Construction and protection device and method for new box culvert crossing construction at existing pipeline

Abstract

The application belongs to the technical field of civil engineering, and particularly discloses a new box culvert intersection construction and protection device and method for existing pipelines, which comprises a steel sleeve pipe, an outer sleeve pipe and double-layer fish mouth rubber.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of civil engineering, more specifically, to a new box culvert intersection construction and protection device and method at an existing pipeline. BACKGROUND

[0002] In recent years, with the development of cities and the increase of population, the existing urban infrastructure has been unable to meet the needs of people's transportation and life. Therefore, most cities in China have carried out urban rapid transformation projects, including underground drainage engineering, road engineering, bridge engineering, etc. Among them, drainage engineering usually refers to the construction of new box culverts and pipelines underground. However, in actual construction, new box culverts inevitably conflict with existing pipelines in plane and elevation at the same time. To solve this problem, the existing pipeline is usually relocated first, and then the new box culvert is constructed. However, pipeline relocation has the characteristics of high relocation cost, long relocation period, etc., resulting in the need for long-term road occupation and construction, which brings great inconvenience to urban residents. In addition, due to the complexity of urban underground pipelines and the large deviation between the existing underground pipeline as-built drawings and the actual situation, it is only possible to determine whether the existing underground pipeline affects the design of the drainage box culvert by on-site exploration after the site is enclosed. For existing pipeline conditions that have an impact, the existing pipeline is usually relocated first, and then the design of the drainage box culvert is constructed. However, in the actual process, the high cost and long period of pipeline relocation restrict the construction of the drainage box culvert, which in turn affects subsequent construction, and long-term road occupation and construction have a great impact on nearby residents and urban traffic.

[0003] At present, a large number of studies on pipeline protection during box culvert and pipeline construction have been carried out in China. For example, Chinese patent CN214037137U discloses a rainwater box culvert crossing underground pipeline protection device for rainwater box culvert crossing underground pipeline protection. Chinese patent CN208348675U discloses a gas pipe protection device for gas pipe crossing existing box culvert for gas pipe crossing existing box culvert protection, etc. Chinese patent CN220224994U discloses a cross-foundation gas pipeline protection intelligent box, which can fully protect the crossing gas pipeline and avoid collision and damage of the gas pipeline during construction. The pipeline to be protected is parallel to the box culvert. The above-mentioned patents do not consider the influence of box culvert settlement on the intersection point after construction, etc.

[0004] Based on the above-mentioned defects and shortcomings, there is an urgent need in the field to propose a design of a drainage box culvert without relocating the pipeline, which avoids the influence of box culvert settlement on the existing pipeline after construction, and also effectively solves the problem of water seepage from the box culvert into the outside of the box culvert, causing the soil outside the box culvert to settle, etc. SUMMARY

[0005] In view of the above defects or improvement needs of the prior art, the present application provides a device and method capable of overcoming the influence of pipelines while ensuring normal construction. The method can be used to construct a box culvert without pipeline relocation, without affecting the pipelines, and without causing problems such as cracking and leakage at the intersection. Specifically, the present application designs a drainage box culvert without pipeline relocation; a steel sleeve and an outer sleeve that can satisfy the settlement of the box culvert are arranged to avoid the influence of the settlement of the box culvert after construction on the existing pipelines; and a double "fish mouth" rubber is arranged at the steel sleeve and the existing pipeline to avoid the water in the box culvert from seeping outside the box culvert, causing the soil outside the box culvert to settle when it encounters water, and other series of problems. The device of the present application has a simple structure, simple construction operation, easy-to-ensure construction quality, high economic and social benefits.

[0006] To achieve the above-mentioned purpose, according to one aspect of the present application, a device for new box culvert intersection construction and protection at an existing pipeline is provided, comprising:

[0007] A steel sleeve 1 is arranged through the side wall 5 of the box culvert along the arrangement direction of the existing pipeline 2, and a gap is provided between the inner wall of the steel sleeve 1 and the outer wall of the existing pipeline 2. The outer side wall of the steel sleeve 1 is also provided with a fixed connection water stop element fixedly connected with the side wall 5 of the box culvert;

[0008] An outer sleeve 7 is arranged on the outer wall of the side wall 5 of the box culvert, and the outer sleeve 7 is sleeved on the outer surface of the existing pipeline 2 to prevent the soil at the outer wall of the side wall 5 of the box culvert and the steel sleeve 1 from contacting;

[0009] A double "fish mouth" rubber 6 is arranged on the inner wall side of the side wall 5 of the box culvert, and one end of the double "fish mouth" rubber 6 is sleeved on the outer side wall of the steel sleeve 1, and the other end is sleeved on the outer side wall of the existing pipeline 2 to prevent the water in the box culvert from entering the soil outside the box culvert through the steel sleeve 1 when the box culvert is in operation.

[0010] As a further preferred, the double "fish mouth" rubber 6 comprises a trapezoidal rubber sheet 6a, one end of the trapezoidal rubber sheet 6a is sleeved on the outer side wall of the steel sleeve 1, and the other end is sleeved on the outer side wall of the existing pipeline 2;

[0011] The double "fish mouth" rubber 6 further comprises two rectangular rubber sheets 6b, one end of one of the rectangular rubber sheets 6b is sleeved on the outer side wall of the steel sleeve 1, and the other end is welded on the trapezoidal rubber sheet 6a, and one end of the other rectangular rubber sheet 6b is sleeved on the outer side wall of the existing pipeline 2, and the other end is welded on the trapezoidal rubber sheet 6a.

[0012] As a further preferred, the end of the double-layer "fish mouth" rubber 6 is connected with the outer wall of the steel sleeve 1 or the existing pipeline 2 by the strap 11 to form a double-layer sealing protection zone between the steel sleeve 1 and the existing pipeline 2;

[0013] The strap 11 comprises a steel band provided with locking teeth, and a metal buckle, one end of the steel band is fixedly connected with the metal buckle, and the other end passes through the metal buckle, so that after the steel band is pulled tight, the metal buckle is buckled on the corresponding locking teeth.

[0014] As a further preferred, the contact surface of the steel sleeve 1 and the double-layer "fish mouth" rubber 6 is provided with a polished anti-skid layer, and the contact surface of the existing pipeline 2 and the double-layer "fish mouth" rubber 6 is also provided with a polished anti-skid layer.

[0015] As a further preferred, a waterproof lubricating layer is further included, which is arranged between the outer sleeve 7 and the side wall 5 of the box culvert;

[0016] The waterproof lubricating layer is arranged within a range of 50-100 cm around the outer periphery of the existing pipeline 2.

[0017] As a further preferred, a medium-coarse sand layer 9 is further included, which is arranged on the outer surface of the side wall 5 of the box culvert, and the medium-coarse sand layer 9 is backfilled within a specified radius range around the outer periphery of the outer sleeve 7 to prevent soil voiding around the existing pipeline 2 when the box culvert settles;

[0018] The medium-coarse sand layer 9 at least covers the outer sleeve 7.

[0019] As a further preferred, the outer sleeve 7 comprises a fixedly connected outer sleeve base 7a and an outer sleeve inner hollow cylinder 7b, the outer sleeve base 7a is arranged close to the side wall 5 of the box culvert, and the inner diameter of the outer sleeve inner hollow cylinder 7b is greater than the outer diameter of the existing pipeline 2.

[0020] As a further preferred, the fixedly connected waterstop comprises a plurality of waterstop pieces 3 arranged along the outer lateral wall of the steel sleeve 1 and between the steel sleeve 1 and the side wall 5 of the box culvert,

[0021] The fixedly connected waterstop further comprises a plurality of U-shaped steel bars 4a arranged with openings upward and downward, the U-shaped steel bars 4a are wrapped in pairs and oppositely around the steel sleeve 1, one end of the U-shaped steel bars 4a is arranged close to the outer lateral wall of the steel sleeve 1, and the other end is fixedly connected with the steel bars on the side wall 5 of the box culvert;

[0022] Preferably, a plurality of transverse bars 4b fixedly connecting the U-shaped steel bars 4a are further arranged along the central axis direction of the steel sleeve 1.

[0023] As a further preferred, the steel sleeve 1 comprises two rectangular plates 1b arranged in parallel and two semicircular plates 1a respectively connecting the two rectangular plates 1b, the center axis of the existing pipeline 2 is collinear with the center axis of one of the semicircular plates 1a, and the radius of the semicircular plate 1a is greater than the radius of the existing pipeline 2.

[0024] According to another aspect of the present application, a construction method of a new box culvert intersection construction and protection device at an existing pipeline is also provided, comprising the following steps:

[0025] Step one, preparing a steel sleeve 1, the cross section of the steel sleeve 1 is larger than the cross section of the existing pipeline 2, a fixed connection water stop is prepared and installed on the outer surface of the steel sleeve 1 and is fixedly connected with the steel bars on the side wall 5 of the box culvert, so that the center line direction of the steel sleeve 1 is parallel to the center line direction of the existing pipeline 2, a gap is provided between the inner wall of the steel sleeve 1 and the outer wall of the existing pipeline 2, and one end of the steel sleeve 1 is flush with the outer wall of the side wall 5 of the box culvert;

[0026] Step two, applying a waterproof lubricating layer around the existing pipeline 2 within a range of 50cm-100cm on the outside of the side wall 5 of the box culvert, and sticking the outer sleeve 7 to the outside of the side wall 5 of the box culvert, so as to facilitate the reduction of friction between the side wall 5 of the box culvert and the outer sleeve 7 during the settlement of the box culvert, and avoid affecting the existing pipeline 2;

[0027] Step three, after the completion of the construction of the box culvert, backfilling a medium-coarse sand layer 9 around the outer sleeve 7, so as to prevent the soil around the existing pipeline 2 from being empty during the settlement of the box culvert;

[0028] Step four, preparing a double-layer "fish mouth" type rubber 6, and installing the double-layer "fish mouth" type rubber 6 on the inner wall side of the side wall 5 of the box culvert, and sleeving one end of the double-layer "fish mouth" type rubber 6 on the outer side wall of the steel sleeve 1 and the other end on the outer side wall of the existing pipeline 2, so as to prevent the water in the box culvert from entering the soil outside the box culvert through the steel sleeve 1 during the operation of the box culvert;

[0029] Preferably, step one specifically comprises the following steps:

[0030] (11) The steel sleeve 1 is made of steel material, the cross-sectional shape of the steel sleeve 1 is a cylinder with two semicircles, the inner diameter of the semicircle is 2cm larger than the outer diameter of the existing pipeline 2, and the steel sleeve 1 is made of four parts, i.e. two semicircular plates 1a and two rectangular plates 1b, the four parts are sleeved on the outside of the existing pipeline 2 for welding, the semicircular plates and the rectangular plates are arranged alternately, and the existing pipeline 2 is wrapped with wet geotextile before welding to prevent the welding from affecting the existing pipeline 2;

[0031] (12) Welding a ring-shaped water-stop piece 3 on the outside of the welded and shaped steel sleeve 1, the height of the water-stop piece 3 is not less than 30 mm, and the thickness is not less than 3 mm, so as to prevent water in the box culvert from flowing into the soil outside the box culvert after the box culvert is in operation;

[0032] (13) Binding the reinforcing bars on the outside of the steel sleeve 1, the reinforcing bars include U-shaped reinforcing bars 4a and transverse reinforcing bars 4b, the U-shaped reinforcing bars 4a are wrapped on the outside of the steel sleeve 1 in pairs, and the transverse reinforcing bars 4b are welded and fixed to form an integral whole;

[0033] (14) When the reinforcing bars of the side wall 5 of the box culvert are bound, the welded steel sleeve 1, the U-shaped reinforcing bars 4a and the transverse reinforcing bars 4b are fixed at the reinforcing bars of the side wall 5 of the box culvert, and the reinforcing bars of the side wall 5 of the box culvert are welded with the U-shaped reinforcing bars 4a and the transverse reinforcing bars 4b, so as to fix the steel sleeve 1 firmly;

[0034] (15) The center of one of the arcs of the steel sleeve 1 is in line with the center of the existing pipeline 2, and a gap of 1 cm is provided between the inner wall of the arc and the outer wall of the existing pipeline 2, so as to prevent the existing pipeline 2 from being touched during the sinking of the box culvert, and to ensure the safety of the existing pipeline 2;

[0035] (16) One end of the steel sleeve 1 is flush with the outside of the side wall 5 of the box culvert, so as to prevent the steel sleeve 1 from being subjected to the reaction force of the soil outside when it is sunk synchronously with the box culvert, and the other end of the steel sleeve 1 enters the box culvert by 15-20 cm, so as to be clamped by the double-layer "fish mouth" rubber 6;

[0036] Preferably, the preparation of the double-layer "fish mouth" rubber 6 comprises the following steps:

[0037] (41) Cutting the rubber sheet into a trapezoidal rubber sheet 6a, the lower base of the trapezoidal rubber sheet 6a is 1-2 cm longer than the outer diameter of the steel sleeve 1, the upper base of the trapezoidal rubber sheet 6a is 1-2 cm longer than the diameter of the existing pipeline 2, and the height of the trapezoidal rubber sheet 6a is ensured to wrap the steel sleeve 1 and the existing pipeline 2, the waist edges of the trapezoidal rubber sheet 6a are butt-welded, and the upper and lower bases of the trapezoidal rubber sheet 6a are wrapped and welded on the outside of the existing pipeline 2 and the steel sleeve 1 after being pulled tight;

[0038] (42) Preparing a rectangular rubber sheet 6b, and welding the long edges of the rectangular rubber sheet 6b along the lower base of the trapezoidal rubber sheet 6a, and the welding lines are 20-30 cm away from the lower base of the trapezoidal rubber sheet 6a, the two end points of the long edges of the rectangular rubber sheet 6b are connected end to end, and finally the two short edges of the rectangular rubber sheet 6b are welded and welded along the upper base of the trapezoidal rubber sheet 6a, and the welding lines are 20-30 cm away from the upper base of the trapezoidal rubber sheet 6a;

[0039] (43) Another rectangular rubber sheet 6b is prepared by the method of step (42), so as to form the double-layer "fish mouth" rubber 6.

[0040] Overall, compared with the prior art, the above technical solutions conceived by the present application mainly have the following technical advantages:

[0041] 1. The present application is aimed at the problem of high cost and long period of pipeline relocation in the case of intersection between existing pipeline and newly-built box culvert, and proposes to bury a steel casing pipe in the side wall of the box culvert, which can ensure the settlement of the box culvert within 4-8 cm (or set the settlement range according to the specific situation) without contacting the pipeline, thereby realizing the construction of the intersection box culvert at the existing pipe culvert and avoiding problems such as pipeline damage and box culvert concrete cracking caused by box culvert settlement.

[0042] 2. The present application is aimed at the problem of uneven stress on the existing pipeline outside the box culvert during the settlement process of the box culvert, and proposes to set an outer casing pipe around the existing pipeline outside the box culvert, and to apply vaseline at the contact point with the outer wall of the box culvert, and to backfill medium-coarse sand around the outer casing pipe, thereby preventing stress concentration on the pipeline outside the box culvert during the settlement of the box culvert and causing pipeline damage.

[0043] 3. The present application is aimed at the problem that water easily seeps into the soil outside the box culvert through the side wall of the box culvert after the box culvert is in operation, causing problems such as void around the pipeline and ground subsidence, and proposes to set double "fish mouth" rubber on the outer wall of the steel casing pipe and the existing pipeline inside the box culvert, thereby preventing water from seeping outside during the operation of the box culvert.

[0044] 4. The present application ensures the safety of the existing pipeline during the construction of the newly-built box culvert by setting a steel casing pipe around the existing pipeline and leaving a gap between the steel casing pipe and the existing pipeline, in combination with the use of fixed connection water stop parts. At the same time, the setting of the outer casing pipe further protects the existing pipeline, preventing direct contact and potential damage of the soil to the pipeline, and enhancing the stability of the overall structure.

[0045] 5. The present application adopts a double "fish mouth" rubber design, which forms a double-sealed protection zone through the combination of trapezoidal rubber sheets and rectangular rubber sheets, effectively preventing water in the box culvert from entering the soil outside the box culvert through the steel casing pipe during the operation of the box culvert. In addition, the use of tie straps further ensures the firmness of the rubber seal and improves the waterproof effect.

[0046] 6. The present application applies a waterproof lubricating layer outside the side wall of the box culvert, reducing the friction between the box culvert and the outer casing pipe during the settlement of the box culvert, avoiding the impact on the existing pipeline, and also improving the construction efficiency. The backfill design of the medium-coarse sand layer not only prevents soil voiding, but also helps the stable settlement of the box culvert, reducing additional maintenance costs. The overall design takes into account the convenience and economy of construction, maximizing cost-effectiveness. BRIEF DESCRIPTION OF DRAWINGS

[0047] Figure 1is a sectional view of the new box culvert intersection construction and protection device along the cross section direction of the box culvert that the embodiment of the present application relates to;

[0048] Figure 2 is a sectional view of the new box culvert intersection construction and protection device along the cross section direction of the box culvert that the embodiment of the present application relates to;

[0049] Figure 3 is a structural schematic diagram of the steel sleeve and the fixed connection water stop part that the embodiment of the present application relates to;

[0050] Figure 4 is a structural schematic diagram of the semicircular plate of the steel sleeve that the embodiment of the present application relates to;

[0051] Figure 5 is a structural schematic diagram of the rectangular plate of the steel sleeve that the embodiment of the present application relates to;

[0052] Figure 6 is a structural schematic diagram of the double-layer "fish mouth" type rubber that the embodiment of the present application relates to;

[0053] Figure 7 is a structural schematic diagram of the outer sleeve that the embodiment of the present application relates to;

[0054] Figure 8 is a structural schematic diagram of the new box culvert intersection construction and protection device that the embodiment of the present application relates to.

[0055] In all the drawings, same reference signs represent same technical features, specifically: steel sleeve-1, semicircular plate-1a, rectangular plate-1b, existing pipeline-2, water stop piece-3, U-shaped reinforcing bar-4a, transverse reinforcing bar-4b, box culvert side wall-5, double-layer "fish mouth" type rubber-6, outer sleeve-7, outer sleeve base-7a, outer sleeve inner empty cylinder-7b, water proof part-8, medium coarse sand layer-9, trapezoidal rubber piece-6a, rectangular rubber piece-6b, tie-11, box culvert-12. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical scheme and advantages of the present application more clear and understandable, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other.

[0057] As Figures 1 to 8As shown, the new box culvert intersection construction and protection device provided by the embodiment of the present application has the steel sleeve 1 arranged through the side wall 5 of the box culvert along the arrangement direction of the existing pipeline 2, and a gap is arranged between the inner wall of the steel sleeve 1 and the outer wall of the existing pipeline 2, and the outer side wall of the steel sleeve 1 is further provided with a fixed connection water stop element fixedly connected with the side wall 5 of the box culvert; the outer sleeve 7 is arranged on the outer wall of the side wall 5 of the box culvert, and the outer sleeve 7 is sleeved on the outer surface of the existing pipeline 2 to prevent the steel sleeve 1 from contacting the soil at the outer wall of the side wall 5 of the box culvert; the double-layer "fish mouth" type rubber 6 is arranged on the inner wall side of the side wall 5 of the box culvert, and one end of the double-layer "fish mouth" type rubber 6 is sleeved on the outer side wall of the steel sleeve 1, and the other end is sleeved on the outer side wall of the existing pipeline 2, so as to prevent the water in the box culvert from entering the soil outside the box culvert through the steel sleeve 1 when the box culvert is running.

[0058] Based on any of the above embodiments or a combination of multiple embodiments, in the embodiment, the double-layer "fish mouth" type rubber 6 includes a trapezoidal rubber sheet 6a, one end of the trapezoidal rubber sheet 6a is sleeved on the outer side wall of the steel sleeve 1, and the other end is sleeved on the outer side wall of the existing pipeline 2.

[0059] Based on any of the above embodiments or a combination of multiple embodiments, in the embodiment, the double-layer "fish mouth" type rubber 6 further includes two rectangular rubber sheets 6b, one end of one of the rectangular rubber sheets 6b is sleeved on the outer side wall of the steel sleeve 1, and the other end is welded on the trapezoidal rubber sheet 6a, and one end of the other rectangular rubber sheet 6b is sleeved on the outer side wall of the existing pipeline 2, and the other end is welded on the trapezoidal rubber sheet 6a.

[0060] Based on any of the above embodiments or a combination of multiple embodiments, in the embodiment, the end of the double-layer "fish mouth" type rubber 6 is connected to the outer side wall of the steel sleeve 1 or the existing pipeline 2 through the cable tie 11, so as to form a double-layer sealing protection area between the steel sleeve 1 and the existing pipeline 2.

[0061] Based on any of the above embodiments or a combination of multiple embodiments, in the embodiment, the cable tie 11 includes a steel band, and the steel band is provided with a lock tooth, and the cable tie 11 further includes a metal buckle, one end of the steel band is fixedly connected with the metal buckle, and the other end passes through the metal buckle, so that after the steel band is pulled tight, the metal buckle is buckled on the corresponding lock tooth.

[0062] Based on any of the above embodiments or a combination of multiple embodiments, in the embodiment, the contact surface of the steel sleeve 1 and the double-layer "fish mouth" type rubber 6 is provided with a polished anti-skid layer, and the contact surface of the existing pipeline 2 and the double-layer "fish mouth" type rubber 6 is also provided with a polished anti-skid layer.

[0063] Based on any of the above embodiments or a combination of multiple embodiments, in this embodiment, a waterproof lubricating layer is further included between the outer sleeve 7 and the side wall 5 of the box culvert.

[0064] Based on any of the above embodiments or a combination of multiple embodiments, in this embodiment, the waterproof lubricating layer is arranged within a range of 50-100 cm around the outer periphery of the existing pipeline 2. Preferably, the waterproof lubricating layer is vaseline, or glycerol, or other substances capable of lubricating and waterproofing.

[0065] Based on any of the above embodiments or a combination of multiple embodiments, in this embodiment, a medium-coarse sand layer 9 is further arranged on the outer surface of the side wall 5 of the box culvert, and the medium-coarse sand layer 9 is backfilled within a specified radius range around the outer periphery of the outer sleeve 7 to prevent soil voiding around the existing pipeline 2 when the box culvert settles.

[0066] Based on any of the above embodiments or a combination of multiple embodiments, in this embodiment, the medium-coarse sand layer 9 at least covers the outer sleeve 7.

[0067] Based on any of the above embodiments or a combination of multiple embodiments, in this embodiment, the outer sleeve 7 includes a fixedly connected outer sleeve base 7a and an outer sleeve inner hollow cylinder 7b, the outer sleeve base 7a is arranged close to the side wall 5 of the box culvert, and the inner diameter of the outer sleeve inner hollow cylinder 7b is greater than the outer diameter of the existing pipeline 2.

[0068] Based on any of the above embodiments or a combination of multiple embodiments, in this embodiment, the fixedly connected waterstop includes a plurality of waterstop pieces 3 arranged along the outer lateral wall of the steel sleeve 1 and arranged between the steel sleeve 1 and the side wall 5 of the box culvert.

[0069] Based on any of the above embodiments or a combination of multiple embodiments, in this embodiment, the fixedly connected waterstop further includes a plurality of U-shaped steel bars 4a arranged with openings upward and downward, the U-shaped steel bars 4a are wrapped in pairs and oppositely on the outer lateral wall of the steel sleeve 1, one end of the U-shaped steel bars 4a is arranged in close contact along the outer lateral wall of the steel sleeve 1, and the other end is fixedly connected with the steel bars on the side wall 5 of the box culvert.

[0070] Based on any of the above embodiments or a combination of multiple embodiments, in this embodiment, a plurality of transverse bars 4b fixedly connecting the U-shaped steel bars 4a are further arranged along the central axis direction of the steel sleeve 1.

[0071] Based on any of the above embodiments or a combination of multiple embodiments, in this embodiment, the steel sleeve 1 includes two rectangular plates 1b arranged in parallel and a semicircular arc plate 1a connected to the two rectangular plates 1b respectively, the central axis of the existing pipeline 2 is collinear with the central axis of one of the semicircular arc plates 1a, and the radius of the semicircular arc plate 1a is greater than the radius of the existing pipeline 2.

[0072] According to another aspect of the present application, there is also provided a construction method of a new box culvert intersection construction and protection device at an existing pipeline, comprising the following steps:

[0073] Step one, prepare a steel sleeve 1, the cross section of the steel sleeve 1 is larger than the cross section of the existing pipeline 2, a fixed connection water stop is prepared and installed on the outer surface of the steel sleeve 1, and the fixed connection water stop is fixedly connected with the steel bars on the side wall 5 of the box culvert, so that the center line direction of the steel sleeve 1 is parallel to the center line direction of the existing pipeline 2, a gap is provided between the inner wall of the steel sleeve 1 and the outer wall of the existing pipeline 2, and one end of the steel sleeve 1 is flush with the outer wall of the side wall 5 of the box culvert.

[0074] Step one specifically comprises the following steps:

[0075] (11) The steel sleeve 1 is made of steel material, the cross section shape of the steel sleeve 1 is a cylinder with two semicircles, the inner diameter of the semicircle is 2 cm larger than the outer diameter of the existing pipeline 2, and the steel sleeve 1 is made of four parts, i.e. two semicircular arc plates 1a and two rectangular plates 1b. The four parts are sleeved outside the existing pipeline 2 for welding, the semicircular arc plates and the rectangular plates are arranged alternately, and the existing pipeline 2 around is wrapped with wet geotextile before welding to prevent the welding from affecting the existing pipeline 2;

[0076] (12) A ring-shaped water stop piece 3 is welded on the outside of the welded steel sleeve 1, the height of the water stop piece 3 is not less than 30 mm, and the thickness is not less than 3 mm, so as to prevent water in the box culvert from flowing into the soil outside the box culvert along the outer wall of the steel sleeve 1 after the box culvert is in operation;

[0077] (13) Strengthening ribs are bound on the outside of the steel sleeve 1, the strengthening ribs include U-shaped steel bars 4a and transverse ribs 4b, the U-shaped steel bars 4a are oppositely wrapped on the outside of the steel sleeve 1, and the transverse ribs 4b are welded and fixed to form an integral whole;

[0078] (14) When the steel bars of the side wall 5 of the box culvert are bound, the welded steel sleeve 1 and the U-shaped steel bars 4a and the transverse ribs 4b are fixed at the steel bars of the side wall 5 of the box culvert, and the steel bars of the side wall 5 of the box culvert are welded with the U-shaped steel bars 4a and the transverse ribs 4b, so as to facilitate the firm fixation of the steel sleeve 1;

[0079] (15) The center of one of the arcs of the steel sleeve 1 is collinear with the center of the existing pipeline 2, and a gap of 1 cm is provided between the inner wall of the arc and the outer wall of the existing pipeline 2, so as to prevent the existing pipeline 2 from being touched during the sinking process of the box culvert, and to ensure the safety of the existing pipeline 2;

[0080] (16) Steel sleeve 1 one end with box culvert side wall 5 outside flush, easy to with box culvert synchronous sinking when not by the outside soil resistance, steel sleeve 1 the other end into the box culvert 15cm-20cm, easy to double "fish mouth" type rubber 6 is clamped.

[0081] Step two, in the box culvert side wall 5 outside, both pipeline 2 around 50cm-100cm range in the coating waterproof lubricating layer, the outer sleeve 7 with box culvert side wall 5 outside, easy to box culvert settlement, reduce the box culvert side wall 5 and outer sleeve 7 friction, avoid the impact on the existing pipeline 2;

[0082] Step three, after the completion of the box culvert construction, in the outer sleeve 7 around the specified range in the backfill coarse sand layer 9, prevent the box culvert settlement, existing pipeline 2 around the soil void phenomenon appears;

[0083] Step four, preparation of double "fish mouth" type rubber 6, the double "fish mouth" type rubber 6 is installed in the inner wall side of the box culvert side wall 5, and one end of the double "fish mouth" type rubber 6 is sleeved on the outer side wall of the steel sleeve 1, and the other end is sleeved on the outer side wall of the existing pipeline 2, so as to prevent the water in the box culvert from entering the soil outside the box culvert through the steel sleeve 1 when the box culvert is running.

[0084] The preparation of double "fish mouth" type rubber 6 includes the following steps:

[0085] (41) cut the rubber sheet into a trapezoidal trapezoidal rubber sheet 6a, the lower base length of the trapezoidal rubber sheet 6a is greater than the outer diameter of the steel sleeve 1 by 1-2 cm, the upper base of the trapezoidal rubber sheet 6a is greater than the diameter of the existing pipeline 2 by 1-2 cm, and the height of the trapezoidal rubber sheet 6a ensures that the trapezoidal rubber sheet 6a can wrap the steel sleeve 1 and the existing pipeline 2, the waist edge of the trapezoidal rubber sheet 6a is butt welded, and the upper and lower bases of the trapezoidal rubber sheet 6a need to be tightly wrapped and welded on the outer side of the existing pipeline 2 and the steel sleeve 1.

[0086] (42) make a rectangular rubber sheet 6b, weld the long edge of the rectangular rubber sheet 6b along the lower base of the trapezoidal rubber sheet 6a, and the welding line is 20-30 cm away from the lower base of the trapezoidal rubber sheet 6a, the two end points of the long edge of the rectangular rubber sheet 6b are connected end to end, and finally the two short edges of the rectangular rubber sheet 6b are welded, and the long edge of the rectangular rubber sheet 6b is welded along the upper base of the trapezoidal rubber sheet 6a, and the welding line is 20-30 cm away from the upper base of the trapezoidal rubber sheet 6a.

[0087] (43) another rectangular rubber sheet 6b is made by the method of step (42) to form a double "fish mouth" type rubber 6.

[0088] In one embodiment of the present application, a construction scheme and working process of a new box culvert intersection construction and protection device at an existing pipeline are as follows:

[0089] (1) Box culvert side wall inside sleeve production and installation

[0090] The steel sleeve 1 is made of steel material with a thickness of 5 mm, and the cross-sectional shape of the steel sleeve 1 is rectangular plus two semicircles, the inner diameter of the semicircle is about 2 cm larger than the outer diameter of the existing pipeline, and four parts are produced during production, which are two semicircular arc plates 1a and two rectangular plates 1b.

[0091] The four parts are sleeved outside the existing pipeline 2 for welding, the circular arc plate and the rectangular plate are arranged alternately, and the existing pipeline is wrapped with wet geotextile before welding to prevent welding from affecting the pipeline.

[0092] A ring water stop piece 3 is welded around the outside of the welded steel sleeve 1, the height of the water stop piece is not less than 30 mm, and the thickness is not less than 3 mm. After the box culvert is in operation, the water in the box culvert flows into the soil outside the box culvert along the outer wall of the steel sleeve 1.

[0093] The steel sleeve 1 is bound with reinforcing bars outside, the reinforcing bars include U-shaped reinforcing bars 4a and transverse reinforcing bars 4b, the U-shaped reinforcing bars 4a are oppositely wrapped outside the steel sleeve 1, and the transverse reinforcing bars 4b are welded and fixed to form a whole.

[0094] When the box culvert side wall 5 is reinforced, the welded steel sleeve 1, U-shaped reinforcing bars 4a and transverse reinforcing bars 4b are fixed at the reinforcing bars of the side wall 5, and the reinforcing bars of the box culvert side wall are welded with the U-shaped reinforcing bars 4a and the transverse reinforcing bars 4b to facilitate the fixation of the steel sleeve 1;

[0095] The center of the arc of the steel sleeve 1 and the center of the existing pipeline 2 are on the same vertical line, the net distance between the lower arc pipe and the existing pipeline is about 1 cm, and the net distance between the upper arc pipe and the existing pipeline is about 4 cm-8 cm, which can also be determined according to the specific situation (by observing the settlement of adjacent or similar projects and using the hierarchical comprehensive method to calculate, etc.). Prevent the existing pipeline 2 from being touched during the box culvert sinking process, and ensure the safety of the existing pipeline 2.

[0096] One end of the steel sleeve 1 is flush with the outside of the box culvert side wall 5, which facilitates the synchronization of the box culvert sinking without being affected by the reaction force of the outside soil; the other end enters the box culvert by 15 cm-20 cm, which facilitates the clamping of the double-layer "fish mouth" rubber 6.

[0097] (2) Box culvert outer sleeve production and installation

[0098] The box culvert outer sleeve 7 is an empty cylinder with an outer sleeve base 7a, the inner diameter of the outer sleeve empty cylinder 7b is slightly larger than the outer diameter of the existing pipeline 2, and two semicircular arc plates can be made of steel material with a thickness of 5 mm, the length of the semicircular arc plate is not less than 50 cm, two semicircular ring pieces are produced, and the outer diameter of the semicircular ring piece is ensured to prevent the steel sleeve 1 from contacting the soil outside the box culvert side wall 5 during the box culvert settlement. The semicircular ring and the semicircular arc plate are welded, and then welded outside the existing pipeline 2.

[0099] On the outside of the side wall 5 of the box culvert, the waterproofing 8 is applied around the existing pipeline 2 within a range of 50-100 cm, and the outer sleeve base 7a of the outer sleeve 7 is attached to the outside of the side wall 5 of the box culvert (with vaseline in between), so as to facilitate the reduction of friction between the side wall 5 of the box culvert and the outer sleeve 7 during the settlement of the box culvert, and to avoid affecting the existing pipeline 2.

[0100] After the construction of the box culvert is completed, the medium-coarse sand layer 9 is used for backfilling within a range of 500 mm around the outer sleeve 7, so as to prevent the soil around the existing pipeline 2 from being hollowed out during the settlement of the box culvert.

[0101] (3) Rubber production and installation in the box culvert

[0102] The rubber sheet is cut into a trapezoid, the lower base of the trapezoid is about 1-2 cm longer than the outer diameter of the steel sleeve 1, the upper base of the trapezoid is about 1-2 cm longer than the diameter of the existing pipeline 2, and the height of the trapezoid is ensured to be able to wrap the steel sleeve 1 and the existing pipeline 2. The waist of the trapezoidal rubber sheet 6a is butt-welded, and the upper and lower bases are wrapped and welded on the outside of the existing pipeline 2 and the steel sleeve 1 after being pulled tight.

[0103] A rectangular rubber sheet is produced, and the long edges of the rectangular rubber sheet are circumferentially welded along the lower base of the trapezoidal rubber sheet 6a (about 20-30 cm away from the lower base), and the two ends of the long edges are connected end to end, and finally the two short edges of the rectangular rubber sheet are welded. Another rectangular rubber sheet is circumferentially welded along the upper base of the trapezoidal rubber sheet 6a (about 20-30 cm away from the upper base). A double-layer "fish mouth" type rubber 6 is formed.

[0104] Two to three straps 11 are circumferentially arranged on the outside of each rubber sheet along the steel sleeve 1 and the existing pipeline 2 respectively, forming a double-layer sealed protection zone between the steel sleeve 1 and the existing pipeline 2, so as to prevent the water in the box culvert from entering the soil outside the box culvert through the steel sleeve 1 during the operation of the box culvert.

[0105] When the steel sleeve is produced, the outer wall of the steel sleeve located in the box culvert is roughened, so as to facilitate the increase of the friction between the "fish mouth" type rubber 6 and the steel sleeve.

[0106] The working process of the device is as follows:

[0107] 1) Perform foundation pit support and earth excavation, pipeline suspension protection, etc.

[0108] 2) Steel reinforcement, formwork construction and concrete pouring of the bottom plate of the box culvert (including the part above the side wall 30 cm);

[0109] 3) Production of the steel sleeve 1 of the existing pipeline 2, wrapping of the existing pipeline 2 with wet geotextile, welding of the steel sleeve 1 at the side wall 5 of the box culvert, welding of the U-shaped steel reinforcement 4a and the transverse reinforcement 4b;

[0110] 4) Move the steel sleeve 1 to the side wall 5 of the box culvert, and make the steel sleeve 1 flush with the side wall 5 of the box culvert on one side; adopt the cross-shaped reinforcement and position it, and meanwhile increase the U-shaped reinforcement 4a and the transverse reinforcement 4b to be welded;

[0111] 5) Pour the concrete of the side wall 5 and the top plate of the box culvert, maintain it, and remove the formwork;

[0112] 6) Make the outer sleeve 7, and weld it outside the existing pipeline 2; clean the outer surface of the side wall 5 of the box culvert, smear the waterproof element 8, make the outer sleeve base 7a of the outer sleeve 7 close to the outer side of the side wall 5 of the box culvert, backfill the medium-coarse sand layer 9 in the range of 500 mm around the existing pipeline 2 and compact it; and backfill the soil and compact it in the rest part according to the design requirements;

[0113] 7) Make the double-layer "fish mouth" type rubber 6 inside the box culvert, weld it into a ring along the outer wall of the steel sleeve 1 and the existing pipeline 2 respectively, and fasten it by using the tie 11;

[0114] 8) Make the box culvert operate normally.

[0115] Those skilled in the art will easily understand that the above description is only the preferred embodiment of the present application, and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A new box culvert crossing construction and protection device at an existing pipeline, the existing pipeline (2) is arranged to cross the box culvert, characterized in that, include: A steel sleeve (1) is installed through the side wall (5) of the box culvert along the arrangement direction of the existing pipeline (2), and there is a gap between the inner wall of the steel sleeve (1) and the outer wall of the existing pipeline (2). The outer wall of the steel sleeve (1) is also provided with a fixed connection waterstop that is fixedly connected to the side wall (5) of the box culvert. The outer sleeve (7) is provided on the outer wall of the box culvert side wall (5), and the outer sleeve (7) is fitted on the outer surface of the existing pipeline (2) to prevent the steel sleeve (1) from contacting the soil at the outer wall of the box culvert side wall (5); Double-layer "fish mouth" rubber (6) is provided on the inner wall of the box culvert sidewall (5), and one end of the double-layer "fish mouth" rubber (6) is sleeved on the outer wall of the steel sleeve (1), and the other end is sleeved on the outer wall of the existing pipeline (2) to prevent water in the box culvert from entering the soil outside the box culvert through the steel sleeve (1) when the box culvert is running. The double-layer "fish mouth" rubber (6) includes a trapezoidal rubber sheet (6a), one end of which is fitted onto the outer wall of the steel sleeve (1), and the other end is fitted onto the outer wall of the existing pipeline (2); The double-layer "fish mouth" rubber (6) also includes two rectangular rubber sheets (6b), one of which is fitted onto the outer wall of the steel sleeve (1) at one end and welded onto the trapezoidal rubber sheet (6a) at the other end; the other rectangular rubber sheet (6b) is fitted onto the outer wall of the existing pipeline (2) at one end and welded onto the trapezoidal rubber sheet (6a) at the other end. The end of the double-layer "fish mouth" rubber (6) is connected to the outer wall of the steel sleeve (1) or the existing pipeline (2) by a cable tie (11) to form a double-layer sealed protection zone between the steel sleeve (1) and the existing pipeline (2). Including a medium-coarse sand layer (9) on the outer surface of the side wall (5) of the box culvert, and backfilling within a specified radius of the outer perimeter of the outer sleeve (7) with the medium-coarse sand layer (9) to prevent soil voids from occurring when the box culvert settles and around the existing pipeline (2); The fixed connection waterstop includes a plurality of waterstop plates (3) arranged along the outer wall of the steel sleeve (1) and between the steel sleeve (1) and the side wall (5) of the box culvert. The fixed connection waterstop also includes multiple U-shaped steel bars (4a) with openings facing upwards and downwards. The U-shaped steel bars (4a) are wrapped around the outside of the steel sleeve (1) in pairs. One end of the U-shaped steel bar (4a) is attached to the outer wall of the steel sleeve (1), and the other end is fixedly connected to the steel bars on the side wall (5) of the box culvert.

2. The construction and protection device for the intersection of a newly-built box culvert with an existing pipeline according to claim 1, characterized in that, The cable tie (11) includes a steel strip with locking teeth. The cable tie (11) also includes a metal buckle. One end of the steel strip is fixedly connected to the metal buckle, and the other end passes through the metal buckle so that when the steel strip is tightened, the metal buckle is fastened to the corresponding locking teeth.

3. The construction and protection device for the intersection of a newly-built box culvert with an existing pipeline according to claim 2, characterized in that, The contact surface between the steel sleeve (1) and the double-layer "fish mouth" rubber (6) is provided with a polished anti-slip layer, and the contact surface between the existing pipeline (2) and the double-layer "fish mouth" rubber (6) is also provided with a polished anti-slip layer.

4. The construction and protection device for the intersection of a newly-built box culvert with an existing pipeline according to claim 1, characterized in that, Further comprising a waterproof lubricating layer, which is arranged between the outer sleeve (7) and the box culvert side wall (5); The waterproof lubricating layer is arranged within a range of 50-100 cm around the existing pipeline (2).

5. The device for construction and protection of new box culvert intersection with existing pipeline according to claim 1, characterized in that, The medium coarse sand layer (9) covers at least the outer sleeve (7).

6. The construction and protection device for the intersection of a newly-built box culvert with an existing pipeline according to claim 1, characterized in that, The outer sleeve (7) comprises an outer sleeve base (7a) and an outer sleeve inner hollow cylinder (7b) fixedly connected, the outer sleeve base (7a) is arranged close to the box culvert side wall (5), and the inner diameter of the outer sleeve inner hollow cylinder (7b) is greater than the outer diameter of the existing pipeline (2).

7. The construction and protection device for the intersection of a newly-built box culvert with an existing pipeline according to claim 1, characterized in that, Further comprising a plurality of transverse bars (4b) fixedly connected with the U-shaped steel bars (4a) along the central axis direction of the steel sleeve (1).

8. The construction and protection device for the intersection of a newly-built box culvert with an existing pipeline according to claim 1, characterized in that, The steel sleeve (1) comprises two rectangular plates (1b) arranged in parallel and two semicircular arc plates (1a) respectively connected with the two rectangular plates (1b), the central axis of the existing pipeline (2) is collinear with the central axis of one of the semicircular arc plates (1a), and the radius of the semicircular arc plate (1a) is greater than the radius of the existing pipeline (2).

9. A construction method of a new box culvert crossing construction and protection device at an existing pipeline, which is implemented by using the new box culvert crossing construction and protection device at an existing pipeline according to any one of claims 1-8, characterized in that, The method comprises the following steps: Step one, preparing a steel sleeve (1), the cross section of the steel sleeve (1) is greater than the cross section of the existing pipeline (2), a fixedly connected water stop is prepared and installed on the outer surface of the steel sleeve (1), and the fixedly connected water stop is fixedly connected with the steel bars on the box culvert side wall (5), so that the central line direction of the steel sleeve (1) is parallel to the central line direction of the existing pipeline (2), a gap is arranged between the inner wall of the steel sleeve (1) and the outer wall of the existing pipeline (2), and one end of the steel sleeve (1) is flush with the outer wall of the box culvert side wall (5); Step two, applying a waterproof lubricating layer within a range of 50-100 cm around the existing pipeline (2) outside the box culvert side wall (5), and sticking the outer sleeve (7) to the outside of the box culvert side wall (5), so as to reduce the friction between the box culvert side wall (5) and the outer sleeve (7) during the settlement of the box culvert, and avoid affecting the existing pipeline (2); Step three, backfilling a medium coarse sand layer (9) within a specified range around the outer sleeve (7) after the completion of the box culvert construction, so as to prevent the phenomenon of soil voiding around the existing pipeline (2) during the settlement of the box culvert; Step four, preparing a double-layer "fish mouth" type rubber (6), and installing the double-layer "fish mouth" type rubber (6) on the inner wall side of the box culvert side wall (5), one end of the double-layer "fish mouth" type rubber (6) is sleeved on the outer side wall of the steel sleeve (1), and the other end is sleeved on the outer side wall of the existing pipeline (2), so as to prevent the water in the box culvert from entering the soil outside the box culvert through the steel sleeve (1) during the operation of the box culvert.

10. The construction method of a new box culvert intersection construction and protection device at an existing pipeline according to claim 9, characterized in that, Step one specifically comprises the following steps: (11) The steel sleeve (1) is made of steel material, the cross-sectional shape of the steel sleeve (1) is a rectangular plus two semicircular cylinders, the inner diameter of the semicircle is greater than the outer diameter of the existing pipeline (2) by 2 cm, and the steel sleeve (1) is made of four parts, namely two semicircular plates (1a) and two rectangular plates (1b). The four parts are sleeved outside the existing pipeline (2) and welded. The circular arc plate and the rectangular plate are arranged alternately, and the existing pipeline (2) is wrapped with wet geotextile before welding to prevent welding from affecting the existing pipeline (2); (12) A ring-shaped water stop piece (3) is welded outside the welded steel sleeve (1), the height of the water stop piece (3) is not less than 30 mm, and the thickness is not less than 3 mm, so as to prevent water in the box culvert from flowing into the soil outside the box culvert along the outer wall of the steel sleeve (1) after the box culvert is operated; (13) Reinforcing bars are bound outside the steel sleeve (1), the reinforcing bars include U-shaped reinforcing bars (4a) and transverse reinforcing bars (4b), the U-shaped reinforcing bars (4a) are oppositely wrapped outside the steel sleeve (1) in pairs, and the transverse reinforcing bars 4b are welded and fixed to form an integral whole; (14) When the steel reinforcing bars of the side wall (5) of the box culvert are bound, the welded steel sleeve (1) and the U-shaped reinforcing bars (4a) and the transverse reinforcing bars (4b) are fixed to the steel reinforcing bars of the side wall (5) of the box culvert, and the steel reinforcing bars of the side wall (5) of the box culvert are welded with the U-shaped reinforcing bars (4a) and the transverse reinforcing bars (4b), so as to fix the steel sleeve (1) firmly; (15) The center of one of the arcs of the steel sleeve (1) is collinear with the center of the existing pipeline (2), and a gap of 1 cm is provided between the inner wall of the arc and the outer wall of the existing pipeline (2), so as to prevent the existing pipeline (2) from being touched during the sinking process of the box culvert, and to ensure the safety of the existing pipeline (2); (16) One end of the steel sleeve (1) is flush with the outside of the side wall (5) of the box culvert, so that the steel sleeve (1) will not be affected by the reaction force of the outside soil when it is sunk synchronously with the box culvert, and the other end of the steel sleeve (1) enters the box culvert by 15-20 cm, so as to facilitate the clamping of the double-layer "fish mouth" rubber (6).

11. The construction method of a new box culvert intersection construction and protection device at an existing pipeline according to claim 10, characterized in that, The preparation of the double-layer "fish mouth" rubber (6) includes the following steps: (41) The rubber sheet is cut into a trapezoidal trapezoidal rubber sheet (6a), the lower base length of the trapezoidal rubber sheet (6a) is greater than the outer diameter of the steel sleeve (1) by 1-2 cm, the upper base of the trapezoidal rubber sheet (6a) is greater than the diameter of the existing pipeline (2) by 1-2 cm, and the height of the trapezoidal rubber sheet (6a) ensures that the trapezoidal rubber sheet (6a) can wrap the steel sleeve (1) and the existing pipeline (2), the waist edges of the trapezoidal rubber sheet (6a) are butt-welded, and the upper and lower bases of the trapezoidal rubber sheet (6a) need to be tightly wrapped and welded outside the existing pipeline (2) and the steel sleeve (1); (42) A rectangular rubber sheet (6b) is made, and the long edges of the rectangular rubber sheet (6b) are welded along the lower base edge of the trapezoidal rubber sheet (6a) in a ring shape, with the welding line being 20-30 cm away from the lower base edge of the trapezoidal rubber sheet (6a), and the two end points of the long edges of the rectangular rubber sheet (6b) are connected end to end, and finally the two short edges of the rectangular rubber sheet (6b) are welded along the upper base edge of the trapezoidal rubber sheet (6a) in a ring shape, with the welding line being 20-30 cm away from the upper base edge of the trapezoidal rubber sheet (6a); (43) Another rectangular rubber sheet (6b) is made by the method of step (42) to form a double-layer "fish mouth" rubber (6).

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