CN110439007B - Pile plate U-shaped supporting and retaining load reduction structure and construction process - Google Patents
Pile plate U-shaped supporting and retaining load reduction structure and construction process Download PDFInfo
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Abstract
The invention belongs to the technical field of load reduction application of composite retaining building structures, and relates to a pile plate U-shaped retaining load reduction structure and a construction process, wherein the pile plate U-shaped retaining load reduction structure comprises a rectangular-section anti-slide pile, a load reduction block, a flexible filler EPS plate and a rectangular steel plate; the number of the rectangular cross section slide-resistant piles is multiple; the load reduction block is parallel to the rectangular cross-section slide-resistant pile and is fixedly connected with the rectangular cross-section slide-resistant pile; the rectangular steel plates are arranged on the two adjacent rectangular-section anti-slide piles and form a firm supporting and load-reducing structure with a U-shaped cross section with the two adjacent rectangular-section anti-slide piles; the flexible filler EPS board is filled in the U-shaped supporting and load reducing structure and is attached to the rectangular steel plate; the U-shaped supporting and load reducing structure extends from the stable soil body to the unstable soil body from top to bottom. The invention provides a pile plate U-shaped supporting and retaining load reduction structure and a construction process, which can greatly reduce the pressure of wall back soil to achieve the load reduction effect and have relatively simple construction process.
Description
Technical Field
The invention belongs to the technical field of load reduction application of composite supporting and retaining building structures, relates to a supporting and retaining load reduction structure and a construction process, and particularly relates to a pile plate U-shaped supporting and retaining load reduction structure and a construction process.
Background
The supporting and retaining structure is widely applied to civil and architectural engineering, railways, road traffic, water conservancy and hydropower engineering. With the development of economic construction and scientific technology, the requirements on the retaining building structure are higher and higher, and at present, the load shedding analysis and load shedding design treatment measures related to the retaining structure are few, and further development is needed. Due to the wide application of the retaining structure, the structural form and the application position of the retaining structure become more important, and the load shedding performance and the mechanism of the retaining structure should be further discussed and researched.
At present, deep analysis and design research on the load reduction of the side slope retaining structure in the regions is lacked. The existing retaining structure has the following defects in the load shedding aspect: (1) lack of corresponding load shedding theory; (2) lack of corresponding load shedding means; (3) the construction process of corresponding load shedding is lacked. A large number of retaining walls are used in the retaining structure, no help is provided for load reduction, huge resource waste is generated, and construction is influenced.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides the pile plate U-shaped supporting and load reducing structure and the construction process, which can greatly reduce the pressure of wall back soil to achieve the load reducing effect and have relatively simple construction process.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a pile plate U type fender structure of shedding which characterized in that: the pile plate U-shaped supporting and load reducing structure comprises an anti-slide pile with a rectangular cross section, a load reducing block, a flexible filler EPS plate and a rectangular steel plate; the number of the rectangular cross-section slide-resistant piles is multiple; the load shedding block is parallel to the slide-resistant pile with the rectangular cross section and is fixedly connected with the slide-resistant pile with the rectangular cross section; the rectangular steel plates are arranged on the two adjacent rectangular-section anti-slide piles and form a firm supporting and load-reducing structure with a U-shaped cross section with the two adjacent rectangular-section anti-slide piles; the flexible filler EPS board is filled in the U-shaped supporting and load reducing structure and is attached to the rectangular steel plate; the U-shaped supporting and load reducing structure extends from the stable soil body to the unstable soil body from top to bottom.
Preferably, the size of the wide and thick cross section of the rectangular cross section slide-resistant pile adopted by the invention is a x b, the distance between the axes of two adjacent rectangular cross section slide-resistant piles is c, the total length of the rectangular cross section slide-resistant pile is d, the length of the rectangular cross section slide-resistant pile above the ground is e, the length of the rectangular cross section slide-resistant pile under the buried soil is d-e, and the units are m.
Preferably, the relief block used in the present invention has a thickness f of b/4, a width a and a height e.
Preferably, the rectangular steel plate used in the present invention has a height e, a width c, and a thickness i of 5 to 20 mm.
Preferably, the flexible filler EPS board adopted by the invention has the width of c-a, the height of e and the thickness of h1The value of (b) is b/20-b/5, and the value of the density rho is 10-30 kg/m3。
Preferably, the flexible filler EPS boards used in the invention have a thickness h1The value of (b) is b/10.
The utility model provides a construction technology of pile sheet U type fender structure that subtracts carries which characterized in that: the construction process comprises the following steps:
1) pouring after manual excavation treatment to obtain rectangular cross-section anti-slide piles, wherein the number of the rectangular cross-section anti-slide piles is multiple; the size of the wide and thick sections of the rectangular-section slide-resistant piles is axb, the distance between the axes of two adjacent rectangular-section slide-resistant piles is c, the total length of the rectangular-section slide-resistant piles is d, the length of the rectangular-section slide-resistant piles above the ground is e, the length of the rectangular-section slide-resistant piles under the buried soil is d-e, and the units are m;
2) arranging a load reduction block corresponding to the rectangular-section slide-resistant pile structure on one side, facing the soil body, of the rectangular-section slide-resistant pile, wherein the load reduction block and the rectangular-section slide-resistant pile form a whole;
3) two adjacent rectangular-section anti-slide piles are taken as structural units, rectangular steel plates are arranged on the side of the anti-slide piles, which is back to the soil body, and the rectangular steel plates and the rectangular-section anti-slide piles jointly form a supporting and load-reducing structure with the whole cross section being U-shaped;
4) placing flexible filler in the U-shaped supporting and load reducing structure prepared in the step 3); the flexible filler is attached to the rectangular steel plate,
preferably, the specific implementation manner of step 2) adopted by the invention is as follows: placing a load reduction block on one side, facing the soil body, of the rectangular-section slide-resistant pile, and binding and fixing the load reduction block and the rectangular-section slide-resistant pile through steel wires; the thickness f of the load reducing block is b/4, the width is a, and the height is e.
Preferably, the specific implementation manner of step 3) adopted by the invention is as follows: the method comprises the following steps of taking two adjacent rectangular-section slide-resistant piles as structural units, installing rectangular steel plates on one sides, back to a soil body, of the rectangular-section slide-resistant piles, and firmly connecting the two adjacent rectangular-section slide-resistant piles and the rectangular steel plates through fixed hinge supports to form a supporting and load-reducing structure with a U-shaped cross section, wherein the rectangular steel plates are e in height, c in width and 5-20 mm in thickness i.
Preferably, the specific implementation manner of step 4) adopted by the invention is as follows: the flexible packing EPS boards are vertically placed in the U-shaped supporting and load reducing structure, the width of each flexible packing EPS board is c-a, the height of each flexible packing EPS board is e, and the thickness of each flexible packing EPS board is h1The value of (b) is b/20-b/5, and the value of the density rho is 10-30 kg/m3(ii) a The thickness h of the flexible filler EPS board1The value of (A) is preferably b/10.
The invention has the advantages that:
because the deformation modulus of the EPS boards in the U-shaped retaining and load-reducing structure is smaller than that of the dense soil body of the wall back, the EPS boards can generate larger deformation under the action of horizontal soil pressure, the difference value of the horizontal displacement of the soil body behind the wall back and the soil body behind the EPS boards is reduced, and the horizontal friction resistance tau at the shearing surfaces of two adjacent slide-resistant piles and the U-shaped load-reducing groove is enabled to be larger1、τ2The horizontal soil pressure acting on the U-shaped baffle is transferred to the anti-slide pile and the load shedding block, so that the effect of horizontal soil pressure load shedding is achieved. The invention is suitable for the condition that landslide is easily generated due to instability of slope soil bodies such as side slopes in mountainous areas and high fill embankments. Compared with the existing retaining structure, the invention has the advantages that the U-shaped load reduction groove is simply and conveniently designed, the flexible filler EPS boards are laid, the load reduction factor is considered, the wall back soil pressure can be greatly reduced, the load reduction effect is achieved, and the construction process is relatively simple. Therefore, the load reduction analysis and design of the slope retaining structure in the regions are deeply researchedThe research has great practical significance for ensuring the use safety of roads, railways and buildings and reducing the harm of landslide and debris flow to the roads, the railways and the buildings.
Drawings
FIG. 1 is a perspective view of a pile-plate U-shaped supporting structure unit for load reduction according to the present invention;
FIG. 2 is a three-dimensional view of a pile-plate U-shaped retaining and load-shedding structural unit provided by the present invention;
FIG. 3 is a simplified diagram of a pile-plate force calculation provided by the present invention;
in the figure:
1-a load shedding block; 2-rectangular cross section slide-resistant piles; 3-flexible filler EPS board; 4-a steel plate; i-stabilizing a soil mass; II-unstable soil mass.
Detailed Description
Referring to fig. 1, the invention firstly provides a pile plate U-shaped supporting and load reducing structure, which comprises rectangular-section anti-slide piles 2, load reducing blocks 1, flexible filler EPS plates 3 and rectangular steel plates 4; the rectangular cross section slide-resistant piles 2 are multiple; the load reduction block 1 is parallel to the rectangular cross section slide-resistant pile 2 and is fixedly connected with the rectangular cross section slide-resistant pile 2; the rectangular steel plates 4 are arranged on the two adjacent rectangular-section anti-slide piles 2 and form a firm supporting and load-reducing structure with a U-shaped cross section with the two adjacent rectangular-section anti-slide piles 2; the flexible filler EPS board 3 is filled in the U-shaped retaining and load-reducing structure and is attached to the rectangular steel plate 4; the U-shaped supporting and load reducing structure extends from the stable soil body I to the unstable soil body II from top to bottom.
Wherein: referring to fig. 2, the width and thickness of the rectangular cross-section friction pile 2 are a × b, the distance between the axes of two adjacent rectangular cross-section friction piles 2 is c, the total length of the rectangular cross-section friction pile 2 is d, the length above the ground of the rectangular cross-section friction pile 2 is e, the length under the soil of the rectangular cross-section friction pile 2 is d-e, and the units are m; the thickness f of the load reducing block 1 is b/4, the width is a, and the height is e; the rectangular steel plate 4 is e in height, c in width and 5-20 mm in thickness i; the flexible filler EPS board 3 has the width of c-a, the height of e and the thickness of h1The value of (b) is b/20-b/5, and the value of the density rho is 10-30 kg/m3(ii) a Thickness h of flexible filler EPS board 31The value of (b) is b/10.
Meanwhile, the invention also provides a construction process of the pile plate U-shaped supporting and load reducing structure, which comprises the following steps:
(1) and pouring to obtain the rectangular-section slide-resistant piles 2 after manual excavation treatment (the size of the manually excavated foundation pit is determined according to the section size of the rectangular-section slide-resistant piles), and repeating the steps to obtain a plurality of rectangular-section slide-resistant piles 2. The size of the wide and thick sections of the rectangular section slide-resistant piles 2 is a multiplied by b, the distance between the axes of two adjacent rectangular section slide-resistant piles 2 is c, the total length of the piles is d, the length above the ground of the piles is e, and the length under the buried soil of the piles is d-e (unit: m);
(2) the load reduction block 1 with the corresponding size is arranged on one side, facing the soil body, of the slide-resistant pile 2 with the rectangular cross section, and the load reduction block and the slide-resistant pile 2 with the rectangular cross section form a whole, and specifically, the load reduction block is characterized in that: as shown in figure 1, a load reduction block 1 is placed on one side of the rectangular-section slide-resistant pile 2 facing the soil body, and is bound and fixed with the rectangular-section slide-resistant pile 2 through steel wires. The dimensions of the concrete relief block are as follows: the thickness f is b/4, the width a and the height e.
(3) Two adjacent rectangular cross section friction pile 2 are used as the constitutional unit, at its soil body one side installation rectangle steel sheet 4 of dorsad, form a U type fender load shedding structure, specifically are: as shown in figure 1, two adjacent anti-slide piles 2 with rectangular cross sections are taken as structural units, rectangular steel plates 4 are installed on the sides of the anti-slide piles 2, which are opposite to the soil body, the two adjacent anti-slide piles 2 with the rectangular cross sections are firmly connected with the rectangular steel plates 4 through fixed hinge supports to form a U-shaped supporting and load reducing structure, the height of each steel plate is e, the width of each steel plate is c, and the thickness of each steel plate is 5-20 mm.
(4) Place flexible filler, like polystyrene foam (EPS board) in U type fender load shedding structure inside, specifically be: as shown in fig. 1, the flexible packing EPS plate 3 is vertically placed in the U-shaped supporting and load-reducing structure, and the specific physical parameters of the EPS plate are as follows: the width of the EPS board is c-a, the height is e, and the thickness is h1The value of (b) is b/20-b/5, and the value of the density rho is 10-30 kg/m3Wherein the thickness h1The preferred value is b/10.
(5) Carrying out stress analysis calculation on the U-shaped supporting and load reducing structure:
5.1) to the U-shaped retaining deloading junctionThe structural units are subjected to load shedding stress analysis and calculation, the horizontal soil pressure of the back of the wall of the U-shaped retaining structure is calculated as shown in figure 3, the C point is subjected to moment taking, and if sigma Mc is 0, the moment is taken
According to the theory of the pressure of the lang-gold soil,
wherein KpIs a passive earth pressure coefficient, KaThe active soil pressure coefficient, gamma is the weight of the soil body on the wall back and the cohesive force c of the soil0Ignore not counted as 0; x is the number of1The soil pressure is 0 point to the length from the ground of the foundation pit, x2The length from the soil pressure of 0 point to the pile bottom, P1For passive earth pressure, P2Active earth pressure.
5.2) only considering the part above the ground of the pile, simplifying the pile-plate and the load reduction block into a whole with one end fixed and the cantilever beam structure with one free end uniformly loaded, wherein the uniformly loaded size is the active soil pressure
5.3) considering the plastic phase of the flexible filler EPS plate 3 as the elastic change, so that the elastic modulus coefficients of the elastic phase and the plastic phase of the flexible filler EPS are respectively assumed to be E1、E2(ii) a The soil discharge pressure is respectively delta P1、ΔP2. Carrying out stress analysis on the horizontal deformation of the U-shaped supporting and retaining load-reducing structure, and according to the elastic mechanics knowledge, carrying out horizontal displacement difference delta caused by the rigidity difference between a flexible filler EPS board and a wall back soil body in the U-shaped supporting and retaining load-reducing structure1Calculated from the following equation:
wherein EsIs the deformation modulus coefficient, mu, of the wall back soil body1Is the Poisson's ratio of the wall back soil body, K1The horizontal displacement influence coefficient is related to the ratio of the height e and the width c of the steel plate. In the formula K1The values for the horizontal displacement influence coefficient are used in table 1 below.
TABLE 1 horizontal displacement influence coefficient
5.4) compressive deformation δ produced by Flexible Filler EPS Panel2Obtained from the following equation:
wherein the values of the soil pressure Delta P for dumping are respectively Delta P1、ΔP2The thickness of the EPS board is h1The value of the elastic modulus coefficient E of the EPS board is divided into E1、E2Two cases.
5.5) summarizing the steps described above, by1＝δ2The equation of the upper formula (c) can be combined, (c) the soil unloading pressure of the EPS board can be obtained as follows:
the horizontal stress balance can be obtained, and the soil pressure after the load reduction of the EPS plate is considered as
The above formula is applicable to the present invention, but not limited thereto.
As shown in fig. 1, the pile-plate U-shaped supporting and load-reducing structure comprises a load-reducing block 1, a rectangular-section anti-slide pile 2, a flexible filler EPS plate 3 and a rectangular steel plate 4. The steel plate, the anti-slide pile and the load reduction block are integrally formed into a U-shaped retaining structure, and a load reduction mode is achieved by laying a flexible filler EPS plate.
Rectangular section friction pile 2 is through artifical excavation, and it is fixed that deloading piece 1 and friction pile 2 pass through the steel wire ligature, and rectangular section friction pile 2 carries out firm connection through the fixed hinge support with rectangular steel sheet 4, and wherein fixed hinge support and rectangular steel sheet 4 are the steel construction, the production of being convenient for, fixed hinge support accessible mechanical assembly carries out erection joint with the friction pile, belongs to a common technique in the engineering.
The size of the wide and thick sections of the rectangular section slide-resistant pile 2 is 1.5m multiplied by 2m, the total length of the pile is 16m, the length under the buried soil is 8m, the length of the pile above the ground is 8m, and the distance between the axes of the slide-resistant piles is 7 m; the dimensions of the deloading block 1 are as follows: the thickness is 0.5m, the width is 1.5m, and the height is 8 m; the rectangular steel plate 4 has a width of 7 m.
Density ρ and thickness h of EPS plate 31Are respectively 25kg/m30.2m, height 8m, modulus of elasticity E1、E2Respectively at 0.1MPa and 0.2MPa, and Poisson ratio mu2Is 0.2.
The height h of the wall back soil body is 8m, and the elastic modulus Es30MPa, Poisson's ratio mu1Is 0.3, gamma is 18KN/m3Angle of internal friction
Is 30 deg..
In this embodiment, according to the load shedding stress calculation method in the step (5) of the invention, the concrete parameters are substituted into a formula (I) to calculate the soil pressure Δ P of the soil respectively shed in the elastic stage and the plastic stage1＝20587.84N、ΔP241175.68N. After the flexible load-reducing material EPS board is laid, in the height of wall back filled soil, in the two stages of elasticity and plasticity, the soil pressure which can be reduced per meter is 2573.48N and 5146.96N respectively. Compared with the traditional mode, the invention considers the load shedding performance of the flexible filler EPS board, can reduce the wall back soil pressure and achieves the ideal load shedding effect.
When the construction process is applied, the construction process of the pile-plate U-shaped supporting and retaining load-reducing structure provided by the invention is completed according to the above embodiment and the load-reducing stress calculation method.
The above are only preferred embodiments of the present invention, but the protection and application of the present invention are not limited thereto, and if easily conceivable changes or substitutions are included in the protection of the present invention. Accordingly, the invention is to be controlled by the protection defined by the claims. The present invention is not described in detail, but is well known in the art.
Claims (6)
1. The utility model provides a pile plate U type fender structure of shedding which characterized in that: the pile plate U-shaped supporting and load reducing structure comprises an anti-slide pile (2) with a rectangular cross section, a load reducing block (1), a flexible filler EPS plate (3) and a rectangular steel plate (4); the number of the rectangular cross-section slide-resistant piles (2) is multiple; the load shedding block (1) is parallel to the rectangular-section slide-resistant pile (2) and is fixedly connected with the rectangular-section slide-resistant pile (2); the rectangular steel plates (4) are arranged on the two adjacent rectangular-section anti-slide piles (2) and form a firm supporting and load-reducing structure with a U-shaped cross section with the two adjacent rectangular-section anti-slide piles (2); the flexible filler EPS boards (3) are filled in the U-shaped retaining and load-reducing structure and are attached to the rectangular steel plates (4); the U-shaped supporting and load reducing structure extends from the stable soil body (I) to the unstable soil body (II) from top to bottom;
the width and thickness section of each rectangular section slide-resistant pile (2) is as follows, the dimension of the width and thickness section of each rectangular section slide-resistant pile (2) is as follows, the distance between the axes of two adjacent rectangular section slide-resistant piles (2) is as follows, the total length of each rectangular section slide-resistant pile (2) is as follows, the length of the rectangular section slide-resistant pile (2) above the ground is as follows, the length of the rectangular section slide-resistant pile (2) under the buried soil is as follows, and the units are m;
the thickness f of the load shedding block (1) is b/4, the width is a, and the height is e;
the height of the rectangular steel plate (4) is e, the width of the rectangular steel plate is c, and the thickness i of the rectangular steel plate is 5-20 mm;
the flexible filler EPS board (3) has the width of c-a, the height of e and the thickness of h1The value of (b) is b/20-b/5, and the value of the density rho is 10-30 kg/m3。
2. The pile plate U-shaped supporting and retaining load reduction structure according to claim 1, characterized in that: the thickness h of the flexible filler EPS board (3)1The value of (b) is b/10.
3. The utility model provides a construction technology of pile sheet U type fender structure that subtracts carries which characterized in that: the construction process comprises the following steps:
1) pouring after manual excavation treatment to obtain rectangular cross-section anti-slide piles (2), wherein the number of the rectangular cross-section anti-slide piles (2) is multiple; the width and thickness section of each rectangular section slide-resistant pile (2) is as follows, the dimension of the width and thickness section of each rectangular section slide-resistant pile (2) is as follows, the distance between the axes of two adjacent rectangular section slide-resistant piles (2) is as follows, the total length of each rectangular section slide-resistant pile (2) is as follows, the length of the rectangular section slide-resistant pile (2) above the ground is as follows, the length of the rectangular section slide-resistant pile (2) under the buried soil is as follows, and the units are m;
2) arranging a load reduction block (1) corresponding to the structure of the rectangular-section slide-resistant pile (2) on one side of the rectangular-section slide-resistant pile (2) facing the soil body, wherein the load reduction block (1) and the rectangular-section slide-resistant pile (2) form a whole;
3) two adjacent rectangular cross-section anti-slide piles (2) are taken as structural units, a rectangular steel plate (4) is installed on one side of the anti-slide piles (2) back to the soil body, and the rectangular steel plate (4) and the rectangular cross-section anti-slide piles (2) form a supporting and load-reducing structure with an integral cross section in a U shape;
4) placing flexible filler in the U-shaped supporting and load reducing structure prepared in the step 3); the flexible filler is attached to the rectangular steel plate (4);
5) carrying out stress analysis calculation on the U-shaped supporting and load reducing structure, specifically comprising the following steps:
5.1) carrying out load shedding stress analysis and calculation on the U-shaped supporting and retaining structure load shedding structural unit, taking a moment from a horizontal soil pressure C point of the back of the wall of the U-shaped supporting and retaining structure, and obtaining a moment from sigma Mc to 0
According to the theory of the pressure of the lang-gold soil,
wherein KpIs a passive earth pressure coefficient, KaThe active soil pressure coefficient, gamma is the weight of the soil body on the wall back and the cohesive force c of the soil0Ignore not counted as 0; x is the number of1The soil pressure is 0 point to the length from the ground of the foundation pit, x2The length from the soil pressure of 0 point to the pile bottom, P1For passive earth pressure, P2Active soil pressure;
5.2) only considering the part above the ground of the pile, simplifying the pile-plate and the load reduction block into a whole with one end fixed and the cantilever beam structure with one free end uniformly loaded, wherein the uniformly loaded size is the active soil pressure
5.3) considering the plastic stage of the flexible filler EPS board (3) as elastic change, so that the elastic modulus coefficients of the elastic stage and the plastic stage of the flexible filler EPS are respectively assumed to be E1、E2(ii) a The soil discharge pressure is respectively delta P1、ΔP2(ii) a Carrying out stress analysis on the horizontal deformation of the U-shaped supporting and retaining load-reducing structure, and according to the elastic mechanics knowledge, carrying out horizontal displacement difference delta caused by the rigidity difference between a flexible filler EPS board and a wall back soil body in the U-shaped supporting and retaining load-reducing structure1Calculated from the following equation:
wherein EsIs the deformation modulus coefficient, mu, of the wall back soil body1Is the Poisson's ratio of the wall back soil body, K1The horizontal displacement influence coefficient is related to the ratio of the height e to the width c of the steel plate; in the formula K1Taking values for the horizontal displacement influence coefficient;
5.4) compressive deformation δ produced by Flexible Filler EPS Panel2Obtained from the following equation:
wherein the values of the soil pressure Delta P for dumping are respectively Delta P1、ΔP2The thickness of the EPS board is h1The value of the elastic modulus coefficient E of the EPS board is divided into E1、E2Two cases;
5.5) summarizing the steps described above, by1＝δ2The equation of the upper formula (c) can be combined, (c) the soil unloading pressure of the EPS board can be obtained as follows:
the horizontal stress balance can be obtained, and the soil pressure after the load reduction of the EPS plate is considered as
4. The construction process of the pile plate U-shaped supporting and retaining load-reducing structure according to claim 3, characterized in that: the specific implementation manner of the step 2) is as follows: placing a load shedding block (1) on one side, facing a soil body, of the rectangular-section slide-resistant pile (2), and binding and fixing the load shedding block (1) and the rectangular-section slide-resistant pile (2) through steel wires; the thickness f of the load shedding block (1) is b/4, the width is a, and the height is e.
5. The construction process of the pile plate U-shaped supporting and retaining load-reducing structure according to claim 4, characterized in that: the specific implementation manner of the step 3) is as follows: the anti-slide pile with the rectangular cross section is characterized in that two adjacent anti-slide piles (2) with the rectangular cross section are used as structural units, a rectangular steel plate (4) is installed on one side, back to a soil body, of each anti-slide pile (2) with the rectangular cross section, the two adjacent anti-slide piles (2) with the rectangular cross section are firmly connected with the rectangular steel plate (4) through a fixed hinged support, a supporting and load reducing structure with a U-shaped cross section is formed, the height of the rectangular steel plate (4) is e, the width of the rectangular steel plate is c, and the thickness i of the rectangular steel plate is 5-20 mm.
6. The construction process of the pile plate U-shaped supporting and retaining load-reducing structure according to claim 5, characterized in that: the specific implementation manner of the step 4) is as follows: the flexible packing EPS boards (3) are vertically placed in the U-shaped supporting and load-reducing structure, the width of each flexible packing EPS board (3) is c-a, the height of each flexible packing EPS board is e, and the thickness of each flexible packing EPS board is h1The value of (b) is b/20-b/5, and the value of the density rho is 10-30 kg/m3。
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