Method for constructing cement-soil reinforced wall by applying prestress in mixed mode

Abstract

The invention discloses a method for constructing a cement-soil reinforced wall by applying prestress in a mixed manner, which comprises the following steps of: firstly, predicting and selecting an address, setting a plurality of crossed earth surface planning lines on the basis of a predicted geographic position, and generating an earth surface planning block diagram with a plurality of grids, so as to conveniently search crisscrossed points subsequently; and driving and controlling a plurality of fixed pile bodies to sink into the predicted geographic position according to the presented cross points in a multi-grid earth surface planning block diagram to form a preliminary shape. Then, a plurality of solid walls are erected on the earth surface of the predicted geographic position through intervals among the multiple fixed piles to form a foundation and enclosing walls, the enclosing walls form a net-shaped body, and finally, a terrace is poured on the top faces of the solid walls, so that a multidirectional terrace stress structure with the middle provided with upward sinking control fixed pile supports is formed. The method is used for solving the technical problems of terrace cracks and subsidence caused by poor settlement due to improper treatment when the soil texture of a foundation of a construction site is complex and weak.

Description

Technical Field

[0001] The invention relates to the technical field of reinforced wall construction, and in particular to a method for constructing a prestressed cement-soil reinforced wall. Background Art

[0002] These new, large-scale industrial parks are often built on complex sites, such as coastal mudflats, river and pond ditch fills, mountain reclamation sites, mountain ditch fills, and high-fill sites. Furthermore, due to the demands of production processes, the factory floors will bear certain loads, and these loads are increasing. Furthermore, modern production plants require increasingly stringent control over floor settlement, and uneven settlement of the factory floor can seriously impact the normal operation of the entire production line. Long piles are typically driven under the structural columns to strictly control settlement, while the floor beneath is typically backfilled to the designed floor elevation and reinforced. However, this often fails to effectively control ground subsidence. Therefore, long piles are often used to support cast-in-place reinforced concrete beam-slab floors. When the construction site's foundation soil is complex and weak, the construction of industrial factory floors is inherently expensive. Furthermore, improper management can still lead to differential settlement, resulting in floor cracks and subsidence, disrupting normal industrial production. Therefore, optimizing the foundation beneath these large industrial plant floors is one of the most challenging aspects of geotechnical engineering today. Furthermore, large sites such as factory product storage yards, residential plazas, supermarket floors, container terminal yards, and large locomotive transfer sites also face the problem of subsidence caused by floor construction. Summary of the Invention

[0003] The purpose of the present invention is to provide a method for constructing a mixed prestressed cement-soil reinforced wall to solve the technical problem that when the foundation soil of a construction site is complex and weak, improper treatment will cause settlement differences, resulting in floor cracks and subsidence.

[0004] The technical solution of the present invention is achieved as follows:

[0005] A method for constructing a prestressed cement-soil reinforced wall comprising:

[0006] Step S1: Based on the predicted geographical location, multiple intersecting surface planning lines are set to generate a surface planning frame diagram with multiple grids;

[0007] Step S2: driving and controlling a plurality of fixed piles into the predicted geographical location according to the intersections in the multi-grid surface planning diagram;

[0008] Step S3: constructing multiple solid walls on the ground surface of the predicted geographical location by using the intervals between the multiple fixed piles;

[0009] Step S4: pouring the floor on the top surfaces of the multiple solid walls to form a multi-directional floor force-bearing structure with the fixed piles in the middle supporting the upward sinking.

[0010] A further technical solution is that step S1 specifically includes:

[0011] Step S11: obtaining information on the geological softness, horizontal height, and surface structure of the site to be constructed, and generating the predicted geographical location;

[0012] Step S12: dividing the predicted geographical location into a plurality of areas to be marked;

[0013] Step S13, setting a plurality of cross-surface planning lines according to the predicted geographical locations corresponding to the plurality of areas to be marked;

[0014] Step S14: differentiating multi-shape planning maps according to the intersecting surface planning lines;

[0015] Step S15: Incorporate the multi-shape planning diagrams into an information table to generate the multi-grid surface planning diagram.

[0016] A further technical solution is that in step S2, the fixed pile body includes a first fixed pile body and a second fixed pile body, which specifically includes:

[0017] Step S21, determining the intersection control selection according to the soil layer distribution, soil properties, floor load and floor structure of the predicted geographical location;

[0018] Step S22: according to the intersection control selection, control the first fixed pile or the second fixed pile.

[0019] A further technical solution is that the step S22 includes:

[0020] Step S221: using a multi-material mixture or a single material to make a first pre-treated pile body, converting the pre-treated pile body into the first fixed pile body, and driving and controlling the first fixed pile body according to the intersection driving and control selection;

[0021] Step S222: using the single material to make a second pre-treated pile body, converting the second pre-treated pile body into a second fixed pile body, and driving and controlling the second fixed pile body according to the intersection driving and control selection;

[0022] Step S223: In step S221, based on the site conditions selected for the intersection control, preselect the first fixed pile body with a length suitable for the site conditions.

[0023] A further technical solution is that step S3 specifically includes:

[0024] Step S31: obliquely implanting a first reinforcing core rod into the solid wall formed by stirring, so that when the solid wall solidifies, a reinforced solid wall with cross-reinforcing core rods implanted therein is formed;

[0025] Step S32: Based on the reinforced solid wall, a second reinforcing core rod is implanted into the fixed pile body at the intersection to generate a further reinforced solid wall;

[0026] Step S33: Based on the stress of the reinforced solid wall, dense short core rods are obliquely implanted near the intersection of the reinforced solid wall.

[0027] A further technical solution is that step S3 further includes:

[0028] Step S301: Before the solid wall solidifies, a steel frame is sunk into the solid wall by using vibration pressure, and a steel strand is passed through a fixed steel pipe at the bottom of the steel frame, and both ends of the steel strand are fixed to a pre-buried prestressed pedestal;

[0029] Step S302: When pouring the floor concrete, the vertical steel sections on the steel frame are connected to the reinforced concrete beams on the solid wall to form a composite structure of the upper reinforced concrete beams, the middle steel structure, and the lower prestressed steel strands.

[0030] Step S303: pre-embed a pedestal on the reinforced concrete beam on the solid wall, and after the poured concrete reaches a predetermined strength, tension the steel strands to apply prestress.

[0031] A further technical solution is that the multi-grid surface planning frame diagram formed by the fixed piles includes a plurality of square grids and rectangular grids and is applied to the step S4. The specific operation steps include:

[0032] Step S41: Based on the square grid, a first mechanism is used to lay and pour a floor on top of the solid wall, and a first two-way slab floor bearing structure supported by fixed piles that are supported upward to control the sinking of the fixed piles is provided around and in the middle of the solid wall;

[0033] Step S42: Based on the rectangle, a second mechanism is used to lay and pour the floor on top of the solid wall to form a first unidirectional primary and secondary beam floor structure.

[0034] A further technical solution is that step S41 specifically includes:

[0035] Step S411: locally expand and thicken the beam support armpits on the top of the solid wall and cast the floor. The solid wall has a two-way slab floor load-bearing structure supported by the fixed piles that control the upward sinking.

[0036] Step S412: precast concrete rib beams are arranged on the leveling pad at the top of the solid wall, and precast concrete beam segments are arranged in the other direction to generate a hybrid prestressed bidirectional beam-slab structure with the fixed piles supporting the surrounding and middle parts of the solid wall for upward sinking.

[0037] A further technical solution is that the specific steps of step S412 include:

[0038] Step S1421: Use steel segments to make the stressed and unstressed precast concrete rib beams;

[0039] Step S1422: Install the frame pedestal and the precast concrete rib beams around the solid wall, and embed nuts on their top surfaces to connect them, forming a pre-tensioned pedestal and a side form for pouring concrete;

[0040] Step S1423: Leave a gap between the pre-tensioned pedestal and the concrete pouring side formwork, and complete the tensioning construction operation of the pre-tensioned pedestal and the concrete pouring side formwork within the gap.

[0041] A further technical solution is that the step S4 further includes:

[0042] Step S43: erecting a multi-grid surface planning frame edge beam on the fixed pile body, and erecting the precast concrete rib beam on the multi-grid surface planning frame edge beam to generate a second two-way slab floor load-bearing structure with the fixed piles supporting the surrounding and central portions of the solid wall for upward sinking;

[0043] Step S44: setting a concrete main beam on the fixed pile body along the long side direction of the multi-grid surface planning frame, wherein the pre-embedded post-tensioned prestressed steel strand is anchored on the pre-embedded tensioning pedestal at the corner of the multi-grid surface planning frame to form a second unidirectional main and secondary beam floor structure.

[0044] The beneficial effects of the present invention are:

[0045] First, a prediction is made of the address, and based on the predicted geographic location, multiple intersecting surface planning lines are set to generate a multi-grid surface planning framework diagram to facilitate the subsequent search for crisscrossing points. In the multi-grid surface planning framework diagram, according to the intersections presented, multiple fixed piles are driven and controlled to sink into the predicted geographic location to form a preliminary shape. Then, multiple solid walls are built on the surface of the predicted geographic location through the intervals between the multiple fixed piles to form a foundation and a wall. The wall forms a mesh body, and finally the floor is poured on the top surface of the solid wall to form a multi-directional floor force-bearing structure with the fixed piles supporting the upward sinking in the middle. This is used to solve the technical problem that when the foundation soil of the construction site is complex and weak, improper treatment will cause settlement differences to cause floor cracks and subsidence. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 This is a flow chart of the overall steps of a method for constructing a mixed prestressed cement-soil reinforced wall provided by the present invention;

[0047] Figure 2 A specific flow chart of step S1 of a method for constructing a mixed prestressed cement-soil reinforced wall provided by the present invention;

[0048] Figure 3 A specific flow chart of step S2 of a method for constructing a mixed prestressed cement-soil reinforced wall provided by the present invention;

[0049] Figure 4 A specific flow chart of step S3 of a method for constructing a mixed prestressed cement-soil reinforced wall provided by the present invention;

[0050] Figure 5 This is a specific flow chart of step S4 of a method for constructing a mixed prestressed cement-soil reinforced wall provided by the present invention. DETAILED DESCRIPTION

[0051] In order to better understand the technical content of the present invention, specific embodiments are provided below, and the present invention is further described in conjunction with the accompanying drawings.

[0052] See also Figures 1 to 5 The present invention provides a method for constructing a prestressed cement-soil reinforced wall, comprising:

[0053] Step S1: Based on the predicted geographical location, multiple intersecting surface planning lines are set to generate a surface planning frame diagram with multiple grids;

[0054] Step S2: driving and controlling a plurality of fixed piles into the predicted geographical location according to the intersections in the multi-grid surface planning diagram;

[0055] Step S3: construct multiple solid walls on the ground surface at the predicted geographical location by spacing multiple fixed piles;

[0056] Step S4: pouring the floor on the top surface of the multiple solid walls to form a multi-directional floor force-bearing structure with upward-sinking fixed piles supporting the middle part.

[0057] It should be noted that the predicted geographical location may be a column grid plan of a modern industrial plant or a site for other purposes. The multi-grid surface planning frame diagram may be a diagram formed by powder marking or wire planning to form a frame.

[0058] Solid walls can be constructed using ordinary cement as a curing agent, repeatedly mixed along the wall's axis to form a cement-soil wall. The width of the cement wall ranges from 500 to 2000 mm, and the height ranges from 1000 to 4000 mm. The cement-soil ratio is typically 10% to 25%. Cement-soil walls constructed along a grid can be constructed using various mixing methods: First, cement slurry can be poured into the wall using a conventional excavator, or dry cement can be directly added and repeatedly mixed using a bucket; second, cement slurry can be poured into the wall using a specially developed mixing wheel mounted on the excavator's arm, or dry cement can be directly added and repeatedly mixed; third, cement slurry can be poured into the wall using a specially developed horizontally rotating, vertically lifting mixing head mounted on the excavator's arm, or dry cement can be directly added and repeatedly mixed. Vertical and horizontal cement-soil walls can also use a curing agent to partially or completely replace cement, resulting in stronger or more cost-effective vertical and horizontal walls, or both.

[0059] In the embodiments of the present invention, firstly, the floor of the factory building and the site is divided into large-scale vertical and horizontal grids. At the intersections of the grids, cheap cement mixing piles, composite rigid piles, or rigid piles are driven as long piles for settlement control as needed. At the vertical and horizontal intersections or in the middle of the grids, short piles for settlement control are driven as needed. Thick cement soil walls with reinforcing core rods are driven along the vertical and horizontal grid lines. Secondly, for a square multi-grid surface planning frame, reinforced concrete slabs are directly cast on the thick cement soil walls with vertical and horizontal reinforcing core rods in the multi-grid surface planning frame to form a two-way floor slab structure supported by short settlement control piles in the middle.

[0060] Third, for the square multi-grid surface planning framework, a prefabricated rib beam with pre-tensioned steel strands in one direction and a composite beam with post-tensioned steel strands in the other direction are set on the cement-soil thick wall of the multi-grid surface planning framework with vertical and horizontal reinforcement core rods to form a two-way grid beam system. This beam system is used as a reaction frame to realize on-site pre-tensioning of reinforced concrete floor slabs, thus forming a new hybrid prestressed two-way grid beam floor structure, which reduces project costs and improves work efficiency.

[0061] Fourth, in view of the large amount of backfill in the original low-lying ground site and the square grid, post-tensioned reinforced concrete prestressed side beams were cast directly on the control piles, and a bidirectional pre-tensioned grid beam system was laid in the same way as above. Moreover, it is a pile-supported mixed prestressed bidirectional grid beam floor structure with pre-tensioned steel bars on site, which reduces the project cost and improves work efficiency.

[0062] Fifth, for the square grid condition, in response to the third and fourth conditions mentioned above, reinforced concrete slab formwork and upper standardized steel mesh are directly laid on each grid of the laid bidirectional prestressed grid beam system, and then concrete is poured to form a new bidirectional prestressed grid beam system spliced ​​floor structure, which saves construction costs and improves work efficiency;

[0063] Sixth, for the rectangular multi-grid surface planning framework, prefabricated prestressed secondary beams are erected at equal intervals on the cement-soil thick wall with reinforced core rods along the long side of the multi-grid surface planning framework, and prestressed one-way prefabricated plate formwork and upper standardized steel mesh are laid on top, and then concrete is poured to form a mixed prestressed one-way beam-slab floor structure, which reduces the project cost and improves work efficiency;

[0064] Seventh, in view of the large amount of backfill in the original low-lying ground site and the rectangular grid, post-tensioned reinforced concrete prestressed main beams are directly cast on the controlled sinking piles along the long side of the multi-grid surface planning frame, prefabricated prestressed secondary beams are erected at equal intervals, prestressed one-way prefabricated plate formwork and upper standardized steel mesh are laid on top, and then concrete is poured to form a pile-supported mixed prestressed one-way beam-slab ground structure, which reduces the project cost and improves work efficiency.

[0065] Specifically, first, a prediction is made on the address, and based on the predicted geographic location, multiple intersecting surface planning lines are set to generate a multi-grid surface planning framework to facilitate the subsequent search for crisscrossing points. In the multi-grid surface planning framework, multiple fixed piles are driven and controlled to sink into the predicted geographic location according to the intersections presented to form a preliminary shape. Then, multiple solid walls are built on the surface of the predicted geographic location through the intervals between the multiple fixed piles to form a foundation and a wall. The wall forms a mesh body, and finally the floor is poured on the top surface of the solid wall to form a multi-directional floor force-bearing structure with upward-controlled fixed piles in the middle. This is used to solve the technical problem that when the foundation soil of the construction site is complex and weak, improper treatment will cause settlement differences, resulting in floor cracks and subsidence.

[0066] Preferably, step S1 specifically includes:

[0067] Step S11: Obtain information on the geological softness, horizontal height, and surface structure of the site to be built, and generate a predicted geographical location;

[0068] Step S12: Divide the area into multiple areas to be marked according to the predicted geographical location;

[0069] Step S13: setting a plurality of cross-surface planning lines according to the predicted geographical locations corresponding to the plurality of areas to be marked;

[0070] Step S14: differentiating multi-shape planning maps according to intersecting surface planning lines;

[0071] Step S15: Incorporate the multi-shape planning diagrams into the information table to generate a multi-grid surface planning frame diagram.

[0072] In an embodiment of the present invention, a standardized vertical and horizontal division is performed based on the column grid plane of a modern industrial plant or the site plane of other uses. The values ​​of the multi-grid surface planning frame diagram formed by the division are determined according to the distribution and properties of the soil layers, the size of the load borne by the floor, the requirements of the floor for controlling settlement, and the method of the floor structure. If the floor is directly cast on the vertical and horizontal cement soil walls or beams to form a two-way slab load-bearing structure, the multi-grid surface planning frame diagram should be square and usually have a value between 3 and 10 meters; if prefabricated reinforced concrete rib beams are erected on the cement soil walls or beams to form a one-way beam-slab structure floor, that is, the multi-grid surface planning frame diagram should be rectangular, with the long side having a value between 6 and 12 meters and the short side having a value between 3 and 9 meters. For the construction of the floor of various other sites, the above-mentioned standardized division can be performed as needed according to the stress conditions of the floor structure. However, for the floor of an industrial plant, the division method is usually based on the column grid.

[0073] Specifically, the area is divided into multiple areas to be marked according to different geological and surface structures, and then cross-surface planning lines connected vertically and horizontally are implemented in the areas to be marked to form a multi-shape planning map with multiple grids. Based on this planning map, a multi-grid surface planning framework map to be constructed can be formed.

[0074] Preferably, in step S2, the fixed pile body includes a first fixed pile body and a second fixed pile body, which specifically includes:

[0075] Step S21: Determine the intersection control selection based on the soil layer distribution, soil properties, floor load and floor structure of the predicted geographical location;

[0076] Step S22: According to the intersection control selection, the first fixed pile body or the second fixed pile body is controlled.

[0077] It should be noted that the first fixed pile body can be a long pile, and the second fixed pile body can be a short pile.

[0078] In this embodiment of the present invention, due to the varying distribution of soil layers, soil properties, load bearing capacity, and floor structure, an appropriate geographic location is selected based on the calculated results to facilitate subsequent intersection control selection. After selecting a suitable location, either the first or second fixed pile is driven based on the intersection control selection to facilitate subsequent pouring.

[0079] Preferably, step S22 includes:

[0080] Step S221: using a mixture of multiple materials or a single material to make a first pre-treated pile body, converting the pre-treated pile body into a first fixed pile body, and driving and controlling the first fixed pile body according to the intersection driving and control selection;

[0081] Step S222: using a single material to make a second pre-treated pile body, converting the second pre-treated pile body into a second fixed pile body, and driving and controlling the second fixed pile body according to the intersection driving and control selection;

[0082] Step S223: In step S221, based on the site conditions selected for the intersection control, preselect a first fixed pile body with a length adapted to the site conditions.

[0083] It should be noted that the multi-material mixture can be multiple types of concrete plus steel and composite steel, and the single material can be concrete.

[0084] In an embodiment of the present invention, the first solid pile body for controlling the sinking is usually made of inexpensive flexible piles, with cement mixing piles being the first choice, followed by high-pressure rotary jet piles, and even high-pressure grouting cement soil piles. Core rods can also be implanted in these cement soil piles, such as prefabricated pipe piles, prefabricated square piles, pine wood piles, whole bamboos, or even steel pipes, etc., to form composite piles to enhance the strength of the pile body. The diameter of such cement soil piles is 400 to 1200 mm, and the diameter of the implanted core rod is 100 to 600 mm. Depending on the distribution of soil layers and soil properties, short piles for controlling the sinking are usually made of cement mixing piles, prefabricated pipe piles or square piles, pine wood piles, whole bamboos, etc., which can reduce the stress on cement soil walls or reinforced concrete floors. In view of the low-lying original site that requires a large amount of backfill, if no backfill or little backfill is adopted and a pile-supported floor structure is used, the first choice for long piles for controlling settlement is to implant prefabricated long pipe piles or square piles in short cement mixing piles so that the pile tips enter the good soil layer to control settlement. Prefabricated long pipe piles, square piles or even cast-in-place piles can also be directly used. In order to save construction costs and increase the settlement control effect, the present invention develops cement soil settlement control long or short piles that can be expanded. The expanded diameter of the cement soil pile is 800 to 1500mm, which is determined by the soil layer conditions, settlement control requirements and the function of the equipment. Specifically, it can be a pile end expansion head and multi-stage expansion, a cement mixing pile end or a multi-stage expansion implanted with a prefabricated long pipe pile or square pile, and a high-pressure grouting cement expansion head at the end of the long pipe pile or square pile.

[0085] Preferably, step S3 specifically includes:

[0086] Step S31: obliquely implanting a first reinforcing core rod into the solid wall formed by stirring, so that when the solid wall solidifies, a reinforced solid wall with the intersecting reinforcing core rods implanted therein is formed;

[0087] Step S32: Based on the reinforced solid wall, a second reinforcing core rod is implanted into the fixed pile body at the intersection to generate a further reinforced solid wall;

[0088] Step S33: Based on the stress of the reinforced solid wall, dense short core rods are obliquely implanted near the intersection of the reinforced solid wall.

[0089] In this embodiment of the present invention, reinforcing core rods are inserted diagonally into the vertical and horizontal water-reinforced concrete walls, taking into account the stresses on the walls and the importance of controlling floor subsidence. Once the walls solidify, they form a unified structure with the intersecting reinforcing core rods. These diagonally inserted cross-cored reinforcing core rods can be steel pipes, small precast concrete piles, pinewood piles, or bundled bamboo piles. These rods are inserted using an excavator bucket before the walls solidify.

[0090] In vertical and horizontal solid walls, in addition to cross-reinforcement cores, vertical reinforcing cores are inserted into the first fixed piles at the intersections of the grid, depending on the loads on the wall. These cores are then integrated with the cross-reinforcement cores and the solid wall. These vertical reinforcing cores can be precast pipe piles, small precast concrete piles, pinewood piles, bundled bamboo piles, or even steel pipes.

[0091] In vertical and horizontal solid walls, depending on the load on the wall, dense short core rods can be inserted diagonally near the intersection of the adjacent vertical and horizontal cement-soil walls to strengthen the cement-soil wall's punching and shear strength. These dense short core rods are usually made of bamboo, but other more expensive core rods can also be used.

[0092] In vertical and horizontal solid walls, entire horizontal reinforcing cores can also be sunk into the unset solid wall. These cores can be small precast concrete piles, pinewood piles, bundled bamboo piles, or even steel pipes. These cores can be sunk using a bucket and vibrating forks.

[0093] Preferably, step S3 further includes:

[0094] Step S301: Before the solid wall solidifies, a steel frame is sunk into the solid wall by using vibration pressure. Steel strands are inserted into the fixed steel pipes at the bottom of the steel frame, and both ends of the steel strands are fixed to pre-buried prestressed pedestals.

[0095] Step S302: When pouring the floor concrete, the vertical steel sections on the steel frame are connected to the reinforced concrete beams on the solid wall to form a composite structure of the upper reinforced concrete beams, the middle steel structure, and the lower prestressed steel strands.

[0096] Step S303: pre-embed a pedestal in the reinforced concrete beam on the solid wall, and after the poured concrete reaches a predetermined strength, tension the steel strands to apply prestress.

[0097] In an embodiment of the present invention, a special steel frame is sunk into the cement soil wall by means of vibration pressure before the solid wall solidifies. A steel strand is passed through a fixed steel pipe in the steel section at the bottom of the steel frame, and both ends of the steel strand are temporarily fixed to prestressed pedestals embedded in advance. The steel section at the bottom is welded to the vertical steel section. After solidification, the solid wall forms a whole with the steel frame. When pouring the floor concrete, the vertical steel sections on the steel frame are connected to the reinforced concrete beams on the solid wall, forming a composite structure of the upper reinforced concrete beams, the middle steel structure, the lower prestressed steel strands and the solid wall. When pouring the reinforced concrete beams on the solid wall, a tensioning pedestal is pre-buried. After the poured concrete reaches a certain strength, the tensioning steel strands are applied with prestressing force, so that the composite structure of the solid wall has good bearing strength.

[0098] During the casting of common edge beams around the perimeter of each multi-grid surface plan, pre-tensioned prestressed steel strands are embedded and anchored to pre-embedded tensioning pedestals at the corners of the multi-grid surface plan. These pre-embedded tensioning pedestals are manufactured using a standard method. After the adjacent slabs are cast and the gap is left, they are integrated with the common edge beams. The pre-embedded steel strands are tensioned and anchored to form the post-tensioned prestressed edge beams.

[0099] Preferably, the multi-grid surface planning frame diagram formed by the fixed piles includes a plurality of square grids and rectangular grids and is applied to step S4. The specific operation steps include:

[0100] Step S41: Based on a square grid, a first mechanism is used to lay and pour a floor on top of the solid wall, and a first two-way slab floor force-bearing structure supported by upward-sinking fixed piles is provided around and in the middle of the solid wall;

[0101] Step S42: Based on the rectangle, a second mechanism is used to lay and pour the floor on top of the solid wall to form a first unidirectional primary and secondary beam floor structure.

[0102] It should be noted that the first mechanism can be formed by directly setting up a locally extended and thickened beam support armpit on the top of the solid wall; after pouring a thin concrete cushion layer on it, pre-stressed prefabricated secondary beams are erected at intervals and prefabricated slab formwork is laid, and the middle steel mesh is fully laid along the prefabricated slab formwork, and then the steel mesh is laid along the upper part of the secondary beam to form the second mechanism.

[0103] In an embodiment of the present invention, when the multi-grid surface planning framework is square, the floor is cast on the first mechanism, and together with the second fixed pile body supporting the surrounding and middle parts of the lower part of the solid wall for controlling the sinking, a two-way slab floor load-bearing structure is formed to jointly resist the load borne on the floor, so as to reduce the stress on the floor load-bearing structure and improve the bearing capacity of the floor. The thickness and reinforcement of the thickened beam support armpit and the floor slab are determined by the load borne on the floor, the size of the vertical and horizontal grid structure, and the requirements of the floor for controlling the sinking. When the multi-grid surface planning framework is rectangular, the solid wall reinforced in the long side direction is the main beam, and in the short side direction, it is usually not necessary to reinforce the solid wall. After pouring a thin concrete cushion layer, prestressed prefabricated secondary beams are erected at intervals and prefabricated plate formwork is laid, and the middle steel mesh is fully laid along the prefabricated plate formwork, and then the steel mesh is laid along the upper part of the secondary beam. Casting reinforced concrete slabs forms a one-way main and secondary beam floor structure.

[0104] Preferably, step S41 specifically includes:

[0105] Step S411: locally expand and thicken the beam support arm at the top of the solid wall and cast the floor. A two-way slab floor load-bearing structure supported by upward-sinking fixed piles is provided around and in the middle of the solid wall.

[0106] Step S412: Arrange precast concrete rib beams on the leveling pad at the top of the solid wall, and arrange precast concrete beam segments in the other direction to generate a hybrid prestressed bidirectional beam-slab structure supported by upward-sinking fixed piles around and in the middle of the solid wall.

[0107] It should be noted that the two-way slab floor load-bearing structure is the first two-way slab floor load-bearing structure. The precast concrete rib beam is a pre-tensioned prestressed rib beam.

[0108] In the embodiments of the present invention, the cross-section of the pre-tensioned prestressed rib beam is generally rectangular, but other shapes are possible. The bottom is prestressed with high-strength steel strands, and the upper portion is prestressed with high-strength cold-drawn fine steel bars. The beam height and the thickness of the cast floor slab are determined by the strength design. The finished pre-tensioned prestressed rib beam is already prestressed and is typically produced in a prefabricated factory using the pre-tensioned long-line method. The fine prestressed steel bars in the upper portion of the pre-tensioned rib beam, with a higher over-tension ratio than the steel strands, more effectively offset the unbalanced prestressing of the lower strands on the beam cross-section, which causes the secondary beam to arch upward. The finished pre-tensioned rib beam has beveled edges at both ends, with a small steel pipe hole in the middle for connection to the transverse beam. Fine prestressed steel bars and stirrups are also retained on the beam. Nuts are embedded at both ends for installing and removing the steel section long-draw pedestal frame, which is installed and removed using bolts. Small holes are also provided at the upper and lower ends for inserting rebar along the edge of the block for use as the uniform reinforcement for the cast edge stiffening beam. The pedestal frame also serves as the upper side formwork for pouring the floor.

[0109] Precast concrete rib beams, including edge and center beams, can be non-prestressed, with cross-sectional shapes and dimensions generally identical to those of precast concrete rib beams. Small steel pipes for steel strands are concentrically embedded in the lower sections of the edge and center beams. Short, stiffening steel pipes are installed at the ends, inserted into the precast concrete rib beams' embedded steel pipes to provide temporary support for the splicing. The outer ends of the edge beams feature beveled edges for embedding nuts for installing and removing the steel pedestal frame. A steel plate pedestal for tensioning the steel strands is embedded in the bottom, with holes cut to allow the small steel pipes to pass through.

[0110] Precast concrete rib beams are arranged on the top of the vertical and horizontal solid walls of the multi-grid surface planning frame, while precast concrete beam sections are spliced ​​and placed in the other direction to form a complete grid plane beam system within the multi-grid surface planning frame. The plane beam system can be a single two-way beam system, a double two-way beam system, or a triple two-way beam system according to the size of the multi-grid surface planning frame and the load borne by the floor. If the design requires, more two-way beam systems can be used to form a mixed prestressed two-way beam-slab structure.

[0111] Preferably, step S412 specifically includes:

[0112] Step S1421: Use steel segments to make stress- and non-stress-resistant precast concrete rib beams;

[0113] Step S1422: Install frame pedestals and precast concrete ribs around the solid wall, and embed nuts on their top surfaces to connect them, forming a pre-tensioned pedestal and a side form for pouring concrete;

[0114] Step S1423: Leave a gap between the pre-tensioned pedestal and the concrete pouring side formwork, and complete the tensioning construction operation of the pre-tensioned pedestal and the concrete pouring side formwork within the gap.

[0115] In an embodiment of the present invention, the steel frame pedestals are conveniently installed with bolts around the grid plane beam system in the multi-grid surface planning framework and connected with pre-embedded nuts on the prefabricated rib beams to form a pre-tensioned pedestal and a concrete pouring side formwork. The standardized steel angle frame pedestals are bolted to the frame pedestals at the four corners of the grid to form a tensioned side pedestal and two-part side formwork for a complete circle of the multi-grid surface planning framework. High-strength cold-drawn fine steel bars are inserted vertically and horizontally into each pre-drilled hole in the frame pedestal. The left and right spacing of these pre-drilled holes is exactly the floor reinforcement spacing (200mm), and the upper and lower spacing is the upper and lower reinforcement spacing of the floor slab. Conventional tensioning methods are used to apply prestress to each fine steel bar. After pouring the floor concrete, the anchor is removed or the fine steel bar head is cut off to form an on-site pre-tensioned method for constructing the concrete floor. This should be a first. The steel strands that have passed through the small tube are tensioned and anchored to form a two-way grid plane beam system structure with two directions of pre-tensioning and post-tensioning respectively. The base form for pouring floor concrete can be a simple, flat earth form or a standard slab form, as the forces acting on the floor are independent of the underlying foundation soil. When pouring floor concrete, the perimeter reinforcement beams should first be connected by inserting two upper and lower rebars through the pre-reserved holes in the ribs to provide reinforcement at each beam end. A standard formwork is then used to create the beam formwork and pour the concrete. After the multi-grid floor is constructed, the connecting bolts can be removed to easily reclaim the frame pedestal for use in the next multi-grid floor.

[0116] The construction of adjacent multi-grid surface planning frames does not affect each other. A certain distance (300-500mm) is left between the multi-grid surface planning frames to enable the normal tensioning and removal of the multi-grid surface planning frames constructed later. The gaps reserved between the multi-grid surface planning frames are filled with micro-expansive concrete.

[0117] To ensure that adjacent multi-grid surfaces are constructed without interfering with each other during tensioning and removal operations, a cluster bolt tensioning device for fine steel bars was developed. The prestressing principle of the cluster bolt tensioning device is to weld standardized nuts at predetermined positions on the frame pedestal. A tensioning plate is threaded through the bolts. Rotating the bolts causes the plate to move horizontally, stretching and prestressing the fine steel bars on the plate. After pouring the floor concrete, the steel bars are sheared to complete the prestressing, and the bolts are then rotated in the opposite direction to remove the cluster bolt tensioning device.

[0118] For the multi-grid surface planning framework that encounters the columns and exterior walls of industrial plants, in order to ensure the tensioning of the fine steel bars of the floor slab and the subsequent tensioning construction operations of the cement reinforced walls, the embedded tensioning pedestal should be kept at an operating distance from these columns and exterior walls.

[0119] In case the original site of the floor has a large amount of low-lying backfill and the multi-grid surface planning framework is square, the multi-grid surface planning framework edge beams can be directly cast on the first and second fixed piles for controlling the settlement, and then prefabricated rib beams can be erected on top of them, forming another new flooring method: that is, the multi-grid surface planning framework edge beams are cast on the first and second fixed piles for controlling the settlement, and the multi-grid surface planning framework is surrounded by edge beams. The edge beams are shared by adjacent multi-grid surface planning frameworks. Considering that the construction of each multi-grid surface planning framework floor is carried out piece by piece, that adjacent multi-grid surface planning frameworks should reserve space for tensioning construction operations, and that factory floor construction is often affected by structural columns and side span exterior walls, the outer edges of the corners of each multi-grid surface planning framework are appropriately adjusted according to the situation, usually greater than 400mm.

[0120] Preferably, step S4 further includes:

[0121] Step S43: erecting a multi-grid surface planning frame edge beam on the fixed pile body, and erecting a precast concrete rib beam on the multi-grid surface planning frame edge beam to generate a second two-way slab floor load-bearing structure with upward-sinking fixed piles supporting the surrounding and central portions of the solid wall;

[0122] Step S44: Set a concrete main beam on the fixed pile body along the long side direction of the multi-grid surface planning frame, wherein the pre-embedded post-tensioned prestressed steel strands are anchored on the pre-embedded tensioning pedestals at the corners of the multi-grid surface planning frame to form a second unidirectional main and secondary beam floor structure.

[0123] In an embodiment of the present invention, precast slab formwork is directly laid on the longitudinal and transverse precast concrete rib beams and precast concrete beam segments and the grid that constitutes the grid plane beam system to form a bottom formwork and reinforcement. Standardized lattice steel mesh is first laid on the grid, and then the edge steel mesh is laid along the longitudinal and transverse edges of the grid. Finally, node steel mesh is laid at the intersection of each longitudinal and transverse beam to form floor slab reinforcement. After pouring the floor concrete, the steel strands passing through the beam segments are tensioned to form a second two-way slab floor force-bearing structure.

[0124] If the multi-grid surface planning framework is rectangular and the original flooring site is low and requires a large amount of backfill, a concrete main beam can be cast along the long sides of the multi-grid surface planning framework, along the first and second solid piles for controlled settlement. Prestressed steel strands are embedded and then tensioned, anchored to pre-embedded tensioning pedestals at the corners of the multi-grid surface planning framework. Pre-tensioned precast secondary beams are installed at intervals above the concrete main beams, and precast slab formwork is laid. Steel mesh is then laid on top, and concrete is poured to complete the multi-grid surface planning framework flooring. Concrete is then poured at the intersection of adjacent blocks, forming a single unit with the cast main beam below. Tensioning pedestals are embedded at the long sides of the multi-grid surface planning framework. Single or double precast secondary beams can be placed directly on the main beams along the short sides of the multi-grid surface planning framework. Steel strands are tensioned and anchored along the long sides of the multi-grid surface planning framework, forming the load-bearing structure of the second two-way slab flooring.

[0125] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for constructing a prestressed cement-soil reinforced wall, characterized in that: include: Step S1: Based on the predicted geographical location, multiple intersecting surface planning lines are set to generate a surface planning frame diagram with multiple grids; Step S2: driving and controlling a plurality of fixed piles into the predicted geographical location according to the intersections in the multi-grid surface planning diagram; Step S3: constructing multiple solid walls on the ground surface of the predicted geographical location by using the intervals between the multiple fixed piles; Step S4: pouring the floor on the top surfaces of the multiple solid walls to form a multi-directional floor force-bearing structure with the fixed piles in the middle supporting the upward sinking.

2. A method for constructing a mixed prestressed cement soil reinforcement wall according to claim 1, characterized in that: The step S1 specifically includes: Step S11: obtaining information on the geological softness, horizontal height, and surface structure of the site to be constructed, and generating the predicted geographical location; Step S12: dividing the predicted geographical location into a plurality of areas to be marked; Step S13, setting a plurality of cross-surface planning lines according to the predicted geographical locations corresponding to the plurality of areas to be marked; Step S14: differentiating multi-shape planning maps according to the intersecting surface planning lines; Step S15: Incorporate the multi-shape planning diagrams into an information table to generate the multi-grid surface planning diagram.

3. The method for constructing a mixed prestressed cement soil reinforcement wall according to claim 2, characterized in that: In step S2, the fixed pile body includes a first fixed pile body and a second fixed pile body, which specifically includes: Step S21, determining the intersection control selection according to the soil layer distribution, soil properties, floor load and floor structure of the predicted geographical location; Step S22: according to the intersection control selection, control the first fixed pile or the second fixed pile.

4. A method for constructing a mixed prestressed cement soil reinforcement wall according to claim 3, characterized in that: The step S22 includes: Step S221: using a multi-material mixture or a single material to make a first pre-treated pile body, converting the pre-treated pile body into the first fixed pile body, and driving and controlling the first fixed pile body according to the intersection driving and control selection; Step S222: using the single material to make a second pre-treated pile body, converting the second pre-treated pile body into a second fixed pile body, and driving and controlling the second fixed pile body according to the intersection driving and control selection; Step S223: In step S221, based on the site conditions selected for the intersection control, preselect the first fixed pile body with a length suitable for the site conditions.

5. The method for constructing a prestressed cement-soil reinforced wall according to claim 1, characterized in that: The step S3 specifically includes: Step S31: obliquely implanting a first reinforcing core rod into the solid wall formed by stirring, so that when the solid wall solidifies, a reinforced solid wall with cross-reinforcing core rods implanted therein is formed; Step S32: Based on the reinforced solid wall, a second reinforcing core rod is implanted into the fixed pile body at the intersection to generate a further reinforced solid wall; Step S33: Based on the stress of the reinforced solid wall, dense short core rods are obliquely implanted near the intersection of the reinforced solid wall.

6. The method for constructing a prestressed cement-soil reinforced wall according to claim 1, characterized in that: The step S3 further comprises: Step S301: Before the solid wall solidifies, a steel frame is sunk into the solid wall by using vibration pressure, and a steel strand is passed through a fixed steel pipe at the bottom of the steel frame, and both ends of the steel strand are fixed to a pre-buried prestressed pedestal; Step S302: When pouring the floor concrete, the vertical steel sections on the steel frame are connected to the reinforced concrete beams on the solid wall to form a composite structure of the upper reinforced concrete beams, the middle steel structure, and the lower prestressed steel strands. Step S303: pre-embed a pedestal on the reinforced concrete beam on the solid wall, and after the poured concrete reaches a predetermined strength, tension the steel strands to apply prestress.

7. The method for constructing a mixed prestressed cement soil reinforcement wall according to claim 1, characterized in that: The multi-grid surface planning frame diagram formed by the fixed piles includes a plurality of square grids and rectangular grids and is applied to the step S4. The specific operation steps include: Step S41: Based on the square grid, a first mechanism is used to lay and pour a floor on top of the solid wall, and a first two-way slab floor bearing structure supported by fixed piles that are supported upward to control the sinking of the fixed piles is provided around and in the middle of the solid wall; Step S42: Based on the rectangle, a second mechanism is used to lay and pour the floor on top of the solid wall to form a first unidirectional primary and secondary beam floor structure.

8. The method for constructing a mixed prestressed cement-soil reinforced wall according to claim 7, characterized in that: The step S41 specifically includes: Step S411: locally expand and thicken the beam support armpits on the top of the solid wall and cast the floor. The solid wall has a two-way slab floor load-bearing structure supported by the fixed piles that control the upward sinking. Step S412: precast concrete rib beams are arranged on the leveling pad at the top of the solid wall, and precast concrete beam segments are arranged in the other direction to generate a hybrid prestressed bidirectional beam-slab structure with the fixed piles supporting the surrounding and middle parts of the solid wall for upward sinking.

9. A method for constructing a prestressed cement-soil reinforced wall according to claim 8, characterized in that: The specific steps of step S412 include: Step S1421: Use steel segments to make the stressed and unstressed precast concrete rib beams; Step S1422: Install the frame pedestal and the precast concrete rib beams around the solid wall, and embed nuts on their top surfaces to connect them, forming a pre-tensioned pedestal and a side form for pouring concrete; Step S1423: Leave a gap between the pre-tensioned pedestal and the concrete pouring side formwork, and complete the tensioning construction operation of the pre-tensioned pedestal and the concrete pouring side formwork within the gap.

10. The method for constructing a prestressed cement-soil reinforced wall according to claim 7, characterized in that: The step S4 further includes: Step S43: erecting a multi-grid surface planning frame edge beam on the fixed pile body, and erecting the precast concrete rib beam on the multi-grid surface planning frame edge beam to generate a second two-way slab floor load-bearing structure with the fixed piles supporting the surrounding and central portions of the solid wall for upward sinking; Step S44: setting a concrete main beam on the fixed pile body along the long side direction of the multi-grid surface planning frame, wherein the pre-embedded post-tensioned prestressed steel strand is anchored on the pre-embedded tensioning pedestal at the corner of the multi-grid surface planning frame to form a second unidirectional main and secondary beam floor structure.

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