Gas pipeline outer protection box culvert crossing box culvert construction method

Abstract

The application discloses a construction method of a gas pipeline crossing a box culvert with protection, and comprises the following steps: excavating the concrete of the two inner side walls of a box culvert to be crossed, and sending a protection box culvert into the box culvert to be crossed; excavating the concrete at the joint of the bottom plate of a rainwater box culvert and the side wall of the protection box culvert, and placing steel bars at the joint of the bottom plate of the rainwater box culvert and the side wall of the protection box culvert, at the side wall of the rainwater box culvert, and between the side wall of the protection box culvert and the side wall of the box culvert to be crossed, and welding the steel bars with old steel bars; filling the concrete between the joint of the side wall of the protection box culvert and the bottom plate of the rainwater box culvert, and between the side wall of the protection box culvert and the side wall of the box culvert to be crossed; wrapping viscoelastic bodies and epoxy glass steel on the surface of the gas pipeline in sequence; and filling between the protection box culvert and the gas pipeline. The application can effectively transmit force by the new and old steel bars, realizes the effective force transmission path formed by the protection box culvert and the original box culvert, guarantees the bearing capacity of the original box culvert, forms a corrosion-proof layer and a hardening layer outside the gas pipeline by the viscoelastic bodies and the epoxy glass steel, and effectively prevents the corrosion of the steel pipe and the mechanical damage of the gas pipeline.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas pipe construction, in particular to a gas pipe additional protection box culvert crossing box culvert construction method. BACKGROUND

[0002] With the promotion and popularity of natural gas, a clean energy, the construction of urban gas pipelines is accelerating, and the mileage of urban gas pipelines is increasing day by day. In recent years, in order to solve the increasingly serious urban waterlogging problem, large-scale drainage pipe network reconstruction is carried out in major cities, and many large drainage box culverts are newly built, occupying a large amount of urban underground space. Therefore, the position conflict between the existing underground gas pipelines and the newly built drainage box culverts is becoming increasingly serious.

[0003] The existing gas pipe crossing box culvert generally adopts steel casing protection, that is, a steel casing is newly added outside the gas pipe crossing box culvert. However, this scheme has the following problems:

[0004] (1) Weakening the bearing capacity of the box culvert. In the existing method, the hole is directly opened in the side wall of the box culvert, and the opening diameter is about 1 / 8-1 / 3 of the height of the side wall of the box culvert, which seriously weakens the bearing capacity of the box culvert.

[0005] (2) The gas pipeline is prone to corrosion in the box culvert, which weakens the service life of the gas pipeline. When the gas pipe is made of steel pipe, the steel pipe is prone to corrosion in the case of high humidity and air in the box culvert. Even if anticorrosive measures are taken, the anticorrosive layer is easily damaged due to long-term drainage and washing of water-borne debris, resulting in anticorrosion failure. SUMMARY

[0006] The technical problem to be solved by the present application is to provide a gas pipe additional protection box culvert crossing box culvert construction method which does not weaken the bearing capacity of the original box culvert and can avoid corrosion of the gas pipeline.

[0007] In order to solve the above technical problems, the present application adopts the following technical scheme: a gas pipe additional protection box culvert crossing box culvert construction method, comprising the following steps:

[0008] S1. Excavating the concrete of the two inner side walls of the box culvert to be crossed, and sending the protection box culvert into the box culvert to be crossed;

[0009] S2. Excavating the concrete at the joint of the rainwater box culvert bottom plate and the side wall of the protection box culvert, and placing steel bars at the joint of the rainwater box culvert bottom plate and the side wall of the protection box culvert and the side wall of the rainwater box culvert, and welding the steel bars with the old steel bars of the rainwater box culvert;

[0010] S3. Placing steel bars between the side wall of the protection box culvert and the side wall of the box culvert to be crossed, and welding the steel bars with the old steel bars of the box culvert to be crossed;

[0011] S4. Filling concrete to the joint between the protection box culvert side wall and the rainwater box culvert bottom plate, and between the protection box culvert side wall and the side wall of the to-be-crossed box culvert;

[0012] S5. Wrapping the viscoelastic body and the epoxy glass steel in turn from inside to outside on the surface of the gas pipe;

[0013] S6. Filling the gap between the protection box culvert and the gas pipe.

[0014] Further, in S1, before digging the side walls of the to-be-crossed box culvert, concrete bricks are built outside the side walls of the to-be-crossed box culvert.

[0015] Further, the implanting of the steel bars in S2 is specifically as follows:

[0016] Vertical steel bars are added at the joint between the protection box culvert side wall and the rainwater box culvert bottom plate, and the end of the vertical steel bars close to the rainwater box culvert is bent and implanted into the rainwater box culvert bottom plate;

[0017] Vertical steel bars and horizontal steel bars are added at the side wall of the rainwater box culvert.

[0018] Further, the implanting of the steel bars in S3 is specifically as follows:

[0019] Vertical steel bars and horizontal steel bars are added between the protection box culvert side wall and the side wall of the to-be-crossed box culvert, and the two ends of the vertical steel bars and the horizontal steel bars are bent, and the bent end on one side of the vertical steel bars can be implanted into the rainwater box culvert bottom plate.

[0020] Further, the old steel bars in S2 and S3 are connected through double-sided welding.

[0021] Further, in S4, expanded concrete is used.

[0022] Further, in S6, fine sand is used for filling, and the space between the gas pipe and the protection box culvert is filled in layers.

[0023] Further, it further comprises:

[0024] S7. Setting a cement mortar conical slope outside the built concrete brick.

[0025] The beneficial effects of the present application are as follows:

[0026] The present invention relates to a construction method for gas pipeline external protective box culverts crossing box culverts. By adding and embedding steel bars between the protective box culvert and the rainwater box culvert, and between the protective box culvert and the box culvert to be crossed, and welding them with the original structural steel bars, a strong connection between the new and old steel bars is achieved. During subsequent use, the new and old steel bars can effectively transfer force, forming an effective force transfer path between the newly built gas protective box culvert and the existing box culvert. Furthermore, by embedding steel bars, the new structural steel bars and the old structural concrete have sufficient bond strength, allowing the newly added structural steel bars and the old concrete to be firmly bonded together. In subsequent use, they can share the load without weakening the original box culvert's load-bearing capacity.

[0027] By installing a viscoelastic material on the outside of the gas pipe as the main anti-corrosion measure, the gas pipe is prevented from contacting water and air. Then, an additional epoxy fiberglass protection is added outside the viscoelastic material to form a hardened layer on the gas pipe, which to some extent prevents mechanical damage that the gas pipe may suffer during subsequent construction. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the construction method for externally protected box culverts crossing box culverts according to the present invention;

[0029] Figure 2 This is a front sectional view of the construction process of the externally protected box culvert crossing the box culvert according to the present invention.

[0030] The components in the attached diagram are labeled as follows: 1. Box culvert to be crossed; 2. Protective box culvert; 3. Rainwater box culvert; 4. Concrete brick formwork for construction; 5. Gas pipe; 6. Cement mortar conical slope. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] See Figures 1-2 ,

[0033] This invention discloses a construction method for a gas pipeline externally protected box culvert crossing a box culvert, comprising the following steps:

[0034] S1. Excavate the concrete on the two inner walls of the box culvert 1 to be passed through, and send the protective box culvert 2 into the box culvert 1 to be passed through;

[0035] S2. Open the concrete at the joint of the bottom plate of the rainwater box culvert 3 and the side wall of the protection box culvert 2, and put the steel bars at the joint of the bottom plate of the rainwater box culvert 3 and the side wall of the protection box culvert 2 and the side wall of the rainwater box culvert 3, and weld the steel bars with the old steel bars of the rainwater box culvert 3; in this step, the opening position is Figure 1 the marked A interval, and the opening width is about 500mm on each side, and the opening depth is 50mm.

[0036] S3. Put the steel bars between the side wall of the protection box culvert 2 and the side wall of the to-be-crossed box culvert 1, and weld the steel bars with the old steel bars of the to-be-crossed box culvert 1;

[0037] S4. Fill the concrete at the joint of the side wall of the protection box culvert 2 and the bottom plate of the rainwater box culvert 3, and between the side wall of the protection box culvert 2 and the side wall of the to-be-crossed box culvert 1;

[0038] S5. Wrap the viscoelastic body and the epoxy glass steel outside the surface of the gas pipe 5 from inside to outside; it should be noted that this step only needs to be arranged before S6.

[0039] S6. Fill the gap between the protection box culvert 2 and the gas pipe 5. It should be noted that the gas pipe 5 has been located in the protection box culvert 2 in advance.

[0040] The gas pipeline protection box culvert crossing box culvert construction method has the advantages that by adding the implanted steel bars between the protection box culvert 2 and the rainwater box culvert 3 and between the protection box culvert 2 and the to-be-crossed box culvert 1 and welding the implanted steel bars with the original structure steel bars, the new and old steel bars are firmly connected, in the subsequent use process, the new and old steel bars can effectively transmit force, the newly built gas protection protection box culvert 2 and the existing box culvert form an effective force transmission path, and through the implanted steel bars, the new structure steel bars have sufficient gripping force with the old structure concrete, the newly added structure steel bars and the old concrete are firmly combined, and in the subsequent use, the new and old structures can realize common stress and do not weaken the bearing capacity of the original box culvert.

[0041] By arranging the viscoelastic body outside the gas pipe 5, as the main corrosion prevention measure of the gas pipe 5, the gas pipe 5 is in contact with water and air; then the epoxy glass steel protection is additionally arranged outside the viscoelastic body, a hardening layer is formed on the gas pipe 5, and to a certain extent, mechanical damage that the gas pipe 5 may suffer in the subsequent construction process is prevented.

[0042] In an embodiment, in S1, before opening the two side walls of the to-be-crossed box culvert 1, concrete brick molds 4 need to be built outside the two side walls of the to-be-crossed box culvert 1. Through the design, the concrete brick molds 4 support the side walls of the to-be-crossed box culvert 1, reduce the damage of construction operation to the original structure and the deformation caused by the construction operation, protect the original structure to a certain extent, and on the other hand, the concrete brick molds 4 can be used as a template for the new structure, facilitating the pouring construction.

[0043] And wherein, the width of the side wall of the box culvert 1 to be crossed is about 1.8m, the brick mold thickness of the concrete brick mold is 120mm, and the brick wall block adopts sintered brick MU10.

[0044] In an embodiment, the implanting steel bars in S2 are specifically operated as follows:

[0045] Vertical steel bars are newly added at the side wall of the protection box culvert 2 and the bottom plate of the rainwater box culvert 3, and the end of the vertical steel bars close to the rainwater box culvert is bent and implanted into the bottom plate of the rainwater box culvert 3.

[0046] Vertical steel bars and horizontal steel bars are newly added at the side wall of the rainwater box culvert 3, and wherein the newly added vertical steel bars and horizontal steel bars adopt Φ8, and the horizontal and vertical steel bars are spaced 150mm apart.

[0047] In an embodiment, the implanting steel bars in S3 are specifically operated as follows:

[0048] Vertical steel bars and horizontal steel bars are newly added between the side wall of the protection box culvert 2 and the side wall of the box culvert 1 to be crossed, and the two ends of the vertical steel bars and the horizontal steel bars are bent, and the bent end on one side of the vertical steel bars can be implanted into the bottom plate of the rainwater box culvert 3. And wherein, the newly added steel bars adopt Φ8, the spacing distance between adjacent steel bars is 150mm, and the implanting into the original structure is not less than 150mm.

[0049] In an embodiment, S2 and S3 are connected with the old steel bars through double-sided welding. In this embodiment, the welding length of the steel bars and the old steel bars is 100mm, which is designed to facilitate the connection of the newly added steel bars and the old steel bars, and to achieve effective force transmission.

[0050] In an embodiment, in S4, expanded concrete is adopted. In this design, the concrete can have a certain micro-expansion after solidification, avoiding the self-shrinkage characteristics of general concrete, which can cause cracking between new and old concrete, and through the poured concrete, a protection is formed outside the existing gas pipe 5 protection box culvert 2, which can ensure that the internal gas pipeline is not subjected to external load stress, effectively reducing the possibility of pipeline deformation and damage, and wherein C40 expanded concrete is selected.

[0051] In an embodiment, in S6, fine sand is filled, and the space between the gas pipe 5 and the protection box culvert 2 is layered. In this design, the gas pipe 5 is fixed in the protection box culvert 2 by fine sand, and the subsequent possible gas leakage accumulation after the gas pipeline is damaged can be avoided, and wherein before filling, enough space is reserved between the gas pipe 5 and the protection box culvert 2, the distance between the gas pipe 5 and the side wall is 300mm, and the distance between the gas pipe 5 and the top plate is 100mm, so that the replacement of the subsequent gas pipeline is possible.

[0052] In an embodiment, it further comprises:

[0053] S7. Cement mortar conical slope 6 is arranged outside the masonry concrete brick mold 4. As designed, the cement mortar conical slope 6 has a waterproof effect on one hand, reducing the influence of water on the rust of the steel bars in the protective box culvert 2, and on the other hand, reducing the water blocking effect of the reinforced concrete protective box culvert 2 on the water flow, and wherein the conical slope gradient is 1:1.

[0054] It should be understood that the examples and embodiments described herein are merely for illustration and are not intended to limit the present application, and those skilled in the art can make various modifications or changes to it according to it, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

[0055] It should be noted that if the present application embodiments involve directional indications such as up, down, left, right, front, back, etc., the directional indications are only used to explain the relative positional relationship, motion condition, etc. between components in a certain specific posture, such as shown in the drawings, if the specific posture changes, the directional indications also change accordingly.

[0056] In addition, if the present application embodiments involve descriptions such as "first", "second", etc., the "first", "second", etc. descriptions are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes, taking "A and / or B" as an example, including A scheme, or B scheme, or A and B simultaneously satisfied scheme. In addition, "multiple" means two or more. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the protection scope required by the present application.

Claims

1. A construction method for a gas pipeline external protection crossing a box culvert, characterized in that, It comprises the following steps: S1. Excavate the concrete of the two inner side walls of the box culvert (1) to be crossed, and send the protective box culvert (2) into the box culvert (1) to be crossed; S2. Excavate the concrete at the joint of the bottom plate of the rainwater box culvert (3) and the side wall of the protective box culvert (2), and place steel bars at the joint of the bottom plate of the rainwater box culvert (3) and the side wall of the protective box culvert (2) and at the side wall of the rainwater box culvert (3), and weld the steel bars with the old steel bars of the rainwater box culvert (3); S3. Place steel bars between the side wall of the protective box culvert (2) and the side wall of the box culvert (1) to be crossed, and weld the steel bars with the old steel bars of the box culvert (1) to be crossed; S4. Fill the concrete at the joint of the side wall of the protective box culvert (2) and the bottom plate of the rainwater box culvert (3) and between the side wall of the protective box culvert (2) and the side wall of the box culvert (1) to be crossed; S5. Wrap the viscoelastic body and epoxy glass steel on the surface of the gas pipe (5) from inside to outside; S6. Fill the gap between the protective box culvert (2) and the gas pipe (5).

2. The method of construction of a protective crossing of a gas pipeline by means of a box culvert according to claim 1, characterized in that, In S1, before excavating the two side walls of the box culvert (1) to be crossed, concrete brick molds (4) need to be built outside the two side walls of the box culvert (1) to be crossed.

3. The method of construction of a protective crossing of a gas pipeline by means of a box culvert according to claim 1, characterized in that, The specific operation of implanting steel bars in S2 is: Add vertical steel bars at the joint of the side wall of the protective box culvert (2) and the bottom plate of the rainwater box culvert (3), and bend the end of the vertical steel bars close to the rainwater box culvert (3) and implant it into the bottom plate of the rainwater box culvert (3); Add vertical steel bars and horizontal steel bars at the side wall of the rainwater box culvert (3).

4. The method of construction of a protective crossing of a gas pipeline in a box culvert according to claim 1, characterized in that, The specific operation of implanting steel bars in S3 is: Add vertical steel bars and horizontal steel bars between the side wall of the protective box culvert (2) and the side wall of the box culvert (1) to be crossed, and bend the two ends of the vertical steel bars and the horizontal steel bars, and the bent end of one side of the vertical steel bars can be implanted into the bottom plate of the rainwater box culvert (3).

5. The method of construction of a protective crossing of a gas pipeline in a box culvert according to claim 1, characterized in that, S2 and S3 are connected with the old steel bars through double-sided welding.

6. The method of construction of a protective crossing of a gas pipeline in a box culvert according to claim 1, characterized in that, In S4, expanded concrete is used.

7. The method of construction of a protective crossing of a gas pipeline in a box culvert according to claim 1, characterized in that, In S6, fine sand is used for filling, and the space between the gas pipe (5) and the protective box culvert (2) is filled in layers.

8. The method of construction of a protective crossing of a gas pipeline in a box culvert according to claim 2, characterized in that, It also comprises: S7. Set up a cement mortar conical slope (6) outside the built concrete brick mold (4).

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