Combined pre-reinforcement and construction method for shallow-buried tunnel penetrating through gravelly soil gully

Abstract

The invention relates to a combined pre-reinforcement and construction method for a shallow-buried tunnel penetrating through a gravelly soil gully. The combined pre-reinforcement and construction method comprises a double-layer small guide pipe support, a grouting pipe stabilizing support, a rib plate connected steel arch, an in-hole concrete pumping gully reinforcing device and a reserved post-cast strip hanging type formwork system. The steel arch segments on the side wall of the tunnel are assembled to form a steel arch; the double-layer small conduit support is mounted on the outer wall of the tunnel top; the top of the grouting pipe stabilizing support is connected with a grouting guide pipe, and the grouting guide pipe penetrates through the steel arch. Butt joint plates are welded on the side edges of each group of steel arch sections in the rib plate connected steel arch; the in-hole concrete pumping gully reinforcing device comprises a ground pump and a guide pipe. A prefabricated waterproof plate is arranged at the bottom of the reserved post-cast strip hanging type formwork system. The method has the beneficial effects that the advance support of the double-layer small guide pipe is realized; the rib plate connected steel arch frame technology is adopted, and the stability of the steel arch frame is guaranteed through double fixation; the stability of the in-hole pumping system structure is guaranteed through the in-hole concrete pumping gully reinforcing technology.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of tunnel pre-reinforcement construction, and particularly relates to a combined pre-reinforcement and construction method for a shallow-buried tunnel crossing a gravel soil gully. BACKGROUND

[0002] The construction conditions of a mountain tunnel are extremely complex, and in particular, a shallow-buried tunnel in a gully section has a great risk of collapse and roof fall, is long-term subjected to surface water erosion and leakage, and is prone to form a water seepage channel. Since the height of the natural equilibrium arch ring of the shallow-buried section of the tunnel is affected by the thickness of the rock stratum, the arch ring does not fully form and play a supporting role, and therefore, anti-collapse reinforcement measures are an important guarantee for the safe crossing of the shallow-buried section of the tunnel.

[0003] The technical measures for tunnel construction under simple adverse geological conditions are currently relatively mature, but there are few tunnel construction methods for multiple adverse geological conditions, and therefore, it is necessary to innovate the combined pre-reinforcement and construction method for a shallow-buried tunnel crossing a gravel soil gully to guide future tunnel engineering construction. SUMMARY

[0004] The present application aims to overcome the deficiencies in the prior art and provide a combined pre-reinforcement and construction method for a shallow-buried tunnel crossing a gravel soil gully.

[0005] The combined pre-reinforcement system for the shallow-buried tunnel crossing the gravel soil gully comprises double-layer small duct supports, grouting pipe stable supports, ribbed plate connected steel arch supports, in-hole pumped concrete gully reinforcement devices, and a reserved post-poured strip hanging formwork system. A tunnel is arranged between a permanent gully and an original gully, steel arch support segments are arranged on the side walls of the tunnel, and the steel arch support segments are combined into a steel arch support. The double-layer small duct supports are installed on the outer walls of the top of the tunnel. The grouting pipe stable supports are connected with grouting ducts at the top thereof, and the grouting ducts penetrate into the steel arch support. The ribbed plate connected steel arch supports are welded with butt plates on the side edges of each group of steel arch support segments. The in-hole pumped concrete gully reinforcement devices comprise a ground pump and a duct. The ground pump is installed at the bottom of the tunnel, and the duct is connected to the ground pump on both sides thereof. The reserved post-poured strip hanging formwork system is provided with a prefabricated waterproof plate at the bottom thereof, and the prefabricated waterproof plate is connected with an expansion formwork at the top thereof.

[0006] Preferably, the double-layer small duct supports comprise grouting pipe stable supports. Double-layer grouting holes are arranged on the side walls of the steel arch support, and the double-layer grouting holes are penetrated by grouting ducts. The bottom of the grouting pipe stable support is provided with a bearing plate, the top of the bearing plate is connected with an adjusting rod, the top end of the adjusting rod is connected with a bottom plate, the two sides of the bottom plate are provided with expansion tracks, the expansion tracks are slotted with guide sliding grooves in the middle thereof, adjusting blocks are slidingly connected in the guide sliding grooves, the top of each adjusting block is connected with an inclined plate, and the two ends of the inclined plate are fixed with positioning frames. Lower arc-shaped limiting plates are welded on the top ends of the two sides of the positioning frames, and upper arc-shaped limiting plates are arranged above the lower arc-shaped limiting plates. The upper arc-shaped limiting plates and the lower arc-shaped limiting plates are both provided with reserved through holes, and the reserved through holes are respectively penetrated by the grouting ducts.

[0007] As preferred, the load-bearing plate and the steel arch are flush at the bottom end; the load-bearing plate is provided with a pull rod at both ends and connected with a U-shaped fixing groove, and the steel arch is fixed through the U-shaped fixing groove; the grouting pipe is staggered in two layers; the positioning frame is connected with an expansion rod at the top, and the expansion rod is fixed with an upper arc-shaped limiting plate at the top.

[0008] As preferred, the steel arch comprises steel arch segments; the steel arch segments are assembled into a steel arch, and butt plates are welded on the side edges of each group of steel arch segments; a rib plate is connected between the side walls of a pair of steel arch segments and fixed on the butt plate, and a jacking device is symmetrically installed on the top and bottom of the rib plate, the jacking device comprising a sliding rail and a bolt; the sliding rail is welded on the edge of the side wall of the steel arch segment, a sliding block is slidably connected in the sliding rail, an expansion inclined rod is installed on the sliding block, a jacking end plate is fixed on the other end of the expansion inclined rod, and the jacking end plate is fixed on the rib plate through the bolt.

[0009] As preferred, a pressure-bearing plate is welded on the bottom of the steel arch segment, a threaded sleeve is installed on the top of the pressure-bearing plate, and an elastic anchor rod is fixed on the threaded sleeve; the rib plate is provided with a reserved through hole, and the elastic anchor rod penetrates through the reserved through hole.

[0010] As preferred, a temporary foundation is arranged at the bottom of the tunnel, and a temporary road is arranged on the top of the temporary foundation; a ground pump is arranged on the top of the temporary road, lateral pipes are connected on both sides of the ground pump, vertical pipes are connected on the other ends of the lateral pipes; the lateral pipes are provided with lateral fixing supports, and the vertical pipes are provided with a vertical fixing system; the vertical fixing system comprises a cable; a hoop is arranged on the vertical pipe, a lifting ring is connected on the hoop, a lifting ring is arranged on the top of the ground pump, and the cable is connected with a connecting buckle on both ends and connected with the lifting ring on the top of the vertical pipe and the ground pump respectively.

[0011] As preferred, the lateral fixing support comprises a supporting plate; the supporting plate is supported on the bottom of the lateral pipe, a supporting frame is connected on the bottom of the supporting plate, a hoop is arranged on the supporting frame, a lifting ring is connected on the hoop, and a sliding bottom plate is connected on the supporting frame; a sliding rail is arranged on the bottom of the sliding bottom plate; an expansion rod is connected between adjacent supporting frames, springs are arranged on both ends of the expansion rod and fixed with connecting buckles, and the connecting buckles and the lifting rings are connected.

[0012] As preferred, the gully tunnel section is provided with a prefabricated waterproof plate and a reserved post-cast strip hanging formwork system; the four corners of the reserved post-cast strip hanging formwork system are provided with vertical rods; the bottom of the vertical rod is provided with a pyramid which is inserted into the soil; the reserved post-cast strip hanging formwork system comprises a left post-cast strip hanging form and a right post-cast strip hanging form which are symmetrical to each other; the top of the reserved post-cast strip hanging formwork system is provided with a top support; the top support is provided with a sliding rod which is sleeved with a sliding sleeve; the bottom of the sliding sleeve is connected with a fixed rod, and the other end of the fixed rod is fixed with the left post-cast strip hanging form and the right post-cast strip hanging form; the adjacent sliding sleeves are provided with a connecting rod; the connecting rod and the top support are provided with a push rod; the post-cast strip hanging form is provided with a left telescopic formwork and a right telescopic formwork, and the side wall of the telescopic formwork is provided with an upper short plate and a lower short plate, and a jack is arranged between the two short plates.

[0013] As preferred, the bottom of the left telescopic formwork and the right telescopic formwork is uniformly provided with a plurality of limiting blocks, the top of the prefabricated waterproof plate is fixed with a special-shaped positioning block through bolts, the top of the special-shaped positioning block is provided with a limiting groove, and the limiting block is arranged in the limiting groove; the side wall of the left post-cast strip hanging form and the right post-cast strip hanging form is respectively provided with a butt joint hole and a butt joint block which are matched in shape.

[0014] The construction method of the combined pre-reinforcement of the shallow-buried tunnel crossing the gravel soil gully is characterized in that it comprises the following steps:

[0015] Step one, a water retaining dam is built on the upstream of the gully to connect the original gully water flow to the permanent gully;

[0016] Step two, a fixed rib plate connected steel arch is installed;

[0017] Step three, the grouting pipe is penetrated through the steel arch and the top of the grouting pipe stable support, and the slurry is injected to realize double-layer small pipe support;

[0018] Step four, after the double-layer small pipe support passes through the gully, the ground pump is used to transport concrete from the inside of the tunnel to the outside of the tunnel for ground backfilling and pouring reinforcement work;

[0019] Step five, the reserved post-cast strip hanging formwork system is hung to the telescopic formwork at the required position, and the prefabricated waterproof plate-reinforced concrete gully impermeable construction is completed after the telescopic formwork is assembled.

[0020] The beneficial effects of the present application are:

[0021] 1) The invention adopts double-layer small conduit advanced support technology, the grouting pipe passes through the double-layer grouting hole arranged on the steel arch, the front and rear two layers are staggered, and the grouting pipe is precisely positioned and stably supported by using the grouting pipe stable support, the space position of the upper and lower arc limiting plates is changed by moving the adjusting rod, adjusting block and telescopic rod, the grouting pipe passes through the reserved through hole of the upper and lower arc limiting plates and the double-layer grouting hole on the steel arch in turn, and grout is injected, so that the double-layer small conduit advanced support is realized.

[0022] 2) The invention adopts ribbed plate connected steel arch technology, a butt joint plate is welded at the end of each steel arch segment, and is fixed and connected by using bolts to form a primary fixation, the steel arch segment is uniformly arranged with a jacking device to strengthen the connection of adjacent segment steel arch ribs, in order to further ensure the stability of the steel arch, a pressure bearing plate is welded on the bottom steel arch segment, a threaded sleeve is installed on the pressure bearing plate, the end of the elastic anchor rod is tightly fixed with the sleeve, and the elastic anchor rod passes through the reserved through hole on each ribbed plate in turn, and the nut on the elastic anchor rod is tightly fixed, so that a secondary fixation is formed, and the stability of the steel arch is ensured.

[0023] 3) The invention adopts in-hole pumped concrete reinforcement gully technology, after the double-layer small conduit support passes through the gully, the ground pump is used to transport concrete from the tunnel to the outside of the tunnel for surface backfilling and pouring reinforcement work; before the ground pump enters the site, a temporary road is laid, the left and right sides of the ground pump are connected with horizontal and vertical pipes, and horizontal fixing supports and vertical fixing systems are arranged to ensure the stability of the in-hole pumping system structure.

[0024] 4) The invention adopts prefabricated waterproof plate-reinforced concrete gully anti-seepage technology, the gully anti-seepage treatment adopts a prefabricated waterproof plate reserved post-cast strip closure and a hanging formwork system, the hanging formwork system is composed of a left post-cast strip hanging form and a right post-cast strip hanging form, the three-dimensional space position of the left and right post-cast strip hanging forms is changed by adjusting the length of the push rod and the fixing rod, the special-shaped positioning block is fixed on the prefabricated waterproof plate by bolts, and a plurality of limiting blocks are uniformly arranged at the bottom of the left and right forms, the limiting blocks are arranged in the limiting grooves provided on the special-shaped positioning blocks, and the installation accuracy of the forms is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a schematic view of double-layer small conduit advanced support;

[0026] Figure 2 is a structural schematic view of a grouting pipe stable support;

[0027] Figure 3 is a structural schematic view of a ribbed plate connected steel arch;

[0028] Figure 4 is a schematic view of a jacking device;

[0029] Figure 5 is Figure 3Enlarged view of the middle A section;

[0030] Figure 6 is a schematic view of pumping concrete to reinforce the gully inside the hole;

[0031] Figure 7 is a schematic view of the transverse fixing support;

[0032] Figure 8 is a schematic view of the vertical fixing system;

[0033] Figure 9 is a schematic view of the construction of the precast waterproof board-reinforced concrete gully seepage prevention;

[0034] Figure 10 is a schematic view of the structure when the hanging formwork of the reserved post-cast strip is not in place;

[0035] Figure 11 is a schematic view of the structure when the hanging formwork of the reserved post-cast strip is precisely in place;

[0036] Figure 12 is a schematic view of the structure before the left and right side telescopic formworks are assembled;

[0037] Figure 13 is a schematic view of the structure after the left and right side telescopic formworks are assembled.

[0038] Explanation of reference signs: 1-steel arch, 2-double layer grouting hole, 3-grouting guide pipe, 4-grouting pipe stable support, 5-fixing plate, 6-bearing plate, 7-telescopic track, 8-lower arc limiting plate, 9-connection plate, 10-adjusting block, 11-bottom plate, 12-guiding sliding groove, 13-upper arc limiting plate, 14-telescopic rod, 15-positioning frame, 16-inclined plate, 17-adjusting rod, 18-pull rod, 19-pressure bearing plate, 20-threaded sleeve, 21-elastic anchor rod, 22-nut, 23-steel arch segment, 24-tightening device, 25-butting plate, 26-rib plate, 27-supporting plate, 28-sliding rail, 29-sliding block, 30-telescopic inclined rod, 31-bolt, 32-tightening end plate, 33-vertical guide pipe, 34-double layer small guide pipe support, 35-tunnel, 36-temporary road, 37-ground pump, 38-temporary foundation, 39-temporary road, 40-transverse fixed support, 41-transverse guide pipe, 42-vertical fixing system, 43-sliding bottom plate, 44-hoop, 45-supporting plate, 46-suspender, 47-connection buckle, 48-spring, 49-supporting frame, 50-tension cable, 51-precast waterproof plate, 52-waterproof plate reserved post-cast strip, 53-permanent ditch, 54-water retaining dam, 55-reserved post-cast strip steel bar, 56-corner pyramid, 57-vertical rod, 58-left side post-cast strip hanging formwork, 59-top support, 60-sliding rod, 61-push rod, 62-linking rod, 63-fixing rod, 64-right side post-cast strip hanging formwork, 65-sliding sleeve, 66-limiting groove, 67-irregular positioning block, 68-left side telescopic formwork, 69-butting hole, 70-butting block, 71-right side telescopic formwork, 72-lower short plate, 73-limiting block, 74-jack, 75-upper short plate, 76-U-shaped fixing groove. DETAILED DESCRIPTION

[0039] The application will be further described below in connection with examples. The following examples are intended to help understand the application. It should be noted that for those skilled in the art, without departing from the principles of the application, a number of modifications can be made to the application, and these improvements and modifications also fall within the scope of protection of the claims of the application.

[0040] Example 1

[0041] As an embodiment, a combined pre-reinforcement system for crossing a gravel soil gully shallow tunnel is proposed, such as Figures 1-13As shown, including steel arch 1, double layer grouting hole 2, grouting pipe 3, grouting pipe stable support 4, fixed plate 5, bearing plate 6, telescopic rail 7, lower arc limiting plate 8, connecting plate 9, adjusting block 10, bottom plate 11, guide chute 12, upper arc limiting plate 13, telescopic rod 14, positioning frame 15, inclined plate 16, adjusting rod 17, pull rod 18, pressure bearing plate 19, threaded sleeve 20, elastic anchor rod 21, nut 22, steel arch segment 23, jacking device 24, butt plate 25, rib plate 26, support plate 27, slide rail 28, slide block 29, telescopic inclined rod 30, bolt 31, jacking end plate 32, vertical pipe 33, double layer small pipe support 34, tunnel 35, temporary road 36, ground pump 37, temporary foundation 38, temporary road 39, transverse fixed support 40, transverse pipe 41, vertical fixing system 42, sliding base plate 43, hoop 44, supporting plate 45, lifting ring 46, connecting buckle 47, spring 48, support frame 49, cable 50, prefabricated waterproof plate 51, waterproof plate reserved post-cast strip 52, permanent ditch 53, water retaining dam 54, reserved post-cast strip reinforcement 55, angle pyramid 56, vertical rod 57, left side post-cast hanging formwork 58, top support 59, sliding rod 60, push rod 61, connecting rod 62, fixed rod 63, right side post-cast hanging formwork 64, sliding sleeve 65, limiting groove 66, special-shaped positioning block 67, left side telescopic formwork 68, butt joint hole 69, butt joint block 70, right side telescopic formwork 71, lower short plate 72, limiting block 73, jack 74, upper short plate 75, U-shaped fixed groove 76, rib plate connected steel arch, in-hole pumped concrete reinforced gully device and reserved post-cast strip hanging formwork system; the permanent ditch 53 and the original gully are provided with a tunnel 35, the side wall of the tunnel 35 is provided with a steel arch segment 23, the steel arch segment 23 is combined into a steel arch 1; the double layer small pipe support 34 is installed on the top outer wall of the tunnel 35; the grouting pipe stable support 4 is connected with the grouting pipe 3 at the top, the grouting pipe 3 penetrates in the steel arch 1; the side edge of each steel arch segment 23 in the rib plate connected steel arch is welded with a butt plate 25; the in-hole pumped concrete reinforced gully device comprises a ground pump 37 and a pipe; the ground pump 37 is installed at the bottom of the tunnel 35, and the pipe is connected on both sides of the ground pump 37; the reserved post-cast strip hanging formwork system is provided with a prefabricated waterproof plate 51 at the bottom, and the prefabricated waterproof plate 51 is connected with a telescopic formwork at the top.

[0042] As Figure 1 and Figure 2As shown, the double-layer small duct support 34 comprises a grouting pipe stabilizing support 4; the steel arch 1 is provided with double-layer grouting holes 2 on the side wall, the double-layer grouting holes 2 are penetrated by grouting pipes 3; the bottom of the grouting pipe stabilizing support 4 is provided with a bearing plate 6, the top of the bearing plate 6 is connected with an adjusting rod 17, the top end of the adjusting rod 17 is connected with a bottom plate 11; the both sides of the bottom plate 11 are provided with telescopic rails 7, the middle of the telescopic rails 7 is slotted with a guide sliding groove 12; an adjusting block 10 is slidingly connected in the guide sliding groove 12, the top of the adjusting block 10 is connected with an inclined plate 16, the both ends of the inclined plate 16 are fixed with positioning frames 15; the both sides of the top end of the positioning frames 15 are welded with lower arc limiting plates 8, upper arc limiting plates 13 are arranged above the lower arc limiting plates 8; the upper arc limiting plates 13 and the lower arc limiting plates 8 are both provided with reserved through holes, the reserved through holes are respectively penetrated by the grouting pipes 3; the bearing plate 6 is flush with the bottom end of the steel arch 1; the both ends of the bearing plate 6 are provided with pull rods 18 and are connected with U-shaped fixing grooves 76, the steel arch 1 is fixedly penetrated in the U-shaped fixing grooves 76; the grouting pipes 3 are staggered arranged in front and back two layers; the top of the positioning frames 15 is connected with telescopic rods 14, the top of the telescopic rods 14 is fixed with the upper arc limiting plates 13; the double-layer small duct advanced support 34 penetrates the grouting pipes 3 through the double-layer grouting holes 2 arranged on the steel arch 1, the grouting pipes 3 are staggered arranged in front and back two layers, and are precisely positioned and stably supported by the grouting pipe stabilizing support 4, by moving the adjusting rod 17, the adjusting block 10 and the telescopic rod 14, the spatial positions of the upper and lower arc limiting plates 8 are changed, the grouting pipes 3 are sequentially penetrated through the reserved through holes of the upper and lower arc limiting plates 8 and the double-layer grouting holes 2 on the steel arch 1, and the grouting pipes 3 are injected with grout, so that the double-layer small duct advanced support is realized.

[0043] As Figures 3-5As shown, the steel arch 1 comprises steel arch segments 23; the steel arch segments 23 are assembled into the steel arch 1, each group of the steel arch segments 23 is welded with butt plates 25 on the side edges; the side walls between a pair of the steel arch segments 23 are connected with rib plates 26 and fixed on the butt plates 25, the rib plates 26 are symmetrically installed with top-tightening devices 24 on the top and bottom, the top-tightening device 24 comprises a sliding rail 28 and a bolt 31; the sliding rail 28 is welded on the side wall edge of the steel arch segment 23, the sliding rail 28 is slidably connected with a sliding block 29, the sliding block 29 is installed with a telescopic inclined rod 30, the telescopic inclined rod 30 is fixed with a top-tightening end plate 32 on the other end, the top-tightening end plate 32 is fixed by the bolt 31 and the rib plate 26; the steel arch segment 23 is welded with a pressure bearing plate 19 on the bottom, the pressure bearing plate 19 is installed with a threaded sleeve 20 on the top, the threaded sleeve 20 is fixed with an elastic anchor rod 21; the rib plate 26 is provided with a reserved through hole, the elastic anchor rod 21 penetrates through the reserved through hole; each steel arch segment 23 of the rib plate connected steel arch is welded with a butt plate 25 on the end, and is fixed and connected by the bolt 31, forming a double fixation, the steel arch segments 23 are uniformly provided with the top-tightening device 24, strengthening the connection of the adjacent steel arch segments 23, in order to further ensure the stability of the steel arch, the pressure bearing plate 19 is welded on the bottom steel arch segment 23, and the threaded sleeve 20 is installed thereon, the end of the elastic anchor rod 21 is tightly fixed with the threaded sleeve 20, and sequentially penetrates through the reserved through hole on each rib plate 26, and the nut 22 is tightly fixed thereon, so as to form a double fixation, ensuring the stability of the steel arch.

[0044] Embodiment two

[0045] As another embodiment, embodiment two is proposed on the basis of embodiment one, a more specific combined pre-reinforcement system for crossing the gravel soil gully shallow tunnel.

[0046] As shown in the drawings, Figures 6-8 The bottom of the tunnel 35 is provided with a temporary foundation 38, and the temporary road 39 is laid on the top of the temporary foundation 38; the ground pump 37 is arranged on the top of the temporary road 39, the lateral pipes 41 are connected on both sides of the ground pump 37, the other end of the lateral pipes 41 is connected with the vertical pipes 33; the lateral fixing supports 40 are arranged on the lateral pipes 41, and the vertical fixing systems 42 are arranged on the vertical pipes 33; the vertical fixing system 42 comprises a cable 50; the hoop 44 is arranged on the vertical pipe 33, the lifting ring 46 is connected with the hoop 44, the lifting ring 46 is arranged on the top of the ground pump 37, the cable 50 is connected with the lifting ring 46 on the top of the vertical pipe 33 and the ground pump 37 respectively through the connecting buckles 47 arranged on both ends of the cable 50;

[0047] The transverse fixing support 40 comprises a supporting plate 45; the bottom of the transverse conduit 41 is supported with the supporting plate 45, the bottom of the supporting plate 45 is connected with a supporting frame 49, the supporting frame 49 is sleeved with a hoop 44, the hoop 44 is connected with a lifting ring 46, the supporting frame 49 is connected with a sliding bottom plate 43; the bottom of the sliding bottom plate 43 is provided with a sliding rail 28; the adjacent supporting frames 49 are connected with the telescopic rods 14, the telescopic rods 14 are provided with springs 48 at two ends and fixedly connected with buckles 47, the buckles 47 and the lifting rings 46 are connected; in the technology device for pumping concrete in a hole to reinforce a gully, the double-layer small conduit support 34 is firstly passed through the gully, and then the ground pump 37 is used to convey concrete from the tunnel 35 to the outside of the tunnel 35 to perform ground backfill pouring and reinforcing work; before the ground pump 37 enters the field, the temporary road 39 is laid, the ground pump 37 is connected with the transverse conduit 41 and the vertical conduit 33 on the left and right sides, and the transverse fixing support 40 and the vertical fixing system 42 are respectively arranged to ensure the stability of the in-hole pumping system structure.

[0048] As shown in Figures 9-13 The gully tunnel 35 is provided with a prefabricated waterproof plate 51 and a reserved post-cast strip hanging formwork system; the four corners of the reserved post-cast strip hanging formwork system are provided with vertical rods 57; the bottom of the vertical rod 57 is provided with a pyramid 56, and the pyramid 56 is inserted into the soil; the reserved post-cast strip hanging formwork system comprises a left post-cast strip hanging form 58 and a right post-cast strip hanging form 64 which are symmetrical to each other; the top of the reserved post-cast strip hanging formwork system is provided with a top support 59; the top support 59 is provided with a sliding rod 60, and the sliding rod 60 is sleeved with a sliding sleeve 65; the bottom of the sliding sleeve 65 is connected with a fixed rod 63, the other end of the fixed rod 63 is fixedly connected with the left post-cast strip hanging form 58 and the right post-cast strip hanging form 64, and the adjacent sliding sleeves 65 are provided with a connecting rod 62; the connecting rod 62 and the top support 59 are provided with a push rod 61; the post-cast strip hanging form is provided with a left telescopic form 68 and a right telescopic form 71, the side wall of the telescopic form is provided with an upper short plate 75 and a lower short plate 72, and the two short plates are provided with a jack 74;

[0049] The bottoms of the left and right telescopic formworks 68 and 71 are uniformly provided with a plurality of limiting blocks 73, the prefabricated waterproof plate 51 is fixed with a special-shaped positioning block 67 at the top thereof by bolts, the special-shaped positioning block 67 is provided with a limiting groove 66 at the top thereof, and the limiting blocks 73 are arranged in the limiting groove 66; the left and right post-poured belt hanging formworks 58 and 64 are respectively provided with a butt joint hole 69 and a butt joint block 70, the butt joint hole 69 and the butt joint block 70 are matched in shape; the gully anti-seepage treatment of the prefabricated waterproof plate-reinforced concrete gully anti-seepage technology adopts a prefabricated waterproof plate 51 reserved post-poured belt sealing and a reserved post-poured belt hanging formwork system, the reserved post-poured belt hanging formwork system is composed of the left and right post-poured belt hanging formworks 58 and 64, the three-dimensional spatial positions of the left and right post-poured belt hanging formworks 58 and 64 are changed by adjusting the lengths of the push rods 61 and the fixing rods 63, the special-shaped positioning block 67 is fixed on the prefabricated waterproof plate 51 by bolts, the bottoms of the left and right telescopic formworks 68 and 71 are uniformly provided with a plurality of limiting blocks 73, the limiting blocks 73 are arranged in the limiting grooves 66 provided on the special-shaped positioning block 67, and the installation precision of the left and right telescopic formworks 68 and 71 is ensured.

[0050] It should be noted that the same or similar parts in this embodiment as in Embodiment One can be mutually referred to, and will not be described herein again.

[0051] Embodiment Three

[0052] As another embodiment, this embodiment three is based on Embodiment Two and proposes a combined pre-reinforcement construction method for a shallow-buried tunnel crossing a gully of gravel soil, as shown in Figures 1-13 The method comprises the following steps:

[0053] Step One, as shown in Figure 9 , a water retaining dam 54 is built on the upstream of the gully to connect the original gully water flow into the permanent gully 53; the water is connected into the original gully downstream through the gully modification.

[0054] Step Two, as shown in Figures 3-5As shown, the installation fixed rib plate connected steel arch; Steel arch 1 is composed of steel arch segment 23, each steel arch segment 23 end is welded butt plate 25, and is connected by bolt, forms a heavy fixed; Steel arch segment 23 end is evenly arranged rib plate 26, and installs the jacking device 24 on it, strengthens the connection of adjacent segment steel arch rib; The jacking device 24 is symmetrically arranged up and down, left and right, is composed of slide rail 28, sliding block 29, telescopic inclined rod 30, bolt 31 and jacking end plate 32, slide rail 28 is welded on the edge of steel arch segment 23 end, telescopic inclined rod 30 one end installs sliding block 29 in slide rail 28, the other end is fixed with rib plate 26 through support plate 27, according to the construction requirement on site, the position of telescopic inclined rod 30 is adjusted by sliding block 29, and the adjacent jacking device 24 up and down is fixed by bolt 31;In order to further guarantee the stability of steel arch 1, pressure plate 19 is welded on the bottom steel arch segment 23, and threaded sleeve 20 is installed on it, and elastic anchor rod 21 end is screwed and fixed with the sleeve, and is sequentially passed through the reserved through hole on each rib plate 26, and nut 22 on it is screwed, to form a double fixed.

[0055] Step three, as shown in Figure 1 And Figure 2 The grouting pipe 3 is shown in the steel arch 1 and the grouting pipe stable support 4 top, and the grout is injected, realizes double-layer small pipe support 34;Specifically, the double-layer grouting pipe 3 construction is matched with steel arch 1, the grouting pipe 3 is passed through the double-layer grouting hole 2 arranged on the steel arch 1, the front and rear two layers are staggered, and the accurate positioning and stable support are carried out by using the grouting pipe stable support 4;The bearing plate 6 of the grouting pipe stable support 4 is installed flush with the bottom end of the steel arch 1, the bearing plate 6 two ends are provided with pull rod 18 and are connected with U-shaped fixed slot 76, the grouting pipe stable support 4 is fixed with the steel arch 1 through the U-shaped fixed slot 76, and the connection is strengthened by using bolt and fixed plate 5;The bearing plate 6 is connected with the bottom plate 11 through the adjusting rod 17, the bottom plate 11 two sides are provided with telescopic track 7, the track middle is notched to form guide sliding groove 12;The adjusting block 10 is fixed with the positioning frame 15 through the inclined plate 16, and is placed in the guide sliding groove 12;The positioning frame 15 top two sides are welded with lower arc limiting plate 8, and the upper arc limiting plate 13 is fixed above the positioning frame 15 through the telescopic rod 14;By moving the adjusting rod 17, adjusting block 10 and telescopic rod 14, the spatial position of the upper and lower arc limiting plates is changed, the grouting pipe 3 is sequentially passed through the reserved through hole of the upper and lower arc limiting plates and the double-layer grouting hole 2 on the steel arch 1, and the grout is injected, realizes double-layer small pipe support 34;

[0056] Step four, as shown in Figures 6-8 The double-layer small pipe support 34 is shown in the gully, and the concrete is transported from the tunnel 35 to the outside of the tunnel 35 by using the ground pump 37 to carry out the ground backfill pouring reinforcement work;

[0057] Step five, asFigures 9-13 As shown, the pre-cast strip hanging formwork system hangs the telescopic formwork to the required position. After the telescopic formwork is assembled, the precast waterproof slab-reinforced concrete ditch seepage prevention construction is completed.

[0058] It should be noted that the parts in this embodiment that are the same as or similar to those in Embodiment 2 can be referred to each other, and will not be repeated in this application.

[0059] Example 4

[0060] As another embodiment, this fourth embodiment proposes, based on the third embodiment, a more specific construction method for combined pre-reinforcement of shallow-buried tunnels traversing gravelly soil gullies, such as... Figures 1-13 As shown, it includes the following steps:

[0061] Step 1, such as Figure 9 As shown, a water-blocking dam 54 was built upstream of the gully to divert the original gully water flow into a permanent gully 53;

[0062] Step 2, as follows Figures 3-5 As shown, the rib plate is installed on the integrated steel arch frame;

[0063] Step 3, as follows Figure 1 and Figure 2 As shown, the grouting pipe 3 is inserted through the top of the steel arch frame 1 and the grouting pipe stabilizing support 4, and grout is injected to achieve double-layer small pipe support 34;

[0064] Step 4, as follows Figures 6-8 As shown, after the double-layer small guide pipe support 34 passes through the gully, concrete is pumped from inside the tunnel 35 to outside the tunnel 35 using a ground pump 37 for surface backfilling and reinforcement. Before the ground pump 37 enters the site, a temporary foundation 38 is constructed and a temporary road 39 is laid. The ground pump 37 is connected to a transverse guide pipe 41 and a vertical guide pipe 33 on both sides, and a transverse fixed support 40 and a vertical fixing system 42 are respectively set to ensure the stability of the pumping system structure inside the tunnel. The transverse fixed support 40 supports the transverse guide pipe 41 using a support plate 45 and is connected to the sliding base plate 43 through a support frame 49. Adjacent support frames 49 are connected by a telescopic rod 14, and springs are provided at both ends of the telescopic rod 14. 48 is fixed with connecting buckle 47, which is fastened to the lifting ring 46 on clamp 44; sliding base plate 43 is placed in the slide rail 28 at the bottom. According to the on-site construction conditions, the distance between adjacent horizontal fixed supports 40 is adjusted by moving the relative position of sliding base plate 43 to ensure the stability of the horizontal support structure; vertical fixing system 42 consists of clamp 44, lifting ring 46, connecting buckle 47 and cable 50. Several clamps 44 with lifting ring 46 are evenly distributed on vertical guide tube 33. The top of ground pump 37 is equipped with lifting ring 46. Connecting buckles 47 are installed at both ends of cable 50, which are fastened to the vertical guide tube 33 and the lifting ring 46 on ground pump 37 respectively.

[0065] Step five, as shown in Figures 9-13 Figures 1-13 Figure 9 Figures 3-5 Figure 1 Figure 2 Figures 6-8 Figures 9-13 Figures 1-13 Figure 9 Figures 3-5 Figure 1 Figure 2 Figures 6-8 Figures 9-13 Figures The precast waterproof plate-steel reinforced concrete gully anti-seepage construction is completed after the telescopic formwork is assembled. Specifically, the waterproof plate reserved post-cast strip 52 is obtained through the reserved post-cast strip hanging formwork system. The gully anti-seepage treatment adopts the precast waterproof plate 51 reserved post-cast strip sealing and the hanging formwork system. The hanging formwork system is composed of the left post-cast strip hanging form 58 and the right post-cast strip hanging form 64. The vertical rod 57 is quickly placed in the soil through the corner 56, and the top support 59 is installed to form the post-cast strip hanging formwork support. The top support 59 is symmetrically arranged with the sliding rod 60. One end of the fixed rod 63 is fixed with the left post-cast strip hanging form 58 and the right post-cast strip hanging form 64, and the other end is connected with the sliding rod 60 through the sliding sleeve 65. The connecting rod 62 is installed between adjacent sliding sleeves 65. A pair of push rods 61 are arranged between the connecting rod 62 and the top support 59. The three-dimensional spatial position of the left and right post-cast strip hanging forms 64 is changed by adjusting the length of the push rod 61 and the fixed rod 63. The left and right post-cast strip hanging forms 64 are composed of two symmetrically arranged formworks. The left telescopic formwork 68 and the right telescopic formwork 71 are both installed with the upper short plate 75 and the lower short plate 72, and the jack 74 is installed between the two short plates to adjust the height of the left and right formworks. The special-shaped positioning block 67 is fixed on the precast waterproof plate 51 by bolts. The bottom of the left and right formworks is uniformly arranged with a plurality of limiting blocks 73, which are arranged in the limiting grooves 66 provided on the special-shaped positioning block 67. The left and right post-cast strip hanging forms 64 are connected through the connecting holes 69 and the connecting blocks 70 to ensure close connection.

[0066] It should be noted that the same or similar parts in this embodiment and example three can be mutually referred to, and will not be described in detail in this application.

[0067] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be mutually referred to.

Claims

1. A combined pre-reinforcement system for shallow buried tunnel crossing gully of gravel soil, characterized in that, The tunnel comprises a double-layer small conduit support, a grouting pipe stable support, a ribbed plate connected steel arch, a hole-pumped concrete reinforcing gully device and a reserved post-poured strip hanging formwork system; a tunnel is arranged between the permanent gully and the original gully, steel arch segments are arranged on the side walls of the tunnel, and the steel arch segments are assembled into a steel arch; The double-layer small conduit support is arranged on the outer wall of the top of the tunnel; the grouting pipe stable support is connected with a grouting conduit at the top; the ribbed plate connected steel arch is welded with butt plates on the side edges of each group of steel arch segments; the hole-pumped concrete reinforcing gully device comprises a ground pump and a conduit; the ground pump is arranged at the bottom of the tunnel, and the conduit is connected to the two sides of the ground pump; the reserved post-poured strip hanging formwork system is provided with a prefabricated waterproof plate at the bottom, and the prefabricated waterproof plate is connected with an expansion formwork at the top.

2. The combined pre-reinforcement system for the shallow-buried tunnel crossing the gully of the gravel soil according to claim 1, characterized in that, The double-layer small conduit support comprises a grouting pipe stable support; the side wall of the steel arch is provided with double-layer grouting holes, and the double-layer grouting holes are penetrated by a grouting conduit; the bottom of the grouting pipe stable support is provided with a bearing plate, the top of the bearing plate is connected with an adjusting rod, the top end of the adjusting rod is connected with a bottom plate, the two sides of the bottom plate are provided with expansion tracks, the expansion tracks are provided with guiding sliding grooves in the middle, adjusting blocks are slidingly connected in the guiding sliding grooves, the top of each adjusting block is connected with an inclined plate, the two ends of the inclined plate are fixed with positioning frames, lower arc-shaped limiting plates are welded on the two sides of the top end of each positioning frame, and upper arc-shaped limiting plates are arranged above the lower arc-shaped limiting plates; the upper arc-shaped limiting plates and the lower arc-shaped limiting plates are provided with reserved through holes, and the reserved through holes are penetrated by the grouting conduit.

3. The combined pre-reinforcement system for the shallow-buried tunnel across the gully of the gravel soil according to claim 2, characterized in that, The bearing plate is flush with the bottom end of the steel arch; the two ends of the bearing plate are provided with pull rods and are connected with U-shaped fixed grooves, the steel arch is fixedly penetrated in the U-shaped fixed grooves; the grouting conduit is staggered arranged in two layers; the top of the positioning frame is connected with an expansion rod, and the top of the expansion rod is fixed with the upper arc-shaped limiting plate.

4. The combined pre-reinforcement system for the shallow-buried tunnel across the gully of the gravel soil according to claim 1, characterized in that, The steel arch comprises steel arch segments; the steel arch segments are assembled into a steel arch, and each group of steel arch segments is welded with butt plates on the side edges; the side walls between a pair of steel arch segments are connected with ribbed plates and are fixed on the butt plates, the top and the bottom of each ribbed plate are symmetrically provided with tightening devices, and the tightening device comprises a sliding rail and a bolt; the sliding rail is welded on the edge of the side wall of the steel arch segment, a sliding block is slidingly connected in the sliding rail, the sliding block is provided with an expansion inclined rod, the other end of the expansion inclined rod is fixed with a tightening end plate, and the tightening end plate is fixed on the ribbed plate through the bolt.

5. The combined pre-reinforcement system for the shallow-buried tunnel across the gully of the gravel soil according to claim 4, characterized in that, A bearing plate is welded on the bottom of the steel arch segment, a threaded sleeve is arranged on the top of the bearing plate, and the threaded sleeve is fixed with an elastic anchor rod; the ribbed plate is provided with a reserved through hole, and the reserved through hole is penetrated by the elastic anchor rod.

6. The combined pre-reinforcement system for the shallow-buried tunnel across the gully of the gravel soil according to claim 1, characterized in that, A temporary foundation is arranged at the bottom of the tunnel, and a temporary road is arranged on the top of the temporary foundation; a ground pump is arranged on the top of the temporary road, horizontal conduits are connected to the two sides of the ground pump, and the other ends of the horizontal conduits are connected with vertical conduits; the horizontal conduits are provided with horizontal fixing supports, and the vertical conduits are provided with a vertical fixing system; the vertical fixing system comprises a cable; a hoop is arranged on the vertical conduit, the hoop is connected with a lifting ring, a lifting ring is arranged on the top of the ground pump, and the two ends of the cable are provided with connecting buckles and are connected with the lifting ring on the top of the vertical conduit and the ground pump, respectively.

7. The combined pre-reinforcement system for the shallow-buried tunnel across the gully of the gravel soil according to claim 6, characterized in that, The transverse fixing support comprises a supporting plate; the supporting plate is supported at the bottom of the transverse pipe, the bottom of the supporting plate is connected with a support frame, the support frame is sleeved with a hoop, the hoop is connected with a lifting ring, and the support frame is connected with a sliding base plate; the bottom of the sliding base plate is provided with sliding rails; the adjacent support frames are connected with telescopic rods, the ends of the telescopic rods are provided with springs and fixedly connected with buckles, and the buckles are connected with the lifting rings.

8. The combined pre-reinforcement system for the shallow-buried tunnel across the gully of the gravel soil according to claim 1, characterized in that, The gully tunnel section is provided with a prefabricated waterproof plate and a reserved post-cast strip hanging formwork system; vertical rods are arranged at four corners of the reserved post-cast strip hanging formwork system; the bottom of the vertical rod is provided with a pyramid, and the pyramid is inserted into the soil; the reserved post-cast strip hanging formwork system comprises a left post-cast strip hanging form and a right post-cast strip hanging form which are symmetrical to each other; top supports are arranged at the top of the reserved post-cast strip hanging formwork system; sliding rods are arranged between the top supports, and the sliding rods are sleeved with sliding sleeves; the bottom of the sliding sleeve is connected with a fixed rod, and the other end of the fixed rod is fixedly connected with the left post-cast strip hanging form and the right post-cast strip hanging form; connecting rods are arranged between adjacent sliding sleeves; push rods are arranged between the connecting rods and the top supports; the post-cast strip hanging form is provided with a left telescopic form and a right telescopic form, and upper short plates and lower short plates are arranged on the side walls of the telescopic forms; jacks are arranged between the two short plates.

9. The combined pre-reinforcement system for the shallow-buried tunnel across the gully of the gravel soil according to claim 8, characterized in that, A plurality of limiting blocks are uniformly arranged at the bottom of the left telescopic form and the right telescopic form, and a special-shaped limiting block is fixed on the top of the prefabricated waterproof plate through bolts; a limiting groove is arranged at the top of the special-shaped limiting block, and the limiting blocks are arranged in the limiting groove; and a butt joint hole and a butt joint block are arranged on the side walls of the left post-cast strip hanging form and the right post-cast strip hanging form respectively, and the butt joint hole and the butt joint block are matched in shape.

10. The construction method of combined pre-reinforcement of shallow-buried tunnel crossing gully of gravel soil according to claim 1, characterized in that, The method comprises the following steps: Step one, a water retaining dam is built on the upstream of the gully to connect the original gully water flow to the permanent gully; Step two, a fixed rib plate connected steel arch support is installed; Step three, the grouting pipe is penetrated through the steel arch support and the top of the grouting pipe stable support, and grout is injected to realize double-layer small pipe support; Step four, the double-layer small pipe support is used to transport concrete from the tunnel to the outside of the tunnel by using a ground pump after passing through the gully, and the ground surface is backfilled and poured to reinforce the work; Step five, the reserved post-cast strip hanging formwork system is hung to the telescopic form at the required position, and the telescopic form is assembled to complete the prefabricated waterproof plate-reinforced concrete gully anti-seepage construction.

Images