Construction method of rectangular multifunctional rainwater pumping station with ultra-deep sections along the lake

Abstract

The present invention relates to a construction method for making a rectangular multifunctional rainwater pump station in ultra-deep sections along a lake, comprising the steps of excavating an initial foundation pit, constructing an external anchoring system, installing a template and preliminarily fixing it, installing a second safety net, installing a template tensioning screw, installing a template back rib, installing a template support system, installing a first safety net, installing a diagonal brace, pouring a caisson segment, and excavating a foundation pit. The beneficial effects of the present invention are: using a cantilever template system to make a rainwater pump station caisson segment, without relying on traditional floor brackets as template protection, through a bottom embedded part erection system, a top tensioning system, a support system, a back rib system, an external anchoring system, a double safety net protection system and other multiple template reinforcement and protection systems to achieve a stable template, a simple support structure, and easy assembly and disassembly of components.

Description

Technical Field

[0001] The invention belongs to the technical field of rainwater pump station construction, and in particular relates to a construction method for a super-deep segmented rectangular multifunctional rainwater pump station along a lake, which is suitable for municipal engineering, water conservancy and other projects. Background Art

[0002] When constructing a large-scale rainwater pump station using the caisson method, a construction method of segmented production and segmented sinking is generally adopted, that is, scaffolding and support structures are set up on the surface around the well, and the template is installed using the scaffolding platform and support structure. Then, the rainwater pump station segments are cast in segments and the segments are sunk in sequence. In this construction system, the scaffolding and support system needs to be set up on the ground, and the foundation strength requirements are relatively high. However, soft soil areas are widely distributed in the lakeside area, and the cost of soil reinforcement and foundation treatment is relatively high. If the ground-based scaffolding and support are not used, and the cantilever system is used for construction, the cantilever system in the existing construction project cannot be directly applied to the construction of large-scale pump stations. Therefore, it is necessary to seek a cantilever system suitable for the construction of ultra-deep rectangular multifunctional rainwater pump stations along the lake to meet the requirements of segmented production of rainwater pump stations. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a construction method for a rectangular multifunctional rainwater pump station made in ultra-deep sections along a lake.

[0004] This method for constructing a super-deep rectangular multifunctional rainwater pump station along the lake comprises the following steps:

[0005] Step 1: excavate the initial foundation pit, make caissons in sections within the foundation pit area, and construct an external anchoring system around the outside of the foundation pit to form a concrete pier;

[0006] Step 2: Install the templates on both sides of the top of the completed segment through the bottom anchoring system. The templates on the outermost wall of the caisson are the outer templates, and install the second safety net between the templates of adjacent caisson walls;

[0007] Step 3: Install the top tension screws on the top of the template at the top of the same completed segment; set up shelf grooves in the longitudinal and transverse directions on the outside of the template, and use several shelf grooves on each layer in the transverse direction to install the back ribs; set up support rods between the templates at the top of adjacent completed segments;

[0008] Step 4: Install the diagonal brace using the external anchoring system, with the diagonal brace supported between the outer formwork and the concrete pier;

[0009] Step 5: Pour concrete of the section to be poured to form a new completed section, excavate the foundation pit to the depth of the corresponding completed section, clear the working surface for the construction of the next section to be poured, and recycle the completed sections in sequence to construct the next section to be poured.

[0010] Preferably, in step one, the external anchoring system includes several units, and the units of the external anchoring system include a solidification zone. A solidification zone of a certain depth is constructed below the ground, and steel pipe piles are driven in the center of the solidification zone. The top of the steel pipe pile is flush with the top of the solidification zone, and fine sand is poured into the steel pipe piles. At the same time, anchor bars are installed in the solidification zone, and the top of the anchor bars extends out of the solidification zone, and an anchor steel plate is arranged on the top of the anchor bars. The extended anchor bars and the anchor steel plate are used as a skeleton to cast and form a concrete pier.

[0011] Preferably, in step two, the top of the completed segment is provided with embedded steel plates and embedded screws, the embedded steel plates and embedded screws include at least two layers, the upper embedded screws are used to install the cross bar, and the end of the upper cross bar and the end of the lower embedded screw are connected with an inclined rod by a fastening bolt; the embedded screws are used as a fixed fulcrum to hang the second safety net, and the second safety net is hung between the walls of adjacent caissons in different areas.

[0012] Preferably, in step three, the top of the formwork is provided with connecting plates arranged at horizontal intervals, and the top tie rods are passed through the connecting rods relative to the formwork and the anchor bolts are installed; shelf grooves are provided on the outside of the formwork in the longitudinal and transverse directions, and the back ribs are installed using several shelf grooves in each layer in the transverse direction; in step five, the top height of the concrete pouring is below the top tie rods.

[0013] Preferably, in step three, the shelf grooves and back ribs are arranged on the outer template.

[0014] Preferably, in step three, an anchor block is provided on the outside of the formwork, and the anchor block on the outside of the formwork is used to install the brace rods, and the multiple layers of brace rods are installed between the outer formworks of adjacent caisson walls; the lower end of the anchor block is used as a fixed fulcrum, and the first safety net is installed and hung on the fixed fulcrum through connecting bolts, and the first safety net is hung in different areas between the adjacent walls of the caisson, and the first safety net and the second safety net together constitute a fall prevention system.

[0015] Preferably, in step three, the diagonal brace includes a first diagonal brace, a second diagonal brace and a third diagonal brace, the bottoms of the first diagonal brace and the second diagonal brace are provided with concrete piers, and the third diagonal brace is fixed to the inner side of the concrete pier.

[0016] The beneficial effects of the present invention are:

[0017] 1) The present application utilizes a cantilever formwork system to produce rainwater pump station caisson segments, and does not rely on traditional floor-standing supports as formwork protection. The formwork reinforcement and protection system of the present application implements an external anchoring system around the outside of the foundation pit to form a concrete pier; top tensioning screws are installed on the top of the formwork; multi-layer bracing rods are installed between the outer formworks of adjacent caisson walls using anchor blocks on the outside of the formwork; diagonal braces are supported between the outer formwork and the concrete pier; multiple stabilization of the formwork is achieved, and the structural system is simple, and most components can be easily assembled and disassembled.

[0018] 2) This application utilizes the completed section of the rainwater pump station caisson to cantilever and install the formwork for the next section of the caisson, thereby achieving rapid and stable erection of the formwork.

[0019] 3) The present application utilizes the top tie rod relative to the template but does not cast it into the main structure of the caisson. The top height of the concrete pouring is below the top tie rod, thereby reducing the influence of the tie structure on the quality of the caisson structure.

[0020] 4) This application installs the back rib through the shelf groove on the outside of the template, which is easy to install.

[0021] 5) This application uses an external anchoring system to install diagonal braces to support the formwork, reducing the risk of the formwork tipping over.

[0022] 6) The existing formwork reinforcement components of the present application are equipped with a first safety net and a second safety net, which together form a foundation pit anti-fall system, and the safety nets can be installed and removed at any time. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a cross-sectional view of the caisson construction of a rainwater pump station of the present invention;

[0024] Figure 2 This is a plan view of the construction of the caisson of the rainwater pump station of the present invention;

[0025] Figure 3 This is a detailed drawing of the external anchoring system;

[0026] Figure 4 This is the detail drawing of the template support system;

[0027] Figure 5 Detailed drawing of the system for setting up the bottom of the formwork;

[0028] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0029] 1-foundation pit; 2-completed section; 3-section to be poured; 4-formwork; 5-external formwork; 6-external straight formwork; 7-external angle formwork; 8-embedded steel plate; 9-embedded screw rod; 10-cross bar; 11-diagonal bar; 12-fastening bolt; 13-external anchoring system; 14-ground; 15-curing area; 16-steel pipe pile; 17-fine sand; 18-anchoring bar; 19-anchoring steel plate; 20-concrete pier; 21 -First diagonal brace; 22-Second diagonal brace; 23-Third diagonal brace; 24-Connecting plate; 25-Top tension rod; 26-Anchor bolt; 27-Shelving groove; 28-Back rib; 29-Anchor block; 30-Strut rod; 31-Connecting bolt; 32-First safety net; 33-Second safety net; 34-Main structure; 35-Formwork support system; 36-Top tension system; 37-Bottom anchoring system; 38-Diagonal brace. DETAILED DESCRIPTION

[0030] The present invention is further described below in conjunction with embodiments. The description of the following embodiments is only used to help understand the present invention. It should be noted that for ordinary persons in the art, without departing from the principle of the present invention, the present invention can also be modified in some ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0031] As an example, Figures 1 to 5 As shown in the figure, the construction method of making a rectangular multifunctional rainwater pump station in ultra-deep sections along the lake includes the following steps:

[0032] Step 1, excavation of initial foundation pit 1: excavation of initial foundation pit 1 in the area where the rainwater pump station is to be constructed, the rainwater pump station is constructed by caisson method, the foundation pit 1 is excavated from the existing surface to the starting elevation, and caissons are made in sections in the foundation pit 1 area to lower the construction working surface.

[0033] Construction of external anchoring system 13: An external anchoring system 13 is constructed at intervals outside the foundation pit 1 and around the rainwater pump station to be constructed. Each unit of the external anchoring system 13 includes: a certain depth of solidification area 15 is constructed in the shallow layer below the ground 14 by cement solidification, and a deep steel pipe pile 16 is driven in the center of the solidification area 15. The top of the steel pipe pile 16 is flush with the top elevation of the solidification area 15, and fine sand 17 is poured into the steel pipe pile 16. At the same time, anchoring bars 18 are installed in the solidification area 15, and the top of the anchoring bars 18 protrudes from the solidification area 15. Anchoring steel plates 19 are set on the top of the anchoring bars 18. Using the protruding anchoring bars 18 and anchoring steel plates 19 as a skeleton, a wedge-shaped concrete pier 20 is cast.

[0034] Step 2, install the template 4 and fix it preliminarily: install the template 4 through the bottom anchoring system 37, that is, use the completed section 2 of the rainwater pump station caisson to install the next section caisson template 4, and clamp the two side templates 4 of the caisson on the top of the completed section 2. The top of the completed section 2 is provided with embedded steel plates 8 and embedded screws 9, and the embedded steel plates 8 and embedded screws 9 include at least two layers. The upper embedded screws 9 are used to install the crossbars 10, and the ends of the upper crossbars 10 and the lower embedded screws 9 are connected with the inclined rods 11. The rod connections are all provided with fastening bolts 12. The outer template 5 is composed of a straight outer straight template 6 and an L-shaped outer angle template 7.

[0035] The formwork 4 on the outermost wall of the caisson is the outer formwork 5, and a second safety net 33 is installed between the formworks 4 of adjacent caisson walls: when the formwork 4 is initially installed, the embedded screw 9 is used as a fixed fulcrum to hang the second safety net 33. The second safety net 33 is hung in different areas between adjacent walls of the caisson to prevent high falls in the foundation pit 1.

[0036] Step 3, install the tension screws of the template 4: install the tension screws using the connecting plate 24 at the top of the template 4. Different from the conventional tension structure, the top of the template 4 of the present application has a connecting plate 24 arranged horizontally at intervals, and the top tension rod 25 is penetrated by the connecting rod 24 relative to the template 4 and the anchor bolt 26 is installed. The top tension rod 25 is not cast into the main structure 34 of the caisson, reducing the influence of the tension structure on the quality of the caisson structure.

[0037] Install the back rib 28 of the template 4: Shelf grooves 27 are arranged at intervals in the longitudinal and transverse directions on the outside of the template 4, and the back rib 28 is installed using a plurality of transverse shelf grooves 27. For ease of installation, the shelf grooves 27 and the back rib 28 are only arranged on the outer template 5 of the outermost wall of the caisson.

[0038] Install the template support system 35: use the anchor block 29 on the outside of the template 4 to install the support rod 30, the support rod 30 is installed between the outer templates 4 of the adjacent caisson walls, and the support rod 30 can be arranged in multiple layers.

[0039] Install the first safety net 32: Use the lower end seat of the anchor block 29 to fix the fulcrum, and install and hang the first safety net 32 ​​through the connecting bolts 31. The first safety net 32 ​​is hung between the adjacent walls of the caisson in different areas, and together with the second safety net 33, it forms an anti-fall system.

[0040] Step 4: Install the diagonal brace 38: Use the external anchoring system 13 to install the diagonal brace 38, which is supported on the outer formwork 4 of the outermost wall of the caisson. The diagonal brace 38 includes a first diagonal brace 21, a second diagonal brace 22, and a third diagonal brace 23. The bottoms of the first diagonal brace 21 and the second diagonal brace 22 are fixed to the top of the concrete pier 20, and the third diagonal brace 23 is fixed to the inner side of the concrete pier 20.

[0041] Step 5: Casting caisson segments and excavating foundation pit 1: The template 4 and its support system for the segment 3 to be cast are formed by the above structure, the caisson concrete is cast, and the completed segment 2 is recycled in sequence to construct the next segment.

[0042] After each section of the caisson is completed, the foundation pit 1 is excavated to the depth of the completed section 2 to clear the working surface for the construction of the next section 3 to be cast, and the completed section 2 is recycled in sequence to construct the next section 3 to be cast.

Claims

1. A construction method for making a rectangular multifunctional rainwater pump station in ultra-deep sections along a lake, characterized in that: The steps include: Step 1: excavate an initial foundation pit (1), make caissons in sections in the area of ​​the foundation pit (1), construct an external anchoring system (13) around the outer side of the foundation pit (1), and form a concrete pier (20); the external anchoring system (13) includes a plurality of units, and the units of the external anchoring system (13) include a solidification zone (15), a solidification zone (15) of a certain depth is constructed below the ground (14), and a steel pipe pile (16) is driven in the center of the solidification zone (15), the top of the steel pipe pile (16) is flush with the top of the solidification zone (15), and fine sand (17) is poured into the steel pipe pile (16); at the same time, an anchoring bar (18) is installed in the solidification zone (15), the top of the anchoring bar (18) protrudes out of the solidification zone (15), and an anchoring steel plate (19) is arranged on the top of the anchoring bar (18); the protruding anchoring bar (18) and the anchoring steel plate (19) are used as a skeleton to cast and form a concrete pier (20); Step 2: Install templates (4) on both sides of the top of the completed segment (2) through the bottom anchoring system (37), the template (4) on the outermost wall of the caisson is the outer template (5), and install the second safety net (33) between the templates (4) of the adjacent caisson walls; the top of the completed segment (2) is provided with embedded steel plates (8) and embedded screws (9), the embedded steel plates (8) and embedded screws (9) include at least two layers, the upper embedded screws (9) are used to install the cross bars (10), and the ends of the upper cross bars (10) and the lower embedded screws (9) are connected with inclined bars (11) through fastening bolts (12); the embedded screws (9) are used as fixed fulcrums to hang the second safety net (33), and the second safety net (33) is hung between the walls of adjacent caissons in different areas; Step 3: Install a top tie rod (25) on the top of the template (4) at the top of the same completed segment (2); provide shelf grooves (27) in the longitudinal and transverse directions on the outer side of the template (4), and use a plurality of shelf grooves (27) on each layer in the transverse direction to install back ribs (28); and provide a pair of support rods (30) between the templates (4) at the top of adjacent completed segments (2); Step 4: Install the diagonal brace (38) using the external anchoring system (13), wherein the diagonal brace (38) is supported between the outer formwork (5) and the concrete pier (20); Step 5: pour concrete of the section to be poured (3) to form a new completed section (2), excavate the foundation pit (1) to the depth of the corresponding completed section (2), clear the working surface for the construction of the next section to be poured (3), and recycle the completed section (2) to construct the next section to be poured (3).

2. The method for constructing a super-deep rectangular multifunctional rainwater pump station along the lake according to claim 1 is characterized in that: In step three, the top of the formwork (4) is provided with a connecting plate (24) arranged at a horizontal interval, and the top tie rod (25) is passed through the connecting plate (24) relative to the formwork (4) and the anchor bolts (26) are installed; a shelf groove (27) is provided on the outer side of the formwork (4) in the longitudinal and transverse directions, and the back ribs (28) are installed using a plurality of shelf grooves (27) in each transverse layer. In step five, the top height of the concrete pouring is below the top tie rod (25).

3. The method for constructing a super-deep rectangular multifunctional rainwater pump station along the lake according to claim 2 is characterized in that: In step three, the shelf groove (27) and the back rib (28) are arranged on the outer template (5).

4. The method for constructing a super-deep rectangular multifunctional rainwater pump station along a lake according to claim 1 is characterized in that: In step three, an anchor block (29) is provided on the outside of the template (4), and a brace rod (30) is installed using the anchor block (29) on the outside of the template (4), and multiple layers of brace rods (30) are installed between the outer templates (4) of adjacent caisson walls; the lower end of the anchor block (29) is used as a fixed fulcrum, and a first safety net (32) is installed and hung on the fixed fulcrum through a connecting bolt (31), and the first safety net (32) is hung between adjacent walls of the caisson in different areas, and the first safety net (32) and the second safety net (33) together constitute an anti-fall system.

5. The method for constructing a super-deep rectangular multifunctional rainwater pump station along the lake according to claim 1 is characterized in that: In step three, the diagonal brace (38) includes a first diagonal brace (21), a second diagonal brace (22) and a third diagonal brace (23), the bottoms of the first diagonal brace (21) and the second diagonal brace (22) are provided with a concrete pier (20), and the third diagonal brace (23) is fixed on the inner side of the concrete pier (20).

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