CN206329353U - A kind of simple light hydraulic support for Sub-Level Caving coal mining activity - Google Patents

Abstract

A kind of simple light hydraulic support for Sub-Level Caving coal mining activity, including base plate, lower flat board, upper backup pad, support reinforcing structure, coal discharge outlet support adjustment mechanism and the jacking cylinder for being vertically arranged more than four on base plate, connected between lower flat board lower surface and jacking cylinder upper end by first axle, upper backup pad is set in parallel in above lower flat board, and support reinforcing structure setting is between upper backup pad and lower flat board；Coal discharge outlet support adjustment mechanism is arranged on base plate and on the outside of jacking cylinder；Upper and the next two coal discharge outlets are set to carry out Sub-Level Caving coal-mining method on a support using the utility model, a referred to as frame dibit Sub-Level Caving coal-mining method, effectively adapt to the mechanical mining in the corner field with "nine squares" and medium and small field with "nine squares" of large-scale mine, it is adapted to bigger Coal Seam Thickness Change, realize the higher rate of extraction, back production efficiency is improved, can effectively prevent that support from damaging and large area roof fall.

Description

A kind of simple light hydraulic support for Sub-Level Caving coal mining activity

Technical field

The utility model belongs to safety of coal mines coal-mining technique field, more particularly to a kind of letter for Sub-Level Caving coal mining activity Easy light hydraulic support.

Background technology

At present, in coal enterprise, when coal seam is thicker in field with "nine squares" and top coal is easily broken, in order to improve production efficiency and coal Recovery ratio, generally carries out resource exploitation using Sub-Level Caving coal-mining method.Sub-Level Caving coal-mining method, is substantially the edge in high seam Bottom arrange a 2~3m of mining height coal wall, carry out back production with conventional method, using mine pressure effect or Paving manually to loosen method, make crushing voerhead coal above support into after a prose style free from parallelism by support rear（Top）Release, and via scraper plate Conveyer transports working face.But, in some medium and small colliery enterprise fields with "nine squares" or large coal mine enterprise corner field with "nine squares", because coal seam is thick Degree is changed greatly, relatively difficult using large-scale mining, high cost.In order to improve production efficiency and coal recovery rate, lead to Resource exploitation is carried out frequently with light-duty simple rack Sub-Level Caving coal-mining method.Existing caving coal technology is as follows：

Existing caving coal technology is as follows：Coal discharge outlet is arranged on the tail end bottom of simple rack, generally using single-wheel, interval, Many mouthfuls put coal, since the haulage way of coal seam, carry out, first put on the odd numbers support such as 1#, 3#, 5# to tailgate direction successively Coal is pushed up, coal discharge outlet is closed after seeing certain cash, leaves larger back coal；A delayed segment distance is put on the even numbers support such as 2#, 4#, 6# Top coal, a spheroid is released in the back coal that will be left behind.Such a process for stoping shortcoming：

（1）Poor is adapted to irregular coal seam, coal seam is thicker（More than 6m）When, part top coal is not put not come out, and causes back production Rate is low.

（2）When coal seam is thicker, back production is dangerous, and spoil falling speed is fast, and intense impact support, accident is more frequent.

（3）Light-duty simple rack stress is unstable, and the support strength of the supporting plate of cradle top is relatively low, easily by top coal pressure It is curved, and less stable, the sinking of support front end is easily caused, afterbody is upwarped, move Jia difficulties, lengthen working hours, add Labor strength.

Thus, it is necessary to provide a kind of modified the light-duty frame twoport Sub-Level Caving coal-mining method of simple rack one, on overcoming State defect.

Utility model content

In order to solve the weak point in existing pre-stress fibre sheet material stretching end anchoring process, the utility model is provided It is a kind of it is safe and reliable, can be directed to and be more than that the thick coal seams of 6m be exploited, support strength is high, good stability be used for Sub-Level Caving coal mining The simple light hydraulic support of operation.

To achieve the above object, concrete scheme of the present utility model is as follows：It is a kind of to be used for the simple of Sub-Level Caving coal mining activity Light hydraulic support, including base plate, lower flat board, upper backup pad, support reinforcing structure, coal discharge outlet support adjustment mechanism and it is vertically arranged bottom The jacking cylinder of more than four on plate, is connected between lower flat board lower surface and jacking cylinder upper end by first axle, upper support Plate is set in parallel in above lower flat board, and support reinforcing structure setting is between upper backup pad and lower flat board；Coal discharge outlet support regulation Mechanism is arranged on base plate and on the outside of jacking cylinder；

Coal discharge outlet support adjustment mechanism includes lower end, and vertically the fixed lifting being located on base plate drives oil cylinder, interior lead column With outer lead column, interior lead column and outer lead column are equipped with two, and an interior lead column and an outer lead column are located at base plate Edge side, another interior lead column and another outer lead column are located at the edge opposite side of base plate, interior lead column and outer guiding Post is fixedly connected between upper end by connecting plate, and tilt prop, interior lead column are provided between interior lead column lower inside and base plate It is provided with to be vertically provided with to rotate on the outside of gathering sill, waste rock board on the inside of waste rock board, outer lead column between outer lead column and sets There is the directive wheel rolled along along gathering sill, lifting driving oil cylinder is located on the inside of waste rock board, lifting driving cylinder upper end and waste rock board Connected, be hinged between lifting driving cylinder upper end and link inside bottom by second hinge by link between inner side, It is fixedly connected on the outside of link with waste rock board inner surface.

Support reinforcing structure includes at least three steel pipes be arrangeding in parallel, and steel pipe top is welded with upper backup pad lower surface, Steel pipe bottom is welded with lower flat board upper surface, and the inside at every steel pipe two ends is provided with a positioning connection structure；Each Positioning connection structure includes radius rod and located lateral bar, and radius rod is provided with least five and is parallel to each other and sets Put, the lower end of every radius rod is fixedly connected with steel pipe lower inner wall；The upper end of every radius rod is fixed to be connected It is connected between a centring ring, two neighboring centring ring, passes through horizontal stroke between two centring rings of both sides and steel pipe side interior wall Connected to locating rod, all located lateral bars arrange that located lateral bar is vertical with radius rod in straight line；Same Bar connecting between two positioning connection structures in steel pipe by corresponding inserted into centring ring, reinforcing bar is rolled at centring ring Hook is curved, steel pipe two ends set in closure plate, steel pipe and are filled with concrete mortar.

Using the utility model Sub-Level Caving coal-mining method, comprise the following steps：

1）, using fully-mechanized mining working gallery deep hole and shallow bore hole, detection of coal seam thickness change, and draw coal seam thickness figure；

2）, process support reinforcement structure on the ground：Not all isometric 5 piece of longitudinal direction etc. are first welded in steel pipe lower inner wall The radius rod of horizontal range, the length of locating rod is both less than the radius of steel pipe longitudinally in each, while to ensure all indulge To locating rod upper end line point-blank, then weld centring ring successively in the upper end of radius rod, finally again Between two neighboring centring ring, centring ring and steel pipe walls branch between by weld located lateral bar connect it is in alignment, then Using the centring ring corresponding to five reinforcing bars through two positioning connection structures, and the bending at centring ring by reinforcing bar two ends Into hook, upper plugging plate then is welded at steel pipe two ends, injected hole is open in steel pipe top, coagulation is injected into steel pipe by injected hole Soil sand is starched, while concrete mortar solidifies, the first axle in the welding of lower flat board lower surface, after concrete mortar solidification, Some steel pipe uniform parallels are placed on lower flat board and steel pipe is welded as a whole with lower flat board upper surface, then in steel pipe Upper backup pad is placed at top, and steel pipe is welded as a whole with upper backup pad lower surface；

3）, the simple light hydraulic support described in some groups transported in fully-mechanized mining working gallery and installed, along gallery Length direction be sequentially arranged simple light hydraulic support, and every group of simple light hydraulic support is numbered in order：1#, 2#, 3# ... n#, make the side wall with gallery on the outside of two outer lead columns of the coal discharge outlet support adjustment mechanism of each simple light hydraulic support Contact, starts jacking cylinder and upper backup pad is contacted with top coal seam lower surface and has certain pressure, due to lower flat board and upper branch The support reinforcing structure set between fagging, makes upper backup pad keep good support flatness；

4）, according to the coal seam thickness figure of drafting, be more than 6m sections in thickness, first implement it is upper put coal, now waste rock board is located at Formed on the right side of the bottom of interior lead column and outer lead column, waste rock board upper edge, lower flat board between lower surface and two outer lead columns Upper coal discharge outlet；Caving mode puts coal according to interval, order, equivalent, on the simple light hydraulic support of odd numbers of first putting 1#, 3#, 5#, 7# ... The top coal of side, then put 2#, 4#, 6#, 8# ... putting at the top coal above the simple light hydraulic support of even numbers, every group of simple light hydraulic support Coal amount is 0~3m³Or see that the thickness in the coal seam of cash, i.e. thickness more than 6m sections is reduced to and the thinner seam thickness on the thickness figure of coal seam After degree is consistent, start lifting driving oil cylinder, lifting driving oil cylinder is moved up upwardly through link driving waste rock board, waste rock board On directive wheel moved up along the gathering sill in outer lead column, the upper coal discharge outlet on top is blocked, completes upper to put coal process；

5）, waste rock board lower edge, lower coal discharge outlet is formed on the right side of base plate between upper surface and two outer lead columns, from transferring coal Mouthful place using single-wheel, interval, many mouthfuls put coal, since the haulage way of coal seam, successively to tailgate direction progress, first put 1#, Top coal on the simple light hydraulic support of 3#, 5#, 7# ... odd numbers, is shown in after certain cash and closes lower coal discharge outlet, leave larger back coal； Released in top coal above a delayed segment distance puts 2#, 4#, 6#, 8# ... the simple light hydraulic support of even numbers, the back coal that will be left behind One spheroid, completes coal mining activity.

Using above-mentioned technical proposal, simple light hydraulic support of the present utility model between upper backup pad and lower flat board due to setting The support reinforcing structure put, support reinforcing structure sets in steel pipe reinforced concrete structure, steel pipe master using many steel pipes It is used to contain and the high-strength concrete mortar inside lock ring, making concrete, pressure possesses higher resistance to compression from top to bottom Intensity.After the solidification of high-strength concrete mortar under the axial direction of steel pipe and hoop constraint, compression strength is greatly improved.

Reinforcing bar through centring ring by being arranged in steel pipe.The number of the centring ring of each positioning connection structure is equal to required The total number for the reinforcing bar wanted.Because reinforcing bar has good tensile strength and ductility.Reinforcing bar is arranged in the bottom of steel pipe, reinforcing bar Insertion is that, in order to improve the tensile strength of support frame, the rigidity of reduction support frame prevents that support frame from locally tensile shear occurring Destruction and brittle break, improve the overall stability of support.The intervention of reinforcing bar simultaneously can also improve the overall ductility of support frame, prevent Only in high confining pressure lower bracing frame brittle break.The length of locating rod is both less than the radius of steel pipe longitudinally in each, is easy to save certain Master Cost.

Centring ring reinforcing bar in construction just can smoothly insert position predetermined in steel pipe, preferably play the tension of reinforcing bar Intensity, and the place of the centring ring at steel pipe two ends is bent into hook, so can fully improve the tensile property of support and steady It is qualitative.

Waste rock board is lifted using hydraulic-driven, and is rolled by directive wheel along gathering sill, so reduces the resistance moved up and down Power.It is fixedly connected, is set between interior lead column lower inside and base plate by connecting plate between interior lead column and outer lead column upper end Tilt prop is equipped with, the stability in vertical direction of interior lead column and outer lead column so can be fully improved, further, since in oil The base plate that cylinder bottom portion is set, lifts support strength, can so avoid the larger slotting bottom of cylinder force.

In summary, the utility model for the thicker section Sub-Level Caving of irregular coal seam mine there is provided one kind it is safe efficient, The support and coal-mining method of strong operability, i.e., set upper and the next two coal discharge outlets to carry out Sub-Level Caving coal mining on a support Method（A referred to as frame dibit Sub-Level Caving coal-mining method）.By methods described when unstable high seam carries out back production, Ke Yiyou Effect ground adapts to the mechanical mining in the corner field with "nine squares" and medium and small field with "nine squares" of large-scale mine, can effectively adapt to bigger coal seam thickness and become Change, realize the higher rate of extraction, improve back production efficiency, can effectively prevent that support from damaging and large area roof fall.

Brief description of the drawings

Fig. 1 is structural representation of the present utility model；

Fig. 2 is the transverse sectional view of steel pipe in Fig. 1；

Fig. 3 is that the utility model carries out putting schematic diagram when coal is mined by upper coal discharge outlet；

Fig. 4 is the schematic diagram in cross section in Fig. 3；

Fig. 5 is that the utility model carries out putting schematic diagram when coal is mined by lower coal discharge outlet；

Fig. 6 is the schematic diagram in cross section in Fig. 5.

Embodiment

As shown in figures 1 to 6, a kind of simple light hydraulic support for Sub-Level Caving coal mining activity of the present utility model, including base plate 1st, lower flat board 2, upper backup pad 3, support reinforcing structure, coal discharge outlet support adjustment mechanism and more than four are vertically arranged on base plate 1 Jacking cylinder 4, connected by first axle 5 between the lower lower surface of flat board 2 and jacking cylinder 4 upper end, upper backup pad 3 is parallel to be set Put in the lower top of flat board 2, support reinforcing structure setting is between upper backup pad 3 and lower flat board 2；Coal discharge outlet support adjustment mechanism is set Put on base plate 1 and positioned at the outside of jacking cylinder 4.

Coal discharge outlet support adjustment mechanism includes lower end, and vertically the fixed lifting being located on base plate 1 drives oil cylinder 6, interior guiding Post 7 and outer lead column 8, interior lead column 7 and outer lead column 8 are equipped with two, an interior lead column 7 and an outer lead column 8 In the edge side of base plate 1, another interior lead column 7 and another outer lead column 8 are inside led positioned at the edge opposite side of base plate 1 It is fixedly connected, is set between the interior lower inside of lead column 7 and base plate 1 by connecting plate 9 between post 7 and the upper end of outer lead column 8 There is tilt prop 10, waste rock board 11 is provided between interior lead column 7 and outer lead column 8, the outer inner side of lead column 8 is vertically provided with Gathering sill 12, the outside of waste rock board 11 rotates the directive wheel 13 for being provided with and being rolled along in gathering sill 12, and lifting driving oil cylinder 6 is located at gear cash The inner side of plate 11, is connected between lifting driving cylinder upper end and the inner side of waste rock board 11 by link 14, lifting driving oil cylinder 6 upper end It is hinged between the inside bottom of link 14 by second hinge 15, the outside of link 14 is fixed with the inner surface of waste rock board 11 to be connected Connect.

Support reinforcing structure includes at least three steel pipes 16 be arrangeding in parallel, the top of steel pipe 16 and the lower surface of upper backup pad 3 Welding, the bottom of steel pipe 16 is welded with the lower upper surface of flat board 2, and the inside at the every two ends of steel pipe 16 is provided with one and is located by connecting Structure；Each positioning connection structure includes radius rod 17 and located lateral bar 18, and radius rod 17 is provided with least five Root and arranged in parallel, the lower end of every radius rod 17 is fixedly connected with the lower inner wall of steel pipe 16；Determine every longitudinal direction The upper end of position bar 17 has been fixedly connected between a centring ring 19, two neighboring centring ring 19, two centring rings 19 of both sides It is connected between the side interior wall of steel pipe 16 by located lateral bar 18, all located lateral bars 18 are arranged in straight line, Located lateral bar 18 is vertical with radius rod 17；Inserted between two positioning connection structures in same steel pipe 16 by correspondence The reinforcing bar 20 being set in centring ring 19 is connected, and reinforcing bar 20 is bent into hook at centring ring 19, and the two ends of steel pipe 16 set closure plate 22, steel Concrete mortar 21 is filled with pipe 16.

The method that Sub-Level Caving coal mining activity is carried out using the utility model, is comprised the following steps：

1）, using fully-mechanized mining working gallery deep hole and shallow bore hole, detection of coal seam thickness change, and draw coal seam thickness figure；

2）, process support reinforcement structure on the ground：Not all isometric 5 piece of longitudinal direction are first welded in the lower inner wall of steel pipe 16 Etc. the radius rod 17 of horizontal range, the length of locating rod 17 is both less than the radius of steel pipe 16 longitudinally in each, while to ensure The line of all upper ends of radius rod 17 point-blank, then welds positioning successively in the upper end of radius rod 17 Circle 19, finally again between two neighboring centring ring 19, centring ring 19 and the wall of steel pipe 16 branch between by welding located lateral bar 18 connections are in alignment, then using five reinforcing bars 20 through the centring ring 19 corresponding to two positioning connection structures, And the two ends of reinforcing bar 20 are bent into hook at centring ring 19, upper plugging plate 22 then is welded at the two ends of steel pipe 16, at the top of steel pipe 16 Injected hole is open, concrete mortar 21 is injected into steel pipe 16 by injected hole, while concrete mortar 21 solidifies, under The upper first axle 5 of the lower surface of flat board 2 welding, after concrete mortar 21 solidifies, some uniform parallels of steel pipe 16 are placed into down It is welded as a whole on flat board 2 and by steel pipe 16 with the lower upper surface of flat board 2, upper backup pad 3 is then placed at the top of steel pipe 16, and will Steel pipe 16 is welded as a whole with the lower surface of upper backup pad 3；

3）, as shown in Figure 3 and Figure 4, the simple light hydraulic support 23 described in some groups is transported in fully-mechanized mining working gallery And installed, simple light hydraulic support 23 is sequentially arranged along the length direction of gallery, and to every group of simple light hydraulic support 23 by suitable Sequence is numbered：1#, 2#, 3# ... n#, make two of the coal discharge outlet support adjustment mechanism of each simple light hydraulic support 23 to lead outside To the outside of post 8 and the sidewall contact of gallery, start jacking cylinder 4 and upper backup pad 3 is contacted with pushing up coal seam lower surface and has one Constant-pressure, due to the support reinforcing structure set between lower flat board 2 and upper backup pad 3, makes upper backup pad 3 keep good support Flatness；

4）, according to the coal seam thickness figure of drafting, be more than 6m sections in thickness, first implement it is upper put coal, now waste rock board 11 In the bottom of interior lead column 7 and outer lead column 8, the upper edge of waste rock board 11, the right side lower surface of lower flat board 2 and two outer lead columns 8 Between form upper coal discharge outlet 24；Caving mode puts coal according to interval, order, equivalent, and first putting 1#, 3#, 5#, 7# ..., odd numbers is simple The top coal of the top of light hydraulic support 23, then put 2#, 4#, 6#, 8# ... the top coal of the simple top of light hydraulic support 23 of even numbers, every group is simple Coal amount is put for 0~3m at light hydraulic support 23³Or see that the thickness in the coal seam of cash, i.e. thickness more than 6m sections is reduced to and coal seam thickness After thinner seam consistency of thickness on figure, start lifting driving oil cylinder 6, lifting driving oil cylinder 6 drives upwardly through link 14 Waste rock board 11 is moved up, and the directive wheel 13 on waste rock board 11 is moved up along the gathering sill 12 in outer lead column 8, by top Upper coal discharge outlet 24 is blocked, and completion is upper to put coal process；

5）, as shown in Figure 5 and Figure 6, shape between the lower edge of waste rock board 11, the right side upper surface of base plate 1 and two outer lead columns 8 Into lower coal discharge outlet 25, at lower coal discharge outlet 25 using single-wheel, interval, many mouthfuls put coal, since the haulage way of coal seam, successively to return Wind gallery direction is carried out, the top coal on the simple light hydraulic support 23 of odd numbers of first putting 1#, 3#, 5#, 7# ..., is seen under being closed after certain cash Coal discharge outlet 25, leaves larger back coal；The simple top of light hydraulic support 23 of a delayed segment distance puts 2#, 4#, 6#, 8# ... even numbers Top coal, a spheroid is released in the back coal that will be left behind, coal mining activity is completed.

Other accompanying drawings in the utility model in Fig. 3-Fig. 6, which are marked, is respectively：26- coal seams；27- spoils layer；29- loose coals Layer；It is haulage way 30 close to the tunnel of the simple light hydraulic supports of 1#；It is haulage way 30 close to the tunnel of the simple light hydraulic supports of n#.

Simple light hydraulic support 23 of the present utility model is due to the support reinforcing set between upper backup pad 3 and lower flat board 2 Structure, support reinforcing structure sets the concrete structure of reinforcing bar 20 using many steel pipes 16, and in steel pipe 16, and steel pipe 16 is main to be used In the high-strength concrete mortar 21 contained and inside lock ring, making concrete, pressure possesses higher pressure resistance from top to bottom Degree.After the solidification of high-strength concrete mortar 21 under the axial direction of steel pipe 16 and hoop constraint, compression strength is greatly improved.

Reinforcing bar 20 through centring ring 19 by being arranged in steel pipe 16.The number of the centring ring 19 of each positioning connection structure Equal to the total number of required reinforcing bar 20.Because reinforcing bar 20 has good tensile strength and ductility.Arrange reinforcing bar 20 in steel The bottom of pipe 16, the insertion of reinforcing bar 20 is that, in order to improve the tensile strength of support frame, the rigidity of reduction support frame prevents support frame Locally there is tensile shear destruction and brittle break, improving the overall stability of support.The intervention of reinforcing bar 20 can also be carried simultaneously The overall ductility of high carriage, is prevented in high confining pressure lower bracing frame brittle break.The length of locating rod 17 is both less than longitudinally in each The radius of steel pipe 16, is easy to save certain Master Cost.

The reinforcing bar 20 in construction of centring ring 19 just can smoothly insert position predetermined in steel pipe 16, preferably play reinforcing bar 20 tensile strength, and the place of the centring ring 19 at the two ends of steel pipe 16 is bent into hook, so can fully improve support Tensile property and stability.

Waste rock board 11 is lifted using hydraulic-driven, and is rolled by directive wheel 13 along gathering sill 12, is so reduced and is moved down Dynamic resistance.Be fixedly connected between interior lead column 7 and outer lead column 8 upper end by connecting plate 9, the interior lower inside of lead column 7 with Tilt prop 10 is provided between base plate 1, the stabilization in vertical direction of interior lead column 7 and outer lead column 8 so can be fully improved Property, further, since the base plate 1 set in oil cylinder bottom, lifts support strength, it can so avoid the larger slotting bottom of cylinder force.

Above example is only used to illustrative and not limiting the technical solution of the utility model, although with reference to above-described embodiment pair The utility model is described in detail, it will be understood by those within the art that：The utility model can still be entered Row modification or equivalent, without departing from any modification or partial replacement of spirit and scope of the present utility model, it all should Cover among right of the present utility model.

Claims (2)

1. a kind of simple light hydraulic support for Sub-Level Caving coal mining activity, it is characterised in that：Including base plate, lower flat board, upper support Under plate, support reinforcing structure, coal discharge outlet support adjustment mechanism and the jacking cylinder for being vertically arranged more than four on base plate, lower flat board Connected between surface and jacking cylinder upper end by first axle, upper backup pad is set in parallel in above lower flat board, support reinforcing Structure setting is between upper backup pad and lower flat board；Coal discharge outlet support adjustment mechanism is arranged on base plate and outside jacking cylinder Side；

Coal discharge outlet support adjustment mechanism includes the lower end vertically fixed lifting driving oil cylinder being located on base plate, interior lead column and outer Lead column, interior lead column and outer lead column are equipped with two, and an interior lead column and an outer lead column are located at the edge of base plate Side, another interior lead column and another outer lead column are located in the edge opposite side of base plate, interior lead column and outer lead column It is fixedly connected between end by connecting plate, is provided with tilt prop between interior lead column lower inside and base plate, interior lead column and outer It is provided with to be vertically provided with to rotate on the outside of gathering sill, waste rock board on the inside of waste rock board, outer lead column between lead column and is provided with edge The directive wheel rolled in gathering sill, lifting driving oil cylinder is on the inside of waste rock board, lifting driving cylinder upper end and waste rock board inner side Between connected by link, lifting driving cylinder upper end and link inside bottom between be hinged by second hinge, connect It is fixedly connected on the outside of frame with waste rock board inner surface.

2. a kind of simple light hydraulic support for Sub-Level Caving coal mining activity according to claim 1, it is characterised in that：Support Reinforcement structure includes at least three steel pipes be arrangeding in parallel, and steel pipe top is welded with upper backup pad lower surface, and steel pipe bottom is with Flat board upper surface is welded, and the inside at every steel pipe two ends is provided with a positioning connection structure；Each positioning connection structure Include radius rod and located lateral bar, radius rod is provided with least five and arranged in parallel, every longitudinal direction is determined The lower end of position bar is fixedly connected with steel pipe lower inner wall；The upper end of every radius rod has been fixedly connected with a positioning Circle, is connected between two neighboring centring ring, between two centring rings of both sides and steel pipe side interior wall by located lateral bar, All located lateral bars arrange that located lateral bar is vertical with radius rod in straight line；Two in same steel pipe Bar connecting between positioning connection structure by corresponding inserted into centring ring, reinforcing bar is bent into hook, steel pipe at centring ring Two ends set in closure plate, steel pipe and are filled with concrete mortar.