CN113982004A - Anchor cable-reinforced soil combined soil retaining member and construction method thereof - Google Patents

Abstract

The invention discloses an anchor cable-reinforced soil combined soil retaining member and a construction method thereof, belonging to the technical field of slope support; the wall surface module is inserted in the slots of the upright columns at two sides; the inner side surface of the wall surface module is provided with a connecting member, a gap is formed between the connecting member and the wall surface module, one end of the reinforced material is sleeved on the connecting member and clamped in the gap, and fillers are arranged between the reinforced materials of the upper layer and the lower layer; when the soil body is settled, the reinforced material can move downwards along the connecting component; the invention obviously improves the bearing capacity and the deformation resistance of the side slope, solves the problem that the reinforcing material in the existing connecting structure is easy to damage, and is suitable for various geological conditions.

Description

Anchor cable-reinforced soil combined soil retaining member and construction method thereof

Technical Field

The invention belongs to the technical field of slope support, and particularly relates to an anchor cable-reinforced soil combined soil retaining component and a construction method thereof.

Background

The prestressed anchor cable structure is characterized in that two members, namely a retaining wall and a prestressed anchor cable, which can be used independently are combined according to a certain mode, a supporting structure is formed through the interaction of the anchor cable, the retaining wall and a slope rock-soil body, and rock-soil pressure generated by landslide thrust or unloading relaxation of the slope is jointly born, so that the slope is in a stable state. Because prestress can be applied in the anchor cable in advance, the prestressed anchor cable supporting structure can play a role in actively controlling the relaxation and deformation of the side slope. The prestress of the anchor cable enables the unstable sliding body to be in a three-dimensional stress state with high confining pressure, and compared with the condition of single-axis pressure and low confining pressure, the mechanical property of the rock-soil body is better. At the moment, the structural surface is in a compression state, and the integrity of the slope rock-soil body is obviously improved. The anchor cable can act on the frame structure to provide resistance to bearing load; the stratum can generate a pressure area and play a role in reinforcing the stratum; the mechanical property of the stratum can be improved, so that the frame structure and the stratum form a combined body which works together, and the combined body can effectively bear the tensile force and the shearing force. The wall structure plays the constraint effect to the deformation body under the constraint effect of anchor rope, makes the deformation body keep the wholeness, and the local deformation on control slope body surface prevents that local destruction from resulting in the whole destruction simultaneously. The frame anchor cable can be used for reinforcing soil slopes and rock slopes, can be used independently and can be combined with other retaining structures for reinforcing the slopes, and has a wide application prospect.

The reinforced earth technology is used for increasing the bearing capacity of a filled earth body and reducing the deformation of the earth body. The working mechanism of the conventional reinforced earth technology is generally considered to be that the reinforced material improves the bearing capacity of the filler and reduces the deformation of the filler by restraining the filler. When the filler is deformed horizontally, the reinforced material can restrain the deformation of the soil body, and the larger the restraint of the reinforced material on the filler is, the more remarkable the improvement of the mechanical property of the filler can be. From the current research results, the action mechanism of the reinforced soil is related to the constraint capacity of the reinforcement on the filler, and the constraint capacity depends on the mechanical properties of the reinforcement and the filler and the interaction between the reinforcement and the filler. Due to the wide applicability of the modern reinforced earth technology, the technology is applied to the fields of geotechnical engineering such as roads, railways, retaining walls and the like, and a large number of engineering problems are solved. The method has the advantages of low cost and simple construction, and has economic and applicable advantages if the advantages of the two are combined.

The frame anchor cable structure has the defects that the frame anchor cable structure belongs to a recessive support, the monitoring and detection on the support quality and reliability are difficult, roof fall accidents without obvious foreboding can occur sometimes, in addition, the support effect is difficult to guarantee for soft rocks with large deformation, in addition, most frame anchor cable structures are used for guaranteeing the greening effect, greening plants are planted in the blank spaces of the frame beams, soil body loss in the blank spaces is easy to cause under the action of rainwater, and finally the structure is caused to fail. The existing block type reinforced earth retaining wall is characterized in that a panel is composed of prefabricated building blocks, a block of modules is built, and a rib material is connected to the back of the block. The reinforced retaining wall panel has the advantages of variable block styles, attractive structure, prefabricated production and rapid construction, can shorten the construction period and obviously reduce the construction cost, but the prior research shows that the panel formed by the prefabricated blocks has smaller overall rigidity, larger wall deformation, insufficient earthquake resistance, poorer safety in the piling process, higher cost and poorer economy. The integral reinforced retaining wall is formed by the whole cast-in-place concrete. The reinforced retaining wall panel has the advantages of high integral rigidity, small wall deformation, good structural stability, complex cast-in-place process, high difficulty of concrete formwork erection, high cost and no greening effect basically. And the connection of reinforced earth retaining wall and muscle material mainly relies on the connection effect of buckle effect and wall back connection component between the module, and when the soil body takes place to subside under long-time effect, traditional connected mode can make the muscle material take place to destroy, loses to be connected between retaining wall and the muscle material.

Disclosure of Invention

The invention overcomes the defects of the prior art, provides an anchor cable-reinforced earth combined soil retaining member and a construction method thereof, and solves the problem that a reinforcement in the existing connecting structure is easy to damage.

In order to achieve the purpose, the invention is realized by the following technical scheme:

an anchor cable-reinforced soil combined soil retaining member comprises upright columns and wall modules, wherein the upright columns are provided with slots, and the wall modules are inserted into the slots of the upright columns on two sides; the inner side surface of the wall surface module is provided with a connecting member, a gap is formed between the connecting member and the wall surface module, one end of the reinforced material is sleeved on the connecting member and clamped in the gap, and fillers are arranged between the reinforced materials of the upper layer and the lower layer; when the soil body subsides, the reinforcement material can move down along the connecting component.

In the preferred scheme, the stand column is provided with a reserved anchor hole for mounting a prestressed anchor cable.

Preferably, the inner side surface of the wall surface module is provided with a plurality of connecting members side by side.

Preferably, the connecting member is an L-shaped steel bar member.

Preferably, the wall surface module is provided with a pore channel for drainage and greening.

Preferably, the reinforced material is geogrid or a rib belt.

Preferably, the rib belts are connected to the horizontal rods, and then the horizontal rods are embedded into the gaps.

Preferably, the upright posts and the wall surface modules are prefabricated components.

Preferably, the upright post is an I-shaped upright post.

The construction method of the soil blocking member comprises the following steps:

1) and leveling the field, excavating a foundation pit of the upright column foundation and pouring the foundation.

2) Inserting the prefabricated stand columns into holes reserved in the foundation, inserting the wall surface modules into two adjacent stand columns, filling and compacting the filling materials, filling the filling materials into the reinforcement material laying position, laying the reinforcement material on the compacted filling materials, and sleeving the reinforcement material and the connecting members and clamping the reinforcement material and the connecting members into the gaps.

3) And repeating the previous step, and constructing from bottom to top until the design height of the whole slope.

4) And (4) sequentially installing prestressed anchor cables from the holes reserved on the upright columns and applying prestress.

5) And (4) determining whether subsequent tension supplement is needed according to the loss degree of the prestress in the step (4), and after the prestress is applied, sealing the anchor on the upright post, and finishing construction.

Compared with the prior art, the invention has the following beneficial effects:

the invention has the advantages of both the common reinforced earth structure and the prestressed anchor cable frame structure, and is specifically embodied as follows:

1. the soil retaining member adopts the upright posts and the wall panels which are directly prefabricated and assembled, so that the production, the transportation and the stacking are convenient, the upright posts and the wall panels are connected in a clamping and embedding way, and other connecting members are not needed. The L-shaped reinforcing steel bar component on the back of the panel can be directly connected with the grids, so that the quick and reliable connection of the columns and the plates and the connection of the plates and the reinforcing steel bars are realized.

2. The rib material of the soil retaining member is connected to the L-shaped rib member at the back of the panel, and the rib material can move downwards along the steel bar, so that the rib material damage caused by the traditional connection mode is avoided.

3. The soil retaining member adopts a combined structure of the prestressed anchor cables and the reinforced soil, has stable mechanical property, and obviously improves the bearing capacity and the deformation resistance of the side slope. And the retaining member reduces the use amount of prestressed anchor rods, anchors and grids, and reduces the cost and the difficulty of construction technology. Construction is convenient, manpower is greatly saved, and the construction period is effectively reduced.

4. The flat wall surface module of the soil retaining component is provided with the strip-shaped pore channels, can be used for draining soil bodies behind a slope without causing loss of the soil bodies, and can also be used for planting plants such as parthenocissus tricuspidata and the like to afforest the slope bodies.

5. The soil retaining member of the invention is suitable for various geological conditions, and can also adopt various forms, such as vertical type, step type and inclined type.

Drawings

FIG. 1 is a cross-sectional view of a retaining member according to the present invention;

FIG. 2 is a schematic view of the overall external surface structure of a retaining structure in practice;

FIG. 3 is a schematic view of the structure of the inner surface of the whole retaining structure in practice;

FIG. 4 is a schematic view of the exterior surface configuration of an embodiment of a flat wall module;

FIG. 5 is a schematic view of the inner surface structure of the flat wall modules of the embodiment;

FIG. 6 is a schematic structural diagram of an I-shaped upright post in the embodiment;

FIG. 7 is a schematic view showing the structure of the connection of the rib band and the panel in embodiment 2;

in the drawings: 1-foundation, 2-i-column, 3-slab-shaped wall module, 4-steel bar connector, 5-geogrid, 6-anchor, 7-filler, 8-drainage channel, 9-anchor hole, 10-horizontal steel bar and 11-rib band.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail with reference to the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solution of the present invention is described in detail below with reference to the embodiments and the drawings, but the scope of protection is not limited thereto.

Example 1

Referring to the attached drawing 1, the anchor cable-reinforced soil combined retaining member of the embodiment includes a foundation 1, an i-shaped column 2, a flat wall surface module 3, a reinforcing steel bar connector 4, a geogrid 5, an anchor rod 6, a filler 7, a drainage channel 8, and an anchor hole 9. The drainage channels 8 may be of any shape and size as required, and are not limited to strip channels. Referring to fig. 2-3, the i-shaped upright posts 2 are embedded on the foundation 1 in a clamping manner, the flat plate-shaped wall surface module 3 is inserted into the flange of the adjacent i-shaped upright post 2, referring to fig. 4-5, the back surface of the flat plate-shaped wall surface module 3 is provided with a steel bar connecting piece 4, and the wall surface is provided with a drainage pore canal 8; reinforcing bar connecting piece 4 is "L" reinforcing bar component, forms the clearance between reinforcing bar connecting piece 4 and the flat wall module 3, and 5 pot heads of geogrid are on reinforcing bar connecting piece 4 and block in the clearance, make reinforcing bar connecting piece 4 and geogrid 5 zonulae occludens. Filling materials 7 are filled between the upper and lower geogrids 5; when the soil body subsides, geogrid 5 can move down along steel bar connection 4, has avoided the destruction of geogrid 5. Referring to fig. 6, an anchor hole 9 is reserved on the i-shaped upright post 2; for connection with the anchor rod 6.

The construction method of the soil retaining member comprises the following specific steps:

(1) production and transportation of prefabricated parts: the prefabricated steel plate wall surface module comprises prefabricated I-shaped stand columns 2 and a flat plate-shaped wall surface module 3, a special prefabricated field can be arranged in a professional prefabricated part production factory or on site for prefabrication, anchor holes 9 are reserved on the stand columns according to the positions of designed anchor holes during prefabrication, drainage hole channels 8 are reserved on the flat plate-shaped wall surface module 3, and L-shaped steel bar members are pre-buried in the back of a panel.

(2) Foundation construction: and (3) leveling the field, excavating a foundation trench according to the designed trench, and casting a foundation 1 in situ, wherein the top of the foundation 1 is reserved with a groove for inserting the stand column.

(3) The upright post and the panel are installed: the I-shaped upright posts 2 are inserted into the grooves of the foundation 1, so that the foundation 1 and the upright posts are firmly connected, and the prefabricated first layer of flat plate-shaped wall surface module 3 is arranged on the foundation 1 and between the I-shaped upright posts 2 on the two sides.

(4) And (3) reinforced soil construction: filling 7 according to the design, and layering and compacting, when the geogrid 5 is laid, sleeving the geogrid 5 on the steel bar connecting piece 4 at the back of the panel and clamping the geogrid in the gap to finish the layered construction of the reinforced soil.

(5) And (5) repeating the steps 3 and 4, and completing the soil filling construction from bottom to top.

(6) And (3) anchor rod installation: and (3) installing an anchor rod 6 at the position of the reserved anchor hole 9 of the I-shaped upright post 2, applying prestress according to the designed prestress, and performing anchor sealing treatment when the prestress of the anchor rod 6 is not lost.

(7) And sowing seeds of the climbing plants in the channel reserved on the wall panel for slope greening.

In the installation process of the wall panel in the step 3, for a low retaining wall, temporary support is not needed to keep the stability of the upright posts and the wall panel, when the retaining wall is high, the retaining wall needs to be temporarily supported, and the retaining wall can be removed after prestress is applied.

Example 2

The main structure of the embodiment is the same as that of embodiment 1, except that the clamping material is a rib-belt type geogrid, as shown in fig. 7, when the flat-plate-shaped wall surface module 3 is connected with the rib belt 11, the rib belt 11 can be tied on a horizontal steel bar 10, and then the horizontal steel bar 10 is inserted into a row of L-shaped steel bar members to be embedded into the gap.

The specific construction steps are that in the reinforced earth construction process of step 4 in example 1, when the reinforcing material buried in the back of the wall panel is the reinforcing band 11, the reinforcing band 11 can be tied to a horizontal reinforcing bar 10, and the horizontal reinforcing bar 10 with the reinforcing band 11 can be inserted into the L-shaped reinforcing bar member. When the soil body subsides, the muscle area 11 can be followed "L" shape reinforcing bar component and moved down, has effectively reduced the muscle material destruction that leads to because the slope body subsides.

While the invention has been described in further detail with reference to specific preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. An anchor cable-reinforced soil combined soil retaining member is characterized by comprising upright columns and wall modules, wherein the upright columns are provided with slots, and the wall modules are inserted into the slots of the upright columns on two sides; the inner side surface of the wall surface module is provided with a connecting member, a gap is formed between the connecting member and the wall surface module, one end of the reinforced material is sleeved on the connecting member and clamped in the gap, and fillers are arranged between the reinforced materials of the upper layer and the lower layer; when the soil body subsides, the reinforcement material can move down along the connecting component.

2. The anchor cable-reinforced soil combined retaining member as claimed in claim 1, wherein the column is provided with a reserved anchor hole for installation of a pre-stressed anchor cable.

3. The anchor cable-reinforced earth combined retaining member as claimed in claim 1, wherein the wall surface module is provided at its inner side with a plurality of connecting members side by side.

4. The anchor cable-reinforced earth combined retaining member as claimed in claim 3, wherein the connecting member is an L-shaped reinforcing bar member.

5. An anchor cable-reinforced earth combined soil retaining member as claimed in claim 1, wherein said wall surface module is provided with a hole for drainage and greening.

6. An anchor cable-reinforced soil combined retaining member as claimed in claim 1, wherein the reinforcing material is geogrid or a rib band.

7. The anchor cable-reinforced soil combined retaining member as claimed in claim 6, wherein the reinforcing strips are connected to the horizontal bars, and the horizontal bars are inserted into the gaps.

8. The anchor cable-reinforced earth combined soil retaining member as claimed in claim 1, wherein the columns and the wall surface modules are prefabricated members.

9. The anchor cable-reinforced soil combined retaining member as claimed in claim 1, wherein the column is an i-shaped column.

10. A construction method of a soil retaining member according to any one of claims 1 to 9, comprising the steps of:

1) leveling a field, excavating a foundation pit of the upright column foundation and pouring a foundation;

2) inserting the prefabricated stand columns into holes reserved in the foundation, inserting the wall surface modules into two adjacent stand columns, filling and compacting fillers, filling the fillers to the reinforcement material laying position, laying the reinforcement material on the compacted fillers, and sleeving the reinforcement material and the connecting members and clamping the reinforcement material and the connecting members into gaps;

3) repeating the previous step, and constructing from bottom to top until the design height of the whole slope is reached;

4) sequentially installing prestressed anchor cables in holes reserved on the stand columns and applying prestress;

5) and (4) determining whether subsequent tension supplement is needed according to the loss degree of the prestress in the step (4), and after the prestress is applied, sealing the anchor on the upright post, and finishing construction.

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