CN109681237B - Supporting structure and construction method for floor heave of soft rock roadway - Google Patents
Supporting structure and construction method for floor heave of soft rock roadway Download PDFInfo
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- CN109681237B CN109681237B CN201811577432.3A CN201811577432A CN109681237B CN 109681237 B CN109681237 B CN 109681237B CN 201811577432 A CN201811577432 A CN 201811577432A CN 109681237 B CN109681237 B CN 109681237B
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- 239000011435 rock Substances 0.000 title claims abstract description 40
- 238000010276 construction Methods 0.000 title claims abstract description 17
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 359
- 239000010959 steel Substances 0.000 claims abstract description 359
- 238000005266 casting Methods 0.000 claims abstract description 12
- 238000005553 drilling Methods 0.000 claims description 5
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- 239000003245 coal Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005065 mining Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000003139 buffering effect Effects 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/107—Reinforcing elements therefor; Holders for the reinforcing elements
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
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Abstract
The invention discloses a supporting structure and a construction method for floor heave of a soft rock roadway, which comprise the following steps: frame portion and a plurality of stock. The frame portion includes: the pressing device comprises a first channel steel, a second channel steel, a first pressing piece, a second pressing piece, a plurality of central connecting pieces and a third channel steel. The first channel steel and the second channel steel are arranged in parallel. The central connecting piece is arranged between the first channel steel and the second channel steel and is positioned below the horizontal planes where the first channel steel and the second channel steel are positioned. And a third channel steel is connected between every two adjacent central connecting pieces. The first yielding piece comprises a first horizontal section channel steel, a first oblique channel steel and a second oblique channel steel; the second yielding piece comprises a second horizontal section channel steel, a third oblique channel steel and a fourth oblique channel steel. The stock is located the bottom side of frame portion. Through adopting central connecting plate, first letting casting die and second to let the casting die in supporting construction, but increased integrated configuration's area of strutting has changed the unable condition of strutting the big section tunnel of traditional steel bow member structure.
Description
Technical Field
The invention belongs to the technical field of roadway support, and particularly relates to a supporting structure and a construction method for floor heave of a soft rock roadway.
Background
With the progress of coal mining technology, the depth of coal mining in China is gradually increased, however, the geological conditions in deep wells and coal mines are very complex, high risks are brought to normal mining of coal mines, floor heave phenomena of roadways are very serious under the action of high ground stress, the supporting difficulty of the roadways is invisibly increased, even after supporting is completed, the probability of later maintenance is very high, and the cost of coal mining is greatly increased. The expansive soft rock is one of the representatives, and the floor heave is larger when the expansive soft rock roadway is deformed more obviously than other types of soft rock roadways. Therefore, the floor heave phenomenon of the expansive soft rock is just the main cause of roadway damage.
In the existing floor heave treatment scheme, methods such as setting a floor anchor rod and a floor angle anchor rod, arranging a pressure relief groove, grouting and reinforcing, setting a floor concrete reverse arch, arranging a metal net rack and a section steel support and the like are generally adopted. However, due to the large ground stress in deep roadways, the expected effect cannot be achieved by a single supporting method.
Disclosure of Invention
The invention aims to solve the technical problem of providing a supporting structure and a construction method for floor heave of a soft rock roadway, increasing the supportable area of a combined structure and solving the problem that a large-section roadway cannot be supported by a traditional steel arch frame structure.
In order to solve the problems, the technical scheme of the invention is as follows:
the invention relates to a supporting structure for floor heave of a soft rock roadway, which comprises: the frame part and a plurality of anchor rods;
the frame portion includes: the pressing device comprises a first channel steel, a second channel steel, a first pressing piece, a second pressing piece, a plurality of central connecting pieces and a third channel steel;
the first channel steel and the second channel steel are arranged in parallel;
the central connecting piece is arranged between the first channel steel and the second channel steel and is positioned below the horizontal plane where the first channel steel and the second channel steel are positioned;
the third channel steel is connected between every two adjacent central connecting pieces;
the first yielding piece comprises a first horizontal section channel steel, a first oblique channel steel and a second oblique channel steel;
a first end of the first horizontal section of channel steel is fixedly connected with the first channel steel, and a first end of the first oblique channel steel and a first end of the second oblique channel steel are fixedly connected with a second end of the first horizontal section of channel steel; the first oblique channel steel and the second oblique channel steel respectively correspond to two adjacent central connecting pieces, the second end of the first oblique channel steel is fixedly connected with the corresponding central connecting piece, and the second end of the second oblique channel steel is fixedly connected with the corresponding central connecting piece;
the second yielding piece comprises a second horizontal section channel steel, a third oblique channel steel and a fourth oblique channel steel;
the first end of the second horizontal section of channel steel is fixedly connected with the second channel steel, and the first end of the third oblique channel steel and the first end of the fourth oblique channel steel are fixedly connected with the second end of the second horizontal section of channel steel; the third oblique channel steel and the fourth oblique channel steel respectively correspond to two adjacent central connecting pieces, a second end of the third oblique channel steel is fixedly connected with the corresponding central connecting piece, and a second end of the fourth oblique channel steel is fixedly connected with the corresponding central connecting piece;
the anchor rod is arranged on the bottom side of the frame portion.
According to the supporting structure for the floor heave of the soft rock roadway, the first yielding piece further comprises a first channel steel sleeve, and the first channel steel sleeve is connected with the first channel steel and the first horizontal section channel steel respectively; the second lets the casting die still includes the second channel-section steel bushing, the second channel-section steel bushing respectively with the second channel-section steel with the second horizontal segment channel-section steel links to each other.
The invention relates to a supporting structure of floor heave of a soft rock roadway,
a first closed cover plate is welded at the head end of the first horizontal section channel steel;
corresponding bolt grooves are formed in the first groove steel sleeve and the first horizontal section channel steel;
two steel bars are welded on the top surface of the first channel steel sleeve connected with the first horizontal section channel steel, threads are machined on the end parts of the steel bars, which are far away from the top surface of the first channel steel sleeve, and springs are sleeved on the steel bars;
the steel bar penetrates through the first closed cover plate and limits the first horizontal section channel steel through a bolt;
the first channel steel sleeve is connected with the first horizontal section channel steel through bolts of corresponding bolt grooves;
a second closed cover plate is welded on the upper part of the first channel steel sleeve;
a third closed cover plate is welded at the head end of the second horizontal section channel steel;
corresponding bolt grooves are formed in the second groove steel sleeve and the second horizontal section channel steel;
two steel bars are welded on the top surface of the second channel steel sleeve connected with the second horizontal section channel steel, threads are machined on the end parts of the steel bars, which are far away from the top surface of the second channel steel sleeve, and springs are sleeved on the steel bars;
the steel bar penetrates through the third closed cover plate and limits the second horizontal section channel steel through a bolt;
the second channel steel sleeve is connected with the second horizontal section channel steel through bolts of corresponding bolt grooves;
and a fourth closed cover plate is welded on the upper part of the second channel steel sleeve.
According to the supporting structure for the floor heave of the soft rock roadway, the central connecting piece comprises an upper sleeve plate and a lower sleeve plate, and the upper sleeve plate and the lower sleeve plate are matched to form six slotted steel sleeves.
According to the supporting structure for the floor heave of the soft rock roadway, the anchor rods are respectively arranged on the bottom side of the first channel steel, the bottom side of the second channel steel, the bottom side of the central connecting piece, the bottom side of the first oblique channel steel, the bottom side of the second oblique channel steel, the bottom side of the third oblique channel steel and the bottom side of the fourth oblique channel steel.
The invention discloses a construction method of a supporting structure of floor heave of a soft rock roadway, which comprises the following steps:
s1: digging a bottom plate on the bottom plate of the roadway along the length direction of the roadway to enable the bottom plate to be arc-shaped, paving a layer of concrete on the dug bottom arch, and paving a layer of anchor net on the bottom along the length direction in advance;
s2: laying the frame section;
s3: arranging the anchor rod at the bottom of the frame part;
s4: concrete is filled in the supporting structure, so that an arc-shaped inverted bottom arch along the length direction of the roadway is formed on the upper surface and the lower surface of the channel steel, finally, a layer of anchor net is paved on the upper portion, concrete is poured after the combined structure is completely installed in place, all the structures are covered by the concrete, and meanwhile, the concrete exceeds the original bottom plate position by 10-20 cm.
According to the construction method of the supporting structure of the floor heave of the soft rock roadway, in the step S1, the downward digging depth of the middle point of the cross section of the roadway along the length direction of the roadway is 100-120 cm, and horizontal sections for placing the first channel steel and the second channel steel are reserved on the left side and the right side of the width direction of the roadway.
According to the construction method of the supporting structure of the floor heave of the soft rock roadway, in the step S3, the anchor rod which is vertically downward is drilled on the central connecting piece through the reserved anchor rod hole; drilling the anchor rods which form an included angle of 45 degrees with the vertical direction through reserved anchor rod holes on the first channel steel and the second channel steel; and drilling the anchor rods which form an included angle of 30 degrees with the vertical direction through reserved anchor rod holes at the bottom sides of the first oblique channel steel, the second oblique channel steel, the third oblique channel steel and the fourth oblique channel steel.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects:
1) in an embodiment of the invention, a central connecting piece, a first yielding piece and a second yielding piece are adopted in a supporting structure, the central connecting piece is arranged below horizontal planes of a first channel steel and a second channel steel, the first yielding piece comprises a first horizontal section channel steel, a first oblique channel steel and a second oblique channel steel, the first horizontal section channel steel is connected with the first channel steel, the first oblique channel steel and the second oblique channel steel are respectively connected with adjacent central connecting pieces, the second yielding piece comprises a second horizontal section channel steel, a third oblique channel steel and a fourth oblique channel steel, the second horizontal section channel steel is connected with the second channel steel, the third oblique channel steel and the fourth oblique channel steel are respectively connected with adjacent central connecting pieces, the supportable area of the combined structure is increased by the connecting mode, and the situation that a large-section roadway cannot be supported by a traditional steel arch frame structure is changed.
2) In one embodiment of the invention, after concrete is integrally poured, the whole inverted arch arc plate is integrated due to two layers of anchor nets on the upper surface and the lower surface of the steel frame, upward stress of the vertical bottom plate is firstly controlled by the anchor rods to be a part, then the residual stress is dispersed by the arc inverted arch shell along the surface of the shell, and finally the residual stress is transmitted to the upper part along the plate surface and then is further decomposed by the first pressure-releasing piece and the second pressure-releasing piece arranged on the upper part, so that the pressure relief effect of the traditional pressure relief groove is achieved.
3) In one embodiment of the invention, the bottom of the roadway is in a U shape of an inverted bottom arch, the direction of a force system is changed, vertical stress is converted into other directions, and the stress is further transferred and released by combining a pressure relief structure of the roadway side part.
Drawings
Fig. 1 is a schematic three-dimensional structure diagram of a supporting structure of a soft rock roadway floor heave of the invention;
FIG. 2 is a schematic plane structure diagram of a supporting structure of the soft rock roadway floor heave of the invention;
FIG. 3 is a yielding component diagram of the supporting structure for the floor heave of the soft rock roadway;
FIG. 4 is a schematic structural view of a central connecting piece of the supporting structure of the floor heave of the soft rock roadway;
FIG. 5 is a schematic view of herringbone channel steel of the supporting structure for the floor heave of the soft rock roadway;
FIG. 6 is a schematic view of a central connecting piece of the supporting structure of the floor heave of the soft rock roadway;
FIG. 7 is a schematic view of a central connecting piece of the supporting structure of the floor heave of the soft rock roadway of the invention;
fig. 8 is a schematic view of a third channel steel of the supporting structure for the floor heave of the soft rock roadway;
fig. 9 is a fourth channel steel structure diagram of the supporting structure for the floor heave of the soft rock roadway of the invention;
fig. 10 is a schematic view of a fourth channel steel of the supporting structure for the floor heave of the soft rock roadway of the invention;
fig. 11 is a flow chart of the construction method of the supporting structure of the soft rock roadway floor heave of the invention.
Description of reference numerals: 1: a first channel steel; 2: a second channel steel; 3: a first yielding member; 301: a first slotted steel sleeve; 302: a first horizontal section of channel steel; 303: a steel bar; 304: a spring; 305: a bolt slot; 306: a first oblique channel steel; 307: a second oblique channel steel; 4: a central connecting member; 401: an upper sheathing plate; 402: a lower sheathing plate; 5: a third channel steel; 6: an anchor rod; 7: and a fourth channel steel.
Detailed Description
The supporting structure and the construction method of the soft rock roadway floor heave provided by the invention are further described in detail with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims.
Example 1
Referring to fig. 1, 2, 8 and 10, a supporting structure for a soft rock roadway floor heave comprises: frame portion and a number of anchor rods 6. The frame portion includes: the device comprises a first channel steel 1, a second channel steel 2, a first pressure yielding piece 3, a second pressure yielding piece, a plurality of central connecting pieces 4 and a third channel steel 5. The first channel steel 1 and the second channel steel 2 are arranged in parallel. The central connecting piece 4 is arranged between the first channel steel 1 and the second channel steel 2, and the central connecting piece 4 is positioned below the horizontal planes of the first channel steel 1 and the second channel steel 2. And a third channel steel 5 is connected between every two adjacent central connecting pieces 4. The first yielding piece 3 comprises a first horizontal section channel steel 302, a first oblique channel steel 306 and a second oblique channel steel 307; a first end of the first horizontal section channel steel 302 is fixedly connected with the first channel steel 1, and a first end of the first oblique channel steel 306 and a first end of the second oblique channel steel 307 are fixedly connected with a second end of the first horizontal section channel steel 302; the first oblique channel steel 306 and the second oblique channel steel 307 correspond to two adjacent central connectors 4 respectively, the second end of the first oblique channel steel 306 is fixedly connected with the corresponding central connector 4, and the second end of the second oblique channel steel 307 is fixedly connected with the corresponding central connector 4. The second yielding piece comprises a second horizontal section channel steel, a third oblique channel steel and a fourth oblique channel steel. The first end of the second horizontal section of channel steel is fixedly connected with the second channel steel, and the first end of the third oblique channel steel and the first end of the fourth oblique channel steel are fixedly connected with the second end of the second horizontal section of channel steel; the third oblique channel steel and the fourth oblique channel steel correspond to two adjacent center connecting pieces respectively, the second end of the third oblique channel steel is fixedly connected with the corresponding center connecting piece, and the second end of the fourth oblique channel steel is fixedly connected with the corresponding center connecting piece. The anchor 6 is provided at the bottom side of the frame part. Through adopting central link 4 in supporting construction, first casting die 3 and the second casting die of letting lets of letting, first channel-section steel 1 and second channel-section steel 2's horizontal plane below is located to central link 4, first casting die that lets includes first horizontal segment channel-section steel 302, first slant channel-section steel 306, second slant channel-section steel 307, first horizontal segment channel-section steel 302 links to each other with first channel-section steel 1, first slant channel-section steel 306, second slant channel-section steel 307 links to each other with adjacent central link 4 respectively, the second lets the casting die include second horizontal segment channel-section steel, the third slant channel-section steel, the fourth slant channel-section steel, second horizontal segment channel-section steel links to each other with second channel-section steel 2, the third slant channel-section steel, the fourth slant channel-section steel links to each other with adjacent central link 4 respectively, this kind of tunnel connected mode has increased composite construction's supportable area, the unable large cross-section supporting's of traditional steel bow.
Further, referring to fig. 3 and 5, the first compression member 3 further includes a first slotted steel sleeve 301, and the first slotted steel sleeve 301 is connected to the first channel steel 1 and the first horizontal section channel steel 302 respectively; the second lets the casting die still includes the second channel-section steel bushing, and the second channel-section steel bushing links to each other with second channel-section steel and second horizontal segment channel-section steel respectively.
Further, a first closed cover plate is welded at the head end of the first horizontal section channel steel 302. Corresponding bolt slots 305 are formed in the first slotted steel sleeve 301 and the first horizontal section channel steel 302. Two steel bars 303 are welded on the top surface of the first channel steel sleeve 301 connected with the first horizontal section channel steel 302, threads are machined on the end parts of the steel bars 303, which are far away from the top surface of the first channel steel sleeve 301, and springs 304 are sleeved on the steel bars 303. The steel bar 303 passes through the first closed cover plate and limits the first horizontal section steel channel 302 through bolts. The first channel steel sleeve 301 and the first horizontal section channel steel 302 are bolted through corresponding bolt slots 305. A second closing cover plate is welded to the upper portion of first slotted steel bushing 301 to close the inner space of first slotted steel bushing 301. The inner space of the first slotted steel bushing 301 is filled with rubber particles to play a role of buffering. And a third closed cover plate is welded at the head end of the second horizontal section channel steel. Corresponding bolt slots 305 are formed in the second slotted steel sleeve and the second horizontal section channel steel. Two steel bars 303 are welded on the top surface of the second channel steel sleeve connected with the second horizontal section channel steel, threads are machined on the end parts, deviating from the top surface of the second channel steel sleeve, of the steel bars 303, and springs 304 are sleeved on the steel bars 303. The steel bar 303 passes through the third closing cover plate and limits the second horizontal section channel steel through bolts. The second slotted steel sleeve and the second horizontal section channel steel are bolted through corresponding bolt slots 305. And a fourth closed cover plate is welded on the upper part of the second channel steel sleeve so as to close the inner space of the second channel steel sleeve. The inner space of the second slotted steel sleeve is filled with rubber particles to play a role in buffering. The pressure relief effect of the traditional pressure relief groove is realized through the connection mode of the first groove steel sleeve, the first horizontal section channel steel, the second groove steel sleeve and the second horizontal section channel steel, the limiting spring and the rubber particles are added, the rigid supporting structure and the pressure relief supporting structure are well integrated to form the combined supporting structure, and the floor heave phenomenon of the roadway can be better controlled.
Preferably, the upper half sections and the lower half sections of the first oblique channel steel 306, the second oblique channel steel 307, the third oblique channel steel and the fourth oblique channel steel are arc-shaped channel steels which are tightly attached to the bottom plate and form 60 degrees and 120 degrees with the length direction of the roadway respectively. The bottom of the roadway is in a U shape of an inverted bottom arch, the direction of a force system is changed, vertical stress is converted into other directions, and the stress is further transferred and released by combining a pressure relief structure of the roadway side part.
Further, referring to fig. 4, the center connector 4 includes an upper deck 401 and a lower deck 402, the upper deck 401 and the lower deck 402 cooperating to form a six-slotted steel bushing. The upper and lower sleeve plates of the central connecting piece 4 and the connected channel steels are correspondingly provided with bolt holes, the geometric center of the central connecting piece 4 is provided with an anchor rod hole, the hexagon at the center of the lower sleeve plate 402 is higher than the channel steel sleeve by the thickness of a channel steel bottom plate, and the bottoms of the outer edges of the channel steel sleeves of the lower sleeve plate 402 are connected with each other through steel plates.
Preferably, the anchor 6 is respectively disposed at the bottom side of the first channel steel 1, the bottom side of the second channel steel 2, the bottom side of the central connector 4, the bottom side of the first oblique channel steel 306, the bottom side of the second oblique channel steel 307, the bottom side of the third oblique channel steel, and the bottom side of the fourth oblique channel steel.
Preferably, the edges of the frame portions at the intersection are welded to further increase the stability of the central portion of the base.
Example 2
This embodiment is further defined on the basis of embodiment 1, and the rest is the same as or similar to embodiment 1, and is not described herein again.
Referring to fig. 6 and 7, the design of the central connecting member 4 can also be as shown.
Further, referring to fig. 9 and 10, fourth channels 7 may be further disposed between the first diagonal channels 306 and inside the second diagonal channel 307. The opening direction of the fourth channel steel 7 is the same as the perpendicular direction of the tangent line of the connection point, and after the closed cover plates are welded to the two ends of the fourth channel steel 7 respectively, the fourth channel steel is connected with the first oblique channel steel 306 and the second oblique channel steel 307 through bolts. Through the setting of fourth channel-section steel 7, the intensity of first letting the casting die has further been strengthened. Fourth channel steel 7 can be arranged between the third oblique channel steel and on the inner side of the fourth oblique channel steel. The opening direction of the fourth channel steel 7 is the same as the perpendicular direction of the tangent line of the connection point, and after the closed cover plate is welded at the two ends of the fourth channel steel 7 respectively, the fourth channel steel is connected with the third oblique channel steel and the fourth oblique channel steel through bolts. Through the setting of fourth channel-section steel 7, the intensity of second letting the casting die has further been strengthened.
Example 3
This embodiment is further defined on the basis of embodiments 1 and 2, and the rest is the same as or similar to embodiments 1 and 2, and is not repeated herein.
Referring to fig. 11, a construction method of a supporting structure of a soft rock roadway floor heave includes the following steps:
s1: the method comprises the following steps of (1) digging a bottom plate on a bottom plate of a roadway along the length direction of the roadway to enable the bottom plate to be arc-shaped, paving a layer of concrete on a dug bottom arch, and paving a layer of anchor net on the bottom along the length direction in advance;
s2: laying a frame part;
s3: arranging an anchor rod 6 at the bottom of the frame part;
s4: concrete is filled in the supporting structure, so that the upper surface and the lower surface of the channel steel form an arc-shaped inverted bottom arch along the length direction of the roadway, finally, a layer of anchor net is paved on the upper portion, concrete is poured after the combined structure is completely installed in place, all the structures are covered by the concrete, and meanwhile, the concrete exceeds the original bottom plate position by 10-20 cm. After the concrete is integrally poured, because of two layers of anchor nets on the upper surface and the lower surface of the steel frame, the whole inverted arch arc plate forms a whole, the upward stress of the vertical bottom plate is firstly controlled by a part of the anchor rods, then the residual stress is dispersed by the arc inverted arch shell along the surface of the shell, and finally the residual stress is further decomposed by the first pressing piece and the second pressing piece arranged on the upper part after being transmitted to the upper part along the plate surface, so that the pressure relief effect of the traditional pressure relief groove is achieved. The direction of a force system is changed by adopting an inverted arch U-shaped tunnel bottom, and the vertical stress is converted into other directions.
Furthermore, the excavation depth of the middle point of the cross section of the roadway in the step S1 is 100-120 cm downwards along the length direction of the roadway, and horizontal sections for placing the first channel steel and the second channel steel are reserved on the left side and the right side of the width direction of the roadway.
Preferably, in step S3, vertically downward bolts 6 are drilled through the reserved bolt holes on the center connection member 4; an anchor rod 6 which forms an included angle of 45 degrees with the vertical direction is drilled on the first channel steel 1 and the second channel steel 2 through a reserved anchor rod hole; and drilling an anchor rod 6 which forms an included angle of 30 degrees with the vertical direction through reserved anchor rod holes at the bottom sides of the first oblique channel steel 306, the second oblique channel steel 307, the third oblique channel steel and the fourth oblique channel steel.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, it is still within the scope of the present invention if they fall within the scope of the claims of the present invention and their equivalents.
Claims (8)
1. The utility model provides a supporting construction of soft rock tunnel floor heave which characterized in that includes: the frame part and a plurality of anchor rods;
the frame portion includes: the pressing device comprises a first channel steel, a second channel steel, a first pressing piece, a second pressing piece, a plurality of central connecting pieces and a third channel steel;
the first channel steel and the second channel steel are arranged in parallel;
the central connecting piece is arranged between the first channel steel and the second channel steel and is positioned below the horizontal plane where the first channel steel and the second channel steel are positioned;
the third channel steel is connected between every two adjacent central connecting pieces;
the first yielding piece comprises a first horizontal section channel steel, a first oblique channel steel and a second oblique channel steel;
a first end of the first horizontal section of channel steel is fixedly connected with the first channel steel, and a first end of the first oblique channel steel and a first end of the second oblique channel steel are fixedly connected with a second end of the first horizontal section of channel steel; the first oblique channel steel and the second oblique channel steel respectively correspond to two adjacent central connecting pieces, the second end of the first oblique channel steel is fixedly connected with the corresponding central connecting piece, and the second end of the second oblique channel steel is fixedly connected with the corresponding central connecting piece;
the second yielding piece comprises a second horizontal section channel steel, a third oblique channel steel and a fourth oblique channel steel;
the first end of the second horizontal section of channel steel is fixedly connected with the second channel steel, and the first end of the third oblique channel steel and the first end of the fourth oblique channel steel are fixedly connected with the second end of the second horizontal section of channel steel; the third oblique channel steel and the fourth oblique channel steel respectively correspond to two adjacent central connecting pieces, a second end of the third oblique channel steel is fixedly connected with the corresponding central connecting piece, and a second end of the fourth oblique channel steel is fixedly connected with the corresponding central connecting piece;
a plurality of anchor rod holes are reserved in the frame portion, and the anchor rods are arranged on the bottom side of the frame portion through the anchor rod holes.
2. The soft rock roadway floor heave support structure of claim 1, wherein the first let casting piece further comprises a first channel steel sleeve, and the first channel steel sleeve is respectively connected with the first channel steel and the first horizontal section channel steel; the second lets the casting die still includes the second channel-section steel bushing, the second channel-section steel bushing respectively with the second channel-section steel with the second horizontal segment channel-section steel links to each other.
3. The soft rock roadway floor heave supporting structure of claim 2, wherein a first closed cover plate is welded at the head end of the first horizontal section channel steel;
corresponding bolt grooves are formed in the first groove steel sleeve and the first horizontal section channel steel;
two steel bars are welded on the top surface of the first channel steel sleeve connected with the first horizontal section channel steel, threads are machined on the end parts of the steel bars, which are far away from the top surface of the first channel steel sleeve, and springs are sleeved on the steel bars;
the steel bar penetrates through the first closed cover plate and limits the first horizontal section channel steel through a bolt;
the first channel steel sleeve is connected with the first horizontal section channel steel through bolts of corresponding bolt grooves;
a second closed cover plate is welded on the upper part of the first channel steel sleeve;
a third closed cover plate is welded at the head end of the second horizontal section channel steel;
corresponding bolt grooves are formed in the second groove steel sleeve and the second horizontal section channel steel;
two steel bars are welded on the top surface of the second channel steel sleeve connected with the second horizontal section channel steel, threads are machined on the end parts of the steel bars, which are far away from the top surface of the second channel steel sleeve, and springs are sleeved on the steel bars;
the steel bar penetrates through the third closed cover plate and limits the second horizontal section channel steel through a bolt;
the second channel steel sleeve is connected with the second horizontal section channel steel through bolts of corresponding bolt grooves;
and a fourth closed cover plate is welded on the upper part of the second channel steel sleeve.
4. The soft rock roadway floor heave support structure of claim 1, wherein the central connector comprises an upper sleeve plate and a lower sleeve plate which cooperate to form six slotted steel sleeves.
5. The soft rock roadway floor heave support structure of claim 1, wherein the anchor rods are respectively arranged at the bottom side of the first channel steel, the bottom side of the second channel steel, the bottom side of the central connecting piece, the bottom side of the first oblique channel steel, the bottom side of the second oblique channel steel, the bottom side of the third oblique channel steel and the bottom side of the fourth oblique channel steel.
6. A construction method of a supporting structure for soft rock roadway floor heave is characterized in that the supporting structure is used for installing the soft rock roadway floor heave according to any one of claims 1-5, and the method comprises the following steps:
s1: digging a bottom plate on the bottom plate of the roadway along the length direction of the roadway to enable the bottom plate to be arc-shaped, paving a layer of concrete on the dug bottom arch, and paving a layer of anchor net on the bottom along the length direction in advance;
s2: laying the frame section;
s3: arranging the anchor rod at the bottom of the frame part;
s4: concrete is filled in the supporting structure, so that an arc-shaped inverted bottom arch along the length direction of the roadway is formed on the upper surface and the lower surface of the channel steel, finally, a layer of anchor net is paved on the upper portion, concrete is poured after the supporting structure is completely installed in place, all structures are covered by the concrete, and meanwhile, the concrete exceeds the original bottom plate position by 10-20 cm.
7. The construction method of the supporting structure for the floor heave of the soft rock roadway according to claim 6, wherein in the step S1, the downward digging depth of the middle point of the cross section of the roadway along the length direction of the roadway is 100-120 cm, and horizontal sections for placing the first channel steel and the second channel steel are reserved on the left side and the right side of the width direction of the roadway.
8. The method for constructing a supporting structure of a soft rock roadway floor heave according to claim 7, characterized in that in the step S3, the anchor rod is vertically downwards drilled on the central connecting piece through a reserved anchor rod hole; drilling the anchor rods which form an included angle of 45 degrees with the vertical direction through reserved anchor rod holes on the first channel steel and the second channel steel; and drilling the anchor rods which form an included angle of 30 degrees with the vertical direction through reserved anchor rod holes at the bottom sides of the first oblique channel steel, the second oblique channel steel, the third oblique channel steel and the fourth oblique channel steel.
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| CN203756206U (en) * | 2014-03-19 | 2014-08-06 | 山东科技大学 | Novel soft-rock roadway floor heave governing structure |
| CN104047614B (en) * | 2014-07-15 | 2016-01-13 | 山东科技大学 | A kind of strong expansion argillization soft-rock tunnel displacement supporting method |
| CN106223985B (en) * | 2016-10-10 | 2018-12-28 | 安徽理工大学 | For administering the composite anchored net of deep-well high stress and soft rock mine roadway bottom distension and the construction method of the composite anchored net |
| CN206129285U (en) * | 2016-10-27 | 2017-04-26 | 山东科技大学 | Deep soft rock roadway under high stress crossover point supporting construction |
| CN207111121U (en) * | 2017-05-12 | 2018-03-16 | 贵州理工学院 | A kind of anti-pucking device of coal mine roadway |
| CN107060809B (en) * | 2017-05-15 | 2023-06-16 | 安徽理工大学 | Combined structure for treating floor heave of roadway and construction method |
| CN108019228A (en) * | 2018-01-17 | 2018-05-11 | 安徽理工大学 | A kind of flexibility allow pressure improvement floor lift in gallery combined retaining structure and its construction method |
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