A top-down artificial excavation foundation assembly type retaining wall construction process

Abstract

The application relates to a top-down artificial excavation foundation assembled retaining wall construction process, which comprises the following steps: excavating first-section retaining wall earthwork; assembling the first-section assembled retaining wall; assembling a retaining wall chuck at a pit opening, inserting a latch of the retaining wall chuck into a reserved hole of the first-section assembled retaining wall, and suspending the first-section assembled retaining wall; excavating second-section retaining wall earthwork; hoisting the second-section assembled retaining wall to the pit bottom through a hoisting tool of a deep foundation pit integrated machine, and assembling the second-section assembled retaining wall; connecting the second-section assembled retaining wall with the first-section assembled retaining wall through a U-shaped buckle; reciprocally installing other-section assembled retaining walls from top to bottom, until all the assembled retaining walls are connected into a whole. The application has the advantages of reasonable design, simple combination and assembly, fixation, utilization of the retaining wall chuck above the ground and the deep foundation pit integrated machine to complete the assembled retaining wall construction in the whole deep foundation pit, saved working hours, improved work efficiency, reduced labor intensity of engineering construction personnel and reduced construction risk.

Description

Technical fields:

[0001] This invention relates to a top-down, manually excavated foundation prefabricated retaining wall construction process. Background technology:

[0002] Most of the current wall construction adopts the cast-in-place method, which has the following technical defects: (1) During the excavation process of wall construction, the excavation depth is deep and the project implementation is difficult; (2) The wall construction process is prone to collapse, which makes the personal risk of construction personnel high; (3) The concrete pouring cycle is long, and multiple batches need to be poured, with time intervals in between, resulting in a long construction cycle and time-consuming and labor-intensive maintenance; (4) There are defects such as uncontrollable processing technology and poor wall forming accuracy. Summary of the Invention:

[0003] The present invention addresses the problems existing in the prior art, namely, the technical problem to be solved by the present invention is to provide a top-down manual excavation foundation prefabricated retaining wall construction process.

[0004] To achieve the above objectives, the technical solution adopted by this invention is: a top-down manual excavation foundation prefabricated retaining wall construction process, comprising a ring-shaped retaining wall chuck and a prefabricated retaining wall. The prefabricated retaining wall is composed of several arc-shaped retaining wall panels spliced ​​together to form a ring shape. Adjacent retaining wall panels are connected and fixed by bolts. Each retaining wall panel has several reserved holes along its circumference, and the reserved holes are radially continuous along the retaining wall panel. The construction process includes the following steps:

[0005] Step S1: Perform pile measurement and positioning work, and mark out the control crosshairs of the pile center;

[0006] Step S2: Excavate the bored pile from the crosshair at the pile center;

[0007] Step S3: Excavate the first section of retaining wall soil to the required depth;

[0008] Step S4: Assemble the first section of the prefabricated retaining wall at the bottom of the pit excavated in step S3;

[0009] Step S5: Level the soil around the pit opening and assemble the retaining wall chuck at the pit opening. Insert the radially extending pins on the retaining wall chuck into the reserved holes of the first prefabricated retaining wall section to suspend the first prefabricated retaining wall section. After the retaining wall chuck is installed, it is concentric with the first prefabricated retaining wall section.

[0010] Step S6: Install the deep foundation pit integrated machine;

[0011] Step S7: Excavate the second section of retaining wall soil to the required depth;

[0012] Step S8: The deep foundation pit integrated machine uses hoisting tools to lift several wall panels of the second prefabricated retaining wall to the bottom of the pit excavated in step S6, and assembles the second prefabricated retaining wall.

[0013] Step S9: Connect the second prefabricated retaining wall section to the first prefabricated retaining wall section using U-shaped clips;

[0014] Step S10: Install other prefabricated retaining walls from top to bottom in a cyclical manner until all prefabricated retaining walls are connected into a whole;

[0015] Step S11: From top to bottom, every three prefabricated retaining walls form a group. In each group, multiple evenly distributed steel rods are driven into the reserved holes of the lowest prefabricated retaining wall section and inserted into the soil layer.

[0016] Furthermore, the wall-protecting chuck is composed of several chuck plates spliced ​​together. The ends of two adjacent chuck plates are connected and fixed by chuck connecting bolts. Each chuck plate has two pairs of radial grooves that run through it. A pin slides through the radial groove, and a locking bolt for locking the pin is screwed to the top of the radial groove.

[0017] Furthermore, the two ends of the wall panel are respectively provided with a first splicing part and a second splicing part. The first splicing part and the second splicing part are distributed inside and outside and are both arc-shaped. When two adjacent wall panels are spliced, the second splicing part is placed on the outside of the first splicing part, and the first splicing part and the second splicing part are connected and fixed by wall panel connecting bolts.

[0018] Furthermore, the hoisting fixture includes an arc-shaped fixture body, on the outer arc surface of which are evenly distributed several hooks for passing through pre-reserved holes in the wall panel. The hooks have their heads facing upwards to facilitate hooking the upper end of the wall panel from bottom to top.

[0019] Furthermore, in step S3, the excavation depth of the first section of retaining wall earthwork is 50mm; in step S4, the first section of prefabricated retaining wall is exposed 220mm above the ground.

[0020] Furthermore, each wall panel of the prefabricated wall is prefabricated in the factory.

[0021] Compared with the prior art, the present invention has the following advantages: The present invention is reasonably designed and only requires simple assembly and fixing. It can complete the prefabricated retaining wall construction in the entire deep foundation pit by using the retaining wall chuck on the ground and the deep foundation pit integrated machine, which saves time, improves efficiency, reduces the labor intensity of construction workers and reduces construction risks. Attached image description:

[0022] Figure 1This is a schematic diagram of a partial structure after construction in an embodiment of the present invention.

[0023] Figure 2 This is a top view schematic diagram of the cooperation between the wall-mounted chuck and the assembled wall-mounted structure in an embodiment of the present invention;

[0024] Figure 3 This is a three-dimensional structural diagram of the cooperation between the wall-mounted chuck and the assembled wall-mounted structure in an embodiment of the present invention;

[0025] Figure 4 This is a top view schematic diagram of the wall-mounted chuck in an embodiment of the present invention;

[0026] Figure 5 This is a three-dimensional structural diagram of the wall panel in an embodiment of the present invention;

[0027] Figure 6 This is a three-dimensional structural diagram of the assembled retaining wall in an embodiment of the present invention;

[0028] Figure 7 This is a three-dimensional structural diagram of the wall panel in an embodiment of the present invention;

[0029] Figure 8 This is a top view schematic diagram of the wall panel and hoisting fixture in an embodiment of the present invention;

[0030] Figure 9 This is a three-dimensional structural diagram of the hoisting fixture in an embodiment of the present invention. Detailed implementation method:

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0032] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0033] like Figures 1-9As shown, this invention discloses a top-down, manually excavated foundation prefabricated retaining wall construction process. A retaining wall chuck is placed on the ground to suspend the first retaining wall section. Other retaining walls are sequentially suspended below the previous section, stacked one on top of the other until all retaining wall units are connected. Specifically, it includes a ring-shaped retaining wall chuck 1 and prefabricated retaining walls 2. The retaining wall chuck 1 is placed on the ground. The prefabricated retaining wall 2 is composed of three arc-shaped retaining wall panels 3 joined together to form a ring. Adjacent retaining wall panels 3 are fixed together by bolts. Each retaining wall panel 3 has several pre-drilled holes 4 along its circumference, and these holes 4 extend radially through the retaining wall panel 3.

[0034] The specific construction process includes the following steps:

[0035] Step S1: Conduct pile measurement and positioning work, and mark out the control crosshairs of the pile center: Before construction, pile measurement and positioning work is carried out. First, based on the coordinate relationship between the construction control points and the main control axis, the main control axis is marked out. Then, the main control axis is gradually densified and marked out for each axis. Finally, based on the coordinate position relationship between the pile center and the axis, the control crosshairs of the pile center are marked out. After the pile position is marked out, it must be repeatedly checked before entering the excavation stage.

[0036] Step S2, excavation of the bored pile from the control crosshair at the pile center: After the crosshair at the pile center of the bored pile is positioned, the excavation of the bored pile can begin. The excavation size is selected according to the pile diameter, and the retaining wall size is smaller than the pile diameter to ensure smooth settlement of the retaining wall and sufficient space between the prefabricated retaining wall and the soil to ensure dense concrete filling;

[0037] Step S3, excavate the first section of retaining wall soil to the required depth: excavation should be carried out layer by layer from top to bottom, first excavating the middle part, and then expanding to the perimeter. Pay attention to controlling the cross-sectional dimensions of the excavation at all times during the excavation process. The excavation depth is 50mm for the first section of retaining wall pit.

[0038] Step S4: Assemble the first prefabricated retaining wall 16 at the bottom of the pit excavated in step S3: Place the first prefabricated retaining wall 16, ensure that the first prefabricated retaining wall is not tilted, check the foundation axis and elevation, and ensure that the deviation between the center line of the well ring retaining wall and the design axis is not greater than 20mm. The first prefabricated retaining wall protrudes about 220mm above the ground.

[0039] Step S5: Level the soil around the pit opening and assemble the retaining wall chuck 1 at the pit opening. Insert the radially extending pin 8 on the retaining wall chuck 1 into the reserved hole 4 of the first prefabricated retaining wall 16 to suspend the first prefabricated retaining wall 16. After the retaining wall chuck 1 is installed, it should be concentric with the first prefabricated retaining wall 16, and the height of the first prefabricated retaining wall protruding above the ground should be about 220mm.

[0040] Step S6: Install the deep foundation pit integrated machine;

[0041] Step S7, excavate the second section of retaining wall soil to the required depth: the excavation should be carried out layer by layer from top to bottom, first excavating the middle section, and then expanding to the perimeter. Pay attention to controlling the cross-sectional dimensions of the excavation at all times during the excavation process. The excavation height of a single section should be 270mm, and the excavation dimensions should meet the pile diameter requirements.

[0042] Step S8: The deep foundation pit integrated machine uses hoisting tools to lift the three wall panels 3 of the second prefabricated retaining wall 17 to the bottom of the pit excavated in step S6, and assembles the second prefabricated retaining wall 17.

[0043] Step S9: Connect the second prefabricated retaining wall 17 to the first prefabricated retaining wall 16 using the U-shaped buckle 15;

[0044] Step S10: Install other prefabricated retaining walls from top to bottom in a cyclical manner (e.g., the third prefabricated retaining wall 18, the fourth prefabricated retaining wall 19, etc., with adjacent prefabricated retaining walls connected by U-shaped buckles) until all prefabricated retaining walls are connected into a whole.

[0045] Step S11: From top to bottom, every three prefabricated retaining walls form a group. In each group, six evenly distributed steel rods 20 are driven into the reserved holes of the lowest prefabricated retaining wall section. The steel rods are inserted into the soil layer.

[0046] In this embodiment, the wall-mounted chuck 1 comprises three chuck plates 5 joined together in a ring structure. The ends of adjacent chuck plates 5 are connected and fixed by chuck connecting bolts 6. Each chuck plate 5 has two pairs of radial grooves 7 extending radially through it. A pin 8 slides through the radial groove 7, and a locking bolt 9 for locking the pin 8 is screwed to the top of the radial groove 7. During operation, the pin is slid towards the inside of the wall-mounted chuck, so that the pin extends out of the radial groove and passes through the reserved hole on the wall-mounted plate to suspend the first section of the assembled wall-mounted chuck; then the pin is locked and fixed by the locking bolt.

[0047] In this embodiment, the chuck plate 5 is welded from square or round hollow steel pipes; the pin 8 is made of channel steel or I-beam.

[0048] In this embodiment, the two ends of the wall panel 3 are respectively provided with a first splicing part 10 and a second splicing part 11. The first splicing part 10 and the second splicing part 11 are distributed inside and outside and are both arc-shaped. When two adjacent wall panels are spliced, the second splicing part 10 is placed on the outside of the first splicing part 11, and the first splicing part and the second splicing part are connected and fixed by wall panel connecting bolts.

[0049] In this embodiment, the lifting fixture 12 includes an arc-shaped fixture body 13. The outer arc surface of the fixture body 13 has a plurality of hooks 14 evenly distributed for passing through pre-drilled holes 4 in the retaining wall panel 3. The hooks 14 have their heads facing upwards to facilitate hooking the upper end of the retaining wall panel 3 from bottom to top. In use, the outer arc surface of the fixture body 13 is aligned with the inner arc surface of the retaining wall panel 3, and each hook passes through the pre-drilled holes 4 in the retaining wall panel 3. Then, the lifting fixture 12 is lifted upwards, allowing the hooks 14 to hook the upper end of the retaining wall panel 4 from bottom to top, thus facilitating the lifting of the retaining wall panel.

[0050] In this embodiment, in step S3, the excavation depth of the first section of retaining wall soil is 50mm; in step S4, the first section of prefabricated retaining wall protrudes 220mm above the ground.

[0051] In this embodiment, each panel of the prefabricated retaining wall 2 is prefabricated in the factory and assembled on-site, effectively improving the quality of the retaining wall. The prefabricated retaining wall eliminates the concrete pouring and curing steps required for cast-in-place retaining walls, making construction simple, quick, and economical. It ensures the continuity of the foundation pit excavation, effectively shortening the construction period, improving construction safety, reducing safety risks, and saving significant manpower and resources while reducing the workload of formwork, pouring, and curing.

[0052] In this embodiment, the specific steps in step S6 are as follows: Install the integrated deep foundation pit machine; adjust the length of the support legs of the integrated deep foundation pit machine to ensure that the integrated deep foundation pit machine is placed stably; install protective kick plates around the integrated deep foundation pit machine; install the waste material lifting electric hoist; check for damage to the wire rope; check the effectiveness of the electric hoist brake and safety protection device; check the effectiveness of the material bucket hook safety buckle; install the gas detection and automatic ventilation system of the integrated deep foundation pit machine, and check whether it can work normally; install the personnel ladder and lighting; install the personnel rescue system and fall arrestor, and verify their effectiveness.

[0053] In this embodiment, when assembling the second prefabricated retaining wall: (1) Install the hoisting fixture on the retaining wall panel and securely fix the retaining wall panel and the hoisting fixture together with an anti-falling safety rope; (2) Use an electric hoist to hoist the three retaining wall panels down to the bottom of the pit one by one. When the hoisting fixture descends, a guide rope should be used to control its horizontal swing. The bolts and nuts of the retaining wall panel should be pre-installed before being lowered into the well. When the retaining wall panel is lowered to the bottom of the pit, the construction personnel at the bottom of the pit should hide under the semi-circular protective plate and use the semi-circular protective plate to ensure the safety of the construction personnel (the semi-circular protective plate is 2 meters high from the bottom of the pit and uses the same protective plate used during the construction of the cast-in-place retaining wall); (3) Each retaining wall panel should be hung on the previous retaining wall section with a U-shaped buckle when it reaches the bottom of the pit to ensure that it will not fall off. After the second retaining wall panel reaches the bottom of the pit, the construction personnel will assemble the second retaining wall panel with the first retaining wall panel and lock it with bolts. After all three retaining wall panels are at the bottom of the pit, the prefabricated retaining wall is assembled into a complete ring using bolts. Tighten the nuts on the U-shaped clips between the retaining wall panels and the previous retaining wall section, and reliably connect the assembled prefabricated retaining wall to the first prefabricated retaining wall section using special U-shaped clips.

[0054] In this embodiment, construction proceeds step by step in step S9, involving earthwork excavation and lowering the retaining wall panels one by one to the bottom of the pit using a lifting device. After three retaining wall panels are assembled into a complete retaining wall, they are fixed to the previous retaining wall section using special U-shaped clips. The weight of the next retaining wall section is borne by the previous retaining wall section through the special U-shaped clips. All retaining wall sections are eventually hung on a chuck, with the chuck bearing their entire weight. Every two retaining wall sections, one section is reinforced with steel rods for secondary protection. Each retaining wall section consists of three retaining wall panels, with one steel rod driven into each of the two holes on the side of each panel, for a total of six steel rods per section. After each section of the pile hole retaining wall is completed, the pile position cross axis and elevation must be set at the top of the retaining wall. The cross axis is aligned, and a plumb line is used to project the line towards the bottom of the well. A radius gauge is used to check the verticality and flatness of the hole wall and the center of the hole. Use the deep foundation pit integrated machine to lift the excavated soil away from the pile hole; it is strictly forbidden to pile the soil at the pit opening.

[0055] In this embodiment, during construction, the cylindrical body of the expanded-base pile should be excavated first, and then the soil should be cut from top to bottom to expand the pile according to the dimensions and shape of the expanded base, reaching the design required foundation pit elevation. No prefabricated retaining wall is used for the expanded base section. When the design pile bottom elevation is reached, the bottom of the hole should be cleaned. The bottom of the hole should be flat, free of mud, loose debris, and sediment. After passing self-inspection, the next process can proceed.

[0056] This invention employs a wall retaining chuck installed on the ground to bear the initial weight of the first wall retaining section. The wall retaining units are constructed using a top-down, sequentially suspended and stacked construction technique. During implementation, only simple assembly and fixing are required. The steel wall retaining chuck on the ground and the deep foundation pit integrated machine can be used to complete the prefabricated wall retaining construction in the entire deep foundation pit. This process saves time, improves efficiency, reduces the labor intensity of construction workers, and lowers construction risks.

[0057] If this invention discloses or relates to components or structural parts that are fixedly connected to each other, then, unless otherwise stated, a fixed connection can be understood as: a fixed connection that can be detached (e.g., using bolts or screws), or a fixed connection that cannot be detached (e.g., riveting, welding). Of course, a fixed connection can also be replaced by an integral structure (e.g., manufactured in one piece using a casting process) (except where it is obviously impossible to use an integral molding process).

[0058] In addition, unless otherwise stated, the terms used in any of the technical solutions disclosed in this invention to indicate positional relationships or shapes include states or shapes that are similar to, close to, or approximate with those states or shapes.

[0059] Any component provided by this invention can be assembled from multiple individual components or can be a single component manufactured by a one-piece molding process.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A top-down, manually excavated foundation prefabricated retaining wall construction process, characterized in that: The system includes a ring-shaped retaining chuck and a prefabricated retaining wall. The prefabricated retaining wall is composed of several arc-shaped retaining wall panels spliced ​​together to form a ring shape. Adjacent retaining wall panels are fixed together by bolts. Each retaining wall panel has several reserved holes along its circumference, and the reserved holes are radially continuous along the retaining wall panel. The construction process includes the following steps: Step S1: Perform pile measurement and positioning work, and mark out the control crosshairs of the pile center; Step S2: Excavate the bored pile from the crosshair at the pile center; Step S3: Excavate the first section of retaining wall soil to the required depth; Step S4: Assemble the first section of the prefabricated retaining wall at the bottom of the pit excavated in step S3; Step S5: Level the soil around the pit opening and assemble the retaining wall chuck at the pit opening. Insert the radially extending pins on the retaining wall chuck into the reserved holes of the first prefabricated retaining wall section to suspend the first prefabricated retaining wall section. After the retaining wall chuck is installed, it is concentric with the first prefabricated retaining wall section. Step S6: Install the deep foundation pit integrated machine; Step S7: Excavate the second section of retaining wall soil to the required depth; Step S8: The deep foundation pit integrated machine uses hoisting tools to lift several wall panels of the second prefabricated retaining wall to the bottom of the pit excavated in step S6, and assembles the second prefabricated retaining wall. Step S9: Connect the second prefabricated retaining wall section to the first prefabricated retaining wall section using U-shaped clips; Step S10: Install other prefabricated retaining walls from top to bottom in a cyclical manner until all prefabricated retaining walls are connected into a whole; Step S11: From top to bottom, every three prefabricated retaining walls form a group. In each group, multiple evenly distributed steel rods are driven into the reserved holes of the lowest prefabricated retaining wall section and inserted into the soil layer.

2. The top-down manually excavated foundation prefabricated retaining wall construction process according to claim 1, characterized in that: The wall-protecting chuck is composed of several chuck plates spliced ​​together. The ends of two adjacent chuck plates are connected and fixed by chuck connecting bolts. Each chuck plate has two pairs of radial grooves that run through it. A pin slides through the radial groove, and a locking bolt for locking the pin is screwed to the top of the radial groove.

3. The top-down manually excavated foundation prefabricated retaining wall construction process according to claim 1, characterized in that: The two ends of the wall panel are respectively provided with a first splicing part and a second splicing part. The first splicing part and the second splicing part are distributed inside and outside and are both arc-shaped. When two adjacent wall panels are spliced, the second splicing part is placed on the outside of the first splicing part, and the first splicing part and the second splicing part are connected and fixed by wall panel connecting bolts.

4. The top-down manually excavated foundation prefabricated retaining wall construction process according to claim 1, characterized in that: The hoisting fixture includes an arc-shaped fixture body. Several hooks for passing through pre-drilled holes in the wall panel are evenly distributed on the outer arc surface of the fixture body. The hook heads face upwards to facilitate hooking the upper end of the wall panel from bottom to top.

5. The top-down manually excavated foundation prefabricated retaining wall construction process according to claim 1, characterized in that: In step S3, the excavation depth of the first section of retaining wall earthwork is 50mm; in step S4, the first section of prefabricated retaining wall is exposed 220mm above the ground.

6. The top-down manually excavated foundation prefabricated retaining wall construction process according to claim 1, characterized in that: Each panel of the prefabricated wall panel is prefabricated in the factory.

Images