A retaining wall reinforcement structure for localized collapse and a construction method thereof

Abstract

The application discloses a kind of retaining wall reinforcing structure for local collapse and its construction method, belong to slope protection or retaining wall supporting technical field;Retaining wall reinforcing structure includes the retaining wall structure of being composed of undamaged retaining wall and new masonry retaining wall built on undamaged retaining wall, and the reinforcing structure of being composed of artificial hole digging pile in the soil body of being destroyed after retaining wall, inter-pile connection beam and soil body inter-grouting pile;Artificial hole digging pile and inter-pile connection beam jointly constitute space pile-contact beam structure, and soil body inter-grouting pile and pile-contact beam structure form more stable structure system;Undamaged retaining wall and new masonry retaining wall are fixedly connected by planting bar and interface agent.The connecting structure of new and old retaining wall and the space pile-contact beam structure formed by artificial hole digging pile and inter-pile connection beam can fully utilize undamaged retaining wall to reinforcing structure, compared with conventional reinforcement method, the stability of reinforcing structure is improved, and the process of reinforcement construction is also simplified.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of slope protection or retaining wall support, and particularly relates to a retaining wall reinforcing structure for local collapse and a construction method thereof. BACKGROUND

[0002] With the rapid development of infrastructure projects, retaining walls are widely used in slope reinforcement construction. However, the original retaining walls around the project have cracking, damage and collapse, which is particularly prominent. If not handled or handled improperly, it will cause significant loss of life and property. With the promotion of the reconstruction of old projects, how to reinforce and handle the damaged and collapsed retaining walls has always been a difficult problem for engineering practitioners.

[0003] The traditional retaining wall reinforcing method considers the retaining wall as a whole, and adopts unified reinforcing measures and construction methods, but there are still the following problems: 1) using steel pipe pile + prestressed anchor cable, or rib plate type combined anchor rod for reinforcement, but the length of the prestressed anchor cable or anchor rod is relatively long, and the effective anchoring section is difficult to determine, which makes it difficult to ensure the reinforcing quality; 2) using stone retaining wall, although the stone retaining wall material is easy to obtain and the construction method is simple, but the frictional resistance between the stone retaining wall and the original rock is small, the shear performance is low, and the quality cannot be guaranteed; 3) adding support wall reinforcement can handle the problems of slight inclination and local bulging of the retaining wall body, but the effect is not good for handling the serious damage of the retaining wall body, and the reinforcing quality cannot be guaranteed. The above methods are all reinforcing measures for the overall structure of the retaining wall, and for the partially collapsed and severely damaged retaining wall, the reinforcing measures are conservative and the economy is poor.

[0004] Therefore, it is urgent to design a retaining wall reinforcing structure and construction method for local collapse, which can save reinforcing materials and reduce reinforcing costs on the basis of meeting the stability of reinforcement. SUMMARY

[0005] The purpose of the present application is to solve the problems in the prior art and provide a retaining wall reinforcing structure and construction method for local collapse, which adopts a connecting structure of new and old retaining walls, and a space pile-contact beam structure formed by a man-made hole pile and a contact beam between piles, so as to fully utilize the undamaged retaining wall in the reinforcing structure, improve the stability of the reinforcing structure compared with conventional reinforcing methods, and simplify the reinforcing construction process.

[0006] To achieve the above object, the application adopts the following technical scheme: A retaining wall reinforcing structure for local collapse, which comprises a retaining wall structure composed of an undamaged retaining wall and a newly built retaining wall built on the undamaged retaining wall, and a reinforcing structure composed of artificial hole-digging piles arranged in the damaged soil behind the retaining wall, inter-pile connecting beams and soil inter-pile grouting piles.

[0007] The artificial hole-digging piles are vertically and equidistantly arranged in two rows in the damaged soil behind the retaining wall, and the positions of the two rows of artificial hole-digging piles correspond to staggered distribution; the multiple artificial hole-digging piles in the same row are connected through the horizontally arranged inter-pile connecting beams, and one artificial hole-digging pile in the same row and the two artificial hole-digging piles in the opposite row and adjacent positions are connected through the horizontally arranged inter-pile connecting beams, and the artificial hole-digging piles and the inter-pile connecting beams jointly constitute a space pile-connecting beam structure; the soil inter-pile grouting piles are arranged in multiple rows parallel to the artificial hole-digging piles, and the multiple rows of soil inter-pile grouting piles and the two rows of artificial hole-digging piles are arranged in a horizontal plane.

[0008] The undamaged retaining wall and the newly built retaining wall are arranged as a horizontal contact surface, the horizontal contact surface is provided with an interface agent, and vertical planting rods are arranged at the horizontal contact surface, and the undamaged retaining wall and the newly built retaining wall are fixedly connected through the planting rods and the interface agent.

[0009] The row spacing of the artificial hole-digging piles is 2400mm, and the distance between adjacent piles is 2000mm; the lower end of the artificial hole-digging pile is arranged in the bearing layer of the soil body below the undamaged retaining wall.

[0010] The setting height of the inter-pile connecting beam is 500mm below the artificial hole-digging pile, and the cross-sectional size of the inter-pile connecting beam is 200mm*250mm.

[0011] The row spacing and the distance between adjacent piles of the soil inter-pile grouting pile are both 1000mm.

[0012] The diameter of the planting rod is 25mm, and the total length of the planting rod is 1100mm.

[0013] A construction method of a retaining wall reinforcing structure for local collapse, comprising the following steps:

[0014] S1, construction of a damaged soil body reinforcing structure behind the retaining wall:

[0015] Construction of the artificial hole-digging pile: after leveling the site of the damaged soil body behind the retaining wall, the pile position of the artificial hole-digging pile is determined by setting a positioning reference pile outside the pile position, the wall formwork is installed and the wall concrete is poured, and after the concrete forms strength, the pile hole is manually excavated, the steel reinforcement cage processed is hoisted into the pile hole, and the construction is completed after pouring the concrete.

[0016] Construction of the contact beam between piles: according to the position of the manual hole digging pile, the formwork groove of the contact beam between piles is excavated, the contact beam formwork is installed, the beam reinforcement is bound in the formwork, and the construction is completed by pouring concrete;

[0017] Construction of the soil interlayer grouting pile: the drilling position of the soil interlayer grouting pile is determined according to the position of the manual hole digging pile, a groove and a sump are excavated along the drilling position, a grouting pipe is pressed into the soil layer, a closed mud is injected into the grouting pipe from the drill rod, the grouting pipe is lifted from bottom to top or from top to bottom after the closed mud is solidified to form the soil interlayer grouting pile;

[0018] S2, remove the local collapse retaining wall:

[0019] The road on the lower side of the undamaged retaining wall is repaired, a water interception ditch is arranged on the side of the road to drain the underground water after the collapsed part of the retaining wall is removed, the retaining wall is supported by using an I-steel support, and is removed in layers from top to bottom, and the height of each layer is 1m;

[0020] S3, set the connection measures of the new and old retaining walls:

[0021] The interface of the undamaged retaining wall is chiseled and washed clean, the drilling position is determined by grid hanging line at the position of the dowel bar, the dowel bar hole is drilled by using an impact drill, and the steel bar is planted in the undamaged retaining wall by using a dowel bar agent; the interface of the undamaged retaining wall is cleaned of oil stains and loose layers, and after being wetted with water, a roller or a brush is used to apply an interface agent on the interface, and after the interface agent is dried and confirmed to be completely sealed, subsequent procedures are carried out;

[0022] S4, build a new retaining wall:

[0023] First, the line is laid, the stone specifications and sizes are tried, the bottom is laid, the group building method is determined, the same building mortar as that of the undamaged retaining wall is selected for mixing, the blocks at the corners are built first, then the blocks at the inner and outer layers are built, and finally the blocks at the middle part are built, and after the retaining wall is built, inspection and acceptance are carried out.

[0024] In the step S4, during the building process of the new retaining wall, every 3-4 skins are a layer height, and each layer height is leveled once.

[0025] The beneficial effects of the present application are:

[0026] 1) The connection structure of the new and old retaining walls and the space pile-contact beam structure formed by the manual hole digging pile and the contact beam between piles in the reinforcing structure can fully utilize the undamaged retaining wall in the reinforcing structure, compared with the conventional reinforcing method, the stability of the reinforcing structure is improved, and the reinforcing construction process is simplified.

[0027] 2) The construction method of the present invention adopts measures to strengthen the connection between the newly built retaining wall and the undamaged part of the retaining wall, including an interface agent to strengthen the bonding between the new and old retaining walls and a rebar anchoring measure to strengthen the connection between the new and old retaining walls. After the damaged retaining wall is removed, the interface is washed clean, and an interface agent is applied after the rebar is anchored to improve the interface adhesion, which is conducive to the connection between the new and old retaining walls and improves the structural stability.

[0028] 3) In the construction method of the present invention, the newly built retaining wall is selected with the same masonry material as the lower retaining wall, which facilitates the overall deformation coordination; and the masonry method is to first build the blocks at the corner, then build the inner and outer layers of blocks, and finally build the middle part of the blocks. The first part can provide a support system for the later part, which is beneficial to construction safety.

[0029] 4) In the reinforcement structure of this invention, the undamaged lower retaining wall is preserved and fully utilized in the reinforced structure; only the damaged soil behind the retaining wall needs to be reinforced, and then a new retaining wall needs to be built to complete the reinforcement of the retaining wall. The construction process is simple, economical, and has broad application prospects. Attached Figure Description

[0030] Fig. 1 This is an elevation view of the retaining wall reinforcement structure of the present invention;

[0031] Fig. 2 This is a plan view of the retaining wall reinforcement structure of the present invention.

[0032] In the diagram, 1-Undamaged retaining wall, 2-Newly built retaining wall, 3-Manually excavated bored pile, 4-Connecting beam between piles, 5-Grouting pipe between soil sections, 6-Rebar installation, 7-Interface agent, 8-Damaged soil behind the retaining wall. Detailed Implementation

[0033] The present invention will be further explained and described below with reference to the accompanying drawings and specific embodiments.

[0034] Example: Figs. 1-2 As shown, the present invention provides a retaining wall reinforcement structure for partial collapse. The retaining wall reinforcement structure includes a retaining wall structure consisting of an undamaged retaining wall 1 and a newly built retaining wall 2 constructed on the undamaged retaining wall 1, and a reinforcement structure consisting of manually excavated piles 3, pile connecting beams 4, and grouting piles 5 installed in the damaged soil 8 behind the retaining wall.

[0035] The artificial hole digging pile 3 is arranged in two rows in the vertical direction in the soil body 8 behind the retaining wall, and the positions of the two rows of artificial hole digging piles 3 correspond to staggered distribution; the artificial hole digging piles 3 in the same row are connected through the horizontally arranged pile interconnection beams 4, and the artificial hole digging pile 3 in the same row and the two artificial hole digging piles 3 in the opposite row and adjacent positions are connected through the horizontally arranged pile interconnection beams 4, and the artificial hole digging pile 3 and the pile interconnection beam 4 jointly form a space pile-interconnection beam structure; the space pile-interconnection beam structure strengthens the reinforcement effect of the artificial hole digging pile on the soil body and strengthens the connection of the independent artificial hole digging pile.

[0036] The soil body inter-grouting pile 5 is arranged in multiple rows parallel to the artificial hole digging pile 3, and the multiple rows of soil body inter-grouting piles 5 are arranged in the horizontal plane and spaced apart from the two rows of artificial hole digging piles 3; since the soil body behind the damaged retaining wall is still in a loose structure, after pouring the soil body inter-grouting pile 5, the loose soil body forms a whole, and a more stable structural system is formed with the space pile-interconnection beam structure.

[0037] The horizontal contact surface is arranged between the undamaged retaining wall 1 and the newly built retaining wall 2, the interface agent 7 is arranged on the horizontal contact surface, the vertical planting rod 6 is arranged at the horizontal contact surface, and the undamaged retaining wall 1 and the newly built retaining wall 2 are fixedly connected through the planting rod 6 and the interface agent 7.

[0038] The row spacing of the artificial hole digging pile 3 is 2400mm, and the distance between adjacent piles is 2000mm; the lower end of the artificial hole digging pile 3 is arranged in the soil bearing layer under the undamaged retaining wall 1.

[0039] The setting height of the pile interconnection beam 4 is 500mm lower than the artificial hole digging pile 3, and the cross-sectional size of the pile interconnection beam 4 is 200mm*250mm.

[0040] The row spacing and the distance between adjacent piles of the soil body inter-grouting pile 5 are both 1000mm.

[0041] The diameter of the planting rod 6 is 25mm, and the total length of the planting rod is 1100mm.

[0042] A construction method of a reinforcing structure for a locally collapsed retaining wall, comprising the following steps:

[0043] S1, reinforcing the soil body behind the retaining wall:

[0044] The reinforcing structure comprises an artificial hole digging pile, a pile interconnection beam, and a soil body inter-grouting pile, the soil body behind the retaining wall has been damaged, if a bored pile or a static pressure pile is used, a mechanical device needs to be used, and the device dynamic load has a greater impact on the soil body; the artificial hole digging pile has a small impact on the soil body, and during the construction process of the artificial hole digging pile, the soil body should be monitored at all times, the change of the soil body should be observed, and emergency measures should be taken at any time to ensure the safety of the construction personnel.

[0045] 1) Construction of the manual hole digging pile 3:

[0046] After the site where the soil body 8 has been damaged by the flat retaining wall, the pile position of the manual hole digging pile 3 is determined by setting out the line, the positioning reference pile is set outside the pile position, the wall formwork is installed, the position of the formwork is corrected by the pile center point; the wall concrete is poured, the pile hole is manually excavated after the concrete forms strength, the hole bottom is cleaned after the excavation reaches the design depth, the accumulated water is removed, and the size and bearing layer are checked; the steel reinforcement cage that has been processed is hoisted into the pile hole, the concrete is poured after the steel reinforcement cage is in place to complete the construction, and the pile head floating layer is removed after the concrete forms strength.

[0047] 2) Construction of the inter-pile contact beam 4:

[0048] The formwork slot of the inter-pile contact beam 4 is excavated according to the position of the manual hole digging pile 3, the contact beam formwork is installed after the slot body is checked and qualified; the beam steel reinforcement is bound in the formwork, and the bound reinforcement needs to be checked and accepted after completion; the concrete is poured in the formwork, and the strength is checked and accepted after formation.

[0049] 3) Construction of the soil inter-body grouting pile 5:

[0050] Before the grouting construction, the site should be pre-graded, the drilling position of the soil inter-body grouting pile 5 is determined according to the position of the manual hole digging pile 3, and the trench and sump are excavated along the drilling position; the drilling machine and the grouting equipment are in place, the grouting pipe is pressed into the soil layer; the closed mud is injected from the drill rod, and then the grouting pipe with a hole diameter of 50 mm is inserted; after the closed mud solidifies, the loose plug of the grouting pipe is punched, and the grouting is performed from bottom to top or from top to bottom, finally forming the soil inter-body grouting pile 5;

[0051] S2, remove the locally collapsed retaining wall:

[0052] The road on the lower side of the undamaged retaining wall 1 is repaired for the convenience of the support equipment to enter; a water interception ditch is set up on the side of the road to drain the underground water after the collapsed part of the retaining wall is removed, to prevent the soil from being washed away and causing the retaining wall to collapse again; the retaining wall is first supported by using an I-beam support to prevent the soil from collapsing during construction and endangering the safety of the construction personnel; after the above work is completed, the retaining wall is removed layer by layer from top to bottom, and the layer height is 1 m;

[0053] S3, set the connection measures between the new and old retaining walls:

[0054] The interface of the undamaged retaining wall 1 is roughened and washed clean with water; the grid wire is hung at the position of the dowel 6 to determine the drilling position; the dowel hole is drilled by impact drilling; after the drilling is completed, the hole is cleaned and the dust is cleaned by a pneumatic machine; the steel bar is planted in the undamaged retaining wall 1 by using the dowel agent.

[0055] The interface of the undamaged retaining wall 1 is cleaned of oil stains and loose layers; after being wetted by water, the interface agent 7 is applied on the interface by using a roller or a brush; after the interface agent is dried and it is confirmed that the interface is completely sealed, the subsequent procedures are carried out.

[0056] S4, building a new retaining wall:

[0057] Before building, the line is laid, the stone materials are arranged and laid according to the specifications and sizes, the building method is determined, the building mortar with the same material as that of the undamaged retaining wall 1 is selected and mixed;

[0058] The building method is that the blocks at the corners are built first, then the blocks of the inner and outer layers are built, and finally the blocks of the middle part are built, each layer height is a layer height of 3-4 skins, and each layer height is leveled once; after the retaining wall is built, the inspection and acceptance are carried out.

[0059] The connecting structure of the new and old retaining walls and the space pile-contact beam structure formed by the artificial hole digging pile and the contact beam between the piles are used in the reinforcing structure, the undamaged retaining wall can be fully utilized in the reinforcing structure, compared with the conventional reinforcing method, the stability of the reinforcing structure is improved, and the reinforcing construction process is simplified.

[0060] The above description is only used to illustrate the technical solutions of the present application but not limit the present application, other modifications or equivalent replacements to the technical solutions of the present application made by those skilled in the art should be covered in the scope of the claims of the present application as long as they do not depart from the spirit and scope of the present application.

Claims

1. A retaining wall reinforcement structure for localized collapse, characterized by: The retaining wall reinforcing structure comprises a retaining wall structure composed of an undamaged retaining wall (1) and a newly built retaining wall (2) built on the undamaged retaining wall (1), and a reinforcing structure composed of artificial hole-digging piles (3) arranged in the damaged soil body (8) behind the retaining wall, inter-pile connecting beams (4) and soil body inter-grouting piles (5); the artificial hole-digging piles (3) are vertically and equidistantly arranged in two rows in the damaged soil body (8) behind the retaining wall, and the positions of the two rows of artificial hole-digging piles (3) are correspondingly staggered; the artificial hole-digging piles (3) in the same row are connected through the horizontally arranged inter-pile connecting beams (4), and one artificial hole-digging pile (3) in the same row and two artificial hole-digging piles (3) in the opposite row and located adjacent to each other are also connected through the horizontally arranged inter-pile connecting beams (4), and the artificial hole-digging piles (3) and the inter-pile connecting beams (4) jointly form a space pile-connecting beam structure; the soil body inter-grouting piles (5) are arranged in multiple rows parallel to the artificial hole-digging piles (3), and the multiple rows of soil body inter-grouting piles (5) and the two rows of artificial hole-digging piles (3) are arranged in a horizontal plane; the undamaged retaining wall (1) and the newly built retaining wall (2) are arranged in a horizontal contact surface, the horizontal contact surface is provided with an interface agent (7), and the vertical position of the horizontal contact surface is provided with a planted bar (6), and the undamaged retaining wall (1) and the newly built retaining wall (2) are fixedly connected through the planted bar (6) and the interface agent (7).

2. The retaining wall reinforcing structure according to claim 1, wherein: The row spacing of the artificial hole-digging piles (3) is 2400mm, and the distance between adjacent piles is 2000mm; the lower end of the artificial hole-digging pile (3) is arranged in the soil bearing layer of the undamaged retaining wall (1).

3. The retaining wall reinforcing structure according to claim 1, wherein: The setting height of the inter-pile connecting beam (4) is 500mm lower than that of the artificial hole-digging pile (3), and the cross-sectional size of the inter-pile connecting beam (4) is 200mm*250mm.

4. The retaining wall reinforcing structure according to claim 1, wherein: The row spacing and the distance between adjacent piles of the soil body inter-grouting pile (5) are both 1000mm.

5. The retaining wall reinforcing structure according to claim 1, wherein: The diameter of the planted bar (6) is 25mm, and the total length of the planted bar is 1100mm.

6. The method for constructing a retaining structure for a partially collapsed soil retaining wall according to any one of claims 1-5, wherein: The method comprises the following steps: S1, reinforcing the damaged soil body behind the retaining wall during construction: The construction of the artificial hole-digging pile: after leveling the site of the damaged soil body behind the retaining wall, the pile position of the artificial hole-digging pile is determined by setting a positioning reference pile outside the pile position, pouring the concrete after installing the wall formwork, and then manually excavating the pile hole after the concrete forms strength, the steel reinforcement cage is hoisted into the pile hole, and the construction is completed after pouring the concrete; The construction of the inter-pile connecting beam: according to the position of the artificial hole-digging pile, the formwork groove of the inter-pile connecting beam is excavated and the connecting beam formwork is installed, the beam steel bars are bound in the formwork, and the construction is completed by pouring the concrete; The construction of the soil body inter-grouting pile: the drilling position of the soil body inter-grouting pile is determined according to the position of the artificial hole-digging pile, a trench and a sump are excavated along the drilling position, the drill rod is pressed into the soil layer, the closed mud is injected into the drill rod and the grouting pipe is inserted, after the closed mud is solidified, the grouting pipe is lifted from bottom to top or from top to bottom to form the soil body inter-grouting pile; S2, removing the locally collapsed retaining wall: The lower side of the undamaged retaining wall is repaired, a water collecting ditch is set on the side of the road to drain the underground water after the collapsed retaining wall is removed, the retaining wall is supported by using an I-shaped steel support, and the retaining wall is removed layer by layer from top to bottom, and the height of each layer is 1 m; S3, setting a connection measure between the new and old retaining walls: The interface of the undamaged retaining wall is chiseled and washed, the drilling position is determined by grid hanging line at the position of the anchor rod, the anchor rod hole is drilled by using an impact drill, and the anchor rod is implanted into the undamaged retaining wall by using an anchor rod agent; the interface of the undamaged retaining wall is cleaned of oil stains and loose layers, and after being wetted with water, the interface agent is applied on the interface by using a roller or a brush, and after the interface agent is dried and it is confirmed that the interface is completely sealed, subsequent procedures are carried out; S4, building the new retaining wall: First, the line is laid, the stone is arranged and laid according to the specifications and sizes, the building method is determined, the building mortar which is the same as the material of the undamaged retaining wall is selected and mixed, the block at the corner is built first, then the blocks at the inner and outer layers are built, and finally the blocks at the middle part are built, and after the retaining wall is built, the inspection and acceptance are carried out.

7. The method of construction according to claim 6, wherein: In the step S4, during the building process of the new retaining wall, each 3-4 skins are a layer height, and each layer height is leveled once.

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