CN212272234U - High-strength combined template for open groove section of large-section inclined shaft - Google Patents

Abstract

The utility model belongs to the technical field of inclined shaft construction, and discloses a high-strength combined template of a large-section inclined shaft open trough section, which comprises an inner template and an outer template arranged outside the inner template, wherein arc-shaped binding steel bars are also arranged between the inner template and the outer template, the inner template is formed by assembling a plurality of combined templates, each combined template comprises four support legs and nine combined arch slabs, the outer template comprises steel slabs and nine centimeter slabs, and the steel slabs are fixedly connected to the inner template through the nine centimeter slabs and the lengthening bolts. And the working efficiency and the construction progress are improved.

Description

High-strength combined template for open groove section of large-section inclined shaft

Technical Field

The utility model belongs to the technical field of the inclined shaft construction, especially, relate to a big section inclined shaft open cut groove section high strength built-up plate.

Background

Under the national policy and the influence of supply and demand relations of clean coal markets, the China's peaceful coal Shenma group performs capacity upgrading and transformation on high-quality mines in response to the trend, and releases high-quality capacity; combining the problems existing in the current group mine production and the long-term development planning of the group, a main inclined shaft project is added in the first mountain and the first mine in time, and the capacity is upgraded; therefore, the construction of the main inclined shaft project puts higher requirements on the construction period, and the construction speed must be increased; the first mine owner inclined shaft is used as a group key engineering project, the construction period is urgent, the pedestrian open cut is used as a key line project, the construction speed is critical, the construction period of the whole inclined shaft is influenced, and the construction progress and the quality of the inclined shaft relate to the construction capacity and the management level of a construction unit and the management level of other participating units.

The design engineering quantity of the first-mountain one-mine main inclined shaft is 2723.1m, the design engineering quantity comprises a shaft section, a pedestrian mouth section and a coal conveying mouth section, the pedestrian mouth section and the coal conveying mouth section comprise open groove construction, the open groove design of the pedestrian mouth section of the main inclined shaft is 29.85m, the gradient is-19.8 degrees, the tunneling width is 6.2m, the tunneling height is 4.7m, and the tunneling section S =26.7m²The method is characterized in that double-layer steel bars are adopted for supporting the arch, T =400mm, the thickness of the bottom of a roadway is 200mm, and gravel sheet slurry is 300mm, and as the section of the open trench is large in the row, the supporting form is complex, the supporting workload is large (after the open trench is excavated, temporary anchor net spraying is performed on the slope, the gravel sheet slurry is paved on the bottom of the slope, double-layer steel bar binding supporting is performed, and 400mm thick concrete pouring is performed).

Disclosure of Invention

The utility model aims at providing a big section inclined shaft open groove section high strength built-up plate.

In order to achieve the above purpose, the utility model adopts the technical scheme that:

the utility model provides a big section inclined shaft open groove section high strength composite shuttering, includes the inner formword and sets up in the exterior sheathing in the inner formword outside, still be equipped with arc ligature reinforcing bar between inner formword and the exterior sheathing, the inner formword is assembled by many frame composite shuttering and is formed, and every composite shuttering comprises four landing legs and nine block combination arch bars, the exterior sheathing includes lath and nine centimetre boards, the lath is through nine centimetre boards and extension bolt fixed connection to on the inner formword.

Furthermore, the edge of each combined arch plate is provided with a connecting lug, and two adjacent combined arch plates are fixedly connected through bolts penetrating through the lugs.

Furthermore, each supporting leg is transversely provided with a connecting hole in the vertical direction, the adjacent supporting legs are reinforced through connecting rods penetrating through the connecting holes, and the transverse connecting holes of the supporting legs can be anchored on the surrounding rock through anchor rods.

A construction method of a large-section inclined shaft open groove section comprises the following steps:

1) open trench excavation: excavating the open trench by a layering and segmenting method, wherein the layering height is 1.5-2 m, the open trench is excavated in two segments, and the excavation length of each segment is 15 m;

2) assembling an inner template: laying an inclined shaft bottom plate, building a workbench in a shaft, fixedly assembling support legs and a combined arch of one combined template, and repeatedly assembling a plurality of combined templates until the length reaches 30 meters;

3) binding steel bars: the steel bar binding construction sequence is that the inner ring round bar, the inner ring transverse bar, the outer ring round bar, the outer ring transverse bar and the lacing bar are arranged;

4) assembling an outer template: connecting the steel plate strips and the nine-centimeter plates to the inner template through lengthened bolts, and reserving a concrete pouring and vibrating gap at the top of the outer template every 0.5 m;

5) pouring concrete and dismantling a template: carrying out concrete pouring from the concrete pouring and vibrating gap by using a concrete conveying pump, vibrating once by using a vibrating bar every pouring section until the surface of the concrete returns to the slurry, and carrying out template dismantling operation 48 hours after the concrete pouring is finished and solidified;

6) pre-grouting of the pipe shed: the pipe shed pre-grouting can be operated in parallel with the Mingcao pouring;

7) inclined shaft surface water prevention: and coating an asphalt waterproof layer on the outer surface of the well wall of the shaft.

Further, in the step 1), a secondary sedimentation tank is arranged outside an excavation boundary before open groove excavation, a water suction well with the depth of 2 meters is excavated in the center of a shaft, a water pump is placed in the water suction well to be discharged to the sedimentation tank, the water suction well is correspondingly excavated with the depth of 2 meters when each layer is excavated, excavation is carried out according to an excavated sideline, a drainage ditch is arranged in an excavation area, slurry spraying and reinforcement are carried out on a side slope and an upward slope in the open groove excavation process, the slurry spraying thickness is 50mm, an anchor net is arranged on the upward slope, the anchor rod specification is phi 22 multiplied by 2400mm, the distance is 800 multiplied by 800mm, a metal net is woven by phi 4mm cold drawn wires, and the mesh is 50 multiplied by 50mm to ensure the stability of the side slope. Excavating a layer, spraying and supporting the layer by an anchor net, and brushing edges from the middle to two sides.

Further, two steel pipes are vertically fixed on two sides of the workbench in the shaft direction in the step 2) and are used for fixing the wall columns, the wall columns are strictly vertically arranged according to the placed side lines, and the distance between the wall columns is 1250 mm.

The utility model has the advantages that:

1. the method is characterized in that a diversion trench and pre-grouting comprehensive water prevention and control technology is adopted, the purposes of well drying and slope stabilization are achieved through measures of 'preventing, blocking, dredging, discharging and intercepting', after working face pre-grouting, the total water inflow of the working face is only 0.5 m/h, the goal that the total water inflow of an open trench is not more than 2 m/h is achieved, in the open trench excavation process, the excavation depth is enough for one row of net distance, one row of anchor net spraying and supporting is achieved, a water blocking wall is formed on the surface of a slope, a grouting pipe is pre-buried before grouting, surface soil excavation, temporary anchor spraying and supporting and slope pre-grouting can achieve parallel operation, surface soil is timely sealed and reinforced, effective water prevention and water blocking are conducted, meanwhile, the open trench slope and surrounding soil are effectively reinforced, integrity is stronger, soil mass collapse can be effectively prevented, and the slope is kept stable;

2. by means of comprehensive slope protection by anchor net spraying and grouting, slope collapse accidents do not happen during open trench construction, and 0 accident rate is realized;

3. the high-strength combined steel template is designed to be used as the open channel inner template, the combination is fast, the strength is high, the rework is avoided, the well wall connecting stubble is smooth, the slab staggering is small, the impression is good, the open channel section template assembly period is saved by 6 days, and the whole surface soil section template assembly can be saved by more than 20 days through calculation;

4. the novel assembled wood formwork is designed to serve as an outer formwork, the problems that an outer formwork is difficult to plug and reinforce and the forming of the outer surface of the well wall is poor are solved, manual input and concrete material input are saved, the forming of the outer surface of the well wall is regular, the appearance is good, the inner surface and the outer surface of the well wall are smooth, the quality of the well wall is over-hard, and the pitted surface phenomenon is avoided;

5. the method comprises the steps of pre-embedding grouting pipes in a bottom plate before concrete pouring of the bottom plate of the open channel section, performing wall back grouting after the concrete strength of the bottom plate meets conditions, isolating a water source of the bottom plate, pre-embedding the grouting pipes in a backfill space after the wall strength of a well of the open channel section meets backfill conditions, performing wall back grouting after the backfill is completed, and isolating a water source around the well wall, surface water and the like, so that the permanent quality of the inclined shaft is ensured, and the direct economic benefit of the research result is more than 213.4 ten thousand yuan after incomplete estimation.

Drawings

FIG. 1 is a schematic cross-sectional view of the high-strength composite form of the present invention.

Fig. 2 is a schematic side view of the high-strength composite shuttering of the present invention.

Fig. 3 is a partially enlarged view of the composite template of the present invention.

1. Combining the templates; 11. a support leg; 12. a combined arch bar; 121. hanging a lug; 2. a steel plate strip, 3, nine-centimeter plates; 4. the bolts are lengthened.

Detailed Description

As shown in the figure, a big section inclined shaft open groove section high strength built-up plate, includes the inner formword and sets up in the exterior sheathing in the inner formword outside, still be equipped with arc ligature reinforcing bar between inner formword and the exterior sheathing, the inner formword is assembled by many built-up plate 1 and is formed, and every built-up plate 1 comprises four landing legs 11 and nine block combination arches 12, the exterior sheathing includes lath 2 and nine centimetre boards 3, lath 2 is through nine centimetre boards 3 and 4 fixed connection of extension bolt on the inner formword.

Furthermore, the edge of each combined arch bar 12 is provided with a connecting lug 121, and two adjacent combined arch bars 12 are fixedly connected through bolts penetrating through the lugs 121.

Further, all be equipped with the connecting hole on every landing leg 11 transversely and the vertical direction, can consolidate through the connecting rod of wearing to locate in the connecting hole between the adjacent landing leg 11, and the 11 horizontal connecting holes of landing leg can be through the stock anchor to the country rock on.

A construction method of a large-section inclined shaft open groove section comprises the following steps:

1) open trench excavation: according to the hydrological and geological data of the inclined shaft, the maximum water inflow of the fourth series of loose-gap aquifer is about 34.6 m/h, the water yield is large, and the water prevention and control work is strictly carried out according to the operation rules and the research results in the excavation process. In order to facilitate drainage in the excavation process, a secondary sedimentation tank is arranged at a proper position outside the excavation boundary, and before open trench excavation, sundries in a construction area are firstly cleaned and leveled, and the edge line of excavation is drawn. During excavation, drainage ditches are excavated around the excavation area, construction in rainy days (seasons) is avoided, and flood control materials are equipped. The excavation depth is adjusted according to the stable condition of the surface soil layer in the construction process. The open trench adopts a layered and segmented excavation method, the layered height is 1.5-2 m, 2 segments of excavation are carried out, and the excavation length of each segment is 15 m; the open trough section is excavated by a large excavator, and is matched with a manual shovel to transport soil by a forklift. Digging 2m deep in a drawn side line frame, then digging downwards from the far end of an open groove, and starting to discharge water when digging to 3.5m deep, digging a 2m deep water suction well in the center of a shaft for convenience of digging, putting a water pump into the water suction well, and flowing the surrounding water to the water well to facilitate the surrounding digging, wherein the water suction well is deepened once when digging one layer. When the excavation is about to be finished, two small water-absorbing wells (the concrete can not be poured on the vertical template except the designed well wall of the shaft) are excavated at the two sides of the deepest part of the shaft, and a water pump is placed to discharge the small water-absorbing wells into a ground sedimentation tank. In order to facilitate soil throwing of the excavator, soil is dug in the later period in a retreating mode from far to near and from deep to shallow, the soil is influenced by a ground railway, the slope and the slope facing slope are large in gradient (the slope is designed to be 50 degrees and face slope 60 degrees), the slope and the slope facing slope are timely sprayed and reinforced in the open trench digging process, the spraying thickness is 50mm, an anchor net is required to be arranged on the slope facing slope, the anchor rod specification is phi 22 multiplied by 2400mm, the distance is 800 multiplied by 800mm, the metal net is woven by phi 4mm cold-drawn wires, and the mesh is 50 multiplied by 50mm, so that the slope stability is ensured. And excavating a layer, and spraying and supporting the layer by using an anchor net, so that not only is the collapse of the side slope and the head-on slope prevented, but also a water blocking wall is formed for surface soil water burst, and conditions are created for further excavation. Due to the fact that the section of the open groove is large, excavation and supporting of the left side and the right side of the open groove are conducted alternately, and the side slope is guaranteed to be supported in time. The excavation sequence is from the middle to two sides, the edge is brushed at the last, before brushing the edge, the sideline is checked again, and a large amount of excess excavation and underexcavation are avoided. When brushing the edge, widening 500mm outside the designed excavation size of the inclined shaft, excavating a temporary ditch as a diversion ditch, and guiding water to the suction wells on two sides of the bottom of the inclined shaft.

The construction of the open channel section is right in rainy season, and the surface water inflow also has certain influence on the open channel excavation. When the water is excavated to the bottom of the open slot, the water inflow begins to increase, and the maximum water inflow reaches 43m³And h, threatening the construction safety. A large amount of water flows to a shaft bottom suction well through the diversion ditches at the two sides and is timely discharged into the sedimentation tank through a drainage pump. Water gushing from two sides, particularly water gushing at an upward slope is not obviously attenuated, so that the grouting of a working surface is performed in time according to research results in a segmented mode. The grouting material adopts cement slurry, cement and water glass double-liquid slurry are selected as necessary, the goal of reinforcing and blocking water outlet is achieved through slurry permeation and water seepage cracks, the water inflow amount of the working surface is controlled quickly, and the flood hazard is eliminated.

The implementation effect is as follows: by adopting the water diversion trench and pre-grouting comprehensive water prevention and control technology and adopting the measures of prevention, blockage, dredging, drainage, interception and the like, the purposes of well drying and slope stabilization are achieved. After the working face is pre-grouted, carrying out dry top-dressing on the working face, wherein the total water inflow amount of the working face is only 0.5 m/h; excavating the open trench by a layering and segmenting method, wherein the layering height is 1.5-2 m, the open trench is excavated in two segments, and the excavation length of each segment is 15 m;

2) assembling an inner template: in order to shorten the construction time and process conversion, a combined steel template is designed, internal machine maintenance factories carry out nonstandard processing, a total of 30m combined templates are processed (both a surface soil section below an open groove and a main inclined shaft coal conveying port can be used), and the combined templates are accepted by engineering places and qualified to be conveyed to a construction site.

Each combined template is composed of 4 legs and 9 combined arches, the machining precision is high, and if a deviation of 10mm occurs, the combined templates are difficult to combine into one block. Therefore, before brouhaha legs are brouhaha, the bottom plate of the shaft is laid according to the given waist line, and when the bottom plate is laid, a plurality of points are found under the waist line, and then the bottom plate is found into a line by using the aluminum alloy ruler rod.

After the inclined shaft bottom plate is paved, a workbench is built in the shaft, the workbench is built upwards from the working face, the building of the workbench is firm and reliable when the steel pipe is tied in the soil facing the steel pipe, the thickness of the wood plate paved on the workbench is not less than 50mm, and the inclined shaft bottom plate is firm and firm. Two steel pipes are vertically fixed on two sides of the workbench along the shaft direction and are used for fixing wall columns, and the wall columns are strictly vertical up and down according to the placed side lines when being fixed. The wall-column spacing (mid-mid) is 1250 mm.

The implementation effect is as follows: the surface of the inner template is smooth, the strength of the template is high, the assembling period of the inner template is half time shorter than that of the inner template adopting the traditional box plate, and the rapid assembly is realized;

3) binding steel bars: the steel bar binding construction sequence is that the inner ring round bar, the inner ring transverse bar, the outer ring round bar, the outer ring transverse bar and the lacing wire, and the construction method comprises the following steps: the inner round ribs are firstly arranged for several times, and the wood wedge match pad and the inner die are kept at a distance of 50 mm. And 3-4 transverse ribs are placed and firmly tied by using iron wires, and then the inner round ribs on the first transverse rib are placed from the working face along with the gradient of the roadway. After the inner round ribs are paved, transverse ribs are paved, and the distance between the transverse ribs and the round ribs is 250mm according to the design requirement. The outer circular ribs are laid as the inner circular ribs, 250mm hook ribs are firstly used for laying a plurality of point positions, then the transverse ribs are laid as required, the point positions are well fixed, the laying is started when no problem is detected, and the inner circular ribs and the outer circular ribs are kept vertical. The transverse ribs and the first transverse rib are also vertical. After all the layers are paved, binding the 400mm steel bars one support at intervals of one meter, taking out all the wood wedges, and strictly forbidding the wood wedges when concrete is poured. The lapping of the steel bars is not less than 40 times of the steel bars;

4) assembling an outer template: and after the steel bars are bound, assembling the outer template. The outer template is erected by the cooperation of a steel plate strip, a nine-centimeter plate and a connecting lengthened screw rod. Selecting a wood template, binding a 400mm steel bar at the connecting rib, setting up the template at intervals of 500mm, connecting the joints of the wall templates by battens, and reinforcing the 400mm battens of the wall templates by using transverse braces. The arch template junction is linked with the steel band, and every 500mm is connected with the inner formword with the wire drawing, and positive top department leaves a template and is used for concreting and vibrates, compares box plate construction in the past, and this built-up plate is because it is firm to connect, and every template integral forming, overlap joint are few, have solved open groove outside template and have consolidated the difficulty, and shaping subalternation problem can effectively reduce the phenomenon that appears pitted skin, hole. The combined steel template can be erected and formed at one time, the arch template is formed at one time, the curve is attractive, concrete pouring is carried out after reinforcement, the conversion among working procedures is reduced, and the production efficiency is improved;

5) pouring concrete and dismantling a template: and after the steel bars are bound, assembling the outer template. The outer template is erected by the cooperation of a steel plate strip, a nine-centimeter plate and a connecting lengthened screw rod. Selecting a wood template, binding a 400mm steel bar at the connecting rib, setting up the template at intervals of 500mm, connecting the joints of the wall templates by battens, and reinforcing the 400mm battens of the wall templates by using transverse braces. The arch template junction is linked with the steel band, and every 500mm is connected with the inner formword with the wire drawing, and positive top department leaves a template and is used for concreting and vibrates, compares box plate construction in the past, and this built-up plate is because it is firm to connect, and every template integral forming, overlap joint are few, have solved open groove outside template and have consolidated the difficulty, and shaping subalternation problem can effectively reduce the phenomenon that appears pitted skin, hole. The combined steel template can be erected and formed at one time, the arch template is formed at one time, the curve is attractive, concrete pouring is carried out after reinforcement, the conversion among working procedures is reduced, and the production efficiency is improved;

6) pre-grouting of the pipe shed: and (3) constructing pipe shed grouting pipes 500mm above and on two sides of the contour line of the vault at the bottom of the inclined shaft, wherein the length of the first round of circulating supporting pipe shed pipes is 8m, the pipe shed pipes are dug for 6m, and the lap joint length is kept for 2 m. And (3) performing pre-grouting support on the subsequent surface soil section engineering pipe shed according to the length of 6m, digging for 4m, and reserving the lap joint length of 2 m. During specific construction, the distance between steel pipes is 300mm, the steel pipes are phi 50mm seamless steel pipes, one-inch pipes and 4-minute pipes are welded at the outer ends of pipe sheds, the length of each pipe is 2m and the length of each pipe is 1.5m (as grouting pipes and grout outlet pipes), the sealing depth is 1m, grout outlet holes (the distance between the grout outlet holes is 200-300 mm) are drilled in advance in the steel pipe bodies, grout can be spread to the periphery of the steel pipes during grouting, the inner ends of the steel pipes are machined to be conical and convenient to install, a phi 108mm flange plug disc is welded at one end of a pre-buried pipe phi 75mm multiplied by 10m steel pipe (a phi 108mm flange plug disc is welded at the other end of the steel pipe, a hole is drilled at the other end of the steel pipe with a hole length of 1 m), the pre-buried pipe is screwed after being installed, grouting is conducted by connecting grouting pipelines, grouting is stopped when grouting pressure reaches 4MPa, grouting is observed on a grouting surface. And repeatedly grouting until the design requirement is met. When grouting is started, the phi 25mm ball valve on the joint is opened, slurry in the pipe of the pipe shed is allowed to flow back outwards along the drill hole, and the periphery of the pipe shed is filled with slurry to be agglomerated into a whole and form a firm whole with a soil layer after grouting. The hole sealing pressure is controlled to be 4 MPa. The pre-buried hole is constructed, a hole is installed and injected until the grouting is finished, the pipe shed pre-grouting construction can be operated in parallel with the open groove pouring well wall, good conditions are created for the inclined shaft to enter the blind cave construction, compared with the pre-grouting of the working face after backfilling, the operation in an open space is more convenient, the grouting pump is directly arranged on the ground, the occupied time of measure engineering is reduced, and the construction period is shortened

7) Inclined shaft surface water prevention: in order to ensure the permanent use quality of the inclined shaft, before the open groove is backfilled, an asphalt waterproof layer is smeared on the outer surface layer of the shaft wall of the shaft to prevent surface water from infiltrating into the inclined shaft, grouting pipes are embedded in the side slopes on the two sides of the open groove, and then the inclined shaft is backfilled according to the requirements. And backfilling by adopting a manual and mechanical tamping method. After 28 days of pouring, the shaft wall is horizontally filled with clay or mixed soil layer by layer, and rolled layer by layer. The maximum diameter of stones contained in the backfill soil is not more than 100mm, the clay laying thickness is generally controlled to be 300-400 mm, and the number of compaction passes is 4-6. The pre-buried grouting pipes are uniformly arranged in backfill spaces on two sides of the inclined shaft, 10 grouting pipes are arranged in total, and after backfilling is finished, arm post-grouting is carried out on the ground. The grouting reinforcement adopts a single-liquid grouting method, a double-liquid grouting method and a QBZ-BI waterproofing agent (3.8 percent) combined grouting method. The final hole grouting pressure is controlled to be 4MPa, so that the damage to the well wall and the slurry output from the ground are avoided.

Benefit analysis

First, economic benefit analysis

The calculation basis of the listed economic benefits is as follows:

1. the high-strength combined template is designed, all the surface soil bricklaying arch segments can be used, and compared with the traditional template which has one small shift and one frame, the whole combined template has two small shifts, the time of construction of 30 meters inclined shaft is saved by 5 days, and 141m saved manpower =240 yuan/12 people × 3 × 141/28 × 5 yuan =21.6 ten thousand.

2. The 141 meter topsoil segment may be 141/28 x 5=25 days earlier, saving excavator lay costs =4000 x 25=10 ten thousand yuan.

3. The budget of a grouting water interception scheme of a deep hole and a shallow hole on the ground is about 173 ten thousand, the budget of a construction scheme of a diversion trench, pre-grouting and post-grouting is 66 ten thousand, and the cost for treating surface soil and water is saved by 173-66=107 ten thousand.

By combining the analysis, the engineering progress is improved, the human resources are saved and the economic benefit of 138 ten thousand is finally obtained from the technical application effect.

Second, social benefits

The use of the high-strength integral template has extremely obvious economic benefit in construction application, solves the problems that the construction progress of a surface soil section is slow and the staggered stubble forming is poor due to slow concrete pouring speed of the upright arch of the traditional assembled template, enhances the deformation capacity of the template, prolongs the service life of the template, further increases the safety and stability of construction, and improves the working efficiency and the construction progress. The social benefits achieved by the resulting security cannot be estimated.

Claims (3)

1. The utility model provides a big section inclined shaft open groove section high strength built-up plate which characterized in that: including the inner formword and set up in the exterior sheathing in the inner formword outside, still be equipped with arc ligature reinforcing bar between inner formword and the exterior sheathing, the inner formword is assembled by many built-up templates and is formed, and every built-up template comprises four landing legs and nine block combination arches, the exterior sheathing includes lath and nine centimetre boards, the lath is through nine centimetre boards and extension bolt fixed connection to on the inner formword.

2. The high-strength combined template for the open groove section of the large-section inclined shaft according to claim 1, wherein: the edge of each combined arch plate is provided with a connecting lug, and two adjacent combined arch plates are fixedly connected through bolts penetrating through the lugs.

3. The high-strength combined template for the open groove section of the large-section inclined shaft according to claim 2, wherein: every landing leg all is equipped with the connecting hole on horizontal and the vertical direction, can consolidate through the connecting rod of wearing to locate in the connecting hole between the adjacent landing leg, and the horizontal connecting hole of landing leg can be through the stock anchor to the country rock on.

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