CN113152515A

CN113152515A - Modular assembly type prestress retaining wall and construction method thereof

Info

Publication number: CN113152515A
Application number: CN202110483084.9A
Authority: CN
Inventors: 卢震宇; 张延年; 焦莉
Original assignee: Shenyang Jianzhu University
Current assignee: Shenyang Jianzhu University
Priority date: 2021-04-30
Filing date: 2021-04-30
Publication date: 2021-07-23

Abstract

The invention discloses a modular assembly type prestressed retaining wall and a construction method thereof, wherein the modular assembly type prestressed retaining wall comprises a bottom plate, a plurality of groups of wall monomers, secondary casting belts, fixed blocks and connecting plates, the wall monomers are arranged between every two adjacent wall monomers and the outer side edge ends of the wall monomers at two ends are respectively provided with one supporting arm, the included angle between each wall monomer and each supporting arm is 90 degrees, the wall monomers and the supporting arms are connected through the connecting plates, the peripheries of the bottoms of the supporting arms and the wall monomers are surrounded by the fixed blocks, the bottom ends of the wall monomers, the supporting arms and the fixed blocks are all inserted into reserved slots of the bottom plate, and the secondary casting belts are respectively filled at seams among the wall monomers, the supporting arms and the fixed blocks; and reserved common steel bars and prestressed steel bar pore channels are arranged in the wall body monomer. The invention has simple components and convenient operation. The stress is reasonable, the prestressed tendons can resist partial tensile stress in the tensile area in the wall, and the wall has better stability and deformation resistance.

Description

Modular assembly type prestress retaining wall and construction method thereof

Technical Field

The invention relates to a retaining wall, in particular to a modular assembly type prestressed retaining wall and a construction method thereof.

Background

The counterfort retaining wall is a light supporting and retaining structure, and the stability of the retaining wall is maintained by the dead weight of a wall body and the weight of a filled soil body (including load) above a wall bottom plate. Most buttress type retaining walls have narrow wall surfaces, so that the strength of resisting soil bodies is relatively low, and the buttress type retaining walls are suitable for municipal engineering and underground space engineering with relatively low foundation bearing capacity.

The traditional integral type cast-in-situ arm-supporting retaining wall needs to be subjected to a plurality of procedures such as measurement lofting, foundation pit excavation, foundation manufacturing, reinforcement binding, formwork supporting, concrete cast-in-situ, maintenance, formwork removal and the like in the construction process. Therefore, the construction period is too long, a large amount of labor, wood and the like are consumed, the cost and the construction quality are difficult to control, the requirement on surrounding site space is high, and the environment is damaged to a certain degree. Therefore, the assembled type supporting arm retaining wall can solve part of problems and simultaneously increase prestressed steel bars in the wall body, and the overall strength and stability of the structure are improved to a certain extent, which is a trend of future development.

The assembled retaining wall can form a mode of factory standardized prefabrication and field installation and assembly, has the advantages of short assembly period and high quality of prefabricated parts, and reduces consumption of a large amount of labor and wood. Meanwhile, the prestressed tendons are added to improve the overall strength and stability, and the prestressed tendons can be used in municipal engineering and underground space engineering with higher side slope soil or common foundation bearing capacity. Therefore, the assembled prestress supporting arm retaining wall has important significance in discussing and inventing.

Disclosure of Invention

The invention aims to provide a modular assembly type prestressed retaining wall and a construction method thereof.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

the utility model provides a modularization assembled prestressing force retaining wall which characterized in that: the wall body single body secondary pouring belt comprises a bottom plate, a supporting arm, a wall body single body, a secondary pouring belt, a fixing block and a connecting plate, wherein the supporting arm, the wall body single body, the secondary pouring belt and a reserved slot of the fixing block are arranged on the bottom plate; the wall single bodies are in a plurality of groups, the outer side edge ends of the wall single bodies positioned between the adjacent wall single bodies and at the two ends are respectively provided with a supporting arm, the included angle between each wall single body and each supporting arm is 90 degrees, the supporting arms and the wall single bodies are connected through a connecting plate, the peripheries of the bottoms of the supporting arms and the wall single bodies are surrounded by fixing blocks, the bottom ends of the wall single bodies, the supporting arms and the fixing blocks are all inserted into reserved slots of the bottom plate, and secondary pouring belts are respectively filled at seams among the wall single bodies, the supporting arms and the fixing blocks; and reserved common steel bars and prestressed steel bar pore channels are arranged in the wall body monomer.

Furthermore, the supporting arm comprises an edge supporting arm and a middle supporting arm, the middle supporting arm is provided with a right-angle triangular body main body and a horizontally arranged rectangular body base, the right-angle triangular body main body is fixed on the rectangular body base, and a reinforcing steel bar ring is arranged on the side wall of the rectangular body base; the edge armrest arm is provided with a right-angle triangular body main body, a rectangular body base and a rectangular body side seat, wherein the rectangular body base is horizontally arranged, the rectangular body side seat is vertically arranged, the right-angle triangular body main body is fixed on the rectangular body base, the rectangular body side seat is vertically arranged and fixed on the side faces of the right-angle triangular body main body and the rectangular body base, and a reinforcing steel bar ring is arranged on the side wall of the rectangular body base.

Furthermore, the wall body monomer is divided into a left end wall body monomer, a right end wall body monomer and a middle wall body monomer, wherein the left end wall body monomer is formed by assembling a No. 1 wall body unit and two No. 4 wall body units from top to bottom, the middle wall body monomer is formed by assembling a No. 2 wall body unit and two No. 5 wall body units from top to bottom, and the right end wall body monomer is formed by assembling a No. 3 wall body unit and two No. 6 wall body units from top to bottom; the No. 1-6 wall units are all rectangular bodies, right side grooves are formed in the right end face of the No. 1 wall unit from top to bottom, and lower side bulges are formed in the lower end face of the No. 1 wall unit from left to right; the upper end face of the No. 4 wall unit is provided with an upper side groove, the lower end face of the No. 4 wall unit is provided with a lower side bulge from left to right, and the right end face of the No. 4 wall unit is provided with a right side groove from top to bottom; the left end face of the No. 2 wall unit is provided with a left protrusion from top to bottom, the right end face of the No. 2 wall unit is provided with a right groove from top to bottom, and the lower end face of the No. 2 wall unit is provided with a lower protrusion from left to right; the left end face of the No. 5 wall unit is provided with a left bulge from top to bottom, the upper end face of the No. 5 wall unit is provided with an upper side groove from left to right, the right end face of the No. 5 wall unit is provided with a right side groove from top to bottom, and the lower end face of the No. 5 wall unit is provided with a lower side bulge from left to right; the left end face of the No. 3 wall unit is provided with a left bulge from top to bottom, and the lower end face of the No. 3 wall unit is provided with a lower bulge from left to right; the upper end face of the No. 6 wall body unit is provided with an upper side groove from left to right, the lower end face of the No. 6 wall body unit is provided with a lower side bulge from left to right, and the left end face of the No. 6 wall body unit is provided with a left side bulge from top to bottom; the left side bulge is matched with the right side groove in size, and the lower side bulge is matched with the upper side groove in size; the upper and lower adjacent wall units are spliced through the lower side bulges and the upper side grooves, and the left and right adjacent wall units are spliced in an alignment way through the right side grooves and the left side bulges; a notch which is arranged in a penetrating manner from top to bottom is formed in one side, which is contacted with the supporting arm, of the edge end on the left side of the No. 1 or No. 4 wall unit, and a vertically arranged rectangular side seat of the supporting arm on the edge on the left side is arranged in the notch and is fixed with the wall unit through a connecting plate; a notch is formed in one side, which is contacted with the supporting arm, of the edge end on the right side of the No. 3 or No. 6 wall unit from top to bottom in a penetrating manner, and a vertically arranged rectangular body side seat of the supporting arm on the edge on the right side is arranged in the notch and is fixed with the wall unit through a connecting plate; the middle supporting arms are vertically arranged by abutting against the wall single bodies from top to bottom, wherein the middle lines abut against the connecting joints of the adjacent middle wall single bodies and are placed in the reserved slots of the bottom plate along the reinforcing steel bars.

Furthermore, No. 3 common steel bar pore channels are vertically reserved in the supporting arms, No. 1 prestressed steel bar pore channels are arranged at the corners of the No. 1-6 wall units, No. 2 prestressed steel bar pore channels are arranged on the side, far away from the supporting arms, of the No. 1-6 wall units, No. 2 common steel bar pore channels are arranged on the side, close to the supporting arms, of the No. 2 wall units, No. 3 common steel bar pore channels are arranged at the left side convex corners of the No. 5 wall units and No. 6 wall units; prestressed reinforcement anchor heads are embedded in the vertical bottom plates corresponding to the lower parts of the No. 1 prestressed reinforcement pore paths and the No. 2 prestressed reinforcement pore paths in advance, and anchorage devices are used for tensioning and fixing the prestressed reinforcements at the positions corresponding to the prestressed reinforcements of the topmost wall units; the upper and lower adjacent wall units are fixed through the vertical steel bars communicated in the pore channels; and a reserved screw is arranged on the side surface of the No. 1-6 wall unit.

Further, the fixed block includes the trapezoidal fixed block of minor face and the trapezoidal fixed block of long limit, and every is held up the arm bottom and is enclosed with the trapezoidal fixed block of a minor face and two long limit trapezoidal fixed blocks around, on the trapezoidal fixed block of minor face and the trapezoidal fixed block of long limit, hold up the side that the arm contacted and all be provided with the embedded steel bar hook on the trapezoidal fixed block of long limit and the side that the arm contacted, be provided with the reinforcing bar ring on the trapezoidal fixed block of long limit and the trapezoidal fixed block of minor face contacted, the embedded steel bar hook links to each other with adjacent reinforcing bar ring.

Further, the secondary pouring belt is poured with concrete.

Furthermore, the connecting plate is a thin steel plate and comprises a right-angle splicing connecting plate and a rectangular connecting plate, and bolt holes are formed in the connecting plate.

The construction method of the modular assembly type prestressed retaining wall comprises the following steps:

step 1, measuring and lofting, excavating a side slope soil body, and reporting, checking and rechecking;

step 2, leveling the site, performing construction preparation, and stacking all prefabricated components in the construction site for standby use according to engineering requirements;

step 3, erecting a bottom plate template, reserving a supporting arm and a reserved slot of a wall body during erection, reserving the width of a part of secondary casting belt, reproducing casting concrete curing until the strength is qualified, embedding prestressed reinforcement anchor heads in foundations at the corresponding positions of the No. 1 prestressed reinforcement pore passage and the No. 2 prestressed reinforcement pore passage before casting, and embedding corresponding prestressed reinforcements; embedding common steel bars at the corresponding positions of the No. 1 common steel bar pore passage, the No. 2 common steel bar pore passage and the No. 3 common steel bar pore passage in the supporting arm;

step 4, removing the foundation and the template at the fixed edge, and hoisting and splicing the wall units according to the sequence from left to right hoisting from bottom to top; after the first layer of wall units are installed, hoisting the supporting arms into the reserved slots; after each layer of wall units are laid, aligning the supporting arms and the wall units by using the connecting plates to reserve screws, and then screwing the nuts for fixing;

step 5, mounting an anchorage device on the tops of the number 1 prestressed reinforcement and the number 2 prestressed reinforcement which are specified at the upper parts after the integral structure is assembled, and tensioning the prestressed reinforcement;

step 6, fixing the periphery of the bottom of the supporting arm by using a fixing block, and overlapping the reinforcing steel bar ring with the adjacent reinforcing steel bar hook;

and 7, grouting in the prestressed reinforcement and common reinforcement pore canals and the secondary casting belt, and backfilling on one side of the supporting arm after the strength requirement is met.

The invention has the advantages and beneficial effects that:

the wall body and the supporting arms of the modular assembly type prestressed retaining wall are prefabricated components, so that the components are simple, the construction period is shortened, the operation is convenient, and the use amount of manpower and wood is greatly reduced by an assembly type method. The wall body is formed by assembling six wall body units, the upper part, the lower part, the left part and the right part of each wall body unit can be perfectly spliced through the arranged grooves and the arranged bulges, the integrity is stable and reliable, the transportation and the installation are convenient, the height and the span of the retaining wall can be adjusted according to the actual engineering, the connection mode among all the components is reliable, and the stress is reasonable. The invention adopts partial prestressed reinforcement, can firstly generate certain compressive stress in the cross section in an effective tension area to resist the tensile stress generated on the cross section of the wall body under the soil pressure, thus greatly relieving the deformation of the structure and improving the stability and durability of the whole structure.

Drawings

The invention is described in detail below with reference to the following figures and examples:

FIG. 1 is a schematic view of the overall structure of a modular fabricated prestressed retaining wall according to the present invention;

FIG. 2 is a schematic plan view of the modular prefabricated prestressed retaining wall of the present invention;

FIG. 3 is a schematic view of an edge arm structure;

FIG. 4 is a schematic view of the structure of the middle armrest;

FIG. 5 is a schematic diagram of wall unit assembly;

FIG. 6 is a schematic structural view of wall unit No. 1;

FIG. 7 is a layout diagram of the longitudinal steel bars preset in the wall;

FIG. 8 is a schematic view of a short trapezoidal fixing block;

FIG. 9 is a schematic view of a long-side trapezoidal fixing block;

FIG. 10 is a schematic diagram of a right-angled connecting plate structure;

FIG. 11 is a schematic view of a rectangular connecting plate;

fig. 12 is an overall cross-sectional view schematically.

In the figure: the wall body comprises a bottom plate 1, a supporting arm 2, a wall body monomer 3, a secondary casting belt 4, a fixing block 5, a connecting plate 6, a hanging ring 10, an edge supporting arm 2-1, a middle supporting arm 2-2, a reinforcing steel ring 2-4, a wall body unit No. 1 3-1, a wall body unit No. 2-2, a wall body unit No. 3-3, a wall body unit No. 4, a wall body unit No. 5, a wall body unit No. 6, a right groove 3-12, a lower protrusion 3-13, an upper groove 3-14, a left protrusion 3-11, a common reinforcing steel bar pore passage No. 3-3, a prestressed reinforcing steel bar pore passage No. 1 3-7, a prestressed reinforcing steel bar pore passage No. 2, a common reinforcing steel bar pore passage No. 1, a prestressed reinforcing steel bar anchor head 9, a reinforcing steel bar prestressed steel bar anchor head 9, a middle supporting arm 2-1, a reinforcing steel bar ring 3-4, a reinforcing steel bar ring 3-6, a right groove 3-12, a lower protrusion 3-13, an upper groove 3-14, a lower groove 3, a middle groove, The device comprises an anchorage 8, a reserved screw 3-15, a short-side trapezoidal fixed block 5-1, a long-side trapezoidal fixed block 5-2, a reinforcing steel bar hook 5-3, a reinforcing steel bar ring 5-4, a connecting plate 6, a right-angle splicing connecting plate 6-1, a rectangular connecting plate 6-2 and a bolt hole 6-3.

Detailed Description

As shown in fig. 1 and 2, the modular assembly type prestressed retaining wall of the present invention comprises a bottom plate 1, a supporting arm 2, a single wall body 3, a secondary casting belt 4, a fixing block 5 and a connecting plate 6, wherein the bottom plate 1 is cast in situ by supporting a template after measurement and lofting, and reserved slots of the supporting arm 2, the single wall body 3, the secondary casting belt and the fixing block 5 are arranged therebetween, and the depth of the reserved slots is 100 mm and 250 mm; the wall single bodies are divided into a plurality of groups, the outer side edge ends of the wall single bodies positioned between the adjacent wall single bodies and at the two ends are respectively provided with a supporting arm 2, the included angle between each wall single body and each supporting arm is 90 degrees, the wall single bodies and the supporting arms are connected through a connecting plate 6, the peripheries of the bottoms of the supporting arms 2 and the wall single bodies 3 are surrounded by fixing blocks 5, the bottom ends of the wall single bodies, the supporting arms and the fixing blocks are all tightly inserted into reserved slots of the bottom plate 1, and secondary pouring belts 4 are respectively filled at seams among the wall single bodies, the supporting arms and the fixing blocks 5; and reserved common steel bars and prestressed steel bar pore passages are arranged in the wall body monomer, and the diameter of the pore passages is 3-5 cm.

The height of the supporting arm is 300-450 mm. The supporting arms comprise an edge supporting arm 2-1 and a middle supporting arm 2-2, as shown in fig. 4, the middle supporting arm is provided with a right-angled triangle body and a horizontally arranged rectangular base, the right-angled triangle body is fixed on the rectangular base, and a reinforcing ring 2-4 is arranged on the side wall of the rectangular base; as shown in fig. 3, the edge arm 2-1 has a right triangle body, a horizontally disposed rectangular base, and a vertically disposed rectangular side seat, the right triangle body is fixed on the rectangular base, the vertically disposed rectangular side seat is fixed on the side surfaces of the right triangle body and the rectangular base, and the side wall of the rectangular base is provided with a reinforcement ring 2-4.

As shown in fig. 5 and 6, the wall body single bodies are divided into a left end wall body single body, a right end wall body single body and a middle wall body single body, wherein the left end wall body single body is formed by assembling a No. 1 wall body unit 3-1 and two No. 4 wall body units 3-4 from top to bottom, the middle wall body single body is formed by assembling a No. 2 wall body unit 3-2 and two No. 5 wall body units 3-5 from top to bottom, and the right end wall body single body is formed by assembling a No. 3 wall body unit 3-3 and two No. 6 wall body units 3-6 from top to bottom; the No. 1-6 wall units are all rectangular bodies, right side grooves 3-12 are formed in the right end face of the No. 1 wall unit from top to bottom, and lower side protrusions 3-13 are formed in the lower end face of the No. 1 wall unit from left to right; the upper end face of the No. 4 wall unit is provided with upper side grooves 3-14, the lower end face of the No. 4 wall unit is provided with lower side bulges from left to right, and the right end face of the No. 4 wall unit is provided with a right side groove from top to bottom; the left end face of the No. 2 wall unit 3-2 is provided with a left bulge 3-11, the right end face of the No. 2 wall unit is provided with a right groove, and the lower end face of the No. 2 wall unit is provided with a lower bulge; the left end face of the No. 5 wall unit 3-5 is provided with a left bulge, the upper end face of the No. 5 wall unit is provided with an upper side groove, the right end face of the No. 5 wall unit is provided with a right side groove, and the lower end face of the No. 5 wall unit is provided with a lower side bulge; the left end face of the No. 3 wall unit 3-3 is provided with a left side bulge, and the lower end face of the No. 3 wall unit is provided with a lower side bulge; the upper end surfaces of the No. 6 wall units 3-6 are provided with upper side grooves, the lower end surfaces of the No. 6 wall units are provided with lower side bulges, and the left end surfaces of the No. 6 wall units are provided with left side bulges from top to bottom; the left side bulge is matched with the right side groove in size, and the lower side bulge is matched with the upper side groove in size; the upper and lower adjacent wall units are spliced through the lower side bulges and the upper side grooves, and the left and right adjacent wall units are spliced in an alignment way through the right side grooves and the left side bulges; a notch which is arranged in a penetrating manner from top to bottom is formed in one side, which is contacted with the supporting arm, of the edge end on the left side of the No. 1 or No. 4 wall unit, and a vertically arranged rectangular side seat of the supporting arm on the edge on the left side is arranged in the notch and is fixed with the wall unit through a connecting plate; a notch is formed in one side, which is contacted with the supporting arm, of the edge end on the right side of the No. 3 or No. 6 wall unit from top to bottom in a penetrating manner, and a vertically arranged rectangular body side seat of the supporting arm on the edge on the right side is arranged in the notch and is fixed with the wall unit through a connecting plate; the middle supporting arms 2-2 are vertically arranged by being attached to the wall single bodies from top to bottom, wherein the middle lines of the middle supporting arms are closely attached to the connecting joints of the adjacent middle wall single bodies and are placed in the slots of the bottom plate along the reinforcing steel bars.

As shown in fig. 5, 6, 7 and 12, a number 3 common steel bar hole channel 2-3 is reserved in the supporting arm vertically, the number 1 pre-stressed steel bar hole channel 3-7 is arranged at the corner of each number 1-6 wall unit, the number 2 pre-stressed steel bar hole channel 3-8 is arranged on the number 1-6 wall unit far away from the supporting arm, the number 2 common steel bar hole channel 3-9 is arranged close to one side of the supporting arm, and the number 1 common steel bar hole channel 3-10 is arranged at the corner of the left protrusion 3-11 of the number 2, 3, 5 and 6 wall units; prestressed reinforcement anchor heads 9 are embedded in the vertical bottom plates 1 corresponding to the lower parts of the No. 1 prestressed reinforcement pore paths 3-7 and the No. 2 prestressed reinforcement pore paths 3-8 in advance, and the prestressed reinforcements are tensioned and fixed at the positions corresponding to the prestressed reinforcements of the topmost wall units by using anchorage devices 8; the upper and lower adjacent wall units are fixed through the vertical steel bars communicated in the pore channels; and the side surface of the No. 1-6 wall unit is provided with reserved screws 3-15. The wall unit 3, the handrail 2 and the fixed block 5 are all prefabricated in a factory and then spliced on site. Hoisting rings 10 are arranged on two sides of the supporting arm and the wall unit.

The fixed blocks 5 comprise short-edge trapezoidal fixed blocks 5-1 and long-edge trapezoidal fixed blocks 5-2, the periphery of the bottom of each supporting arm is surrounded by one short-edge trapezoidal fixed block 5-1 and two long-edge trapezoidal fixed blocks 5-2, as shown in figure 8, embedded steel bar hooks 5-3 are arranged on the side face, in contact with the long-edge trapezoidal fixed block 5-2 and the supporting arm, of the short-edge trapezoidal fixed block 5-1 and the side face, in contact with the supporting arm, of the long-edge trapezoidal fixed block 5-2, as shown in figure 9, steel bar rings 5-4 are arranged on the side face, in contact with the short-edge trapezoidal fixed block, of the long-edge trapezoidal fixed block 52, and the embedded steel bar hooks are connected with adjacent steel bar rings.

And pouring concrete into the secondary pouring belt.

As shown in fig. 10 and 11, the connecting plate 6 is a thin steel plate and comprises a right-angle splicing connecting plate 6-1 and a rectangular connecting plate 6-2, and bolt holes 6-3 are formed in the connecting plate.

A construction method of a modular assembly type prestressed retaining wall comprises the following steps:

step 3, erecting a foundation and a bottom plate 1 template, reserving a reserved slot of a supporting arm and a wall body when erecting, reserving the width of a part of secondary casting belt, reproducing cast concrete maintenance until the strength is qualified, embedding a prestressed reinforcement anchor head 9 in the foundation at the corresponding position of the No. 1 prestressed reinforcement pore passage 3-7 and the No. 2 prestressed reinforcement pore passage 3-8 before casting, and embedding corresponding prestressed reinforcements; embedding common steel bars at the positions corresponding to the common steel bar hole channels 3-10 and 3-9 of the common steel bar hole channel 1 and the common steel bar hole channel 3-3 of the armrest arm 2;

and 4, removing the templates at the foundation and the fixed edge, hoisting the wall units from left to right, hoisting the wall units layer by layer from top to bottom and from left to right sequentially, and fixing the wall units according to positions. In the process, the steel bar hook in the groove of the bottom plate is aligned with the reserved steel bar ring at the bottom of the supporting arm. Then, after the first layer of wall units are installed, lifting the supporting arms into the reserved slots; after each layer of wall units are laid, aligning the supporting arms and the wall units by using the connecting plates to reserve screws, and then screwing the nuts for fixing;

step 5, mounting an anchorage 8 on the tops of the number 1 prestressed reinforcement and the number 2 prestressed reinforcement which are specified at the upper parts after the integral structure is assembled, and tensioning the prestressed reinforcements;

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a modularization assembled prestressing force retaining wall which characterized in that: the wall body single body casting device comprises a bottom plate (1), a supporting arm (2), a wall body single body (3), a secondary casting belt (4), a fixing block (5) and a connecting plate (6), wherein reserved slots of the supporting arm (2), the wall body single body (3), the secondary casting belt and the fixing block (5) are formed in the bottom plate (1); the wall single bodies are divided into a plurality of groups, the outer side edge ends of the wall single bodies positioned between the adjacent wall single bodies and at the two ends are respectively provided with a supporting arm (2), the included angle between each wall single body and each supporting arm is 90 degrees, the wall single bodies and the supporting arms are connected through a connecting plate (6), the supporting arms (2) and the wall single bodies (3) are surrounded by fixing blocks (5), the bottom ends of the wall single bodies, the supporting arms and the fixing blocks are all inserted into reserved slots of the bottom plate (1), and secondary pouring belts (4) are respectively filled at seams among the wall single bodies, the supporting arms and the fixing blocks (5); and reserved common steel bars and prestressed steel bar pore channels are arranged in the wall body monomer.

2. The modular fabricated prestressed retaining wall of claim 1, wherein: the supporting arm comprises an edge supporting arm (2-1) and a middle supporting arm (2-2), the middle supporting arm is provided with a right-angle triangular body main body and a rectangular body base which is horizontally arranged, the right-angle triangular body main body is fixed on the rectangular body base, and a reinforcing steel bar ring is arranged on the side wall of the rectangular body base; the edge armrest arm (2-1) is provided with a right-angle triangular body main body, a horizontally arranged rectangular body base and a vertically arranged rectangular body side seat, the right-angle triangular body main body is fixed on the rectangular body base, the vertically arranged rectangular body side seat is fixed on the side faces of the right-angle triangular body main body and the rectangular body base, and a reinforcing steel bar ring is arranged on the side wall of the rectangular body base.

3. The modular fabricated prestressed retaining wall of claim 2, characterized in that: the wall body monomer is divided into a left end wall body monomer, a right end wall body monomer and a middle wall body monomer, wherein the left end wall body monomer is formed by assembling a No. 1 wall body unit (3-1) and two No. 4 wall body units (3-4) from top to bottom, the middle wall body monomer is formed by assembling a No. 2 wall body unit (3-2) and two No. 5 wall body units (3-5) from top to bottom, and the right end wall body monomer is formed by assembling a No. 3 wall body unit (3-3) and two No. 6 wall body units (3-6) from top to bottom; the No. 1-6 wall units are all rectangular bodies, right side grooves are formed in the right end face of the No. 1 wall unit from top to bottom, and lower side bulges are formed in the lower end face of the No. 1 wall unit from left to right; the upper end face of the No. 4 wall unit is provided with an upper side groove, the lower end face of the No. 4 wall unit is provided with a lower side bulge from left to right, and the right end face of the No. 4 wall unit is provided with a right side groove from top to bottom; the left end face of the No. 2 wall unit (3-2) is provided with a left protrusion (3-11) from top to bottom, the right end face of the No. 2 wall unit is provided with a right groove from top to bottom, and the lower end face of the No. 2 wall unit is provided with a lower protrusion from left to right; the left end face of the No. 5 wall unit (3-5) is provided with a left protrusion from top to bottom, the upper end face of the No. 5 wall unit is provided with an upper groove from left to right, the right end face of the No. 5 wall unit is provided with a right groove from top to bottom, and the lower end face of the No. 5 wall unit is provided with a lower protrusion from left to right; the left end face of the No. 3 wall body unit (3-3) is provided with a left side bulge from top to bottom, and the lower end face of the No. 3 wall body unit is provided with a lower side bulge from left to right; the upper end face of the No. 6 wall body unit (3-6) is provided with an upper side groove from left to right, the lower end face of the No. 6 wall body unit is provided with a lower side bulge from left to right, and the left end face of the No. 6 wall body unit is provided with a left side bulge from top to bottom; the left side bulge is matched with the right side groove in size, and the lower side bulge is matched with the upper side groove in size; the upper and lower adjacent wall units are spliced through the lower side bulges and the upper side grooves, and the left and right adjacent wall units are spliced in an alignment way through the right side grooves and the left side bulges; a notch which is arranged in a penetrating manner from top to bottom is formed in one side, which is contacted with the supporting arm, of the edge end on the left side of the No. 1 or No. 4 wall unit, and a vertically arranged rectangular side seat of the supporting arm on the edge on the left side is arranged in the notch and is fixed with the wall unit through a connecting plate; a notch is formed in one side, which is contacted with the supporting arm, of the edge end on the right side of the No. 3 or No. 6 wall unit from top to bottom in a penetrating manner, and a vertically arranged rectangular body side seat of the supporting arm on the edge on the right side is arranged in the notch and is fixed with the wall unit through a connecting plate; the middle supporting arms (2-2) are vertically arranged by being attached to the wall single bodies from top to bottom, wherein the middle lines of the middle supporting arms are tightly attached to the connecting joints of the adjacent middle wall single bodies and are placed in the reserved slots of the bottom plate along the reinforcing steel bars.

4. The modular fabricated prestressed retaining wall of claim 3, characterized in that: a common steel bar hole channel No. 3 (2-3) is reserved in the supporting arm in a vertical mode, a prestressed steel bar hole channel No. 1 (3-7) is arranged at the corner of each wall body unit No. 1-6, a prestressed steel bar hole channel No. 2 (3-8) is arranged on one side, far away from the supporting arm, of each wall body unit No. 1-6, a common steel bar hole channel No. 2 (3-9) is arranged on one side close to the supporting arm, and a common steel bar hole channel No. 1 (3-10) is arranged at the corner of a left protrusion (3-11) of each wall body unit No. 2, 3, 5 and 6; prestressed reinforcement anchor heads (9) are embedded in the vertical bottom plates (1) corresponding to the lower parts of the No. 1 prestressed reinforcement pore paths (3-7) and the No. 2 prestressed reinforcement pore paths (3-8) in advance, and the prestressed reinforcements are tensioned and fixed by using anchorage devices (8) at the positions corresponding to the prestressed reinforcements of the topmost wall unit; the upper and lower adjacent wall units are fixed through the vertical steel bars communicated in the pore channels; reserved screws (3-15) are arranged on the side surfaces of the No. 1-6 wall units.

5. The modular fabricated prestressed retaining wall of claim 1, wherein: the fixed block (5) comprises short-edge trapezoidal fixed blocks (5-1) and long-edge trapezoidal fixed blocks (5-2), the periphery of the bottom of each supporting arm is surrounded by the short-edge trapezoidal fixed block (5-1) and the two long-edge trapezoidal fixed blocks (5-2), embedded steel bar hooks (5-3) are arranged on the side face where the short-edge trapezoidal fixed block (5-1), the long-edge trapezoidal fixed block (5-2) and the supporting arm are contacted, and the side face where the long-edge trapezoidal fixed block (5-2) and the supporting arm are contacted, steel bar rings are arranged on the side face where the long-edge trapezoidal fixed block (5-2) and the short-edge trapezoidal fixed block are contacted, and the embedded steel bar hooks are connected with the adjacent steel bar rings.

6. The modular fabricated prestressed retaining wall of claim 1, wherein: and pouring concrete into the secondary pouring belt.

7. The modular fabricated prestressed retaining wall of claim 1, wherein: the connecting plate (6) is a thin steel plate and comprises a right-angle splicing connecting plate (6-1) and a rectangular connecting plate (6-2), and bolt holes (6-3) are formed in the connecting plate.

8. A construction method of a modular fabricated prestressed retaining wall according to claims 1-7, characterized by comprising the steps of:

step 3, erecting a template of the bottom plate (1), reserving a reserved slot of the supporting arm and the wall body when erecting, reserving the width of a part of secondary casting zone, reproducing cast concrete maintenance until the strength is qualified, embedding a prestressed reinforcement anchor head (9) in a foundation at the corresponding position of the No. 1 prestressed reinforcement pore passage (3-7) and the No. 2 prestressed reinforcement pore passage (3-8) before casting, and embedding corresponding prestressed reinforcements; embedding common steel bars at the corresponding positions of the No. 1 common steel bar pore canal (3-10), the No. 2 common steel bar pore canal (3-9) and the No. 3 common steel bar pore canal (2-3) in the armrest arm (2);

step 5, mounting an anchorage device (8) at the tops of the number 1 prestressed reinforcement and the number 2 prestressed reinforcement which are specified at the upper parts after the integral structure is assembled, and tensioning the prestressed reinforcements;