CN109372553B - Belt template assembly for primary support mould spraying of tunnel - Google Patents
Belt template assembly for primary support mould spraying of tunnel Download PDFInfo
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- CN109372553B CN109372553B CN201811420637.0A CN201811420637A CN109372553B CN 109372553 B CN109372553 B CN 109372553B CN 201811420637 A CN201811420637 A CN 201811420637A CN 109372553 B CN109372553 B CN 109372553B
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- 238000005507 spraying Methods 0.000 title claims abstract description 50
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 45
- 239000010959 steel Substances 0.000 claims abstract description 45
- 230000000694 effects Effects 0.000 claims abstract description 10
- 239000011435 rock Substances 0.000 claims description 3
- 239000004567 concrete Substances 0.000 abstract description 26
- 238000010276 construction Methods 0.000 abstract description 18
- 239000007921 spray Substances 0.000 abstract description 17
- 238000002347 injection Methods 0.000 abstract description 2
- 239000007924 injection Substances 0.000 abstract description 2
- 238000005096 rolling process Methods 0.000 abstract description 2
- 230000007246 mechanism Effects 0.000 description 12
- 210000000245 forearm Anatomy 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 230000009471 action Effects 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 238000009412 basement excavation Methods 0.000 description 4
- 238000009415 formwork Methods 0.000 description 3
- 239000011378 shotcrete Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/102—Removable shuttering; Bearing or supporting devices therefor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a belt template assembly for tunnel primary support template spraying, which comprises a flexible annular belt template and a template support, wherein a plurality of belt support rollers are transversely arranged on the front side of the template support in parallel, the belt template is sleeved on the belt support rollers, and the front end belt template can be clung to more than two adjacent steel arches, so that a die cavity to be poured is formed between the belt template and the steel arches. The shower nozzle can directly spray quick-setting concrete from last to the die cavity, and the belt template has not only played the effect of template, has also played the effect of the walking belt that is the belt template subassembly for in rolling the belt template from down upwards continuous motion, constantly form new die cavity, the shower nozzle also can carry out continuous injection pouring, has effectively improved the construction quality that the mould spouts, and the work progress does not have the concrete resilience, has reduced the accelerator quantity, has effectively improved the efficiency of construction.
Description
Technical Field
The invention belongs to the technical field of tunnel engineering equipment, and particularly relates to a belt template assembly for primary support template spraying of a tunnel, which is developed for temporary support slurry spraying in tunnel construction.
Background
Among existing construction machines, concrete sprayers (such as wet spray manipulators) are one type of construction machine that is relatively common. The working principle of the concrete sprayer is that the pre-mixed concrete mixture is conveyed to the nozzle of the sprayer by utilizing compressed air, and is sprayed to the sprayed surface at a high speed under the action of the compressed air, so that the concrete supporting layer is formed. The concrete spraying technology has wide application in various construction fields by a simple process.
Meanwhile, in the engineering construction of the traditional tunnel and the like needing temporary support on the excavation surface, the wet spraying manipulator mostly adopts a construction mode of directly spraying on the excavation surface, so that in order to ensure that the concrete supporting layer can meet the strength requirement in a certain time, a large amount of additive or accelerator is required to be added into the concrete, the sprayed concrete has high rebound rate, the sprayed concrete has at least 20% of concrete rebound, so that huge waste of building materials is caused, the on-site construction environment is deteriorated, the engineering cost is increased, and meanwhile, the temporary support structure of the direct spraying has the technical problems of insufficient strength and the like. The surface finish degree of the support after the support is formed is poor, and the surface of the support is required to be subjected to shaping treatment, so that the construction period is prolonged. Therefore, the development of a device capable of effectively reducing the rebound rate of guniting and improving the site construction environment is urgent.
Disclosure of Invention
The invention aims at: according to the belt template assembly for spraying the tunnel primary support mould, the mould cavity is formed between the belt template and the steel arch, and the spray head can directly spray quick-setting concrete from the upper direction to the mould cavity, so that the continuous belt template for spraying and pouring of the tunnel primary support is achieved, no concrete rebounds, the using amount of the quick-setting agent is reduced, and the construction efficiency is effectively improved.
The technical scheme of the invention is realized as follows: the utility model provides a tunnel preliminary bracing mould spouts with belt template subassembly, but whole installation is on the gyration big arm of mould spouting platform truck, including flexible annular belt template, template support, a plurality of belt backing rolls are transversely installed side by side to the front side of template support, and the belt template cover is established on the belt backing roll, and the front end belt template can hug closely adjacent more than two steel arches for form the die cavity that waits to pour between belt template, rock face and the steel arch.
The invention relates to a belt template assembly for spraying a tunnel primary support mould, which is characterized in that an upper turning roller and a lower turning roller are respectively arranged at the top end and the bottom end of the inner side of a belt template on a template support; the diameters of the upper and lower turning rollers are larger than the diameters of the belt supporting rollers.
The roller shaft of the upper turning roller or the lower turning roller is connected with a driving motor, and the turning roller with the driving motor can drive the belt template to rotate.
The belt template assembly for spraying the tunnel primary support template is characterized in that a tensioning main roller is arranged on the template support and positioned on the inner side of the rear end belt template, and the belt template can be pushed and stretched backwards to achieve the effect of tensioning the belt template.
The belt template assembly for spraying the tunnel primary support mould is characterized in that a tensioning auxiliary roller is respectively arranged on the template support and positioned above and below a tensioning main roller so as to be matched with the tensioning main roller to strengthen the tensioning effect.
The invention discloses a belt template assembly for primary support template spraying of a tunnel, which comprises rectangular side frames positioned at two sides, wherein an upper connecting beam and a lower connecting beam are arranged at the rear ends of the two side frames.
The belt template component for the tunnel primary support die spraying is characterized in that a belt supporting roller is fixed on side frames at two sides through supporting roller seats, each supporting roller seat comprises a seat plate and a perforated lug plate, the belt Kong Er plate is vertically fixed at the front side of the seat plate and used for fixing a roller shaft of the supporting roller, and the seat plate is fixed on the side frames through supporting cylinders.
The side frame comprises a front vertical beam and a rear vertical beam, an auxiliary vertical beam is fixed on the inner side of the rear vertical beam of the side frame, a cylinder body of the supporting cylinder is fixed on the auxiliary vertical beam, and a piston rod is fixed on the rear side of the seat plate.
The invention relates to a belt template component for tunnel primary support mould spraying, a support roller seat also comprises a guide shaft vertically connected to the rear side of a seat plate, the guide shaft is inserted in a guide shaft sleeve fixed on the front vertical beam of the side frame.
The invention relates to a belt template assembly for spraying a tunnel primary support mould, wherein a through hole which is communicated with an inner hole of a guide shaft sleeve is arranged at the joint of a side frame front vertical beam and the guide shaft sleeve, and a guide shaft can pass through the through hole to enter between the side frame front vertical beam and a side frame rear vertical beam.
The beneficial effects of the invention are as follows: through the tunnel preliminary bracing mould that provides spouts with belt template subassembly for form the die cavity between belt template and the two adjacent steel arches, the shower nozzle can be directly from last to spray quick-setting concrete in the die cavity, and annular belt template is under driving motor and the combined action of corresponding turning roll, can make the continuous rotatory of belt template, so make the belt template when hugging closely the steel arch, can easily roll in the vertical of steel arch, make the belt template play the effect of template not only, also played the effect of the walking belt as belt template subassembly, make the belt template in rolling follow down upwards continuous movement, constantly form new die cavity, the shower nozzle also can carry out continuous injection pouring, the construction quality of mould spouting has effectively been improved, and no concrete resilience, the accelerator quantity has been reduced, and construction efficiency has been effectively improved.
Drawings
FIG. 1 is a schematic illustration of a belt module of the present invention;
FIG. 2 is a schematic diagram of a belt module of the present invention;
FIG. 3 is a schematic view of a template holder of the present invention;
FIG. 4 is a schematic view of a formwork support of the present invention;
FIG. 5 is a second schematic view of a template holder of the present invention;
fig. 6 is an overall schematic diagram of the die-casting carriage of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present technology will be described in further detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in the figure, the belt template component for tunnel primary support template spraying can be integrally arranged on a rotary large arm of a template spraying trolley, and comprises a flexible annular belt template 2 and a template support 1, wherein a plurality of belt support rollers 3 are transversely arranged on the front side of the template support 1 side by side, the belt template 1 is sleeved on the belt support rollers 3, and the front end belt template 2 can be tightly attached to more than two adjacent steel arches, so that a mold cavity to be poured is formed among the belt template 2, a rock surface and the steel arches.
An upper turning roller 31 and a lower turning roller 32 are respectively arranged at the top end and the bottom end of the inner side of the belt template 2 on the template support 1; and the diameters of the upper turning roller 31 and the lower turning roller 32 are larger than the diameter of the belt supporting roller 3, and the front cambered surfaces of the upper turning roller 31 and the lower turning roller 32 and the belt supporting roller 3 are all kept flush. The template bracket 1 comprises rectangular side frames 11 positioned on two sides, and an upper connecting beam 12 and a lower connecting beam 13 are arranged at the rear ends of the two side frames 11. The upper and lower ends of the side frames 11 are respectively provided with an upper bracket 11a and a lower bracket 11b for fixing the upper and lower direction-changing rollers 31 and 32, respectively.
The roller shaft of the lower turning roller 32 is connected with a driving motor 321, and the lower turning roller 32 with the driving motor 321 can drive the belt template 2 to rotate in the forward direction or the reverse direction. In practical design, the driving motor can be connected with the upper turning roller 31 as well, so as to achieve the same technical effect.
The front end roller surfaces of the upper turning roller 31, the lower turning roller 32 and the belt supporting roller 3 positioned between the upper turning roller 31 and the lower turning roller 32 are integrally provided with radians consistent with the steel arch.
A tensioning main roller 33 is arranged on the template support 1 and positioned on the inner side of the rear-end belt template 2, and can push the belt template 2 backwards to achieve the effect of tensioning the belt template 2; further, on the template frame 1, a tensioning auxiliary roller 34 is respectively disposed above and below the tensioning main roller 33 to cooperate with the tensioning main roller 33 to strengthen the tensioning effect.
The belt backing roll 3 is fixed on both sides frame 11 through backing roll seat 4, and backing roll seat 4 includes first bedplate 41 and first foraminiferous otic placode 42, first foraminiferous otic placode 42 is fixed perpendicularly in the front side of first bedplate 41 for the roller of fixed backing roll 3, and first bedplate 41 is fixed on frame 11 through first supporting cylinder 43. The side frame 11 comprises a front vertical beam 111 and a rear vertical beam 112, an auxiliary vertical beam 14 is fixed on the inner side of the side frame rear vertical beam 112, a cylinder body of the first supporting cylinder 43 is fixed on the front side surface of the auxiliary vertical beam 14, and a piston rod is fixed on the rear side surface of the first seat board 41.
The support roller holder 4 further includes a first guide shaft 44 vertically connected to the rear side of the first seat plate 41, and the first guide shaft 44 is inserted into a first guide shaft sleeve 45 fixed to the side frame front vertical beam 111.
The connection part of the side frame front vertical beam 111 and the first guide shaft sleeve 45 is provided with a first through hole 111a communicated with the inner hole of the first guide shaft sleeve 45, and the first guide shaft 44 can pass through the first through hole 111a to enter between the side frame front vertical beam 111 and the side frame rear vertical beam 112. The compactness of the formwork support 1 is improved, and the stability of the whole formwork assembly is reduced because the first guide shafts 44 need to reach corresponding strokes, so that the support rollers 3 are too far forward.
The main roller seat 5 of the tensioning main roller 33, like the support roller seat 4, comprises a second seat plate 51, a second perforated lug 52, a second support cylinder 53 and a second guide shaft 54, the specific action of which is the same as in the support roller seat. However, the specific installation mode is different, the main roller seat 5 of the tensioning main roller 33 is installed at the middle part of the two side frames 11, and the front side of the front vertical beam 111 of the side frames is welded with the L-shaped seat plate 56 for fixing the second supporting air cylinder 53 of the main roller seat 5. The L-shaped seat plate 56 includes a fixing plate 56a and a connection plate 56b, the fixing plate 56a is directly and vertically welded to the front side of the side frame front vertical beam 111, and the connection plate 56b is parallel to the front side of the side frame front vertical beam 111 and extends between the two side frames 11 such that the free end thereof exceeds the inner side of the connected side frame front vertical beam 111.
Further, the second seat plate 51 of the main roller seat 5 is located outside the rear side of the side frame rear vertical beam 112, the second belt Kong Er plate 52 is fixed on the rear side of the second seat plate 51, the auxiliary vertical beam 14 is provided with a break 141 at a position opposite to the tensioning main roller 33 so as to divide each auxiliary vertical beam 14 into two sections, the second supporting cylinder 53 is fixed on the connecting plate 56b through the break 141, and the piston rod is fixed on the front side of the second seat plate 51.
Further, the second guide shaft sleeve 55 is fixed between the side frame front vertical beam 111 and the side frame rear vertical beam 112 corresponding to the position of the second guide shaft 54 of the main roller seat 5, and a second through hole 111b and a third through hole 112a which are communicated with the inner holes of the second guide shaft sleeve 55 are arranged at corresponding positions on the side frame front vertical beam 111 and the side frame rear vertical beam 112. Here, the second guide bush 55 also serves to reinforce the strength of the side frame 11.
The tension sub roller 34 is installed at the front side of both ends of the break 141 of the auxiliary girder 14 through a sub roller seat 341 corresponding to the tension main roller 33. The sub roller seat 341 only includes the third seat plate 341a and the third perforated lug plate 341b, and the cylinder and the guide shaft are not connected.
The upper connecting beams 12 are two, the middle parts of the two upper connecting beams 12 are fixedly provided with template hinge supports 15, the template hinge supports 15 are hinged with the template supports 6, and the template support 1 is fixed at the front end of a rotary large arm of the die spraying trolley through the template supports 6. A pitching oil cylinder 7 is connected between the middle part of the lower connecting beam 13 and the template support 6 and is used for adjusting the pitching angle of the template support 1.
The template support 6 comprises a support elbow 61, a support connecting plate 62 and a template connecting seat 63, wherein the support connecting plate 62 is fixed at the horizontal top end of the support elbow 61, and the template support 6 can be fixed on the front end of the rotary large arm of the trolley through the support connecting plate 62.
The template connecting seat 63 comprises a template horizontal seat plate 63a and a template vertical seat plate 63b, the template horizontal seat plate 63a is fixed at the vertical bottom end of the support elbow 61, and two template vertical seat plates 63b are respectively fixed at two sides of the template horizontal seat plate 63a and are connected with the template hinge support 15 through a rotating shaft.
A cylinder body hinge support 64 is arranged between the two template vertical seat plates 63b at the bottom of the template horizontal seat plate 63a so as to be connected with the cylinder body of the pitching oil cylinder 7; a piston rod hinge support 16 of the pitch cylinder 7 is provided on the back of the wet-jet template 8 and below said template hinge support 15 to connect the piston rod of the pitch cylinder 7.
Fig. 6 shows a specific structure of the die spraying trolley, which comprises a trolley frame I, a sliding frame II, a sliding trolley III, a large arm turntable IV, a rotary large arm V, a forearm mechanism VI and a pumping mechanism VII. The forearm mechanism VI is rotatably arranged at the front end part of the rotary large arm V through the forearm connecting seat VI-1, under the drive of the rotary large arm V, a wet spray nozzle (not shown in the figure) can be arranged at the top of the forearm mechanism VI through a nozzle moving assembly mechanism (not shown in the figure) under the action of the forearm mechanism VI, and the belt template assembly is arranged at the front end of the forearm mechanism VI through the template support 6, so that the wet spray nozzle can be kept above the top of the belt template assembly, and the belt template assembly and the wet spray nozzle can integrally move or rotate along with the forearm mechanism VI at any time. The wet spraying nozzle can longitudinally move along the forearm mechanism VI, can transversely move on the nozzle moving assembly mechanism, can independently adjust the pitching angle and can automatically rotate so as to meet various operation requirements in the die spraying process.
The tail end of the rotary large arm V is arranged on a large arm rotary table IV, and the large arm rotary table IV comprises a vertical rotating component which can drive the rotary large arm V to rotate back and forth in a vertical plane; the large arm turntable IV further comprises a horizontal rotating assembly which can drive the rotary large arm V to horizontally rotate.
The vertical rotating component of the large arm turntable IV is a gear rotating component, and can drive the maximum rotating angle of the rotary large arm V in a vertical plane to exceed 240 degrees. Compared with the traditional large arm of the engineering vehicle which is supported by the hydraulic cylinder and provides rotary power, the rotation angle of the traditional large arm at one side can only reach about 60 degrees, and the full-angle die spraying requirement of the die spraying trolley on each section of a tunnel can not be met.
The trolley frame I is longitudinally provided with a sliding frame II along the trolley body, the sliding frame II is provided with a sliding trolley III, and the large-arm turntable IV is rotatably arranged on the sliding trolley III; the sliding trolley III carries the large-arm turntable IV and can slide along the longitudinal direction of the sliding frame II.
The distance that the sliding trolley III can longitudinally slide on the sliding frame II is 2-3 times greater than the distance between two adjacent rows of steel arches. Specifically, the length of the sliding frame ii may be equal to the width of three steel arches, that is, equal to the distance between two steel arches on the outer sides of the adjacent four steel arches (in terms of engineering practice, the distance between two adjacent steel arches is generally 1 meter, and the length of the sliding frame ii is 3 meters), so that the moving distance of the sliding trolley iii on the sliding frame ii may be ensured to at least reach the distance between two steel arches on the outer sides of the adjacent three steel arches. The width of the main belt template 2 can only transversely cover two adjacent steel arches, so that in conventional tunnel construction, the die spraying construction of three continuous wet spraying templates can be met under the condition of not moving vehicles, and the problem that the progress of construction is affected due to frequent vehicle moving is avoided. While for wider wet spray forms, such as the three of applicant's wet spray forms may cover three transverse cavities formed by adjacent four consecutive rows of steel arches, such a design is not necessary. Of course, the length of the sliding frame II is not limited to be equal to the width of the three steel arches, and the sliding frame II can be processed longer along with the length of the trolley frame I theoretically, so that the purpose of single vehicle moving and wider tunnel surface spraying can be realized. The mould spraying trolley further comprises a pumping mechanism VI which can automatically convey concrete wet spraying materials to the wet spraying nozzle.
The workflow of the belt template assembly is as follows: in the construction process, the rotary large arm, the template support and the like are regulated to enable the belt template to be clung to the bottommost ends of two adjacent steel arches, a die cavity with the height of about one meter (the upper and lower heights of the belt template) is formed between the belt template and the two steel arches, the angle of a spray head is regulated to start spraying concrete into the die cavity, in the spraying process, the more the concrete is accumulated, after the initial setting of the concrete, the rotary large arm drives the template support to start to move upwards along the steel arches, and the motor is driven to rotate forwards while the front arm mechanism moves, the front end of the belt template is driven to rotate downwards, and the rotation speed of the belt template is kept consistent with the movement speed of the template support, so that the belt template corresponds to a walking crawler on the steel arches; when moving, continuously adjusts the telescopic end passing through the rotary large arm and combines the adjustment of the pitching oil cylinder, so that the two transverse ends of the belt template are always kept close to the two steel arches, thus continuously forming a new mold cavity, simultaneously, the spray head continuously sprays concrete, continuously carries out mold spraying support, when reaching the top of the tunnel section, after the single-side spraying of the tunnel section is completed, when the final initial setting is achieved, the template support and the belt template are recovered through the rotary large arm, and the continuous primary support without rebound and dust is realized.
The method for carrying out primary support die spraying of the tunnel by utilizing the belt template assembly comprises the following steps:
s1: the mould spouts the platform truck and advances to waiting to spout tunnel section times of watering, starts the platform truck, opens the gyration big arm, and gyration big arm takes template support and belt template to be close the bottom of two adjacent steel arches in one side of excavation face.
S2: the template support is tightly attached to two steel arches from the bottom with the belt template, and forms a die cavity to be poured with the steel arches.
S3: and adjusting the position and angle of the spray head, opening the spray head, and spraying quick-setting concrete downwards from an opening at the top of the transverse die cavity to finish pouring of the initial concrete.
S4: after the initial concrete at the bottom of the die cavity is initially set, under the action of the rotary large arm, the template support moves from bottom to top along the steel arches slowly with the belt template, in the moving process, the front end face of the belt template is always kept to be clung to the two steel arches simultaneously, so that a new die cavity is continuously formed, and the spray head continuously sprays quick setting concrete into the newly formed die cavity until reaching the vault, so that the primary support pouring of the single-side excavation face of the die cavity is completed.
And S5, after the top concrete is solidified, the large arm is rotated to retract the template support and the belt template, and the template support and the belt template are horizontally rotated, so that the template support faces the other side of the same section of tunnel, and the steps S1-S4 are repeated to finish the primary support casting of the other side of the tunnel of the section.
In step S4, the driving motor is always kept rotating in the forward direction during the movement of the template support, so that the front end of the belt template can be kept rotating from top to bottom.
In step S4, the rotational speed of the belt template and the moving speed of the template holder are equal during the movement of the template holder.
In step S4, in the moving process of the template support, the rotary large arm continuously and slowly stretches forwards, and the piston rod of the pitching oil cylinder is continuously recovered, so that the pitching angle between the template support and the rotary large arm is adaptively adjusted, and the belt template can be matched with the radian of the steel arch to the greatest extent.
In the steps S3 and S4, the supporting function of the template supporting roller on the front end of the belt template is always kept, and under the action of the supporting cylinder, the advancing fluctuation of the template support caused by the unevenness of the steel arch can be effectively buffered, the belt template is kept close to the steel arch all the time, and the leakage of sprayed concrete from two sides is avoided.
In the steps S3 and S4, under the action of the tensioning main roller and the tensioning auxiliary roller, the change of the tightness degree of the belt template caused by the expansion and contraction of the supporting air cylinder can be effectively compensated, so that the whole process of the belt template can be kept within a certain tensioning range.
In step S4, during the rotation of the belt template, the template supporting roller is kept to roll on the inner side of the front end of the belt template, and a strong top support is formed on the belt template.
Step S6, overlapping the primary support concrete layer poured on the left side and the right side of the Duan Ci tunnel at the top of the tunnel, and supporting and strickling the primary support concrete layer by using a template after filling up the overlapping part to finish the supporting of the tunnel outline of the section; after the mould spraying pouring of the arc-shaped area between two adjacent steel arches and the area between the two steel arches is finished, the sliding trolley carrying the rotary large arm can be moved forwards for 2 times along the sliding frame on the trolley, the moving distance of each time is equal to the width between the two adjacent steel arches, and the steps S1-S5 are repeated once moving.
After the continuous three steel arch areas are subjected to die spraying pouring by one-time vehicle moving, the trolley is moved forward by a distance equal to the length of the sliding frame (or the width of the three steel arches), and the steps S1-S6 are repeated until the die spraying primary support of the whole tunnel is completed.
In practice, the length of the mould spraying trolley sliding frame is generally designed into the width of three steel arches, namely the distance between two steel arches at the outer sides of four continuous steel arches, and the trolley is moved once by the sliding trolley, so that the mould spraying pouring of the three continuous steel arches can be met, the number of times of mould spraying is reduced, and the mould spraying efficiency is improved. In theory the skid can be designed longer, but is limited by the length of the trolley and the curvature of the tunnel, and cannot be made too long, which can lead to higher demands and possible difficulties for subsequent operations.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (6)
1. Tunnel preliminary bracing mould spouts with belt template subassembly, its characterized in that: the belt template comprises a flexible annular belt template and a template support, wherein a plurality of belt supporting rollers are transversely arranged on the front side of the template support side by side, the belt template is sleeved on the belt supporting rollers, and the front end belt template can be clung to more than two adjacent steel arches, so that a die cavity to be poured is formed among the belt template, a rock surface and the steel arches;
the belt supporting rollers are fixed on the side frames at two sides through supporting roller seats, each supporting roller seat comprises a seat plate and a perforated lug plate, the belt Kong Er plates are vertically fixed at the front sides of the seat plates and used for fixing roller shafts of the supporting rollers, and the seat plates are fixed on the side frames through supporting cylinders; the side frame comprises a front vertical beam and a rear vertical beam, an auxiliary vertical beam is fixed on the inner side of the rear vertical beam of the side frame, a cylinder body of the supporting cylinder is fixed on the auxiliary vertical beam, and a piston rod is fixed on the rear side of the seat plate; the support roller seat also comprises a guide shaft vertically connected to the rear side of the seat plate, and the guide shaft is inserted into a guide shaft sleeve fixed on the front vertical beam of the side frame; the connecting part of the side frame front vertical beam and the guide shaft sleeve is provided with a through hole communicated with an inner hole of the guide shaft sleeve, and the guide shaft can penetrate through the through hole to enter between the side frame front vertical beam and the side frame rear vertical beam;
a tensioning main roller is arranged on the template support and positioned on the inner side of the rear end belt template; the main roller seat of the tensioning main roller is the same as the supporting roller seat and comprises a second seat plate, a second perforated lug plate, a second supporting cylinder and a second guide shaft; the second seat board of main roller seat is located outside the trailing flank of the back vertical beam of frame, and its second area Kong Er board is fixed at the trailing flank of second seat board, supplementary vertical beam is equipped with the fracture in the position just to tensioning main roller to divide into two sections with every supplementary vertical beam, the second supports the cylinder and passes through the fracture, and its cylinder body is fixed on the connecting plate, and the piston rod is fixed at the leading flank of second seat board.
2. The belt template assembly for tunnel primary support die spraying of claim 1, wherein: the template support is provided with upper turning rollers at the top and bottom of the inner side of the belt template
And a lower turning roll; the diameters of the upper and lower turning rollers are larger than the diameters of the belt supporting rollers.
3. The belt template assembly for tunnel primary support die spraying according to claim 2, wherein: the roll shaft of the upper turning roll or the lower turning roll is connected with a driving motor, and the turning of the driving motor is carried out
The roller can drive the belt template to rotate.
4. The belt template assembly for tunnel primary support die spraying according to claim 2, wherein: a tensioning main roller is arranged on the inner side of the rear end belt template and positioned on the template support, so that the belt template can be pressed
The plate is propped backwards to achieve the function of tensioning the belt template.
5. The belt template assembly for tunnel primary support die spraying of claim 4, wherein: a tensioning auxiliary roller is respectively arranged on the upper and lower sides of the tensioning main roller on the template support to match with the tension
The main roller is tightly tightened to strengthen the tensioning effect.
6. The belt template assembly for tunnel primary support die spraying of claim 4, wherein: the template support comprises rectangular side frames positioned at two sides, and the rear ends of the two side frames are provided with
An upper connecting beam and a lower connecting beam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN111520165B (en) * | 2020-05-09 | 2020-12-01 | 广东水电二局股份有限公司 | Tunnel construction is with spraying concrete device with reduce rebound rate |
| CN112855222A (en) * | 2021-04-02 | 2021-05-28 | 中国铁建重工集团股份有限公司 | A mould spouts device for concrete sprays |
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