CN113803092A - Support device and method for broken soft rock roadway based on steel pipe concrete support - Google Patents
Support device and method for broken soft rock roadway based on steel pipe concrete support Download PDFInfo
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- CN113803092A CN113803092A CN202111053235.3A CN202111053235A CN113803092A CN 113803092 A CN113803092 A CN 113803092A CN 202111053235 A CN202111053235 A CN 202111053235A CN 113803092 A CN113803092 A CN 113803092A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
- E21D20/021—Grouting with inorganic components, e.g. cement
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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 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
- E21D11/14—Lining predominantly with metal
- E21D11/15—Plate linings; Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members
- E21D11/152—Laggings made of grids or nettings
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses a support device and a support method for a broken soft rock roadway based on a concrete-filled steel tube support, and relates to the technical field of ground mines. The method comprises the following steps: firstly, placing a plurality of hollow grouting anchor rods into surrounding rocks of a roadway, and performing advanced grouting reinforcement support; then spraying concrete on the surrounding rocks of the roadway to form a concrete layer, and crushing the rocks on the surface of the roadway into a whole through the concrete layer; erecting a bending-resistant early-strength concrete-filled steel tube support structure at a certain distance from the plastic plate; pouring early-strength concrete into the support, arranging bending-resistant reinforcing steel bars in the circumferential direction of the roadway on the outer side of the support, and constructing a bending-resistant early-strength reinforced concrete arch body with a certain thickness between the plastic plate and the bending-resistant reinforcing steel bars; and finally, arranging a plastic plate pressure-bearing layer between the roadway surrounding rock and the bending-resistant early-strength reinforced concrete arch body. According to the invention, the super-strong grouting reinforcement technology is combined with the bending-resistant concrete-filled steel tube support structure, so that the deformation of surrounding rock can be effectively controlled, and the supporting effect is good.
Description
Technical Field
The invention relates to the technical field of ground mines, in particular to a support device and a support method for a broken soft rock roadway based on a concrete-filled steel tube support.
Background
As the mining of modern coal mines extends deep, the geological conditions of the mine become increasingly complex. Soft rock is one of the soft rock, and the supporting problem of a soft rock roadway is also emphasized. Research shows that the deep soft rock roadway generates asymmetric deformation due to the structural effect under the influence of factors such as the direction of a ground stress field, the attitude of a rock stratum, the asymmetry of a rock mass structure, the differential deformation of key parts and the like, so that the conventional symmetric support cannot be controlled, the self-bearing capacity of the surrounding rock of the roadway is weak, the deformation speed and the deformation of the roadway are high, and the mine production is greatly influenced. In the aspect of soft rock roadway support in the prior art, the requirements of mine production are not met due to the reasons of technology, capital investment and the like.
The soft rock roadway is mainly characterized in that:
(1) due to the rock mass structure and the environment of the rock stratum, the rock stratum is soft, the rock stratum is seriously crushed and has higher ground stress; (2) the rock mass has the characteristics of low strength, rheology, weathering, expansion and the like for physical and mechanical properties of the rock mass; (3) for the engineering characteristics of surrounding rocks, the roadway pressure comes to be strongly displayed, and the surrounding rock deformation has the surrounding pressure coming characteristic and the obvious time effect; (4) the initial pressure is fast, the deflection is big, and the stable back country rock still lasts big deformation for a long time at a certain speed, and the stability of country rock is difficult to control. Namely: the weak rock layer roadway has the characteristics of looseness, scattering, softness and weakness. The existing research shows that the rock mass and rock stratum structural surface are the main reasons causing the reduction of the surrounding rock strength of the roadway and the generation of asymmetric large-degeneration damage, and the control of the structural surface is the key of asymmetric supporting design, which also provides a basis for the control of the soft rock roadway.
Due to the characteristics of the soft rock roadway, the soft rock roadway has certain difficulties in supporting. At present, in the prior art, in the aspect of soft rock roadway support, a series of technologies of anchor spraying, anchor net spraying, anchor spraying net frame and prestressed anchor cable support, a series of technologies of steel frame support, a series of technologies of reinforced concrete support, a series of technologies of stone arch support, and a series of technologies of grouting reinforcement and pressure relief support are formed. The related research reports in the prior art are mainly as follows:
application number 202011539713.7 discloses a supporting method of a soft rock tunnel, which utilizes numerical simulation software to establish model analysis and carry out real-time tunnel surrounding rock deep displacement monitoring and loosening circle analysis, and analyzes stress distribution and convergence displacement of two sides of an asymmetric surrounding rock tunnel; the support technology of two-digging two-anchor net one-spraying steel belt based on the support principle of giving first and resisting later is utilized to carry out subarea support on the high stress area and the low stress area. The supporting process comprises short anchor rods, long anchor rods, primary anchor nets, secondary anchor nets, double-layer reinforcing steel bars, sprayed concrete and the like.
Application number 202021246768.4 discloses a steel canopy that high ground pressure soft rock tunnel was strutted, is connected with the steel canopy leg through U type card cable respectively in two bottoms on steel canopy top, the bottom fixed connection parallels of steel canopy leg, and the steel canopy leg is fixed in tunnel terrace junction and is provided with U shaped steel dog, and U shaped steel floorbar is fixed in between parallels and the U shaped steel dog of tunnel both sides, constitutes a U shaped steel canopy and struts wholly.
Although the supporting of the soft rock tunnel in the prior art is researched, the supporting effect is still to be further improved, such as a U-shaped steel retractable support, an anchor-spraying net support, a fully-closed supporting system with a retractable or yielding device, and a composite supporting aiming at a key part are the main methods for supporting the coal mine soft rock crushing dynamic pressure tunnel. However, how the supporting effect of the soft rock roadway is depends on the selection of the supporting mode and is also related to the geological conditions of the roadway, the stress state of surrounding rocks and the like. Therefore, many studies are required to find an effective supporting method.
Disclosure of Invention
One of the purposes of the invention is to provide a support method of a broken soft rock roadway based on a concrete-filled steel tube support, which combines an ultra-strong grouting reinforcement technology with a bending-resistant concrete-filled steel tube support structure, can effectively control the deformation of surrounding rocks, and has a good support effect.
In order to achieve the purpose, the invention adopts the following technical scheme:
a support method of a broken soft rock roadway based on a concrete-filled steel tube support sequentially comprises the following steps:
a. reinforcing and supporting by advanced grouting
Placing a plurality of hollow grouting anchor rods into the surrounding rock of the roadway, taking each hollow grouting anchor rod as a grouting pipe, and injecting grouting liquid into the surrounding rock of the roadway through the grouting pipes to reinforce and support the surrounding rock of the roadway;
the grouting liquid is a mixed liquid of portland cement, water glass and a water reducing agent, and the water-ash content ratio in the portland cement is 0.7: 1-1: 1, wherein the mass of the water reducing agent is 0.8-1.0% of that of the portland cement, and the volume of the water glass is 0.4-0.6% of that of the portland cement;
b. spraying concrete on the surrounding rocks of the roadway to form a concrete layer, and forming broken rocks on the surface of the roadway into a whole through the concrete layer;
covering a plastic plate on the surface of the concrete layer, wherein the compressive strength of the plastic plate is more than or equal to 250 kPa;
c. construction of anti-bending early-strength concrete-filled steel tube support structure
Erecting a bending-resistant early-strength concrete-filled steel tube support structure at a certain distance from the plastic plate, wherein the bending-resistant early-strength concrete-filled steel tube support structure is formed by connecting a plurality of independent supports together, the distance between every two adjacent supports is 0.6-1.0 m, each support comprises a straight wall section, an arc section, a top arc section and an inverted-bottom arch section, the straight wall section and the arc section are provided with two sections, the arc sections are correspondingly connected to the top ends of the straight wall sections, and the straight wall section, the arc sections and the top arc sections form an inverted-U-shaped structure; the inverted bottom arch section is arranged in a bottom plate rock stratum, a grouting hole is formed in the right side of the inverted bottom arch section, and a grouting short pipe serving as a grouting nozzle is arranged outside the grouting hole;
d. pouring early-strength concrete into the bending-resistant early-strength concrete filled steel tube support structure;
e. bending-resistant reinforcing steel bars are arranged in the circumferential direction of a roadway on the outer side of the bending-resistant early-strength concrete-filled steel tube support structure, early-strength concrete made of sulfate cement is sprayed between the plastic plate and the bending-resistant reinforcing steel bars, and a bending-resistant early-strength concrete arch body with a certain thickness is formed; the roadway surrounding rock is supported by the anti-bending early-strength reinforced concrete support structure and the anti-bending early-strength reinforced concrete arch body;
f. a plastic plate yielding layer is arranged between the roadway surrounding rock and the bending-resistant early-strength reinforced concrete arch body, a wood block yielding is arranged in the bending-resistant early-strength reinforced concrete arch body, and a yielding window is reserved to form the early-strength-bending-yielding concrete arch body.
The beneficial technical effects directly brought by the technical scheme are as follows:
the method has the advantages that the surrounding rock of the soft rock roadway is extremely broken, the roadway is firstly subjected to advanced grouting reinforcement and support, caving and large deformation after excavation of the roadway are prevented, the self strength of the surrounding rock is improved by adopting a porous advanced grouting technology, and the early-stage stability of the roadway is controlled. Meanwhile, the grouting liquid is a mixed liquid of portland cement, water glass and a water reducing agent, and can play a good supporting role while controlling extremely broken surrounding rocks.
And further spraying a concrete layer on the surrounding rock of the roadway to enable the broken rock on the surface of the roadway to form a whole, covering a layer of plastic plate with higher strength on the concrete layer, and constructing an anti-bending early-strength concrete-filled steel tube support structure on the outer side of the plastic plate. Through designing the early strong steel pipe concrete support structure of bending resistance, involve the supporting structure wherein, the connection between leg joint design and the support, it is concrete, the supporting structure divide into the four sections, be the straight wall section respectively, the circular arc section, top arc section and anti-bottom arch section, cooperate oval-shaped sectional tunnel, can be in the tunnel around the pressure very big and distribute the application under the inhomogeneous condition, can with tunnel country rock stress dispersion to the less position of other pressurized degrees of support when adopting early strong steel pipe concrete support structure to strut, similar form release country rock stress of letting press, the concentrated atress of alleviating steel pipe concrete support.
And further supporting the surrounding rock of the roadway by constructing the anti-bending early-strength reinforced concrete arch body and the anti-bending early-strength reinforced concrete support structure.
In a preferable scheme of the invention, in the step a, slurry outlet holes are arranged at intervals of 20 meters from the end head of the hollow grouting anchor rod, and a rubber plug matched with the slurry outlet holes is arranged at the slurry outlet holes.
As another preferable scheme of the invention, in the step a, the section of the roadway is in a flat oval shape or a round shape; the hollow grouting anchor rod is driven in along the axis of the roadway at an inclination angle of 30 degrees.
Further preferably, in step b, the thickness of the plastic plate is 100 mm.
Preferably, in the step c, the sections of the bracket are connected by a sleeve, the sleeve comprises an upper end steel pipe and a lower end steel pipe, and a retaining ring for preventing the sleeve from sliding downwards is arranged in the circumferential direction of the lower end steel pipe; and an exhaust hole is arranged near the center of the top of the bending-resistant early-strength concrete filled steel tube support structure.
Furthermore, in the step c, the straight wall section is connected with the inverted bottom arch section through a bottom plate flange, the bottom plate flange is connected through four bolts, and bolt holes corresponding to the four bolts are symmetrically distributed on four corners of the steel plate base; one of the baseboard flanges is welded on the straight wall section, and the other baseboard flange is welded on the inverted bottom arch section; the adjacent brackets are connected by adopting a clamping steel belt with the thickness of 20 mm.
Furthermore, in the step e, the early strength concrete is prepared by mixing 8 mass percent of sulphoaluminate cement.
The invention also aims to provide a support device of a broken soft rock roadway based on a concrete-filled steel tube support, which comprises a super-strong grouting reinforcement structure, a concrete structure, a bending-resistant early-strength concrete-filled steel tube support structure, a bending-resistant early-strength concrete arch structure and a plastic plate pressure-yielding layer, wherein the super-strong grouting reinforcement structure comprises a plurality of hollow grouting anchor rods, each hollow grouting anchor rod is arranged in the surrounding rock of the roadway, and grouting liquid is injected into the hollow grouting anchor rods to form the super-strong grouting reinforcement structure;
the concrete structure comprises a concrete layer, the concrete layer is formed by spraying concrete on surrounding rocks of the roadway, and a plastic plate with certain strength is covered on the surface of the concrete layer;
the bending-resistant early-strength concrete filled steel tube support structure is positioned on the outer side of the plastic plate and is formed by connecting a plurality of independent bending-resistant early-strength concrete filled steel tube supports together, wherein the distance between every two adjacent supports is 0.6-1.0 m, each support comprises a straight wall section, an arc section, a top arc section and an inverted-bottom arch section, the straight wall section and the arc section are provided with two sections, the arc sections are correspondingly connected to the top ends of the straight wall sections, and the straight wall sections, the arc sections and the top arc sections form an inverted-U-shaped structure; the inverted bottom arch section is arranged in a bottom plate rock stratum, a grouting hole is formed in the right side of the inverted bottom arch section, a grouting short pipe serving as a grouting nozzle is arranged outside the grouting hole, and the grouting short pipe is positioned on the inverted bottom arch section;
early-strength concrete is poured into the bending-resistant early-strength steel pipe concrete bracket structure; arranging anti-bending reinforcing steel bars in the circumferential direction of the roadway on the outer side of the anti-bending early-strength steel pipe concrete support structure;
the bending-resistant early-strength reinforced concrete arch body is formed by spraying early-strength concrete made of sulfate cement between the plastic plate and the bending-resistant reinforcing steel bars, the bending-resistant early-strength reinforced concrete support structure and the bending-resistant early-strength reinforced concrete arch body form a common support body, and roadway surrounding rocks are supported through the common support body;
the plastic plate pressure-yielding layer is positioned between the roadway surrounding rock and the bending-resistant early-strength reinforced concrete arch body, a wood block pressure-yielding is arranged in the bending-resistant early-strength reinforced concrete arch body, and a pressure-yielding window is reserved to form an early-strength-bending-pressure-yielding concrete arch body structure.
Furthermore, the thickness of the anti-bending early-strength reinforced concrete arch body is 400mm, and a steel bar reticulated shell is arranged in the anti-bending early-strength reinforced concrete arch body and is used for increasing the anti-bending property of the concrete arch body.
Furthermore, the reinforcing bar net shell ligature in the circumferencial direction in concrete outside tunnel, it includes a plurality of bending resistance reinforcing bars, the row spacing between bending resistance reinforcing bar is 300 x 300mm, bending resistance reinforcing bar overlap joint length is 700mm, bending resistance reinforcing bar adopts the ligature of bundle silk overlap joint.
Compared with the prior art, the invention has the following beneficial technical effects:
(1) the invention provides a support method of a broken soft rock roadway based on a concrete-filled steel tube support, which comprises the steps of firstly adopting an advanced grouting reinforcement technology, placing a plurality of hollow grouting anchor rods into surrounding rocks of the roadway, injecting grouting liquid with pressure into the surrounding rocks, and adopting a flat oval roadway section shape; spraying a concrete layer on the surrounding rock of the roadway, and covering a layer of plastic plate with higher strength on the concrete layer; erecting a bending-resistant early-strength concrete-filled steel tube support at a certain distance from a plastic plate, arranging high-strength bending-resistant reinforcing steel bars in the circumferential direction of a roadway outside the support, spraying early-strength concrete to form a bending-resistant early-strength concrete arch body, and arranging a wood block in the concrete arch body for yielding and reserving a yielding window. The invention solves the problem that the surrounding rock of the roadway is broken, soft and difficult to support in the broken extremely weak surrounding rock, replaces the traditional related roadway support technology, and utilizes the technology to innovate, thereby realizing the effects of high support resistance, stable yielding of the surrounding rock and sealing reinforcement of the bracket.
(2) In order to prevent caving and large deformation after the roadway is excavated, the method adopts an advanced grouting reinforcement technology to improve the strength of the surrounding rock and control the early-stage stability of the roadway. Meanwhile, water glass capable of increasing firmness degree is added into the grouting liquid, and a good supporting effect can be achieved when extremely broken surrounding rocks are controlled.
(3) According to the invention, by combining the designed anti-bending early-strength concrete-filled steel tube support structure with the roadway with the flat oval cross section, the stress of the surrounding rock of the roadway can be dispersed to other positions of the support with smaller compression degree, the stress of the surrounding rock is released in a manner similar to yielding, and the concentrated stress of the concrete-filled steel tube support is relieved.
(4) In order to adapt to overlarge bending moment generated by the deformation and extrusion action of the roadway and consider the characteristic that a concrete filled steel tube tension area is easy to damage, the invention adopts an anti-bending early-strength concrete filled steel tube support structure to carry out anti-bending strengthening on the concrete filled steel tube tension area; round steel is adopted as a technical means for bending resistance strengthening; the core concrete in the concrete filled steel tube adopts early-strength concrete, so that the hardening speed of the concrete is increased, and the phenomenon that the steel tube is damaged due to the fact that the deformation speed of surrounding rocks of a roadway is too high is prevented.
(5) The invention adopts the structure of the anti-bending early-strength reinforced concrete arch body, prevents the outer side of the concrete arch body from being bent and pulled to be damaged due to the deformation and extrusion of the surrounding rock of the roadway, and adds the reinforcing steel bar net shell on the outer side of the concrete arch body so as to increase the anti-bending property of the concrete arch body; the early strength concrete is adopted, so that the hardening speed of the concrete is improved, and roadway support and surrounding rock deformation control are facilitated; in order to deal with the characteristic of large deformation of surrounding rocks of the roadway, the damage of the large deformation of the surrounding rocks to the structure of the anti-bending early-strength reinforced concrete arch body is reduced, and the annular deformation capability of the structure of the anti-bending early-strength reinforced concrete arch body is increased, namely the deformation capability of the concrete arch body is increased in the circumferential direction of the structure of the anti-bending early-strength reinforced concrete arch body.
(6) The invention also provides a support device of the broken soft rock roadway based on the concrete-filled steel tube support, which is beneficial to roadway support and surrounding rock deformation control by mutual cooperation of a super-strong grouting reinforcement structure, a concrete structure, a bending-resistant early-strength concrete-filled steel tube support structure, a bending-resistant early-strength concrete arch body structure and a plastic plate.
Drawings
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is a cross-sectional view of the roadway surrounding rock grouting of the present invention;
FIG. 2 is a longitudinal sectional view of the roadway surrounding rock grouting in the invention;
FIG. 3 is an overall construction view of a support of the steel pipe concrete support according to the present invention;
FIG. 4 is a schematic view of the structure of the grouting holes in the present invention;
FIG. 5 is a schematic view of the construction of the joint sleeve of the present invention;
FIG. 6 is a schematic view of the stop ring position of the present invention;
FIG. 7 is a schematic view of a cradle steel plate base of the present invention;
FIG. 8 is a schematic structural view of an inverted arch support joint of the present invention;
FIG. 9 is a schematic view showing the operation of the concrete pump grouting line according to the present invention;
FIG. 10 is a supporting scheme of the anti-bending early strength steel pipe concrete support and the arch body in the invention;
FIG. 11 is a longitudinal cross-sectional view of the concrete arch body of the present invention;
FIG. 12 is a horizontal cross-sectional view of the concrete arch body of the present invention;
FIG. 13 is a view of the construction of the retractable plank of the present invention;
FIG. 14 is a schematic perspective view of a "crush window" of a roadway floor in accordance with the present invention;
FIG. 15 is a vertical cross-sectional view of a floor "yield window" roadway in accordance with the present invention;
fig. 16 is a top view of the tunnel floor "crush windows" in the present invention.
Wherein, 1, the anti-bending early-strength steel pipe concrete support structure; 2. an anti-bending early-strength reinforced concrete arch body; 3. yielding wood blocks; 4. a plastic panel; 5. a roadway; 6. a hollow grouting anchor rod; 7. a sleeve; 8. a top arc segment; 9. a straight wall section; 10. an inverted bottom arch section; 11. grouting holes; 12. grouting short pipes; 13. a baffle ring; 14. a steel pipe; 15. a steel plate base; 16. bolt holes; 17. a concrete delivery pump; 18. a high-pressure rubber hose; 19. a floor rock layer; 20. bending-resistant reinforcing steel bars; 21. and (5) reinforcing steel bar reticulated shells.
Detailed Description
The invention provides a support device and a support method for a broken soft rock roadway based on a concrete-filled steel tube support, and the support device and the support method are described in detail below with reference to specific embodiments in order to make the advantages and the technical scheme of the support device clearer and clearer.
The invention relates to a support device for a broken soft rock roadway based on a concrete-filled steel tube support, which comprises a super-strong grouting reinforcement structure, a concrete structure, a bending-resistant early-strength concrete-filled steel tube support structure, a bending-resistant early-strength concrete reinforced arch body structure and a plastic plate yielding layer;
the super-strong grouting reinforcement structure comprises a plurality of hollow grouting anchor rods, wherein each hollow grouting anchor rod is arranged in surrounding rocks of a roadway, and grouting liquid with pressure is injected into the hollow grouting anchor rods to form the super-strong grouting reinforcement structure;
the concrete structure comprises a concrete layer and a concrete layer, wherein the concrete layer is formed by spraying concrete on surrounding rocks of a roadway, and a plastic plate with certain strength is covered on the surface of the concrete layer;
the bending-resistant early-strength concrete-filled steel tube support structure is positioned on the outer side of a plastic plate and is formed by connecting a plurality of independent bending-resistant early-strength concrete-filled steel tube supports, wherein the distance between every two adjacent supports is 0.6-1.0 m, each support comprises a straight wall section, an arc section, a top arc section and an inverted-bottom arch section, the straight wall section and the arc section are provided with two sections, the two sections of arc sections are correspondingly connected to the top ends of the corresponding straight wall sections, and the straight wall section, the arc section and the top arc section form an inverted-U-shaped structure; the inverted arch section is arranged in the bottom plate rock stratum, a grouting hole is formed in the right side of the inverted arch section, a grouting short pipe serving as a grouting nozzle is arranged outside the grouting hole, and the grouting short pipe is positioned on the inverted arch section;
pouring early-strength concrete into the anti-bending early-strength steel pipe concrete support structure; arranging anti-bending reinforcing steel bars 20 in the circumferential direction of the roadway on the outer side of the anti-bending early-strength steel pipe concrete support structure;
the anti-bending early-strength reinforced concrete arch body is formed by spraying early-strength concrete made of sulfate cement between a plastic plate and anti-bending reinforcing steel bars, the anti-bending early-strength reinforced concrete support structure and the anti-bending early-strength reinforced concrete arch body form a common support body, and roadway surrounding rocks are supported through the common support body;
the plastic plate pressure-yielding layer is positioned between the roadway surrounding rock and the bending-resistant early-strength reinforced concrete arch body, a wood block is arranged in the bending-resistant early-strength reinforced concrete arch body for yielding, and a yielding window is reserved to form an early-strength-bending-yielding concrete arch body structure.
The thickness of the anti-bending early-strength reinforced concrete arch body is 400mm, a steel bar reticulated shell is arranged in the anti-bending early-strength reinforced concrete arch body, and the steel bar reticulated shell is used for increasing the anti-bending property of the concrete arch body.
The steel bar latticed shell is bound in the circumferential direction of a roadway on the outer side of concrete and comprises a plurality of bending-resistant steel bars, the row spacing between the bending-resistant steel bars is 300 multiplied by 300mm, the lap joint length of the bending-resistant steel bars is 700mm, and the bending-resistant steel bars are bound by binding wire lap joints.
The present invention will be described in detail with reference to specific examples.
Example 1:
a supporting device of a broken soft rock roadway based on a steel pipe concrete support is characterized in that a plurality of hollow grouting anchor rods 6 are arranged in surrounding rocks of the roadway, and grouting liquid with pressure is injected into the surrounding rocks by the grouting anchor rods. The section shape of the tunnel 5 adopts a round shape or a flat oval shape.
And (2) spraying a concrete layer on the surrounding rock of the roadway (the concrete is sprayed to form a whole by crushing the rock on the surface of the roadway), and covering a layer of high-strength plastic plate 4 (the compressive strength is more than 250 kPa) on the concrete layer, wherein the thickness of the plastic plate 4 is 100 mm.
The bending-resistant early strength steel tube concrete support structure 1 is erected at a distance (typically 50-60mm) from the plastic slab 4. The bending-resistant early-strength concrete-filled steel tube support structure comprises a plurality of independent supports, wherein each independent support is made of phi 194 multiplied by 10mm steel tubes with the model number of 45.4kg/m and adopts phi 40 high-strength round steel for bending resistance strengthening, the tensile strength is 600MPa, an outer side welding mode is adopted, the distance between every two adjacent supports is 0.6m, and the supports are connected through clamping steel belts with the thickness of 20 mm.
And phi 25 high-strength bending-resistant reinforcing steel bars 20 are arranged in the circumferential direction of the roadway on the outer side of the concrete support, and sulphate aluminum cement is adopted to prepare early-strength concrete to prepare C30 early-strength concrete. And early strength concrete is sprayed between the plastic plate and the bending-resistant reinforcing steel bars to form the bending-resistant early strength reinforced concrete arch body 2. The thickness of the bending-resistant early-strength reinforced concrete arch body 2 is 400 mm.
Arranging a yielding wood block 3 in the concrete arch body, wherein the thickness of the wood block is 160 mm; and reserving yielding windows, namely only supporting one third of the perimeter of the section of the roadway, and reserving the lower half parts of the bottom plate and the two sides as the yielding windows, wherein the yielding windows are reserved on the bottom plate and the two sides of the roadway every other support.
The invention relates to a broken weak surrounding rock roadway support method based on a concrete-filled steel tube support, which specifically comprises the following steps:
first step, advance slip casting reinforcing support
The advanced grouting reinforcement step comprises the following steps: selection of grouting liquid, arrangement of grouting drill holes and a grouting method.
(1) Preparation of slip casting solutions
The Portland cement-water glass double grout (425#525 Portland cement) with low price is selected as the grouting liquid, and in consideration of the defects that the cement paste is easy to settle and has high water precipitation rate, low calculus rate and low strength, a proper amount of water glass and a water reducing agent can be added into the Portland cement with a water-cement ratio of (0.7-1): 1 to form the Portland cement-water glass double grout (grouting liquid).
The addition amount of the water reducing agent is as follows: the weight ratio of the water reducing agent to the cement is 0.8-1.0%, the high-efficiency naphthalene water reducing agent can obviously improve the fluidity of cement slurry, improve the stability of the cement slurry, has little influence on the setting time, and can effectively improve the compressive strength, especially the later strength, of a cement slurry concretion body.
The water glass addition amount is as follows: the volume ratio of the water glass to the cement is 0.4-0.6%, the water glass can obviously increase the concretion rate of the cement grout, shorten the setting time (including initial setting and final setting), greatly influence the early strength of the concretion body of the cement grout, and obviously improve the early strength.
(2) Arranging grouting boreholes
The hollow grouting anchor rod 6 is adopted for advanced grouting, and in order to achieve better grouting effect, a drill hole needs to be added to the hollow grouting anchor rod 6 every 20cm from the end. After the drilling is well processed, the rubber is used for plugging, so that the water pressure cannot be lost during drilling, normal rubber grouting can be ejected out due to higher pressure during grouting, and the plugging degree is determined in a processing plant test. The advanced grouting anchor rod is driven in along the axial line of the roadway at 30 degrees. The cross section of roadway surrounding rock grouting for advance support is shown in figure 1, and the longitudinal section of roadway surrounding rock grouting for advance support is shown in figure 2.
(3) Grouting method
The advanced grouting reinforcement support technology adopts a hollow grouting anchor rod 6 as a grouting pipe to carry out advanced support and reinforcement on surrounding rocks. When the deformation of the surrounding rock is not stable after the roadway is excavated, the grouting liquid is used for filling and consolidating the surrounding rock, so that the broken surrounding rock is cemented into a continuous body reinforcing ring, a reliable acting foundation is provided for the anchor rod, and the grouting anchor rod can play a role in suspension and extrusion.
The advanced grouting technology aims to reduce and control the convergence deformation rate after the roadway is excavated.
Second step, build the anti-bending early strength steel pipe concrete support structure
And (2) spraying a concrete layer on the surrounding rock (the concrete is sprayed to form a whole by crushing the rock on the surface of the roadway), covering a layer of high-strength plastic plate 4 (the compressive strength is more than 250 kPa) on the concrete layer, wherein the thickness of the plastic plate 4 is 100mm, and erecting the anti-bending early-strength steel pipe concrete support structure 1 outside the plastic plate 4.
In order to adapt to overlarge bending moment generated by the deformation and extrusion action of the roadway, the bending resistance strengthening is carried out on the tension area of the concrete-filled steel tube bracket by considering the characteristic that the tension area of the concrete-filled steel tube is easy to damage; round steel is adopted as a technical means for bending resistance strengthening; the core concrete in the concrete filled steel tube adopts early-strength concrete, so that the hardening speed of the concrete is increased, and the phenomenon that the steel tube is damaged due to the fact that the deformation speed of surrounding rocks of a roadway is too high is prevented.
(1) Support structure
The bending-resistant early-strength steel pipe 1 is made of a steel pipe model of phi 194 multiplied by 10mm and 45.4kg/m, bending-resistant reinforcement is carried out by adopting phi 40 high-strength round steel, the tensile strength is 600MPa, and an outer side welding mode is adopted. The concrete filled steel tube support structure is divided into four sections: the straight wall section 9, the top arc section 8, the reverse bottom arch section 10 and two arc sections positioned at the tops of the two straight wall sections; wherein the inverted arch sections 10 are arranged in the floor strata 19 and the sections are connected by casing 7, and the overall structure of the support is shown in figure 3.
The right side of the inverted-bottom arch-shaped section 10 is provided with a grouting hole 11, a grouting short pipe 12 (namely a grouting nozzle) is welded outside the grouting hole 11, and the side of the grouting short pipe is separated from the side of the ditch arrangement to avoid conflict. Concrete is poured from the grouting holes 11, the steel pipe is vibrated by a vibrator to compact the concrete, after the grouting is stable, the grouting pipeline is dismounted, and the grouting short pipe 12 is plugged by a log plug. In order to ensure the compactness of concrete inside the steel pipe and monitor the filling condition of the concrete in real time, the exhaust holes are specially reserved and are positioned at the positions of 10mm left and right of the center of the top of the support. As shown in fig. 4.
(2) Design of bracket connection
a. The arc section at the top of the bracket is connected with the lower part
The arc sections of the bracket are connected by a joint sleeve 7, the sections of the steel pipes at the two ends are aligned at first, and then the steel pipes 14 with the same radian are sleeved outside to ensure that the steel pipes at the two ends are concentrically connected; meanwhile, to prevent the slip of the joint sleeve 7, a stopper ring 13 is welded on the lower end steel pipe along the circumference. The joint sleeve 7 is shown in fig. 5, and the retainer ring 13 is positioned in the shape of fig. 6.
b. Connection of support straight wall section and inverted arch section
The straight wall section 9 and the inverted bottom arch section 10 are connected through a bottom plate flange, the bottom plate flange is connected through four bolts, bolt holes 16 are symmetrically distributed in four corners of the steel plate base 15 and are 40mm away from the long edge and the short edge. The flange of the bottom foot plate is welded on the straight wall section 9 in a piece as shown in the figure; the other sheet is welded to the inverted arch section 10 as shown in fig. 7 and 8.
Considering that the grouting pressure may be affected by poor sealing performance at the corner flange in the grouting process, a rubber pad with the thickness of 10mm needs to be added between the upper steel plate base and the lower steel plate base. The rubber pad is processed into the same form and size as the steel plate base 15.
c. Connection between concrete filled steel tube supports
The adjacent brackets are connected by adopting clamping steel belts with the thickness of 20mm, and the space between the brackets is 0.6 m.
Thirdly, pouring concrete into the reinforced concrete support
And after the reinforced concrete support is installed, the concrete in the reinforced concrete support can be poured. The concrete delivery pump 17 is horizontally placed on the roadway 5 and is connected with the support grouting short pipe 12 through the high-pressure rubber pipe 18, and the grouting pipe of the concrete delivery pump 17 is arranged as shown in figure 9. It will be noted that grouting pipe spool 12 is located on the inverted bottom arch section 10, and therefore the position of grouting pipe spool 12 is reserved for the embedment of inverted bottom arch section 10 in floor bed 19.
The bracket pouring concrete adopts early strength concrete, the concrete is prepared by adopting 8 percent of sulphoaluminate cement, and the early strength concrete is prepared as shown in the table 1. Experimental test results show that the initial setting time of the concrete is about 120 minutes, the compressive strength of the early-strength concrete test block in the 8-hour age can reach 24.7MPa, and the 24-hour strength can reach 42.8 MPa.
Timely perfusion: and 4 frames of supports are poured once every time, short-distance grouting is adopted, and the distance between a grouting pump and the supports is shortened.
TABLE 1 early Strength concrete design proportions and Material dosages
Fourthly, preparing the bending-resistant early-strength reinforced concrete arch body
The phi 25 high-strength bending-resistant ribs 20 are arranged in the circumferential direction of the roadway outside the reinforced concrete support, early-strength concrete is made of sulphoaluminate cement, C30 early-strength concrete is prepared, the early-strength concrete is sprayed to form the bending-resistant early-strength reinforced concrete arch body, and the bending-resistant early-strength reinforced concrete support and the arch body are supported together, as shown in figure 10. The design arch body thickness of the bending-resistant early-strength reinforced concrete arch body is 400mm, as shown in figures 11 and 12.
The anti-bending early-strength reinforced concrete arch body can prevent the outer side of the concrete arch body from being bent and broken due to the deformation and extrusion of the surrounding rock of the roadway, and a steel bar reticulated shell is arranged in the concrete arch body to increase the anti-bending property of the concrete arch body; the early strength concrete is adopted, so that the hardening speed of the concrete is improved, and roadway support and surrounding rock deformation control are facilitated; in order to deal with the characteristic of large deformation of surrounding rocks of the roadway, the damage of the large deformation of the surrounding rocks to the concrete arch body is reduced, and the annular deformation capability of the concrete arch body is increased, namely the deformation capability of the concrete arch body is increased in the annular direction of the concrete arch body.
(1) Binding steel bar net shell
Phi 25 bending-resistant steel bars 20 are arranged in the circumferential direction of the roadway on the outer side of the concrete, as shown in figures 10 and 11, the row spacing is 300 multiplied by 300mm, the lapping length of the steel bars is 700mm, the contact bars are manufactured by adopting phi 10 wire rod processing, and the spacing is 600 mm. The reinforcing bar adopts the bundle wire overlap joint ligature, and when the ligature reinforcing bar, the row spacing must be controlled within the design range between the reinforcing bar, and the reinforcing bar protective layer also need accord with design and standard requirement.
(2) Stable formwork work
According to the design requirements of construction drawings and the middle and waist lines of a roadway given by measuring personnel, an arch base line of the roadway and two side lines of the roadway are released, a wall template of the roadway is stabilized simultaneously from inside to outside according to the arch base line and the side lines, the wall template is firstly connected into a whole and is arranged outside the side lines and below the arch base line, then wall stand columns are erected at the joints of wallboards and are fixedly connected into a whole by using palladium nails, then an upper wooden support rod and a lower wooden support rod are erected on each fixed wooden wedge of the wall stand columns and are fixed firmly, finally, an upper layer of inclined wooden support, a middle layer of inclined wooden support and a lower layer of inclined wooden support are arranged between the wallboards and the roadway walls to reinforce the firm wallboards, and a top column is arranged between the upper wooden support rod and the lower wooden support rod. The ash sliding pipe and the pouring process do not displace. The specification and the size of the template are ensured to meet the design requirements, and after all parts are firmly and reliably connected, the tunnel arch part is poured and tightly sealed. And drawing the concrete into a tunnel pouring template, pouring the tunnel wall part by using a compressed air type concrete conveying tank, and symmetrically vibrating the concrete compactly.
After the pouring of the concrete on the wall part of the roadway is finished and the concrete is initially set, 150mm and 150mm lifting beams are respectively fixed on the upright columns of the two side walls. According to the design requirements of a roadway center line, a waist line and a construction drawing, the arch tires and templates of an arch part are stably erected step by step from inside to outside, each arch tire is fixedly fixed on a lifting beam by using a palladium nail, the three arch tires are connected into a whole by using three sand wooden rods, one end of each arch tire abuts against a tunnel face, at least 5 inclined struts are arranged between each arch tire and a rock upper, at least 4 inclined struts are uniformly arranged between the arch tire close to one side of the tunnel face and the tunnel face, and a tire plate is covered on the arch tires.
When the arch tire and the template are stably erected, the shapes, the sizes and the mutual position relations of all the parts must be ensured, the assembly and the disassembly are convenient, the joint is tight, and the slurry leakage is not easy. The sizes of the punchhole tires need to meet the design requirements, and all parts need to be supported firmly.
(3) The cast-in-place concrete support adopts sulphoaluminate cement to prepare early strength concrete, and is prepared into C30 early strength concrete
A set of concrete mixing station and a storage yard are arranged near the wellhead of the auxiliary shaft, a light rail and an empty lane connecting rail are laid below the discharge port of a mixer, and the mixed concrete is conveyed to the underground working surface through a cage by utilizing 1.5 tons of mine cars. The concrete is transported to the tunnel arch form by the ash chute, and is vibrated symmetrically and hierarchically by two wind-driven inserted high-frequency vibrating rods, and the vibration is carried out by a special fixing person. The concrete slump should be kept within the designed range during construction, and concrete mixing is strictly carried out according to the mixing proportion of C30 concrete.
The concrete material is fed into the mould by manual work, the concrete material is uniformly fed into the mould, the vibration is strengthened after the concrete material is fed into the mould, the vibration is carried out by positioning, fixing and quantifying, the phenomena of honeycombs, pitted surfaces and dog holes are prevented, the height of the vertical mould is 500 plus materials 600mm each time when a wall is built, and the template and the supporting legs are fixedly firm so as to be convenient for vibration. The building arch is built from inside to outside, two sides of the building arch are opposite when the formwork is erected, the formwork is laid flat, the width of the formwork does not exceed 200mm, and the formwork is sealed tightly by the sealing arch. The embedded parts fixed on the template have no omission of the prepared holes, and the installation is firm, and when working aloft, the support frame is fully paved with large plates, and operators need to fasten safety belts. The vibration is mechanically vibrated (a pneumatic vibration rod), and is cast and tamped after being put into a mold. Vibrating and inserting a vibrating rod once every 400mm position, wherein each layer is not more than 300 mm.
When the door is closed, the door is vibrated along with closing, so that the closing compactness is ensured, and the phenomena of vibration compactness and no hole are ensured. When the two sections of concrete connection positions are constructed, sundries and floating waste rocks are cleaned up after being washed by clean water, and then concrete is poured.
And after the template is dismantled, watering and maintaining in time. The strength of the concrete when the template is removed can ensure that the surface and edges and corners of the template are not damaged; when the arch form is disassembled, the concrete is in accordance with the design requirement; and removing the template after one week of pouring.
Step five, yielding
(1) And (3) arranging a plastic plate for yielding, and placing a plastic plate yielding layer between the roadway surrounding rock and the concrete arch body, as shown in figure 10. When the surrounding rock of the roadway deforms, the surrounding rock releases partial pressure, the pressure borne by the steel rod concrete support under the stress action of the surrounding rock is relieved, the required supporting resistance is reduced, and the stability of the roadway is enhanced.
(2) Arranging a yielding wood block in the concrete arch body, wherein the thickness of the wood block is 160mm, as shown in figure 13; reserving yielding windows, namely reserving the yielding windows at the bottom plate and the two sides of the roadway every other support, namely only supporting one third of the perimeter of the section of the roadway, and reserving the lower half parts of the bottom plate and the two sides as the yielding windows, as shown in fig. 14-16.
(3) Arch body yielding property: a deformation joint is arranged between the concrete arch body and the surrounding rock for yielding, and a deformation joint is arranged in the concrete arch body for yielding.
The invention adopts the super-strong grouting technology, and water glass capable of increasing the firmness degree is injected into the grouting liquid, so that the surrounding rock is controlled to be easily broken, and meanwhile, a good supporting effect can be achieved.
In combination with the ultra-strong grouting technology, the roadway is designed to be oval in section, so that multiple factors such as the size and direction of ground pressure on the roadway are comprehensively considered, in view of the situations that surrounding rock of a soft rock roadway is loose and broken, the strength of the surrounding rock is low, and asymmetric large deformation is easy to occur, the oval section can be applied under the situation that the pressure around the roadway is very high and is distributed unevenly, when the anti-bending early-strength steel pipe concrete support structure is adopted for supporting, the stress of the roadway can be dispersed to other positions with smaller compression degree of the support, the stress of the surrounding rock is released in a manner similar to yielding, and the concentrated stress of the steel pipe concrete support is relieved.
The supporting device and the supporting method are particularly suitable for supporting the broken surrounding rock roadway, and can achieve a good supporting effect on the broken surrounding rock.
The parts which are not described in the invention can be realized by taking the prior art as reference.
It should be noted that: any equivalents or obvious modifications thereof which may occur to persons skilled in the art and which are given the benefit of this description are deemed to be within the scope of the invention.
Claims (10)
1. A support method of a broken soft rock roadway based on a concrete filled steel tube support is characterized by sequentially comprising the following steps:
a. reinforcing and supporting by advanced grouting
Placing a plurality of hollow grouting anchor rods into the surrounding rock of the roadway, taking each hollow grouting anchor rod as a grouting pipe, and injecting grouting liquid into the surrounding rock of the roadway through the grouting pipes to reinforce and support the surrounding rock of the roadway;
the grouting liquid is a mixed liquid of Portland cement, water glass and a water reducing agent, the mass ratio of water to ash in the Portland cement is 0.7: 1-1: 1, the mass of the water reducing agent is 0.8-1.0% of that of the Portland cement, and the volume of the water glass is 0.4-0.6% of that of the Portland cement;
b. spraying concrete on the surrounding rocks of the roadway to form a concrete layer, and forming broken rocks on the surface of the roadway into a whole through the concrete layer;
covering a plastic plate on the surface of the concrete layer, wherein the compressive strength of the plastic plate is more than or equal to 250 kPa;
c. construction of anti-bending early-strength concrete-filled steel tube support structure
Erecting a bending-resistant early-strength concrete-filled steel tube support structure at a certain distance from the plastic plate, wherein the bending-resistant early-strength concrete-filled steel tube support structure is formed by connecting a plurality of independent supports together, the distance between every two adjacent supports is 0.6-1.0 m, each support comprises a straight wall section, an arc section, a top arc section and an inverted-bottom arch section, the straight wall section and the arc section are provided with two sections, the arc sections are correspondingly connected to the top ends of the straight wall sections, and the straight wall section, the arc sections and the top arc sections form an inverted-U-shaped structure; the inverted bottom arch section is arranged in a bottom plate rock stratum, a grouting hole is formed in the right side of the inverted bottom arch section, and a grouting short pipe serving as a grouting nozzle is arranged outside the grouting hole;
d. pouring early-strength concrete into the bending-resistant early-strength concrete filled steel tube support structure;
e. bending-resistant reinforcing steel bars are arranged in the circumferential direction of a roadway on the outer side of the bending-resistant early-strength concrete-filled steel tube support structure, early-strength concrete made of sulfate cement is sprayed between the plastic plate and the bending-resistant reinforcing steel bars, and a bending-resistant early-strength concrete arch body with a certain thickness is formed; the roadway surrounding rock is supported by the anti-bending early-strength concrete-filled steel tube support structure and the anti-bending early-strength concrete arch body;
f. a plastic plate yielding layer is arranged between the roadway surrounding rock and the bending-resistant early-strength reinforced concrete arch body, a wood block yielding is arranged in the bending-resistant early-strength reinforced concrete arch body, and a yielding window is reserved to form the early-strength-bending-yielding concrete arch body.
2. The support method for the broken soft rock roadway based on the concrete filled steel tube support according to claim 1, characterized in that: in the step a, the hollow grouting anchor rod is provided with grout outlet holes at intervals of 20 meters from the end head, and a rubber plug matched with the grout outlet holes is arranged at the grout outlet holes.
3. The support method for the broken soft rock roadway based on the concrete filled steel tube support according to claim 1, characterized in that: in the step a, the section of the roadway is in a flat oval shape or a round shape; the hollow grouting anchor rod is driven in along the axis of the roadway at an inclination angle of 30 degrees.
4. The support method for the broken soft rock roadway based on the concrete filled steel tube support according to claim 1, characterized in that: in step b, the thickness of the plastic plate is 100 mm.
5. The support method for the broken soft rock roadway based on the concrete filled steel tube support according to claim 1, characterized in that: in the step c, all the sections of the bracket are connected by using a sleeve, the sleeve comprises an upper end steel pipe and a lower end steel pipe, and a retaining ring for preventing the sleeve from sliding downwards is arranged in the circumferential direction of the lower end steel pipe; and an exhaust hole is arranged near the center of the top of the bending-resistant early-strength concrete filled steel tube support structure.
6. The support method for the broken soft rock roadway based on the concrete filled steel tube support according to claim 1, characterized in that: in the step c, the straight wall section is connected with the inverted bottom arch section through a bottom plate flange, the bottom plate flange is connected through four bolts, and bolt holes corresponding to the four bolts are symmetrically distributed on four corners of the steel plate base; one of the baseboard flanges is welded on the straight wall section, and the other baseboard flange is welded on the inverted bottom arch section; the adjacent brackets are connected by adopting a clamping steel belt with the thickness of 20 mm.
7. The support method for the broken soft rock roadway based on the concrete filled steel tube support according to claim 1, characterized in that: in the step e, the early strength concrete is prepared by mixing 8% of sulphoaluminate cement by mass percent.
8. The utility model provides a support device in broken type soft rock tunnel based on concrete filled steel tube support, it includes that superstrong slip casting reinforced structure, concrete structure, the early strong type concrete filled steel tube supporting structure of bending resistance, the early strong type concrete arch body structure of bending resistance and plastic slab let the pressure layer, its characterized in that:
the super-strong grouting reinforcement structure comprises a plurality of hollow grouting anchor rods, wherein each hollow grouting anchor rod is arranged in surrounding rocks of a roadway, and grouting liquid is injected into the hollow grouting anchor rods to form the super-strong grouting reinforcement structure;
the concrete structure comprises a concrete layer, the concrete layer is formed by spraying concrete on surrounding rocks of the roadway, and a plastic plate with certain strength is covered on the surface of the concrete layer;
the bending-resistant early-strength concrete filled steel tube support structure is positioned on the outer side of the plastic plate and is formed by connecting a plurality of independent bending-resistant early-strength concrete filled steel tube supports together, wherein the distance between every two adjacent supports is 0.6-1.0 m, each support comprises a straight wall section, an arc section, a top arc section and an inverted-bottom arch section, the straight wall section and the arc section are provided with two sections, the arc sections are correspondingly connected to the top ends of the straight wall sections, and the straight wall section, the arc sections and the top arc sections form an inverted-U-shaped structure; the inverted bottom arch section is arranged in a bottom plate rock stratum, a grouting hole is formed in the right side of the inverted bottom arch section, a grouting short pipe serving as a grouting nozzle is arranged outside the grouting hole, and the grouting short pipe is positioned on the inverted bottom arch section;
the bending-resistant early-strength concrete-filled steel tube support structure is filled with early-strength concrete; arranging anti-bending reinforcing steel bars in the circumferential direction of the roadway on the outer side of the anti-bending early-strength steel pipe concrete support structure;
the bending-resistant early-strength reinforced concrete arch body is formed by spraying early-strength concrete made of sulfate cement between the plastic plate and the bending-resistant reinforcing steel bars, the bending-resistant early-strength reinforced concrete support structure and the bending-resistant early-strength reinforced concrete arch body form a common support body, and roadway surrounding rocks are supported through the common support body;
the plastic plate pressure-yielding layer is positioned between the roadway surrounding rock and the bending-resistant early-strength reinforced concrete arch body, a wood block pressure-yielding is arranged in the bending-resistant early-strength reinforced concrete arch body, and a pressure-yielding window is reserved to form an early-strength-bending-pressure-yielding concrete arch body structure.
9. The support device for the broken soft rock roadway based on the concrete filled steel tube support according to claim 8, characterized in that: the thickness of the anti-bending early-strength reinforced concrete arch body is 400mm, a steel bar reticulated shell is arranged in the anti-bending early-strength reinforced concrete arch body, and the steel bar reticulated shell is used for increasing the anti-bending property of the concrete arch body.
10. The support device for the broken soft rock roadway based on the concrete filled steel tube support according to claim 9, characterized in that: the steel bar latticed shell is bound in the circumferential direction of a roadway on the outer side of concrete and comprises a plurality of bending-resistant steel bars, the row spacing between the bending-resistant steel bars is 300 multiplied by 300mm, the lap joint length of the bending-resistant steel bars is 700mm, and the bending-resistant steel bars are bound by binding wire lap joints.
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| CN103032080A (en) * | 2012-12-21 | 2013-04-10 | 江苏建筑职业技术学院 | Support method of weak and broken surrounding rock tunnel |
| CN109372555A (en) * | 2018-12-26 | 2019-02-22 | 中国矿业大学 | A kind of fault disruption zone area tunnel 3 D stereo grouting support method |
| US20210087931A1 (en) * | 2020-10-15 | 2021-03-25 | Shandong University Of Science And Technology | Grouting bolt-cable composite beam and supporting method for advanced support of fractured surrounding rock in deep coal mines |
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2021
- 2021-09-09 CN CN202111053235.3A patent/CN113803092B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101130942A (en) * | 2007-09-06 | 2008-02-27 | 长业建设集团有限公司 | Soft-ground multi-cell twin-cantilever arched bridge structure and its construction method |
| CN101634148A (en) * | 2009-08-05 | 2010-01-27 | 朱奎 | Soil nailing wall foundation pit support and construction method |
| CN103032080A (en) * | 2012-12-21 | 2013-04-10 | 江苏建筑职业技术学院 | Support method of weak and broken surrounding rock tunnel |
| CN109372555A (en) * | 2018-12-26 | 2019-02-22 | 中国矿业大学 | A kind of fault disruption zone area tunnel 3 D stereo grouting support method |
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