Emergency repair method for highway culverts

Abstract

The invention discloses an emergency repair method for a highway culvert, comprising: grouting reinforcement of a small conduit on a highway roadbed, grouting reinforcement of a sleeve valve pipe within the top range of a box culvert, backfilling of an arch culvert and part of a vertical shaft with underwater concrete; constructing anti-sliding piles at the foot of a highway slope, constructing support piles and water-stop curtains for a jacking work pit; constructing a crown beam and a plate support for a jacking work pit, excavating a working pit, casting a slide plate and a back beam, and constructing a ring beam for reinforcing a vertical shaft; prefabricating a box culvert, welding a steel shield and a steel blade foot, and installing a jack and a jacking iron on the back of the box culvert; lifting the box culvert, removing the support piles for the working pit, jacking the box culvert section by section, and suspending jacking when the steel blade foot approaches the outside of the existing vertical shaft structure; opening a hole in the vertical shaft, and constructing a waterproof device in the vertical shaft; continuing to jack the box culvert, entering the vertical shaft to receive the waterproof device, grouting and sealing the joints of the box culvert and the vertical shaft, removing the back beam of the working pit, and constructing an open-cut cast-in-place section box culvert. The invention can realize rapid repair of culverts under normal traffic on the highway.

Description

Technical Field

[0001] The invention belongs to the field of building construction, and in particular relates to an emergency repair method for a highway culvert. Background Art

[0002] At present, with the implementation of my country's strategy of building a strong transportation nation, the mileage of operating expressways is increasing year by year, and the number of damaged culverts on expressways with a long service life will increase in the foreseeable future. At present, there are also pipe network renewal technologies in municipal engineering, but most of them are small-diameter circular culvert repairs or replacements. Most expressway culverts are large-section rectangular culverts. Currently, daily inspections are mostly used to detect culvert diseases in a timely manner, and then grouting reinforcement or structural reinforcement are used to repair and treat them in situ; when a culvert is suddenly damaged, the current method is to close half of the lane or build a temporary relocation road, excavate the existing culvert in situ, and then cast a new culvert in situ. This method has a great interference with highway driving and high construction costs. Summary of the invention

[0003] In view of the above situation, the present invention provides an emergency repair method for highway culverts, which does not require closing highway lanes or building temporary relocation roads, has low cost, high safety, and little driving interference.

[0004] To achieve the above object, the technical solution adopted by the present invention is:

[0005] A method for emergency repair of highway culverts, comprising the steps of:

[0006] The highway embankment slope is reinforced by small pipe grouting, the soil within the top range of the box culvert is reinforced by sleeve valve pipe grouting, and the arch culvert and some shafts are backfilled with underwater concrete;

[0007] Construction of anti-slide piles at the foot of the highway slope, construction of jacking pit support piles and water-stop curtains;

[0008] Construct the crown beam and plate support of the jacking working pit, excavate the working pit, cast the slide plate on the side of the working pit close to the shaft, construct the back beam on the side of the working pit away from the shaft, and construct the shaft reinforcement ring beam;

[0009] Prefabricated box culvert, with steel shield and steel blade feet welded at one end of the culvert in the jacking direction, the bottom of the culvert is placed on the slide plate, and the jack and jacking iron are installed between the back of the culvert and the back beam;

[0010] The box culvert is lifted, the supporting piles of the working pit are removed, and the box culvert is pushed in section by section. When the steel blade foot approaches the outside of the existing shaft structure, the jacking is stopped;

[0011] The shaft is opened and the waterproof device is received in the construction shaft;

[0012] The box culvert continues to be pushed forward and enters the vertical shaft to receive the waterproof device. The joints between the box culvert and the vertical shaft are grouting-sealed. The back beam of the working pit is removed, the open-cut cast-in-place box culvert section is constructed, and the foundation pit is backfilled.

[0013] Furthermore, after the foundation pit is backfilled, the following steps are also included: restoring the greening of the highway roadbed slope.

[0014] Furthermore, the construction of jacking the box culvert section by section also includes sealing the joints of adjacent box culverts. The box culvert joints are connected with steel plates and extruded waterstops and reserved grouting pipes are set for waterstopping.

[0015] Furthermore, before constructing the shaft reinforcement ring beam, an exploratory hole is first drilled to determine the thickness of the existing shaft side wall structure.

[0016] Furthermore, C40 concrete is used to reinforce the ring beam.

[0017] Furthermore, after the box culvert is jacked into place, it also includes: constructing a post-cast ring beam at the reinforced ring beam and the end of the box culvert, and the post-cast ring beam adopts C40 slightly expansive concrete.

[0018] Furthermore, the post-cast ring beam and the end of the box culvert are adhered with a water-swelling rubber waterstop strip using a single-component chloroprene phenolic adhesive, and a slow-expansion agent is applied externally.

[0019] The present invention adopts the above technical solution, which has the following beneficial effects:

[0020] (1) Foresight: It solves the problem of repairing damaged culverts on operating highways.

[0021] (2) Economical: The present invention does not require the construction of temporary roads to relocate the expressway, and the construction cost is low.

[0022] (3) Safety: The expressway does not require the construction of temporary relocation roads or half-width traffic control, resulting in low traffic interference and high safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figures 1 to 9 The invention discloses a construction flow chart of the emergency repair method for a highway culvert.

[0025] Figures 10-12 There are three options for stabilizing the tunnel face, which are determined based on the actual situation on site after the on-site exploration pit is dug. If the geological conditions are good, the second plan can be adopted ( Fig.11 ) Even without special measures to stabilize the tunnel face, if the soil slope stability is poor, the first option ( Fig.10 ), the third plan ( Fig.12 ) is used when stability is extremely poor or problems occur.

[0026] Fig.13 This is the box culvert joint waterproofing design drawing.

[0027] Fig.14 This is the design drawing of the reserved groove for the rubber waterstop.

[0028] Fig.15 This is the design drawing for the vertical shaft opening.

[0029] Fig.16 It is a cross-sectional view of the shaft opening.

[0030] Fig.17 This is the design drawing of reinforced ring beam.

[0031] Fig.18 This is the design drawing of post-cast ring beam.

[0032] The corresponding relationship of the marks in the figure is as follows:

[0033] 1-existing shaft; 11-existing shaft floor; 12-existing shaft side wall; 13-existing shaft cover; 2-small pipe grouting reinforcement scope; 3-sleeve valve pipe reinforcement scope; 4-C20 underwater concrete backfill; 5-working pit; 51-back pile; 52-anti-slide pile; 53-crown beam; 54-slide plate; 55-back beam; 56-jack; 57-top iron; 58-prefabricated box culvert; 581-open cut cast-in-place box culvert; 59-blade foot; 6-reinforcement Ring beam; 61-post-cast ring beam; 7-steel grid; 71-retaining breast plate; 72-precast block; 73-earth-moving trolley; 74-small excavator; 75-steel pipe; 76-steel frame; 77-full-section grouting reinforcement; 8-water-swelling rubber; 81-chloroprene rubber; 82-HJL two-component polysulfide sealant; 83-C40 fine stone concrete backfill; 9-anchored reinforcement; 91-12mm thick Q235B steel plate; 92-single-component water-swelling sealant. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] The present invention is applied to the emergency repair of culverts under normal operating highways when they are damaged. Considering the passage of people and vehicles and flood control and drainage, many highway culverts have been built. Over the years, the damage and destruction of culverts are inevitable. Culvert repair is mostly an emergency project. Once delayed, it will not only affect the travel needs of the people, but also may cause flooding disasters during the rainy season. Highways have a large volume of traffic, and the cost and construction period of newly built temporary relocation roads are high. In addition, the technical standards of general relocation roads are low, the driving speed is slow and the comfort is poor, and traffic accidents are easily caused by congestion during construction. The present invention can realize the rapid repair of culverts under the premise of normal traffic on the highway, without closing the highway lanes and building temporary relocation roads. It has low cost, high safety, and little driving interference, providing an effective solution for similar projects.

[0036] When existing highway culverts are found to have defects in time, they can be repaired in situ by grouting reinforcement or structural reinforcement. When a culvert is suddenly damaged, the current approach is to close half of the lane or build a temporary relocation road, excavate the existing culvert in situ, and then cast a new culvert. This approach causes great interference to highway traffic and has high construction costs.

[0037] The features and other related features of the present invention are further described in detail below in conjunction with the accompanying drawings to facilitate understanding by technicians in the same industry.

[0038] like Figures 1 to 9 The design and construction flow chart of the highway culvert emergency repair method of the present invention mainly includes the following steps:

[0039] Step 1: Construction Preparation ( Figure 1 )

[0040] 1. Preparation of machines and equipment;

[0041] 2. Lay out the lines and level the construction site;

[0042] 3. Lay out lines and construct temporary ditches.

[0043] Step 2: Grouting reinforcement ( Figure 2 )

[0044] 1. Grouting reinforcement of sleeve valve pipe in the top range of box culvert;

[0045] 2. Small pipe grouting reinforcement of highway roadbed;

[0046] 3. Grouting reinforcement of collapsed retaining wall;

[0047] 4. C20 underwater concrete backfill construction of arch culvert and part of vertical shaft.

[0048] Step 3: Construction of pit protection structure ( Figure 3 )

[0049] 1. Construction of anti-slide piles at the foot of the highway 52;

[0050] 2. Construction jacking working pit support piles (back piles 51);

[0051] 3. Construction of water-stop curtain in jacking working pit.

[0052] Step 4: Construction pit ( Figure 4 )

[0053] 1. Construct the top beam 53 and support plate of the jacking working pit, and the top beam 53 is connected to the top of the back pile 51;

[0054] 2. Dig a working pit 5 between the anti-sliding pile 52 and the back pile 51;

[0055] 3. Cast a slide plate 54 at the bottom of the working pit 5, close to one side of the existing shaft;

[0056] 4. The bottom of the working pit 5 is away from the existing shaft and the back beam 51 is constructed;

[0057] 5. Corresponding to the jacking position of the box culvert to be constructed, a shaft reinforcement ring beam 6 is constructed in the shaft.

[0058] Step 5: Prefabricated box culvert ( Figure 5 )

[0059] 1. Prefabricated box culvert 58;

[0060] 2. Weld the steel shield and steel blade foot 59 at one end of the box culvert 58 in the jacking direction, and construct the steel grid;

[0061] 3. The bottom of the box culvert 58 is placed on the slide plate 54 , and a jack 56 and a top iron 57 are installed between the back of the box culvert 58 and the back beam 51 .

[0062] Step 6: Box culvert top lifting ( Figure 6 )

[0063] 1. Lift the top and check whether all equipment and structures are normal;

[0064] 2. Remove the supporting piles in the working pit section;

[0065] 3. Push in a pick, return the oil to shrink the top, add a top iron, and push in another pick;

[0066] 4. The first section of the box culvert is pushed in.

[0067] Step 7: Continue to push and close the box culvert ( Figure 7 )

[0068] 1. Measure and locate, and hoist the second section of the box culvert onto the slide in the working pit;

[0069] 2. Waterproof treatment of box culvert joints;

[0070] 3. The second section of the box culvert is pushed in, and the first and second sections of the box culvert are closed;

[0071] 4. Repeat the previous steps and stop pushing when the steel blade foot approaches the outside of the existing shaft structure.

[0072] Step 8: Shaft opening ( Figure 8 )

[0073] 1. When the box culvert is pushed forward to about 20cm from the side wall of the shaft, the shaft begins to open;

[0074] 2. Construction of a shaft receiving waterproof device. The receiving waterproof device is an existing technology, similar to the shield machine head receiving device in the shield receiving shaft, such as a steel box, with one side opening connected to the shaft ring beam, and is used to receive the front end shield of the first section of the box culvert after the shaft is opened;

[0075] 3. Push in a pick, return the oil to shrink the top, add a top iron, and push in another pick;

[0076] 4. Measure and locate, and hoist the eighth section (the last section) of the box culvert to the working pit;

[0077] 5. Waterproof treatment of the joints of the seventh and eighth sections of the box culvert;

[0078] 6. The eighth section of the box culvert is pushed in and closed with the seventh section of the box culvert;

[0079] 7. The first to eighth sections of the box culverts are all jacked into place.

[0080] Step 9: Subsequent construction ( Fig. 9 )

[0081] 1. Treatment of box culvert and shaft joints;

[0082] 2. Grouting of box culvert joints;

[0083] 3. Remove the back beam and back piles of the working pit;

[0084] 4. Construction of open cut cast-in-place box culvert 581;

[0085] 5. Backfill the foundation pit;

[0086] 6. Ditch dredging and temporary ditch removal;

[0087] 7. Restore greening of highway roadbed slopes.

[0088] Further, such as Figures 10-12 As shown in the figure, there are three schemes for stabilizing the tunnel face according to the present invention, which are determined according to the actual situation on site after the on-site exploration pit is dug. If the geological conditions are good, the second scheme ( Fig.11) Even without special measures to stabilize the tunnel face, if the soil slope stability is poor, the first option ( Fig.10 ), the third plan ( Fig.12 ) is used when stability is extremely poor or problems occur.

[0089] Fig.13 and Fig.14 This is the waterproof design drawing of the box culvert joint. The inner end of the steel pipe box culvert for grouting should be threaded to connect the grouting pipe. The reserved outer surface opening of the steel pipe box culvert is blocked by welding with a 3mm thick steel plate after demoulding. It is knocked open with a steel chisel before grouting, and then grouting. The embedded steel pipe at each joint should be grouted continuously. The grouting volume of each steel pipe is 2.6m. When the grouting pressure is low, cement mortar should be pressed in until the grouting pressure exceeds 1MPa. Before closing the two sections of the box culvert, first apply HJL two-component polysulfide sealant to the two closing interfaces, apply it multiple times so that the thickness on both sides is not less than 1.5cm, and then push it in to close. When closing, try to tighten it as much as possible so that the water stop and sealant between the two box culverts are in close contact under pressure. The permeable crystallization material is used on the two sides and top surface of the outer surface of the box culvert, and paraffin is sprayed on both sides and the upper surface of the outer surface of the box culvert. The joints of water-expandable rubber and chloroprene rubber should be staggered by more than 50cm.

[0090] like Fig.15 and Fig.16 The figure shows the design drawing of the shaft opening. Before reinforcing the ring beam, a exploratory hole should be drilled to determine the thickness of the existing shaft side wall structure. The monitoring and measurement of the shaft structure at the opening should be strengthened, including vertical and horizontal deformations. The monitoring frequency should be appropriately increased according to the actual situation to achieve information-based construction. The side wall opening needs to be meticulously constructed. It is recommended to use water drilling and other methods that cause less disturbance to the existing structure. After the strength of the reinforced ring beam reaches 100% and the box culvert is pushed in close to the shaft opening area, the hole can be gradually opened to the designed size. Before the shaft is opened, two vertical φ609 steel pipe top supports are set in the shaft to support the shaft cover. It is recommended to open the shaft wall when the jacking is close to 20cm from the shaft.

[0091] like Fig.17 and Fig.18 The figure shows the design drawings of the reinforced ring beam and the post-cast ring beam. After the box culvert is put into place, it also includes: constructing the post-cast ring beam at the reinforced ring beam and the end of the box culvert. The reinforced ring beam uses C40 concrete, and the post-cast ring beam uses C40 micro-expansion concrete. The post-cast ring beam and the end of the box culvert are glued with a water-expanding rubber water stop strip with a single-component chloroprene phenolic adhesive, and a slow expansion agent is applied on the outside, and the positioning steel bars are bent.

[0092] The key points of the present invention are that the damaged and abandoned culverts need to be backfilled densely with underwater concrete with good fluidity, and then the cavities that may be generated by the concrete backfilling are filled by ground drilling and grouting; the new culvert is constructed by the box culvert jacking method, and the box culvert joints are connected by steel plates, extruded water stop strips and reserved grouting pipes for water stopping; the highway slope is reinforced by small catheter grouting to enhance the overall performance of the slope and reduce the disturbance of the highway to the jacking construction; the reinforcement and opening of the existing shaft are the key to realizing the reception of the jacking box culvert without a working receiving shaft, first the reinforced ring beam is constructed and then the hole is opened, and after the box culvert is jacked into place, the post-cast ring beam is constructed to ensure the effective connection between the box culvert and the existing shaft.

[0093] Compared with the prior art, the present invention has the following advantages

[0094] (1) Foresight: It solves the problem of repairing damaged culverts on operating highways.

[0095] (2) Economical: The present invention does not require the construction of temporary roads to relocate the expressway, and the construction cost is low.

[0096] (3) Safety: The expressway does not require the construction of temporary relocation roads or half-width traffic control, resulting in low traffic interference and high safety.

[0097] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0098] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A highway culvert emergency repair method, characterized in that: Includes steps: The highway embankment slope is reinforced by small pipe grouting, the soil within the top range of the box culvert is reinforced by sleeve valve pipe grouting, and the arch culvert and some shafts are backfilled with underwater concrete; Construction of anti-slide piles at the foot of the highway slope, construction of jacking pit support piles and water-stop curtains; Construct the crown beam and plate support of the jacking working pit, excavate the working pit, cast the slide plate on the side of the working pit close to the shaft, construct the back beam on the side of the working pit away from the shaft, and construct the shaft reinforcement ring beam; Prefabricated box culvert, with steel shield and steel blade feet welded at one end of the culvert in the jacking direction, the bottom of the culvert is placed on the slide plate, and the jack and jacking iron are installed between the back of the culvert and the back beam; The box culvert is lifted, the supporting piles of the working pit are removed, and the box culvert is pushed in section by section. When the steel blade foot approaches the outside of the existing shaft structure, the jacking is stopped; The shaft is opened and the waterproof device is received in the construction shaft; The box culvert continues to be pushed forward, and the waterproof device is received in the shaft. The joints of the box culvert and the shaft are grout-sealed. The back beam of the working pit is removed, and the open-cut cast-in-place box culvert is constructed, and the foundation pit is backfilled. The vertical and lateral deformations of the shaft structure at the opening are monitored and measured; before the shaft is opened, two vertical steel pipe top supports are set in the shaft to support the shaft cover.

2. The highway culvert emergency repair method according to claim 1, characterized in that: After the foundation pit is backfilled, the following steps are also included: Restoration of greening of the highway roadbed slopes.

3. The highway culvert emergency repair method according to claim 1, characterized in that: The construction of jacking the box culvert section by section also includes sealing the joints of adjacent box culverts. The box culvert joints are connected with steel plates and extruded waterstops and reserved grouting pipe waterstops are set.

4. The highway culvert emergency repair method according to claim 1, characterized in that: Before constructing the shaft reinforcement ring beam, drill an exploration hole to determine the thickness of the existing shaft side wall structure.

5. The highway culvert emergency repair method according to claim 4 is characterized in that: C40 concrete is used to reinforce the ring beam.

6. The highway culvert emergency repair method according to claim 5, characterized in that: After the box culvert is jacked into place, it also includes: constructing a post-cast ring beam at the reinforced ring beam and the end of the box culvert, and the post-cast ring beam uses C40 slightly expansive concrete.

7. The highway culvert emergency repair method according to claim 6, characterized in that: The post-cast ring beam and the end of the box culvert are bonded with a water-swelling rubber waterstop strip using a single-component chloroprene phenolic adhesive, and a slow-expansion agent is applied externally.

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