Construction method for dismantling and backfilling premixed flow-state solidified soil and supporting beam in deep foundation pit
Through the construction method of reinstatement and recovery of support beams in the pre -mixed -mixed -mixed -mixed darbone and deep -founding pits, the construction quality of the traditional recovery method in the deep -founded pit project is difficult to ensure, the cost is difficult to control and the safety risk. Safe and economy backfilling effect.
Patent Information
- Application Number
- CN202411553486.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-02
- Publication Date
- 2025-01-24
AI Technical Summary
In deep foundation pit projects, due to the deep foundation pit and narrow fertilizer trough, the traditional backfill method has problems such as difficult to ensure construction quality, difficult to control costs and high safety risks.
The construction method of disassembling recovery and recovery of pre -mixed -mixed -mixed -mixed -mixed -mixed damp solidation soil and deep -founded pits. Through the combination of embedded slot steel and sleeve, static cutting and tower crane, work steel and opening steel Backfill.
This method can improve construction quality and safety, reduce construction costs, reduce personnel risks of basic pit operation, and improve the overall stability of the deep -founded pit project.
Smart Images
Figure CN119352536A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of foundation pit backfilling, and in particular to a construction method for dismantling and backfilling premixed fluidized solidified soil and support beams in a deep foundation pit. Background Art
[0002] With the acceleration of urbanization, various high-rise buildings, underground transportation hubs, and large underground commercial facilities are emerging, and the scale and complexity of deep foundation pit projects are increasing. As the basic guarantee for the construction of these underground structures, the stability and safety of deep foundation pits are extremely important.
[0003] Traditional deep foundation pit backfill uses 2:8 ash soil for backfilling. The traditional method has great disadvantages for projects with narrow fertilizer troughs and internal support beams. First, it is difficult to guarantee the construction quality, and personnel cannot go down to the deep foundation pit to compact the soil layer by layer. Second, it is difficult to control the construction cost, and it is necessary to use manual labor and machinery to slowly transport the soil to the foundation pit. Third, it is difficult to control the safety target. The deep foundation pit is a limited space and is not convenient for construction. If the traditional construction process is used, it is difficult to avoid the safety of fertilizer trough personnel. Summary of the invention
[0004] In view of the shortcomings of the prior art, the present invention provides a construction method for dismantling and backfilling premixed fluidized solidified soil and supporting beams in deep foundation pits, which solves the problems of deep foundation pits, narrow fertilizer troughs, inconvenient transportation after dismantling of internal supporting beams, safety of construction personnel and cost savings.
[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: A construction method for dismantling and backfilling premixed fluidized solidified soil and support beams in a deep foundation pit, comprising the following steps: Step 1: When constructing the inner support beam, bury the embedded channel steel to the bottom of the beam, and leave the embedded casing processed in advance for the later pouring of premixed fluidized solidified soil; Step 2: When the construction reaches the fifth underground floor, the inner supporting concrete blocks are cut statically. After cutting, they are hoisted by a tower crane and hoisted to the floor slab; Step 3: After the exterior wall formwork is removed and waterproofing is completed, the concrete blocks are hoisted into a wheelbarrow using a tower crane, and are manually pushed to the fertilizer tank backfill area, and the I-beam is inserted into the originally reserved channel steel area; Step 4: To ensure the effective connection between the I-beam and the open steel, full welding is used to weld to the bottom of the I-beam to form an inverted hang; Step 5: After all the preparations are completed, the concrete blocks are transported. The tower crane is used to lift the inner support concrete blocks into a trolley, which is manually pushed to the fertilizer tank backfilling area, and then the inner support concrete blocks are tied to the wire rope; Step 6: After the inner support beam construction phase is completed, the conduit is installed. Round holes are reserved on the support beams. The conduit is lowered into the holes. The upper part of the inner support beam is fixed with a clamp to prevent the conduit from deviating or being damaged during pouring.
[0006] Preferably, in step one, the embedded depth of the embedded channel steel is 3-5 meters as a spacing, wherein the embedded channel steel adopts 350×250×80mm steel components, the embedded length is 200mm, the processed channel steel thickness is 80mm, the retention interval of the embedded casing is 20 meters, wherein the embedded casing adopts a 150mm diameter finished casing, which is embedded during the pouring of concrete of the inner support beam.
[0007] Preferably, in step 2, the cutting size of the inner supporting concrete blocks is 1000×1200 mm.
[0008] Preferably, in step three, 1 meter is reserved on each side of the I-beam length, wherein 22# I-beam can be a finished product, and the length is controlled within 12 meters. Since the spacing between the embedded parts of the channel steel is 10 meters, there must be margin on both sides after the channel steel is inserted.
[0009] Preferably, in step 4, the thickness of the open steel is also 80 mm, the open steel is hung upside down, and the contact surface with the I-beam is fully welded, and a pulley and a wire rope are placed inside the open steel for construction workers to pull the wire rope to move.
[0010] Preferably, in step five, the construction workers use the open steel inner pulley and wire rope to pull the fertilizer trough backfill to the fertilizer trough and arrange it neatly. The entire fertilizer trough is lifted in sections, and multiple shifts can be used for transportation.
[0011] Preferably, in step six, the reserved diameter of the circular hole of the support beam is 150 mm in diameter, the conduit is a processed UPVC conduit with a diameter of 125 mm, the size types are 500 mm, 1000 mm, 1500 mm, 2500 mm, and the elbows are 90° and 135°.
[0012] Preferably, in step six, the conduit is used for later pouring of premixed fluidized solidified soil.
[0013] The present invention provides a construction method for dismantling and backfilling premixed fluidized solidified soil and supporting beams in a deep foundation pit. It has the following beneficial effects: 1. The present invention is based on the transportation of construction waste and the utilization of construction waste after the removal of the concrete inner support beams at the construction site. The removal of the inner support as construction waste will generate transportation costs, and the concrete blocks removed by the tower crane at the construction site will reduce the working efficiency of other labor forces at the construction site, indirectly increasing labor costs and machinery costs. The use of concrete block waste for the construction foundation pit can save the amount of premixed fluidized solidified earthwork, which will save an expense on the backfill cost. In addition, the fertilizer trough of deep foundation pit engineering generally has limited space. Compared with gray soil backfilling, this method can reduce the operating risk of personnel going down to the foundation pit, and greatly improves the safety risk control. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 A perspective view of the present invention; Figure 2 It is a schematic diagram of the embedded steel channel of the present invention; Figure 3 It is a schematic diagram of tower crane hoisting of the present invention; Figure 4 It is a partial schematic diagram of the tower crane of the present invention; Figure 5 It is a schematic cross-sectional view of an I-beam of the present invention; Figure 6 It is an inverted schematic diagram of the present invention; Figure 7 It is a schematic diagram of welding the opening steel and the I-beam of the present invention; Figure 8 It is a schematic diagram of the integral embedded part of the present invention; Fig. 9 is a schematic diagram of a catheter of the present invention; Fig.10 It is a schematic diagram of conduit casting of the present invention; Fig.11 This is a schematic diagram of the distribution of reserved holes for embedded parts of the present invention.
[0015] Among them, 1. Internal support beam; 2. Embedded channel steel; 3. Open steel; 4. I-beam; 5. Pulley; 6. Wire rope. DETAILED DESCRIPTION
[0016] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example
[0017] Please see attached Figure 1 -Attached Fig.11The embodiment of the present invention provides a construction method for dismantling and backfilling premixed fluidized solidified soil and supporting beams in a deep foundation pit, comprising the following steps: Step 1: When constructing the inner support beam 1, the embedded channel steel 2 is buried at the bottom of the beam, and the embedded casing processed in advance is retained for the later pouring of premixed fluidized solidified soil; Step 2: When the construction reaches the fifth underground floor, the inner supporting concrete blocks are cut statically. After cutting, they are hoisted by a tower crane and hoisted to the floor slab; Step 3: After the exterior wall formwork is removed and waterproofing is completed, the concrete blocks are hoisted into a wheelbarrow using a tower crane, and are manually pushed to the fertilizer tank backfilling area, and the reserved channel steel portion is inserted into the I-beam 4; Step 4: To ensure that the I-beam 4 is effectively connected to the open steel, full welding is used to weld to the bottom of the I-beam 4 to form an inverted hang; Step 5: After all the preparations are completed, the concrete blocks are transported. The tower crane assists in lifting the inner support concrete blocks into a trolley, and pushes them to the fertilizer tank backfill by manual means, and then ties the inner support concrete blocks to the steel wire rope 6; Step 6: After the construction phase of the inner support beam 1 is completed, the conduit is installed. Round holes are reserved on the support beams. The conduit is lowered into the hole. The upper part of the inner support beam 1 is fixed with a clamp to prevent the conduit from deviating or being damaged during pouring.
[0018] In step one, the embedded depth of the embedded channel steel 2 is 3-5 meters as a spacing, wherein the embedded channel steel 2 adopts a 350×250×80mm steel component, the embedded length is 200mm, the processed channel steel thickness is 80mm, and the retention interval of the embedded casing is 20 meters, wherein the embedded casing adopts a 150mm diameter finished casing, which is embedded during the concrete pouring of the inner support beam 1.
[0019] Specifically, for the embedded channel steel 2, the embedded depth is 3-5 meters at intervals, and a 350×250×80mm steel member is used, the embedded length is 200mm and the thickness of the processed channel steel is 80mm. This arrangement has a significant advantage in terms of structural stability. It can greatly enhance the bearing capacity of the inner support beam 1 in a deep foundation pit environment, effectively resist the forces from the surrounding soil pressure, upper building loads, etc., so that the inner support beam 1 can maintain a stable state during construction, reduce the occurrence of structural deformation, cracks and other problems caused by uneven or excessive force, thereby providing a safer and more reliable working environment for construction personnel and equipment in the deep foundation pit; Moreover, in the subsequent demolition and backfilling process, the embedded channel steel 2 also plays an important role. For example, when the static cutting and lifting operation of the inner supporting concrete block is carried out on the fifth underground floor, the embedded channel steel 2 can serve as a reliable connection support, so that the tower crane can smoothly lift the cut concrete block to the floor slab, ensuring the efficient and orderly progress of the demolition work. At the same time, in the subsequent operations such as the backfilling of the fertilizer tank, the embedded channel steel 2 can also cooperate with the inserted I-beam 4 and other components, further improving the integrity and stability of the entire structure during the backfilling process; As for the embedded casing, the interval between them is 20 meters. The finished casing with a diameter of 150mm is used and it is embedded when the concrete of the inner support beam 1 is poured. The beneficial effects brought by it are mainly reflected in the pouring of premixed fluidized solidified soil. Due to the reasonable arrangement of the embedded casing, when pouring the premixed fluidized solidified soil, the solidified soil can flow accurately and smoothly along these pre-set channels (i.e. embedded casing) to the parts that need to be filled, ensuring the uniformity and integrity of the solidified soil filling. This can not only effectively improve the reinforcement effect of the premixed fluidized solidified soil on areas such as fertilizer trough backfill, and enhance the stability of the surrounding structures of the deep foundation pit, but also reduce the subsequent quality problems that may be caused by uneven filling of solidified soil, such as local settlement, thereby ensuring the construction quality and long-term performance of the entire deep foundation pit project.
[0020] In step 2, the cutting size of the inner support concrete block is 1000×1200mm.
[0021] Specifically, during construction, specific channel steel and casing are embedded at the bottom of the inner support beam 1 to prepare for the pouring of solidified soil. When it reaches the fifth underground floor, the inner support concrete blocks cut into a size of 1000×1200mm are statically cut and hoisted by a tower crane. After the construction of the exterior walls is completed, the concrete blocks are hoisted to the backfill of the fertilizer trough and inserted into the I-beam 4 for welding. A conduit is also installed for the subsequent pouring of solidified soil. The various steps of this method are closely coordinated to ensure safe and efficient construction and the stability of the deep foundation pit structure.
[0022] In step three, 1 meter is reserved on each side of the I-beam 4, of which 22# I-beam 4 can be a finished product, and the length is controlled within 12 meters. Because the spacing between the embedded parts of the channel steel is 10 meters, there must be a margin on both sides after the channel steel is inserted.
[0023] Specifically, a 22# finished I-beam 4 is used, the length of which is controlled within 12 meters, and 1 meter is reserved on each side. Since the spacing between the embedded parts of the channel steel is 10 meters, the reserved margin can ensure that the I-beam 4 can be smoothly inserted into the channel steel, which is convenient for construction operations, reduces the difficulty of insertion, and improves efficiency. At the same time, the reserved margin can also play a buffering and regulating role when encountering external forces, structural deformation, etc., to ensure that the I-beam 4 is tightly connected to the channel steel and maintain structural stability.
[0024] In step 4, the thickness of the open steel is also 80 mm. The open steel is hung upside down and the contact surface with the I-beam 4 is fully welded. A pulley 5 and a wire rope 6 are placed inside the open steel for construction workers to pull the wire rope 6 to move.
[0025] Specifically, the thickness of the open steel section is 80 mm, and it is connected to the I-beam 4 in an inverted manner. The contact surface is fully welded to ensure stability. Pulleys 5 and wire ropes 6 are placed on the inside. Construction workers can pull the wire ropes 6 to move related components. This arrangement can not only enhance the stability of the structure and enable the components to be tightly connected to bear the load, but also facilitate construction operations, reduce the difficulty of manual pulling, effectively improve construction efficiency, and ensure the smooth progress of the entire construction process.
[0026] In step five, at the backfilling part of the fertilizer trough, the construction workers use the pulley 5 inside the opening steel 3 and the steel wire rope 6 to pull and move the fertilizer trough into the fertilizer trough and arrange them neatly. The whole section of the fertilizer trough is lifted in sections, and multiple shifts can be used for transportation.
[0027] Specifically, the arrangement of the fertilizer tank backfill has a specific operation method. The construction workers use the pulley 5 and the wire rope 6 inside the open steel to realize the movement of the components. The principle is that the pulley 5 can effectively reduce the friction force, so that the construction workers can drive the components to move with a relatively small force when pulling. After the relevant components are pulled and moved into the fertilizer tank, they are arranged neatly through manual operation to prepare for subsequent construction. For the entire fertilizer tank, due to its large area, the use of segmented lifting can better coordinate the construction progress of each part, and arranging multiple teams for transportation is based on the balance of manpower and construction efficiency. Different teams can carry out operations on different sections at the same time to achieve an efficient and orderly construction process; At the fertilizer trough backfill, construction workers use the pulley 5 and wire rope 6 inside the opening steel 3 to pull and move the parts into the fertilizer trough and arrange them neatly. The entire section of the fertilizer trough is lifted in sections and transported by multiple teams, which brings many beneficial effects. First of all, the use of pulley 5 and wire rope 6 to pull and move parts is convenient and labor-saving, and the parts can be quickly and neatly placed in the fertilizer trough, saving time and labor costs. Secondly, the segmented lifting and multi-team transportation mode greatly improves the construction efficiency and shortens the construction period of the fertilizer trough backfill. At the same time, multi-team operations can ensure the consistency of the construction quality of each section, ensure the quality of the entire fertilizer trough backfill project, and lay a good foundation for the smooth progress of subsequent deep foundation pit related projects.
[0028] After step five, proceed as follows: After the concrete blocks are hoisted, slowly move the I-beam 4 and the pulley 5 into other embedded channel steels 2 without disassembly, and carry out the hoisting work of the next section. After the entire floor is completed, place it in the warehouse, and repeat the above steps when the next floor is backfilled.
[0029] Specifically, during the dismantling and backfilling construction of the premixed fluidized solidified soil and the support beam 1 in the deep foundation pit, the construction workers at the fertilizer trough backfilling site use the pulley 5 and wire rope 6 inside the open steel to pull the components to the fertilizer trough and arrange them neatly. The entire fertilizer trough is lifted in sections and transported by multiple shifts. After lifting the concrete blocks, the I-beam 4 and the pulley 5 are pushed into other embedded channel steels 2 without disassembly for lifting to the next section. The entire layer is completed and placed in the warehouse, and the above steps are repeated when the next layer is backfilled. This not only facilitates operation and saves costs, but also improves efficiency and quality, and ensures smooth progress of construction.
[0030] In step 6, the reserved diameter of the circular hole of the support beam is 150mm, the conduit is processed UPVC conduit, the diameter is 125mm, the size type is 500mm, 1000mm, 1500mm, 2500mm, the elbow is 90°, 135° elbow. The conduit is used for the later pouring of premixed fluidized solidified soil.
[0031] Specifically, during the demolition and backfilling construction of premixed fluidized solidified soil and support beam 1 in the deep foundation pit, a 150mm diameter circular hole is reserved in the support beam, and a processed UPVC conduit with a diameter of 125mm is used. There are 500mm, 1000mm, 1500mm, 2500mm and other size types, and 90° and 135° elbows are also equipped. The conduit is used for the later pouring of premixed fluidized solidified soil. It can be firmly installed through the circular hole, and different sizes and elbows can be flexibly selected as needed, so as to accurately guide the solidified soil to flow to the predetermined position according to the construction site layout and pouring path requirements, and ensure the smooth progress of the pouring work.
[0032] After step 6, the premixed fluidized solidified soil is poured. After all the work is completed, the premixed fluidized solidified soil is poured. After the pouring is completed, the construction processes of the fourth underground floor and the third underground floor are carried out. After the construction is completed, the fertilizer tank is backfilled and the above work content is repeated; Specifically, when all the work is ready, the pouring of premixed fluidized solidified soil will be carried out. After the pouring is completed, the construction processes of the fourth underground floor and the third underground floor will be carried out. After these constructions are completed, the fertilizer trough backfilling stage will be entered. At this time, a series of related work contents will be repeated, including the pre-embedded channel steel 2 and casing during the construction of the internal support beam 1, the static cutting and lifting of the concrete blocks for the fifth underground floor, the lifting of the concrete blocks to the fertilizer trough backfilling location after the exterior wall construction and the insertion of I-beams 4, etc. This will be carried out in an orderly manner according to the process to ensure the smooth completion of the entire dismantling and backfilling construction of the premixed fluidized solidified soil and the support beam 1 in the deep foundation pit.
[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A construction method for dismantling and backfilling premixed fluidized solidified soil and supporting beams in a deep foundation pit, characterized in that: The following steps are involved: Step 1: When constructing the inner support beam, the embedded channel steel (2) is embedded at the bottom of the beam, and the embedded casing processed in advance is retained for the later pouring of premixed fluidized solidified soil; Step 2: When the construction reaches the fifth underground floor, the inner supporting concrete blocks are cut statically. After cutting, they are hoisted by a tower crane and hoisted to the floor slab; Step 3: After the exterior wall formwork is removed and waterproofing is completed, the concrete blocks are hoisted into a wheelbarrow using a tower crane and manually pushed to the fertilizer tank backfill location, and the I-beam (4) is inserted into the originally reserved channel steel portion. Step 4: To ensure that the I-beam (4) is effectively connected to the open steel, full welding is used to weld to the bottom of the I-beam (4) to form an inverted shape; Step 5: After all preparations are completed, the concrete blocks are transported. The tower crane is used to lift the inner support concrete blocks into a trolley, which is manually pushed to the fertilizer tank backfilling location, and then the inner support concrete blocks are tied to the steel wire rope (6); Step 6: After the construction of the inner support beam (1) is completed, the conduit is installed. A circular hole is reserved on the support beam, and the conduit is lowered into the hole. The upper part of the inner support beam (1) is fixed with a clamp to prevent the conduit from deviating or being damaged during pouring.
2. A construction method for dismantling and backfilling premixed fluidized solidified soil and supporting beams (1) in a deep foundation pit according to claim 1, characterized in that: In step 1, the embedded depth of the embedded channel steel (2) is 3-5 meters as the interval, wherein the embedded channel steel (2) adopts a 350×250×80mm steel member, the embedded length is 200mm, the thickness of the processed channel steel is 80mm, the retention interval of the embedded casing is 20 meters, wherein the embedded casing adopts a 150mm diameter finished casing, and is embedded when the inner support beam (1) is poured with concrete.
3. A construction method for dismantling and backfilling premixed fluidized solidified soil and supporting beams (1) in a deep foundation pit according to claim 1, characterized in that: In step 2, the cutting size of the inner support concrete block is 1000×1200mm.
4. The construction method of premixed fluidized solidified soil and support beam removal and backfilling in a deep foundation pit according to claim 1, characterized in that: In step 3, 1 meter is reserved on each side of the I-beam (4), wherein the 22# I-beam (4) can be a finished I-beam (4), and the length is controlled within 12 meters. Since the spacing between the embedded channel steel parts is 10 meters, there must be a margin on both sides after the channel steel is inserted.
5. The construction method of premixed fluidized solidified soil and support beam removal and backfilling in a deep foundation pit according to claim 1, characterized in that: In step 4, the thickness of the open steel is also 80 mm, the open steel is hung upside down, and the contact surface with the I-beam (4) is fully welded. A pulley (5) and a steel wire rope (6) are placed inside the open steel for construction workers to pull the steel wire rope (6) to move.
6. The construction method of premixed fluidized solidified soil and support beam removal and backfilling in a deep foundation pit according to claim 1, characterized in that: In step 5, the construction workers use the inner pulley (5) and wire rope (6) of the open steel (3) to pull the fertilizer trough backfill to the fertilizer trough and arrange it neatly. The entire section of the fertilizer trough is lifted in sections and can be transported by multiple shifts.
7. The construction method of premixed fluidized solidified soil and support beam removal and backfilling in a deep foundation pit according to claim 1, characterized in that: In step six, the reserved diameter of the circular hole of the support beam is 150mm. The conduit is a processed UPVC conduit with a diameter of 125mm. The size types are 500mm, 1000mm, 1500mm, and 2500mm, and the elbows are 90° and 135°.
8. The construction method of premixed fluidized solidified soil and support beam removal and backfilling in a deep foundation pit according to claim 1, characterized in that: In step six, the conduit is used for the later pouring of premixed fluidized solidified soil.