Construction method of full-precast assembly side wall portal for underground structure

Abstract

The application discloses a construction method of full-precast assembly side wall door for underground structure, which comprises the following steps: 1, pouring the lower frame beam and reserving the lower groove; 2, setting the rubber waterstop in the lower groove and clamping all the temporary walls of the precast plates; 3, sequentially setting the rubber waterstop and the steel formwork for pouring the upper frame beam at the upper end of all the temporary walls of the precast plates; 4, tightening the gap between the steel formwork and the corresponding temporary wall of the precast plate by the pre-pressing bolt to press the corresponding rubber waterstop; 5, pouring the two side wall columns and the upper frame beam; 6, setting the steel plate which is connected with the corresponding temporary wall of the precast plate, covers the height of the corresponding temporary wall of the precast plate and extends along the width direction of the door frame structure; 7, filling the corresponding gap position with butter; 8, after the excavation of the foundation pit is completed, all the temporary walls of the precast plates are removed and recycled. The application realizes the chiseling-free and convenient dismounting of the side wall door of the underground structure and makes up for the defects of the prior art.

Description

Technical Field

[0001] This invention relates to the field of underground structure construction technology, and in particular to a construction method for a fully prefabricated assembly side wall portal in an underground structure. Background Technology

[0002] In the design and construction of underground spaces, the reserved openings in the side walls are a common engineering problem. In particular, with the support of various construction methods such as open excavation, reverse construction, caisson construction, and fully prefabricated assembly, the forms of reserved openings in the side walls have become increasingly diverse.

[0003] Based on whether or not there is an enclosing structure, side wall openings are mainly divided into the following two categories:

[0004] The first category consists of enclosing structures, and the portal can, in principle, directly adopt a beam-column frame system.

[0005] The second type is without an enclosure structure. During the construction phase, the side walls of the opening need to be retained. This type of opening is usually designed with steel sealing doors or cast-in-place reinforced concrete walls.

[0006] Among them, the second type of unenclosed structure has problems such as high cost and waste of steel when using steel-sealed doors, while using cast-in-place reinforced concrete walls will also result in a huge amount of abandoned projects.

[0007] Therefore, how to solve the problem of high cost and excessive waste of raw materials in the side wall openings of the second type of unenclosed structure has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0008] In view of the above-mentioned deficiencies of the prior art, the present invention provides a construction method for a fully prefabricated assembly side wall portal for underground structures, the purpose of which is to enable the side wall portal of underground structures to be disassembled without chiseling and to overcome the deficiencies of the prior art.

[0009] To achieve the above objectives, the present invention discloses a construction method for a fully prefabricated assembly side wall opening for underground structures, wherein the side wall of the underground structure is provided with a door frame structure including an upper frame beam, a lower frame beam and two side wall columns at the opening location.

[0010] The door frame structure includes two or more prefabricated temporary wall panels along the horizontal direction, comprising the following steps:

[0011] Step 1: Cast the lower frame beam and reserve the lower groove for snapping together all the precast temporary walls;

[0012] Step 2: Install rubber waterstops in the lower grooves and insert them into all the precast slab temporary walls. The weight of the precast slab temporary walls will press the corresponding rubber waterstops in the lower grooves tightly.

[0013] Step 3: Install the rubber waterstop and the steel formwork for casting the upper frame beam sequentially at the top of all the precast temporary walls;

[0014] Step 4: Tighten the gap between the steel template and the corresponding precast temporary wall by using pre-pressing bolts to press the corresponding rubber waterstop.

[0015] Step 5: Cast the wall columns on both sides and the upper frame beam;

[0016] Step 6: A steel plate is provided at the gap between each of the precast slab temporary walls and the adjacent precast slab temporary walls, and at the gap between each of the wall columns and the adjacent precast slab temporary walls.

[0017] Each of the steel plates is connected to the corresponding precast temporary wall, covers the height of the corresponding precast temporary wall, and extends along the width of the door frame structure;

[0018] Step 7: Apply grease to both sides of each steel plate to fill the corresponding gaps;

[0019] Step 8: After the foundation pit excavation is completed, remove and reclaim all the precast temporary walls.

[0020] Preferably, the underground structure is constructed using the open-cut method or the caisson method.

[0021] Preferably, in step 1, multiple steel brackets for the lower frame beam are provided above the lower frame beam and above the side wall of the lower groove near the inner side of the underground structure.

[0022] Each of the steel corbels of the lower frame beam is fixedly connected to the lower frame beam, and the bearing surface of each corbel is in close contact with the side of the corresponding precast temporary wall facing the inside of the underground structure.

[0023] In step 8, all the steel brackets of the lower frame beams are recycled.

[0024] Preferably, each of the precast temporary walls is a lightweight precast panel, specifically a rectangular panel or a double T-shaped panel.

[0025] Preferably, the installation error of each of the steel plates at the corresponding gap position is between 2 mm and 5 mm.

[0026] Preferably, both the lower surface of the upper frame beam and the lower surface of the steel formwork are provided with upper grooves for engaging all the precast temporary wall panels.

[0027] More preferably, below the upper frame beam, near the lower side wall of the inner side of the underground structure, a plurality of upper frame beam steel brackets are provided;

[0028] Each of the steel corbels of the upper frame beam is fixedly connected to the upper frame beam, and the bearing surface is in close contact with the side of the corresponding precast temporary wall facing the inside of the underground structure;

[0029] In step 8, all the steel brackets of the upper frame beam are recycled.

[0030] The beneficial effects of this invention are:

[0031] This invention uses a prefabrication and assembly method to achieve the elimination of chiseling and easy disassembly of the side wall openings of underground structures, which has better economic and social benefits;

[0032] This invention possesses both reliable lateral load-bearing capacity and good water tightness.

[0033] In this invention, the precast temporary walls, steel plates, steel brackets, steel formwork, etc. can all be recycled and reused. Temporary components do not need to be removed, and precast components are easy to disassemble, which is in line with the green and economical industry trend.

[0034] In this invention, precast temporary walls and steel brackets can be produced in a standardized and large-scale manner, reducing on-site formwork, concrete pouring and curing operations, and achieving a high level of mechanization.

[0035] The following will further explain the concept, specific structure, and technical effects of the present invention in conjunction with the accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Attached Figure Description

[0036] Figure 1 This diagram shows a structural schematic of an underground structure after the butter has been applied, with the structure facing both the inside and outside.

[0037] Figure 2 This diagram shows a cross-sectional view of the connection structure between the precast temporary wall and the upper and lower frame beams in one embodiment of the present invention.

[0038] Figure 3 This diagram illustrates how, in one embodiment of the present invention, the gap between the steel template and the corresponding precast temporary wall is tightened by pre-pressing bolts.

[0039] Figure 4 This diagram illustrates a facade structure in one embodiment of the present invention, in which a steel plate is installed at the gap between a precast temporary wall and a pilaster and coated with grease.

[0040] Figure 5 This diagram shows a cross-sectional view of a precast temporary wall and a pilaster in one embodiment of the present invention, in which a steel plate is placed in the gap between the precast temporary wall and the pilaster and grease is applied.

[0041] Figure 6 This diagram shows a cross-sectional view of a steel plate and grease applied between two adjacent precast slab temporary walls in one embodiment of the present invention. Detailed Implementation

[0042] Example: Figures 1 to 6 As shown, the construction method for a fully prefabricated assembly side wall portal for an underground structure is described. The portal location in the side wall of the underground structure is provided with a door frame structure including an upper frame beam 1, a lower frame beam 2, and two side wall columns 6.

[0043] The door frame structure includes two or more precast temporary wall panels 3 arranged horizontally within its interior; the steps include:

[0044] Step 1: Cast the lower frame beam 2 and reserve the lower groove for snapping together all the precast temporary walls 3;

[0045] Step 2: Install rubber waterstops 8 in the lower grooves, insert them into all the precast temporary wall 3, and use the weight of the precast temporary wall 3 to press the corresponding rubber waterstops 8 in the lower grooves.

[0046] Step 3: Install rubber waterstops 8 and steel formwork 9 for pouring the upper frame beam 1 sequentially on the upper end of all precast temporary wall 3.

[0047] Step 4: Tighten the gap between the steel template 9 and the corresponding precast temporary wall 3 by using the pre-pressing bolts 10 to press the corresponding rubber waterstop 8.

[0048] Step 5: Cast the two side wall columns 6 and the upper frame beam 1;

[0049] Step 6: Steel plates 11 are provided at the gap between each precast temporary wall 3 and the adjacent precast temporary wall 3, and at the gap between each wall column 6 and the adjacent precast temporary wall 3.

[0050] Each steel plate 11 is connected to the corresponding precast temporary wall 3, covers the height of the corresponding precast temporary wall 3, and extends along the width direction of the door frame structure;

[0051] Step 7: Apply grease 7 to both sides of each steel plate 11 to fill the corresponding gaps;

[0052] Step 8: After the foundation pit excavation is completed, remove and reclaim all precast temporary wall panels 3.

[0053] The precast temporary wall 3 at the entrance of this patent is a temporary component, which is fixed by the door frame structure formed by the upper frame beam 1, the lower frame beam 2 and the side wall columns 6.

[0054] The top and bottom of the precast temporary wall 3 are connected to the upper frame beam 1 and the lower frame beam 2 through upper slots, lower slots and rubber waterstops 8 to achieve snap-fit ​​and waterproofing;

[0055] The gaps between each precast temporary wall 3 and the wall column 6, as well as the gap between the adjacent precast temporary wall 3, are filled by setting steel plates 11 and applying grease 7, thereby assembling them into temporary portal side walls with lateral bearing capacity and water tightness.

[0056] In the early stages of construction, the side wall of the portal bears water and soil pressure. After the two sides of the portal wall are open, all the precast temporary wall 3 is removed and recycled, and the portal is naturally formed.

[0057] In some embodiments, underground structures are constructed using open-cut excavation or caisson construction.

[0058] In some embodiments, in step 1, multiple steel brackets 4 for the lower frame beam are provided above the lower groove near the side wall of the inner side of the underground structure on the upper part of the lower frame beam 2.

[0059] Each lower frame beam steel bracket 4 is fixedly connected to the lower frame beam 2, and the bearing surface is tightly attached to the side of the corresponding precast temporary wall 3 facing the inside of the underground structure.

[0060] In step 8, all the steel brackets 4 of the lower frame beams are recycled.

[0061] In some embodiments, each precast temporary wall 3 is a lightweight precast slab, specifically a rectangular slab or a double T-shaped slab.

[0062] In some embodiments, the installation error of each steel plate 11 at the corresponding gap position is between 2 mm and 5 mm.

[0063] In some embodiments, the underside of the upper frame beam 1 and the underside of the steel formwork 9 are provided with upper grooves for engaging all the precast temporary wall 3 panels.

[0064] In some embodiments, multiple steel brackets 5 for the upper frame beam are provided below the upper frame beam 1, near the side wall of the inner side of the underground structure.

[0065] Each upper frame beam steel bracket 5 is fixedly connected to the upper frame beam 1, and the bearing surface is tightly attached to the side of the corresponding precast temporary wall 3 facing the inside of the underground structure.

[0066] In step 8, all the steel brackets 5 of the upper frame beams are recycled.

[0067] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A construction method for a fully prefabricated assembled side wall portal of an underground structure, the portal position of the side wall of the underground structure is provided with a portal frame structure comprising an upper frame beam (1), a lower frame beam (2) and two side wall columns (6); characterized in that, The door frame structure is provided with two or more than two prefabricated plate temporary walls (3) in the horizontal direction; comprising the following steps: Step 1, pouring the lower frame beam (2) and reserving the lower groove for clamping all the prefabricated plate temporary walls (3); Step 2, setting the rubber water stop belt (8) in the lower groove, clamping all the prefabricated plate temporary walls (3), and pressing the rubber water stop belt (8) in the corresponding lower groove by the weight of the prefabricated plate temporary walls (3); Step 3, sequentially setting the rubber water stop belt (8) and the steel formwork (9) for pouring the upper frame beam (1) at the upper end of all the prefabricated plate temporary walls (3); Step 4, tightening the gap between the steel formwork (9) and the corresponding prefabricated plate temporary walls (3) by the pre-pressing bolt (10) to press the corresponding rubber water stop belt (8); Step 5, pouring the side wall column (6) and the upper frame beam (1); Step 6, setting the steel plate (11) at the gap position between each prefabricated plate temporary wall (3) and the adjacent prefabricated plate temporary wall (3), and the gap position between each wall column (6) and the adjacent prefabricated plate temporary wall (3); Each steel plate (11) is connected with the corresponding prefabricated plate temporary wall (3), covers the height of the corresponding prefabricated plate temporary wall (3), and extends along the width direction of the door frame structure; Step 7, smearing butter (7) on both sides of each steel plate (11) to fill the corresponding gap position; Step 8, after the excavation of the foundation pit is completed, all the prefabricated plate temporary walls (3) are removed and recycled.

2. The construction method of full-precast assembly side wall portal for underground structure according to claim 1, characterized in that, The underground structure is constructed by the open excavation method or the sinking well method.

3. The construction method of full-precast assembly side wall portal for underground structure according to claim 1, characterized in that, In step 1, on the upper surface of the lower frame beam (2), the lower groove is arranged above the side wall close to the inner side of the underground structure, and a plurality of lower frame beam steel brackets (4) are arranged; Each lower frame beam steel bracket (4) is fixedly connected with the lower frame beam (2), and the bearing surface is tightly attached to the side of the corresponding prefabricated plate temporary wall (3) facing the inner side of the underground structure; In step 8, all the lower frame beam steel brackets (4) are recycled.

4. The construction method of full-precast assembly side wall portal for underground structure according to claim 1, characterized in that, Each prefabricated plate temporary wall (3) is a lightweight prefabricated plate, specifically a rectangular plate or a double T-shaped plate.

5. The construction method of full-precast assembly side wall portal for underground structures as claimed in claim 1 wherein, The installation error of each steel plate (11) at the corresponding gap position is 2mm to 5mm.

6. The construction method of full-precast assembly side wall portal for underground structures as claimed in claim 1 wherein, The lower surface of the upper frame beam (1) and the lower surface of the steel formwork (9) are provided with upper grooves for clamping all the prefabricated plate temporary walls (3).

7. The construction method of full-precast assembly side wall portal for underground structures according to claim 6, characterized in that, On the lower surface of the upper frame beam (1), the upper groove is arranged below the side wall close to the inner side of the underground structure, and a plurality of upper frame beam steel brackets (5) are arranged; Each upper frame beam steel bracket (5) is fixedly connected with the upper frame beam (1), and the bearing surface is tightly attached to the side of the corresponding prefabricated plate temporary wall (3) facing the inner side of the underground structure; In step 8, all the upper frame beam steel brackets (5) are recycled.

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