Construction method of synchronous side wall of station board wall based on top-down excavation

Abstract

The application discloses a kind of based on cover excavation reverse construction station board wall synchronous side wall construction method, to solve the technical problem of serious leakage of prior art water.The construction method is: after excavation to small formwork bottom, pre-bury water-stop steel plate, pours cushion;Then the top plate and middle plate are constructed using small formwork, and the height of the small formwork is 1.5-2m;Preset concrete pouring hole on the top plate and middle plate, and preset vibrating hole on the side wall;After the upper and lower two side plates are completed, waterproof structure is constructed between the top plate, middle plate and side wall for waterproofing, then large steel formwork is used to pour concrete between the side wall and the side wall, and the vibrating hole is vibrated;After the side wall concrete is poured to the vibrating hole, the formwork is sealed in time, and the concrete is vibrated through the pouring hole, so that the side wall joint and the concrete in the pouring hole are dense. Water-stop steel plate and grouting pouring are combined to ensure the waterproof function of the side wall construction structure, and greatly improve the construction efficiency.

Description

Technical Field

[0001] This application relates to the field of station construction technology using the cut-and-cover method, specifically to a method for simultaneous construction of station slab walls and side walls based on the cut-and-cover method. Background Technology

[0002] Subway construction is generally located near urban areas. For situations with limited construction sites, high requirements for protecting surrounding structures, or difficulties in traffic management, the cut-and-cover method is often preferred. This method effectively protects surrounding buildings and underground pipelines, minimizing the environmental impact of construction. Key technologies in cut-and-cover construction include diaphragm wall and steel column construction techniques, formwork construction techniques in soft geological conditions, and sidewall reinforcement pre-reservation and waterproofing techniques. The quality of sidewall construction largely depends on the alignment and binding quality of the reinforcement. Station construction based on the cut-and-cover method is a method for constructing underground structures using cut-and-cover techniques. It often employs prefabricated bamboo plywood and wooden formwork. The prefabricated formwork is first supported by steel pipes and top supports, and then steel scaffolding is gradually installed.

[0003] However, existing construction techniques suffer from drawbacks such as long construction time, low material utilization, poor surface quality, and serious water leakage. Therefore, a highly efficient and quality-controllable method for simultaneous construction of station slab walls and side walls based on cut-and-cover reverse construction is needed.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the background technology of this disclosure and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] Through research, the inventors discovered that due to the limitations of existing construction methods, the construction of station side walls under the existing cut-and-cover reverse construction method has technical problems such as being time-consuming, labor-intensive, and prone to water leakage. By simultaneously constructing a waterproof structure during the construction of the top slab, middle slab, and side walls, the side wall structure can be made waterproof and the construction efficiency can be improved.

[0006] In view of at least one of the above technical problems, this disclosure provides a method for synchronous construction of station slab side walls based on cut-and-cover reverse construction. This method involves pre-setting concrete pouring holes in the top slab and / or middle slab, and pre-setting vibration holes in the side walls; constructing a waterproof structure between the top slab, middle slab, and side walls for waterproofing; after the upper and lower slabs are completed, large steel formwork is used in conjunction with overhead pumps and / or ground pumps to pour concrete for the side walls between the slabs, and vibration is performed through the vibration holes; the combination of waterproofing membrane and grouting ensures the waterproof function of the side wall construction structure and greatly improves construction efficiency.

[0007] According to one aspect of this disclosure, a method for simultaneous construction of station slab walls and side walls based on cut-and-cover reverse construction is provided, comprising the following steps: (1) After excavating to the bottom of the small formwork, pour the foundation layer; (2) The small formwork is used to construct the top slab and / or middle slab, and the height of the small formwork is 1.5-2m; (3) Concrete pouring holes are pre-set on the top slab and / or middle slab, and vibration holes are pre-set on the side walls; (4) After the upper and lower side panels are completed, a waterproof structure is constructed between the top panel, the middle panel and the side wall for waterproofing; (5) Large steel formwork is used in conjunction with overhead pumps and / or ground pumps to pour concrete for the side walls between the slabs, and the concrete is vibrated through the vibrating holes; (6) After the side wall concrete is poured to the vibrating hole, it should be sealed with a template in time, and the concrete should be vibrated through the pouring hole to make the side wall joint and the concrete in the pouring hole dense.

[0008] In some embodiments of this disclosure, in step (1), the thickness of the padding layer is 15-25 cm; Before constructing the foundation layer, water-stop steel plates are pre-embedded on both sides of the side wall to facilitate the construction of subsequent waterproof structures.

[0009] The thickness of the cushion layer should not be too thin to ensure that it has a certain supporting capacity. Preferably, the thickness of the cushion layer can be 20cm, and water-stop steel plates are pre-embedded on both sides of the side wall for further waterproofing of the side wall.

[0010] In some embodiments of this disclosure, during step (2), when constructing the top slab and the middle slab, a water-stop steel plate is pre-embedded to facilitate the subsequent construction of the waterproof structure.

[0011] Waterproofing measures are taken for the top and middle slab structures by pre-embedding water-stop steel plates, which facilitates the subsequent construction of waterproof structures.

[0012] In some embodiments of this disclosure, in step (3), the pouring hole is made of steel pipe or PVC pipe with a diameter of not less than 16cm; the vibration hole is a pre-reserved hole with a width and height of not less than 16cm and a depth of not less than 30cm; the spacing between the pouring holes is 150-200cm, the spacing between the vibration holes is 150-200cm, and the pouring hole and the vibration hole are on the same vertical plane.

[0013] The height and depth of the pre-drilled vibration holes can be adjusted according to the size of the vibrator and the thickness of the sidewall, but should not be too large. The vibrator has a certain working range, and the spacing between the vibration holes must ensure that the vibrator fully vibrates the concrete in every corner. Therefore, the spacing between the vibration holes should not be too large to prevent insufficient vibration.

[0014] In some embodiments of this disclosure, in step (4), the waterproof structure includes the water-stop steel plate and grouting pipe disposed at the joint between the middle plate, the top plate and the side wall, the cement-based penetrating crystalline waterproof material and the water-stop adhesive laid on the joint wall.

[0015] By combining the water-stop steel plate at the joint of the side wall with the grouting structure, waterproof materials, and water-stop adhesive, the waterproof performance of the construction structure can be improved, which can effectively avoid serious water leakage.

[0016] In some embodiments of this disclosure, the thickness of the cement-based penetrating crystalline waterproofing material is not less than 0.1 mm.

[0017] In some embodiments of this disclosure, during the concrete pouring process, an endoscope is installed in the internal structure through the pouring hole and the vibration hole to detect the internal pouring condition.

[0018] By using an endoscope to obtain timely information about the internal pouring process during construction, it is possible to respond promptly to unexpected situations and thus ensure the smooth progress of the sidewall construction.

[0019] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages: 1. This application uses a combination of pre-reserved vibration holes, pouring holes and water-stop steel plates to waterproof the side wall construction structure, thereby solving the technical problem of easy leakage at the construction joints of the side wall during the synchronous construction of the panel wall, and achieving the technical effect of structural waterproofing.

[0020] 2. This application improves the construction efficiency of simultaneous construction of panel walls by combining the reasonable reserved vibration holes and pouring holes with the construction process of the waterproof structure. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the construction of a small formwork in one embodiment of this application.

[0022] Figure 2 This is a schematic diagram of the subbase construction in one embodiment of this application.

[0023] Figure 3 This is a schematic diagram showing the distribution of casting holes and vibration holes in one embodiment of this application.

[0024] Figure 4 This is a schematic diagram of the waterproof structure in one embodiment of this application.

[0025] Figure 5 This is a schematic diagram of the pouring construction in one embodiment of this application.

[0026] In the above figures, 1 is the top slab, 2 is the bottom slab, 21 is the first intermediate slab, 22 is the second intermediate slab, 3 is the foundation layer, 4 is the water-stop steel plate, 5 is the pouring hole, 6 is the vibration hole, 7 is the water-stop adhesive, 8 is the grouting pipe, 9 is the cement-based penetrating crystallizing waterproof material, 10 is the side wall, 11 is the concrete transport vehicle, 12 is the concrete pump, and 13 is the working platform. Detailed Implementation

[0027] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," "vertical," "horizontal," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. The terms "first," "second," etc., used in this application are used to distinguish the described objects and do not have any sequential or technical meaning. And the terms "connection" and "linkage," unless otherwise specified, include both direct and indirect connections (linkages).

[0028] Unless otherwise specified, the unit modules, components, structures, mechanisms, and other devices involved in the following embodiments are all commercially available products.

[0029] This application provides a method for synchronous construction of station slab walls based on cut-and-cover reverse construction, which solves the technical problem of serious water leakage caused by the simple construction of waterproof structures in existing construction methods. By combining the water-stop steel plate with the concrete pouring structure, the waterproof performance of the side wall is greatly improved, and the water leakage problem is effectively solved.

[0030] The technical solution in this application embodiment is to solve the aforementioned technical problem of severe water leakage. The overall approach is as follows: After excavation to the bottom of the small formwork, a water-stop steel plate is pre-embedded, and a cushion layer is poured. The top and middle slabs are constructed using the small formwork, which is 1.5-2m high. Concrete pouring holes are pre-set on the top slab and / or the middle slab, and vibration holes are pre-set on the side walls. After the upper and lower side slabs are completed, a waterproof structure is constructed between the top slab, the middle slab, and the side walls for waterproofing. Then, a large steel formwork is used in conjunction with a boom pump and / or a ground pump to pour concrete for the side walls between the slabs, and vibration is performed through the vibration holes. After the side wall concrete is poured to the vibration holes, it is promptly sealed with formwork, and the concrete is vibrated through the pouring holes to ensure that the side wall joints are compacted with the concrete in the pouring holes.

[0031] The aforementioned waterproof structure includes a water-stop steel plate and grouting pipe installed at the joints between the middle slab, top slab, and side walls, as well as a cement-based penetrating crystalline waterproof material and water-stop adhesive applied to the joint walls. By combining the water-stop steel plate with the concrete grouting structure and water-stop adhesive in the waterproof structure, the waterproofing effect is further improved, thereby effectively solving the technical problem of severe water leakage in existing side wall construction.

[0032] To better understand the technical solution of this application, the above technical solution will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Example 1 This example discloses a method for simultaneous construction of station slab walls and side walls based on cut-and-cover reverse construction, as shown in the figure. The main steps are as follows: (1) After excavating to the bottom of the small formwork, a galvanized waterstop steel plate 4 is pre-embedded, and a 20cm cushion layer 3 is poured, as follows. Figure 2 As shown, a galvanized waterstop steel plate 4 is pre-embedded before the subbase 3 is applied to improve the waterstop effect.

[0034] (2) For example Figure 1 As shown, small formwork is used to construct the top slab 1 and the middle slab. The height of the small formwork is 1.5-2m. Using small formwork allows for the pre-reservation of pouring holes 5 and vibration holes 6 to prepare for the subsequent construction of the side wall 10 concrete vibration. In addition, the formwork has a high reuse rate, and the small formwork can be reused. Before the next excavation, the formwork is cleaned in advance.

[0035] (3) such as Figure 3 As shown, concrete pouring holes 5 are pre-set on the top slab 1 and / or the middle slab, and vibration holes 6 are pre-set on the side wall 10. For example, the pouring holes 5 are made of steel pipe or PVC pipe with a diameter of not less than 16cm, and the vibration holes are pre-reserved holes with a size of not less than 16 (width) × 16 (height) × 30 (depth) cm. In actual construction, those skilled in the art can choose according to the actual situation. Preferably, the pouring holes 5 and vibration holes 6 must be on the same vertical plane. The spacing between the pouring holes 5 is 150-200cm, and the spacing between the vibration holes 6 is 150-200cm. In actual construction, those skilled in the art can choose according to the actual situation, mainly based on the working radius of the vibrator, to ensure that the concrete of the side wall 10 can be vibrated. Preferably, the spacing of the vibration holes 6 is 150cm.

[0036] (4) A waterproof structure is constructed between the top slab 1, the middle slab, and the side wall 10 for waterproofing; such as Figure 4As shown, the waterproof structure includes a water-stop steel plate 4 and a grouting pipe 8 installed at the joint between the middle plate, top plate 1, and side wall 10; a cement-based penetrating crystalline waterproof material 9 and a water-stop adhesive 7 laid on the joint wall. The thickness of the cement-based penetrating crystalline waterproof material 9 is not less than 0.1 mm. By utilizing the water-stop steel plate 4 in conjunction with the concrete structure, waterproof material, and water-stop adhesive 7, the waterproofing effect of the side wall 10 construction structure is further improved, effectively solving the technical problem of severe water leakage in existing construction structures.

[0037] (5) After the upper and lower side panels are completed, a large steel formwork is used in conjunction with an overhead pump and / or a ground pump to pour concrete for the side walls 10 between the panels, and vibration is performed through the vibration holes 6. In the specific construction process, an overhead pump is used when pouring the side walls 10 of the first basement level, and a ground pump is used when pouring the side walls 10 of the second and third basement levels, thereby improving construction efficiency; Figure 5 As shown, concrete is transported to the pouring location by concrete truck 11, and poured through pouring hole 5 by concrete pump 12. During the pouring process, construction workers assist in pouring on working platform 13 to improve pouring efficiency. Working platform 13 is distributed between top slab 1 and middle slab 21 and middle slab 22 respectively.

[0038] (6) After the concrete of the side wall 10 is poured to the vibrating hole 6, it is sealed with a template in time, and the concrete is vibrated through the pouring hole 5 to make the joint of the side wall 10 and the concrete in the pouring hole 5 dense. During the concrete pouring process, an endoscope is installed in the internal structure through the pouring hole 5 and the vibrating hole 6 to check the internal pouring status.

[0039] Although some preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0040] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the inventive spirit and scope of this application. Therefore, if such modifications and variations to this application fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A method for simultaneous construction of station slab walls and side walls based on cut-and-cover reverse construction, characterized in that, Includes the following steps: (1) After excavating to the bottom of the small formwork, pour the cushion layer; before constructing the cushion layer, pre-embed the corresponding water-stop steel plate; (2) The small formwork is used to construct the top slab and / or middle slab, and the height of the small formwork is 1.5-2m; (3) Concrete pouring holes are pre-set on the top slab and / or middle slab, and vibration holes are pre-set on the side walls; the concrete pouring holes and the vibration holes are respectively located on both sides of the waterstop steel plate; the pouring holes are made of steel pipe or PVC pipe with a diameter of not less than 16cm; the vibration holes are reserved holes with a width and height of not less than 16cm and a depth of not less than 30cm; the spacing between the pouring holes is 150-200cm, the spacing between the vibration holes is 150-200cm, and the pouring holes and vibration holes are on the same vertical plane; (4) After the upper and lower side panels are completed, a waterproof structure is constructed between the top panel, the middle panel and the side wall for waterproofing; the waterproof structure includes the water-stop steel plate and grouting pipe set at the joint between the middle panel, the top panel and the side wall, the cement-based penetrating crystalline waterproof material and the water-stop adhesive laid on the joint wall. (5) Large steel formwork is used in conjunction with overhead pumps and / or ground pumps to pour concrete for the side walls between the slabs, and the concrete is vibrated through the vibration holes; the concrete is transported to the pouring location by concrete trucks, and poured through the pouring holes using concrete pumps. During the pouring process, construction workers assist in the pouring on the work platforms, which are respectively distributed between the top slab and the first middle slab and between the first middle slab and the second middle slab. (6) During the pouring process, an endoscope is installed in the internal structure through the pouring hole and the vibration hole to detect the internal pouring condition; (7) After the side wall concrete is poured to the vibrating hole, it should be sealed with a template in time, and the concrete should be vibrated through the pouring hole to make the side wall joint and the concrete in the pouring hole dense.

2. The method for simultaneous construction of station slab walls and side walls according to claim 1, characterized in that, In step (1), the thickness of the cushion layer is 15-25cm; and before constructing the cushion layer, water-stop steel plates are pre-embedded on both sides of the side wall to facilitate the construction of the subsequent waterproof structure.

3. The method for simultaneous construction of station slab walls and side walls according to claim 1, characterized in that, In step (2), when constructing the top slab and the middle slab, a water-stop steel plate is pre-embedded to facilitate the subsequent construction of the waterproof structure.

4. The method for simultaneous construction of station slab walls and side walls according to claim 1, characterized in that, The thickness of the cement-based penetrating crystalline waterproofing material is not less than 0.1 mm.

Images