wall for manual dug piles, including:

[0016] Precasting multiple precast retaining wall segments that can be spliced to form a closed ring; wherein, at least three precast retaining wall segments are provided, the arc length of the precast retaining wall segment is less than half of the circumference of the ring where the precast retaining wall segment is located, and at least one of the precast retaining wall segments is provided with a backfill opening;

[0017] Excavating a carry cavity on the side wall of the round hole, and the length of the carry cavity is not less than the arc length of the precast retaining wall segment provided with the backfill opening;

[0018] Placing the precast retaining wall segments into the round hole, and placing the precast retaining wall segment provided with the backfill opening into the carry cavity;

[0019] Splicing multiple precast retaining wall segments to form a closed retaining wall ring;

[0020] Backfilling the carry cavity;

[0021] Fixing the precast retaining wall segments.

[0022] According to the construction method for a precast retaining wall for manual dug piles provided by the present invention, the step of precasting multiple precast retaining wall segments that can be spliced to form a closed ring includes:

[0023] The first precast retaining wall segment, the second precast retaining wall segment and the third precast retaining wall segment that can be prefabricated and spliced to form a closed ring, the arc length of the first precast retaining wall segment is less than the arc lengths of the second precast retaining wall segment and the third precast retaining wall segment, and a backfill port is arranged at a position near the top of the first precast retaining wall segment.

[0024] According to the construction method of the precast retaining wall for the manually dug pile provided by the present invention, the step of splicing multiple segments of the precast retaining wall segments includes:

[0025] Splice the precast retaining wall segments without the backfill port along the inner wall of the circular hole in sequence, so that the notch of the retaining wall ring is facing the carry cavity, and splice the precast retaining wall segment with the backfill port into the retaining wall ring notch from the carry cavity to form a closed retaining wall ring.

[0026] According to the construction method of the precast retaining wall for the manually dug pile provided by the present invention, the step of backfilling the carry cavity includes:

[0027] Fill the carry cavity from the backfill port and fill the carry cavity completely.

[0028] According to the construction method of the precast retaining wall for the manually dug pile provided by the present invention, the step of fixing the precast retaining wall segments includes:

[0029] Set fixing bolts in the fixing holes on the surface of the precast retaining wall segment and fix the precast retaining wall segment on the inner wall of the circular hole.

[0030] The precast retaining wall for the manually dug pile and its construction method provided by the present invention, by setting at least three precast retaining wall segments that can be spliced to form a closed ring, the arc length of the precast retaining wall segment is less than half of the circumference of the ring where the precast retaining wall segment is located, and a backfill port is opened on one of the precast retaining wall segments, and the backfill port is arranged at a position near the top of the precast retaining wall segment. During construction, a carry cavity is excavated on the side wall of the circular hole, the precast retaining wall segments are placed in the circular hole, and the precast retaining wall segment with the backfill port is placed in the carry cavity. Multiple precast retaining wall segments are spliced to form a closed retaining wall ring, the carry cavity is backfilled, and then the precast retaining wall segments are fixed, so that the circular hole retaining wall can be quickly formed. By prefabricating the precast retaining wall segments in advance and splicing them on site, it effectively avoids the problems of long construction period, high cost and difficult safety guarantee caused by traditional on-site casting; by prefabricating the retaining wall in advance, only the soil needs to be excavated in the hole, the retaining wall is installed and fixed, and continuous excavation can be carried out without waiting for the concrete to gain strength, effectively improving the efficiency of digging the hole; the batch prefabrication of the retaining wall ensures stable quality, and to a certain extent reduces the labor and material costs; the retaining wall is installed immediately after the excavation is formed, reducing the risk of hole wall collapse and ensuring the safety of construction. Description of the Drawings

[0031] To more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0032] Figure 1 It is the top view of the precast retaining wall of the manually dug pile provided by the present invention;

[0033] Figure 2 It is the schematic structural diagram of the first precast retaining wall section of the precast retaining wall of the manually dug pile provided by the present invention;

[0034] Figure 3 It is the top view of the construction process of the precast retaining wall of the manually dug pile provided by the present invention;

[0035] Figure 4 It is the schematic cross-sectional structural diagram after the installation of the precast retaining wall of the manually dug pile provided by the present invention;

[0036] Figure 5 It is the step flow chart of the construction method of the precast retaining wall of the manually dug pile provided by the present invention;

[0037] Reference numerals:

[0038] 1: The first precast retaining wall section; 11: The first fixing hole; 12: The second fixing hole;

[0039] 13: The backfill port; 2: The second precast retaining wall section; 3: The third precast retaining wall section;

[0040] 4: The limiting plate; 41: The third fixing hole; 5: The round hole;

[0041] 6: The carry cavity; 7: The first fixing bolt; 8: The second fixing bolt;

[0042] 9: The foundation. Detailed implementation manners

[0043] To make the purpose, technical solutions and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the present invention in conjunction with the drawings in the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0044] Such as Figures 1-4As shown in the figure, an embodiment of the present invention provides a precast retaining wall for manually dug piles. The retaining wall includes multiple precast retaining wall segments that can be spliced to form a closed ring, which is used to replace the retaining wall cast on-site on the hole wall. These multiple precast retaining wall segments can be pre-produced in a factory and then transported to the construction site. The multiple precast retaining wall segments are directly placed into the hole for splicing, realizing the rapid construction of the retaining wall inside the hole.

[0045] Specifically, in the embodiment of the present invention, the precast retaining wall segments are set to three segments, namely the first precast retaining wall segment 1, the second precast retaining wall segment 2, and the third precast retaining wall segment 3. The first precast retaining wall segment 1, the second precast retaining wall segment 2, and the third precast retaining wall segment 3 are in an arc shape and have the same radian, so that the first precast retaining wall segment 1, the second precast retaining wall segment 2, and the third precast retaining wall segment 3 can be spliced into a complete circle. This circular retaining wall fits on the inner wall of the circular hole 5 and effectively supports the inner wall of the circular hole 5.

[0046] It should be noted that in this embodiment, the arc length of the precast retaining wall segment must be less than half of the circumference of the ring where the precast retaining wall segment is located, that is, the arc length of any one of the first precast retaining wall segment 1, the second precast retaining wall segment 2, and the third precast retaining wall segment 3 cannot exceed the semi-circular circumference of the circular hole 5. This is to ensure that the first precast retaining wall segment 1, the second precast retaining wall segment 2, and the third precast retaining wall segment 3 can be placed into the circular hole 5. Because during the construction of the retaining wall for manually dug piles, the hole is first dug downwards. When it reaches a certain depth, the retaining wall must be built. After the construction of the retaining wall for this layer is completed, the hole is continued to be dug downwards, and then the retaining wall support for the lower hole wall is built, and the construction is carried out layer by layer. In the embodiment of the present invention, since the retaining wall is precast in segments, if the arc length of any one of the first precast retaining wall segment 1, the second precast retaining wall segment 2, and the third precast retaining wall segment 3 is greater than or equal to the semi-circular circumference of the circular hole 5 after the construction of the upper retaining wall is completed, it will cause the precast retaining wall segment to be unable to pass through the upper retaining wall and enter the lower circular hole 5, and thus the splicing-type retaining wall scheme of the present invention cannot be realized, resulting in the inability to construct.

[0047] During construction, a circular hole 5 is excavated on the foundation 9. Generally, the circular hole 5 is dug to a depth of about 1 meter, and the hole wall is trimmed. Then, a certain width is dug out in one direction on the inner wall of the circular hole 5, that is, a carry cavity 6 is dug on the inner wall of the circular hole 5. The length of the carry cavity 6 is not less than the arc length of the first precast retaining wall segment 1, so that the first precast retaining wall segment 1 can be placed in the carry cavity 6. Subsequently, the first precast retaining wall segment 1, the second precast retaining wall segment 2, and the third precast retaining wall segment 3 are placed in the circular hole 5, and the first precast retaining wall segment 1 is placed in the carry cavity 6.

[0048] When installing the retaining wall, first, splice the second precast retaining wall segment 2 and the third precast retaining wall segment 3, and fit them to the inner wall of the circular hole 5. Align the notch of the circular retaining wall formed by splicing the second precast retaining wall segment 2 and the third precast retaining wall segment 3 towards the feeding cavity 6. Then, insert the first precast retaining wall segment 1 into the notch of the circular retaining wall from the feeding cavity 6, so that the first precast retaining wall segment 1, the second precast retaining wall segment 2, and the third precast retaining wall segment 3 form a complete and closed circular ring.

[0049] The feeding cavity 6 is provided because the multi-segment precast retaining wall segments are affected by the thickness dimension of the retaining wall (the outer wall is longer than the inner wall), making it impossible to splice the outer walls into a circular ring in the circular hole 5. This is also a feature in the construction steps of the present invention. In combination with the multi-segment precast retaining wall segments, effective splicing of the precast retaining wall segments is achieved.

[0050] It is worth mentioning that in the embodiment of the present invention, the arc length of the first precast retaining wall segment 1 is the smallest, and the second precast retaining wall segment 2 and the third precast retaining wall segment 3 can be set to have the same arc length. In this way, the degree of the feeding cavity 6 can be minimized, reducing the excavation work and facilitating the splicing work in the last step, further improving the construction efficiency.

[0051] In the embodiment of the present invention, at least one precast retaining wall segment is provided with a backfill port 13, and the backfill port 13 is arranged at a position close to the top of the precast retaining wall segment. As Figure 2 shown, a backfill port 13 is provided on the first precast retaining wall segment 1. Therefore, the first precast retaining wall segment 1 is used as the last precast retaining wall segment to be spliced to complete the splicing of the entire circular retaining wall.

[0052] In this embodiment, a plurality of fixing holes 11 are provided on the surfaces of the first precast retaining wall segment 1, the second precast retaining wall segment 2, and the third precast retaining wall segment 3. The precast retaining wall segments can be fixed in the circular hole 5 by passing the first fixing bolt 7 through the fixing holes 11.

[0053] After the first precast retaining wall segment 1, the second precast retaining wall segment 2, and the third precast retaining wall segment 3 are spliced into a complete and closed circular retaining wall, backfill stone aggregate, etc. into the feeding cavity 6 from the backfill port 13 to support the first precast retaining wall segment 1 from the outside to prevent the first precast retaining wall segment 1 from moving backward. Subsequently, fix the first precast retaining wall segment 1 on the stone aggregate backfilled in the feeding cavity 6 by passing the first fixing bolt 7 through the fixing holes 11.

[0054] Furthermore, in this embodiment, a limiting plate 4 is provided at the splicing joint between the first precast retaining wall segment 1 and the second precast retaining wall segment 2, and at the splicing joint between the first precast retaining wall segment 1 and the third precast retaining wall segment 3. A second fixing hole 12 is provided at the position of the first precast retaining wall segment 1 corresponding to the limiting plate 4. At the same time, a third fixing hole 41 is provided on the limiting plate 4. The first precast retaining wall segment 1 and the limiting plate 4 are fixed by passing a second fixing bolt 8 through the second fixing hole 12 and the third fixing hole 41. Of course, corresponding fixing holes and fixing bolts can also be provided on the second precast retaining wall segment 2 and the third precast retaining wall segment 3 for fixed connection with the limiting plate 4.

[0055] Specifically, the limiting plate 4 is arc-shaped and is arranged on the outer arc surface of the first precast retaining wall segment 1. Since the limiting plate 4 extends outwards on both sides, it effectively supports the second precast retaining wall segment 2 and the third precast retaining wall segment 3 on both sides of the first precast retaining wall segment 1, preventing relative displacement of the first precast retaining wall segment 1, the second precast retaining wall segment 2, and the third precast retaining wall segment 3.

[0056] The embodiment of the present invention also provides a construction method for precast retaining walls of manually dug piles. The method specifically includes the following steps:

[0057] Step 1: First, precast multiple precast retaining wall segments that can be spliced into a closed ring.

[0058] Among them, at least three precast retaining wall segments are provided. In this embodiment, three segments are provided, namely the first precast retaining wall segment 1, the second precast retaining wall segment 2, and the third precast retaining wall segment 3. It should be noted that the arc length of the precast retaining wall segment is less than half of the circumference of the ring where the precast retaining wall segment is located. Therefore, the arc lengths of the first precast retaining wall segment 1, the second precast retaining wall segment 2, and the third precast retaining wall segment 3 are all less than half of the circumference of the circular hole 5.

[0059] At the same time, a backfill port 13 is also provided on the first precast retaining wall segment 1; the first precast retaining wall segment 1, the second precast retaining wall segment 2, and the third precast retaining wall segment 3 are all prefabricated and formed in the factory in advance. During use, they can be directly transported to the construction site.

[0060] Step 2: While excavating the circular hole 5, a carry-in cavity 6 is excavated on the side wall of the circular hole 5. The length of the carry-in cavity 6 is not less than the arc length of the precast retaining wall segment provided with the backfill port; that is, the length of the carry-in cavity 6 is not less than the arc length of the first precast retaining wall segment 1, ensuring that the first precast retaining wall segment 1 can be placed in the carry-in cavity 6.

[0061] Step 3: Hoist the first precast retaining wall segment 1, the second precast retaining wall segment 2, and the third precast retaining wall segment 3 into the circular hole 5. At the same time, place the first precast retaining wall segment 1 into the carry-in cavity 6.

[0062] Step 4: Splice the first precast retaining wall segment 1, the second precast retaining wall segment 2, and the third precast retaining wall segment 3 to form a closed retaining wall ring.

[0063] In this step, first, the second precast retaining wall segment 2 and the third precast retaining wall segment 3 are sequentially spliced along the inner wall of the circular hole 5, so that the notch of the retaining wall ring faces the carry cavity 6. A plurality of fixing holes 11 are provided on the surfaces of the first precast retaining wall segment 1, the second precast retaining wall segment 2, and the third precast retaining wall segment 3. The precast retaining wall segments can be fixed in the circular hole 5 by passing the first fixing bolts 7 through the fixing holes 11.

[0064] Subsequently, the first precast retaining wall segment 1 is inserted into the retaining wall ring notch from the carry cavity 1 to form a closed retaining wall ring. In this step, the carry cavity 6 is provided because the multi-segment precast retaining wall segments are affected by the thickness dimension of the retaining wall (the outer wall is longer than the inner wall), so that the outer walls cannot be spliced into a ring in the circular hole 5. This is also the inventive point of the construction method of the present invention. The carry cavity 6 can enable the second precast retaining wall segment 2 and the third precast retaining wall segment 3 inside the circular hole 5 to be first spliced along the inner wall of the circular hole 5, and then the first precast retaining wall segment 1 is squeezed from the outside to the inside to cooperate with the second precast retaining wall segment 2 and the third precast retaining wall segment 3 to achieve effective splicing of the precast retaining wall segments.

[0065] Step 5: After the first precast retaining wall segment 1, the second precast retaining wall segment 2, and the third precast retaining wall segment 3 are spliced into a ring, backfill the carry cavity 6.

[0066] Specifically, backfill stone aggregate and the like into the carry cavity 6 from the backfill port 13 to fill the carry cavity 6. The filler supports the first precast retaining wall segment 1 from the outside to prevent the first precast retaining wall segment 1 from moving backward.

[0067] Step 6: Fix the first precast retaining wall segment 1 on the stone aggregate backfilled in the carry cavity 6 by passing the first fixing bolts 7 through the fixing holes 11.

[0068] As a further improvement, in this embodiment, a limiting plate 4 is provided at the splicing joint between the first precast retaining wall segment 1 and the second precast retaining wall segment 2 and at the splicing joint between the first precast retaining wall segment 1 and the third precast retaining wall segment 3. Second fixing holes 12 are provided at the positions of the first precast retaining wall segment 1 corresponding to the limiting plate 4, and third fixing holes 41 are provided on the limiting plate 4. The first precast retaining wall segment 1 and the limiting plate 4 are fixed by passing the second fixing bolts 8 through the second fixing holes 12 and the third fixing holes 41. When the first precast retaining wall segment 1 is squeezed from the outside to the inside into the ring, the limiting plate 4 ensures the consistent positions among the first precast retaining wall segment 1, the second precast retaining wall segment 2, and the third precast retaining wall segment 3 and prevents them from shifting relative to each other.

[0069] Of course, corresponding fixing holes and fixing bolts can also be provided on the second precast retaining wall segment 2 and the third precast retaining wall segment 3 for fixed connection with the limiting plate 4 to further fix the second precast retaining wall segment 2 and the third precast retaining wall segment 3.

[0070] In this embodiment, the limiting plate 4 is arc-shaped, specifically an arc-shaped steel sheet, and the limiting plate 4 is arranged on the outer arc surface of the first precast segment 1 of the retaining wall. Since the arc-shaped steel sheet extends outwards on both sides, it effectively supports the second precast segment 2 and the third precast segment 3 on both sides of the first precast segment 1 of the retaining wall, preventing relative displacement of the first precast segment 1, the second precast segment 2, and the third precast segment 3 of the retaining wall.

[0071] After step 6 is completed, the circular retaining wall of this layer is formed. Subsequently, the next section can be excavated downwards, and repeating the above steps can achieve the dug hole operation at a certain depth.

[0072] It is worth mentioning that during the excavation of the next section, the carry cavity 6 excavated on the side wall of the circular hole 5 in step 2 should be staggered in the vertical direction from the carry cavity 6 of the upper layer. In this way, it can effectively prevent the first precast segment 1 installed in the upper layer from sliding down due to the lower end being hollowed out and unable to be supported, ensuring the stability of the upper retaining wall.

[0073] The precast retaining wall for manual dug piles and its construction method provided by the embodiment of the present invention set the first precast segment 1, the second precast segment 2, and the third precast segment 3 that can be spliced to form a closed ring, and a backfill port 13 is opened on the first precast segment 1 of the retaining wall. The backfill port 13 is arranged at a position close to the top of the first precast segment 1 of the retaining wall. During construction, a carry cavity 6 is excavated on the side wall of the circular hole 5, the second precast segment 2 and the third precast segment 3 are hoisted into the circular hole 5, and the first precast segment 1 is placed in the carry cavity 6. The first precast segment 1, the second precast segment 2, and the third precast segment 3 are spliced to form a closed retaining wall ring, the carry cavity 6 is backfilled, and then the first precast segment 1, the second precast segment 2, and the third precast segment 3 are fixed, and the circular hole retaining wall can be quickly formed. By prefabricating the first precast segment 1, the second precast segment 2, and the third precast segment 3 in advance and splicing them on-site, it effectively avoids the problems of long construction period, high cost, and difficult safety guarantee caused by traditional on-site casting. By prefabricating the retaining wall in advance, only the soil needs to be excavated in the circular hole 5, the retaining wall is installed and fixed, and continuous excavation can be carried out without waiting for the concrete to gain strength, effectively improving the efficiency of dug hole.

[0074] The first precast segment 1, the second precast segment 2, and the third precast segment 3 of the embodiment of the present invention are prefabricated in batches, with stable and guaranteed quality, and to a certain extent, reduce the labor and material costs. After the excavation is formed, the retaining wall can be quickly installed, effectively improving the working efficiency of the retaining wall construction in the hole, reducing the risk of hole wall collapse, and ensuring the safety of construction.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A construction method for precast retaining walls of manually dug piles, including: Precasting multiple retaining wall precast segments that can be spliced to form a closed ring; wherein, at least three of the retaining wall precast segments are provided, the arc length of the retaining wall precast segment is less than half of the circumference of the ring where the retaining wall precast segment is located, and at least one of the retaining wall precast segments is provided with a backfill port; Excavating a carry-in cavity on the side wall of the circular hole, the length of the carry-in cavity is not less than the arc length of the retaining wall precast segment provided with the backfill port; Placing the retaining wall precast segments into the circular hole, and placing the retaining wall precast segment provided with the backfill port into the carry-in cavity; Splicing multiple of the retaining wall precast segments to form a closed retaining wall ring; Backfilling the carry-in cavity; Fixing the retaining wall precast segments; Among them, the step of splicing multiple of the retaining wall precast segments includes: Sequentially splicing the retaining wall precast segments without the backfill port along the inner wall of the circular hole, making the gap of the retaining wall ring face the carry-in cavity, and splicing the retaining wall precast segment provided with the backfill port into the retaining wall ring from the direction of the carry-in cavity to the gap of the retaining wall ring to form a closed retaining wall ring.

2. The construction method for precast retaining walls of manually dug piles according to claim 1, characterized in that, The step of precasting multiple retaining wall precast segments that can be spliced to form a closed ring includes: Precasting a first retaining wall precast segment, a second retaining wall precast segment, and a third retaining wall precast segment that can be spliced to form a closed ring, the arc length of the first retaining wall precast segment is less than the arc lengths of the second retaining wall precast segment and the third retaining wall precast segment, and a backfill port is provided at a position near the top of the first retaining wall precast segment.

3. The construction method for precast retaining walls of manually dug piles according to claim 1, characterized in that, The step of backfilling the carry-in cavity includes: Filling the carry-in cavity from the backfill port and filling the carry-in cavity completely.

4. The construction method for precast retaining walls of manually dug piles according to claim 1, characterized in that, The step of fixing the retaining wall precast segments includes: Setting fixing bolts in the fixing holes on the surface of the retaining wall precast segment and fixing the retaining wall precast segment on the inner wall of the circular hole.

Images