CN215290101U - Multi-petal combined anchor rod centering support device - Google Patents

Abstract

The utility model discloses a many lamellas, can make up formula stock centering support device relates to water conservancy water and electricity, road, bridge, geotechnical engineering and consolidates the processing field. It comprises an anchor rod and a centering bracket; the centering stent comprises a first centering stent petal, a second centering stent petal and a centering spine; the stock parcel is to support lamella in first pair and the second pair, and support lamella passes through fixing device with the second pair and connects in first pair, and fixing device detains the door including being located first knot tooth, first knot, and the door is detained to the second, and the second is detained the tooth. The utility model provides an in the present stock work progress, because traditional centering support is mostly the site worker direct processing and brings the production quality uncontrollable, the unable effective problem placed in the middle of the stock reinforcing bar.

Description

Multi-petal combined anchor rod centering support device

Technical Field

The utility model relates to a water conservancy water and electricity, road, bridge, geotechnical engineering reinforcement processing field, the more specifically it is that it is a many lamellas, can make up formula stock centering support device that says so.

Background

The rock-soil anchoring technology is an in-situ reinforced soil technology for improving the stability of side slopes, retaining walls, excavated bodies and the like, and can be traced back to coal mine reinforcement engineering of northern Wales in 1890 years at first, and then a rock-soil body excavation supporting theory represented by a new Austrian tunnel excavation method is formed. With the development of more than a century, the technology is widely applied to various engineering fields in the world, and particularly the achievement of the technology on the aspects of water conservancy and hydropower is more remarkable. At present, anchor rod support has become an important technology for supporting and reinforcing dam foundations, side slopes and underground caverns of hydraulic and hydroelectric engineering due to the beneficial characteristics of common materials, flexibility and applicability, quick construction, proper manufacturing cost, guaranteed reinforcing effect and the like.

In a broad sense the bolt is made up of a plurality of parts including: 1) the high-strength threaded steel bar is used as a core component of the anchor rod and is pushed into a pre-finished drilled hole in a manual mode; 2) cementing material inclusion such as cement slurry, and the like is injected to the bottom of the drill hole through a grouting pipe, so that the rod body and the peripheral rock-soil body are bonded into a whole; 3) the steel bar connector is used for performing end-to-end connection when the length of the anchor rod exceeds that of a single processed steel bar; 4) centering the bracket to center the steel bar in the drilled hole; 5) the grouting pipe and the exhaust pipe are used for realizing the injection of slurry in the drill hole and the discharge of redundant gas; 6) the anchor rod head and the surface layer are used as an end head resisting body borne by the anchor rod.

The service life of the bolt is dependent on its durability, the greatest threat to which comes from corrosion of the bolt reinforcement. Environmental factors that cause corrosion to the anchor include erosive properties in the rock and soil media and groundwater, bimetallic action, stray currents in the formation, and the like. Under certain conditions, the pH value (PH value), chloride, sulfate and the like in the rock and soil medium can all cause corrosion to the anchoring structure.

As a joint transition layer between the anchor rod and the surrounding rock-soil mass, namely a cement slurry inclusion, the cement slurry inclusion not only forms a load transmission medium of 'formation deformation' → 'anchor rod stress', but also effectively resists the corrosion of the anchor rod, and a high-alkaline environment formed by the cement slurry inclusion can enable the metal surface of the anchor bar to form a stable and compact oxide film to be in a passivation state, thereby having good protection effect on the anchor bar.

Based on the technical scheme, in order to reduce the corrosion of the reinforcing steel bar body of the anchor rod by external media (underground water, air and the like), meet the requirement of the anchor rod on durability within the design service life and ensure the safety and the effectiveness of the anchoring engineering, the thickness of a cement slurry protective layer at the periphery of the reinforcing steel bar body is definitely specified in relevant design and construction specifications of China, interior and exterior (such as European specification BS EN 14490: 2010 "Execution of special cement works. Soil insulation", national standard GB 50086. plus 2015 "technical specification of geotechnical anchor rod and shotcrete supporting engineering" and the like), and the filling continuity, completeness and uniform thickness of the protective layer are ensured.

In order to realize that the thickness of a cement grout inclusion of the anchor rod meets the specification requirement, in the prior anchor rod process, the body of the anchor rod is generally arranged at the center of a drilled hole by arranging a centering bracket at a certain distance (2 m-3 m) along the axis direction of a reinforcing steel bar, so that the peripheral space of the body of the rod (namely the thickness of the later-stage grout inclusion) is controlled. In the actual work progress, traditional stock centering support has following outstanding problem:

1) the centering bracket is generally processed by field workers, the quality is not controllable, and the centering effect is poor

Common centering support divide into two types, generally for temporary batch processing by the workman before the construction of on-the-spot anchor engineering, wherein:

the first method is to use a PVC hard plastic pipe as a raw material, cut a plurality of cuts (3 with circumferential included angle of 120 degrees or 4 with circumferential included angle of 90 degrees) along the axis direction of the pipeline, and force the strips among the cuts of the plastic pipe to form an arch after applying axial pressure.

The second method directly adopts phi 6, phi 8 or other small-diameter round steel bars as raw materials, forms arc-shaped or zigzag-shaped arch after bending by hand or other mechanical methods, then directly welds with the anchor bar steel bars together by electric welding,

for the two centering brackets, the construction methods of different construction units are different in view of the fact that each engineering project has no strict processing control standard, so that the quality of a finished product is uncontrollable. PVC through extrusion centering support, or because of notched length differs, reasons such as position asymmetry, form three or four edges of a wing that highly differ, finally make the stock can't effectively be placed in the middle in the drilling. The problem is more obvious when the centering support is formed by welding, because the round steel bars are processed independently, the arching characteristics of each finished product are possibly different, and when the height of the flange is not obvious, the thickness of a cement slurry protective layer cannot be formed enough at all.

2) The centering bracket is inflexible in installation and unreliable in positioning, and is easy to deviate to influence the centering effect

On one hand, for installing a common PVC rigid plastic centering support, each new one needs to be sleeved from one end of the anchor rod and then pushed to a required position step by step. When the length of the anchor rod is large (such as 9m), a worker needs to walk back and forth to complete the installation of the required number of centering brackets, so that the field operation time is remarkably increased; on the other hand, when the diameter of the anchor rod is close to the inner diameter of the PVC hard plastic pipe used on the site, the situation that the centering support is seriously hindered by the thread of the steel bar and the pushing is not smooth can also occur. At this time, if the centering bracket is pulled forcibly, it is easily deformed or damaged.

On the other hand, the centering bracket should be firmly connected with the anchor rod body, so that when the subsequent anchor rod integral structure is fed into the drilled hole, the arching part of the centering bracket is extruded and rubbed by the hole wall, and the dislocation cannot occur. The PVC rigid plastic centering bracket is fixed on site without any fixing measures and is generally random, and the common form is winding and binding by thin iron wires as shown in figure 4. The problem that adopts above-mentioned ligature to bring is because of its inconvenient operation (the iron wire need shuttle between centering support and the body of rod) for operating efficiency is on the low side, and the ligature effect is also not ideal, and the condition that appears not hard up running position often influences the set distance between each support. When the distance between the adjacent centering brackets is too large, the reinforcing steel bar rod bodies between the adjacent centering brackets form sag under the action of self weight, so that the thickness of the cement slurry protective layer is uneven.

Therefore, it is necessary to develop a simple, practical, efficient and economical multi-petal combined anchor rod centering bracket device.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the shortcomings of the prior art, and providing a multi-petal combined type anchor rod centering support device.

In order to realize the purpose, the technical scheme of the utility model is that: multilobe, can make up formula stock centering support device, its characterized in that: comprises an anchor rod and a centering bracket for wrapping the anchor rod;

the centering struts comprise a first centering strut lobe, a second centering strut lobe, and a centering spine;

the first centering support clack is the same with the second centering support clack in structure, the stock is wrapped by the first centering support clack and the second centering support clack, the left end and the right end of the first centering support clack and the second centering support clack are connected through a fixing device, and two centering ridge frames are arranged in the middle of the first centering support clack and the second centering support clack.

In the above technical solution, the fixing device includes a first buckle tooth located at the upper end of the first pair of middle stent petals, a first buckle door located at the lower end of the first pair of middle stent petals, a second buckle door located at the upper end of the second pair of middle stent petals, and a second buckle tooth located at the lower end of the second pair of middle stent petals; the first buckle tooth is matched with the second buckle door, and the first buckle door is matched with the second buckle tooth.

In the above technical solution, a centering stent flap splicing seam is formed between the first centering stent flap and the second centering stent flap.

In the technical scheme, the left end and the right end of the first centering support clack and the second centering support clack are respectively provided with a binding channel.

In the technical scheme, the left end and the right end of the first middle support petal pair and the second middle support petal pair form a straight channel, and the middle parts of the first middle support petal pair and the second middle support petal pair are concave at the left end and the right end and arched at the middle part.

Compared with the prior art, the utility model has the advantages of it is following:

1) the utility model provides an in the present stock work progress, because traditional centering support is mostly the direct processing of on-the-spot workman and brings production quality uncontrollable, the unable effective problem placed in the middle of stock reinforcing bar has still been solved simultaneously that traditional centering support mounting is inflexible, fix a position the not firm stock structure subassembly installation operating efficiency who brings and hang down, the centering support interval is difficult to the problem that satisfies the engineering requirement.

2) The utility model adopts industrial standard mass production, and has stable and reliable quality; the traditional centering support is influenced by field construction equipment, raw materials, the technical level of workers and the like, and the structural characteristics of the centering support in each batch cannot be guaranteed to be uniform, so that the construction quality of the anchor rod is uneven, and the potential safety hazard of the engineering exists to a certain extent; the utility model discloses the centering support is based on standard model drawing design and industrialization processing in batches, and the main appearance characteristic dimension of centering support has clear and definite requirement, has ensured that the finished product specification is unanimous, the quality is reliable, realizes that the stock is effective placed in the middle.

3) The utility model greatly optimizes the mounting and positioning mode of the centering bracket, reduces the repeated labor and improves the assembly construction efficiency of the anchor rod; the traditional centering bracket can only be sleeved from the end of the anchor rod, and the field repetitive labor is increased along with the increase of the length of the anchor rod; the utility model discloses centering support advantage lies in, can install or separately dismantle at stock arbitrary position lock immediately through "split type opens and shuts + buckle" design at any time, and can not appear because of the problem of unable propelling movement location when centering support internal diameter and bar diameter mismatch. The device greatly reduces the operation difficulty and time of workers, saves the construction period, and is significant for slope emergency and reinforcement engineering.

4) The utility model realizes the firm binding of the centering bracket and the effective centering of the whole length of the anchor rod; the utility model discloses centering support utilizes the push type buckle to tie two lamella supports on the stock body of rod rapidly to further through setting up special channel on the wall edge, twine, ligature and fix through selecting for use thick and solid iron wire or cotton rope, form more effective hoop and tie; compared with the traditional adhesive tape or thin iron wire, the centering bracket can be bound on the anchor rod reinforcing steel bar more efficiently and firmly by random winding, and the effective distance between the centering brackets is ensured. On the basis, the anchor rod can not obviously sag along the whole length, and the uniform thickness of the cement slurry protective layer and the durability of the anchor rod are guaranteed.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a cross-sectional view taken at a-a in fig. 1.

Fig. 3 is a cross-sectional view at B-B in fig. 1.

Fig. 4 is a cross-sectional view at C-C in fig. 1.

Fig. 5 is a cross-sectional view taken at D-D in fig. 1.

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings, which are not intended to limit the present invention, but are merely exemplary. While the advantages of the invention will be apparent and readily appreciated by the description.

With reference to the accompanying drawings: multilobe, can make up formula stock centering support device, its characterized in that: the anchor rod centering device comprises an anchor rod 1 and a centering bracket 2 wrapping the anchor rod 1;

the centering stent 2 comprises a first centering stent petal 21, a second centering stent petal 22 and a centering backbone 23;

the first middle support flap 21 and the second middle support flap 22 have the same structure, the anchor rod 1 is wrapped by the first middle support flap 21 and the second middle support flap 22, the left end and the right end of the first middle support flap 21 and the right end of the second middle support flap 22 are connected through the fixing device 3, and two middle ridge frames 23 are arranged in the middle of the first middle support flap 21 and the middle of the second middle support flap 22.

The fixation device 3 comprises a first latch 211 at the upper end of the first pair of middle stent petals 21, a first latch 212 at the lower end of the first pair of middle stent petals 21, a second latch 222 at the upper end of the second pair of middle stent petals 22, and a second latch 221 at the lower end of the second pair of middle stent petals 22; the first latch 211 is matched with the second latch 222, and the first latch 212 is matched with the second latch 221.

A centering stent flap splice joint 24 is arranged between the first centering stent flap 21 and the second centering stent flap 22.

The left end and the right end of the first middle support flap 21 and the second middle support flap 22 are both provided with a binding channel 25.

The left end and the right end of the first middle support petal 21 and the second middle support petal 22 form a straight path, and the middle parts of the first middle support petal 21 and the second middle support petal 22 are concave at the left end and the right end and arched at the middle part.

The construction method of the multi-petal combined anchor rod centering bracket device is characterized by comprising the following steps of:

step 1: confirming the position, direction, aperture and hole depth of the anchor rod drilling hole according to the requirements of construction drawings, and starting drilling; after drilling is finished, the water pipe extends into the bottom of the hole, and the drilled hole is washed by high-flow water flow;

step 2: preparing anchor rods 1 with different lengths required by anchoring engineering;

and step 3: customizing and processing grinding tools of the first middle support flap 21 and the second middle support flap 22, and carrying out standardized mass production in a workshop;

and 4, step 4: preliminarily and relatively attaching the first pair of middle stent petals 21 and the second pair of middle stent petals 22 to the anchor rod 1 along the middle stent petal splicing seams 24;

and 5: the first buckle teeth 211 are combined by pressing and then penetrate out of the second buckle door 222, and the first buckle teeth 211 are naturally separated towards two sides and hung on the second buckle door 222 after the pressing force is released; the second buckle teeth 221 are combined by pressing and penetrate out of the first buckle door 212, and the second buckle teeth 221 are naturally separated towards two sides and hung on the first buckle door 212 after the pressing force is released;

step 6: iron wires or ropes are used for winding and binding and firmly binding in the binding channels 25 at the left end and the right end of the first centering bracket petal 21 and the second centering bracket petal 22, and the installation and the positioning of the single centering bracket 2 on the anchor rod 1 are completed;

and 7: arranging and fixing a grouting pipe and an exhaust pipe on the body of the anchor rod 1;

and 8: the anchor rod 1 is integrally sent into a drilled hole, pushing is carried out in a manual mode, and the slow constant-speed pushing speed is kept in the whole process so as to ensure that materials of all parts of the anchor rod 1 are not deformed and damaged after extrusion, friction and the like;

and step 9: and after the anchor rod 1 is installed, grouting is carried out from the bottom of the hole by utilizing a grouting pipe hole, along with the rising of the liquid level of the grout, residual gas in the drilled hole is discharged through the exhaust pipe, and finally the grout reaches the hole opening to complete hole sealing and complete construction.

In practical use, the centering ridge 23 is used for centering the anchor rod 1 in a drilled hole, so that the disadvantage that cement grout on one side of a reinforcing steel bar of the anchor rod 1 is too thin is prevented; using the gates and teeth in pairs to achieve a combined splice of the first and second centering stent petals 21 and 22; the binding channels 25 at the left end and the right end are used for placing iron wires or ropes, so that the combined first pair of middle bracket flaps 21 and the second pair of middle bracket flaps 22 are further firmly bound and fixed on the rod body of the anchor rod 1.

The utility model discloses the former material that centering support 2 is used for processing is PVC rigid plastic, and the size that first centering support lamella 21 and second centering support lamella 22 make up into after whole through the buckle is 160mm (axial length) × 35mm (minimum internal diameter) × 25mm (centering ridge 23 maximum height of arching mutually), specifically can adjust according to 1 reinforcing bar external diameter of actual stock and the drilling internal diameter that is used for. The tube wall thickness at each location is typically 4 mm.

The first and second fastening doors 212 and 222 are integrally formed with the centering bracket 2, the first and second fastening doors 212 and 222 are flat U-shaped frames with the thickness of 4mm, and the clear space in the frames is 6mm × 12mm (height × width) and is used as an occlusion channel for subsequent assembly of the first and second centering bracket flaps 21 and 22;

the first buckle tooth 211 and the second buckle tooth 221 are integrally formed with the centering support 2, the root of the buckle tooth (the joint with the centering support 2) is 8mm wide, the width of the buckle tooth is gradually increased to 12mm along the direction which is 20 degrees from the circumferential tangential direction of the centering support 2, then the buckle tooth is divided into two parts after a narrow slit with the width of about 3mm is cut in the middle part, a pair of small buckle teeth are formed, the size of each buckle tooth is 7mm multiplied by 4mm (width multiplied by height), and the narrow slit is used as a space for pressing the pair of buckle teeth towards the middle part.

The binding channel 25 is arranged at the 10mm-20mm positions of the left end and the right end of the centering bracket 2, the depth is 2mm, and the width can be properly increased on the basis of 3mm so as to adapt to thick and solid binding ropes and the like.

Other parts not described belong to the prior art.

Claims (5)

1. Multilobe, can make up formula stock centering support device, its characterized in that: comprises an anchor rod (1) and a centering bracket (2) wrapping the anchor rod (1);

the centering stent (2) comprises a first centering stent flap (21), a second centering stent flap (22) and a centering spine (23);

the first middle support valve (21) and the second middle support valve (22) are identical in structure, the anchor rod (1) is wrapped by the first middle support valve (21) and the second middle support valve (22), the left end and the right end of the first middle support valve (21) and the second middle support valve (22) are connected through the fixing device (3), and two centering ridge frames (23) are arranged in the middle of the first middle support valve (21) and the second middle support valve (22).

2. The multi-lobed assemblable rock bolt centering bracket device of claim 1, wherein: the fixing device (3) comprises a first buckle tooth (211) positioned at the upper end of the first middle support flap (21), a first buckle door (212) positioned at the lower end of the first middle support flap (21), a second buckle door (222) positioned at the upper end of the second middle support flap (22), and a second buckle tooth (221) positioned at the lower end of the second middle support flap (22); the first buckle tooth (211) is matched with the second buckle door (222), and the first buckle door (212) is matched with the second buckle tooth (221).

3. The multi-lobed assemblable rock bolt centering bracket device of claim 1, wherein: and a centering stent flap splicing seam (24) is arranged between the first centering stent flap (21) and the second centering stent flap (22).

4. The multi-lobed assemblable rock bolt centering bracket device of claim 3, wherein: and binding channels (25) are arranged at the left end and the right end of the first centering support flap (21) and the second centering support flap (22).

5. The multi-lobed assemblable rock bolt centering bracket device of claim 4, wherein: the left end and the right end of the first middle support valve pair (21) and the second middle support valve pair (22) form a straight channel, and the middle parts of the first middle support valve pair (21) and the second middle support valve pair (22) are concave at the left end and the right end and arched at the middle part.

Images