CN115744693B - A recyclable method for lifting and dismantling prefabricated retaining walls of expanded foundation pits - Google Patents
A recyclable method for lifting and dismantling prefabricated retaining walls of expanded foundation pitsInfo
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- CN115744693B CN115744693B CN202211250366.5A CN202211250366A CN115744693B CN 115744693 B CN115744693 B CN 115744693B CN 202211250366 A CN202211250366 A CN 202211250366A CN 115744693 B CN115744693 B CN 115744693B
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Abstract
A method for lifting and dismantling a recyclable bottom-expanding foundation pit assembled retaining wall includes the steps of firstly building a pulley lifting platform, then dismantling an assembled retaining wall, binding lifting ropes on a lower segment retaining wall ring body in a lifting group to a triangular lifting frame by taking each two segments as a lifting group in the dismantling process, lifting the lifting group upwards to a certain height by means of a lifting device, moving the lifting group, loosening the lifting ropes of the segments, repeating the steps until all segment retaining walls are dismantled, and finally carrying out post-construction and retaining wall maintenance treatment on a construction site. The method for lifting and dismantling the assembled retaining wall of the recyclable expanded foundation pit, which is provided by the invention, is lifted and dismantled from top to bottom, ensures the stable dismantling and recycling of the assembled retaining wall foundation, and reduces the economic cost of geological disaster remediation engineering.
Description
Technical Field
The invention relates to the technical field of geological disaster remediation engineering construction, in particular to a recyclable method for lifting and dismantling an assembled retaining wall of a foundation pit under a reamed condition.
Background
On the premise that most high-voltage transmission lines in China inevitably adopt a wiring mode of crossing mountain forest, once landslide, mud-rock flow or other geological disasters occur, the foundation of the high-voltage transmission tower is inevitably subjected to sedimentation or deviation risks, so that the high-voltage iron tower is toppled over, the power failure phenomenon occurs when the high-voltage iron tower is light, mountain forest fire is caused when the high-voltage iron tower is heavy, and national economy is damaged. Therefore, how to quickly adjust and reinforce the iron tower foundation or build the repair tower after the occurrence of the geological disaster, and avoiding further risks is a problem to be solved urgently by the electric power department.
The adjusting and reinforcing of the iron tower foundation or the establishment of the rush-repair tower can be used without leaving the foundation protection wall, so that the problems of deformation, collapse and water seepage of the wall of the foundation pit in the construction process can be avoided, and the personal safety of constructors is ensured to a certain extent. The foundation is regulated by manually excavating foundation pit and casting the retaining wall on site under the geographical environment with limited traffic such as mountain areas and forests, and the method has the advantages that 1) the construction period of the cast-in-situ retaining wall is overlong and generally takes more than half of the time of foundation pit excavation engineering, the cast-in-situ concrete foundation retaining wall cannot be immediately put into use, and the cast-in-situ retaining wall also has to be maintained to a certain strength for use, when the foundation is in a unfortunately 'condition', the foundation retaining wall is not easy to see 'on the emergency repair site', 2) the foundation retaining wall formed by concrete is heavy in weight, the transportation and installation by manpower are very difficult, and large lifting equipment cannot be normally used because the complicated and dangerous topography environment of the mountain areas is not easy to normally use, which clearly brings dangerous challenges to the mountain area emergency work, 3) the traditional foundation retaining wall is rectangular or cylindrical, is mostly suitable for foundation pit excavation of pile foundation, the foundation can only be enlarged in the upper and lower ranges, the foundation pit cannot be widened in the left and right directions, namely the foundation pit cannot be cast to be realized, and the foundation retaining wall is difficult to be cast in a certain condition, and 4) the foundation retaining wall is difficult to be buried in the corresponding condition, and the foundation is not required to be circulated, and the foundation is not required to be placed into the foundation.
In contrast, a great deal of researches on the design and construction process of foundation concrete retaining walls are presented in the domestic and foreign fields, such as Hunan electric power-32 nd roll-5 th period, authors-Zhou Mingzhu, entitled "application of steel cylinder retaining wall process in foundation construction of hole digging piles", the article proposes that the steel cylinder retaining walls replace the traditional foundation concrete retaining walls, a gate-type holding pole hoisting system is adopted to hoist the steel cylinders manufactured in advance into a foundation pit for construction work, because concrete on-site pouring and maintenance work is omitted, the construction period is greatly shortened, but the steel cylinder adopted by the method is as long as 3.5m, and the used door-type holding pole hoisting system is as high as 5.5m, so that the construction site of the door-type holding pole hoisting system needs a large enough and flat site and is not suitable for mountain rescue work, and the door-type holding pole device adopted by hoisting is complex in structure and long in on-site assembly time, thereby increasing the time cost of rescue.
The article No. 1671-9913 (2020) S1-0088-04 "a new type of artificial digging foundation assembly type dado design research" is from China' S knowledge network. According to the design, the foundation retaining wall is divided into the plurality of cylindrical lock catch foundation retaining wall members, the problems that the whole weight of the concrete retaining wall is large and the mountain is difficult to transport are solved, and the problem that the service life of cast-in-place concrete is long is solved, but the design depends on the bottom soil body to bear the weight of the retaining wall, so that the transverse widening of the bottom of a foundation pit is realized, the sinking phenomenon of the foundation retaining wall in the excavation process cannot be avoided, and the safety condition of personnel in construction work cannot be guaranteed.
The patent with the application number of 202111041370.6 is a rapid-installation rectangular pile hole assembly type retaining wall and an installation method thereof, each component of the retaining wall is pre-drilled with rectangular holes, and when concrete foundation pouring is carried out, concrete can be contacted with undisturbed soil through the holes, so that the overall vertical bearing capacity of the foundation is enhanced, but the design cannot consider the transverse expansion condition of the holes, and the universality is poor.
In summary, the existing foundation retaining walls have advantages and disadvantages, but the removing and recycling of the retaining walls are basically not considered, most of the retaining walls are buried underground along with the concrete foundation, and even bear the acting force of the upper structure together with the foundation, so that the economic cost of the rescue work is greatly increased, and the time cost of the rescue work is not increased in the removing step because the rescue foundation is already established when the rescue work is carried out.
Disclosure of Invention
The invention aims to solve the technical problem of providing a recyclable lifting and dismantling method for the assembled retaining wall of the expanded foundation pit, which is capable of ensuring the recycling without digging the soil around the foundation, large-area sites and damaging the cast-in-situ foundation and the foundation retaining wall.
In order to solve the technical problems, the invention adopts the following technical scheme:
a recyclable method for lifting and dismantling a bottom-expanding foundation pit assembled retaining wall comprises the following steps:
Step one, completing installation and construction of a pulley lifting platform and a triangular balance frame;
Step two, taking n sections of retaining wall ring bodies as a lifting group, wherein n=1, 2, because each section of retaining wall ring body is 0.5m in height, n selects the number of the required retaining wall ring bodies according to the depth of a foundation pit, binding 3 strands of lifting ropes which are arranged on the lifting group at the uppermost layer and are positioned at the lifting rings of the retaining wall ring bodies at the bottom end of the lifting group on a triangular balance frame respectively, binding 3 strands of bearing steel wire ropes which are positioned at a single-wheel lifting hook pulley on the midpoint of three sides of the triangular balance frame, manually assisting in adjusting the position of the triangular balance frame, manually grinding and tensioning the traction steel wire ropes until the lifting ropes are straightened, and gradually loosening the bearing steel wire ropes in the process, so that the lifting is not influenced;
step three, after determining that 3 strands of lifting ropes are in a vertical tightening state, continuing to rotate the manual grinding to stably and slowly lift until the uppermost wall protecting ring body in the uppermost lifting group is separated from the top 0.1-0.2 m of the foundation pit;
Step four, checking whether the connecting sheet in the wall protection channel is carried out of position or even blocked in the channel in the lifting process, and if so, cleaning the connecting sheet out of the channel in advance by using a magnet to avoid damaging a semi-solidified concrete foundation in the lifting process;
Step five, after the channel cleaning is confirmed, binding 3 strands of lifting ropes of the next lifting group at the lifting ring of the wall protection ring body at the bottom end of the lifting group on a triangular balance frame respectively, and manually transporting the wall protection ring body at the uppermost end of the lifting group to a space beside a foundation pit when the wall protection ring body at the uppermost end of the lifting group is 0.1-0.2 m away from the top of the foundation pit and unwinding the lifting ropes;
And step six, when the lifting height of the lifting group is larger than the maximum movable lifting height of the lifting device, the triangular balance frame needs to be replaced midway, and when the triangular balance frame in lifting is lifted to the maximum lifting height, the triangular balance frame needing to be installed is connected with the circular ring on the lifting rope close to the top of the foundation pit in a manual auxiliary mode. The method comprises the steps of taking down and fixing a bearing steel wire rope on a triangular balance frame in hoisting on the triangular balance frame in hoisting, unlocking a lifting rope on the triangular balance frame in hoisting to separate the triangular balance frame in hoisting from the lifting rope, transferring a traction steel wire rope on the triangular balance frame in hoisting to the triangular balance frame in hoisting, taking down the triangular balance frame in hoisting at the moment, and hoisting the wall protecting ring body upwards again after the installation of the triangular balance frame in hoisting is completed.
And step seven, repeating the step six until the residual lifting height of the lifting group is within the movable lifting height, and then lifting and recycling the lifting group to assemble the retaining wall.
Step eight, repeating the step two to the step seven until all the retaining wall ring bodies except the hollow retaining wall ring body and the circulating retaining wall ring body are lifted out of the foundation pit, wherein the hollow retaining wall ring body and the circulating retaining wall ring body are adhered together with the foundation along with the pouring of concrete at the moment so as to strengthen the bearing capacity of the foundation, and therefore, the hollow retaining wall ring body and the circulating retaining wall ring body cannot be recycled;
And step nine, after the steps are finished, backfilling soil into the retaining wall channel, and compacting the soil by using a compacting tool. And (5) finishing the dismantling work of the assembled retaining wall after the engineering inspection is qualified.
And step ten, after the wall protection dismantling work is finished, post-treatment is required to be carried out on the construction site.
In the second step, a certain number of piles are driven around the foundation pit before the demolishing work, and the lifting ropes of all lifting groups are bound on the piles and marked.
In the first step, the movable lifting height of the pulley lifting platform is h 1, the unilateral length l of the triangular balance frame is related to the radius r of the foundation pit, and the calculation formula is as follows:
Considering that the height of the single-section wall protection ring body is 0.5m, the single-section wall protection ring body can be moved by hand by being separated from the ground by 0.1m, so that the movable lifting height is required to be ensured to be not less than 0.5m, h 1 is 0.6-1 m under the condition of leaving a certain margin, the angle alpha of the pulley bracket is 45-75 degrees, the height h 2 of the pulley bracket is determined by the movable lifting height h 1 and the included angle alpha of the pulley bracket and the horizontal direction, and the calculation formula of h 2 is as follows:
Because the pulley bracket root opening L 4 must be larger than the width of the foundation pit and a certain margin is reserved for upward lifting of the triangular balance frame, the calculation formula of the fixed L 4 is as follows:
L4＝h2 tanα
The pulley lifting platform comprises a connecting seat, wherein the lower end of the connecting seat is supported and fixed through a supporting leg, a fixed pulley hook is arranged at the center of the connecting seat, the fixed pulley hook is used for hanging a single-wheel hook pulley, a manual grinder is arranged on the corresponding ground, one end of a traction steel wire rope is arranged on the manual grinder, the other end of the traction steel wire rope bypasses a pulley of the single-wheel hook pulley and is then fixed on a triangular balance frame, a bearing steel wire rope is arranged on a hook of the single-wheel hook pulley, and the other end of the bearing steel wire rope is fixed at the middle point of the triangular balance frame.
The retaining wall ring body in the second step comprises arc-shaped plate pieces, a plurality of arc-shaped plate pieces are spliced to form the retaining wall ring body, a hanging ring is arranged on the outer side of each retaining wall ring body, the hanging ring is connected with a hanging rope, the hanging rope extends out of the foundation pit, and the plurality of sections of retaining wall ring bodies are aligned up and down and are tightly connected through connecting pieces in sequence to form a retaining wall main body.
The arc-shaped plate is characterized in that a positioning clamping part is arranged left and right, a connecting hole is formed in the positioning clamping part, and adjacent arc-shaped plates are spliced through the positioning clamping part and locked through bolts.
The arc-shaped plate is made of an aluminum magnesium alloy material.
At least one perforation is distributed on the side wall of the section of the wall protection ring body at the lowest end, the perforation is used for a constructor to carry out transverse bottom expanding engineering, and a drainage hole is arranged on the section of the wall protection ring body adjacent to the wall protection ring body with the perforation.
The lifting rope consists of a plurality of sections of steel wire ropes and circular rings, and the adjacent steel wire ropes are connected through the circular rings.
The invention relates to a recyclable method for lifting and dismantling a bottom-expanding foundation pit assembled retaining wall, which has the following technical effects:
1) The fabricated retaining wall is machined by adopting the aluminum magnesium alloy, so that the defects of long service life, heavy weight and difficult transportation of the traditional cast-in-place concrete are overcome, the aluminum magnesium alloy has higher elastic modulus and good stress stability, and instability and damage are not easy to occur. The assembled structure is simple and convenient to assemble, does not occupy a large area of field, is suitable for environments with more obstacles such as mountain areas, forests and the like, and can be suitable for mountain area emergency situations of imperative in the minute.
2) The section retaining wall at the bottom of the retaining wall adopts a hollowed-out design, so that the excavation work in the four directions of up, down, left and right of the foundation pit can be realized, the excavation requirement of the bottom expanding part of the foundation pit can be met, and the applicability is strong. When the concrete pile body is poured in the foundation pit with the expanded bottom, the through holes on the porous retaining wall ring body and the bottom retaining wall ring body can ensure that concrete slurry is well poured into the foundation pit with the expanded bottom, and the pouring is compact, so that the vertical bearing capacity of the foundation with the expanded bottom is ensured.
3) The lifting rings are arranged on the outer sides of the retaining wall ring bodies, so that the retaining wall ring bodies can be connected with lifting ropes and matched with corresponding lifting devices, lifting and recycling of the retaining wall ring bodies can be achieved, green economic development is achieved, and the blank of a basic retaining wall construction process in recycling and dismounting work is filled.
4) The H-shaped connecting pieces are vertically spliced, so that the whole retaining wall device is simple to splice, the bolts are not needed, and the foundation pit operation time is shortened. The arc-shaped structure body and the transition connecting sheet are made of high-strength materials, the bearing performance of the retaining wall ring body is good, and the construction safety is high. Meanwhile, the surface of the arc-shaped structure is coated with a release agent, so that the problem of difficult release in the re-hoisting process is avoided.
5) The lifting and dismantling method from top to bottom is adopted, so that the stable dismantling and recycling of the assembled type retaining wall foundation are ensured on the premise that the surrounding soil of the foundation is not required to be excavated, a large-area site is not required, the cast-in-situ foundation is not damaged, and the assembled retaining wall is assembled, and the economic cost of geological disaster remediation engineering is reduced.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
fig. 1 is a schematic structural view of an arc-shaped plate (an arc-shaped plate of a solid retaining wall ring body) in the present invention.
Fig. 2 is a schematic structural view of an arc-shaped plate (arc-shaped plate of a circulation wall ring) according to the present invention.
Fig. 3 is a schematic structural view of an arc-shaped plate (an arc-shaped plate of a hollow retaining wall ring body) in the present invention.
Fig. 4 is an exploded view of the present invention after the wall protector is detached.
Fig. 5 is a cross-sectional view of a connecting piece in the present invention.
Fig. 6 is a schematic view of the attachment of the present invention.
Fig. 7 is a partial schematic view of the assembled retaining wall ring according to the present invention.
Fig. 8 is a schematic view of the working state of the present invention (the retaining wall ring is removed in pairs gradually).
Fig. 9 is a schematic view of the working state of the present invention (simplified pulley lifting platform part).
Fig. 10 is a schematic diagram of the tripod replacement according to the present invention.
Fig. 11 is a schematic view of a pulley lift platform according to the present invention.
Fig. 12 is a schematic view of a connecting seat in the present invention.
Fig. 13 is a schematic view of a hoist rope in accordance with the present invention.
Fig. 14 is a schematic view showing an operation state of the tripod in which the tripod needs to be replaced in the present invention.
In the figure, a retaining wall ring body 1, an arc-shaped plate 1.1, a positioning clamping part 1.2, a connecting hole 1.3, a hanging ring 1.4, a connecting sheet 2, a clamping groove 2.1, a hollow retaining wall ring body 3, a through hole 3.1, a solid retaining wall ring body 4, a lifting rope 5, a pulley lifting platform 6, a connecting seat 6.1, supporting legs 6.2, a fixed pulley hook 6.3, a single-wheel hook pulley 6.4, a manual grinding 6.5, a traction steel wire rope 6.6, a bearing steel wire rope 6.7, a triangular balance frame 7, a basic steel bar framework 8, pouring concrete 9, a circulating retaining wall ring body 10 and a lifting group 11.
Detailed Description
As shown in figures 1-6, the foundation pit bottom-expanding foundation assembled retaining wall suitable for mountain rescue recycling comprises retaining wall ring bodies 1, wherein each retaining wall ring body 1 is formed by splicing 3 arc-shaped plate pieces 1.1, and the arc-shaped plate pieces 1.1 are 5m in arc length, 8mm in thickness and 500mm in height. Each arc-shaped plate 1.1 is provided with a positioning clamping part 1.2 at left and right sides, the positioning clamping part 1.2 at one side is a groove, the positioning clamping part 1.2 at the other side is a bulge, and the groove and the bulge can be clamped. A plurality of connecting holes 1.3 are vertically arranged on the positioning clamping part 1.2. The adjacent arc-shaped plate pieces 1.1 are spliced through the positioning clamping parts 1.2 and are fixed through bolts. The upper and lower retaining wall ring bodies 1 are aligned up and down and are closely connected through connecting sheets 2.
The retaining wall ring body 1 is divided into a hollow retaining wall ring body 3, a solid retaining wall ring body 4 and a circulating retaining wall ring body 10, and the three are the same in that the center positions of the outer side walls of the three are all prefabricated with hanging rings 1.4 in advance for binding and lifting, so that the mounting or dismounting work of the assembled retaining wall is realized (the hanging rings 1.4 are connected with a hanging rope 5 to facilitate later dismounting). The three are different in that the arc-shaped plate 1.1 of the hollow retaining wall ring body 3 is provided with rectangular through holes 3.1 in equidistant hollowed-out mode, and the square is 0.4m in height and 1.5m in width, so that a constructor can carry out transverse bottom expanding engineering. The arc-shaped plate 1.1 of the solid retaining wall ring body 4 is of a solid structure. The through holes are distributed on the circulation retaining wall ring body 10.
As shown in fig. 8, the number of the hollow retaining wall ring bodies 3 is 1, and the hollow retaining wall ring bodies are arranged at the lowest end of the foundation pit. The circular holes are hollowed out at equal intervals at the lower part of the circulation retaining wall ring body 10, the radius of each hole is 50mm, and concrete can flow into the expanded foundation pit conveniently when a concrete foundation is poured at a later stage. The other stacked retaining wall ring bodies 1 are solid retaining wall ring bodies 4.
The connecting piece 2 is an H-shaped steel piece, clamping grooves 2.1 are formed in the upper portion and the lower portion of the H-shaped steel piece, and the clamping grooves 2.1 are connected with the retaining wall ring body 1 in a clamping mode and are attached to the retaining wall ring body. As shown in fig. 4-5, 12 connecting pieces 2 are uniformly distributed between each layer of the retaining wall ring body 1, and the 12 connecting pieces 2 are used for aligning and fixing the upper retaining wall ring body 1 and the lower retaining wall ring body 1.
A recyclable method for lifting and dismantling a bottom-expanding foundation pit assembled retaining wall comprises the following specific construction operations:
1. construction of pulley lifting platform 6
1. Construction of pulley support
As shown in fig. 11-12, the pulley bracket is composed of a connecting seat 6.1, a supporting leg 6.2 and a fixed pulley hook 6.3.
The connecting seat 6.1 is formed by welding two transverse steel plates with different sizes and three equal-sized vertical steel plates in advance, one sides of the three vertical steel plates are connected, the other sides of the three vertical steel plates are equidistantly separated by 120 degrees, the three vertical steel plates are welded on a larger transverse steel plate together, and the other end of the vertical steel plate is welded with a small transverse steel plate;
The center of the small transverse steel plate is welded with a fixed pulley hook 6.3 in advance, and the fixed pulley hook 6.3 is used for placing a single-wheel hook pulley 6.4.
The landing leg 6.2 is three equal length support steel pipes, and the butt joint plate has been welded in advance to three equal length support steel pipe tip, and the butt joint plate passes through the bolt and links to each other with connecting seat 6.1, and the landing leg 6.2 other end welding has the fixed plate, and the fixed plate passes through the stake nail and links to each other with ground for fixed pulley promotes the platform.
As shown in fig. 14, the side length L of the triangular balance frame in the drawing is the movable lifting height h 1, the pulley support height h 2 and the pulley support root L 4.
The movable lifting height h 1 of the pulley lifting platform is valued in a certain range, the single-side length l of the triangular balance frame is related to the radius r of the foundation pit, and the calculation formula is as follows:
considering that the height of the single-section wall protection ring body is 0.5m, the single-section wall protection ring body can be moved by hand by being separated from the ground by 0.1m, so that the movable lifting height is required to be ensured to be not less than 0.5m, and the movable range of 0.6-1 m is taken under the condition of leaving a certain margin;
The height h 2 of the pulley support is determined by the movable lifting height h 1, the included angle alpha between the support and the horizontal direction and the single side length l of the triangular balance frame, and the value of the height h 2 is (unit: m):
The pulley bracket angle alpha takes a value between 45 degrees and 75 degrees;
The pulley support root opening L 4 must be larger than the width of the foundation pit and a certain margin is reserved for upward lifting of the triangular balance frame, and the value is (unit: m):
L4＝h2 tanα
2. Installation of pulley block and triangular balance frame
And a man power reamer 6.5 is arranged in a safe distance around the foundation pit, a perforated bottom plate is welded at the bottom of the man power reamer 6.5, and the reamer is fixed on the ground through a nail pile. The 3 strands of traction steel wire ropes 6.6 which are twisted together are manually guided to sequentially pass through the manual grinding 6.5 and the single-wheel hook pulley 6.4, the traction steel wire ropes 6.6 at the side of the manual grinding 6.5 are all wound on the grinding disc, after the traction steel wire ropes 6.6 at the side of the single-wheel hook pulley 6.4 leave a margin which is the same as the length of the movable lifting height h 1, the twisted traction steel wire ropes 6.6 are dispersed into 3 strands, a plurality of windings are wound at the dispersed nodes by the steel wire ropes for reinforcement, and each dispersed traction steel wire rope 6.6 is respectively fixed at the corner points of the triangular balance frame 7. One end of the bearing steel wire rope 6.7 is fixed on the hook of the single-wheel hook pulley 6.4, and the other end is also dispersed into 3 strands and then is respectively fixed at the middle points of three sides of the triangular balance frame 7. The pulley support is manually moved to enable the centers of the single-wheel hook pulley 6.4, the triangular balance frame 7 and the foundation pit to be positioned on the same axis, and the pulley lifting platform is arranged.
The side length of the triangular balance frame 7 is equal to the side length of the triangle in the foundation pit, and the maximum lifting height is the movable lifting height of the pulley lifting platform, so that the lifting rope is always lifted simultaneously, same in length and upwards during the dismantling operation.
Hooks are welded at each corner point and the middle points of three sides of the triangular balance frame 7 and are used for being connected with a circular ring on the lifting rope 5, the traction steel wire rope 6.6 and the bearing steel wire rope 6.7.
2. Dismantling work of assembled retaining wall
When the foundation pit is poured with concrete to be semi-solidified, the assembled retaining wall ring body can be detached from top to bottom, 20 sections of assembled retaining walls are taken as an example, and every two sections of retaining wall ring bodies are taken as a lifting group.
The specific disassembly steps are as follows:
During the installation work of the retaining wall, a certain number of peg piles are driven around the foundation pit, the lifting ropes 5 of each lifting group are fixed on the peg piles and marked, firstly, the lifting ropes among different lifting groups are prevented from being mixed in the lifting and dismantling process of the retaining wall, and secondly, the lifting ropes are prevented from falling into the foundation pit carelessly in the dismantling process.
The lifting rope 5 consists of a plurality of sections of steel wire ropes and rings, and the adjacent steel wire ropes are connected through the rings. One end of the lifting rope 5 connected with the triangular balance frame 7 is connected with a circular ring in series, one end of the lifting rope 5 connected with the retaining wall ring body 1 is not connected with a circular ring in series, and the middle part is connected with a steel wire rope by the circular ring at intervals, so that the triangular balance frame 7 can be conveniently replaced in the follow-up dismantling work.
When the concrete is poured into the foundation pit and the foundation pit is cured to be semi-solidified, the assembled retaining wall ring body of the foundation pit with the expanded bottom can be detached from top to bottom, and the 20-section foundation pit is assembled for retaining walls, the detaching process is shown in fig. 8-9, the lifting ropes 5 are sequentially represented by L1, L2 and L3, and the retaining wall ring body 1 is sequentially represented by P0, P1, P2 and P3, and the standard sections in the detaching process are 2 sections.
The specific dismantling method comprises the following steps:
(1) The lifting group to be dismantled is determined, the corresponding lifting ropes 5 fixed on the nail piles are loosened, namely, firstly, 3 strands of lifting ropes L 10 on the lifting rings 1.4 of the P 19 section retaining wall ring bodies in the uppermost lifting group of the bottom-expanding foundation pit assembled retaining wall are respectively hung on the hooks of the triangular balance frame 7, the position of the triangular balance frame 7 is manually adjusted in an auxiliary mode, and the traction steel wire ropes 6.6 are tensioned by manual grinding 6.5 until the lifting ropes 5 are in a tense state;
(2) After the fact that 3 lifting ropes L 10 are in a tight state and kept vertical is confirmed, continuing to rotate a manual grinding 6.5 to stably and slowly lift the lifting group until an upper section wall protection ring body (P 20) in the lifting group is lifted from the top of the foundation pit by about 0.1m, and manually moving the P 20 wall protection ring body to the empty place around the foundation pit;
(3) Continuously rotating the manual grinding 6.5 until the lower section wall protecting ring body (P 19) in the same lifting group is lifted to be about 0.1m away from the surface of the foundation pit, manually moving the P 19 wall protecting ring body and taking down the lifting rope L 10 on the lifting ring of the P 19 wall protecting ring body and the triangular balance frame 7;
(4) The lifting group is lifted upwards, the lifting group always rotates at a constant speed, the vertical tightening state of the lifting rope is always kept, the inclination condition of the retaining wall ring body in the lifting process is avoided, the H-shaped steel connecting sheet 2 is prevented from being taken away from the original position in the lifting process and even being blocked in a channel, and therefore the semi-solidified concrete foundation is damaged;
(5) After no sundries are confirmed in the retaining wall lifting channel, hanging a lifting rope L 9 on a lifting ring of a P 17 retaining wall ring body in the next lifting group on the triangular balance frame 7, manually moving the retaining wall ring body, the lifting rope and recycling and assembling the retaining wall after the retaining wall ring body P 18、P17 is lifted to be 0.1m from the top of the foundation pit respectively;
(6) When the lifting height of the retaining wall ring body 1 is larger than the movable lifting height h 1 (h 1 is marked in fig. 14), the triangular balance frame 7 needs to be replaced halfway, as shown in fig. 10, the triangular balance frame 7 in lifting is denoted as A, the triangular balance frame 7 needing to be installed is denoted as B, and after the lifting of the A to the height h 1, the B is connected with the circular ring 5.1 on the lifting rope 5 near the top of the foundation pit in a manual auxiliary mode. And (3) taking down and fixing the bearing steel wire rope 6.7 on the A on the B, and straightening the bearing steel wire rope 6.7 at the moment.
The bearing steel wire rope 6.7 is in a loose state when reaching the maximum movable distance, and is straightened under the supporting effect only when being replaced, namely, the bearing steel wire rope 6.7 is loose when the traction steel wire rope 6.6 is straightened to bear load, and the bearing steel wire rope 6.7 is straightened to bear load when the traction steel wire rope 6.6 is not in bearing load.
(7) As shown in fig. 10, the hoist rope 5 on a is unwound, the a is separated from the hoist rope 5, the traction wire rope 6.6 is loosened by rotating the hoist in the reverse direction, the traction wire rope 6.6 moves down, and the traction wire rope 6.6 is transferred to B. And then, taking down the A, and finishing the installation of the B, so that the wall protection ring body can be lifted upwards again.
The method has the advantages that the bearing steel wire rope 6.7 is bound on the B to play a supporting role (namely, the bearing steel wire rope 6.7 is always straightened from the process of transferring the bearing steel wire rope 6.7 to the process of transferring the traction steel wire rope 6.6 to the process of replacing), so that the lifting group is prevented from descending along with the loosening of the traction steel wire rope 6.6.
(8) Repeating the steps (6) - (7) until the residual lifting height of the retaining wall ring body is smaller than the movable lifting height h 1, wherein the specific replacement process is shown in figure 6, and continuing lifting after the replacement is finished, manually moving the retaining wall ring body, lifting ropes and recycling and assembling the retaining wall.
(9) Repeating the steps (2) - (8) until all the retaining wall ring bodies above the hollow retaining wall ring body 3 and the circulating retaining wall ring body 10 are lifted out of the foundation pit, and the hollow retaining wall ring body 3 and the circulating retaining wall ring body 10 are adhered together with the foundation along with the pouring of concrete at the moment without recycling the hollow retaining wall ring body 3 and the circulating retaining wall ring body 10.
(10) And after the steps are finished, backfilling soil into the retaining wall channel, and compacting the soil by using a compacting tool. And (5) finishing the dismantling work of the assembled retaining wall after the engineering inspection is qualified.
The wall guard is dismantled and is worked in order to guarantee going on smoothly, and the assembled wall guard of expanded base foundation ditch needs to carry out surface smoothing when production, reduces the burr on wall guard ring body surface, increases smoothness, simultaneously before carrying out concrete placement, need evenly scribble release agent at assembled wall guard internal surface, prevents concrete after pouring and wait to promote to dismantle assembled wall guard bonding together.
3. Post-treatment and wall protection maintenance treatment of construction site
After the wall protection dismantling work is finished, post-treatment is required to be carried out on the construction site.
The post-treatment comprises the dismantling work of the retaining wall ring body, and the solid retaining wall ring body is composed of 3 solid arc-shaped plate pieces, so that the carried retaining wall ring body also needs to be dismantled further, a constructor removes bolts by using a spanner, and the retaining wall ring body is dismantled into arc-shaped plate pieces before being assembled and stacked together;
The post-treatment comprises the recovery of auxiliary connecting pieces, the counting of the number of bolts and H-shaped steel connecting pieces, the omission of the bolts and the H-shaped steel connecting pieces on a construction site is avoided, and meanwhile, the use condition of the auxiliary connecting pieces is checked, and if a damage phenomenon occurs, the auxiliary connecting pieces are replaced in time. After counting, the auxiliary connecting piece is stored in the tool box, so that the auxiliary connecting piece is convenient to recycle;
The post-finishing work comprises the steps of dismantling a pulley lifting platform, loosening a traction steel wire rope wound on a millstone, taking down a triangular balance frame, the connected traction steel wire rope and a bearing steel wire rope from the pulley side, dismantling a fixed pulley support and a manually-reamed nail pile in sequence, storing and finishing all traction, dismantling and bearing steel wire ropes, recovering the manually-reamed nail pile and a single-wheel lifting hook pulley, and loading and transporting.
The wall protection maintenance treatment comprises the cleaning of arc-shaped plate, and the dismantling work is to smear a release agent on the surface of the aluminum magnesium alloy to avoid the mutual adhesion of the wall protection and the cast-in-place concrete, so that the release agent attached to the surface of the wall protection is required to be cleaned before storage, namely the recovered arc-shaped plate is evenly washed by a cleaning agent and then washed by clear water for a plurality of times.
Claims (9)
1. A recyclable method for lifting and dismantling a bottom-expanding foundation pit assembled retaining wall comprises the following steps:
step one, completing installation and construction of a pulley lifting platform (6) and a triangular balance frame (7);
Step two, taking n sections of wall protection ring bodies as a lifting group, binding 3 strands of lifting ropes (5) which are arranged on the lifting group at the uppermost layer and are positioned at the lifting rings (1.4) of the wall protection ring bodies (1) at the bottom end of the lifting group on corner points of a triangular balance frame (7) respectively, binding 3 strands of bearing steel wire ropes (6.7) which are positioned at the single-wheel hook pulley (6.4) on the middle points of three sides of the triangular balance frame (7), manually assisting in adjusting the positions of the triangular balance frame (7), and manually grinding (6.5) to tighten and straighten the traction steel wire ropes (6.6) until the lifting ropes (5) are tensioned;
Step three, after determining that 3 strands of lifting ropes (5) are in a vertical tightening state, continuing to rotate the manual grinding (6.5) to stably and slowly lift until the upper end wall protection ring body (1) in the uppermost lifting group is 0.1-0.2 m away from the top of the foundation pit, manually moving the upper end wall protection ring body (1) in the lifting group to a nearby empty place, continuing to rotate the manual grinding (6.5), and taking down the lower end wall protection ring body (1) in the lifting group and unwinding the lifting ropes (5);
Step four, checking whether the connecting sheet (2) is carried out of position or even clamped in the channel in the lifting process, and if so, cleaning the connecting sheet (2) out of the channel in advance by using a magnet to avoid damaging a semi-solidified concrete foundation in the lifting process;
step five, after the channel cleaning is confirmed, binding 3 strands of lifting ropes (5) of the next lifting group at the lifting rings (1.4) of the wall protection ring bodies (1) at the bottom end of the lifting group on a triangular balance frame (7) respectively, repeating the step three, and manually transporting the upper wall protection ring bodies (1) of the lifting group to a nearby empty place when the uppermost wall protection ring body (1) of the lifting group is separated from the top of a foundation pit by 0.1-0.2 m;
Step six, when the lifting height of the lifting group is larger than the maximum lifting height of the lifting device, the triangular balance frame (7) needs to be replaced halfway, when the triangular balance frame (7) in lifting is lifted to the maximum lifting height, the triangular balance frame (7) needing to be installed is manually assisted to be connected with a circular ring on the lifting rope (5) close to the top of the foundation pit, the bearing steel wire rope (6.7) on the triangular balance frame (7) in lifting is taken down and fixed on the triangular balance frame (7) needing to be installed, the lifting rope (5) on the triangular balance frame (7) in lifting is unwound, the triangular balance frame (7) in lifting is separated from the lifting rope (5), then the traction steel wire rope (6.6) fixed on the triangular balance frame (7) in lifting is transferred to the triangular balance frame (7) needing to be installed, and at the moment, the triangular balance frame (7) in lifting is taken down, the triangular balance frame (7) needing to be installed is installed, and the wall protection is lifted upwards again;
step seven, repeating the step six until the residual lifting height of the lifting group is smaller than the movable lifting height, and then lifting and recycling the lifting group to assemble the retaining wall;
step eight, repeating the step two to the step seven until all the retaining wall ring bodies (1) except the hollow retaining wall ring body (3) and the circulating retaining wall ring body (10) are lifted out of the foundation pit, and the hollow retaining wall ring body (3) and the circulating retaining wall ring body (10) are adhered together with the foundation along with the pouring of concrete at the moment so as to strengthen the bearing capacity of the foundation, so that the foundation cannot be recycled;
Step nine, backfilling soil body into the retaining wall channel after the steps are finished, and compacting the soil body by using a tamping tool;
And step ten, after the wall protection dismantling work is finished, post-treatment is required to be carried out on the construction site.
2. The method for lifting and dismantling the assembled retaining wall of the recyclable expanded foundation pit according to claim 1, wherein a certain number of peg piles are driven around the foundation pit before dismantling, and the lifting ropes (5) of all lifting groups are bound on the peg piles and marked.
3. The method for lifting and dismantling the assembled retaining wall of the recyclable expanded foundation pit, which is characterized in that in the first step, the movable lifting height of a pulley lifting platform (6) is h 1, the single side length l of a triangular balance frame is related to the radius r of the foundation pit, and the calculation formula is as follows:
Considering that the height of the single-section wall protection ring body is 0.5m, the single-section wall protection ring body can be moved by hand by being separated from the ground by 0.1m, so that the movable lifting height is required to be ensured to be not less than 0.5m, h 1 is 0.6-1 m under the condition of leaving a certain margin, the angle alpha of the pulley bracket is 45-75 degrees, the height h 2 of the pulley bracket is determined by the movable lifting height h 1 and the included angle alpha of the pulley bracket and the horizontal direction, and the calculation formula of h 2 is as follows:
Because the pulley bracket root opening L 4 must be larger than the width of the foundation pit and a certain margin is reserved for upward lifting of the triangular balance frame, the calculation formula of L 4 is as follows:
。
4. The method for lifting and dismantling the recyclable bottom expanding foundation pit assembled retaining wall is characterized in that the pulley lifting platform (6) comprises a connecting seat (6.1), the lower end of the connecting seat (6.1) is supported and fixed through a supporting leg (6.2), a fixed pulley hook (6.3) is arranged at the center of the connecting seat (6.1), the fixed pulley hook (6.3) is used for hanging a single-wheel hook pulley (6.4), a personal grinder (6.5) is arranged on the corresponding ground, one end of a traction steel wire rope (6.6) is arranged on the personal grinder (6.5), the other end of the traction steel wire rope bypasses a pulley of the single-wheel hook pulley (6.4) and is then fixed on a triangular balance frame (7), the bearing steel wire rope (6.7) is arranged on a hook of the single-wheel hook pulley (6.4), and the other end of the bearing steel wire rope (6.7) is fixed at the midpoint position of the triangular balance frame (7).
5. The method for lifting and dismantling the assembled retaining wall of the recyclable expanded foundation pit is characterized in that the retaining wall ring body (1) in the second step comprises arc-shaped plate pieces (1.1), the plurality of arc-shaped plate pieces (1.1) are spliced into the retaining wall ring body (1), hanging rings (1.4) are arranged on the outer side of each retaining wall ring body (1), the hanging rings (1.4) are connected with hanging ropes (5), the hanging ropes (5) extend out of the foundation pit, and the plurality of sections of retaining wall ring bodies (1) are aligned up and down and are tightly connected through connecting pieces (2) in sequence to form a retaining wall main body.
6. The method for lifting and dismantling the assembled retaining wall of the recyclable expanded foundation pit, as set forth in claim 5, is characterized in that the left and right arc-shaped plate (1.1) is provided with positioning clamping parts (1.2), the positioning clamping parts (1.2) are provided with connecting holes (1.3), and adjacent arc-shaped plate (1.1) are spliced through the positioning clamping parts (1.2) and locked through bolts.
7. The method for lifting and dismantling the assembled retaining wall of the recyclable expanded foundation pit, as set forth in claim 5, is characterized in that the arc-shaped plate (1.1) is made of an aluminum magnesium alloy material.
8. The method for lifting and dismantling the assembled retaining wall of the recyclable bottom-expanded foundation pit, which is disclosed in claim 5, is characterized in that at least one perforation (3.1) is distributed on the side wall of a section of retaining wall ring body (1) at the lowest end, the perforation (3.1) is used for a constructor to carry out a horizontal bottom-expanded engineering, and a drainage hole (3.2) is arranged on a section of retaining wall ring body (1) adjacent to the retaining wall ring body (1) with the perforation (3.1).
9. The method for lifting and dismantling the assembled retaining wall of the recyclable expanded foundation pit, as set forth in claim 5, is characterized in that the lifting rope (5) consists of a plurality of sections of steel wire ropes and circular rings, and the adjacent steel wire ropes are connected through the circular rings.
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| CN208413709U (en) * | 2018-07-03 | 2019-01-22 | 中建一局集团第六建筑有限公司 | Unit type glass curtain wall double-ring track hoisting system |
| CN217460557U (en) * | 2022-05-31 | 2022-09-20 | 中国十七冶集团有限公司 | Manual hole digging pile casing device for drift sand geology |
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| CN213265487U (en) * | 2020-09-22 | 2021-05-25 | 杨敬宏 | Municipal construction is with hanging material haulage equipment |
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| CN208413709U (en) * | 2018-07-03 | 2019-01-22 | 中建一局集团第六建筑有限公司 | Unit type glass curtain wall double-ring track hoisting system |
| CN217460557U (en) * | 2022-05-31 | 2022-09-20 | 中国十七冶集团有限公司 | Manual hole digging pile casing device for drift sand geology |
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