CN113047865A - 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 - Google Patents
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 Download PDFInfo
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- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 71
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- 239000010959 steel Substances 0.000 claims description 72
- 238000009434 installation Methods 0.000 claims description 35
- 238000005553 drilling Methods 0.000 claims description 22
- 230000002787 reinforcement Effects 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 13
- 238000009412 basement excavation Methods 0.000 claims description 10
- 238000005259 measurement Methods 0.000 claims description 6
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- 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
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- 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
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Abstract
The invention discloses a clamping and reinforcing bent frame of a middle rock pillar of a large-section small-clear-distance tunnel and a construction method thereof, wherein the clamping and reinforcing bent frame comprises the following components: the rack plate, the split bolts, the nut cushion blocks and the nut cushion blocks; the number of the bent frame plates is two, the two bent frame plates are symmetrically arranged on two sides of a clamping and reinforcing bent frame, the number of the split bolts is multiple, the multiple split bolts transversely penetrate through the two bent frame plates, and nut cushion blocks are respectively arranged at two ends, extending out of the outer sides of the two bent frame plates, of each split bolt and are fixedly clamped by tightening nuts; and eight right-angled triangle-shaped bent frame plate hollows are arranged on each bent frame plate in a centrosymmetric manner, so that the bent frame plates form four outer frames and form a support structure in a shape like a Chinese character mi inside, and the inner walls of the bent frame plates are attached to the outer wall of the tunnel primary support corresponding to the middle rock pillar of the tunnel.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to a clamping and reinforcing bent frame for a middle rock pillar of a large-section small-clear-distance tunnel and a construction method thereof.
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 forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a clamping and reinforcing bent frame for a middle rock pillar of a large-section small-clear-distance tunnel and a construction method thereof, and aims to solve the problems in the background art.
In order to achieve the purpose, the invention provides a clamping and reinforcing bent frame for a middle rock pillar of a large-section small-clear-distance tunnel, which comprises: the rack plate, the split bolts, the nut cushion blocks and the nut cushion blocks; the number of the bent frame plates is two, the two bent frame plates are symmetrically arranged on two sides of a clamping and reinforcing bent frame, the number of the split bolts is multiple, the multiple split bolts transversely penetrate through the two bent frame plates, and nut cushion blocks are respectively arranged at two ends, extending out of the outer sides of the two bent frame plates, of each split bolt and are fixedly clamped by tightening nuts; and eight bent plate hollows are arranged on each bent plate in a centrosymmetric manner, so that the bent plates form four outer frames and form a support structure in a shape like a Chinese character mi inside the bent plates, and the inner walls of the bent plates are attached to the outer wall of the tunnel primary support corresponding to the middle rock pillar of the tunnel.
In a preferred embodiment, the bent plate is a square vertical plane plate, the bent plate is hollowed into an isosceles right triangle, nine bent plate bolt holes are formed in the bent plate in a central symmetrical mode, the bent plate bolt holes are arranged in three rows and three columns, one bent plate bolt hole is formed in the center of the bent plate, the other eight bent plate bolt holes are formed in the four corners of the bent plate and the centers of the four outer frames, and a set of counter bolts is arranged in each bent plate bolt hole in a penetrating mode.
In a preferred embodiment, the nine sets of split bolts are all the same in specification and size, and the split bolts are high-strength bolts; 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 legs welded on the first square steel plate, the three nut cushion block fixing legs are arranged around a nut cushion block bolt hole in a centrosymmetric mode, the hole diameters of the nut cushion block bolt holes are the same as those of the bent plate bolt holes, the nut cushion block bolt holes are concentric with the bent plate bolt holes, and the back faces of the nut cushion blocks are welded with the bent plate; the quantity of nut cushion is nine, and every nut cushion 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, and nut cushion bolt hole is the same with the aperture of framed bent board bolt hole and the holding position is concentric, and the back of nut cushion is with framed bent board welded connection.
In a preferred embodiment, the bent plate is a curved plate bent towards the outside, the inner wall of the bent plate attached to the tunnel primary support is curved arc, the distance between the upper outer frame and the lower outer frame of the two bent plates is respectively greater than the distance between the middle parts of the two bent plates, the planar projection outer contour of the bent plates is rectangular, and nine bent plate bolt holes and eight bent plate hollows projected to form an isosceles right triangle are symmetrically arranged on each bent plate in the projection center.
In a preferred embodiment, the tie bolts include a first tie bolt and a second tie bolt, wherein the number of the first tie bolt is six, the specifications of the six first tie bolts are the same, the six first tie bolts are respectively arranged at four corners of the rack plate and the centers of the upper outer frame and the lower outer frame, the number of the second tie bolt is three, the specifications of the three second tie bolts are the same, and the three second tie bolts are respectively arranged at the center of the rack plate and the centers of the left outer frame and the right outer frame, wherein the length of the first tie bolt is greater than the length of the second tie bolt.
In a preferred embodiment, the nut cushion blocks comprise a first nut cushion block and a second nut cushion block, the two ends of the first counter pull bolt, which extend out of the two rack plates, are respectively provided with the first nut cushion block and the first nut cushion block, and the two ends of the second counter pull bolt, which extend out of the two rack plates, are respectively provided with the second nut cushion block and the second nut cushion block.
In a preferred embodiment, the first nut cushion block comprises a first steel plate with a square front surface and a right trapezoid cross section, three first nut cushion block fixing legs are welded on the first steel plate, the three first nut cushion block fixing legs are arranged around a first nut cushion block bolt hole in a central symmetry manner, the first nut cushion block bolt hole is the same as the hole diameter of the framed bent plate bolt hole and keeps concentric positions, the back surface of the first nut cushion block is the surface with one side of a trapezoid inclined edge, and after the back surface of the first nut cushion block is welded with the framed bent plate, the front surface of the first nut cushion block is still perpendicular to the axial direction of the first counter stay bolt; the second nut cushion block comprises a third square steel plate and three second nut cushion block fixing legs welded to the third square steel plate, the three second nut cushion block fixing legs are arranged around the second nut cushion block bolt holes in a centrosymmetric mode, the second nut cushion block bolt holes are the same as the apertures of the bent frame plate bolt holes in diameter and are concentric in position, and the second nut cushion block is welded to the bent frame plate.
In a preferred embodiment, the first nut cushion block comprises a second steel plate with a square front surface and a right trapezoid cross section, the size of the second steel plate is the same as that of the first steel plate, a first nut cushion block bolt hole is formed in the center of the second steel plate, the first nut cushion block bolt hole is the same as the aperture of the framed bent plate bolt hole and is concentric with the position of the framed bent plate bolt hole, the back surface of the first nut cushion block is the surface where one side of a trapezoid inclined edge is located, and after the back surface of the first nut cushion block is welded and connected with the framed bent plate, the front surface of the first nut cushion block is still perpendicular to the axial direction of the first counter stay bolt; the second nut cushion block comprises a fourth square steel plate, the size of the fourth square steel plate is the same as that of the third square steel plate, a second nut cushion block bolt hole is formed in the center of the fourth square steel plate, the second nut cushion block bolt hole is the same as the aperture of the bent frame plate bolt hole, the position of the second nut cushion block bolt hole is concentric with the position of the bent frame plate bolt hole, and the second nut cushion block is connected with the bent frame plate in a welded mode.
The invention also provides a construction method for clamping and reinforcing the bent frame of the middle rock pillar of the large-section small-clear-distance tunnel, which comprises the following steps:
the method comprises the following steps: the measurement and positioning are carried out before the clamping and reinforcing bent frame is installed: after the excavation of the front tunnel of the large-section small-clear-distance tunnel is finished and the primary tunnel support is completed, excavating and excavating the backward tunnel, and after the depth reaches 2000mm and the primary tunnel support of the backward tunnel is performed, positioning the clamping and reinforcing bent before installation;
step two: drilling a tunnel primary support and a tunnel middle rock pillar: after the installation position of the clamping and reinforcing bent frame is determined, drilling holes in a tunnel primary support and a tunnel middle rock pillar corresponding to the installation position of the sleeve split bolt until the holes are communicated, and simultaneously, forming grouting holes in 45-degree inclined positions on one side where each drilling nut is installed;
step three: installing the clamping and reinforcing bent frame in place: respectively installing the bent frame plates welded with the nut cushion blocks and the nut cushion blocks at the installation positions outside the primary support of the tunnel;
step four: installing and fastening split bolts: the split bolts sequentially penetrate through nut cushion block bolt holes, bent plate bolt holes, tunnel primary support and tunnel middle rock pillar drill through holes, bent plate bolt holes and nut cushion block bolt holes, nuts are installed and screwed, nine sets of split bolts are uniformly and synchronously screwed, and split reinforcement is completed;
step five: grouting and sealing: and grouting through the grouting holes, fully grouting waterproof slurry into the bolt drilling holes, plugging the grouting holes, and performing waterproof treatment on the outer sides of the nuts and the nuts of the split bolts.
The invention also provides a construction method for clamping and reinforcing the bent frame of the middle rock pillar of the large-section small-clear-distance tunnel, which comprises the following steps:
the method comprises the following steps: the measurement and positioning are carried out before the clamping and reinforcing bent frame is installed: after the excavation of the front tunnel of the large-section small-clear-distance tunnel is finished and the primary tunnel support is completed, excavating and excavating the backward tunnel, and after the depth reaches 2000mm and the primary tunnel support of the backward tunnel is performed, positioning the clamping and reinforcing bent before installation;
step two: drilling a tunnel primary support and a tunnel middle rock pillar: after the installation position of the bent clamping and reinforcing bent frame is determined, drilling holes in a tunnel primary support and a tunnel middle rock pillar corresponding to the installation positions of six sets of first counter stay bolts and three sets of second counter stay bolts until two holes are communicated, and simultaneously, forming grouting holes on one side of each drilling nut in an inclined mode at an angle of 45 degrees;
step three: the clamping and reinforcing bent frame is installed in place: respectively placing the bent frame plates welded with the first nut cushion block, the second nut cushion block, the first nut cushion block and the second nut cushion block at the installation positions outside the primary support of the tunnel;
step four: installing and fastening a first counter bolt: sequentially inserting a first pair of pull bolts through a first nut cushion block bolt hole, a bent frame plate bolt hole, a tunnel primary support and tunnel middle rock pillar drill through hole, a bent frame plate bolt hole and a first nut cushion block bolt hole, installing and screwing nuts, uniformly and synchronously screwing six sets of first pair of pull bolts, and completing opposite-pull reinforcement;
step five: installing and fastening a second split bolt: sequentially inserting second counter-pulling bolts through second nut cushion block bolt holes, bent plate bolt holes, tunnel primary support and tunnel middle rock pillar drill through holes, bent plate bolt holes and second nut cushion block bolt holes, installing and screwing nuts, uniformly and synchronously screwing three sets of second counter-pulling bolts, and finishing counter-pulling reinforcement;
step six: grouting and sealing: and grouting is carried out through the grouting holes, waterproof slurry is fully injected into the bolt drilling holes, the grouting holes are blocked, and waterproof treatment is carried out on the outer sides of the nuts and the nuts of the first pair of stay bolts and the second pair of stay bolts.
Compared with the prior art, the clamping and reinforcing bent frame for the middle rock pillar of the large-section small-clear-distance tunnel and the construction method thereof have the beneficial effects that:
1. according to the clamping and reinforcing bent frame for the middle rock pillar of the large-section small-clear-distance tunnel, the inner wall of the bent frame plate can be well attached and contacted with the primary support of the tunnel, the improvement of the integrity of the bent frame plate on the side surface of the middle rock pillar and the axial force of the oppositely-pulled high-strength bolt are fully utilized, the middle rock pillar is clamped and reinforced, the limitation of the lateral deformation of the middle rock pillar is also utilized, the integrity, the stability, the lateral rigidity and the bearing capacity of the middle rock pillar are further fully improved, and the overall safety and the economical efficiency of engineering are enhanced.
2. The clamping and reinforcing bent frame for the middle rock pillar of the large-section small-clear-distance tunnel avoids the adoption of a multi-arch tunnel form, namely a three-pilot tunnel form or a middle pilot tunnel form, so that the construction difficulty is reduced, the construction period is shortened, the construction cost is saved, and the later-period problems of poor waterproof treatment effect and the like at the joint of the middle pilot tunnel and the main tunnel are avoided.
Drawings
Fig. 1 is an axial view of a clamping reinforcement bent according to an embodiment of the present invention.
Fig. 2 is a schematic sectional view illustrating an installation effect of the clamping reinforcing bent according to an embodiment of the present invention.
Fig. 3 is a front elevational view of a clamping reinforcement bent in accordance with an embodiment of the present invention.
Fig. 4 is a schematic reverse side elevational view of a clip reinforced bent in accordance with an embodiment of the present invention.
FIG. 5 is a side view of a clamping reinforcement bent in accordance with an embodiment of the present invention.
Fig. 6 is a schematic view of a shelving board according to an embodiment of the invention.
Fig. 7 is a schematic perspective view of a split screw according to an embodiment of the present invention.
Fig. 8 is a schematic perspective view of a nut block 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 an axial view of a clamping reinforcement bent according to another embodiment of the present invention.
Fig. 11 is a sectional view illustrating an installation effect of a clamping reinforcing bent according to another embodiment of the present invention.
Fig. 12 is a front elevational view of a clip reinforced bent in accordance with another embodiment of the present invention.
Fig. 13 is a schematic reverse elevational view of a clip reinforced bent according to another embodiment of the present invention.
Fig. 14 is a side view of a clamping reinforcing bent according to another embodiment of the present invention.
Fig. 15 is a schematic perspective view of a row shelf plate according to another embodiment of the present invention.
Fig. 16 is a perspective view of a first nut block according to another embodiment of the invention.
Fig. 17 is a perspective view of a first nut block according to another embodiment of the present invention.
Fig. 18 is a perspective view of a second nut block according to another embodiment of the invention.
Fig. 19 is a perspective view of a second nut block according to another 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, and all other embodiments obtained by a person of ordinary skill in the art without any inventive work, belong to the scope of protection of the present invention.
Example 1
As shown in fig. 1 to 9, the clamping and reinforcing bent frame of the middle rock pillar of the large-section small-clearance tunnel according to the preferred embodiment of the present invention comprises: the row frame plate 1, the split bolt 2, the nut cushion block 3 and the nut cushion block 4. Wherein, the quantity of framed bent board 1 is two, and two framed bent board 1 symmetrical arrangement are in the both sides of centre gripping reinforcing framed bent 10, and the quantity of split bolt 2 is many sets, and many sets are transversely worn to establish in two framed bent boards 1 to split bolt 2, and every set of split bolt 2 stretches out and is provided with nut cushion 3 and nut cushion 4 respectively in the both ends in two framed bent board 1 outsides to through screwing up nut fixed clamp. And wherein, eight right-angled triangle's bent plate fretworks 5 are seted up on every bent plate 1 to be central symmetry to make bent plate 1 form four outer frames and inside forms rice style of calligraphy bearing structure, bent plate 1 inner wall and the outer wall of tunnel preliminary bracing 12 that tunnel middle rock pillar 11 corresponds are laminated mutually. Under the combined action of the bent frame plate 1, the split bolt 2 and the matched nut cushion block 3 and 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 transverse force required for reinforcement, so that the integrity, stability, lateral rigidity and bearing capacity of the tunnel middle rock pillar 11 are improved.
In the above scheme, the bent plate 1 is a square vertical plane plate, the bent plate hollows 5 are isosceles right triangles, and the purpose of arranging the bent plate hollows 5 is to reduce the overall weight and the steel consumption under the condition of ensuring the strength and the deformation resistance of the bent plate 1. And be nine framed bent board bolt holes 6 that central symmetry arranged on framed bent board 1, framed bent board bolt holes 6 become the triplex row three row arrangement, and one of them framed bent board bolt hole 6 sets up in framed bent board 1's center, and eight framed bent board bolt holes 6 set up respectively in framed bent board 1's four angles and four outer frame's center in addition, wear to be equipped with one set of split bolt 2 in every framed bent board bolt hole 6 respectively.
Furthermore, the nine sets of split bolts 2 are identical in specification and size, and the split bolts 2 are high-strength bolts. 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 three nut cushion fixes the foot 7 and is central symmetry around nut cushion bolt hole 8 and arranges. Set up the aim at of nut cushion fixed foot 7 and will alternate behind the nut cushion bolt hole 8 to stay bolt 2, avoid the screw rod to rotate with one heart thereupon when screwing up the nut, nut cushion fixed foot 7 can the fixed nut, the guarantee is to tightening of stay bolt 2. The nut cushion block bolt holes 8 are the same as the apertures of the bent frame plate bolt holes 6 and are concentric with the holding positions, and the back surfaces of the nut cushion blocks 3 are connected with the bent frame plate 1 in a welding mode. 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, and the square steel sheet center department of second has seted up nut cushion bolt hole 9, and nut cushion bolt hole 9 is the same with the aperture of framed bent board bolt hole 6 and the holding position is concentric, and the back of nut cushion 4 is with framed bent board 1 welded connection.
Furthermore, the length of each outer frame of the bent plate 1 is equal and is 2000-4000mm, the thickness of the bent plate 1 is 30-50mm, the length of the hollow 5 right-angle side of the bent plate is 600-1200mm, the distance from the hollow 5 right-angle side to the outer contour is 150-300mm, the vertical distance from the center of the bent plate bolt hole 6 to the outer contour is 75-150mm, and the diameter of the bent plate bolt hole 6 is 56 mm.
Furthermore, the split bolt 2 is an M56 type 12.9-grade high-strength bolt, the diameter of the smooth part of the screw is 56mm, and the length of the smooth part is 1000mm-3000 mm.
Furthermore, the outer contour edge length of the 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 the nut cushion block bolt hole 8 positioned at the center of the first square steel plate is 56mm, the sizes of the three nut cushion block fixing feet 7 which are arranged in central symmetry are 50mm × 15mm × 35mm, and the vertical 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. 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 in the center of the steel plate is 56 mm.
Example 2
In this embodiment, as shown in fig. 10 to 19, the bent plate 1 is a curved plate bent outward, the inner wall of the plate 1 attached to the tunnel primary support 12 is curved, the distance between the upper and lower outer frames of the two plate 1 is greater than the distance between the middle portions of the two plate 1, the outer contour of the planar projection of the plate 1 is rectangular, and nine plate bolt holes 6 and eight plate hollows 5 projected as isosceles right triangles are symmetrically arranged on each plate 1 in the projection center.
Further, the split bolts include first split bolts 21 and second split bolts 22, wherein the number of first split bolts 21 is six, the specification and size of six first split bolts 21 are the same, and six first split bolts 21 are respectively arranged at four corners of the row frame plate 1 and the centers of the upper and lower outer frames, the number of second split bolts 22 is three, the specification and size of three second split bolts 22 are the same, and three second split bolts 22 are respectively arranged at the centers of the row frame plate 1 and the centers of the left and right outer frames, wherein the length of the first split bolts 21 is greater than the length of the second split bolts 22.
Further, the nut cushion blocks 3 comprise first nut cushion blocks 31 and second nut cushion blocks 32, the nut cushion blocks 4 comprise first nut cushion blocks 41 and second nut cushion blocks 42, the first pair of tie bolts 21 extend out of two row frame plates 1, two ends of the first pair of tie bolts 21 extend out of the two row frame plates 1, and the first nut cushion blocks 31 and the first nut cushion blocks 41 are arranged respectively, and the second pair of tie bolts 22 extend out of two row frame plates 1, two ends of the second pair of tie bolts 22 extend out of the two row frame plates 1, and two ends of the second pair of tie bolts 22 are provided with.
Further, first nut cushion block 31 includes that a front is square, the cross-section is right trapezoid's first steel sheet, the welding has three first nut cushion block fixed foot 71 on the first steel sheet, three first nut cushion block fixed foot 71 is central symmetry around first nut cushion block bolt hole 81 and arranges, first nut cushion block fixed foot 71 can alternate first a pair of stay bolt 21 behind first nut cushion block bolt hole 81, avoid the screw rod to rotate with one heart thereupon when screwing up the nut, first nut cushion block fixed foot 71 can the fixation nut, ensure screwing up of first a pair of stay bolt 21. The first nut cushion block bolt holes 81 are the same as the apertures of the bent plate bolt holes 6 and are concentric in position, the back face of the first nut cushion block 31 is the face with one side of a trapezoidal bevel edge, and after the back face of the first nut cushion block 31 is welded to the bent plate 1, the front face of the first nut cushion block 31 is still perpendicular to the axis direction of the first counter stay bolt 21. The second nut cushion block 32 comprises a third square steel plate and three second nut cushion block fixing feet 72 welded to the third square steel plate, the three second nut cushion block fixing feet 72 are arranged in a central symmetry mode around a second nut cushion block bolt hole 82, the second nut cushion block fixing feet 72 can penetrate through a second counter pull bolt 22 through the second nut cushion block bolt hole 82, the screw is prevented from rotating concentrically when the nut is screwed, the second nut cushion block fixing feet 72 can fix a nut, and the second counter pull bolt 22 is guaranteed to be screwed. The second nut block bolt holes 82 have the same hole diameter as the bent plate bolt holes 6 and are concentrically positioned with each other, and the second nut blocks 32 are welded to the bent plate 1.
Further, first nut cushion 41 includes that a front is square, the cross-section is right trapezoid's second steel sheet, the size of second steel sheet is the same with the size of first steel sheet, first nut cushion bolt hole 91 has been seted up to second steel sheet center department, first nut cushion bolt hole 91 is the same with framed bent board bolt hole 6's aperture and keeps the position concentric, the back of first nut cushion 41 is trapezoidal hypotenuse one side place face, after the back of first nut cushion 41 with framed bent board 1 welded connection, the front of first nut cushion 41 still keeps perpendicular with first split bolt 21's axis direction. The second nut cushion block 42 comprises a fourth square steel plate, the size of the fourth square steel plate is the same as that of the third square steel plate, a second nut cushion block bolt hole 92 is formed in the center of the fourth square steel plate, the second nut cushion block bolt hole 92 is the same as the aperture of the bent plate bolt hole 6 and keeps the position concentric, and the second nut cushion block 42 is in welded connection with the bent plate 1.
Further, the arc diameter range of the inner wall of the curved rack plate 1 attached to the tunnel primary support 12 is 10000mm-20000mm, the tangent planes of the upper and lower outer contours of the curved rack plate 1 are perpendicular to the axial direction of the rack plate bolt holes 6, the length of the plane projection right-angle edge of the rack plate hollow 5 is 600-1200mm, the distance from the plane projection right-angle edge to the outer contour is 150-300mm, the vertical distance from the center of the rack plate bolt hole 6 to the outer contour is 75-150mm, and the diameter of the rack plate bolt hole 6 is 56 mm.
Furthermore, the first pair of pull bolts 21 are M56 type 12.9-level high-strength bolts, the diameter of the smooth part of the screw rod is 56mm, and the length of the smooth part is 2000mm-4000 mm; the second pair of pull bolts 22 are M56 type 12.9-grade high-strength bolts, the diameter of the smooth part of the screw is 56mm, and the length is 1000mm-3000 mm.
Furthermore, the length of the front square outer contour edge of the first steel plate of the first nut cushion block 31 is 150-300mm, the length of the long side of the section trapezoid is 70-100mm, the length of the short side of the section trapezoid is 20-50mm, the acute angle of the trapezoid is adjusted along with the radian of the bent row frame plate 1, the angle range is 45-90 degrees, the diameter of the first nut cushion block bolt hole 81 positioned in the center of the first steel plate is 56mm, the size of the three first nut cushion block fixing feet 71 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 the first nut cushion block fixing foot 71 to the center of the first nut cushion block bolt hole 81 is 45 mm; the outer contour edge length of the second steel plate of the second nut cushion block 32 is 150-300mm, the thickness of the first square steel plate of the second nut cushion block 32 is 20-40mm, the diameter of the second nut cushion block bolt hole 82 positioned at the center of the first square steel plate is 56mm, the size of the three second nut cushion block fixing feet 72 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 second nut cushion block fixing foot 72 to the center of the second nut cushion block bolt hole 82 is 45 mm.
Furthermore, the length of the square outer contour edge of the front surface of the second steel plate of the first nut cushion block 41 is 150-300mm, the length of the long side of the trapezoid of the section is 70-100mm, the length of the short side of the trapezoid is 20-50mm, the acute angle of the trapezoid is adjusted along with the radian of the curved rack plate 1, the angle range is 45-90 degrees, and the diameter of the bolt hole 82 of the second nut cushion block positioned in the center of the second steel plate is 56 mm. The outer contour edge length of the second square steel plate of the second nut cushion block 42 is 150-300mm, the thickness of the second square steel plate of the second nut cushion block 42 is 20-40mm, and the diameter of the second nut cushion block bolt hole 82 located in the center of the second square steel plate is 56 mm.
Example 3
The clamping and reinforcing bent frame has wide application field, and can be applied to the fields of highway mountain tunnels, railway mountain tunnels, urban rail transit, urban underground engineering tunnels in the category of comprehensive underground pipe galleries and the like. The application of the middle rock pillar straight clamping reinforcing bent frame for the large-section small-clearance tunnel in the mountain tunnel engineering construction is explained below.
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). The scheme design for clamping and reinforcing the middle rock pillar of the double-tunnel is carried out by adopting the straight clamping and reinforcing bent frame of the middle rock pillar for the large-section small-clear-distance tunnel, and the following application examples are provided.
In this embodiment, the construction method for clamping and reinforcing the bent frame of the middle rock pillar of the large-section small-clear-distance tunnel specifically comprises the following steps:
the method comprises the following steps: before the clamping and 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 excavation of the rear tunnel is carried out, and after the depth reaches 2000mm and the tunnel primary support 12 of the rear tunnel is carried out, the clamping and reinforcing bent 10 is positioned before installation through a total station.
Step two: drilling the tunnel primary support 12 and the tunnel middle rock pillar 11: after the installation position of the clamping and reinforcing bent frame 10 is determined, holes are drilled 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 grouting holes are formed in one side, where each drilling nut is installed, at an angle of 45 degrees.
Step three: mounting the clamping and reinforcing bent 10 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.
Step four: 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.
Step five: 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.
Further, after the installation of the straight clamping and reinforcing bent frame 10 is completed, tunneling is continuously carried out and installation is continuously carried out, timely installation of the straight clamping and reinforcing bent frame for the middle rock pillar of the large-section small-clear-distance tunnel is guaranteed, deformation monitoring of the middle rock pillar is enhanced in the installation process and after the installation is completed, and stress reliability and safety of the middle rock pillar are guaranteed.
Example 4
In this embodiment, the construction method for clamping and reinforcing the bent frame of the middle rock pillar of the large-section small-clear-distance tunnel specifically comprises the following steps:
the method comprises the following steps: before the clamping and 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 excavation of the backward tunnel is carried out, and after the depth reaches 2000mm and the tunnel primary support 12 of the backward tunnel is carried out, the clamping and reinforcing bent 10 is positioned before installation through a total station.
Step two: drilling the tunnel primary support 12 and the tunnel middle rock pillar 11: after the installation position of the bent clamping reinforcing bent frame 10 is determined, holes are drilled in the tunnel primary support 12 and the tunnel middle rock pillar 11 corresponding to the installation positions of the six sets of first counter stay bolts 21 and the three sets of second counter stay bolts 22 until the holes are communicated with each other, and meanwhile, a section of grouting hole with a short length is obliquely formed in one side, provided with each drilling nut, of the installation position at an angle of 45 degrees.
Step three: the clamping and reinforcing bent 10 is mounted in place: the bent plate 1 welded with the first nut cushion block 31, the second nut cushion block 32, the first nut cushion block 41 and the second nut cushion block 42 is respectively placed at the installation position outside the tunnel preliminary bracing 12.
Step four: the first tie bolt 21 is installed and fastened: the first pair of pull bolts 21 sequentially penetrate through the first nut cushion block bolt holes 81, 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 first nut cushion block bolt holes 91, nuts are installed and screwed, six sets of the first pair of pull bolts 21 are uniformly and synchronously screwed to 1050 kg.m, and the opposite-pulling reinforcement is completed.
Step five: mounting and fastening the second pair of tie bolts 22: and sequentially inserting the second counter-pulling bolts 22 through the second nut cushion block bolt holes 82, the bent frame plate bolt holes 6, the tunnel primary support and tunnel middle rock pillar drill through holes, the bent frame plate bolt holes 6 and the second nut cushion block bolt holes 92, installing and screwing nuts, uniformly and synchronously screwing three sets of the second counter-pulling bolts 22, and finishing counter-pulling reinforcement.
Step six: grouting and sealing: and grouting is carried out through the grouting holes, waterproof slurry is fully injected into the bolt drilling holes, the grouting holes are blocked, waterproof materials such as acrylic acid, epoxy or polyurethane are coated on the outer sides of the nuts and the nuts of the first pair of stay bolts 21 and the second pair of stay bolts 22 for waterproof treatment, and the waterproof materials are coated to sufficiently cover the first nut cushion block 31, the second nut cushion block 32, the first nut cushion block 41 and the second nut cushion block 42.
Further, after the installation of the curved clamping and reinforcing bent frame 10 is completed, tunneling is continuously carried out and installation is continuously carried out, timely installation of the curved clamping and reinforcing bent frame for the middle rock pillar of the large-section small-clear-distance tunnel is guaranteed, deformation monitoring of the middle rock pillar is enhanced in the installation process and after the installation is completed, and stress reliability and safety of the middle rock pillar are guaranteed.
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 (10)
1. The utility model provides a framed bent is consolidated to centre gripping of rock pillar in middle of big section little clear distance tunnel which characterized in that: the method comprises the following steps: the rack plate, the split bolts, the nut cushion blocks and the nut cushion blocks;
the number of the bent frame plates is two, the two bent frame plates are symmetrically arranged on two sides of a clamping and reinforcing bent frame, the number of the counter bolts is multiple, multiple sets of the counter bolts transversely penetrate through the two bent frame plates, and the two ends, extending out of the outer sides of the two bent frame plates, of each set of the counter bolts are respectively provided with a nut cushion block and are fixedly clamped by screwing nuts;
and eight bent plate hollows are arranged on each bent plate in a centrosymmetric manner, so that the bent plates form four outer frames and form a support structure in a shape like a Chinese character mi inside the bent plates, and the inner walls of the bent plates are attached to the outer wall of the tunnel primary support corresponding to the middle rock pillar of the tunnel.
2. The clamping and reinforcing bent frame for the middle rock pillar of the large-section small-clear-distance tunnel according to claim 1, characterized in that: the utility model discloses a frame structure, including row frame plate, row frame plate bolt hole, row frame plate bolt.
3. The clamping and reinforcing bent frame for the middle rock pillar of the large-section small-clear-distance tunnel according to claim 2, characterized in that: the nine sets of split bolts are same in specification and size and are high-strength bolts; 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 legs welded on the first square steel plate, the three nut cushion block fixing legs are arranged around a nut cushion block bolt hole in a centrosymmetric mode, the hole diameters of the nut cushion block bolt holes are the same as those of the bent frame plate bolt holes, the nut cushion block bolt holes are concentric with the bent frame plate bolt holes, and the back faces of the nut cushion blocks are welded with the bent frame plate; the quantity of nut cushion is nine, every the nut cushion 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 the nut cushion bolt hole, the nut cushion bolt hole with the aperture of framed bent board bolt hole is the same and the holding position is concentric, just the back of nut cushion is with framed bent board welded connection.
4. The clamping and reinforcing bent frame for the middle rock pillar of the large-section small-clear-distance tunnel according to claim 1, characterized in that: the bent curved plate of framed bent board is towards the outside, and the framed bent inboard wall that laminates tunnel preliminary bracing is curved surface arc, two distance between two upper and lower outline of framed bent board is greater than two respectively distance between the middle part of framed bent board, and the plane projection outline of framed bent board is rectangle, every be projection central symmetric arrangement has nine framed bent board bolt holes and eight projections to isosceles right triangle on the framed bent board fretwork.
5. The clamping and reinforcing bent frame for the middle rock pillar of the large-section small-clear-distance tunnel according to claim 4, wherein: the split bolts comprise a first split bolt and a second split bolt, wherein the number of the first split bolt is six, the six first split bolts are identical in specification and size and are respectively arranged at four corners of the row frame plate and the centers of the upper outer frame and the lower outer frame, the number of the second split bolts is three, the second split bolts are identical in specification and size and are respectively arranged at the center of the row frame plate and the center of the left outer frame and the right outer frame, and the length of the first split bolts is larger than that of the second split bolts.
6. The clamping and reinforcing bent frame for the middle rock pillar of the large-section small-clear-distance tunnel according to claim 5, wherein: the nut cushion blocks comprise first nut cushion blocks and second nut cushion blocks, the first pair of pull bolts stretch out of two ends of the outer side of the row frame plate and are respectively provided with the first nut cushion blocks and the first nut cushion blocks, and the second pair of pull bolts stretch out of two ends of the outer side of the row frame plate and are respectively provided with the second nut cushion blocks and the second nut cushion blocks.
7. The clamping and reinforcing bent frame for the middle rock pillar of the large-section small-clear-distance tunnel according to claim 6, wherein: the first nut cushion block comprises a first steel plate with a square front surface and a right trapezoid cross section, three first nut cushion block fixing pins are welded on the first steel plate, the three first nut cushion block fixing pins are arranged around a first nut cushion block bolt hole in a central symmetry manner, the first nut cushion block bolt hole is the same as the aperture of the framed bent plate bolt hole and keeps concentric with the position, the back surface of the first nut cushion block is the surface where one side of a trapezoid bevel edge is located, and after the back surface of the first nut cushion block is welded and connected with the framed bent plate, the front surface of the first nut cushion block is still perpendicular to the axial direction of the first split bolt; the second nut cushion block comprises a third square steel plate and three second nut cushion block fixing legs welded and connected to the third square steel plate, the second nut cushion block fixing legs are arranged in a central symmetry mode around a second nut cushion block bolt hole, the second nut cushion block bolt hole is the same in aperture of the bent plate bolt hole, the position of the bent plate bolt hole is kept concentric, and the second nut cushion block is welded and connected to the bent plate.
8. The clamping and reinforcing bent frame for the middle rock pillar of the large-section small-clear-distance tunnel according to claim 7, wherein: the first nut cushion block comprises a second steel plate with a square front surface and a right trapezoid cross section, the size of the second steel plate is the same as that of the first steel plate, a first nut cushion block bolt hole is formed in the center of the second steel plate, the first nut cushion block bolt hole is the same as the aperture of the bent frame plate bolt hole and keeps concentric with the bent frame plate bolt hole, the back surface of the first nut cushion block is the surface where one side of a trapezoid inclined edge is located, and after the back surface of the first nut cushion block is welded and connected with the bent frame plate, the front surface of the first nut cushion block is still perpendicular to the axial direction of the first pair of pull bolts; the second nut cushion includes the square steel sheet of fourth, and the size of the square steel sheet of fourth is the same with the size of third square steel sheet, and the center department of the square steel sheet of fourth has seted up second nut cushion bolt hole, second nut cushion bolt hole with the aperture of framed bent board bolt hole is the same and the holding position is concentric, the second nut cushion with framed bent board welded connection.
9. A construction method for clamping and reinforcing bent frames of large-section small-clear-distance tunnel middle rock pillars is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: the measurement and positioning are carried out before the clamping and reinforcing bent frame is installed: after the excavation of the front tunnel of the large-section small-clear-distance tunnel is finished and the primary tunnel support is completed, excavating and excavating the backward tunnel, and after the depth reaches 2000mm and the primary tunnel support of the backward tunnel is performed, positioning the clamping and reinforcing bent before installation;
step two: drilling a tunnel primary support and a tunnel middle rock pillar: after the installation position of the clamping and reinforcing bent frame is determined, drilling holes in a tunnel primary support and a tunnel middle rock pillar corresponding to the installation position of the sleeve split bolt until the holes are communicated, and simultaneously, forming grouting holes in 45-degree inclined positions on one side where each drilling nut is installed;
step three: installing the clamping and reinforcing bent frame in place: respectively installing the bent frame plates welded with the nut cushion blocks and the nut cushion blocks at the installation positions outside the primary support of the tunnel;
step four: installing and fastening split bolts: the split bolts sequentially penetrate through nut cushion block bolt holes, bent plate bolt holes, tunnel primary support and tunnel middle rock pillar drill through holes, bent plate bolt holes and nut cushion block bolt holes, nuts are installed and screwed, nine sets of split bolts are uniformly and synchronously screwed, and split reinforcement is completed;
step five: grouting and sealing: and grouting through the grouting holes, fully grouting waterproof slurry into the bolt drilling holes, plugging the grouting holes, and performing waterproof treatment on the outer sides of the nuts and the nuts of the split bolts.
10. A construction method for clamping and reinforcing bent frames of large-section small-clear-distance tunnel middle rock pillars is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: the measurement and positioning are carried out before the clamping and reinforcing bent frame is installed: after the excavation of the front tunnel of the large-section small-clear-distance tunnel is finished and the primary tunnel support is completed, excavating and excavating the backward tunnel, and after the depth reaches 2000mm and the primary tunnel support of the backward tunnel is performed, positioning the clamping and reinforcing bent before installation;
step two: drilling a tunnel primary support and a tunnel middle rock pillar: after the installation position of the bent clamping and reinforcing bent frame is determined, drilling holes in a tunnel primary support and a tunnel middle rock pillar corresponding to the installation positions of six sets of first counter stay bolts and three sets of second counter stay bolts until two holes are communicated, and simultaneously, forming grouting holes on one side of each drilling nut in an inclined mode at an angle of 45 degrees;
step three: the clamping and reinforcing bent frame is installed in place: respectively placing the bent frame plates welded with the first nut cushion block, the second nut cushion block, the first nut cushion block and the second nut cushion block at the installation positions outside the primary support of the tunnel;
step four: installing and fastening a first counter bolt: sequentially inserting a first pair of pull bolts through a first nut cushion block bolt hole, a bent frame plate bolt hole, a tunnel primary support and tunnel middle rock pillar drill through hole, a bent frame plate bolt hole and a first nut cushion block bolt hole, installing and screwing nuts, uniformly and synchronously screwing six sets of first pair of pull bolts, and completing opposite-pull reinforcement;
step five: installing and fastening a second split bolt: sequentially inserting a second counter-pulling bolt through a second nut cushion block bolt hole, a bent frame plate bolt hole, a tunnel primary support and tunnel middle rock pillar drill through hole, a bent frame plate bolt hole and a second nut cushion block bolt hole, installing and screwing nuts, sleeving the second counter-pulling bolt, uniformly and synchronously screwing, and finishing counter-pulling reinforcement;
step six: grouting and sealing: and grouting is carried out through the grouting holes, waterproof slurry is fully injected into the bolt drilling holes, the grouting holes are blocked, and waterproof treatment is carried out on the outer sides of the nuts and the nuts of the first pair of stay bolts and the second pair of stay bolts.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110345421.8A CN113047865A (en) | 2021-03-31 | 2021-03-31 | 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 |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110345421.8A CN113047865A (en) | 2021-03-31 | 2021-03-31 | 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 |
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Application publication date: 20210629 |