CN217761019U - A do not have internal stay pin-connected panel steel form structure for small cross section diversion tunnel - Google Patents
A do not have internal stay pin-connected panel steel form structure for small cross section diversion tunnel Download PDFInfo
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- CN217761019U CN217761019U CN202221857856.7U CN202221857856U CN217761019U CN 217761019 U CN217761019 U CN 217761019U CN 202221857856 U CN202221857856 U CN 202221857856U CN 217761019 U CN217761019 U CN 217761019U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
A non-internal-support assembled steel template structure for a small-section diversion tunnel is disclosed, wherein a steel template consists of a first template section, two second template sections, two third template sections, two fourth template sections and a fifth template section; the first template section, the second template section, the third template section, the fourth template section and the fifth template section are all arc plates, longitudinal ribs and transverse ribs are arranged on the inner circular surface of the template sections, bolt holes are formed in the longitudinal ribs and the transverse ribs on the edges of the template, and adjacent template sections are connected and fixed through bolts matched with the bolt holes. This novel patent adopts above-mentioned structure, provides a steel mould system that does not have interior bearing structure, the nimble spelling in scene, dismantlement to changed needle beam formula steel mould platform truck or steel arch truss combination steel mould system's atress principle, will "plate girder formula atress" change into "plate rib formula atress", with low costs, efficient mode, realized that small cross section diversion tunnel lining concrete form need not the purpose of interior support construction.
Description
Technical Field
The utility model relates to a small cross section diversion tunnel template construction technical field, specific is a no internal stay pin-connected panel steel form structure and construction method for small cross section diversion tunnel.
Background
The excavation cross-sectional area of diversion tunnel of hydraulic and hydroelectric engineering compares engineering tunnel sections such as railway, highway, municipal administration all will be little, and diversion tunnel accounts for than being fairly big in small section, extra small section and below in diversion tunnel of hydraulic and hydroelectric engineering moreover. Taking 1-mark residual project of water delivery tunnel and flood discharge project of a certain reservoir as an example, the length of the project tunnel is 1500m, and the total concrete amount is 4018m 3 The thickness of the concrete lining is 30-50 cm, the clearance diameter after lining is 1.8m, the excavation diameter of the tunnel is only 2.1-2.3m, and the excavation area is 3.46-4.15m 2 It belongs to a tunnel with an ultra-small section. The project cannot be constructed in the flood season due to the influence of the water level of the reservoir, the effective construction time is one dry season, the construction period is shortened, the hole diameter is small, the length of a tunnel line is shortened, only one outlet is arranged on a working surface, the transportation of construction materials is difficult, the site construction conditions are complex, and the like.
At present, the lining construction of domestic water conservancy and hydropower diversion tunnels is generally implemented by two schemes of full-hydraulic automatic walking needle beam type steel mould trolleys or steel arch truss combined steel mould systems, and the two schemes are suitable for long diversion tunnels with middle section and above and are not suitable for diversion tunnels with special small section, ultra-small section and below.
Disclosure of Invention
The technical problem to be solved by the utility model is to provide a no internal stay pin-connected panel steel mould plate structure and construction method for small cross section diversion tunnel, it is different from needle beam formula steel mould platform truck or steel arch truss combination steel mould system, a no internal stay structure, on-the-spot nimble assembly, the steel mould system of dismantlement is provided, and changed needle beam formula steel mould platform truck or steel arch truss combination steel mould system's atress principle, will "plate beam formula atress" change into "plate rib formula atress", low cost, efficient mode, the template construction purpose of small cross section diversion tunnel has been realized.
In order to solve the technical problem, the novel adopted technical scheme is as follows: a non-internal-support assembled steel template structure for a small-section diversion tunnel is disclosed, wherein the steel template consists of a first template section, two second template sections, two third template sections, two fourth template sections and a fifth template section;
the first template section, the second template section, the third template section, the fourth template section and the fifth template section are all arc plates, longitudinal ribs and transverse ribs are arranged on the inner circular surface of the template sections, bolt holes are formed in the longitudinal ribs and the transverse ribs on the edges of the template, and adjacent template sections are connected and fixed through bolts matched with the bolt holes.
In a preferable scheme, the steel template formed by the first template section, the second template section, the third template section, the fourth template section and the fifth template section is supported by a support anchor rod arranged on the inner wall of the tunnel.
In the preferred scheme, the support anchor rods are arranged around the tunnel, and a plurality of support anchor rods on the same vertical surface are connected through the stiffening stirrups in a welding manner.
In the preferred scheme, the first template section is positioned at the bottom of the steel template, the two second template sections are arranged on two sides of the first template section, the two third template sections are arranged above the two second template sections, the two fourth template sections are arranged above the two third template sections, and the fifth template section is positioned between the upper parts of the two fourth template sections.
In a preferred embodiment, the upper inner edge of the fourth template segment is retracted inwards, and the bottom edges of the two sides of the fifth template segment are expanded outwards and matched with the retracted surface of the fourth template segment.
In the preferred scheme, concrete is poured in an annular area between the steel formwork and the tunnel.
The utility model provides a no internal stay pin-connected panel steel form structure and construction method for small cross section diversion tunnel through adopting above-mentioned structure and method, has following beneficial effect:
(1) The non-internal-bracing assembled steel template structure replaces the existing needle beam type steel template trolley or steel arch truss combined steel template system, and the problem of high template pouring construction difficulty of the small-section diversion tunnel is solved;
(2) Compared with the prior art, the assembled steel formwork structure without the internal support effectively reduces the formwork erection cost, reduces the construction cost on the basis of the whole construction, and improves the economic benefit;
(3) For a steel arch truss combined steel mould system, the assembled steel mould without the internal bracing has the advantages that the overall structure is simpler, the consumed time in the construction process is shorter, and the construction efficiency is effectively improved.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
fig. 1 is a schematic diagram of the structure of the steel form of the present invention.
Fig. 2 is a structural schematic diagram of the novel single steel template.
Fig. 3 is a schematic view of the arrangement structure of the support anchor rod before the novel construction.
Fig. 4 is a cross-sectional view of the novel fig. 3.
Fig. 5 is the installation of this novel reinforcing bar sketch map.
Fig. 6 is a cross-sectional view of the tunnel when the first form segment of the present invention is installed.
Fig. 7 is a cross-sectional view of the tunnel when the second form segment of the present invention is installed.
Fig. 8 is a cross-sectional view of the tunnel when the third form segment of the present invention is installed.
Fig. 9 is a cross-sectional view of the tunnel when the fourth form segment of the present invention is installed.
Fig. 10 is a cross-sectional view of the tunnel with the fifth form segment installed.
Fig. 11 is a schematic view of the novel concrete longitudinal layered casting.
In the figure: the formwork comprises a first formwork section 1, a second formwork section 2, a third formwork section 3, a fourth formwork section 4, a fifth formwork section 5, a longitudinal rib 6, a transverse rib 7, bolt holes 8, a tunnel 9, a support anchor rod 10, formwork sidelines 11, stiffening stirrups 12, a support steel pipe 13, a jacking 14 and a pouring hole 15.
Detailed Description
Example 1:
as shown in fig. 1-2, an assembled steel formwork structure without internal bracing for a small-section diversion tunnel is composed of a first formwork section 1, two second formwork sections 2, two third formwork sections 3, two fourth formwork sections 4 and a fifth formwork section 5;
the first template section 1, the second template section 2, the third template section 3, the fourth template section 4 and the fifth template section 5 are all arc plates, longitudinal ribs 6 and transverse ribs 7 are arranged on the inner circular surfaces of the template sections, bolt holes 8 are arranged on the longitudinal ribs 6 and the transverse ribs 7, and adjacent template sections are connected and fixed through bolts matched with the bolt holes 8.
The steel template is divided into eight blocks, and seven steel plates with the arc length of 780mm and one steel plate with the arc length of 230mm are assembled to form a circle.
The longitudinal length of the single steel template is controlled to be 1500mm, the thickness of the single steel template is controlled to be 8mm, 4 transverse ribs 7 and three longitudinal ribs 6 are adopted, the height of the transverse ribs 7 and the height of the longitudinal ribs 6 are 60mm, and the thickness of the transverse ribs 7 and the thickness of the longitudinal ribs 6 are 8mm.
In a preferred scheme, a steel formwork formed by the first formwork section 1, the second formwork section 2, the third formwork section 3, the fourth formwork section 4 and the fifth formwork section 5 is supported by a support anchor rod 10 arranged on the inner wall of the tunnel 9.
In the preferred scheme, the support anchor rods 10 are arranged around the tunnel 9, and the plurality of support anchor rods 10 on the same vertical surface are connected by welding through stiffening stirrups 12.
In the preferred scheme, the first template section 1 is positioned at the bottom of the steel template, the two second template sections 2 are arranged on two sides of the first template section 1, the two third template sections 3 are arranged above the two second template sections 2, the two fourth template sections 4 are arranged above the two third template sections 3, and the fifth template section 5 is positioned between the upper parts of the two fourth template sections 4.
In a preferred scheme, the upper inner edge of the fourth template segment 4 is retracted inwards, and the bottom edges of the two sides of the fifth template segment 5 are expanded outwards and matched with the retraction surface of the fourth template segment 4.
Due to the circular stress characteristic, the steel template can be smoothly dismantled, special treatment needs to be carried out on the splicing positions of the fourth template section 4 and the fifth template section 5 on the upper portion, the treatment mode is that the transverse ribs of the fourth template section 4 are retracted by 20mm, the transverse ribs of the fifth template section 5 are respectively extended by 20mm towards two sides, and the splicing positions of the fourth template section 4 and the fifth template section 5 form a splayed shape (such as most part is enlarged in figure 1), so that after the bolt is dismantled, the top die can be easily dismantled.
In a preferred scheme, concrete is poured in an annular area between the steel formwork and the tunnel 9.
In this example, a 12m slit is considered as a segment, each segment of steel form is 1.5m long, and 8 segments of steel form are customized. Concrete pouring holes are formed in the top formwork of the fifth formwork section 5, three reserved concrete pouring hole top formworks are customized, and the three reserved concrete pouring hole top formworks are distributed in the front, middle and rear positions of the whole construction section as far as possible during installation.
Example 2:
after the pouring construction is finished, the formwork removal operation is required to be carried out:
because the reinforced concrete lining structure is a circular arch structure, the concrete is mainly pressed under the action of self weight, and the bending moment is very small. Therefore, the time for removing the template can be controlled according to the time for removing the upper semicircular bottom die. The strength grade of the lining concrete is C25, and the semicircular arch structure can not be damaged by the removal of the bottom die as long as the concrete reaches 5MPa through calculation. In general, the time for the concrete to reach 5MPa at an average temperature of 20 ℃ is about 8 to 12 hours, depending on the type of cement used and the admixture used, and if necessary, a concrete early strength agent.
The dismantling sequence is according to the section I → the section II → the section III, the fifth template segment 5 in the section I is firstly dismantled, and the fifth template segment 5 in the section II is dismantled after the whole section I is dismantled.
Taking actual construction as an example, the following effects are achieved during construction:
1. according to the comparison calculation of taking one lining section per 12m as a lining section, inner supports are required to be arranged at the interval of 1.5m in the steel arch truss combined steel mould system, the inner supports are generally in a shape of Chinese character mi, and the inner supports are composed of 4 phi 48 multiplied by 3.5 steel pipes with the length of 1.5m and 1 adjustable supporting support with the length of 50 cm. Therefore, 4 × 1.5 × 9 × 3.841 (specific gravity) =207.41kg per section of 12m steel pipe, and 4 × 2 × 9 × 5kg of upper and lower adjustable support is =360kg. And the total length of the lining is 1500m, and then the supporting steel pipe is 1500 ÷ 12 × (207.41 + 360) ÷ 1000=70.9t.
By adopting the construction method, the steel support installation amount and the transportation amount are saved by 70.9t.
2. The lining of the steel mould system without the inner support can be finished by 12m within 1 day, the steel arch truss combined steel mould system generally needs 3 days to finish 24m, and the lining of the steel arch truss combined steel mould system can be finished by 8m within 1 day on average.
Compared with the prior art, the construction method can save 1500/24 multiplied by 3-1500/12 =62.5 days of construction period
The successful practice of the project proves that the construction method has no inner support, the installation workload of the inner support is reduced, the construction time is saved, the construction progress is accelerated, the construction period is shortened, and better economic benefit is generated.
Claims (6)
1. The utility model provides a do not have internal stay pin-connected panel steel form plate structure for small cross section diversion tunnel, its characterized in that: the steel template consists of a first template section (1), two second template sections (2), two third template sections (3), two fourth template sections (4) and a fifth template section (5);
the novel die plate is characterized in that the first die plate segment (1), the second die plate segment (2), the third die plate segment (3), the fourth die plate segment (4) and the fifth die plate segment (5) are arc plates, longitudinal ribs (6) and transverse ribs (7) are arranged on the inner circular surface of the die plate segments, bolt holes (8) are formed in the longitudinal ribs (6) and the transverse ribs (7), and adjacent die plate segments are fixedly connected through bolt matching bolt holes (8).
2. The assembled steel formwork structure without the inner support for the small-section diversion tunnel according to claim 1, which is characterized in that: the steel template formed by the first template section (1), the second template section (2), the third template section (3), the fourth template section (4) and the fifth template section (5) is supported by a support anchor rod (10) arranged on the inner wall of the tunnel (9).
3. The assembled steel formwork structure without the inner support for the small-section diversion tunnel according to claim 2, wherein the assembled steel formwork structure comprises: the supporting anchor rods (10) are arranged around the tunnel (9), and the plurality of supporting anchor rods (10) on the same vertical surface are connected through stiffening stirrups (12) in a welding mode.
4. The assembled steel formwork structure without the internal support for the small-section diversion tunnel according to claim 1, wherein the assembled steel formwork structure without the internal support comprises: first template section (1) be located the steel form bottom, two second template sections (2) set up in first template section (1) both sides, two third template sections (3) set up in two second template sections (2) tops, two fourth template sections (4) set up in two third template sections (3) tops, fifth template section (5) are located between two fourth template sections (4) upper portions.
5. The assembled steel formwork structure without the internal support for the small-section diversion tunnel according to claim 4, wherein the assembled steel formwork structure without the internal support comprises: the upper inner edge of the fourth template segment (4) retracts inwards, and the bottom edges of the two sides of the fifth template segment (5) expand outwards and are matched with the retracting surface of the fourth template segment (4).
6. The assembled steel formwork structure without the inner support for the small-section diversion tunnel according to claim 1, which is characterized in that: and concrete is poured in an annular area between the steel template and the tunnel (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221857856.7U CN217761019U (en) | 2022-07-19 | 2022-07-19 | A do not have internal stay pin-connected panel steel form structure for small cross section diversion tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221857856.7U CN217761019U (en) | 2022-07-19 | 2022-07-19 | A do not have internal stay pin-connected panel steel form structure for small cross section diversion tunnel |
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| Publication Number | Publication Date |
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| CN217761019U true CN217761019U (en) | 2022-11-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221857856.7U Active CN217761019U (en) | 2022-07-19 | 2022-07-19 | A do not have internal stay pin-connected panel steel form structure for small cross section diversion tunnel |
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| Country | Link |
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| CN (1) | CN217761019U (en) |
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2022
- 2022-07-19 CN CN202221857856.7U patent/CN217761019U/en active Active
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