Spraying anchor protection structure for brick concrete construction waste recycled concrete

Abstract

The utility model discloses a spray anchor protection structure of brick concrete construction waste recycled concrete, a protection assembly is arranged at the side slope end of a slope body, the protection assembly comprises anchor rods, reinforcing ribs and twisted steel meshes, the anchor rods are symmetrically inserted into an inner cavity of the side slope end of the slope body, and the reinforcing ribs are arranged in the inner cavity of the side slope end of the slope body. The twisted steel meshes are laid at the side slope end of the slope body in a mutually crossed mode, reinforcing ribs are arranged at the front end of the anchor rod and located on the outer sides of the twisted steel meshes in a sleeved mode, and concrete is evenly sprayed on the twisted steel meshes. The shotcrete anchor protection structure of the brick-concrete construction waste recycled concrete not only meets the protection requirement of slope stability, but also meets the environmental protection requirement of green and low carbon, and effectively promotes the reduction application of the construction waste.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering construction, in particular to a shotcrete and anchor protection structure for recycled concrete made from brick-concrete construction waste. Background Art

[0002] With the implementation of the renovation of old urban communities, more than 1.5 billion tons of construction waste will be generated on average every year, and brick-concrete construction waste accounts for more than 80%. It is difficult to separate bricks and concrete themselves, and due to the existence of brick particles, the available utilization rate of the recycled aggregate of brick-concrete mixture is low, resulting in the use of the recycled aggregate of brick-concrete mixture to realize slope construction, thus leading to the problem of poor stability of existing slopes.

[0003] This technology makes full use of brick-concrete construction waste to make recycled concrete, solves problems such as large porosity, strong water absorption, and low strength of brick-concrete recycled concrete. Therefore, a shotcrete and anchor protection structure for brick-concrete construction waste recycled concrete is designed, which not only meets the requirements of slope stability protection but also realizes the environmental protection requirements of green and low-carbon. Content of the Utility Model

[0004] Aiming at the deficiencies of the prior art, the utility model provides a shotcrete and anchor protection structure for brick-concrete construction waste recycled concrete, which solves the problem of poor stability of existing slopes caused by large porosity, strong water absorption, and low strength of brick-concrete recycled concrete.

[0005] To achieve the above purposes, the utility model is realized through the following technical solutions: A shotcrete and anchor protection structure for brick-concrete construction waste recycled concrete, including a slope body, and a protection component is arranged at the slope end of the slope body.

[0006] The protection component includes anchor bolts, reinforcing bars, and a threaded steel mesh sheet. The anchor bolts are symmetrically inserted into the inner cavity of the slope end of the slope body. The threaded steel mesh sheets are cross-laid on the slope end of the slope body. A reinforcing bar is sleeved outside the front end of the anchor bolt and located outside the threaded steel mesh sheet. Concrete is evenly sprayed on the threaded steel mesh sheet.

[0007] Preferably, a catch ditch is arranged at the top slope end of the slope body.

[0008] Preferably, a drainage ditch is arranged at the lower slope end of the slope body.

[0009] Preferably, drain holes are symmetrically arranged at the slope end of the slope body.

[0010] Preferably, the diameter of the threaded steel mesh sheet is φ10, and the spacing is 200mm * 200mm.

[0011] Preferably, the length of the anchor bolt is 2m.

[0012] Preferably, the ribbed steel bar mesh is arranged as a single-layer bidirectional steel bar mesh.

[0013] The utility model provides a shotcrete protection structure for brick-concrete construction waste recycled concrete. Compared with the prior art, it has the following beneficial effects:

[0014] 1. For the shotcrete protection structure of the brick-concrete construction waste recycled concrete, by improving the production, screening, and processing of recycled coarse aggregates, the quality of recycled aggregates is controlled. Since the recycled aggregates contain unscreened brick slag, the properties of the mixed coarse aggregates are unstable, affecting the strength and stability of recycled concrete. By strictly controlling the sorting, cleaning, and crushing treatment of recycled aggregates, their quality is ensured.

[0015] 2. For the shotcrete protection structure of the brick-concrete construction waste recycled concrete, by optimizing the mix proportion of recycled concrete: Since the properties of recycled aggregates are different from those of natural aggregates, the mix proportion needs to be redesigned to ensure the mechanical properties and durability of the concrete. By adding silica fume as an admixture, the bonding ability between aggregates and paste is improved, and recycled C20 shotcrete that meets the requirements is prepared.

[0016] 3. For the shotcrete protection structure of the brick-concrete construction waste recycled concrete, the slope shotcrete protection structure is optimized: The bonding performance between the brick-concrete construction waste recycled concrete and the soil slope, as well as between the brick-concrete construction waste recycled concrete and the ribbed steel bar mesh, is not as good as that of conventional C20 concrete, affecting the overall performance of the concrete. Measures such as ribbed steel bar meshes and anchor rods are taken to improve the interface bonding and enhance the overall stability of the slope. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the utility model;

[0018] Figure 2 is a schematic diagram of the net spraying structure of the utility model;

[0019] Figure 3 is a schematic diagram of the slope shotcrete scaffolding structure of the utility model;

[0020] Figure 4 is a cross-sectional view of the slope structure of the utility model;

[0021] Figure 5 is a schematic diagram of the drain hole structure of the utility model;

[0022] Figure 6 is a schematic diagram of the slope concrete structure of the utility model.

[0023] In the figure: 1. Slope body; 2. Intercepting ditch; 3. Drainage ditch; 4. Protection component; 41. Anchor rod; 42. Reinforcing bar; 43. Ribbed steel bar mesh; 5. Drain hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0025] Please refer to Figure 1-6 , the present utility model provides a technical solution: a shotcrete and anchor protection structure for recycled concrete of brick-concrete construction waste, including a slope body 1, and a protection component 4 is arranged at the slope end of the slope body 1.

[0026] The protection component 4 includes anchor bolts 41, reinforcing bars 42 and a threaded steel mesh sheet 43. The anchor bolts 41 are symmetrically inserted into the inner cavity of the slope end of the slope body 1, and the diameter of the anchor bolts 41 is Φ20 and the length is 2000 mm. The threaded steel mesh sheets 43 are cross-laid on the slope end of the slope body 1. A reinforcing bar 42 is sleeved outside the threaded steel mesh sheet 43 at the front end of the anchor bolt 41. Among them, the reinforcing bar 42 is HRB400 Φ14@2000. Concrete is evenly sprayed on the threaded steel mesh sheet 43. Among them, the concrete mix ratio is: ordinary Portland cement: drinking water: fine aggregate machine-made sand: coarse aggregate brick-concrete recycled coarse aggregate: accelerating admixture: silica fume = 1:0.43:1.96:1.96:0.03:0.07, and the thickness of the concrete is 100 mm.

[0027] Drainage holes 5 are symmetrically arranged at the slope end of the slope body 1. The upper half of the drainage holes 5 is arranged in a staggered and uniform manner, and the bottom is wrapped with geotextile permeable cloth.

[0028] A catchment ditch 2 is arranged at the top slope end of the slope body 1, and a drainage ditch 3 is arranged at the lower slope end of the slope body 1. The diameter of the threaded steel mesh sheet 43 is φ10, and the spacing is 200 mm * 200 mm. The length of the anchor bolt 41 is 2 m, and the threaded steel mesh sheet 43 is arranged as a single-layer bidirectional steel mesh.

[0029] The construction process flow is as follows:

[0030] Measurement and layout → Earthwork excavation → Erection of construction scaffolding → Manual repair of slope → Installation of soil nails → Hanging net → Spraying concrete

[0031] 1. Measurement and layout

[0032] According to the requirements of the design elevation drawing, within the construction scope, fixed piles are set at the starting and ending points with instruments, and are densified as conditions permit in the middle, and it should be ensured that they are not damaged during the construction stage. The excavation slope surface is released for positioning and layout. The positions of other soil nail holes are measured with a steel tape based on the fixed piles, and the whole section is unified for lofting. The hole position error shall not exceed ±50 mm. The measured hole positions are marked with semi-permanent marks, and it is strictly prohibited to loft while constructing.

[0033] The positions of the anchor rods 41 and the drainage holes 5 shall be lofted according to the design, and their spacing can be adjusted appropriately. In case of uneven existing cut slopes or special difficult sites, on the premise of ensuring the stability of the slope body 1 and the structural safety, the positioning accuracy can be appropriately relaxed or the anchor hole positioning can be adjusted.

[0034] 2. Earth excavation and manual slope trimming

[0035] For the excavated slope section, it shall be promptly trimmed manually. The lower retaining wall section shall be vertically excavated, and the upper slope rate shall be 1:1.0 for slope setting. Excavation shall be carried out in sections and layers, and corresponding support shall be carried out in a timely manner.

[0036] Main technical measures:

[0037] When using machinery for earthwork operations, over-excavation of the side wall or loosening of the side wall soil body are strictly prohibited. The slope is preferably trimmed by small tools or shovels to ensure that the slope is flat and conforms to the designed slope.

[0038] 3. Drainage system:

[0039] The slope support shall be constructed under the condition of draining groundwater. Appropriate drainage measures shall be taken, including surface drainage, internal drainage of the support, and slope drainage, to avoid the soil body being in a saturated state and reduce the hydrostatic pressure acting on the surface layer. The surface within the support range around the slope shall be trimmed, and the catch ditch 2 shall be constructed to prevent surface precipitation from infiltrating underground. The ground with a width of 1 m near the slope top shall be appropriately raised, with the inside higher than the outside, to facilitate the runoff to move away from the slope. The concrete catch ditch 2 and the drainage ditch 3 shall be adopted.

[0040] 4. Scaffold erection

[0041] The scaffold steel pipes shall adopt φ48x3.0 steel pipes. The horizontal, longitudinal, and vertical spacing of the steel pipes shall all be 1.0 m. The height of the guardrail shall be 1.2 m. The first vertical rod at the slope angle shall be inserted into the bottom of the drainage ditch 3. Each vertical rod and horizontal rod along the slope shall be driven into the mountain soil layer or rock layer for fixation. The inclined rods along the slope shall be erected in three layers and used as diagonal braces at the lower part of the scaffold. The diagonal braces shall be supported on the horizontal ground, and the scaffold boards shall be laid on the construction operation layer. The form of the scaffold erection is shown in Figure 3 .

[0042] Erection requirements

[0043] 1 Before the scaffold is erected, the positions of the anchor rods 41 must be marked out in advance to prevent conflicts with the scaffold.

[0044] 2 The scaffold shall be erected strictly in accordance with the requirements of the "Safety Technical Code for Steel Tubular Fastener Scaffolds in Construction" JGJ130-2011.

[0045] The steel pipes used for the scaffolding should be of good quality, without damage or deformation, and aligned vertically.

[0046] 4 The construction platform is built with wooden square timbers. During the construction process, attention should be paid to construction safety, the tightness of the screws between the fasteners, and both ends of the gangplank should be firmly fixed on the scaffolding.

[0047] 5 Manually clean the loosened part of the foundation thoroughly and chisel grooves on the foundation to ensure the firmness of the construction scaffolding foundation.

[0048] 6 The scaffolding and platform should be built stably and have the ability to resist impact and vibration.

[0049] 5. Anchor rod 41 and installation of drain holes 5.

[0050] ① Hole formation: According to the formation conditions, use manual Luoyang shovel combined with spiral drill to form holes mechanically. After drilling, conduct hole cleaning inspection. After hole formation, put in the steel bars. Anchor rod 41 uses C20 steel bars, and insert the grouting pipe to the bottom of the hole.

[0051] ② Anchor rod 41 extends into the slope not less than 500mm, is welded and connected with the reinforcement 42, and the spacing is 2000mm.

[0052] ③ Grouting: Inject cement slurry with a water-cement ratio of 0.5 using a grouting pump, and the grouting pressure is 0.3 - 0.4MPa. Stop grouting until the slurry returns from the hole mouth.

[0053] ④ Set the drain holes 5 at a horizontal and vertical spacing of 2.0m, use Φ100 PVC plastic pipes, with a length of 500mm, and slope outward at 5°.

[0054] Main technical measures:

[0055] 1. After drilling, hole cleaning inspection should be carried out. Immediately deal with local water seepage, hole collapse or fallen loose soil in the hole. After hole formation, install the soil nail steel bars and grout in time.

[0056] 2). Before the steel bars are placed into the hole, positioning brackets should be set first to ensure that the steel bars are in the center of the drilled hole.

[0057] 3). The bottom end of the grouting conduit should be inserted into the bottom of the hole first, and grouting is carried out by bottom grouting method. Before initial setting, replenish the slurry 1 - 2 times to ensure that the hole is filled with slurry. The filling coefficient of the slurry injected into the hole must be greater than 1.

[0058] 6. Mesh hanging

[0059] Hang the ribbed steel bar mesh sheet 43 on the leveled slope surface. The ribbed steel bar mesh sheet 43 is single-layer and two-way. The mesh-sprayed steel bars extend into the concrete retaining wall by 350mm. The end of the soil nail is tightly pressed and welded firmly with the ribbed steel bar mesh sheet 43 using a horizontal reinforcing bar of ф14.

[0060] One expansion joint shall be set every 15m along the length of the slope, with a width of 2cm. The joint shall be filled with asphalt hemp or other waterproof materials. Please refer to Figure 2 and 4 .

[0061] Main technical measures:

[0062] ① The connection between the end of the soil nail steel bar and the deformed steel bar mesh 43 in the surface layer shall be welded firmly and reliably.

[0063] ② Before spraying the shotcrete, the deformed steel bar mesh 43 in the surface layer shall be firmly fixed on the side wall and meet the requirements of the specified protective layer thickness.

[0064] 7. Shotcrete

[0065] C20 recycled shotcrete: The mix ratio is ordinary Portland cement: drinking water: fine aggregate (machine-made sand): coarse aggregate (brick-concrete recycled coarse aggregate): admixture (accelerator): admixture (silica fume) = 1:0.43:1.96:1.96:0.03:0.07

[0066] The spraying sequence of the shotcrete shall be carried out successively from bottom to top. First, spray the concave parts and holes, and then the flat parts. The distance between the nozzle and the sprayed surface shall be preferably controlled within the range of 0.8 - 1.5m. The spraying direction shall be perpendicular to the sprayed surface. However, at the reinforcement part, the back of the reinforcement shall be sprayed first, and then the front of the reinforcement, to prevent voids from appearing behind the reinforcement.

[0067] To ensure that the thickness of the shotcrete during construction reaches the specified value, short steel bars can be vertically driven into the side wall surface as marks.

[0068] Covering and curing: When the spraying operation is completed, immediately cover it with a plastic film. When the concrete reaches the initial setting, immediately start watering for curing to keep the concrete surface constantly moist. The curing duration is generally 7 - 10 days.

[0069] 8. Retaining wall construction

[0070] 1. According to the design construction drawing, a 500mm thick concrete retaining wall shall be set at the toe of the slope. The retaining wall shall be buried 500mm deep and exposed 1000mm; the construction joint of the retaining wall and the slope surface shall be set at the same position. Please refer to Figure 4 .

[0071] 2. The concrete strength grade of the retaining wall shall be C25, and it shall be cast in place on site.

[0072] 3. The geometric dimensions of the retaining wall body shall meet the design requirements.

[0073] 4. The horizontal spacing of the reserved drainage holes 5 in the retaining wall is 2.0m, and the allowable deviation of their positions is 15mm. The outlet of the lowest drainage hole 5 is 30cm above the ground, and a slope of 5° outward is set.

[0074] 5. The elevation of the top of the retaining wall shall meet the design requirements, and the allowable deviation value is ±20 mm.

[0075] 6. After the concrete is poured, it shall be cured according to relevant regulations. The backfill of the wall shall start when the strength of the retaining wall concrete reaches 75% of the design strength.

[0076] 7. The concrete pouring of the retaining wall shall be homogeneous, dense, flat, without honeycombing and pockmarks, without defects, and the strength shall meet the design requirements.

[0077] 8. The formwork of the retaining wall is reinforced by a combination of tie bars and steel pipe fasteners.

[0078] 9. During construction, the height of the retaining wall and the height of the exposed part are the same, and the foundation excavation is inclined inward.

[0079] 10. When the strength of the retaining wall reaches more than 75% of the design strength, the construction of the backfill material behind the wall can be carried out. The backfill behind the wall must be uniform, paved flat by hand, and compacted in layers. The thickness of each layer shall not exceed 20 cm. The compaction degree requirement is ≥95%.

[0080] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or sequence between these entities or operations. Moreover, the terms "comprising", "including" or any other variation thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation. An element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0081] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A shotcrete and anchor protection structure for recycled concrete of brick-concrete construction waste, comprising a slope body (1), characterized in that: A protection component (4) is provided at the slope end of the slope body (1); The protection component (4) includes anchor bolts (41), reinforcing bars (42) and a threaded steel bar mesh (43). The anchor bolts (41) are symmetrically inserted into the inner cavity of the slope end of the slope body (1). The threaded steel bar mesh (43) is laid crosswise on the slope end of the slope body (1). A reinforcing bar (42) is sleeved outside the threaded steel bar mesh (43) at the front end of the anchor bolt (41). Concrete is evenly sprayed on the threaded steel bar mesh (43).

2. The shotcrete protection structure for recycled concrete of brick and concrete construction waste according to claim 1, characterized in that: A catch water ditch (2) is provided at the top slope end of the slope body (1), and a drainage ditch (3) is provided at the lower slope end of the slope body (1).

3. The shotcrete protection structure of a brick-concrete construction waste recycled concrete according to claim 1, characterized in that: Drainage holes (5) are symmetrically formed at the slope end of the slope body (1).

4. The shotcrete and anchor protection structure of a brick-concrete construction waste recycled concrete according to claim 1, characterized in that: The diameter of the threaded steel bar mesh (43) is φ10, and the spacing is 200mm×200mm.

5. The shotcrete and anchor protection structure for the recycled concrete of brick-concrete construction waste according to claim 1, characterized in that: The length of the anchor bolt (41) is 2m.

6. The shotcrete protection structure for the recycled concrete of brick-concrete construction waste according to claim 4, characterized in that: The threaded steel bar mesh (43) is arranged as a single-layer bidirectional steel bar mesh.

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