CN214997679U - Straight clamping and reinforcing bent for rock pillar in middle of tunnel - Google Patents
Straight clamping and reinforcing bent for rock pillar in middle of tunnel Download PDFInfo
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- CN214997679U CN214997679U CN202120651913.5U CN202120651913U CN214997679U CN 214997679 U CN214997679 U CN 214997679U CN 202120651913 U CN202120651913 U CN 202120651913U CN 214997679 U CN214997679 U CN 214997679U
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Abstract
The utility model discloses a framed bent is consolidated to straight type centre gripping of rock pillar in middle of tunnel, include: the straight type bent plate, the split bolt, the nut cushion block and the nut cushion block; the straight bent plates are square vertical plane plates, the two straight bent plates are symmetrically arranged on two sides of a rock pillar straight clamping and reinforcing bent in the middle of the tunnel, a plurality of sets of counter bolts transversely penetrate through the two straight bent plates, and nut cushion blocks are respectively arranged at two ends of each set of counter bolts extending out of the outer sides of the two straight bent plates and are fixedly clamped by screwing nuts; eight isosceles right triangle-shaped bent plate hollows are formed in each straight bent plate in a centrosymmetric mode, the inner side of each straight bent plate is attached to the outer wall of a tunnel primary support at the position corresponding to the middle rock pillar of the tunnel, and therefore clamping and reinforcing are conducted on the middle rock pillar of the tunnel and the tunnel primary support at the corresponding position. The utility model discloses show wholeness, stability, lateral rigidity and the bearing capacity that has improved middle rock pillar, shortened construction cycle.
Description
Technical Field
The utility model relates to a tunnel construction technical field, concretely relates to framed bent is consolidated to straight type centre gripping of rock pillar in middle of tunnel.
Background
Along with the rapid development of infrastructure construction in China, large-section and small-distance tunnels are often adopted in the fields of urban underground engineering tunnels such as highway mountain tunnels, railway mountain tunnels, urban rail transit, comprehensive underground pipe galleries and the like. For the tunnel of the type, due to the characteristics of large section, small clear distance, low flatness rate and the like, two ideas are usually provided for selecting a construction method, namely a multi-arch tunnel form and a tunnel double-hole middle rock pillar reinforcement form. Because the two forms of the construction principles, the stress characteristics and the sequence of the construction methods are different, the two forms of the construction methods have advantages and disadvantages.
If the multi-arch tunnel form is conservatively adopted, the problem of stress reliability of the double-hole middle rock pillar of the large-section small-clear-distance tunnel can be solved, the middle partition wall can be used for replacing the double-hole middle rock pillar to complete stress, and the following defects are obvious. The method has the disadvantages of high construction difficulty and long construction period of the multi-arch tunnel. The three-pilot tunnel form is mostly adopted, and then a middle pilot tunnel needs to be excavated firstly, then an intermediate wall is constructed, and then left and right pilot tunnels need to be excavated respectively. Excavation and preliminary bracing are needed in each step, the whole tunnel excavation process is cut into a plurality of fine crushing steps, and the whole construction period is greatly prolonged. The second disadvantage is that the construction cost of the multi-arch tunnel is high, the construction cost is increased due to the increase of construction engineering quantity, working procedures and construction period, and wiring is difficult if independent double holes are constructed. And the waterproof treatment effect of the joint of the middle pilot hole and the main hole is poor. The problem is always a difficult problem which is difficult to be solved thoroughly in the industry, and particularly in the multi-arch tunnel in the northern area, the situation that the position leaks is common after ice and snow are ablated and the structural temperature is expanded and contracted in winter.
If a tunnel double-hole middle rock pillar reinforcement mode is adopted, a plurality of defects caused by a multi-arch tunnel mode can be avoided, the construction difficulty and cost can be reduced, the construction period is shortened, the integrally formed primary support has a good waterproof effect, and the tunnel double-hole middle rock pillar reinforcement mode has the advantages of combining the advantages of an independent double-hole tunnel and the advantages of the multi-arch tunnel. However, because the thickness of the middle rock pillar of the large-section small-clear-distance tunnel is far smaller than that of the common separated tunnel, the middle rock pillar is disturbed for many times in the construction process, so that the stability of the surrounding rock and the stress of the supporting structure are complex. When the tunnel is constructed in advance, the construction is the same as that of a common single hole, and when the tunnel is constructed in the later period, the surrounding rock generates complex stress redistribution. The key of the design and construction of the small-clear-distance tunnel is to ensure the stability of the middle rock pillar of the small-clear-distance tunnel, so that the development of the reinforcing device and the construction method thereof, which are simple, fast, good in effect and economical in manufacturing cost, on the middle rock pillar, has great significance.
At present, a common reinforcing device is mainly in the form of a counter-pulling anchor rod or a common anchor rod plus no grouting/grouting form or a prestressed anchor rod plus no grouting/grouting form, has certain effect, but has obvious defects. The stock is mostly finish rolling twisted steel material, no matter to drawing the stock or the form of "stock + slip casting", and its axial rigidity and bearing capacity can not play very ideal reinforcing effect in the middle of little net distance tunnel double tunnel rock pillar department. The middle pillar needs to provide a considerable clamping action in the lateral direction to ensure that its lateral stiffness is sufficiently large, thereby improving its axial bearing capacity. In addition, the anchor rods are arranged in a dispersed mode, even if the anchor rods are combined with reinforcing mesh sheets, only a small area where the anchor rods are located can be covered as the circle center for clamping, the rigidity is reduced in a non-anchor rod area, the effect of the anchor rods in a non-opposite-pulling mode is poorer, and therefore the integrity and the stability of the middle rock pillar cannot be well guaranteed.
Therefore, along with the increase of the construction requirements of large-section small-clearance tunnels in the fields of urban underground engineering tunnels such as highway mountain tunnels, railway mountain tunnels, urban rail transit, comprehensive underground pipe galleries and the like, a new structure needs to be researched and developed for a reinforcing device of the middle rock pillar so as to enhance the integrity, stability, lateral rigidity and bearing capacity of the middle rock pillar and further improve the overall safety and economy of the engineering.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a framed bent is consolidated to straight type centre gripping of rock pillar in the middle of the tunnel to solve the problem that proposes among the above-mentioned background art.
In order to achieve the above object, the utility model provides a framed bent is consolidated to straight type centre gripping of rock pillar in middle of the tunnel, include: the straight type bent plate, the split bolt, the nut cushion block and the nut cushion block; the straight bent frame plates are square vertical plane plates, the number of the straight bent frame plates is two, the two straight bent frame plates are symmetrically arranged on two sides of a rock pillar straight clamping and reinforcing bent frame in the middle of a tunnel, the number of the counter bolts is multiple, the multiple counter bolts transversely penetrate through the two straight bent frame plates, and nut cushion blocks are respectively arranged at two ends, extending out of the outer sides of the two straight bent frame plates, of each counter bolt and are fixedly clamped by tightening nuts; and eight isosceles right triangle-shaped bent frame plate hollows are formed in each straight bent frame plate in a centrosymmetric manner, so that the straight bent frame plates form four outer frames and a support structure shaped like a Chinese character mi is formed inside the straight bent frame plates, and the inner sides of the straight bent frame plates are attached to the outer wall of the tunnel primary support at the position corresponding to the tunnel middle rock pillar, so that the tunnel middle rock pillar and the tunnel primary support at the corresponding position are clamped and reinforced.
In a preferred embodiment, nine bent plate bolt holes are arranged on the straight bent plate in a central symmetry manner, the bent plate bolt holes are arranged in three rows and three columns, one bent plate bolt hole is arranged in the center of the straight bent plate, the other eight bent plate bolt holes are respectively arranged in the centers of four corners and four outer frames of the straight bent plate, and each bent plate bolt hole is respectively penetrated with a set of split bolts.
In a preferred embodiment, each set of split bolts comprises a screw rod and two nuts, the specifications and the dimensions of the nine sets of split bolts are the same, and the split bolts are high-strength bolts.
In a preferred embodiment, the number of the nut cushion blocks is nine, each nut cushion block comprises a first square steel plate and three nut cushion block fixing feet welded on the first square steel plate, the three nut cushion block fixing feet are arranged in a central symmetry mode around nut cushion block bolt holes, the nut cushion block bolt holes are the same as the apertures of the bent frame plate bolt holes and keep the positions concentric, and the back faces of the nut cushion blocks are connected with the straight bent frame plate in a welded mode.
In a preferred embodiment, the number of the nut cushion blocks is nine, each nut cushion block comprises a second square steel plate, the size of the second square steel plate is the same as that of the first square steel plate, a nut cushion block bolt hole is formed in the center of the second square steel plate, the nut cushion block bolt hole is the same as the hole diameter of the bent frame plate bolt hole and keeps the position concentric, and the back surface of the nut cushion block is connected with the straight bent frame plate in a welded mode.
In a preferred embodiment, the length of each outer frame of the straight-type bent plate is equal to 2000-.
In a preferred embodiment, the smooth portion of the shank of the split bolt has a diameter of 56mm and a length of 1000mm to 3000 mm.
In a preferred embodiment, the length of the outer side of the first square steel plate of the nut block is 150-300mm, the thickness of the first square steel plate is 20-40mm, the diameter of the nut block bolt hole at the center of the first square steel plate is 56mm, the three nut block fixing legs arranged in central symmetry are 50mm × 15mm × 35mm, and the shortest vertical distance from the inner side of each nut block fixing leg to the center of the nut block bolt hole is 45 mm.
In a preferred embodiment, the length of the outer profile edge of the second square steel plate of the nut cushion block is 150-300mm, the thickness of the second square steel plate is 20-40mm, and the diameter of the nut cushion block bolt hole at the center of the second square steel plate is 56 mm.
Compared with the prior art, the utility model discloses a bent is consolidated to straight type centre gripping of rock pillar in the middle of the tunnel beneficial effect is:
1. the utility model discloses a framed bent is consolidated to straight type centre gripping, both sides framed bent inner wall can with the better laminating contact of tunnel preliminary bracing, make full use of framed bent board to the wholeness improvement of middle pillar side and to the axial force of drawing high strength bolt, carry out centre gripping and reinforcement to middle pillar, also utilize the restriction to middle pillar lateral deformation, and then the wholeness of middle pillar, stability, lateral rigidity and bearing capacity have fully improved, the whole security of engineering and economic nature have been strengthened.
2. The utility model discloses a framed bent is consolidated to straight type centre gripping of rock pillar in the middle of the tunnel avoids adopting the even tunnel form of encircleing, avoids adopting three pilot tunnel forms or well pilot tunnel form promptly to reduced the construction degree of difficulty, shortened construction cycle, saved the construction cost, avoided well pilot tunnel and positive hole to meet later stage problem such as the poor water treatment effect of department.
Drawings
Fig. 1 is a front northeast axis measuring view of the vertical clamping reinforcing bent frame for the rock pillar in the middle of the tunnel according to an embodiment of the present invention.
Fig. 2 shows a schematic view of the north-west axis of the reverse side of the straight clamping and reinforcing bent of the rock pillar in the middle of the tunnel according to an embodiment of the present invention.
Fig. 3 is the utility model discloses an embodiment's the straight type centre gripping in middle of the tunnel rock pillar consolidates the installation effect section sketch map of framed bent.
Fig. 4 is a schematic front elevation view of the vertical clamping and reinforcing bent frame for the middle rock pillar of the tunnel according to an embodiment of the present invention.
Fig. 5 is a schematic view of a reverse vertical surface of a straight clamping reinforcing bent for a rock pillar in the middle of a tunnel according to an embodiment of the present invention.
Fig. 6 is a side view of the vertical clamping reinforcing bent frame for the middle rock pillar of the tunnel according to an embodiment of the present invention.
Fig. 7 is a schematic view of a straight rack plate according to an embodiment of the present invention.
Fig. 8 is a schematic perspective view of a split screw according to an embodiment of the present invention.
Fig. 9 is a schematic perspective view of a nut block according to an embodiment of the present invention.
Fig. 10 is a schematic perspective view of a nut block according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below. The embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative work, all belong to the protection scope of the present invention.
Example 1
As shown in fig. 1-10, the utility model discloses a bent is consolidated to straight type centre gripping of rock pillar in middle of tunnel of preferred embodiment, include: the straight type bent plate 1, split bolt 2, nut cushion 3 and nut cushion 4. Wherein, straight type is arranged frame plate 1 and is the vertical plane plate of square, and the quantity of straight type row frame plate 1 is two, and two straight type row frame plate 1 symmetrical arrangement are in the middle of the tunnel the both sides that the framed bent is consolidated to the straight type centre gripping of rock pillar, and the quantity to the stay bolt 2 is many sets, and many sets are transversely worn to establish in two straight type row frame plates 1 to the stay bolt 2, and every set stretches out in the both ends in two straight type row frame plate 1 outsides and is provided with nut cushion 3 and nut cushion 4 respectively to through screwing up nut fixed clamp. Eight isosceles right triangle's framed bent board fretworks 5 are seted up on every straight type framed bent board 1 to be central symmetry to make straight type framed bent board 1 form four outer frames and inside forms rice style of calligraphy bearing structure, framed bent board fretwork 5's setting can ensure framed bent board 1 intensity and resistance to deformation ability lower reduction whole weight and the volume of using steel. The inner side of the straight rack plate 1 is attached to the outer wall of the tunnel primary support 12 at the corresponding part of the tunnel middle rock pillar 11 so as to clamp and reinforce the tunnel middle rock pillar 11 and the tunnel primary support 12 at the corresponding part. Under the combined action of the straight type bent plate 1, the split bolt 2 and the matched nut cushion block 3 and the nut cushion block 4, the tunnel middle rock pillar 11 and the tunnel primary support 12 at the corresponding position are clamped and reinforced, and the split bolt 2 provides the transverse force required for reinforcement, so that the integrity, the stability, the lateral rigidity and the bearing capacity of the tunnel middle rock pillar 11 are improved.
Further, be central symmetric arrangement nine framed bent board bolt holes 6 on the straight type framed bent board 1, framed bent board bolt hole 6 becomes the triplex row three column and arranges, and one of them framed bent board bolt hole 6 sets up in the center of straight type framed bent board 1, and eight framed bent board bolt holes 6 set up respectively in the center of four angles and four outer frames of straight type framed bent board 1 in addition, wear to be equipped with one set of split bolt 2 in every framed bent board bolt hole 6 respectively.
Furthermore, each set of split bolt 2 comprises a screw rod and two nuts, the specifications and the sizes of the nine sets of split bolts 2 are the same, and the split bolts 2 are high-strength bolts.
Further, the quantity of nut cushion 3 is nine, and every nut cushion 3 includes first square steel sheet and the fixed foot 7 of three nut cushion of welding on first square steel sheet, and the fixed foot 7 of three nut cushion is central symmetry around nut cushion bolt hole 8 and arranges. The nut cushion block bolt holes 8 are the same as the apertures of the bent plate bolt holes 6 and are concentric with the positions of the bent plate bolt holes 6, and the back surfaces of the nut cushion blocks 3 are welded with the straight bent plate 1.
Further, the quantity of nut cushion 4 is nine, and every nut cushion 4 includes the square steel sheet of second, and the size of the square steel sheet of second is the same with the size of first square steel sheet. The center of the second square steel plate is provided with a nut cushion block bolt hole 9, the nut cushion block bolt hole 9 is the same as the aperture of the bent plate bolt hole 6 and keeps concentric, and the back of the nut cushion block 4 is connected with the straight bent plate 1 in a welding mode.
Example 2
In a preferred embodiment, the length of each outer frame of the straight rack plate 1 is equal to 2000-.
In a preferred embodiment, the smooth portion of the shank of the split bolt 2 has a diameter of 56mm and a length of 1000mm to 3000 mm.
In a preferred embodiment, the outer contour edge of the first square steel plate of the nut block 3 is 150-300mm, the thickness of the first square steel plate is 20-40mm, the diameter of the nut block bolt hole 8 at the center of the first square steel plate is 56mm, the three nut block fixing legs 7 arranged in central symmetry are 50mm × 15mm × 35mm, and the shortest vertical distance from the inner side edge of the nut block fixing leg 7 to the center of the nut block bolt hole 8 is 45 mm.
In a preferred embodiment, the outer contour edge length of the second square steel plate of the nut cushion block 4 is 150-300mm, the thickness of the second square steel plate is 20-40mm, and the diameter of the nut cushion block bolt hole 9 at the center of the second square steel plate is 56 mm.
Example 3
The utility model discloses a framed bent application is extensive in the middle of the tunnel is consolidated to straight type centre gripping of rock pillar, can be applied to fields such as city underground engineering tunnel of highway mountain tunnel, railway mountain tunnel, city track traffic and comprehensive underground pipe gallery category. The application of the straight clamping and reinforcing bent frame for the rock pillar in the middle of the tunnel in the mountain tunnel engineering construction is described with the attached drawings.
Example background:
the mountain tunnel of a certain expressway is a double-hole tunnel with a large section of 2 multiplied by 10.25m and a small clear distance, the vertical length of the middle section part of a rock pillar in the middle of the double holes is about 2.5m, the linearity approaches to a straight line, wherein IV 3-level surrounding rock 112m and IV 2-level surrounding rock 166 m. The cavity lining type comprises four lining structures of SLMa, SL5a, SL4a and SL4 b. The lighting mode adopts electric lighting, and the ventilation mode is natural ventilation. The inlet and the outlet are respectively provided with an advanced large pipe shed for entering the tunnel, and the lengths of the inlet and the outlet are respectively 30 meters and 60 meters. The entrance and exit portal is in end wall type. This tunnel drainage: the structure is waterproof, and waterproof concrete is adopted; waterproof three-joint, annular, longitudinal construction joint; thirdly, the outside of the molded concrete lining is waterproof, and a waterproof board is arranged; and fourthly, circumferential and longitudinal drainage pipes (connected by a tee joint). Adopt the utility model provides a scheme design is consolidated to centre gripping that the bent was carried out the middle rock pillar in this double tunnel to the straight type centre gripping of middle rock pillar in tunnel, provides following application example.
The concrete processing preparation and the installation process of the straight clamping and reinforcing bent of the rock pillar in the middle of the tunnel are as follows:
all materials of the straight row frame plate 1 are 45H steel, a steel plate with the thickness of 30mm is selected for cutting, the outer contour is square, and the side length is 2000 mm; drilling 9 circular bent plate bolt holes 6 with the diameter of 56mm at the centers of four corners and four sides of a square plate 75mm away from the edge of the outer contour and 9 points at the center of the square; cutting isosceles right triangle hollowed-out parts 5 with the length of a right-angle side being 600mm at a position 150mm away from the edge of the outer contour, wherein the bevel edge of the triangle is parallel to the diagonal line of the square steel plate, and cutting to obtain 8 isosceles right triangle bent frame plate hollowed-out parts 5; and polishing and antirust coating the cut and drilled steel plate.
The split bolt 2 adopts a standard 12.9-grade M56 high-strength bolt and a matched nut, the length of the split bolt 2 is 2000mm, and the split bolt 2 is treated by brushing anti-rust grease.
All materials of the nut cushion block 3 are 45H steel, a steel plate with the thickness of 20mm is selected for cutting, the outer contour is square, and the side length is 150 mm; 1 nut block bolt hole 8 of 56mm diameter was drilled at the center of the square. The nut cushion fixing foot 7 is formed by cutting a 15mm thick steel plate, the size is 50mm multiplied by 15mm multiplied by 35mm, the 50mm multiplied by 15mm cross section is used as a welding surface to be welded with the nut cushion 3 steel plate, and the perpendicular shortest distance from the inner side of the nut cushion fixing foot 7 to the center of the nut cushion bolt hole 8 is 45 mm. The nut cushion blocks 3 are polished, then the back surfaces of the nut cushion blocks, namely the surfaces without welded nut cushion block fixing feet 7, are concentrically and closely adhered and welded with the bent plate bolt holes 6 on the straight bent plate 1 which is prepared to be in nut contact with the split bolts 2, the outer contour of the bent plate is parallel to that of the straight bent plate 1, and rust-proof coating is carried out after welding.
All materials of the nut cushion block 4 are 45H steel, a steel plate with the thickness of 20mm is selected for cutting, the outer contour is square, and the side length is 150 mm. Drilling 1 nut cushion block bolt hole 9 with the diameter of 56mm at the center of the square, polishing the nut cushion block 4, then concentrically and closely welding the nut cushion block with a bent plate bolt hole 5 on a straight bent plate 1 in nut contact with a split bolt 2, enabling the outer contour to be parallel to the straight bent plate 1, and performing antirust coating after welding.
Before the straight clamping reinforcing bent frame 10 is installed, measurement and positioning are carried out: after the excavation of the front tunnel of the large-section small-clear-distance tunnel is finished and the tunnel primary support 12 is completed, the rear tunnel is excavated, and after the depth reaches 2000mm and the tunnel primary support 12 of the rear tunnel is carried out, the alignment type clamping and reinforcing bent frame 10 is positioned before installation through a total station.
Drilling the tunnel primary support 12 and the tunnel middle rock pillar 11: after the installation position of the straight clamping reinforcing bent frame 10 is determined, drilling holes in a tunnel primary support 12 and a tunnel middle rock pillar 11 corresponding to the installation position of the 9 sets of split bolts 2 until the holes are communicated, and simultaneously, forming grouting holes in 45-degree inclined positions on one side where each drilling nut is installed.
The straight clamping reinforcing bent 10 is mounted in place: the bent plate 1 welded with the nut cushion blocks 3 and 4 is respectively installed at the installation position outside the primary tunnel support 12.
Installing and fastening the split bolt 2: the split bolts 2 sequentially penetrate through the nut cushion block bolt holes 8, the bent plate bolt holes 6, the tunnel primary support and tunnel middle rock pillar drill through holes, the bent plate bolt holes 6 and the nut cushion block bolt holes 9, nuts are installed and screwed, the nine sets of split bolts 2 are uniformly and synchronously screwed to 1050 kg.m, and split reinforcement is completed.
Grouting and sealing: grouting is carried out through the grouting holes, waterproof slurry is fully poured into the bolt drilling holes, the grouting holes are plugged, waterproof materials such as acrylic acid, epoxy or polyurethane are coated on the outer sides of nuts and nuts of the split bolts 2 to carry out waterproof treatment, the waterproof materials are coated to cover the nut cushion blocks 3 and the nut cushion blocks 4 sufficiently, and the straight clamping reinforcing bent frame 10 starts to work.
After the installation of the straight clamping and reinforcing bent 10 is completed, the tunneling is continued and the following installation is continued, so that the timely installation of the straight clamping and reinforcing bent of the middle rock pillar of the large-section small-clear-distance tunnel is ensured, the deformation monitoring of the middle rock pillar is enhanced in the installation process and after the installation, and the stress reliability and the safety of the middle rock pillar are ensured.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The utility model provides a framed bent is consolidated to straight type centre gripping of rock pillar in middle of tunnel which characterized in that: the straight type centre gripping of rock pillar consolidates framed bent in the middle of the tunnel includes: the straight type bent plate (1), the split bolt (2), the nut cushion block (3) and the nut cushion block (4);
the straight type bent frame plates (1) are square vertical plane plates, the number of the straight type bent frame plates (1) is two, the two straight type bent frame plates (1) are symmetrically arranged on two sides of a straight type clamping and reinforcing bent frame, the number of the counter bolts (2) is multiple, the multiple sets of counter bolts (2) transversely penetrate through the two straight type bent frame plates (1), and the nut cushion blocks (3) and the nut cushion blocks (4) are respectively arranged at two ends, extending out of the two straight type bent frame plates (1), of each set of counter bolts (2) and are fixedly clamped by screwing nuts;
and wherein, every be eight isosceles right triangle's framed bent board fretwork (5) are seted up to central symmetry on straight type framed bent board (1), so that straight type framed bent board (1) forms four outer frames and inside forms rice style of calligraphy bearing structure, the inboard tunnel preliminary bracing (12) that corresponds the position with tunnel middle rock pillar (11) of straight type framed bent board (1) outer wall laminating mutually, in order to right tunnel middle rock pillar (11) and the tunnel preliminary bracing (12) of corresponding position carry out the centre gripping reinforcement.
2. The tunnel middle rock pillar straight clamping and reinforcing bent frame as claimed in claim 1, wherein: it has nine framed bent board bolt holes (6) to be central symmetric arrangement on straight type framed bent board (1), framed bent board bolt hole (6) become the triplex row three column and arrange, one of them framed bent board bolt hole (6) set up the center of straight type framed bent board (1), eight in addition framed bent board bolt hole (6) set up respectively on four angles of straight type framed bent board (1) and the center of four outer frames, every wear to be equipped with one set respectively in framed bent board bolt hole (6) split bolt (2).
3. The tunnel middle rock pillar straight clamping and reinforcing bent frame as claimed in claim 2, wherein: each set of split bolt (2) comprises a screw rod and two nuts, the specification and the size of the nine sets of split bolts (2) are the same, and the split bolts (2) are high-strength bolts.
4. The tunnel middle rock pillar straight clamping and reinforcing bent frame as claimed in claim 3, wherein: the quantity of nut cushion (3) is nine, and every nut cushion (3) includes that first square steel sheet and welding are fixed foot (7) in the three nut cushion on first square steel sheet, and is three nut cushion fixes foot (7) and is central symmetry around nut cushion bolt hole (8) and arranges, nut cushion bolt hole (8) with the aperture of framed bent board bolt hole (6) is the same and keep the position concentric, the back of nut cushion (3) is with straight framed bent board (1) welded connection.
5. The tunnel middle rock pillar straight clamping and reinforcing bent frame as claimed in claim 4, wherein: the quantity of nut cushion (4) is nine, every nut cushion (4) includes the square steel sheet of second, and the size of the square steel sheet of second is the same with the size of first square steel sheet, and the square steel sheet center department of second has seted up nut cushion bolt hole (9), nut cushion bolt hole (9) with the aperture of bent plate bolt hole (6) is the same and keep the position concentric, just the back of nut cushion (4) is with straight type bent plate (1) welded connection.
6. The tunnel middle rock pillar straight clamping and reinforcing bent frame as claimed in claim 5, wherein: the length of each outer frame of the straight type bent plate (1) is equal and is 2000-4000mm, the thickness of the straight type bent plate (1) is 30-50mm, the length of the right-angle side of the bent plate hollow (5) is 600-1200mm, the distance from the right-angle side to the outer frame is 150-300mm, the vertical distance from the center of the bent plate bolt hole (6) to the outer frame is 75-150mm, and the diameter of the bent plate bolt hole (6) is 56 mm.
7. The tunnel middle rock pillar straight clamping and reinforcing bent frame as claimed in claim 6, wherein: the diameter of the smooth part of the screw of the split bolt (2) is 56mm, and the length is 1000mm-3000 mm.
8. The tunnel middle rock pillar straight clamping and reinforcing bent frame as claimed in claim 7, wherein: the outer contour edge length of a first square steel plate of the nut cushion block (3) is 150-300mm, the thickness of the first square steel plate is 20-40mm, the diameter of a nut cushion block bolt hole (8) located in the center of the first square steel plate is 56mm, the size of three nut cushion block fixing feet (7) which are arranged in central symmetry is 50mm multiplied by 15mm multiplied by 35mm, and the perpendicular shortest distance from the inner side edge of each nut cushion block fixing foot (7) to the center of the nut cushion block bolt hole (8) is 45 mm.
9. The tunnel middle rock pillar straight clamping and reinforcing bent frame as claimed in claim 7, wherein: the length of the outer contour edge of the second square steel plate of the nut cushion block (4) is 150-300mm, the thickness of the second square steel plate is 20-40mm, and the diameter of a nut cushion block bolt hole (9) in the center of the second square steel plate is 56 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120651913.5U CN214997679U (en) | 2021-03-31 | 2021-03-31 | Straight clamping and reinforcing bent for rock pillar in middle of tunnel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120651913.5U CN214997679U (en) | 2021-03-31 | 2021-03-31 | Straight clamping and reinforcing bent for rock pillar in middle of tunnel |
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| CN214997679U true CN214997679U (en) | 2021-12-03 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113047865A (en) * | 2021-03-31 | 2021-06-29 | 中建二局第三建筑工程有限公司 | Clamping and reinforcing bent frame for middle rock pillar of large-section small-clear-distance tunnel and construction method of clamping and reinforcing bent frame |
| CN117888930A (en) * | 2024-03-14 | 2024-04-16 | 山西路桥第二工程有限公司 | Be arranged in small clear distance tunnel to press from both sides rock reinforcement supporting equipment |
-
2021
- 2021-03-31 CN CN202120651913.5U patent/CN214997679U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113047865A (en) * | 2021-03-31 | 2021-06-29 | 中建二局第三建筑工程有限公司 | Clamping and reinforcing bent frame for middle rock pillar of large-section small-clear-distance tunnel and construction method of clamping and reinforcing bent frame |
| CN117888930A (en) * | 2024-03-14 | 2024-04-16 | 山西路桥第二工程有限公司 | Be arranged in small clear distance tunnel to press from both sides rock reinforcement supporting equipment |
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