Prestress splicing type buttress retaining wall and construction method thereof

Abstract

The invention discloses a prestressed splicing type buttress retaining wall and a construction method thereof, a cast-in-place reinforced concrete vertical buttress is utilized, a horizontal pre-tensioned prestressed prefabricated reinforced concrete hollow prefabricated slab beam and a prefabricated baffle are combined for splicing, a top cap is adopted for capping, and a tension stranded wire is adopted for connecting the top cap and a bottom plate, so that the prestressed splicing type buttress retaining wall is formed. And a brand-new counterfort type upright retaining wall is formed through combination. According to the condition of a supporting site, the brand-new counterfort type vertical retaining wall adopts the pre-tensioned prestressed prefabricated reinforced concrete prefabricated plate beams, and the post-tensioned prestressed tension stranded wires are arranged at main stressed parts in the cast-in-place reinforced concrete vertical counterforts, so that a brand-new retaining wall supporting structure is formed. The brand new retaining wall supporting structure solves the technical problems that an existing retaining wall supporting structure is long in length and high in construction difficulty, construction is troublesome, and construction efficiency is low.

Description

Technical Field

[0001] The present invention relates to the technical field of buttress retaining walls, and in particular to a prestressed spliced buttress retaining wall and a construction method thereof. Background Art

[0002] Retaining walls are a type of earth-retaining support structure frequently encountered in various fields of civil engineering construction, especially in the construction of roads or buildings in mountainous areas. As a broad term for retaining earth in civil engineering, retaining walls have developed into a variety of forms, the most common of which include upright gravity retaining walls made of masonry blocks, upright retaining walls with cast-in-place reinforced concrete buttresses, upright retaining walls with pile rows and cantilever structures, various upright retaining walls combined with anchor rods, various upright retaining walls combined with diagonal diagonal pile supports, and cast-in-place concrete beam facings with large slopes and wells. However, these retaining wall support structures are lengthy and difficult to construct, resulting in complex construction and low efficiency. This indirectly reflects the use of a large number of auxiliary construction equipment, which increases the cost of retaining wall construction. Therefore, it is of great significance to innovate and develop energy-saving and low-carbon retaining structures that are safe, reliable, simple to construct, highly effective, low-cost, and suitable for industrial production. Summary of the Invention

[0003] The purpose of the present invention is to provide a prestressed spliced buttress retaining wall and a construction method thereof, so as to solve the technical problems that the existing retaining wall support structure is long, difficult to construct, resulting in troublesome construction and low construction efficiency.

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

[0005] On the one hand, the present invention provides a prestressed spliced buttress retaining wall, comprising a base plate, a retaining base wall provided on the top surface of the base plate, a plurality of prefabricated slab beams and baffles provided on the top surface of the retaining base wall, buttresses provided between the prefabricated slab beams, baffles, base plate and retaining base wall, a top cap provided on the top surface of the buttress, and a tension strand connected between the top cap and the base plate.

[0006] A further technical solution is that a plurality of the prefabricated slab beams and baffles are staggered and stacked with each other, and a corbel is provided on the top of the baffle, wherein the top surface of the prefabricated slab beam or baffle is in contact with the top cap, and the prefabricated slab beams and baffles form a plurality of angles with the bottom plate by setting an inclination direction, and the angles form the buttresses into a plurality of inclination states, and the tension strands are adapted to be connected to a plurality of positions of the bottom plate according to the inclination states, and the ends of the tension strands can be connected to ground anchors;

[0007] A joint member is provided between the buttress and the prefabricated plate beam.

[0008] A further technical solution is that the buttress forms multiple inclined states including an upright state and an inverted upright state, and both the upright state and the inverted upright state establish an inclined relationship with the prefabricated slab beam, the baffle, the bottom plate, the retaining bottom wall and the tension strand.

[0009] A further technical solution is that the upright state includes the prefabricated slab beam or baffle being at right angles to the top surface of the base plate, the tension strand forming a first angle with the base plate, the prefabricated slab beam and the baffle being staggered and stacked in the vertical upward direction to form a vertical retaining wall, the buttresses in the vertical retaining wall are upright and tilted to the left, the side of the prefabricated slab beam or baffle is provided with an outward-moving baffle, the top surface of the retaining bottom wall is provided with a limiting groove formed with the prefabricated slab beam or baffle, and the bottom end of the outward-moving baffle extends into the limiting groove to fixedly contact the side of the baffle of the prefabricated slab beam.

[0010] A further technical solution is that the anti-upright state includes an inverted anti-upright state and a double anti-upright state, and the anti-upright state and the double anti-upright state include the prefabricated slab beam, the baffle and the bottom plate, the retaining bottom wall and the tension strand establishing an inclined relationship, the prefabricated slab beam and the baffle are staggered and stacked in a trapezoidal shape, the prefabricated slab beam and the baffle are at an acute angle to the bottom plate, and the tension strand forms a second angle with the bottom plate.

[0011] A further technical solution is that the inverted upright state includes the tension strands and the bottom plate forming a third angle, and the double inverted upright state includes the tension strands and the bottom plate forming a fourth angle.

[0012] A further technical solution is that the prefabricated slab beam includes a strip block, the strip block has a built-in empty slot, the inner side wall of the empty slot is connected to multiple cross beams, and is provided with right-angled edges, the right-angled edges and the cross beams are adapted to connect to the end of the baffle, and an opening is provided on the side of the strip block to communicate with the empty slot, and the opening is connected to the corbel.

[0013] A further technical solution is that the prefabricated slab beam further includes a right-angled outer wall on the side of the strip block.

[0014] A further technical solution is that a pedestal is provided at the top end of the tension strand, and the pedestal is embeddedly connected to the top cap and the prefabricated slab beam or baffle.

[0015] In another aspect, the present invention provides a method for constructing a prestressed spliced buttress retaining wall, comprising the following steps:

[0016] Based on the predetermined address, building a base plate and buttresses, as well as a retaining base wall on the side of the base plate;

[0017] Precast slab beams and baffles are stacked alternately on the top surface of the retaining wall until a preset height is reached, with the precast slab beams or baffles as the top;

[0018] The top surfaces of the prefabricated plate beams and the baffles form a top cap, and the bottom surface of the top cap is used to cover the top of the buttress, prefabricated plate beam or baffle;

[0019] Embed a pedestal in the gap between the top cap and the prefabricated slab beam or baffle;

[0020] The base is used to pull the tension strands, and the bottom ends of the tension strands are connected to multiple positions on the top surface of the bottom plate, or to the ground corresponding to the hollow space of the bottom plate;

[0021] A ground anchor is set on the ground corresponding to the bottom plate or the hollow space of the bottom plate and connected to the bottom end of the tension strand;

[0022] The prefabricated slab beam, retaining bottom wall, retaining plate, buttress and tension strands are used to construct a spliced retaining wall.

[0023] The beneficial effects of the present invention are:

[0024] The present invention utilizes cast-in-place reinforced concrete vertical buttresses, combined with horizontal pre-tensioned prestressed precast reinforced concrete hollow precast slab beams and precast baffles, and is capped with a top cap, and tension strands are used to connect the top cap and the bottom plate, forming a new buttress-type vertical retaining wall. According to the support site conditions, this new buttress-type vertical retaining wall adopts pre-tensioned prestressed precast reinforced concrete precast slab beams, and post-tensioned prestressed tension strands are set at the main stress-bearing parts of the cast-in-place reinforced concrete vertical buttresses, forming a new retaining wall support structure. This new retaining support structure solves the technical problems of the existing retaining wall support structure, which is long in length, difficult to construct, and leads to troublesome construction and low construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of a prestressed spliced buttress retaining wall in an upright state according to the present invention;

[0026] Figure 2 This is a schematic diagram of a prestressed spliced buttress retaining wall in an anti-erect state according to the present invention;

[0027] Figure 3 This is a schematic diagram of a prestressed spliced buttress retaining wall of the present invention in an inverted upright state;

[0028] Figure 4 This is a schematic diagram of a prestressed spliced buttress retaining wall in a double reverse upright state according to the present invention;

[0029] Figure 5 This is a schematic cross-sectional view of a prestressed spliced buttress retaining wall of the present invention in an upright state;

[0030] Figure 6 It is a first overall top view schematic diagram of a prefabricated slab beam in a prestressed spliced buttress retaining wall of the present invention;

[0031] Figure 7 This is a first overall structural diagram of a prefabricated slab beam in a prestressed spliced buttress retaining wall according to the present invention;

[0032] Figure 8 This is a schematic diagram of the connection of baffles in a prestressed spliced buttress retaining wall of the present invention;

[0033] Figure 9 This is a schematic diagram of the connection between buttresses, baffles, prefabricated slab beams and horns in a prestressed spliced buttress retaining wall of the present invention;

[0034] Figure 10 This is a schematic diagram of the connection between buttresses and prefabricated slab beams in a prestressed spliced buttress retaining wall of the present invention;

[0035] Figure 11 This is a schematic diagram of welding prefabricated slab beams in a prestressed spliced buttress retaining wall according to the present invention;

[0036] Figure 12 Schematic diagram of a first telescopic plug-in unit in a prestressed spliced buttress retaining wall according to the present invention;

[0037] Figure 13 Schematic diagram of a second telescopic plug-in unit in a prestressed spliced buttress retaining wall according to the present invention;

[0038] Figure 14 A schematic diagram of a first telescopic plug-in arrangement between a precast slab beam and a buttress in a prestressed spliced buttress retaining wall;

[0039] Figure 15 This is a schematic diagram of a second telescopic plug-in unit provided between a prefabricated plate beam and a buttress in a prestressed spliced buttress retaining wall according to the present invention;

[0040] Figure 16 It is a schematic diagram of an inverted vertical section of a prestressed spliced buttress retaining wall of the present invention;

[0041] Figure 17 It is a schematic diagram of the reverse vertical section of a prestressed spliced buttress retaining wall of the present invention;

[0042] Figure 18 This is a second overall top view schematic diagram of a prefabricated slab beam in a prestressed spliced buttress retaining wall according to the present invention;

[0043] Figure 19 This is a second overall structural diagram of a prefabricated slab beam in a prestressed spliced buttress retaining wall according to the present invention;

[0044] Figure 20 This is a diagram of a prefabricated slab beam and a baffle in a prestressed spliced buttress retaining wall of the present invention in a first compression state;

[0045] Figure 21 This is a diagram of the second compression state of the precast slab beam and the baffle in the prestressed spliced buttress retaining wall of the present invention;

[0046] Figure 22 This is a step diagram of a construction method for a prestressed spliced buttress retaining wall according to the present invention.

[0047] In the figure, 1. base plate; 2. buttress; 3. retaining wall; 4. precast slab beam; 5. baffle; 6. tension strand; 7. ground anchor; 8. corbel; 9. outward baffle; 10. top cap; 11. pedestal. DETAILED DESCRIPTION

[0048] 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.

[0049] See also Figures 1 to 21 On the one hand, the present invention provides a prestressed spliced buttress retaining wall, including a base plate 1, a retaining base wall 3 is provided on the top surface of the base plate 1, a plurality of prefabricated slab beams 4 and baffles are provided on the top surface of the retaining base wall 3, buttresses 2 are provided between the prefabricated slab beams 4, baffles, base plate 1 and retaining base wall 3, a top cap 10 is provided on the top surface of the buttress 2, and a tension strand 6 is connected between the top cap 10 and the base plate 1.

[0050] It should be noted that the tension strand 6 is made of high-strength steel.

[0051] In the embodiment of the present invention, Figures 1 to 4 As shown, a method for constructing both upright and inverted cast-in-place post-tensioned prestressed buttress retaining walls has been developed to address construction site conditions. Both types of buttress retaining walls consist of a cast-in-place base slab 1, cast-in-place buttress 2, cast-in-place retaining base wall 3, pre-tensioned precast reinforced concrete slab beams 4, pre-tensioned precast reinforced concrete retaining panels, post-tensioned high-strength steel strands 6 in the tension zone of the buttress 2, and a spliced top cap 10.

[0052] Specifically, the present invention utilizes cast-in-place reinforced concrete vertical buttresses 2, combined with horizontal pre-tensioned prestressed precast reinforced concrete hollow precast slab beams 4 and precast baffles 5, and capped with a top cap 10, and uses tension strands 6 to connect the top cap 10 and the bottom plate 1, forming a new buttress 2 type vertical retaining wall. According to the support site conditions, this new buttress 2 type vertical retaining wall adopts pre-tensioned prestressed precast reinforced concrete precast slab beams 44, and post-tensioned prestressed tension strands 6 are set at the main stress-bearing parts of the cast-in-place reinforced concrete vertical buttresses 2, forming a new retaining wall support structure. This new retaining support structure solves the technical problems of the existing retaining wall support structure, which is long in length, difficult to construct, and leads to troublesome construction and low construction efficiency.

[0053] Preferably, multiple prefabricated slab beams 4 and baffles are staggered and stacked with each other, and a corbel 8 is provided on the top of the baffle, wherein the top surface of the prefabricated slab beam 4 or the baffle is in contact with the top cap 10, and the prefabricated slab beam 4 and the baffle form multiple angles with the bottom plate 1 by setting the inclination direction. The angles form the buttress 2 into multiple inclination states, and the tension strand 6 is adapted and connected to multiple positions of the bottom plate 1 according to the inclination state, and the end of the tension strand 6 can be connected to the ground anchor 7; a joint is provided between the buttress 2 and the prefabricated slab beam 4.

[0054] It should be noted that the corbel 8 refers to a beam support or a support arch, which is an important structural component, mainly used to support the connection between the cantilever beam and the hanging beam and transfer the load.

[0055] In an embodiment of the present invention, the retaining bottom wall 3 forms a right angle with the bottom plate 1, and the retaining bottom wall 3 is mainly used to block the lateral pressure of water and soil at the bottom. First, the baffles are connected to each other, and then the precast slab beam 4 is connected to the top of the baffle 5, and they are stacked in sequence to form a retaining wall. Corbels 8 are set on the precast slab beam 4 and the baffle to support the stability of the precast slab beam 4 and the baffle. As shown in the figure, the protruding corbels 8 and the ends of the precast slab beam 4 prevent the standardized baffle from being laid close to the buttress 2, so two side plates with notches at the corners are set for each buttress 2 bays as shown in the figure. The distribution of the precast baffles laid for every two buttresses 2 bays is shown in the figure. The main reinforcement longitudinally arranged in the cross section of the baffle 5 is low-carbon cold-drawn steel bar, which withstands the lateral water and soil pressure transmitted from the backfill soil behind the baffle 5.

[0056] In addition, the prefabricated slab beams 4 and baffles can be built to form different angles with the bottom plate 1 according to different sites, and the tension strands 6 are configured to connect the top cap 10 and the bottom plate 1 to improve the stability of the retaining wall.

[0057] Preferably, the buttress 2 forms multiple inclined states including an upright state and an inverted upright state, and both the upright state and the inverted upright state establish an inclined relationship with the prefabricated slab beam 4, the baffle and the bottom plate 1, the retaining bottom wall 3 and the tension strand 6.

[0058] In this embodiment of the invention, the retaining wall is divided into two types, upright and inverted, based on the angle formed by the precast slab beam 4 and the retaining plate. Depending on the site, the retaining wall is constructed in either upright or inverted configuration. The tension strands 6 establish an inclined relationship, which helps improve the stability of the retaining wall in different configurations. Upright retaining walls are typically used in relatively narrow sites.

[0059] Preferably, the upright state includes the precast slab beam 4 or baffle being at right angles to the top surface of the base plate 1, the tension strand 6 forming a first angle with the base plate 1, the precast slab beam 4 and the baffle being stacked and constructed in an interlaced manner in the vertical upward direction to form a vertical retaining wall, the buttress 2 in the vertical retaining wall being upright and tilted to the left, an outward baffle 9 being provided on the side of the precast slab beam 4 or baffle, a limiting groove being formed with the precast slab beam 4 or baffle on the top surface of the retaining bottom wall 3, and the bottom end of the outward baffle 9 extending into the limiting groove to fixedly contact the side of the precast slab beam 4 baffle.

[0060] It should be noted that the first angle is Figure 1 As shown, the tension strands 6 form a first angle with the bottom plate 1, forming a retaining wall in a straight upright state. The outward moving baffle 9 is used to limit the outward movement of the precast slab beam 4 and the baffle, and can block the lateral pressure of the water body.

[0061] In the embodiment of the present invention, the overall structure of the retaining wall and its cross section are shown in FIG. Figure 1 and Figure 5 , where the total height H of the retaining wall, the bottom width B, the center distance L of buttress 2, the total height h of buttress 2, the bottom width b1 of buttress 2, the top width b2 of buttress 2, and the thickness t1 of buttress 2 are determined by the height of the slope protection and the soil pressure. Based on the construction height of the retaining wall, the upper portion of the height is divided into several standardized equal sections h2, while the lower cast-in-place retaining base wall 3 has a height h1. h1 represents the vertical spacing of the pre-tensioned, prestressed, reinforced concrete precast slab beams 4. The precast slab beams 4 have a width b3 and a thickness t4. The marked length of the precast retaining plate (the actual length includes the lower embedding dimension) is h2, and the thickness is t5. Regardless of the retaining wall height H and the total height h of buttress 2, adjusting the height h1 of the cast-in-place retaining base wall 3 can keep the standardized equal sections h2 unchanged. Simply increasing or decreasing the number n of precast slab beams 44 allows for uniformity and standardization of the precast slab beams 44 and retaining plates 5.

[0062] The cast-in-place buttress 2 of the upright spliced buttress 2 retaining wall is constructed. The cast-in-place base slab 1 is cast in a conventional formwork, followed by the buttress 2 and retaining base wall. After the concrete has cured to strength, the first phase of soil backfill can begin. The width B of the base slab 1 and the bottom width b1 of the buttress 2 are determined by the height of the retaining wall and the lateral earth pressure. The top width b2 of the buttress 2, or the width b2 of the cast-in-place top cap 10, ranges from 500 to 1000 mm. The total height H of the buttress 2 is determined by the height of the slope protection. For larger heights, it is usually cast in sections. The thickness t1 of the buttress 2 is determined by the lateral pressure on the retaining wall and is between 200 and 600 mm. The thickness can also be reduced stepwise along the height to create a stepped cross-section. The center-to-center distance L of the buttress 2 is determined by the lateral pressure on the retaining wall and is between 3 and 6 meters. The height h1 of the retaining base wall ranges from 500 to 1500 mm, and the wall thickness t2 ranges from 300 to 600 mm. The cast-in-situ buttress 2 is a cantilever bending main component, and a post-tensioned prestressed tension strand 6 (such as Figure 5 shown).

[0063] Prestressed precast reinforced concrete lattice slab beams and retaining plates. Precast reinforced concrete lattice slab beams and retaining plates are usually manufactured in the factory using the prestressed long-line method. The main reinforcement arranged longitudinally in the cross section is low-carbon cold-drawn steel bar, which withstands the lateral water and soil pressure transmitted from the retaining plates. The finished product of the precast slab beam 4 used for the vertical spliced buttress 2 retaining wall can be found in Figure 6 、 7 The width b3 of the plate beam is 400-800mm, the thickness t4 is 200-500mm, and the marking length L is the center distance between the two buttresses 2. The width b4 of the standardized baffle is 500-1500mm, the thickness t5 is 50-150mm, and the marking length h2. One side of the baffle has a groove (concave depth δ1) and the other side is convex (convex length δ2<δ1), so that the adjacent baffles 5 can be tightly engaged (such as Figure 8 As shown). Due to the protruding corbel 8 and the end of the prefabricated plate beam 4, the standardized baffle is prevented from being laid close to the buttress 2, so two side plates with notches at the corners are provided in each buttress 2 bay (as shown). Figure 9 For the distribution of prefabricated baffles for every two buttresses and two bays, refer to Figure 9 .

[0064] Layered splicing of prestressed precast slab beams 4 and baffles. It can be poured to the top in one go (when the retaining wall is not high) or layered (when the retaining wall is high), including the protruding corbels 8 and the baffles 9 to prevent outward movement. The cast-in-place buttresses 2 can be poured layer by layer or in several layers according to the vertical distribution spacing h2 of the lattice slab beams. Regardless of how the buttresses 2 are cast, the precast slab beams 4 and baffles are always spliced layer by layer from bottom to top, and the soil layer is immediately backfilled after each layer is spliced, and the retaining wall construction is completed layer by layer (such as Figure 5 shown).

[0065] The connection method of precast plate beam 4 and cast-in-place buttress 2. The connection method of precast plate beam 4 and cast-in-place buttress 2 can be various. For example, precast plate beam 4 is embedded with iron parts on the protruding corbel 8 of cast-in-place buttress 2 and precast plate beam 4, and the precast plate beam 4 is fixedly connected with cast-in-place buttress 2 by on-site welding of the embedded iron parts (such as Figure 10 As shown); when the precast plate beam 4 is set aside, the buttress 2 is cast upwards. The buttress 2 does not need to be embedded in iron parts. The precast plate beams 4 on both sides are directly welded with steel bars (as shown). Figure 11 When the retaining wall is large in the longitudinal direction and needs to be equipped with expansion joints affected by temperature, the precast slab beam 4 and the cast-in-place buttress 2 are fixedly connected by inserting two pre-buried sleeves with retractable steel rods (red lines) (as shown). Figure 12 As shown) or embedded steel rods (red line) inserted into the reserved holes can be retracted and fixed (as shown) Figure 13 As shown), this simple method replaces the traditional method of casting double rows of buttresses with two expansion joints.

[0066] Method for constructing the top cap 10 of the buttress 2. First, cast the buttress 2 to the top, pre-embed the steel plate pedestal 11 for tensioning the tension strands 6 configured for the buttress 2, lay the precast slab beams 4 and tension the tension strands 6 to apply prestress, then superimpose and cast the top cap 10 of the buttress 2, and fill the empty grooves of the precast slab beams 4 with concrete (which can be used as ground ditches). In addition, see Figure 14 and Figure 15 In the figure, the expansion joint is embedded with grease and laid with flexible roll material (red line), which can be used for fixed connection and retractable top-pressing methods respectively.

[0067] Preferably, the anti-upright state includes an inverted anti-upright state and a double anti-upright state. The anti-upright state and the double anti-upright state include prefabricated slab beams 4, baffles and base plate 1, retaining bottom wall 3 and tension strands 6 establishing an inclined relationship. The prefabricated slab beams 4 and baffles are staggered and stacked in a trapezoidal shape. The prefabricated slab beams 4 and baffles are at an acute angle to the base plate 1, and the tension strands 6 form a second angle with the base plate 1.

[0068] It should be noted that the second angle is the same as the first angle.

[0069] In the embodiment of the present invention, the anti-erect state is as follows Figure 2 As shown, the difference between the anti-upright state and the upright state is that its surface is stepped, and shrubs can be planted in the empty slots of each step beam to produce a good landscape effect.

[0070] The method for constructing the bottom retaining plate 5 of the reverse vertical spliced buttress 2 retaining wall. The stepless method of directly erecting the retaining plate on the cast-in-place retaining bottom wall 3 (such as Figure 15 as shown) or the step method of laying stepped slab beams (as shown Figure 17 shown).

[0071] Method for constructing cast-in-place buttress 2 of reverse vertical splicing retaining wall. The cast-in-place buttress 2 of reverse vertical retaining wall should be easy to splice precast slab beam 4 and retaining plate, and the connection with buttress 2 should be able to withstand the lateral pressure from precast slab beam 4. The specific method is to cast a pedestal 11 (such as Figure 20 、 21 As shown) it can easily place the plate beam and prevent lateral horizontal thrust.

[0072] Preferably, the inverted upright state includes the tension strand 6 and the base plate 1 forming a third angle, and the double inverted upright state includes the tension strand 6 and the base plate 1 forming a fourth angle.

[0073] It should be noted that the third angle is Figure 3 As shown, the fourth angle is Figure 4 As shown, the tension strand 6 forms an acute angle with the left side of the base plate 1 .

[0074] In the implementation of the present invention, the construction method of the inverted upright and double inverted upright cast-in-place post-tensioned prestressed spliced buttress 2 retaining wall is basically the same as the inverted upright method, with only the appearance of the cast buttress 2 being different.

[0075] Preferably, the prefabricated slab beam 4 includes a strip block with a built-in empty slot. The inner side wall of the empty slot is connected to multiple cross beams and is provided with right-angled edges. The right-angled edges and the cross beams are adapted to connect to the end of the baffle. An opening is provided on the side of the strip block to communicate with the empty slot, and the opening is connected to the corbel 8.

[0076] In the embodiment of the present invention, Figure 7 As shown, the slots provided in the prefabricated plate beams 4 can be used to plant shrubs, while the right-angled sides and cross beams are adapted to be fixedly connected to the baffles 5, thereby improving the stability of the retaining wall. It is also applicable to retaining walls in an upright state.

[0077] Preferably, the prefabricated slab beam 4 further includes a strip block with a right-angled outer wall on the side surface.

[0078] In the embodiment of the present invention, Figure 19 As shown, the prefabricated plate beam 4 can also adopt the shape of a right-angled outer wall, and the empty groove can be used to plant shrubs. At the same time, its right-angled side and the cross beam are adapted to be fixedly connected to the baffle 5 to improve the stability of the retaining wall. The prefabricated plate beam 4 and the retaining board of the anti-vertical spliced buttress 2 retaining wall are constructed in the same way as the upright retaining wall, with only the cross section changed (such as Figure 18 、 19 The baffle 5 is constructed in the same manner as the upright retaining wall.

[0079] Preferably, a pedestal 11 is provided at the top end of the tension strand 6, and the pedestal 11 is embeddedly connected to the top cap 10 and the prefabricated plate beam 4 or the baffle.

[0080] In the embodiment of the present invention, the construction sequence of the reverse vertical spliced buttress 2 retaining wall is basically the same as that of the vertical one. First, the buttress 2 and the pedestal 11 for placing the prefabricated slab beam 4 are cast layer by layer or several layers, and then the prefabricated slab beam 4 and the retaining plate (such as the retaining plate) are backfilled and spliced layer by layer from bottom to top. Figure 14 As shown), the base 11 is embedded in the top cap 10, which facilitates the subsequent connection of the tension strand 6.

[0081] join Figures 1 to 22 Another aspect of the present invention provides a method for constructing a prestressed spliced buttress retaining wall, comprising the following steps:

[0082] Step S101: Based on a predetermined address, build a base plate 1 and buttresses 2, as well as a retaining wall 3 on the side of the base plate 1;

[0083] Step S102: stacking precast slab beams 4 and baffles alternately on the top surface of the retaining bottom wall 3 until a preset height is reached, with the precast slab beams 4 or baffles as the top;

[0084] Step S103: A top cap 10 is built on the top surface of the precast plate beam 4 and the baffle. The bottom surface of the top cap 10 is used to cover the top of the buttress 2, the precast plate beam 4 or the baffle.

[0085] Step S104: embed the pedestal 11 into the gap between the top cap 10 and the prefabricated slab beam 4 or the baffle;

[0086] Step S105: Use the pedestal 11 to pull the tension strand 6, and connect the bottom ends of the tension strand 6 to multiple locations on the top surface of the base plate 1, or to the ground corresponding to the hollow space of the base plate 1;

[0087] Step S106: Setting a ground anchor 7 on the bottom plate 1 or on the ground corresponding to the hollow space in the bottom plate 1 and connecting it to the bottom end of the tension strand 6;

[0088] Step S107 , using the prefabricated slab beams 4 , the retaining bottom wall 3 , the baffles, the buttresses 2 and the tension strands 6 to construct a spliced retaining wall.

[0089] In the embodiment of the present invention, the function of the retaining wall is to resist the soil and water pressure behind the wall to ensure the safety of buildings and municipal roads in the area in front of the wall. The main lateral force resistant component of the retaining wall with positive and negative upright buttresses 2 is still the cast-in-place buttress 2. As long as its lateral resistance is improved, the lateral force resistance of the entire retaining wall is improved. The enhanced reinforced concrete lateral force resistant cast-in-place buttress 2 is made by setting post-tensioned prestressed high-strength steel strands in the main tensile resistance area, and setting ground anchors 7 at the bottom of the buttress 2 when necessary. The use of relatively cheap materials and measures greatly improves the retaining wall's anti-overturning and anti-sliding capabilities, which are the components of the retaining wall's lateral resistance.

[0090] Specifically, high-strength tensile steel strands are buried in the tension zone of the buttress 2 to replace traditional tensile steel bars. The number of strands is determined by the tensile strength. The bottom of the strands is anchored to the bottom of the cast-in-place base plate 1 and the buttress 2 (e.g. Figure 5 、 16 (As shown), a steel strand with a hardened coating or a sleeved tension strand 6 is used. The tension strand 6 passes through a steel pedestal 11 embedded during the casting of the retaining wall's top slab. Once the top of the cast-in-place buttress 2 is complete and the retaining wall is approximately halfway filled, it is tensioned and locked to apply prestress according to regulations. When the retaining wall is tall and the lateral forces are high, anchor rods are driven into the base of the tension zone of the buttress 2, anchored to the cast-in-place base slab 1 and the bottom of the buttress 2. This converts the lateral pressure of the soil on the retaining wall into tension on the high-strength steel strands 7. This significantly improves the overall lateral resistance of the retaining wall with a small number of tensile members.

[0091] 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 prestressed spliced buttress retaining wall, characterized in that: It includes a bottom plate, a retaining bottom wall is provided on the top surface of the bottom plate, a plurality of prefabricated slab beams and baffles are provided on the top surface of the retaining bottom wall, buttresses are provided between the prefabricated slab beams, baffles, bottom plate and retaining bottom wall, a top cap is provided on the top surface of the buttress, and a tension strand is connected between the top cap and the bottom plate.

2. A prestressed spliced buttress retaining wall according to claim 1, characterized in that: Multiple prefabricated slab beams and baffles are staggered and stacked with each other, and a corbel is provided on the top of the baffle, wherein the top surface of the prefabricated slab beam or baffle is in contact with the top cap, and the prefabricated slab beams and baffles form multiple angles with the bottom plate by setting an inclined direction, and the angles form the buttresses into multiple inclined states, and the tension strands are adapted to be connected to multiple positions of the bottom plate according to the inclined states, and the ends of the tension strands can be connected to ground anchors; A joint member is provided between the buttress and the prefabricated plate beam.

3. The prestressed spliced buttress retaining wall according to claim 2, characterized in that: The buttress forms multiple inclined states including a positive upright state and a reverse upright state, and both the positive upright state and the reverse upright state establish an inclined relationship with the prefabricated slab beam, the baffle, the bottom plate, the retaining bottom wall and the tension strand.

4. The prestressed spliced buttress retaining wall according to claim 3, characterized in that: The upright state includes the prefabricated slab beam or baffle being at right angles to the top surface of the base plate, the tension strand forming a first angle with the base plate, the prefabricated slab beam and the baffle being staggered and stacked in the vertical upward direction to form a vertical retaining wall, the buttresses in the vertical retaining wall being upright and tilted to the left, the side of the prefabricated slab beam or baffle being provided with an outward-moving baffle, the top surface of the retaining bottom wall being provided with a limiting groove formed with the prefabricated slab beam or baffle, the bottom end of the outward-moving baffle extending into the limiting groove to fixedly contact the side of the baffle of the prefabricated slab beam.

5. The prestressed spliced buttress retaining wall according to claim 3, characterized in that: The anti-upright state includes an inverted anti-upright state and a double anti-upright state. The anti-upright state and the double anti-upright state include the prefabricated slab beam, the baffle and the bottom plate, the retaining bottom wall and the tension strand establishing an inclined relationship. The prefabricated slab beam and the baffle are staggered and stacked in a trapezoidal shape. The prefabricated slab beam and the baffle form an acute angle with the bottom plate, and the tension strand forms a second angle with the bottom plate.

6. The prestressed spliced buttress retaining wall according to claim 5, characterized in that: The inverted upright state includes the tension strands and the bottom plate forming a third angle, and the double inverted upright state includes the tension strands and the bottom plate forming a fourth angle.

7. The prestressed spliced buttress retaining wall according to claim 2, characterized in that: The prefabricated slab beam includes a strip block with a built-in empty slot. The inner side wall of the empty slot is connected to multiple beams and is provided with a right-angled edge. The right-angled edge and the beam are adapted to connect to the end of the baffle. An opening is provided on the side of the strip block to communicate with the empty slot, and the opening is connected to the corbel.

8. The prestressed spliced buttress retaining wall according to claim 7, characterized in that: The prefabricated slab beam also includes a right-angled outer wall on the side of the strip block.

9. The prestressed spliced buttress retaining wall according to claim 1, characterized in that: A pedestal is provided at the top end of the tension strand, and the pedestal is embeddedly connected to the top cap and the prefabricated plate beam or baffle.

10. A method for constructing a prestressed spliced buttress retaining wall according to any one of claims 1 to 9, characterized in that: The following steps are involved: Based on the predetermined address, building a base plate and buttresses, as well as a retaining base wall on the side of the base plate; Precast slab beams and baffles are stacked alternately on the top surface of the retaining wall until a preset height is reached, with the precast slab beams or baffles as the top; The top surfaces of the prefabricated plate beams and the baffles form a top cap, and the bottom surface of the top cap is used to cover the top of the buttress, prefabricated plate beam or baffle; Embed a pedestal in the gap between the top cap and the prefabricated slab beam or baffle; The base is used to pull the tension strands, and the bottom ends of the tension strands are connected to multiple positions on the top surface of the bottom plate, or to the ground corresponding to the hollow space of the bottom plate; A ground anchor is set on the ground corresponding to the bottom plate or the hollow space of the bottom plate and connected to the bottom end of the tension strand; The prefabricated slab beam, retaining bottom wall, retaining plate, buttress and tension strands are used to construct a spliced retaining wall.

Images