CN203559908U - Supporting structure for roadway baseplate - Google Patents
Supporting structure for roadway baseplate Download PDFInfo
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- CN203559908U CN203559908U CN201320653874.8U CN201320653874U CN203559908U CN 203559908 U CN203559908 U CN 203559908U CN 201320653874 U CN201320653874 U CN 201320653874U CN 203559908 U CN203559908 U CN 203559908U
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- pressure relief
- roadway
- grouting
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- anchor cable
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Abstract
The utility model provides a supporting structure for a roadway baseplate. A grouting reinforcement layer is arranged under the roadway baseplate, a plurality of pressure relief holes are formed in the grouting reinforcement layer, anchor members are arranged below the pressure relief holes, anchor ropes are fixed on the anchor members, penetrate through cover plates and are fixed on a steel beam used for pressing on a plurality of cover plates, and a lock used for tensioning the anchor ropes is arranged on the steel beam. According to the supporting structure, the pressure relief holes reserve deformation space for the roadway baseplate, so that stress of the roadway baseplate is transferred to a deep position, and maintenance of the shallow stratum of the roadway baseplate is facilitated; and at the same time, the anchor members are located at the stratum deep part with higher stability, the grouting reinforcement layer formed by shallow surrounding rock is connected with the anchor members by the anchor ropes, so that deformation of the shallow surrounding rock of the roadway baseplate is effectively restrained. In addition, the plurality of pressure relief holes and anchor ropes are integrally connected by the steel beam, so that the integral supporting structure is formed, and the supporting structure for the roadway baseplate is more stable.
Description
Technical field
The utility model relates to base plate improvement technology in Soft Rock Drifts At Coal, relates in particular to a kind of roadway floor supporting and protection structure, belongs to coal mine roadway technical field of construction.
Background technology
Pressure soft rock tunnel, deep-well highland, when being subject to dynamic pressure and affecting, because roadway floor is often ignored by ore deposit side when the driving, does not reinforce roadway floor or fastening strength is starkly lower than back, portion of side.When being subject to dynamic pressure in tunnel and affecting, roadway floor often becomes the region of whole unloading blast, therefore, roadway floor is out of shape relative back and portion of side is the most serious, cause the equipment such as part track and sealing-tape machine normally to use, affect mining area production and construction, when serious, even cause mining area to stop production.
In prior art, general employing carried out strong reinforcing to base plate and administered pucking, as adopts the structures such as totally-enclosed support, arch of the anti-end, the full anchor reinforcing of anchor cable.This structure is pressed in basal bed, tunnel when little can suppress roadway deformation, plays good supporting effect; But under the pressure soft rock environment of deep-well highland, press greatly in tunnel, this strong base plate supporting and protection structure cannot resist to press, and tends to cause base plate supporting and protection structure to heave or perk in practice, and coal seam floor failure was lost efficacy, thereby affects the use in tunnel.
In prior art, another kind of method is to adopt the base plate modes such as indent of starting discharging to shift base sheet stresses, thereby administers pucking.And adopt merely the base plate methods such as indent of starting discharging, although can be by stress transfer the deep to floor strata, because base plate top layer does not have active support structure, roadway floor surface also there will be moderate finite deformation; And digging pressure relief groove cost is higher, construction takes up room greatly, difficulty is large, very easily affects tunnel and normally uses.
Utility model content
For solving the technical problem that in prior art, roadway floor easily deforms, the purpose of this utility model is to provide a kind of roadway floor supporting and protection structure, and the rock stratum for supported laneway bottom, comprising:
Be arranged on the grouting and reinforcing layer in described rock stratum, be positioned under the plane of bottom, described tunnel;
A plurality of pressure relief vents, described in each, pressure relief vent all vertically also extends described grouting and reinforcing layer bottom downwards through described grouting and reinforcing layer;
A plurality of anchoring bodys, described in each, anchoring body is arranged at the below of described pressure relief vent;
A plurality of cover plates, described cover plate covers the top of pressure relief vent described in each;
For pressing the girder steel of putting on a plurality of described cover plates;
For connecting the anchor cable of described girder steel and described anchoring body;
The lockset carrying out for anchor cable described in tensioning, is arranged on described girder steel.
Roadway floor supporting and protection structure as above, wherein, described supporting and protection structure also comprises:
Be arranged at the concrete mortar layer on described grouting and reinforcing layer, be positioned under described cover plate;
For covering the concrete strengthening layer of described girder steel, described lockset and described cover plate, be arranged on described concrete mortar layer.
Roadway floor supporting and protection structure as above, wherein, is also provided with one deck steel mesh reinforcement in described concrete strengthening layer, and described steel mesh reinforcement is between described pressure relief vent top and described cover plate.
Roadway floor supporting and protection structure as above, wherein, the thickness of described concrete strengthening layer is 200-300mm; The thickness of described concrete mortar layer is 100-150mm.
Roadway floor supporting and protection structure as above, wherein, the thickness of described grouting and reinforcing layer is 1.5-2m; The aperture of described pressure relief vent is 80-100mm, and hole depth is 3-3.5m; Described cover plate adopts steel plate, and described steel plate is not less than 400 * 400mm; Described anchor cable is steel strand, and described steel strand diameter is 20-30mm, and length is 5-7m.
Another object of the present utility model is to provide a kind of construction method of roadway floor supporting and protection structure, comprises the steps:
A plurality of pressure relief vents that vertically spud on the grouting and reinforcing layer that step 20. forms in step 10, the hole depth of each pressure relief vent is at least extended the bottom surface of grouting and reinforcing layer; Then the anchor cable hole that spuds in the bottom of each pressure relief vent, is placed in anchor cable behind each anchor cable hole bottom, then cement list slurries is injected in anchor cable hole, treats that anchor cable hole bottom forms the anchoring body that connects anchor cable around;
Step 30. covers the top of each pressure relief vent in step 20 with cover plate, then with girder steel, a plurality of cover plates is pushed down, and then the free end of every anchor cable is connected on girder steel through cover plate, finally with lockset, the anchor cable after tensioning is locked on girder steel.
The construction method of roadway floor supporting and protection structure as above, wherein, in described step 10, first, at the rock layer surface sprayed mortar mortar of bottom, tunnel, forms concrete mortar layer, and injected hole then spuds on concrete mortar layer;
The construction method of described roadway floor supporting and protection structure also comprises:
Step 40., after the lockset locking anchor cable of step 30, is built one deck concrete strengthening layer on concrete mortar layer, and lockset, girder steel in the concrete mortar layer in step 10 and step 30 are all covered.
The construction method of roadway floor supporting and protection structure as above, wherein, in described step 30, before cover plate covers the top of each pressure relief vent, lays one deck steel mesh reinforcement at the end face of pressure relief vent.
The construction method of roadway floor supporting and protection structure as above wherein, in described step 30, is 100-120kN for the pretightning force size of tensioning anchor cable.
The construction method of roadway floor supporting and protection structure as above, wherein, in described step 10: the hole depth of injected hole is 1.5-1.8m, in cement list slurries, the quality proportioning of cement and water is 1.4:1, grouting pressure is 2-3MPa; In described step 20: described anchor cable hole diameter is 30-38mm; In cement list slurries, the quality proportioning of cement and water is 1.4:1; The degree of depth of described anchor cable hole is 2-3.5m; In described step 40, the composition proportion of concrete strengthening layer before building be, cement: sand: stone: water=1.33:3.97:6.83:1.
Roadway floor supporting and protection structure of the present utility model, pressure relief vent is wherein that deformation space has been reserved in roadway floor distortion, and roadway floor stress is shifted to depths, contributes to roadway floor superficial part rock stratum to safeguard; And anchoring body is positioned at deep, roadway floor rock stratum, stability is higher; Meanwhile, grouting and reinforcing layer and anchoring body that anchor cable forms superficial part country rock link together, and have effectively contained the distortion of roadway floor superficial part country rock.In addition, the girder steel in the utility model is connected to an integral body by a plurality of pressure relief vents and a plurality of anchor cable, has formed integer support structure, makes roadway floor supporting and protection structure of the present utility model more firm.
Accompanying drawing explanation
Fig. 1 is the roadway floor supporting and protection structure schematic diagram of the utility model embodiment.
The specific embodiment
Fig. 1 is the roadway floor supporting and protection structure schematic diagram of the utility model embodiment, the roadway floor supporting and protection structure of the present embodiment, operated by rotary motion is in bottom, tunnel, for supporting is carried out in the rock stratum of bottom, tunnel, the supporting and protection structure of the present embodiment comprises: grouting and reinforcing layer 9, a plurality of pressure relief vent 6, a plurality of anchoring body 7, girder steel 11, anchor cable 1 and lockset 3.
Grouting and reinforcing layer 9 is positioned at the rock stratum under tunnel base plane 13; Grouting and reinforcing layer 9 has been reinforced the stability of roadway floor superficial part country rock, has prevented that superficial part country rock from occurring local subsidence or being caving phenomenon in applying pretightning force process at construction drill, to anchor cable, and to Floor Heave in Roadway, certain containment effect has also been played in distortion; On grouting and reinforcing layer 9, offer a plurality of pressure relief vents 6, the bottom that each pressure relief vent 6 all vertically also extends grouting and reinforcing layer 9 downwards through grouting and reinforcing layer 9; The below of each pressure relief vent 6 is provided with an anchoring body 7, and the top of each pressure relief vent 6 is coated with cover plate 2, and cover plate 2 is positioned on concrete mortar layer 12, for covering the top of pressure relief vent 6; Cover plate 2 is arranged in concrete strengthening layer 10; On a plurality of cover plates 2, press and be equipped with girder steel 11.
Anchor cable 1 is for connecting girder steel 11 and anchoring body 7, and one end of anchor cable 1 is fixed in anchoring body 7, and the other end of anchor cable 1 is connected on girder steel 11 through cover plate 2; On girder steel 11, be provided with lockset 3, lockset 3 is for carrying out pretension to anchor cable 1, makes anchor cable 1 between anchoring body 7 and girder steel 11 in tensioning state.
In embodiment of the present utility model, grouting and reinforcing layer 9, pressure relief vent 6 and anchoring body 7 are all arranged in the rock stratum under tunnel base plane 13.
In the present embodiment, pressure relief vent 6 makes roadway floor stress shift to depths, for roadway floor distortion, has reserved deformation space, contributes to roadway floor superficial part rock stratum to safeguard; And the strata structure in roadway floor deep that is provided with anchoring body 7 is complete, in three-dimensional stress state, is easy to form self-stabilization structure; Simultaneously, anchor cable 1 links together the superficial part country rock (being grouting and reinforcing layer 9) after reinforcing by cover plate 2 and girder steel 11 with deep stabilizing surrounding rock, effectively contained the distortion of roadway floor superficial part country rock, and then effectively controlled roadway floor distortion, for the normal use in tunnel provides guarantee.
On the basis of above-described embodiment, the supporting and protection structure of the present embodiment also comprises concrete strengthening layer 10 and concrete mortar layer 12.Concrete mortar layer 12 is arranged on grouting and reinforcing layer 9, is positioned under cover plate 2; Concrete strengthening layer 10 is arranged on concrete mortar layer 12, for covering girder steel 11, lockset 3 and cover plate 2.Because the girder steel 11 of the utility model embodiment is within concrete strengthening layer 10, the below of girder steel 11 is disposed with again cover plate 2, concrete mortar layer 12 and grouting and reinforcing layer 9, the phenomenon having lost efficacy with regard to having prevented girder steel 11 from occurring torsional deformation in anchor cable 1 end like this, girder steel 11 is connected to an integral body by a plurality of pressure relief vents 6, a plurality of anchor cable 1 simultaneously, formed integer support structure, made roadway floor supporting and protection structure of the present utility model more firm.
On the basis of above-described embodiment, further, concrete strengthening layer 10 is interior can also arrange one deck steel mesh reinforcement 5, and steel mesh reinforcement 5 is between the top and cover plate 2 of pressure relief vent 6.The steel mesh reinforcement 5 concrete strengthening layer 10 that not only can better bond, and be arranged between the top and cover plate 2 of pressure relief vent 6, the stress diffusion that can also well anchor cable 1 be subject to is come and is passed on whole grouting and reinforcing layer 9.
The further scheme of the utility model embodiment is that the thickness a of concrete strengthening layer 10 is generally 200-300mm; The thickness b of concrete mortar layer 12 is generally 100-150mm; The thickness of grouting and reinforcing layer 9 is generally 1.5-2m, and the degree of depth is 1.5-2m; The aperture R of pressure relief vent 6 is 80-100mm, and hole depth c is 3-3.5m; The general steel plate that adopts of cover plate 2, the size of steel plate is generally not less than 400 * 400mm.The general steel strand that adopt of anchor cable 1, steel strand diameter is generally 20-30mm, and length is 5-7m.The thickness of concrete strengthening layer 10, concrete mortar layer 12 and grouting and reinforcing layer 9, and the aperture of pressure relief vent 6 and hole depth, the length of anchor cable 1 and the size of diameter and cover plate 2, they determine according to the concrete condition of roadway floor rock stratum by concrete numerical value, as softer in rock stratum or stress is higher, the size of thickness and the degree of depth all will increase.In addition, as Fig. 1, the general i iron that adopts of girder steel 11, during use, i iron is horizontal on cover plate 2.
The utility model embodiment also provides a kind of construction method of roadway floor supporting and protection structure, specifically comprises the steps:
A plurality of pressure relief vents 6 that vertically spud on the grouting and reinforcing layer 9 that step 20. forms in step 10, the hole depth c of each pressure relief vent 6 at least extends the bottom surface of grouting and reinforcing layer 9; Then the anchor cable hole 8 that spuds in the bottom of each pressure relief vent 6, is placed in anchor cable 1 behind each anchor cable hole 8 bottom, then cement list slurries is injected in anchor cable hole 8, treats that anchor cable hole 8 bottoms form the anchoring body 7 that connects anchor cable 1 around;
Step 30. covers the top of each pressure relief vent 6 in step 20 with cover plate 2, with girder steel 11, a plurality of cover plates 2 are pushed down again, then the free end of every anchor cable 1 (being non-one end being connected with anchoring body) is connected on girder steel 11 through cover plate 2, every anchor cable 1 is applied to pretightning force, finally with lockset 3, the anchor cable 1 after tensioning is locked on girder steel 11.
On the basis of above-described embodiment, in step 10, first, at rock layer surface (being tunnel base plane 13) the sprayed mortar mortar of bottom, tunnel, form concrete mortar layer 12, injected hole 4 then spuds on concrete mortar layer 12; Can also be in the rear increase of step 30 step 40, the particular content of step 40 is: after the lockset 3 locking anchor cables 1 of step 30, on concrete mortar layer 12, build a layer concrete and form concrete strengthening layer 10, the lockset 3 in the concrete mortar layer 12 in step 10 and step 30, girder steel 11 are all covered.
Wherein, in the embodiment of the construction method of above-mentioned roadway floor supporting and protection structure, further, in step 30, before cover plate 2 covers the top of each pressure relief vent 5, at the end face of pressure relief vent 5, lay one deck steel mesh reinforcement 5.Steel mesh reinforcement 5, after concrete strengthening layer 10 has been built, not only can improve the intensity of concrete strengthening layer 10, and the stress diffusion that can also well anchor cable 1 be subject to is come and is passed on whole grouting and reinforcing layer 9.
On the basis of the embodiment of the construction method of above-mentioned roadway floor supporting and protection structure, wherein, in step 30, for the pretightning force size of tensioning anchor cable, be 100-120kN, the pretightning force size every anchor cable being applied is generally 100-120kN.If constructed in having the rock stratum of higher stress, the diameter of pretightning force size and anchor cable all needs to increase.
In addition, under general execution conditions, in step 10: water in concrete mortar: cement: the ratio of sand is 1:2.5:4; The hole depth of injected hole is generally 1.5-1.8m, and in cement list slurries, the quality proportioning of cement and water is 1.4:1, and grouting pressure is 2-3MPa.In step 20: described anchor cable hole diameter r is for being generally 30-38mm, and the diameter r of anchor cable hole is generally slightly larger than the diameter of anchor cable 1; In cement list slurries, the quality proportioning of cement and water is 1.4:1; The depth d of anchor cable hole 8 is 2-3.5m, and the bottom of pressure relief vent 6 is 2-3.5m to the height of anchor cable hole 8 bottoms.Cement single-blade liquid in step 10 and step 20 can be identical, and cement grade and ratio are selected according to geological conditions, generally adopt 425# Portland cement.Equally, in step 40, the composition proportion of concrete strengthening layer 10 before building be, cement: sand: stone: water=1.33:3.97:6.83:1; Concrete strengthening layer 10 also can adopt commercial concrete or the label concrete more than C20 to build.
Adopt the construction method of the utility model roadway floor supporting and protection structure to have the following advantages:
(1) adopt and open pressure relief vent release at grouting and reinforcing layer, perforate easily can reach darker rock stratum, and the larger workload of having avoided excavation pressure relief groove to produce;
(2) Shallow hole grouting makes roadway floor superficial part country rock form grouting and reinforcing layer, improved the stability of shallow-layer country rock, prevented that superficial part country rock from occurring local subsidence or being caving phenomenon in applying pretightning force process at construction drill, to anchor cable, to Floor Heave in Roadway, certain containment effect has also been played in distortion;
(3) pressure relief vent is that roadway floor distortion leaves deformation space in advance, and roadway floor stress is shifted to depths, contribute to roadway floor superficial part rock stratum to safeguard, and roadway floor deep strata structure is complete, is easy to form self-stabilization structure; Anchor cable links together superficial part country rock and deep stabilizing surrounding rock after reinforcing simultaneously, has effectively contained the distortion of roadway floor superficial part country rock;
(4) girder steel is connected to an integral body by a plurality of pressure relief vents and a plurality of anchor cable, has formed integer support structure, even if some of pressure relief vent or failure of cable do not affect the stability of whole supporting and protection structure yet.
Finally it should be noted that: each embodiment, only in order to the technical solution of the utility model to be described, is not intended to limit above; Although the utility model is had been described in detail with reference to aforementioned each embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or some or all of technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the scope of each embodiment technical scheme of the utility model.
Claims (5)
1. a roadway floor supporting and protection structure, the rock stratum for supported laneway bottom, is characterized in that, comprising:
Be arranged on the grouting and reinforcing layer in described rock stratum, be positioned under the plane of bottom, described tunnel;
A plurality of pressure relief vents, described in each, pressure relief vent all vertically also extends described grouting and reinforcing layer bottom downwards through described grouting and reinforcing layer;
A plurality of anchoring bodys, described in each, anchoring body is arranged at the below of described pressure relief vent;
A plurality of cover plates, described cover plate covers the top of pressure relief vent described in each;
For pressing the girder steel of putting on a plurality of described cover plates;
For connecting the anchor cable of described girder steel and described anchoring body;
The lockset carrying out for anchor cable described in tensioning, is arranged on described girder steel.
2. roadway floor supporting and protection structure according to claim 1, is characterized in that, described supporting and protection structure also comprises:
Be arranged at the concrete mortar layer on described grouting and reinforcing layer, be positioned under described cover plate;
For covering the concrete strengthening layer of described girder steel, described lockset and described cover plate, be arranged on described concrete mortar layer.
3. roadway floor supporting and protection structure according to claim 2, is characterized in that, in described concrete strengthening layer, is also provided with one deck steel mesh reinforcement, and described steel mesh reinforcement is between described pressure relief vent top and described cover plate.
4. according to the roadway floor supporting and protection structure described in claim 2 or 3, it is characterized in that, the thickness of described concrete strengthening layer is 200-300mm; The thickness of described concrete mortar layer is 100-150mm.
5. according to the arbitrary described roadway floor supporting and protection structure of claim 1-3, it is characterized in that, the thickness of described grouting and reinforcing layer is 1.5-2m; The aperture of described pressure relief vent is 80-100mm, and hole depth is 3-3.5m; Described cover plate adopts steel plate, and described steel plate is not less than 400 * 400mm; Described anchor cable is steel strand, and described steel strand diameter is 20-30mm, and length is 5-7m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320653874.8U CN203559908U (en) | 2013-10-22 | 2013-10-22 | Supporting structure for roadway baseplate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320653874.8U CN203559908U (en) | 2013-10-22 | 2013-10-22 | Supporting structure for roadway baseplate |
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| CN203559908U true CN203559908U (en) | 2014-04-23 |
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| CN201320653874.8U Expired - Lifetime CN203559908U (en) | 2013-10-22 | 2013-10-22 | Supporting structure for roadway baseplate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103670444A (en) * | 2013-10-22 | 2014-03-26 | 淮南矿业(集团)有限责任公司 | Roadway bottom plate supporting structure and construction method thereof |
-
2013
- 2013-10-22 CN CN201320653874.8U patent/CN203559908U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103670444A (en) * | 2013-10-22 | 2014-03-26 | 淮南矿业(集团)有限责任公司 | Roadway bottom plate supporting structure and construction method thereof |
| CN103670444B (en) * | 2013-10-22 | 2015-11-04 | 淮南矿业(集团)有限责任公司 | Roadway floor supporting and protection structure and construction method thereof |
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