Combined waterproofing method for large-section reinforced concrete pipe gallery

Abstract

The present application relates to a kind of large-section reinforced concrete pipe gallery combination waterproof method, and the interface part of pipe gallery floor and pipe gallery side wall is provided with built-in deflection cutoff and oblique reinforcing bar;Corner reinforcing plate, first waterproof body and third waterproof body are set outside pipe gallery floor and pipe gallery side wall;Second waterproof body, first water stop and second water stop are sequentially set from below to above in the lower part of floor joint of pipe gallery floor, and water-swelling body and anti-cracking tendon are set in floor joint;Loose catchment and horizontal drain pipe are set in the joint of second water stop and first water stop;Second control bolt and first control bolt are respectively set on pipe gallery inner form and pipe gallery outer form, and pipe gallery concrete near water stop plate is pre-cast;After drain pipe and inner corner reinforcing plate are set in the inner wall of the corner of pipe gallery floor and pipe gallery side wall.The present application can effectively improve the waterproof performance of pipe gallery, and enhance the overall structure.

Description

Technical Field

[0001] This invention belongs to the field of reinforced concrete pipe gallery waterproofing engineering, and particularly relates to a combined waterproofing method for large-section reinforced concrete pipe galleries. Background Technology

[0002] Reinforced concrete utility tunnels are widely used in urban drainage and pipeline projects. During on-site construction, improving the airtightness and waterproofing of the tunnel structure, reducing the difficulty of formwork erection, and enhancing the load-bearing capacity of the tunnel structure have always been key and challenging aspects of on-site project control.

[0003] In existing construction techniques, there is a structure for constructing expansion joints in the roof slab of underground cast-in-place concrete pipe gallery. This involves setting up a ring-shaped steel reinforcement frame on the reinforcing steel skeleton of the concrete roof slab on both sides of the pre-set expansion joint. A slot for attaching embedded rubber waterstop wing plates is installed on the ring-shaped steel reinforcement frame. Foamed boards are placed above and below the rubber waterstop. Concrete positioning blocks are placed between the ring-shaped steel reinforcement frame and the foamed boards on both sides. Pre-reserved positioning sand boxes filled with sealant are placed on the upper and lower surfaces of the expansion joint. Concrete positioning blocks are also placed between the pre-reserved positioning sand boxes and the ring-shaped steel reinforcement frame on both sides. While this structure improves the forming quality and waterproofing capacity of the expansion joint and solves the problem of how to stably position the waterstop and foamed boards in the expansion joint, this technology fails to solve technical challenges such as accurate positioning of the waterstop and the combined improvement of seepage prevention performance at pipe gallery corners and construction joints.

[0004] Therefore, in order to improve the waterproof performance of cast-in-place reinforced concrete pipe corridors, there is an urgent need to invent a combined waterproofing method for large-section reinforced concrete pipe corridors that can improve the positioning accuracy of waterstop strips, enhance the waterproof performance of cast-in-place pipe corridors, and reduce the difficulty of on-site quality control. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a combined waterproofing method for large-section reinforced concrete pipe corridors.

[0006] This method for waterproofing large-section reinforced concrete pipe racks includes the following construction steps:

[0007] Step 1: Pre-installation of waterproof structure at the junction of the pipe gallery floor slab and the pipe gallery side wall: Tie the pipe gallery reinforcement cage; install a deflecting water-cutting plate at the corner where the pipe gallery floor slab and the pipe gallery side wall meet, away from the pipe gallery cavity.

[0008] Step 2: Setting up the waterproof structure under the bottom slab joint: According to the location of the bottom slab joint, excavate a trench in the foundation soil and fill it with the second waterproof structure. Then, lay the first waterproof board, the loose water collection body and the second waterproof board in sequence on the second waterproof structure.

[0009] Step 3: Erection of the outer and inner formwork of the pipe gallery: An inner support box is set inside the inner formwork of the pipe gallery, and a water-stop strip is set on the outer perimeter. An external formwork frame is set on the foundation soil outside the water-stop strip, and the outer formwork of the pipe gallery is arranged between the external formwork frame and the water-stop strip.

[0010] Step 4: Sectional concrete pouring of the pipe gallery: Insert side formwork between the slabs on both sides of the waterstop strip; install a drainage pipe at the junction of the pipe gallery side wall and the pipe gallery bottom slab, and pour the pipe gallery concrete in sections.

[0011] Step 5: Waterproofing of the external structure of the utility tunnel: Install an inner corner reinforcement plate on the inside of the junction between the base slab and the side wall of the utility tunnel, and fill and seal the drainage pipe.

[0012] Preferably, in step one, the deflecting water-cutting plate is zigzag-shaped, with its two side plates flush with the lower surface of the pipe gallery floor slab and the outer wall of the pipe gallery sidewall, respectively, so that the angle between the water-cutting inclined plate in the middle of the deflecting water-cutting plate and the horizontal plane is 45°; a corner reinforcing plate is set on the side of the deflecting water-cutting plate away from the pipe gallery cavity, and a first waterproof body is filled between the corner reinforcing plate and the lower foundation soil; oblique reinforcing bars are spaced longitudinally along the pipe gallery sidewall on the side of the deflecting water-cutting plate close to the pipe gallery cavity, and the cross-section of the oblique reinforcing bars is U-shaped; and the top plate of the reinforcing bars is parallel to the water-cutting inclined plate; the oblique reinforcing bars include a reinforcing bar top plate and a reinforcing bar support plate, and the reinforcing bar top plate and the reinforcing bar support plate are welded vertically together; the deflecting water-cutting plate is arranged longitudinally along the pipe gallery sidewall.

[0013] Preferably, in step two, a first waterproofing plate is laid on the upper surface of the second waterproofing body. First, a loose water collection body is set at the position corresponding to the joint between the upper surface of the first waterproofing plate and the bottom plate. Then, a reinforcing connecting strip is set on each side of the loose water collection body. Next, a second waterproofing plate is laid along the upper surface of the first waterproofing plate, the reinforcing connecting strip, and the loose water collection body. Horizontal drainage pipes connected to external pumping equipment are set at both ends of the loose water collection body. Anti-crack reinforcement bars are set between the two mirror-facing bottom support piers. The reinforcing connecting strip is made of water-swellable rubber waterstop. The loose water collection body is made of uniformly sized medium-coarse sand or large-pore drainage concrete. The cross-section of the bottom support pier is a right-angled trapezoid, with its top 10-20 cm higher than the upper surface of the second waterproofing body.

[0014] Preferably, in step three, the outer formwork of the pipe gallery includes an outer mold and an outer top mold, with a first wedge plate on both sides of the outer mold and a second wedge plate on both sides of the outer top mold. An external grouting pipe is installed on the outer top mold. The inner formwork of the pipe gallery includes an inner bottom mold, an inner top mold, and an inner side mold, with a third wedge plate on both sides of the inner bottom mold and the inner top mold, and a fourth wedge plate on both sides of the inner side mold. The angle between the contact surface of the third and fourth wedge plates and the horizontal plane is 15-30°. An internal grouting pipe is installed on the inner bottom mold.

[0015] Preferably, an internal support box is installed inside the section of the pipe gallery to be poured, and an internal support positioning bolt is vertically welded to the side of the internal support box facing the inner formwork of the pipe gallery. A bolt end support plate parallel to the direction of the inner formwork of the pipe gallery is welded to the internal support positioning bolt. One end of the internal support box is inserted into the already poured section of the pipe gallery and vertically welded to the internal support frame, and the other end is vertically welded to the external support frame. A circumferentially closed waterstop strip is installed around the inner formwork of the pipe gallery at the construction joint of the cast-in-place pipe gallery, and the inner position of the waterstop strip is controlled by a second control bolt. An external formwork frame is installed on the foundation soil outside the waterstop strip, and the outer formwork of the pipe gallery is arranged between the external formwork frame and the waterstop strip. A bottom inclined pier is installed on the foundation soil. The positions of the outer formwork and the outer top formwork are controlled by the horizontal positioning body and the vertical positioning body, and the outer position of the waterstop strip is controlled by the first control bolt.

[0016] Preferably, the inner support frame in step three includes a lower inner support column and an upper inner support column; the top of the lower inner support column is vertically welded to the inner support box, and the bottom is vertically welded to the inner support base plate; the bottom of the upper inner support column is vertically welded to the inner support box, and the top is supported on the lower surface of the top plate of the already poured section of the pipe gallery; the outer support frame includes a lower outer support column and an upper outer support column, with an outer support top plate between the lower and upper outer support columns, and an outer support base plate at the bottom of the lower outer support column; the inner support positioning bolt includes a screw and a nut, with the screws on both sides of the nut tightening in opposite directions; the position of the inner formwork of the pipe gallery is defined by the template positioning bolt, and screw holes matching the second control bolt and the template positioning bolt are pre-set on the bolt end support plate; the two sides of the waterstop strip are respectively provided with connecting bolt grooves for connecting to the first control bolt and the second control bolt; the template outer frame includes an outer frame beam and an outer frame column, with a horizontal positioning body and a vertical positioning body respectively provided on the upper side of the outer frame column and the outer frame beam facing the outer formwork of the pipe gallery.

[0017] As a preferred embodiment, in step four, control slots that can be inserted from the outside to the inside are respectively set on the outer and inner side molds on both sides of the waterstop strip. First, the position of the control slots is adjusted by the slot control bolts, and then the inter-slab side mold is inserted between the two mirror-opposite control slots. First, the drainage pipe is installed at the junction of the pipe gallery side wall and the pipe gallery bottom plate, and then the pipe gallery concrete pouring construction in the waterstop strip area is carried out. Then, the inter-slab side mold is removed, and then the pipe gallery concrete pouring in other areas is carried out. Several water-swellable bodies are set along the longitudinal direction of the pipe gallery bottom plate at the bottom plate joint.

[0018] Preferably, in step four, the rear drainage pipe is welded to the adjacent pipe rack reinforcement cage, and the pipe opening of the rear drainage pipe is flush with the upper surface of the pipe rack bottom plate or the inner surface of the pipe rack side wall; the cross section of the control groove plate is π-shaped and is connected to the groove plate control bolt through a screw hole.

[0019] As a preferred embodiment, in step five, a third waterproof body is installed on the outside of the corner reinforcement plate on the outside of the side wall of the pipe gallery; an inner corner reinforcement plate is installed on the inner wall of the pipe gallery cavity at the junction of the bottom plate of the pipe gallery and the side wall of the pipe gallery, and the inner corner reinforcement plate is welded to the rear drainage pipe, the inner corner reinforcement plate being L-shaped; a water collection filler is filled inside the rear drainage pipe, and a sealing plug is installed at the pipe opening of the rear drainage pipe.

[0020] Preferably, in step five, the water collection filler is made of medium-coarse sand or permeable concrete with uniform particle size; the sealing plug is made of rubber; and holes for the subsequent drainage pipe to pass through are pre-set on the inner corner reinforcing plate.

[0021] The beneficial effects of this invention are:

[0022] 1) A zigzag-shaped turning water-cutting plate is installed at the junction of the pipe gallery floor slab and the management side wall, and diagonal reinforcing bars parallel to the turning water-cutting plate are installed to improve the connection strength between the pipe gallery floor slab and the pipe gallery side wall; at the same time, corner reinforcing plates, first waterproof body and third waterproof body are installed on the outside of the pipe gallery floor slab and the pipe gallery side wall to enhance the waterproof performance of the pipe gallery corner.

[0023] 2) A second waterproof body, a first water-proof board, and a second water-proof board are installed sequentially from bottom to top at the bottom of the base plate joint of the pipe gallery base plate, which enhances the seepage prevention performance of the bottom of the base plate joint; a water-swellable body and a crack-resistant tie are installed at the base plate joint, and the second waterproof body is subjected to lateral tension through the crack-resistant tie, which enhances the seepage prevention performance of the pipe gallery base plate at the base plate joint.

[0024] 3) Loose water collection bodies and horizontal drainage pipes are installed at the joint between the second and first water-proof boards to quickly remove seepage from the bottom of the base plate joint and to supplement the removal of seepage.

[0025] 4) A second control bolt and a first control bolt are respectively installed on the inner and outer molds of the pipe gallery to control the position of the waterstop strip from the inside and outside. At the same time, during the concrete pouring construction of the pipe gallery, side molds between the plates are set on both sides of the waterstop strip to pre-pour the pipe gallery concrete near the waterstop strip, thus avoiding the impact of the pipe gallery concrete pouring on the waterstop strip.

[0026] 5) A rear drainage pipe and inner corner reinforcement are installed on the inner side wall at the corner of the pipe gallery floor slab and the pipe gallery side wall. A water collection filler is installed in the rear drainage pipe to quickly drain the seepage water in the pipe gallery floor slab and the pipe gallery side wall. Attached Figure Description

[0027] Figure 1 This is a flowchart of the construction process for combined waterproofing of large-section reinforced concrete pipe gallery;

[0028] Figure 2 This is a structural diagram of the waterproofing at the joints of the base plate;

[0029] Figure 3 This is a diagram of the waterproofing structure at the junction of the pipe gallery floor slab and the pipe gallery side wall;

[0030] Figure 4 This is a schematic diagram of the waterstop strip fixing structure;

[0031] Figure 5 This is a schematic diagram of the formwork support structure inside the pipe gallery;

[0032] Figure 6 This is a schematic diagram of the concrete pouring structure of the pipe gallery in the waterstop area.

[0033] In the diagram: 1-Pipe gallery bottom slab; 2-Pipe gallery side wall; 3-Pipe gallery reinforcement cage; 4-Turn water-cutting slab; 5-Water-cutting inclined slab; 6-Corner reinforcement slab; 7-Foundation soil; 8-First waterproofing layer; 9-Diagonal reinforcement bar; 10-Reinforcement bar top slab; 11-Reinforcement bar support plate; 12-Bottom slab joint; 13-Second waterproofing layer; 14-Bottom slab support pier; 15-Crack-resistant tie bar; 16-First waterproofing plate; 17-Loose catchment area; 18-Reinforcing connecting strip; 19-Second water-proof plate; 20-Horizontal drainage pipe; 21-Outer mold; 22-Outer top mold; 23-First wedge plate; 24-Second wedge plate; 25-Outer grouting pipe; 26-Inner bottom mold; 27-Inner top mold; 28-Inner side mold; 29-Third wedge plate; 30-Fourth wedge plate; 31-Inner grouting pipe; 32-Inner support box; 33-Inner 34-Positioning bolt; 35-Poured section of pipe gallery; 36-Internal support frame; 37-External support frame; 38-Waterstop strip; 39-Second control bolt; 40-External formwork scaffold; 41-Bottom inclined pier; 42-Horizontal positioning body; 43-Vertical positioning body; 44-Bottom corner brace; 45-Upper column of internal scaffold; 46-Lower column of internal scaffold; 47-Bottom plate of internal scaffold; 48-Lower column of external scaffold; 49 - Scaffolding upper column; 50 - Formwork positioning bolt; 51 - Connecting bolt groove; 52 - Control groove plate; 53 - Groove plate control bolt; 54 - Side formwork between slabs; 55 - Rear drainage pipe; 56 - Pipe gallery concrete; 57 - Inner corner reinforcing plate; 58 - Water-swellable body; 59 - Water collection filler; 60 - Pipe plug; 61 - Scaffolding crossbeam; 62 - Scaffolding column; 63 - Scaffolding top plate; 64 - Scaffolding bottom plate. Detailed Implementation

[0034] The present invention will be further described below with reference to embodiments. The description of the embodiments below is only for the purpose of helping to understand the present invention. It should be noted that those skilled in the art can make several modifications to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0035] Example 1

[0036] As one example, such as Figure 1As shown, a combined waterproofing method for large-section reinforced concrete pipe racks includes the following construction steps:

[0037] Step 1: Pre-planning of the waterproof structure at the junction of the pipe gallery floor slab 1 and the pipe gallery side wall 2: Tie the pipe gallery reinforcement cage 3 according to design requirements; at the corner where the pipe gallery floor slab 1 and the pipe gallery side wall 2 meet, a zigzag-shaped turning water-cutting plate 4 is set away from the pipe gallery cavity, with both sides of the turning water-cutting plate 4 flush with the lower surface of the pipe gallery floor slab 1 and the outer side wall of the pipe gallery side wall 2 respectively, and the water-cutting inclined plate 5 in the middle of the turning water-cutting plate 4 forming an angle of 45° with the horizontal plane; a corner reinforcement plate 6 is set away from the pipe gallery cavity on the turning water-cutting plate 4, and a first waterproof body 8 is filled between the corner reinforcement plate 6 and the lower foundation soil 7; the first waterproof body 8 uses 3-5% cement and 0.5-3% octadecylamine-stabilized fine-grained soil; on the side of the turning water-cutting plate 4 near the pipe gallery cavity, diagonal reinforcement bars 9 with a U-shaped cross section are evenly spaced along the longitudinal direction of the pipe gallery side wall 2, and the top plate 10 of the reinforcement bars is parallel to the water-cutting inclined plate 5.

[0038] Step 2: Setting up the waterproof structure below the bottom slab joint: Based on the location of the bottom slab joint 12 determined by surveying, a trench is excavated in the foundation soil 7 parallel to the bottom slab joint 12 and filled with the second waterproof structure 13. Mirror-image bottom supports 14 are evenly spaced along the longitudinal direction of the second waterproof structure 13, and anti-crack reinforcement 15 is installed between the two mirror-image bottom supports 14. The second waterproof structure 13 is made of 3-5% cement and 0.5-3% octadecylamine-stabilized fine-grained soil. A first waterproof board 16 is laid on the upper surface of the second waterproof structure 13. First, a loose water collection body 17 is set on the upper surface of the first waterproof board 16 at a position corresponding to the bottom slab joint 12. Then, a reinforcing connecting strip 18 is set on both sides of the loose water collection body 17. Then, a second waterproof board 19 is laid along the upper surface of the first waterproof board 16, the reinforcing connecting strip 18, and the loose water collection body 17. Horizontal drainage pipes 20 connected to external pumping equipment are installed at both ends of the loose water collection body 17.

[0039] Step 3: Erection of the outer and inner formwork of the pipe gallery: The outer formwork of the pipe gallery includes an outer mold 21 and an outer top mold 22. A first wedge plate 23 is installed on both sides of the outer mold 21, and a second wedge plate 24 is installed on both sides of the outer top mold 22. An external grouting pipe 25 is installed on the outer top mold 22. The inner formwork of the pipe gallery includes an inner bottom mold 26, an inner top mold 27, and an inner side mold 28. A third wedge plate 29 is installed on both sides of the inner bottom mold 26 and the inner top mold 27, and a fourth wedge plate 30 is installed on both sides of the inner side mold 28. An internal grouting pipe 31 is installed on the inner bottom mold 26. An inner support box 32 is installed inside the section of the pipe gallery to be poured. An inner support positioning bolt 33 is vertically welded to the inner support box 32 facing the inner formwork of the pipe gallery. Bolts parallel to the direction of the corresponding inner formwork of the pipe gallery are welded to the inner support positioning bolts 33. End support plate 34; one end of the inner support box 32 is inserted into the cast-in-place section 35 of the pipe gallery and vertically welded to the inner support frame 36, and the other end is vertically welded to the outer support frame 37; a circumferentially closed waterstop strip 38 is set on the outer periphery of the inner formwork of the pipe gallery at the construction joint of the cast-in-place pipe gallery, and the inner position of the waterstop strip 38 is controlled by the second control bolt 39; a template frame 40 is set on the foundation soil 7 outside the waterstop strip 38, and the outer formwork of the pipe gallery is arranged between the template frame 40 and the waterstop strip 38; a bottom inclined pier 41 with a cross section of right-angled trapezoid is set on the foundation soil 7; the position of the outer formwork 21 and the outer top formwork 22 is first controlled by the horizontal positioning body 42 and the vertical positioning body 43, and then the outer position of the waterstop strip 38 is controlled by the first control bolt 44;

[0040] Step 4, Sectional Concrete Pouring of the Pipe Gallery: Control slot plates 52, which can be inserted from the outside to the inside, are respectively installed on the outer mold 21 and inner mold 28 on both sides of the waterstop strip 38. First, the position of the control slot plates 52 is adjusted using the slot plate control bolts 53. Then, inter-slab side molds 54 are inserted between the two mirror-image control slot plates 52. First, drainage pipes 55 are installed at the junction of the pipe gallery side wall 2 and the pipe gallery bottom plate 1. Then, the pipe gallery concrete 56 in the area of ​​the waterstop strip 38 is poured. Then, the inter-slab side molds 54 are removed, and subsequently, the pipe gallery concrete 56 in other areas is poured. Two to three water-swellable bodies 58 are installed longitudinally along the pipe gallery bottom plate 12 at the bottom plate joint 12.

[0041] Step 5: Layout of external waterproofing body for the utility tunnel: A third waterproofing body 56 is installed on the outside of the corner reinforcement plate 6 on the outside of the side wall 2 of the utility tunnel; the third waterproofing body 56 is made of fine-grained soil stabilized with 3-5% cement and 0.5-3% octadecylamine; an L-shaped inner corner reinforcement plate 57 is installed on the inner wall of the utility tunnel cavity at the junction of the bottom plate 1 and the side wall 2 of the utility tunnel, and the inner corner reinforcement plate 57 is welded to the rear drainage pipe 55; the rear drainage pipe 55 is filled with a water collection filler 59, and a sealing plug 60 is installed at the opening of the rear drainage pipe 55.

[0042] Example 2

[0043] Based on Example 1, this example proposes a more specific method for combined waterproofing of large-section reinforced concrete pipe corridors.

[0044] Built-in turning water-cutting plate 4 and diagonal reinforcing bar 9 are installed at the junction of the pipe gallery bottom plate 1 and the pipe gallery side wall 2; corner reinforcing plate 6, first waterproof body 8 and third waterproof body 56 are installed on the outer side of the pipe gallery bottom plate 1 and the pipe gallery side wall 2; second waterproof body 13, first water-proof plate 16 and second water-proof plate 19 are installed sequentially from bottom to top at the bottom plate joint 12 of the pipe gallery bottom plate 1, and bottom support pier 14 and crack-preventing tie bar 15 are installed at the bottom plate joint 12; loose water collection body 17 and transverse drainage pipe 20 are installed at the joint between the second water-proof plate 19 and the first water-proof plate 16; second control bolt 39 and first control bolt 44 are installed on the inner formwork and outer formwork of the pipe gallery respectively, and pipe gallery concrete 56 near the water-stop plate strip 38 is pre-poured; rear drainage pipe 55 and inner corner reinforcing plate 57 are installed on the inner side wall at the corner of the pipe gallery bottom plate 1 and the pipe gallery side wall 2.

[0045] Both the bottom slab 1 and the side wall 2 of the utility tunnel are made of reinforced concrete with a thickness of 30cm. The strength grade of the concrete 56 in the utility tunnel is C35.

[0046] The pipe rack reinforcement cage 3 includes longitudinal and transverse steel bars with a diameter of 25mm; at the corner where the pipe rack bottom plate 1 connects to the pipe rack side wall 2, a zigzag-shaped turning water-cutting plate 4 is set away from the pipe rack cavity. The turning water-cutting plate 4 is made of steel plate with a thickness of 2mm. The water-cutting inclined plate 5 in the middle of the turning water-cutting plate 4 is 50cm long and has an angle of 45° with the horizontal plane.

[0047] A corner reinforcement plate 6 is installed on the side of the turning water cut-off plate 4 away from the pipe gallery cavity. The corner reinforcement plate 6 is made of steel plate with a thickness of 1mm and a length of 2m. It is connected to the bottom plate 1 of the pipe gallery and the side wall 2 of the pipe gallery by studs.

[0048] The foundation soil 7 is dense sand.

[0049] The first waterproofing body 8, the second waterproofing body 13, and the third waterproofing body 56 all use fine-grained soil stabilized with 3% cement and 1% octadecylamine.

[0050] Along the side wall 2 of the pipe gallery, diagonal reinforcing bars 9 with U-shaped cross sections are evenly spaced at intervals in the longitudinal direction of the turning water cut-off plate 4. The diagonal reinforcing bars 9 include one reinforcing bar top plate 10 and two reinforcing bar support plates 11, each with a width of 5cm and a length of 15cm.

[0051] A bottom plate joint 12 is provided every 20m between the bottom plate 1 and the side wall 2 of the utility tunnel.

[0052] Mirror-image bottom support piers 14 are evenly spaced along the longitudinal direction of the second waterproof body 13. The bottom support piers 14 are made of steel plates with a thickness of 10mm and a height of 20cm. Anti-crack tie rods 15 are set between the two mirror-image bottom support piers 14. The anti-crack tie rods 15 are made of screws with a diameter of 20mm.

[0053] A first waterproofing plate 16 is laid on the upper surface of the second waterproof body 13. The first waterproofing plate 16 is made of stainless steel plate with a thickness of 1mm.

[0054] First, a loose water collection body 17 is set on the upper surface of the first water-proof plate 16 at a position corresponding to the joint 12 of the bottom plate. The loose water collection body 17 is made of medium-coarse sand. A reinforcing connecting strip 18 is set on both sides of the loose water collection body 17. The reinforcing connecting strip 18 is made of waterproof concrete.

[0055] A second water-proof plate 19 is laid along the upper surface of the first water-proof plate 16, the reinforcing connecting strip 18 and the loose water collection body 17. The second water-proof plate 19 is made of a rubber sheet with a thickness of 1 mm.

[0056] At both ends of the loose water catchment body 17, horizontal drainage pipes 20 are installed to connect with external pumping equipment. The horizontal drainage pipes 20 are made of PVC pipes with a diameter of 6cm.

[0057] The outer mold of the utility tunnel includes an outer mold 21 and an outer top mold 22, and the inner mold of the utility tunnel includes an inner bottom mold 26, an inner top mold 27 and an inner side mold 28, all of which are made of aluminum plates with a thickness of 5mm.

[0058] First wedge plates 23 are provided on both sides of the outer mold 21, and second wedge plates 24 are provided on both sides of the outer top mold 22. The contact surfaces of the first wedge plates 23 and the second wedge plates 24 form an angle of 15° with the horizontal plane, and their cross-sections are both right-angled trapezoids with a height of 10cm. Third wedge plates 29 are provided on both sides of the inner bottom mold 26 and the inner top mold 27, and fourth wedge plates 30 are provided on both sides of the inner side mold 28. The contact surfaces of the third wedge plates 29 and the fourth wedge plates 30 form an angle of 15° with the horizontal plane, and their cross-sections are both right-angled trapezoids with heights of 30cm and 10cm, respectively.

[0059] An external grouting pipe 25 with a diameter of 30cm is installed on the outer top mold 22; an internal grouting pipe 31 with a diameter of 30cm is installed on the inner bottom mold 26.

[0060] An internal support box 32 is installed inside the section of the pipe gallery awaiting pouring. The internal support box 32 is made of 2mm thick rolled steel plate, with a width of 50cm and a height of 30cm. Internal support positioning bolts 33 are vertically welded to the side of the internal support box 32 facing the inner formwork of the pipe gallery. The internal support positioning bolts 33 are made of 6cm diameter threaded rods and nuts. Bolt end support plates 34, parallel to the direction of the corresponding inner formwork of the pipe gallery, are welded to the internal support positioning bolts 33. The bolt end support plates 34 are made of 10mm thick rolled steel plate. Threaded holes matching the template positioning bolts 50 are pre-set on the bolt end support plates 34. The template positioning bolts 50 are made of 20mm diameter threaded rods.

[0061] One end of the inner support box 32 is inserted into the cast-in-place section 35 of the pipe gallery and welded vertically to the inner support frame 36, and the other end is welded vertically to the outer support frame 37. The inner support frame 36 includes 4 lower inner support columns 46 and 2 upper inner support columns 45. Both the lower inner support columns 46 and the upper inner support columns 45 are composed of bolts and nuts with a diameter of 100mm. The top of the lower inner support column 46 is welded vertically to the inner support box 32, and the bottom is welded vertically to the inner support base plate 47. The inner support base plate 47 is made of steel plate with a thickness of 2mm.

[0062] The external support frame 37 includes four lower external support columns 48 and two upper external support columns 49. The lower external support columns 48 are rolled from steel pipes with a diameter of 150mm, and the upper external support columns 49 are composed of bolts and nuts with a diameter of 100mm. An external support top plate 63 is set between the lower external support columns 48 and the upper external support columns 49, and an external support bottom plate 64 is set at the bottom of the lower external support columns 48. The external support top plate 63 is rolled from 10mm steel plate, and the external support bottom plate 64 is rolled from 2mm thick steel plate.

[0063] A circumferentially closed waterstop strip 38 is installed around the outer periphery of the inner formwork at the joint of the cast-in-place pipe gallery construction. The waterstop strip 38 is made of steel plate and has a width of 30cm. Connecting bolt grooves 51 are respectively provided on both sides of the waterstop strip 38 to connect with the first control bolt 44 and the second control bolt 39. The connecting bolt grooves 51 are nuts that match the first control bolt 44 and the second control bolt 39.

[0064] The inner position of the waterstop strip 38 is controlled by the second control bolt 39. Both the second control bolt 39 and the first control bolt 44 are made of screws with a diameter of 20mm.

[0065] A formwork scaffold 40 is installed on the foundation soil 7 outside the waterstop strip 38. The formwork scaffold 40 includes a crossbeam 61 and a column 62, both of which are made of H-beams with a specification of 250×250×9×14. A horizontal positioning body 42 and a vertical positioning body 43 are respectively installed on the column 61 and the crossbeam 62 facing the outer formwork of the pipe gallery. Both the horizontal positioning body 42 and the vertical positioning body 43 are hydraulic jacks.

[0066] A bottom inclined pier 41 with a right-angled trapezoidal cross section is set on the foundation soil 7. The bottom inclined pier 41 is made of steel plate with a thickness of 2mm and has a right-angled trapezoidal cross section with an angle of 15° between the hypotenuse and the horizontal plane.

[0067] On the outer mold 21 and inner mold 28 on both sides of the waterstop strip 38, there are control slot plates 52 that can be inserted from the outside to the inside. The control slot plates 52 are made of rolled steel plates with a width of 5cm and a cross section of π. They are connected to the slot plate control bolts 53 through screw holes.

[0068] First, adjust the position of the control slot plate 52 by using the slot plate control bolt 53. Then, insert the inter-plate side mold 54 between the two mirror-opposite control slot plates 52. The inter-plate side mold 54 is made of aluminum plate with a thickness of 4mm.

[0069] First, a rear drainage pipe 55 is installed at the junction of the side wall 2 and the bottom plate 1 of the pipe gallery. The rear drainage pipe 55 is made of steel pipe with a diameter of 100mm. The interior of the rear drainage pipe 55 is filled with a water collection filler 59, which is made of permeable concrete. A sealing plug 60 is installed at the opening of the rear drainage pipe 55. The sealing plug 60 is a frustum-shaped rubber plug.

[0070] Two water-swellable bodies 58 with a width of 10cm are installed longitudinally along the bottom plate 12 at the bottom plate joint 12.

[0071] An L-shaped inner corner reinforcing plate 57 is installed on the inner wall of the pipe gallery cavity at the junction of the pipe gallery bottom plate 1 and the pipe gallery side wall 2. The inner corner reinforcing plate 57 is made of stainless steel plate with a thickness of 2mm.

[0072] It should be noted that the parts in this embodiment that are the same as or similar to those in Embodiment 1 can be referred to each other, and will not be repeated in this application.

[0073] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from the others. The same or similar parts between the various embodiments can be referred to each other.

Claims

1. A combined waterproofing method for large-section reinforced concrete pipe gallery, characterized in that, The construction steps include the following: Step 1: Pre-set waterproof structure at the junction of the pipe gallery floor slab and the pipe gallery side wall: Tie the pipe gallery steel cage (3); Set a deflecting water-cutting plate (4) at the corner where the pipe gallery floor slab (1) and the pipe gallery side wall (2) meet, away from the pipe gallery cavity. Step 2: Setting up the waterproof structure under the bottom plate joint: According to the location of the bottom plate joint (12), a trench is dug in the foundation soil (7) and filled with the second waterproof body (13). The first waterproof board (16), the loose water collection body (17), and the second waterproof board (19) are laid on the second waterproof body (13) in sequence. Step 3: Erection of the outer and inner formwork of the pipe gallery: An inner support box (32) is set inside the inner formwork of the pipe gallery, and a waterstop strip (38) is set on the outer perimeter. An outer formwork frame (40) is set on the foundation soil (7) outside the waterstop strip (38), and the outer formwork of the pipe gallery is arranged between the outer formwork frame (40) and the waterstop strip (38). The outer formwork of the pipe gallery includes an outer formwork (21) and an outer top formwork (22). A first wedge plate (23) is set on both sides of the outer formwork (21), and a second wedge plate (23) is set on both sides of the outer top formwork (22). Two wedges (24) are provided on the outer top mold (22), and an external grouting pipe (25) is provided on the outer top mold (22). The inner mold of the pipe gallery includes an inner bottom mold (26), an inner top mold (27) and an inner side mold (28). A third wedge (29) is provided on both sides of the inner bottom mold (26) and the inner top mold (27), and a fourth wedge (30) is provided on both sides of the inner side mold (28). The angle between the contact surface of the third wedge (29) and the fourth wedge (30) and the horizontal plane is 15-30°. An internal grouting pipe (31) is provided on the inner bottom mold (26). Step 4, Sectional Concrete Pouring of the Pipe Gallery: Insert side formwork (54) between the waterstop strip (38) on both sides; install a drainage pipe (55) at the junction of the pipe gallery side wall (2) and the pipe gallery bottom plate (1), and pour the pipe gallery concrete in sections (56); set up control slots (52) that can be inserted from the outside to the inside on the outer formwork (21) and inner formwork (28) on both sides of the waterstop strip (38), first adjust the position of the control slots (52) by using the slot control bolts (53), and then... A side formwork (54) is inserted between two mirror-facing control slot plates (52); first, a drainage pipe (55) is installed at the junction of the side wall (2) of the pipe gallery and the bottom plate (1) of the pipe gallery; then, the concrete (56) of the pipe gallery in the area of ​​the waterstop strip (38) is poured; then, the side formwork (54) is removed; and then the concrete (56) of the pipe gallery in other areas is poured; several water-swellable bodies (58) are set longitudinally along the bottom plate (12) of the pipe gallery at the joint (12) of the bottom plate. Step 5: Waterproofing of the pipe gallery exterior: An inner corner reinforcement plate (57) is installed on the inner side of the junction between the pipe gallery floor slab (1) and the pipe gallery side wall (2), and the drainage pipe (55) is filled and sealed.

2. The combined waterproofing method for large-section reinforced concrete pipe gallery according to claim 1, characterized in that: In step one, the turning water-cutting plate (4) is zigzag-shaped. The two side plates of the turning water-cutting plate (4) are flush with the lower surface of the pipe gallery bottom plate (1) and the outer side wall of the pipe gallery side wall (2), respectively, so that the water-cutting inclined plate (5) in the middle of the turning water-cutting plate (4) forms an angle of 45° with the horizontal plane; a corner reinforcement plate (6) is set on the side of the turning water-cutting plate (4) away from the pipe gallery cavity, and the first waterproof body (8) is filled between the corner reinforcement plate (6) and the lower foundation soil (7); (4) Diagonal reinforcing bars (9) are longitudinally spaced along the side wall (2) of the pipe gallery near the cavity of the pipe gallery. The cross section of the diagonal reinforcing bars (9) is U-shaped. The top plate (10) of the reinforcing bars is parallel to the water-cutting inclined plate (5). The diagonal reinforcing bars (9) include the top plate (10) of the reinforcing bars and the support plate (11) of the reinforcing bars. The top plate (10) of the reinforcing bars and the support plate (11) of the reinforcing bars are vertically welded together. The turning water-cutting plate (4) is arranged longitudinally along the side wall (2) of the pipe gallery.

3. The combined waterproofing method for large-section reinforced concrete pipe gallery according to claim 1, characterized in that: In step two, a first waterproofing plate (16) is laid on the upper surface of the second waterproof body (13). First, a loose water collection body (17) is set at the position corresponding to the joint (12) of the bottom plate on the upper surface of the first waterproofing plate (16). Then, a reinforcing connecting strip (18) is set on both sides of the loose water collection body (17). Then, a second waterproofing plate (19) is laid along the upper surface of the first waterproofing plate (16), the reinforcing connecting strip (18) and the loose water collection body (17). (17) is provided with transverse drainage pipes (20) connected to external pumping equipment at both ends; anti-crack tie bars (15) are provided between the two mirror-opposite bottom support piers (14); the reinforcing connection strip (18) is made of water-swellable rubber waterstop; the loose water collection body (17) is made of medium-coarse sand with uniform particle size or large-pore drainage concrete; the cross section of the bottom support pier (14) is a right trapezoid, and the top is 10-20cm higher than the upper surface of the second waterproof body (13).

4. The combined waterproofing method for large-section reinforced concrete pipe gallery according to claim 1, characterized in that: An internal support box (32) is installed inside the section of the pipe gallery to be poured, and an internal support positioning bolt (33) is vertically welded to the side of the internal support box (32) facing the inner formwork of the pipe gallery. A bolt end support plate (34) parallel to the direction of the inner formwork of the pipe gallery is welded to the internal support positioning bolt (33). One end of the internal support box (32) is inserted into the already poured section (35) of the pipe gallery and vertically welded to an internal support frame (36). The other end is vertically welded to an external support frame (37). A circumferentially closed waterstop strip (38) is installed around the inner formwork of the pipe gallery at the construction joint of the cast-in-place pipe gallery. The inner position of the waterstop strip (38) is controlled by the second control bolt (39); a template frame (40) is set on the foundation soil (7) outside the waterstop strip (38), and the pipe gallery outer formwork is arranged between the template frame (40) and the waterstop strip (38), and a bottom inclined pier (41) is set on the foundation soil (7); the positions of the outer formwork (21) and the outer top formwork (22) are controlled by the horizontal positioning body (42) and the vertical positioning body (43), and the outer position of the waterstop strip (38) is controlled by the first control bolt (44).

5. The combined waterproofing method for large-section reinforced concrete pipe gallery according to claim 4, characterized in that: The inner support frame (36) mentioned in step three includes an inner frame lower column (46) and an inner frame upper column (45); the top end of the inner frame lower column (46) is vertically welded to the inner support box (32), and the bottom end is vertically welded to the inner frame bottom plate (47); the bottom end of the inner frame upper column (45) is vertically welded to the inner support box (32), and the top end is supported on the lower surface of the top plate of the already poured section (35) of the pipe gallery; the outer support frame (37) includes an outer frame lower column (48) and an outer frame upper column (49); an outer frame top plate (63) is provided between the outer frame lower column (48) and the outer frame upper column (49); an outer frame bottom plate (64) is provided at the bottom of the outer frame lower column (48); the inner support positioning The bolt (33) includes a screw and a nut, with the screws on both sides of the nut tightening in opposite directions; the position of the inner mold of the pipe gallery is defined by the template positioning bolt (50), and a screw hole matching the second control bolt (39) and the template positioning bolt (50) is pre-set on the bolt end support plate (34); the two sides of the waterstop strip (38) are respectively provided with connecting bolt grooves (51) for connecting the first control bolt (44) and the second control bolt (39); the template outer frame (40) includes an outer frame beam (61) and an outer frame column (62), and the outer frame column (61) and the outer frame beam (62) are respectively provided with a horizontal positioning body (42) and a vertical positioning body (43) on the outer mold side of the pipe gallery.

6. The combined waterproofing method for large-section reinforced concrete pipe gallery according to claim 1, characterized in that: In step four, the rear drainage pipe (55) is welded to the adjacent pipe rack reinforcement cage (3). The pipe opening of the rear drainage pipe (55) is flush with the upper surface of the pipe rack bottom plate (1) or the inner surface of the pipe rack side wall (2). The cross section of the control slot plate (52) is π-shaped and is connected to the slot plate control bolt (53) through a screw hole.

7. The combined waterproofing method for large-section reinforced concrete pipe gallery according to claim 2, characterized in that: In step five, a third waterproof body (56) is installed on the outside of the corner reinforcement plate (6) on the outside of the side wall (2) of the pipe gallery; an inner corner reinforcement plate (57) is installed on the inner wall of the pipe gallery cavity at the junction of the bottom plate (1) and the side wall (2) of the pipe gallery, and the inner corner reinforcement plate (57) is welded to the rear drainage pipe (55), and the inner corner reinforcement plate (57) is L-shaped; a water collection filler (59) is filled inside the rear drainage pipe (55), and a sealing plug (60) is installed at the pipe opening of the rear drainage pipe (55).

8. The combined waterproofing method for large-section reinforced concrete pipe gallery according to claim 7, characterized in that: In step five, the water collection filler (59) is made of medium-coarse sand or permeable concrete with uniform particle size; the sealing plug (60) is made of rubber; and holes for the drainage pipe (55) to pass through are pre-set on the inner corner reinforcing plate (57).

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